logger/slog: fix race condigtion with Enabled and Level

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.gitea/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,18 @@
+---
+name: Bug report
+about: For reporting bugs in micro
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+
+1. What are you trying to do?
+2. What did you expect to happen?
+3. What happens instead?
+
+**How to reproduce the bug:**
+
+If possible, please include a minimal code snippet here.

.gitea/ISSUE_TEMPLATE/feature-request---enhancement.md

@@ -0,0 +1,17 @@
+---
+name: Feature request / Enhancement
+about: If you have a need not served by micro
+title: "[FEATURE]"
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.gitea/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,8 @@
+---
+name: Question
+about: Ask a question about micro
+title: ''
+labels: ''
+assignees: ''
+
+---

.gitea/autoapprove.yml

@@ -0,0 +1,28 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        run: [ "curl -o tea https://dl.gitea.com/tea/main/tea-main-linux-amd64",
+               "chmod +x ./tea",
+               "./tea login add --name unistack --token ${{ secrets.GITHUB_TOKEN }} --url https://git.unistack.org",
+               "./tea pr --repo ${{ github.event.repository.name }}"
+        ]
+        if: github.actor == 'vtolstov'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.gitea/workflows/lint.yml

@@ -0,0 +1,24 @@
+name: lint
+on:
+  pull_request:
+    branches:
+    - master
+    - v3
+jobs:
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+    - name: setup-go
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.21
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: deps
+      run: go get -v -d ./...
+    - name: lint
+      uses: https://github.com/golangci/golangci-lint-action@v3.4.0
+      continue-on-error: true
+      with:
+        version: v1.52

.gitea/workflows/pr.yml

@@ -0,0 +1,23 @@
+name: pr
+on:
+  pull_request:
+    branches:
+    - master
+    - v3
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: setup-go
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.21
+    - name: deps
+      run: go get -v -t -d ./...
+    - name: test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...

.github.old/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,9 @@
+## Pull Request template
+Please, go through these steps before clicking submit on this PR.
+
+1. Give a descriptive title to your PR.
+2. Provide a description of your changes.
+3. Make sure you have some relevant tests.
+4. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if applicable).
+
+**PLEASE REMOVE THIS TEMPLATE BEFORE SUBMITTING**

.github.old/workflows/autoapprove.yml

@@ -0,0 +1,24 @@
+name: "autoapprove"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+  workflow_run:
+    workflows: ["prbuild"]
+    types:
+      - completed
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  autoapprove:
+    runs-on: ubuntu-latest
+    steps:
+      - name: approve
+        uses: hmarr/auto-approve-action@v3
+        if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github.old/workflows/automerge.yml

@@ -0,0 +1,21 @@
+name: "automerge"
+
+on:
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.actor == 'vtolstov'
+    steps:
+      - name: merge
+        id: merge
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.github.old/workflows/build.yml

@@ -10,51 +10,35 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
+    - name: checkout
+      uses: actions/checkout@v3
     - name: cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
         restore-keys: ${{ runner.os }}-go-
-    - name: sdk checkout
+    - name: deps
-      uses: actions/checkout@v2
-    - name: sdk deps
       run: go get -v -t -d ./...
-    - name: sdk test
+    - name: test
       env:
         INTEGRATION_TESTS: yes
       run: go test -mod readonly -v ./...
-    - name: tests checkout
-      uses: actions/checkout@v2
-      with:
-        repository: unistack-org/micro-tests
-        ref: refs/heads/master
-        path: micro-tests
-        fetch-depth: 1
-    - name: tests deps
-      run: |
-        cd micro-tests
-        go mod edit -replace="github.com/unistack-org/micro/v3=../"
-        go get -v -t -d ./...
-    - name: tests test
-      env:
-        INTEGRATION_TESTS: yes
-      run: cd micro-tests && go test -mod readonly -v ./...
   lint:
     name: lint
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.39
+          version: v1.30
           # Optional: working directory, useful for monorepos
           # working-directory: somedir
           # Optional: golangci-lint command line arguments.

.github.old/workflows/codecov.yml

@@ -0,0 +1,39 @@
+name: "codecov"
+
+on:
+  workflow_run:
+    workflows: ["build"]
+    types:
+      - completed
+  push:
+    branches: [ v3 ]
+  pull_request:
+    branches: [ v3 ]
+  schedule:
+    - cron: '34 1 * * 0'
+
+jobs:
+  codecov:
+    name: codecov
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+
+    steps:
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: setup
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.17
+    - name: Run coverage
+      run: go test -v -race -coverprofile=coverage.out -covermode=atomic ./...
+    - name: codecov
+      uses: codecov/codecov-action@v3.1.1

.github.old/workflows/codeql-analysis.yml

@@ -43,14 +43,14 @@ jobs:
 
     steps:
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: setup
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.17
     # Initializes the CodeQL tools for scanning.
     - name: init
-      uses: github/codeql-action/init@v1
+      uses: github/codeql-action/init@v2
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -61,7 +61,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: autobuild
-      uses: github/codeql-action/autobuild@v1
+      uses: github/codeql-action/autobuild@v2
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -75,4 +75,4 @@ jobs:
     #   make release
 
     - name: analyze
-      uses: github/codeql-action/analyze@v1
+      uses: github/codeql-action/analyze@v2

.github.old/workflows/dependabot-automerge.yml

@@ -1,4 +1,4 @@
-name: "prautomerge"
+name: "dependabot-automerge"
 
 on:
   pull_request_target:
@@ -9,21 +9,17 @@ permissions:
   contents: write
 
 jobs:
-  dependabot:
+  automerge:
     runs-on: ubuntu-latest
-    if: ${{ github.actor == 'dependabot[bot]' }}
+    if: github.actor == 'dependabot[bot]'
     steps:
       - name: metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v1.1.1
+        uses: dependabot/fetch-metadata@v1.3.6
         with:
           github-token: "${{ secrets.TOKEN }}"
-      - name: approve
-        run: gh pr review --approve "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.TOKEN}}
       - name: merge
+        id: merge
         if: ${{contains(steps.metadata.outputs.dependency-names, 'go.unistack.org')}}
         run: gh pr merge --auto --merge "$PR_URL"
         env:

.github.old/workflows/pr.yml

@@ -0,0 +1,40 @@
+name: prbuild
+on:
+  pull_request:
+    branches:
+    - master
+    - v3
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+    - name: setup
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.17
+    - name: checkout
+      uses: actions/checkout@v3
+    - name: cache
+      uses: actions/cache@v3
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: ${{ runner.os }}-go-
+    - name: deps
+      run: go get -v -t -d ./...
+    - name: test
+      env:
+        INTEGRATION_TESTS: yes
+      run: go test -mod readonly -v ./...
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3
+      - name: lint
+        uses: golangci/golangci-lint-action@v3.4.0
+        continue-on-error: true
+        with:
+          version: v1.30

.github/workflows/pr.yml

@@ -1,63 +0,0 @@
-name: prbuild
-on:
-  pull_request:
-    branches:
-    - master
-    - v3
-jobs:
-  test:
-    name: test
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.16
-    - name: cache
-      uses: actions/cache@v2
-      with:
-        path: ~/go/pkg
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - name: sdk checkout
-      uses: actions/checkout@v2
-    - name: sdk deps
-      run: go get -v -t -d ./...
-    - name: sdk test
-      env:
-        INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
-    - name: tests checkout
-      uses: actions/checkout@v2
-      with:
-        repository: unistack-org/micro-tests
-        ref: refs/heads/master
-        path: micro-tests
-        fetch-depth: 1
-    - name: tests deps
-      run: |
-        cd micro-tests
-        go mod edit -replace="github.com/unistack-org/micro/v3=../"
-        go get -v -t -d ./...
-    - name: tests test
-      env:
-        INTEGRATION_TESTS: yes
-      run: cd micro-tests && go test -mod readonly -v ./...
-  lint:
-    name: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout
-        uses: actions/checkout@v2
-      - name: lint
-        uses: golangci/golangci-lint-action@v2
-        continue-on-error: true
-        with:
-          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.39
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true

.gitignore

@@ -1,6 +1,8 @@
 # Develop tools
 /.vscode/
 /.idea/
+.idea
+.vscode
 
 # Binaries for programs and plugins
 *.exe
@@ -13,6 +15,7 @@
 _obj
 _test
 _build
+.DS_Store
 
 # Architecture specific extensions/prefixes
 *.[568vq]

README.md

@@ -1,4 +1,4 @@
-# Micro [![License](https://img.shields.io/:license-apache-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![Doc](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=flat-square)](https://pkg.go.dev/github.com/unistack-org/micro/v3?tab=overview) [![Status](https://github.com/unistack-org/micro/workflows/build/badge.svg?branch=master)](https://github.com/unistack-org/micro/actions?query=workflow%3Abuild+branch%3Amaster+event%3Apush) [![Lint](https://goreportcard.com/badge/github.com/unistack-org/micro)](https://goreportcard.com/report/github.com/unistack-org/micro) [![Slack](https://img.shields.io/static/v1?label=micro&message=slack&color=blueviolet)](https://unistack-org.slack.com/messages/default)
+# Micro [![License](https://img.shields.io/:license-apache-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![Doc](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=flat-square)](https://pkg.go.dev/github.com/unistack-org/micro/v3?tab=overview) [![Status](https://github.com/unistack-org/micro/workflows/build/badge.svg?branch=master)](https://github.com/unistack-org/micro/actions?query=workflow%3Abuild+branch%3Amaster+event%3Apush) [![Lint](https://goreportcard.com/badge/go.unistack.org/micro/v3)](https://goreportcard.com/report/go.unistack.org/micro/v3) [![Coverage](https://codecov.io/gh/unistack-org/micro/branch/v3/graph/badge.svg?token=OZPO2LP7VS)](https://codecov.io/gh/unistack-org/micro)
 
 Micro is a standard library for microservices.
 

api/api.go

@@ -1,182 +0,0 @@
-package api // import "go.unistack.org/micro/v3/api"
-
-import (
-	"errors"
-	"regexp"
-	"strings"
-
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/register"
-	"go.unistack.org/micro/v3/server"
-)
-
-// nolint: revive
-// Api interface
-type Api interface {
-	// Initialise options
-	Init(...Option) error
-	// Get the options
-	Options() Options
-	// Register a http handler
-	Register(*Endpoint) error
-	// Register a route
-	Deregister(*Endpoint) error
-	// Implementation of api
-	String() string
-}
-
-// Options holds the options
-type Options struct{}
-
-// Option func signature
-type Option func(*Options) error
-
-// Endpoint is a mapping between an RPC method and HTTP endpoint
-type Endpoint struct {
-	// Name Greeter.Hello
-	Name string
-	// Desciption for endpoint
-	Description string
-	// Handler e.g rpc, proxy
-	Handler string
-	// Body destination
-	// "*" or "" - top level message value
-	// "string" - inner message value
-	Body string
-	// Host e.g example.com
-	Host []string
-	// Method e.g GET, POST
-	Method []string
-	// Path e.g /greeter. Expect POSIX regex
-	Path []string
-	// Stream flag
-	Stream bool
-}
-
-// Service represents an API service
-type Service struct {
-	// Name of service
-	Name string
-	// Endpoint for this service
-	Endpoint *Endpoint
-	// Services that provides service
-	Services []*register.Service
-}
-
-// Encode encodes an endpoint to endpoint metadata
-func Encode(e *Endpoint) map[string]string {
-	if e == nil {
-		return nil
-	}
-
-	// endpoint map
-	ep := make(map[string]string)
-
-	// set vals only if they exist
-	set := func(k, v string) {
-		if len(v) == 0 {
-			return
-		}
-		ep[k] = v
-	}
-
-	set("endpoint", e.Name)
-	set("description", e.Description)
-	set("handler", e.Handler)
-	set("method", strings.Join(e.Method, ","))
-	set("path", strings.Join(e.Path, ","))
-	set("host", strings.Join(e.Host, ","))
-	set("body", e.Body)
-
-	return ep
-}
-
-// Decode decodes endpoint metadata into an endpoint
-func Decode(e metadata.Metadata) *Endpoint {
-	if e == nil {
-		return nil
-	}
-
-	ep := &Endpoint{}
-	ep.Name, _ = e.Get("endpoint")
-	ep.Description, _ = e.Get("description")
-	epmethod, _ := e.Get("method")
-	ep.Method = []string{epmethod}
-	eppath, _ := e.Get("path")
-	ep.Path = []string{eppath}
-	ephost, _ := e.Get("host")
-	ep.Host = []string{ephost}
-	ep.Handler, _ = e.Get("handler")
-	ep.Body, _ = e.Get("body")
-
-	return ep
-}
-
-// Validate validates an endpoint to guarantee it won't blow up when being served
-func Validate(e *Endpoint) error {
-	if e == nil {
-		return errors.New("endpoint is nil")
-	}
-
-	if len(e.Name) == 0 {
-		return errors.New("name required")
-	}
-
-	for _, p := range e.Path {
-		ps := p[0]
-		pe := p[len(p)-1]
-
-		switch {
-		case ps == '^' && pe == '$':
-			if _, err := regexp.CompilePOSIX(p); err != nil {
-				return err
-			}
-		case ps == '^' && pe != '$':
-			return errors.New("invalid path")
-		case ps != '^' && pe == '$':
-			return errors.New("invalid path")
-		}
-	}
-
-	if len(e.Handler) == 0 {
-		return errors.New("invalid handler")
-	}
-
-	return nil
-}
-
-/*
-Design ideas
-
-// Gateway is an api gateway interface
-type Gateway interface {
-	// Register a http handler
-	Handle(pattern string, http.Handler)
-	// Register a route
-	RegisterRoute(r Route)
-	// Init initialises the command line.
-	// It also parses further options.
-	Init(...Option) error
-	// Run the gateway
-	Run() error
-}
-
-// NewGateway returns a new api gateway
-func NewGateway() Gateway {
-	return newGateway()
-}
-*/
-
-// WithEndpoint returns a server.HandlerOption with endpoint metadata set
-//
-// Usage:
-//
-// 	proto.RegisterHandler(service.Server(), new(Handler), api.WithEndpoint(
-//		&api.Endpoint{
-//			Name: "Greeter.Hello",
-//			Path: []string{"/greeter"},
-//		},
-//	))
-func WithEndpoint(e *Endpoint) server.HandlerOption {
-	return server.EndpointMetadata(e.Name, Encode(e))
-}

api/api_test.go

@@ -1,152 +0,0 @@
-package api
-
-import (
-	"strings"
-	"testing"
-)
-
-//nolint:gocyclo
-func TestEncoding(t *testing.T) {
-	testData := []*Endpoint{
-		nil,
-		{
-			Name:        "Foo.Bar",
-			Description: "A test endpoint",
-			Handler:     "meta",
-			Host:        []string{"foo.com"},
-			Method:      []string{"GET"},
-			Path:        []string{"/test"},
-		},
-	}
-
-	compare := func(expect, got []string) bool {
-		// no data to compare, return true
-		if len(expect) == 0 && len(got) == 0 {
-			return true
-		}
-		// no data expected but got some return false
-		if len(expect) == 0 && len(got) > 0 {
-			return false
-		}
-
-		// compare expected with what we got
-		for _, e := range expect {
-			var seen bool
-			for _, g := range got {
-				if e == g {
-					seen = true
-					break
-				}
-			}
-			if !seen {
-				return false
-			}
-		}
-
-		// we're done, return true
-		return true
-	}
-
-	for _, d := range testData {
-		// encode
-		e := Encode(d)
-		// decode
-		de := Decode(e)
-
-		// nil endpoint returns nil
-		if d == nil {
-			if e != nil {
-				t.Fatalf("expected nil got %v", e)
-			}
-			if de != nil {
-				t.Fatalf("expected nil got %v", de)
-			}
-
-			continue
-		}
-
-		// check encoded map
-		name := e["endpoint"]
-		desc := e["description"]
-		method := strings.Split(e["method"], ",")
-		path := strings.Split(e["path"], ",")
-		host := strings.Split(e["host"], ",")
-		handler := e["handler"]
-
-		if name != d.Name {
-			t.Fatalf("expected %v got %v", d.Name, name)
-		}
-		if desc != d.Description {
-			t.Fatalf("expected %v got %v", d.Description, desc)
-		}
-		if handler != d.Handler {
-			t.Fatalf("expected %v got %v", d.Handler, handler)
-		}
-		if ok := compare(d.Method, method); !ok {
-			t.Fatalf("expected %v got %v", d.Method, method)
-		}
-		if ok := compare(d.Path, path); !ok {
-			t.Fatalf("expected %v got %v", d.Path, path)
-		}
-		if ok := compare(d.Host, host); !ok {
-			t.Fatalf("expected %v got %v", d.Host, host)
-		}
-
-		if de.Name != d.Name {
-			t.Fatalf("expected %v got %v", d.Name, de.Name)
-		}
-		if de.Description != d.Description {
-			t.Fatalf("expected %v got %v", d.Description, de.Description)
-		}
-		if de.Handler != d.Handler {
-			t.Fatalf("expected %v got %v", d.Handler, de.Handler)
-		}
-		if ok := compare(d.Method, de.Method); !ok {
-			t.Fatalf("expected %v got %v", d.Method, de.Method)
-		}
-		if ok := compare(d.Path, de.Path); !ok {
-			t.Fatalf("expected %v got %v", d.Path, de.Path)
-		}
-		if ok := compare(d.Host, de.Host); !ok {
-			t.Fatalf("expected %v got %v", d.Host, de.Host)
-		}
-	}
-}
-
-func TestValidate(t *testing.T) {
-	epPcre := &Endpoint{
-		Name:        "Foo.Bar",
-		Description: "A test endpoint",
-		Handler:     "meta",
-		Host:        []string{"foo.com"},
-		Method:      []string{"GET"},
-		Path:        []string{"^/test/?$"},
-	}
-	if err := Validate(epPcre); err != nil {
-		t.Fatal(err)
-	}
-
-	epGpath := &Endpoint{
-		Name:        "Foo.Bar",
-		Description: "A test endpoint",
-		Handler:     "meta",
-		Host:        []string{"foo.com"},
-		Method:      []string{"GET"},
-		Path:        []string{"/test/{id}"},
-	}
-	if err := Validate(epGpath); err != nil {
-		t.Fatal(err)
-	}
-
-	epPcreInvalid := &Endpoint{
-		Name:        "Foo.Bar",
-		Description: "A test endpoint",
-		Handler:     "meta",
-		Host:        []string{"foo.com"},
-		Method:      []string{"GET"},
-		Path:        []string{"/test/?$"},
-	}
-	if err := Validate(epPcreInvalid); err == nil {
-		t.Fatalf("invalid pcre %v", epPcreInvalid.Path[0])
-	}
-}

api/handler/handler.go

@@ -1,14 +0,0 @@
-// Package handler provides http handlers
-package handler // import "go.unistack.org/micro/v3/api/handler"
-
-import (
-	"net/http"
-)
-
-// Handler represents a HTTP handler that manages a request
-type Handler interface {
-	// standard http handler
-	http.Handler
-	// name of handler
-	String() string
-}

api/handler/options.go

@@ -1,70 +0,0 @@
-package handler
-
-import (
-	"go.unistack.org/micro/v3/api/router"
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/logger"
-)
-
-// DefaultMaxRecvSize specifies max recv size for handler
-var DefaultMaxRecvSize int64 = 1024 * 1024 * 100 // 10Mb
-
-// Options struct holds handler options
-type Options struct {
-	Router      router.Router
-	Client      client.Client
-	Logger      logger.Logger
-	Namespace   string
-	MaxRecvSize int64
-}
-
-// Option func signature
-type Option func(o *Options)
-
-// NewOptions creates new options struct and fills it
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Client:      client.DefaultClient,
-		Router:      router.DefaultRouter,
-		Logger:      logger.DefaultLogger,
-		MaxRecvSize: DefaultMaxRecvSize,
-	}
-	for _, o := range opts {
-		o(&options)
-	}
-
-	// set namespace if blank
-	if len(options.Namespace) == 0 {
-		WithNamespace("go.micro.api")(&options)
-	}
-
-	return options
-}
-
-// WithNamespace specifies the namespace for the handler
-func WithNamespace(s string) Option {
-	return func(o *Options) {
-		o.Namespace = s
-	}
-}
-
-// WithRouter specifies a router to be used by the handler
-func WithRouter(r router.Router) Option {
-	return func(o *Options) {
-		o.Router = r
-	}
-}
-
-// WithClient specifies client to be used by the handler
-func WithClient(c client.Client) Option {
-	return func(o *Options) {
-		o.Client = c
-	}
-}
-
-// WithMaxRecvSize specifies max body size
-func WithMaxRecvSize(size int64) Option {
-	return func(o *Options) {
-		o.MaxRecvSize = size
-	}
-}

api/resolver/grpc/grpc.go

@@ -1,47 +0,0 @@
-// Package grpc resolves a grpc service like /greeter.Say/Hello to greeter service
-package grpc // import "go.unistack.org/micro/v3/api/resolver/grpc"
-
-import (
-	"errors"
-	"net/http"
-	"strings"
-
-	"go.unistack.org/micro/v3/api/resolver"
-)
-
-// Resolver struct
-type Resolver struct {
-	opts resolver.Options
-}
-
-// Resolve func to resolve enndpoint
-func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
-	// parse options
-	options := resolver.NewResolveOptions(opts...)
-
-	// /foo.Bar/Service
-	if req.URL.Path == "/" {
-		return nil, errors.New("unknown name")
-	}
-	// [foo.Bar, Service]
-	parts := strings.Split(req.URL.Path[1:], "/")
-	// [foo, Bar]
-	name := strings.Split(parts[0], ".")
-	// foo
-	return &resolver.Endpoint{
-		Name:   strings.Join(name[:len(name)-1], "."),
-		Host:   req.Host,
-		Method: req.Method,
-		Path:   req.URL.Path,
-		Domain: options.Domain,
-	}, nil
-}
-
-func (r *Resolver) String() string {
-	return "grpc"
-}
-
-// NewResolver is used to create new Resolver
-func NewResolver(opts ...resolver.Option) resolver.Resolver {
-	return &Resolver{opts: resolver.NewOptions(opts...)}
-}

api/resolver/host/host.go

@@ -1,35 +0,0 @@
-// Package host resolves using http host
-package host // import "go.unistack.org/micro/v3/api/resolver/host"
-
-import (
-	"net/http"
-
-	"go.unistack.org/micro/v3/api/resolver"
-)
-
-type hostResolver struct {
-	opts resolver.Options
-}
-
-// Resolve endpoint
-func (r *hostResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
-	// parse options
-	options := resolver.NewResolveOptions(opts...)
-
-	return &resolver.Endpoint{
-		Name:   req.Host,
-		Host:   req.Host,
-		Method: req.Method,
-		Path:   req.URL.Path,
-		Domain: options.Domain,
-	}, nil
-}
-
-func (r *hostResolver) String() string {
-	return "host"
-}
-
-// NewResolver creates new host api resolver
-func NewResolver(opts ...resolver.Option) resolver.Resolver {
-	return &hostResolver{opts: resolver.NewOptions(opts...)}
-}

api/resolver/options.go

@@ -1,70 +0,0 @@
-package resolver
-
-import (
-	"context"
-
-	"go.unistack.org/micro/v3/register"
-)
-
-// Options struct
-type Options struct {
-	// Context is for external defined options
-	Context context.Context
-	// Handler name
-	Handler string
-	// ServicePrefix is the prefix
-	ServicePrefix string
-}
-
-// Option func
-type Option func(o *Options)
-
-// WithHandler sets the handler being used
-func WithHandler(h string) Option {
-	return func(o *Options) {
-		o.Handler = h
-	}
-}
-
-// WithServicePrefix sets the ServicePrefix option
-func WithServicePrefix(p string) Option {
-	return func(o *Options) {
-		o.ServicePrefix = p
-	}
-}
-
-// NewOptions returns new initialised options
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Context: context.Background(),
-	}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-// ResolveOptions are used when resolving a request
-type ResolveOptions struct {
-	Domain string
-}
-
-// ResolveOption sets an option
-type ResolveOption func(*ResolveOptions)
-
-// Domain sets the resolve Domain option
-func Domain(n string) ResolveOption {
-	return func(o *ResolveOptions) {
-		o.Domain = n
-	}
-}
-
-// NewResolveOptions returns new initialised resolve options
-func NewResolveOptions(opts ...ResolveOption) ResolveOptions {
-	options := ResolveOptions{Domain: register.DefaultDomain}
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return options
-}

api/resolver/path/path.go

@@ -1,44 +0,0 @@
-// Package path resolves using http path
-package path // import "go.unistack.org/micro/v3/api/resolver/path"
-
-import (
-	"net/http"
-	"strings"
-
-	"go.unistack.org/micro/v3/api/resolver"
-)
-
-// Resolver the path resolver
-type Resolver struct {
-	opts resolver.Options
-}
-
-// Resolve resolves endpoint
-func (r *Resolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
-	// parse options
-	options := resolver.NewResolveOptions(opts...)
-
-	if req.URL.Path == "/" {
-		return nil, resolver.ErrNotFound
-	}
-
-	parts := strings.Split(req.URL.Path[1:], "/")
-
-	return &resolver.Endpoint{
-		Name:   r.opts.ServicePrefix + "." + parts[0],
-		Host:   req.Host,
-		Method: req.Method,
-		Path:   req.URL.Path,
-		Domain: options.Domain,
-	}, nil
-}
-
-// String retruns the string representation
-func (r *Resolver) String() string {
-	return "path"
-}
-
-// NewResolver returns new path resolver
-func NewResolver(opts ...resolver.Option) resolver.Resolver {
-	return &Resolver{opts: resolver.NewOptions(opts...)}
-}

api/resolver/resolver.go

@@ -1,34 +0,0 @@
-// Package resolver resolves a http request to an endpoint
-package resolver // import "go.unistack.org/micro/v3/api/resolver"
-
-import (
-	"errors"
-	"net/http"
-)
-
-var (
-	// ErrNotFound returned when endpoint is not found
-	ErrNotFound = errors.New("not found")
-	// ErrInvalidPath returned on invalid path
-	ErrInvalidPath = errors.New("invalid path")
-)
-
-// Resolver resolves requests to endpoints
-type Resolver interface {
-	Resolve(r *http.Request, opts ...ResolveOption) (*Endpoint, error)
-	String() string
-}
-
-// Endpoint is the endpoint for a http request
-type Endpoint struct {
-	// Endpoint name e.g greeter
-	Name string
-	// HTTP Host e.g example.com
-	Host string
-	// HTTP Methods e.g GET, POST
-	Method string
-	// HTTP Path e.g /greeter.
-	Path string
-	// Domain endpoint exists within
-	Domain string
-}

api/resolver/subdomain/subdomain.go

@@ -1,90 +0,0 @@
-// Package subdomain is a resolver which uses the subdomain to determine the domain to route to. It
-// offloads the endpoint resolution to a child resolver which is provided in New.
-package subdomain // import "go.unistack.org/micro/v3/api/resolver/subdomain"
-
-import (
-	"net"
-	"net/http"
-	"strings"
-
-	"go.unistack.org/micro/v3/api/resolver"
-	"go.unistack.org/micro/v3/logger"
-	"golang.org/x/net/publicsuffix"
-)
-
-// NewResolver creates new subdomain api resolver
-func NewResolver(parent resolver.Resolver, opts ...resolver.Option) resolver.Resolver {
-	options := resolver.NewOptions(opts...)
-	return &subdomainResolver{opts: options, Resolver: parent}
-}
-
-type subdomainResolver struct {
-	resolver.Resolver
-	opts resolver.Options
-}
-
-// Resolve resolve endpoint based on subdomain
-func (r *subdomainResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
-	if dom := r.Domain(req); len(dom) > 0 {
-		opts = append(opts, resolver.Domain(dom))
-	}
-
-	return r.Resolver.Resolve(req, opts...)
-}
-
-// Domain returns domain
-func (r *subdomainResolver) Domain(req *http.Request) string {
-	// determine the host, e.g. foobar.m3o.app
-	host := req.URL.Hostname()
-	if len(host) == 0 {
-		if h, _, err := net.SplitHostPort(req.Host); err == nil {
-			host = h // host does contain a port
-		} else if strings.Contains(err.Error(), "missing port in address") {
-			host = req.Host // host does not contain a port
-		}
-	}
-
-	// check for an ip address
-	if net.ParseIP(host) != nil {
-		return ""
-	}
-
-	// check for dev environment
-	if host == "localhost" || host == "127.0.0.1" {
-		return ""
-	}
-
-	// extract the top level domain plus one (e.g. 'myapp.com')
-	domain, err := publicsuffix.EffectiveTLDPlusOne(host)
-	if err != nil {
-		if logger.V(logger.DebugLevel) {
-			logger.Debug(r.opts.Context, "Unable to extract domain from %v", host)
-		}
-		return ""
-	}
-
-	// there was no subdomain
-	if host == domain {
-		return ""
-	}
-
-	// remove the domain from the host, leaving the subdomain, e.g. "staging.foo.myapp.com" => "staging.foo"
-	subdomain := strings.TrimSuffix(host, "."+domain)
-
-	// ignore the API subdomain
-	if subdomain == "api" {
-		return ""
-	}
-
-	// return the reversed subdomain as the namespace, e.g. "staging.foo" => "foo-staging"
-	comps := strings.Split(subdomain, ".")
-	for i := len(comps)/2 - 1; i >= 0; i-- {
-		opp := len(comps) - 1 - i
-		comps[i], comps[opp] = comps[opp], comps[i]
-	}
-	return strings.Join(comps, "-")
-}
-
-func (r *subdomainResolver) String() string {
-	return "subdomain"
-}

api/resolver/subdomain/subdomain_test.go

@@ -1,73 +0,0 @@
-package subdomain
-
-import (
-	"net/http"
-	"net/url"
-	"testing"
-
-	"go.unistack.org/micro/v3/api/resolver/vpath"
-)
-
-func TestResolve(t *testing.T) {
-	tt := []struct {
-		Name   string
-		Host   string
-		Result string
-	}{
-		{
-			Name:   "Top level domain",
-			Host:   "micro.mu",
-			Result: "micro",
-		},
-		{
-			Name:   "Effective top level domain",
-			Host:   "micro.com.au",
-			Result: "micro",
-		},
-		{
-			Name:   "Subdomain dev",
-			Host:   "dev.micro.mu",
-			Result: "dev",
-		},
-		{
-			Name:   "Subdomain foo",
-			Host:   "foo.micro.mu",
-			Result: "foo",
-		},
-		{
-			Name:   "Multi-level subdomain",
-			Host:   "staging.myapp.m3o.app",
-			Result: "myapp-staging",
-		},
-		{
-			Name:   "Dev host",
-			Host:   "127.0.0.1",
-			Result: "micro",
-		},
-		{
-			Name:   "Localhost",
-			Host:   "localhost",
-			Result: "micro",
-		},
-		{
-			Name:   "IP host",
-			Host:   "81.151.101.146",
-			Result: "micro",
-		},
-	}
-
-	for _, tc := range tt {
-		t.Run(tc.Name, func(t *testing.T) {
-			r := NewResolver(vpath.NewResolver())
-			result, err := r.Resolve(&http.Request{URL: &url.URL{Host: tc.Host, Path: "foo/bar"}})
-			if err != nil {
-				t.Fatal(err)
-			}
-			if result != nil {
-				if tc.Result != result.Domain {
-					t.Fatalf("Expected %v but got %v", tc.Result, result.Domain)
-				}
-			}
-		})
-	}
-}

api/resolver/vpath/vpath.go

@@ -1,75 +0,0 @@
-// Package vpath resolves using http path and recognised versioned urls
-package vpath // import "go.unistack.org/micro/v3/api/resolver/vpath"
-
-import (
-	"errors"
-	"net/http"
-	"regexp"
-	"strings"
-
-	"go.unistack.org/micro/v3/api/resolver"
-)
-
-// NewResolver creates new vpath api resolver
-func NewResolver(opts ...resolver.Option) resolver.Resolver {
-	return &vpathResolver{opts: resolver.NewOptions(opts...)}
-}
-
-type vpathResolver struct {
-	opts resolver.Options
-}
-
-var re = regexp.MustCompile("^v[0-9]+$")
-
-// Resolve endpoint
-func (r *vpathResolver) Resolve(req *http.Request, opts ...resolver.ResolveOption) (*resolver.Endpoint, error) {
-	if req.URL.Path == "/" {
-		return nil, errors.New("unknown name")
-	}
-
-	options := resolver.NewResolveOptions(opts...)
-
-	parts := strings.Split(req.URL.Path[1:], "/")
-	if len(parts) == 1 {
-		return &resolver.Endpoint{
-			Name:   r.withPrefix(parts...),
-			Host:   req.Host,
-			Method: req.Method,
-			Path:   req.URL.Path,
-			Domain: options.Domain,
-		}, nil
-	}
-
-	// /v1/foo
-	if re.MatchString(parts[0]) {
-		return &resolver.Endpoint{
-			Name:   r.withPrefix(parts[0:2]...),
-			Host:   req.Host,
-			Method: req.Method,
-			Path:   req.URL.Path,
-			Domain: options.Domain,
-		}, nil
-	}
-
-	return &resolver.Endpoint{
-		Name:   r.withPrefix(parts[0]),
-		Host:   req.Host,
-		Method: req.Method,
-		Path:   req.URL.Path,
-		Domain: options.Domain,
-	}, nil
-}
-
-func (r *vpathResolver) String() string {
-	return "vpath"
-}
-
-// withPrefix transforms "foo" into "go.micro.api.foo"
-func (r *vpathResolver) withPrefix(parts ...string) string {
-	p := r.opts.ServicePrefix
-	if len(p) > 0 {
-		parts = append([]string{p}, parts...)
-	}
-
-	return strings.Join(parts, ".")
-}

api/router/options.go

@@ -1,75 +0,0 @@
-package router
-
-import (
-	"context"
-
-	"go.unistack.org/micro/v3/api/resolver"
-	"go.unistack.org/micro/v3/api/resolver/vpath"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/register"
-)
-
-// Options holds the options for api router
-type Options struct {
-	// Register for service lookup
-	Register register.Register
-	// Resolver to use
-	Resolver resolver.Resolver
-	// Logger micro logger
-	Logger logger.Logger
-	// Context is for external options
-	Context context.Context
-	// Handler name
-	Handler string
-}
-
-// Option func signature
-type Option func(o *Options)
-
-// NewOptions returns options struct filled by opts
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Context: context.Background(),
-		Handler: "meta",
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	if options.Resolver == nil {
-		options.Resolver = vpath.NewResolver(
-			resolver.WithHandler(options.Handler),
-		)
-	}
-
-	return options
-}
-
-// WithContext sets the context
-func WithContext(ctx context.Context) Option {
-	return func(o *Options) {
-		o.Context = ctx
-	}
-}
-
-// WithHandler sets the handler
-func WithHandler(h string) Option {
-	return func(o *Options) {
-		o.Handler = h
-	}
-}
-
-// WithRegister sets the register
-func WithRegister(r register.Register) Option {
-	return func(o *Options) {
-		o.Register = r
-	}
-}
-
-// WithResolver sets the resolver
-func WithResolver(r resolver.Resolver) Option {
-	return func(o *Options) {
-		o.Resolver = r
-	}
-}

api/router/router.go

@@ -1,31 +0,0 @@
-// Package router provides api service routing
-package router // import "go.unistack.org/micro/v3/api/router"
-
-import (
-	"net/http"
-
-	"go.unistack.org/micro/v3/api"
-)
-
-// DefaultRouter contains default router implementation
-var DefaultRouter Router
-
-// Router is used to determine an endpoint for a request
-type Router interface {
-	// Returns options
-	Options() Options
-	// Init initialize router
-	Init(...Option) error
-	// Stop the router
-	Close() error
-	// Endpoint returns an api.Service endpoint or an error if it does not exist
-	Endpoint(r *http.Request) (*api.Service, error)
-	// Register endpoint in router
-	Register(ep *api.Endpoint) error
-	// Deregister endpoint from router
-	Deregister(ep *api.Endpoint) error
-	// Route returns an api.Service route
-	Route(r *http.Request) (*api.Service, error)
-	// String representation of router
-	String() string
-}

auth/auth.go

@@ -1,141 +0,0 @@
-// Package auth provides authentication and authorization capability
-package auth // import "go.unistack.org/micro/v3/auth"
-
-import (
-	"context"
-	"errors"
-	"time"
-
-	"go.unistack.org/micro/v3/metadata"
-)
-
-const (
-	// BearerScheme used for Authorization header
-	BearerScheme = "Bearer "
-	// ScopePublic is the scope applied to a rule to allow access to the public
-	ScopePublic = ""
-	// ScopeAccount is the scope applied to a rule to limit to users with any valid account
-	ScopeAccount = "*"
-)
-
-var (
-	// DefaultAuth holds default auth implementation
-	DefaultAuth Auth = NewAuth()
-	// ErrInvalidToken is when the token provided is not valid
-	ErrInvalidToken = errors.New("invalid token provided")
-	// ErrForbidden is when a user does not have the necessary scope to access a resource
-	ErrForbidden = errors.New("resource forbidden")
-)
-
-// Auth provides authentication and authorization
-type Auth interface {
-	// Init the auth
-	Init(opts ...Option) error
-	// Options set for auth
-	Options() Options
-	// Generate a new account
-	Generate(id string, opts ...GenerateOption) (*Account, error)
-	// Verify an account has access to a resource using the rules
-	Verify(acc *Account, res *Resource, opts ...VerifyOption) error
-	// Inspect a token
-	Inspect(token string) (*Account, error)
-	// Token generated using refresh token or credentials
-	Token(opts ...TokenOption) (*Token, error)
-	// Grant access to a resource
-	Grant(rule *Rule) error
-	// Revoke access to a resource
-	Revoke(rule *Rule) error
-	// Rules returns all the rules used to verify requests
-	Rules(...RulesOption) ([]*Rule, error)
-	// String returns the name of the implementation
-	String() string
-}
-
-// Account provided by an auth provider
-type Account struct {
-	// Metadata any other associated metadata
-	Metadata metadata.Metadata `json:"metadata"`
-	// ID of the account e.g. email or id
-	ID string `json:"id"`
-	// Type of the account, e.g. service
-	Type string `json:"type"`
-	// Issuer of the account
-	Issuer string `json:"issuer"`
-	// Secret for the account, e.g. the password
-	Secret string `json:"secret"`
-	// Scopes the account has access to
-	Scopes []string `json:"scopes"`
-}
-
-// Token can be short or long lived
-type Token struct {
-	// Time of token creation
-	Created time.Time `json:"created"`
-	// Time of token expiry
-	Expiry time.Time `json:"expiry"`
-	// The token to be used for accessing resources
-	AccessToken string `json:"access_token"`
-	// RefreshToken to be used to generate a new token
-	RefreshToken string `json:"refresh_token"`
-}
-
-// Expired returns a boolean indicating if the token needs to be refreshed
-func (t *Token) Expired() bool {
-	return t.Expiry.Unix() < time.Now().Unix()
-}
-
-// Resource is an entity such as a user or
-type Resource struct {
-	// Name of the resource, e.g. go.micro.service.notes
-	Name string `json:"name"`
-	// Type of resource, e.g. service
-	Type string `json:"type"`
-	// Endpoint resource e.g NotesService.Create
-	Endpoint string `json:"endpoint"`
-}
-
-// Access defines the type of access a rule grants
-type Access int
-
-const (
-	// AccessGranted to a resource
-	AccessGranted Access = iota
-	// AccessDenied to a resource
-	AccessDenied
-)
-
-// Rule is used to verify access to a resource
-type Rule struct {
-	// Resource that rule belongs to
-	Resource *Resource
-	// ID of the rule
-	ID string
-	// Scope of the rule
-	Scope string
-	// Access flag allow/deny
-	Access Access
-	// Priority holds the rule priority
-	Priority int32
-}
-
-type accountKey struct{}
-
-// AccountFromContext gets the account from the context, which
-// is set by the auth wrapper at the start of a call. If the account
-// is not set, a nil account will be returned. The error is only returned
-// when there was a problem retrieving an account
-func AccountFromContext(ctx context.Context) (*Account, bool) {
-	if ctx == nil {
-		return nil, false
-	}
-	acc, ok := ctx.Value(accountKey{}).(*Account)
-	return acc, ok
-}
-
-// ContextWithAccount sets the account in the context
-func ContextWithAccount(ctx context.Context, account *Account) context.Context {
-	if ctx == nil {
-		ctx = context.Background()
-	}
-	return context.WithValue(ctx, accountKey{}, account)
-}

auth/noop.go

@@ -1,79 +0,0 @@
-package auth
-
-import (
-	"go.unistack.org/micro/v3/util/id"
-)
-
-type noopAuth struct {
-	opts Options
-}
-
-// String returns the name of the implementation
-func (n *noopAuth) String() string {
-	return "noop"
-}
-
-// Init the auth
-func (n *noopAuth) Init(opts ...Option) error {
-	for _, o := range opts {
-		o(&n.opts)
-	}
-	return nil
-}
-
-// Options set for auth
-func (n *noopAuth) Options() Options {
-	return n.opts
-}
-
-// Generate a new account
-func (n *noopAuth) Generate(id string, opts ...GenerateOption) (*Account, error) {
-	options := NewGenerateOptions(opts...)
-
-	return &Account{
-		ID:       id,
-		Secret:   options.Secret,
-		Metadata: options.Metadata,
-		Scopes:   options.Scopes,
-		Issuer:   n.Options().Issuer,
-	}, nil
-}
-
-// Grant access to a resource
-func (n *noopAuth) Grant(rule *Rule) error {
-	return nil
-}
-
-// Revoke access to a resource
-func (n *noopAuth) Revoke(rule *Rule) error {
-	return nil
-}
-
-// Rules used to verify requests
-func (n *noopAuth) Rules(opts ...RulesOption) ([]*Rule, error) {
-	return []*Rule{}, nil
-}
-
-// Verify an account has access to a resource
-func (n *noopAuth) Verify(acc *Account, res *Resource, opts ...VerifyOption) error {
-	return nil
-}
-
-// Inspect a token
-func (n *noopAuth) Inspect(token string) (*Account, error) {
-	id, err := id.New()
-	if err != nil {
-		return nil, err
-	}
-	return &Account{ID: id, Issuer: n.Options().Issuer}, nil
-}
-
-// Token generation using an account id and secret
-func (n *noopAuth) Token(opts ...TokenOption) (*Token, error) {
-	return &Token{}, nil
-}
-
-// NewAuth returns new noop auth
-func NewAuth(opts ...Option) Auth {
-	return &noopAuth{opts: NewOptions(opts...)}
-}

auth/options.go

@@ -1,311 +0,0 @@
-package auth
-
-import (
-	"context"
-	"time"
-
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/store"
-	"go.unistack.org/micro/v3/tracer"
-)
-
-// NewOptions creates Options struct from slice of options
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Tracer: tracer.DefaultTracer,
-		Logger: logger.DefaultLogger,
-		Meter:  meter.DefaultMeter,
-	}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-// Options struct holds auth options
-type Options struct {
-	// Context holds the external options
-	Context context.Context
-	// Meter used for metrics
-	Meter meter.Meter
-	// Logger used for logging
-	Logger logger.Logger
-	// Tracer used for tracing
-	Tracer tracer.Tracer
-	// Store used for stre data
-	Store store.Store
-	// Token is the services token used to authenticate itself
-	Token *Token
-	// LoginURL is the relative url path where a user can login
-	LoginURL string
-	// PrivateKey for encoding JWTs
-	PrivateKey string
-	// PublicKey for decoding JWTs
-	PublicKey string
-	// Secret is used to authenticate the service
-	Secret string
-	// ID is the services auth ID
-	ID string
-	// Issuer of the service's account
-	Issuer string
-	// Name holds the auth name
-	Name string
-	// Addrs sets the addresses of auth
-	Addrs []string
-}
-
-// Option func
-type Option func(o *Options)
-
-// Addrs is the auth addresses to use
-func Addrs(addrs ...string) Option {
-	return func(o *Options) {
-		o.Addrs = addrs
-	}
-}
-
-// Name sets the name
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
-	}
-}
-
-// Issuer of the services account
-func Issuer(i string) Option {
-	return func(o *Options) {
-		o.Issuer = i
-	}
-}
-
-// Store to back auth
-func Store(s store.Store) Option {
-	return func(o *Options) {
-		o.Store = s
-	}
-}
-
-// PublicKey is the JWT public key
-func PublicKey(key string) Option {
-	return func(o *Options) {
-		o.PublicKey = key
-	}
-}
-
-// PrivateKey is the JWT private key
-func PrivateKey(key string) Option {
-	return func(o *Options) {
-		o.PrivateKey = key
-	}
-}
-
-// Credentials sets the auth credentials
-func Credentials(id, secret string) Option {
-	return func(o *Options) {
-		o.ID = id
-		o.Secret = secret
-	}
-}
-
-// ClientToken sets the auth token to use when making requests
-func ClientToken(token *Token) Option {
-	return func(o *Options) {
-		o.Token = token
-	}
-}
-
-// LoginURL sets the auth LoginURL
-func LoginURL(url string) Option {
-	return func(o *Options) {
-		o.LoginURL = url
-	}
-}
-
-// GenerateOptions struct
-type GenerateOptions struct {
-	Metadata metadata.Metadata
-	Provider string
-	Type     string
-	Secret   string
-	Issuer   string
-	Scopes   []string
-}
-
-// GenerateOption func
-type GenerateOption func(o *GenerateOptions)
-
-// WithSecret for the generated account
-func WithSecret(s string) GenerateOption {
-	return func(o *GenerateOptions) {
-		o.Secret = s
-	}
-}
-
-// WithType for the generated account
-func WithType(t string) GenerateOption {
-	return func(o *GenerateOptions) {
-		o.Type = t
-	}
-}
-
-// WithMetadata for the generated account
-func WithMetadata(md metadata.Metadata) GenerateOption {
-	return func(o *GenerateOptions) {
-		o.Metadata = metadata.Copy(md)
-	}
-}
-
-// WithProvider for the generated account
-func WithProvider(p string) GenerateOption {
-	return func(o *GenerateOptions) {
-		o.Provider = p
-	}
-}
-
-// WithScopes for the generated account
-func WithScopes(s ...string) GenerateOption {
-	return func(o *GenerateOptions) {
-		o.Scopes = s
-	}
-}
-
-// WithIssuer for the generated account
-func WithIssuer(i string) GenerateOption {
-	return func(o *GenerateOptions) {
-		o.Issuer = i
-	}
-}
-
-// NewGenerateOptions from a slice of options
-func NewGenerateOptions(opts ...GenerateOption) GenerateOptions {
-	var options GenerateOptions
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-// TokenOptions struct
-type TokenOptions struct {
-	ID           string
-	Secret       string
-	RefreshToken string
-	Issuer       string
-	Expiry       time.Duration
-}
-
-// TokenOption func
-type TokenOption func(o *TokenOptions)
-
-// WithExpiry for the token
-func WithExpiry(ex time.Duration) TokenOption {
-	return func(o *TokenOptions) {
-		o.Expiry = ex
-	}
-}
-
-// WithCredentials sets tye id and secret
-func WithCredentials(id, secret string) TokenOption {
-	return func(o *TokenOptions) {
-		o.ID = id
-		o.Secret = secret
-	}
-}
-
-// WithToken sets the refresh token
-func WithToken(rt string) TokenOption {
-	return func(o *TokenOptions) {
-		o.RefreshToken = rt
-	}
-}
-
-// WithTokenIssuer sets the token issuer option
-func WithTokenIssuer(iss string) TokenOption {
-	return func(o *TokenOptions) {
-		o.Issuer = iss
-	}
-}
-
-// NewTokenOptions from a slice of options
-func NewTokenOptions(opts ...TokenOption) TokenOptions {
-	var options TokenOptions
-	for _, o := range opts {
-		o(&options)
-	}
-
-	// set default expiry of token
-	if options.Expiry == 0 {
-		options.Expiry = time.Minute
-	}
-
-	return options
-}
-
-// VerifyOptions struct
-type VerifyOptions struct {
-	Context   context.Context
-	Namespace string
-}
-
-// VerifyOption func
-type VerifyOption func(o *VerifyOptions)
-
-// VerifyContext pass context to verify
-func VerifyContext(ctx context.Context) VerifyOption {
-	return func(o *VerifyOptions) {
-		o.Context = ctx
-	}
-}
-
-// VerifyNamespace sets thhe namespace for verify
-func VerifyNamespace(ns string) VerifyOption {
-	return func(o *VerifyOptions) {
-		o.Namespace = ns
-	}
-}
-
-// RulesOptions struct
-type RulesOptions struct {
-	Context   context.Context
-	Namespace string
-}
-
-// RulesOption func
-type RulesOption func(o *RulesOptions)
-
-// RulesContext pass rules context
-func RulesContext(ctx context.Context) RulesOption {
-	return func(o *RulesOptions) {
-		o.Context = ctx
-	}
-}
-
-// RulesNamespace sets the rule namespace
-func RulesNamespace(ns string) RulesOption {
-	return func(o *RulesOptions) {
-		o.Namespace = ns
-	}
-}
-
-// Logger sets the logger
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
-// Meter sets the meter
-func Meter(m meter.Meter) Option {
-	return func(o *Options) {
-		o.Meter = m
-	}
-}
-
-// Tracer sets the meter
-func Tracer(t tracer.Tracer) Option {
-	return func(o *Options) {
-		o.Tracer = t
-	}
-}

auth/rules.go

@@ -1,92 +0,0 @@
-package auth
-
-import (
-	"fmt"
-	"sort"
-	"strings"
-)
-
-// VerifyAccess an account has access to a resource using the rules provided. If the account does not have
-// access an error will be returned. If there are no rules provided which match the resource, an error
-// will be returned
-//nolint:gocyclo
-func VerifyAccess(rules []*Rule, acc *Account, res *Resource) error {
-	// the rule is only to be applied if the type matches the resource or is catch-all (*)
-	validTypes := []string{"*", res.Type}
-
-	// the rule is only to be applied if the name matches the resource or is catch-all (*)
-	validNames := []string{"*", res.Name}
-
-	// rules can have wildcard excludes on endpoints since this can also be a path for web services,
-	// e.g. /foo/* would include /foo/bar. We also want to check for wildcards and the exact endpoint
-	validEndpoints := []string{"*", res.Endpoint}
-	if comps := strings.Split(res.Endpoint, "/"); len(comps) > 1 {
-		for i := 1; i < len(comps)+1; i++ {
-			wildcard := fmt.Sprintf("%v/*", strings.Join(comps[0:i], "/"))
-			validEndpoints = append(validEndpoints, wildcard)
-		}
-	}
-
-	// filter the rules to the ones which match the criteria above
-	filteredRules := make([]*Rule, 0)
-	for _, rule := range rules {
-		if !include(validTypes, rule.Resource.Type) {
-			continue
-		}
-		if !include(validNames, rule.Resource.Name) {
-			continue
-		}
-		if !include(validEndpoints, rule.Resource.Endpoint) {
-			continue
-		}
-		filteredRules = append(filteredRules, rule)
-	}
-
-	// sort the filtered rules by priority, highest to lowest
-	sort.SliceStable(filteredRules, func(i, j int) bool {
-		return filteredRules[i].Priority > filteredRules[j].Priority
-	})
-
-	// loop through the rules and check for a rule which applies to this account
-	for _, rule := range filteredRules {
-		// a blank scope indicates the rule applies to everyone, even nil accounts
-		if rule.Scope == ScopePublic && rule.Access == AccessDenied {
-			return ErrForbidden
-		} else if rule.Scope == ScopePublic && rule.Access == AccessGranted {
-			return nil
-		}
-
-		// all further checks require an account
-		if acc == nil {
-			continue
-		}
-
-		// this rule applies to any account
-		if rule.Scope == ScopeAccount && rule.Access == AccessDenied {
-			return ErrForbidden
-		} else if rule.Scope == ScopeAccount && rule.Access == AccessGranted {
-			return nil
-		}
-
-		// if the account has the necessary scope
-		if include(acc.Scopes, rule.Scope) && rule.Access == AccessDenied {
-			return ErrForbidden
-		} else if include(acc.Scopes, rule.Scope) && rule.Access == AccessGranted {
-			return nil
-		}
-	}
-
-	// if no rules matched then return forbidden
-	return ErrForbidden
-}
-
-// include is a helper function which checks to see if the slice contains the value. includes is
-// not case sensitive.
-func include(slice []string, val string) bool {
-	for _, s := range slice {
-		if strings.EqualFold(s, val) {
-			return true
-		}
-	}
-	return false
-}

auth/rules_test.go

@@ -1,288 +0,0 @@
-package auth
-
-import (
-	"testing"
-)
-
-func TestVerify(t *testing.T) {
-	srvResource := &Resource{
-		Type:     "service",
-		Name:     "go.micro.service.foo",
-		Endpoint: "Foo.Bar",
-	}
-
-	webResource := &Resource{
-		Type:     "service",
-		Name:     "go.micro.web.foo",
-		Endpoint: "/foo/bar",
-	}
-
-	catchallResource := &Resource{
-		Type:     "*",
-		Name:     "*",
-		Endpoint: "*",
-	}
-
-	tt := []struct {
-		Error    error
-		Account  *Account
-		Resource *Resource
-		Name     string
-		Rules    []*Rule
-	}{
-		{
-			Name:     "NoRules",
-			Rules:    []*Rule{},
-			Account:  nil,
-			Resource: srvResource,
-			Error:    ErrForbidden,
-		},
-		{
-			Name:     "CatchallPublicAccount",
-			Account:  &Account{},
-			Resource: srvResource,
-			Rules: []*Rule{
-				{
-					Scope:    "",
-					Resource: catchallResource,
-				},
-			},
-		},
-		{
-			Name:     "CatchallPublicNoAccount",
-			Resource: srvResource,
-			Rules: []*Rule{
-				{
-					Scope:    "",
-					Resource: catchallResource,
-				},
-			},
-		},
-		{
-			Name:     "CatchallPrivateAccount",
-			Account:  &Account{},
-			Resource: srvResource,
-			Rules: []*Rule{
-				{
-					Scope:    "*",
-					Resource: catchallResource,
-				},
-			},
-		},
-		{
-			Name:     "CatchallPrivateNoAccount",
-			Resource: srvResource,
-			Rules: []*Rule{
-				{
-					Scope:    "*",
-					Resource: catchallResource,
-				},
-			},
-			Error: ErrForbidden,
-		},
-		{
-			Name:     "CatchallServiceRuleMatch",
-			Resource: srvResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope: "*",
-					Resource: &Resource{
-						Type:     srvResource.Type,
-						Name:     srvResource.Name,
-						Endpoint: "*",
-					},
-				},
-			},
-		},
-		{
-			Name:     "CatchallServiceRuleNoMatch",
-			Resource: srvResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope: "*",
-					Resource: &Resource{
-						Type:     srvResource.Type,
-						Name:     "wrongname",
-						Endpoint: "*",
-					},
-				},
-			},
-			Error: ErrForbidden,
-		},
-		{
-			Name:     "ExactRuleValidScope",
-			Resource: srvResource,
-			Account: &Account{
-				Scopes: []string{"neededscope"},
-			},
-			Rules: []*Rule{
-				{
-					Scope:    "neededscope",
-					Resource: srvResource,
-				},
-			},
-		},
-		{
-			Name:     "ExactRuleInvalidScope",
-			Resource: srvResource,
-			Account: &Account{
-				Scopes: []string{"neededscope"},
-			},
-			Rules: []*Rule{
-				{
-					Scope:    "invalidscope",
-					Resource: srvResource,
-				},
-			},
-			Error: ErrForbidden,
-		},
-		{
-			Name:     "CatchallDenyWithAccount",
-			Resource: srvResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope:    "*",
-					Resource: catchallResource,
-					Access:   AccessDenied,
-				},
-			},
-			Error: ErrForbidden,
-		},
-		{
-			Name:     "CatchallDenyWithNoAccount",
-			Resource: srvResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope:    "*",
-					Resource: catchallResource,
-					Access:   AccessDenied,
-				},
-			},
-			Error: ErrForbidden,
-		},
-		{
-			Name:     "RulePriorityGrantFirst",
-			Resource: srvResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope:    "*",
-					Resource: catchallResource,
-					Access:   AccessGranted,
-					Priority: 1,
-				},
-				{
-					Scope:    "*",
-					Resource: catchallResource,
-					Access:   AccessDenied,
-					Priority: 0,
-				},
-			},
-		},
-		{
-			Name:     "RulePriorityDenyFirst",
-			Resource: srvResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope:    "*",
-					Resource: catchallResource,
-					Access:   AccessGranted,
-					Priority: 0,
-				},
-				{
-					Scope:    "*",
-					Resource: catchallResource,
-					Access:   AccessDenied,
-					Priority: 1,
-				},
-			},
-			Error: ErrForbidden,
-		},
-		{
-			Name:     "WebExactEndpointValid",
-			Resource: webResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope:    "*",
-					Resource: webResource,
-				},
-			},
-		},
-		{
-			Name:     "WebExactEndpointInalid",
-			Resource: webResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope: "*",
-					Resource: &Resource{
-						Type:     webResource.Type,
-						Name:     webResource.Name,
-						Endpoint: "invalidendpoint",
-					},
-				},
-			},
-			Error: ErrForbidden,
-		},
-		{
-			Name:     "WebWildcardEndpoint",
-			Resource: webResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope: "*",
-					Resource: &Resource{
-						Type:     webResource.Type,
-						Name:     webResource.Name,
-						Endpoint: "*",
-					},
-				},
-			},
-		},
-		{
-			Name:     "WebWildcardPathEndpointValid",
-			Resource: webResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope: "*",
-					Resource: &Resource{
-						Type:     webResource.Type,
-						Name:     webResource.Name,
-						Endpoint: "/foo/*",
-					},
-				},
-			},
-		},
-		{
-			Name:     "WebWildcardPathEndpointInvalid",
-			Resource: webResource,
-			Account:  &Account{},
-			Rules: []*Rule{
-				{
-					Scope: "*",
-					Resource: &Resource{
-						Type:     webResource.Type,
-						Name:     webResource.Name,
-						Endpoint: "/bar/*",
-					},
-				},
-			},
-			Error: ErrForbidden,
-		},
-	}
-
-	for _, tc := range tt {
-		t.Run(tc.Name, func(t *testing.T) {
-			if err := VerifyAccess(tc.Rules, tc.Account, tc.Resource); err != tc.Error {
-				t.Errorf("Expected %v but got %v", tc.Error, err)
-			}
-		})
-	}
-}

broker/broker.go

@@ -1,10 +1,12 @@
 // Package broker is an interface used for asynchronous messaging
-package broker // import "go.unistack.org/micro/v3/broker"
+package broker
 
 import (
 	"context"
 	"errors"
+	"time"
 
+	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/metadata"
 )
 
@@ -16,6 +18,8 @@ var (
 	ErrNotConnected = errors.New("broker not connected")
 	// ErrDisconnected returns when broker disconnected
 	ErrDisconnected = errors.New("broker disconnected")
+	// DefaultGracefulTimeout
+	DefaultGracefulTimeout = 5 * time.Second
 )
 
 // Broker is an interface used for asynchronous messaging.
@@ -44,12 +48,24 @@ type Broker interface {
 	String() string
 }
 
+type (
+	FuncPublish        func(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error
+	HookPublish        func(next FuncPublish) FuncPublish
+	FuncBatchPublish   func(ctx context.Context, msgs []*Message, opts ...PublishOption) error
+	HookBatchPublish   func(next FuncBatchPublish) FuncBatchPublish
+	FuncSubscribe      func(ctx context.Context, topic string, h Handler, opts ...SubscribeOption) (Subscriber, error)
+	HookSubscribe      func(next FuncSubscribe) FuncSubscribe
+	FuncBatchSubscribe func(ctx context.Context, topic string, h BatchHandler, opts ...SubscribeOption) (Subscriber, error)
+	HookBatchSubscribe func(next FuncBatchSubscribe) FuncBatchSubscribe
+)
+
 // Handler is used to process messages via a subscription of a topic.
 type Handler func(Event) error
 
 // Events contains multiple events
 type Events []Event
 
+// Ack try to ack all events and return
 func (evs Events) Ack() error {
 	var err error
 	for _, ev := range evs {
@@ -60,6 +76,7 @@ func (evs Events) Ack() error {
 	return nil
 }
 
+// SetError sets error on event
 func (evs Events) SetError(err error) {
 	for _, ev := range evs {
 		ev.SetError(err)
@@ -71,6 +88,8 @@ type BatchHandler func(Events) error
 
 // Event is given to a subscription handler for processing
 type Event interface {
+	// Context return context.Context for event
+	Context() context.Context
 	// Topic returns event topic
 	Topic() string
 	// Message returns broker message
@@ -83,33 +102,12 @@ type Event interface {
 	SetError(err error)
 }
 
-// RawMessage is a raw encoded JSON value.
-// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
-type RawMessage []byte
-
-// MarshalJSON returns m as the JSON encoding of m.
-func (m *RawMessage) MarshalJSON() ([]byte, error) {
-	if m == nil {
-		return []byte("null"), nil
-	}
-	return *m, nil
-}
-
-// UnmarshalJSON sets *m to a copy of data.
-func (m *RawMessage) UnmarshalJSON(data []byte) error {
-	if m == nil {
-		return errors.New("RawMessage UnmarshalJSON on nil pointer")
-	}
-	*m = append((*m)[0:0], data...)
-	return nil
-}
-
 // Message is used to transfer data
 type Message struct {
 	// Header contains message metadata
 	Header metadata.Metadata
 	// Body contains message body
-	Body RawMessage
+	Body codec.RawMessage
 }
 
 // NewMessage create broker message with topic filled

broker/context_test.go

@@ -0,0 +1,72 @@
+package broker
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), brokerKey{}, NewBroker())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestFromNilContext(t *testing.T) {
+	// nolint: staticcheck
+	c, ok := FromContext(nil)
+	if ok || c != nil {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewBroker())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestNewNilContext(t *testing.T) {
+	// nolint: staticcheck
+	ctx := NewContext(nil, NewBroker())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestSetSubscribeOption(t *testing.T) {
+	type key struct{}
+	o := SetSubscribeOption(key{}, "test")
+	opts := &SubscribeOptions{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetSubscribeOption not works")
+	}
+}
+
+func TestSetPublishOption(t *testing.T) {
+	type key struct{}
+	o := SetPublishOption(key{}, "test")
+	opts := &PublishOptions{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetPublishOption not works")
+	}
+}
+
+func TestSetOption(t *testing.T) {
+	type key struct{}
+	o := SetOption(key{}, "test")
+	opts := &Options{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetOption not works")
+	}
+}

broker/memory/memory.go

@@ -4,8 +4,10 @@ import (
 	"context"
 	"sync"
 
+	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/logger"
 	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v3/options"
 	maddr "go.unistack.org/micro/v3/util/addr"
 	"go.unistack.org/micro/v3/util/id"
 	mnet "go.unistack.org/micro/v3/util/net"
@@ -13,9 +15,13 @@ import (
 )
 
 type memoryBroker struct {
+	funcPublish        broker.FuncPublish
+	funcBatchPublish   broker.FuncBatchPublish
+	funcSubscribe      broker.FuncSubscribe
+	funcBatchSubscribe broker.FuncBatchSubscribe
 	subscribers        map[string][]*memorySubscriber
 	addr               string
-	opts        Options
+	opts               broker.Options
 	sync.RWMutex
 	connected bool
 }
@@ -24,20 +30,20 @@ type memoryEvent struct {
 	err     error
 	message interface{}
 	topic   string
-	opts    Options
+	opts    broker.Options
 }
 
 type memorySubscriber struct {
 	ctx          context.Context
 	exit         chan bool
-	handler      Handler
+	handler      broker.Handler
-	batchhandler BatchHandler
+	batchhandler broker.BatchHandler
 	id           string
 	topic        string
-	opts         SubscribeOptions
+	opts         broker.SubscribeOptions
 }
 
-func (m *memoryBroker) Options() Options {
+func (m *memoryBroker) Options() broker.Options {
 	return m.opts
 }
 
@@ -46,6 +52,12 @@ func (m *memoryBroker) Address() string {
 }
 
 func (m *memoryBroker) Connect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+
 	m.Lock()
 	defer m.Unlock()
 
@@ -70,6 +82,12 @@ func (m *memoryBroker) Connect(ctx context.Context) error {
 }
 
 func (m *memoryBroker) Disconnect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+
 	m.Lock()
 	defer m.Unlock()
 
@@ -81,27 +99,54 @@ func (m *memoryBroker) Disconnect(ctx context.Context) error {
 	return nil
 }
 
-func (m *memoryBroker) Init(opts ...Option) error {
+func (m *memoryBroker) Init(opts ...broker.Option) error {
 	for _, o := range opts {
 		o(&m.opts)
 	}
+
+	m.funcPublish = m.fnPublish
+	m.funcBatchPublish = m.fnBatchPublish
+	m.funcSubscribe = m.fnSubscribe
+	m.funcBatchSubscribe = m.fnBatchSubscribe
+
+	m.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case broker.HookPublish:
+			m.funcPublish = h(m.funcPublish)
+		case broker.HookBatchPublish:
+			m.funcBatchPublish = h(m.funcBatchPublish)
+		case broker.HookSubscribe:
+			m.funcSubscribe = h(m.funcSubscribe)
+		case broker.HookBatchSubscribe:
+			m.funcBatchSubscribe = h(m.funcBatchSubscribe)
+		}
+	})
+
 	return nil
 }
 
-func (m *memoryBroker) Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error {
+func (m *memoryBroker) Publish(ctx context.Context, topic string, msg *broker.Message, opts ...broker.PublishOption) error {
-	msg.Header.Set(metadata.HeaderTopic, topic)
+	return m.funcPublish(ctx, topic, msg, opts...)
-	return m.publish(ctx, []*Message{msg}, opts...)
 }
 
-func (m *memoryBroker) BatchPublish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
+func (m *memoryBroker) fnPublish(ctx context.Context, topic string, msg *broker.Message, opts ...broker.PublishOption) error {
+	msg.Header.Set(metadata.HeaderTopic, topic)
+	return m.publish(ctx, []*broker.Message{msg}, opts...)
+}
+
+func (m *memoryBroker) BatchPublish(ctx context.Context, msgs []*broker.Message, opts ...broker.PublishOption) error {
+	return m.funcBatchPublish(ctx, msgs, opts...)
+}
+
+func (m *memoryBroker) fnBatchPublish(ctx context.Context, msgs []*broker.Message, opts ...broker.PublishOption) error {
 	return m.publish(ctx, msgs, opts...)
 }
 
-func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
+func (m *memoryBroker) publish(ctx context.Context, msgs []*broker.Message, opts ...broker.PublishOption) error {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
-		return ErrNotConnected
+		return broker.ErrNotConnected
 	}
 	m.RUnlock()
 
@@ -111,9 +156,9 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 	case <-ctx.Done():
 		return ctx.Err()
 	default:
-		options := NewPublishOptions(opts...)
+		options := broker.NewPublishOptions(opts...)
 
-		msgTopicMap := make(map[string]Events)
+		msgTopicMap := make(map[string]broker.Events)
 		for _, v := range msgs {
 			p := &memoryEvent{opts: m.opts}
 
@@ -161,7 +206,7 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 						}
 					} else if sub.opts.AutoAck {
 						if err = ms.Ack(); err != nil {
-							m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
+							m.opts.Logger.Error(m.opts.Context, "broker ack error", err)
 						}
 					}
 					// single processing
@@ -172,11 +217,11 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 							if eh != nil {
 								_ = eh(p)
 							} else if m.opts.Logger.V(logger.ErrorLevel) {
-								m.opts.Logger.Error(m.opts.Context, err.Error())
+								m.opts.Logger.Error(m.opts.Context, "broker handler error", err)
 							}
 						} else if sub.opts.AutoAck {
 							if err = p.Ack(); err != nil {
-								m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
+								m.opts.Logger.Error(m.opts.Context, "broker ack error", err)
 							}
 						}
 					}
@@ -188,11 +233,15 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 	return nil
 }
 
-func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler BatchHandler, opts ...SubscribeOption) (Subscriber, error) {
+func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler broker.BatchHandler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
+	return m.funcBatchSubscribe(ctx, topic, handler, opts...)
+}
+
+func (m *memoryBroker) fnBatchSubscribe(ctx context.Context, topic string, handler broker.BatchHandler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
-		return nil, ErrNotConnected
+		return nil, broker.ErrNotConnected
 	}
 	m.RUnlock()
 
@@ -201,7 +250,7 @@ func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler
 		return nil, err
 	}
 
-	options := NewSubscribeOptions(opts...)
+	options := broker.NewSubscribeOptions(opts...)
 
 	sub := &memorySubscriber{
 		exit:         make(chan bool, 1),
@@ -233,11 +282,15 @@ func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler
 	return sub, nil
 }
 
-func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
+func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
+	return m.funcSubscribe(ctx, topic, handler, opts...)
+}
+
+func (m *memoryBroker) fnSubscribe(ctx context.Context, topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
-		return nil, ErrNotConnected
+		return nil, broker.ErrNotConnected
 	}
 	m.RUnlock()
 
@@ -246,7 +299,7 @@ func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Hand
 		return nil, err
 	}
 
-	options := NewSubscribeOptions(opts...)
+	options := broker.NewSubscribeOptions(opts...)
 
 	sub := &memorySubscriber{
 		exit:    make(chan bool, 1),
@@ -290,12 +343,12 @@ func (m *memoryEvent) Topic() string {
 	return m.topic
 }
 
-func (m *memoryEvent) Message() *Message {
+func (m *memoryEvent) Message() *broker.Message {
 	switch v := m.message.(type) {
-	case *Message:
+	case *broker.Message:
 		return v
 	case []byte:
-		msg := &Message{}
+		msg := &broker.Message{}
 		if err := m.opts.Codec.Unmarshal(v, msg); err != nil {
 			if m.opts.Logger.V(logger.ErrorLevel) {
 				m.opts.Logger.Error(m.opts.Context, "[memory]: failed to unmarshal: %v", err)
@@ -320,7 +373,11 @@ func (m *memoryEvent) SetError(err error) {
 	m.err = err
 }
 
-func (m *memorySubscriber) Options() SubscribeOptions {
+func (m *memoryEvent) Context() context.Context {
+	return m.opts.Context
+}
+
+func (m *memorySubscriber) Options() broker.SubscribeOptions {
 	return m.opts
 }
 
@@ -334,9 +391,9 @@ func (m *memorySubscriber) Unsubscribe(ctx context.Context) error {
 }
 
 // NewBroker return new memory broker
-func NewBroker(opts ...Option) Broker {
+func NewBroker(opts ...broker.Option) broker.Broker {
 	return &memoryBroker{
-		opts:        NewOptions(opts...),
+		opts:        broker.NewOptions(opts...),
 		subscribers: make(map[string][]*memorySubscriber),
 	}
 }

broker/memory/memory_test.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"testing"
 
+	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/metadata"
 )
 
@@ -12,6 +13,10 @@ func TestMemoryBatchBroker(t *testing.T) {
 	b := NewBroker()
 	ctx := context.Background()
 
+	if err := b.Init(); err != nil {
+		t.Fatalf("Unexpected init error %v", err)
+	}
+
 	if err := b.Connect(ctx); err != nil {
 		t.Fatalf("Unexpected connect error %v", err)
 	}
@@ -19,7 +24,7 @@ func TestMemoryBatchBroker(t *testing.T) {
 	topic := "test"
 	count := 10
 
-	fn := func(evts Events) error {
+	fn := func(evts broker.Events) error {
 		return evts.Ack()
 	}
 
@@ -28,9 +33,9 @@ func TestMemoryBatchBroker(t *testing.T) {
 		t.Fatalf("Unexpected error subscribing %v", err)
 	}
 
-	msgs := make([]*Message, 0, count)
+	msgs := make([]*broker.Message, 0, count)
 	for i := 0; i < count; i++ {
-		message := &Message{
+		message := &broker.Message{
 			Header: map[string]string{
 				metadata.HeaderTopic: topic,
 				"foo":                "bar",
@@ -58,6 +63,10 @@ func TestMemoryBroker(t *testing.T) {
 	b := NewBroker()
 	ctx := context.Background()
 
+	if err := b.Init(); err != nil {
+		t.Fatalf("Unexpected init error %v", err)
+	}
+
 	if err := b.Connect(ctx); err != nil {
 		t.Fatalf("Unexpected connect error %v", err)
 	}
@@ -65,7 +74,7 @@ func TestMemoryBroker(t *testing.T) {
 	topic := "test"
 	count := 10
 
-	fn := func(p Event) error {
+	fn := func(p broker.Event) error {
 		return nil
 	}
 
@@ -74,9 +83,9 @@ func TestMemoryBroker(t *testing.T) {
 		t.Fatalf("Unexpected error subscribing %v", err)
 	}
 
-	msgs := make([]*Message, 0, count)
+	msgs := make([]*broker.Message, 0, count)
 	for i := 0; i < count; i++ {
-		message := &Message{
+		message := &broker.Message{
 			Header: map[string]string{
 				metadata.HeaderTopic: topic,
 				"foo":                "bar",

broker/noop.go

@@ -0,0 +1,128 @@
+package broker
+
+import (
+	"context"
+	"strings"
+
+	"go.unistack.org/micro/v3/options"
+)
+
+type NoopBroker struct {
+	funcPublish        FuncPublish
+	funcBatchPublish   FuncBatchPublish
+	funcSubscribe      FuncSubscribe
+	funcBatchSubscribe FuncBatchSubscribe
+	opts               Options
+}
+
+func NewBroker(opts ...Option) *NoopBroker {
+	b := &NoopBroker{opts: NewOptions(opts...)}
+	b.funcPublish = b.fnPublish
+	b.funcBatchPublish = b.fnBatchPublish
+	b.funcSubscribe = b.fnSubscribe
+	b.funcBatchSubscribe = b.fnBatchSubscribe
+
+	return b
+}
+
+func (b *NoopBroker) Name() string {
+	return b.opts.Name
+}
+
+func (b *NoopBroker) String() string {
+	return "noop"
+}
+
+func (b *NoopBroker) Options() Options {
+	return b.opts
+}
+
+func (b *NoopBroker) Init(opts ...Option) error {
+	for _, opt := range opts {
+		opt(&b.opts)
+	}
+
+	b.funcPublish = b.fnPublish
+	b.funcBatchPublish = b.fnBatchPublish
+	b.funcSubscribe = b.fnSubscribe
+	b.funcBatchSubscribe = b.fnBatchSubscribe
+
+	b.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case HookPublish:
+			b.funcPublish = h(b.funcPublish)
+		case HookBatchPublish:
+			b.funcBatchPublish = h(b.funcBatchPublish)
+		case HookSubscribe:
+			b.funcSubscribe = h(b.funcSubscribe)
+		case HookBatchSubscribe:
+			b.funcBatchSubscribe = h(b.funcBatchSubscribe)
+		}
+	})
+
+	return nil
+}
+
+func (b *NoopBroker) Connect(_ context.Context) error {
+	return nil
+}
+
+func (b *NoopBroker) Disconnect(_ context.Context) error {
+	return nil
+}
+
+func (b *NoopBroker) Address() string {
+	return strings.Join(b.opts.Addrs, ",")
+}
+
+func (b *NoopBroker) fnBatchPublish(_ context.Context, _ []*Message, _ ...PublishOption) error {
+	return nil
+}
+
+func (b *NoopBroker) BatchPublish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
+	return b.funcBatchPublish(ctx, msgs, opts...)
+}
+
+func (b *NoopBroker) fnPublish(_ context.Context, _ string, _ *Message, _ ...PublishOption) error {
+	return nil
+}
+
+func (b *NoopBroker) Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error {
+	return b.funcPublish(ctx, topic, msg, opts...)
+}
+
+type NoopSubscriber struct {
+	ctx          context.Context
+	topic        string
+	handler      Handler
+	batchHandler BatchHandler
+	opts         SubscribeOptions
+}
+
+func (b *NoopBroker) fnBatchSubscribe(ctx context.Context, topic string, handler BatchHandler, opts ...SubscribeOption) (Subscriber, error) {
+	return &NoopSubscriber{ctx: ctx, topic: topic, opts: NewSubscribeOptions(opts...), batchHandler: handler}, nil
+}
+
+func (b *NoopBroker) BatchSubscribe(ctx context.Context, topic string, handler BatchHandler, opts ...SubscribeOption) (Subscriber, error) {
+	return b.funcBatchSubscribe(ctx, topic, handler, opts...)
+}
+
+func (b *NoopBroker) fnSubscribe(ctx context.Context, topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
+	return &NoopSubscriber{ctx: ctx, topic: topic, opts: NewSubscribeOptions(opts...), handler: handler}, nil
+}
+
+func (b *NoopBroker) Subscribe(ctx context.Context, topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
+	return b.funcSubscribe(ctx, topic, handler, opts...)
+}
+
+func (s *NoopSubscriber) Options() SubscribeOptions {
+	return s.opts
+}
+
+func (s *NoopSubscriber) Topic() string {
+	return s.topic
+}
+
+func (s *NoopSubscriber) Unsubscribe(_ context.Context) error {
+	return nil
+}

broker/noop_test.go

@@ -0,0 +1,35 @@
+package broker
+
+import (
+	"context"
+	"testing"
+)
+
+type testHook struct {
+	f bool
+}
+
+func (t *testHook) Publish1(fn FuncPublish) FuncPublish {
+	return func(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error {
+		t.f = true
+		return fn(ctx, topic, msg, opts...)
+	}
+}
+
+func TestNoopHook(t *testing.T) {
+	h := &testHook{}
+
+	b := NewBroker(Hooks(HookPublish(h.Publish1)))
+
+	if err := b.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := b.Publish(context.TODO(), "", nil); err != nil {
+		t.Fatal(err)
+	}
+
+	if !h.f {
+		t.Fatal("hook not works")
+	}
+}

broker/options.go

@@ -8,7 +8,9 @@ import (
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/logger"
 	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/register"
+	"go.unistack.org/micro/v3/sync"
 	"go.unistack.org/micro/v3/tracer"
 )
 
@@ -36,6 +38,13 @@ type Options struct {
 	Name string
 	// Addrs holds the broker address
 	Addrs []string
+	// Wait waits for a collection of goroutines to finish
+	Wait *sync.WaitGroup
+	// GracefulTimeout contains time to wait to finish in flight requests
+	GracefulTimeout time.Duration
+	// Hooks can be run before broker Publish/BatchPublish and
+	// Subscribe/BatchSubscribe methods
+	Hooks options.Hooks
 }
 
 // NewOptions create new Options
@@ -47,6 +56,7 @@ func NewOptions(opts ...Option) Options {
 		Meter:           meter.DefaultMeter,
 		Codec:           codec.DefaultCodec,
 		Tracer:          tracer.DefaultTracer,
+		GracefulTimeout: DefaultGracefulTimeout,
 	}
 	for _, o := range opts {
 		o(&options)
@@ -224,6 +234,13 @@ func Name(n string) Option {
 	}
 }
 
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
+	return func(o *Options) {
+		o.Hooks = append(o.Hooks, h...)
+	}
+}
+
 // SubscribeContext set context
 func SubscribeContext(ctx context.Context) SubscribeOption {
 	return func(o *SubscribeOptions) {

build/build.go

@@ -1,32 +0,0 @@
-// Package build is for building source into a package
-package build // import "go.unistack.org/micro/v3/build"
-
-// Build is an interface for building packages
-type Build interface {
-	// Package builds a package
-	Package(name string, src *Source) (*Package, error)
-	// Remove removes the package
-	Remove(*Package) error
-}
-
-// Source is the source of a build
-type Source struct {
-	// Path to the source if local
-	Path string
-	// Language is the language of code
-	Language string
-	// Location of the source
-	Repository string
-}
-
-// Package is packaged format for source
-type Package struct {
-	// Source of the package
-	Source *Source
-	// Name of the package
-	Name string
-	// Location of the package
-	Path string
-	// Type of package e.g tarball, binary, docker
-	Type string
-}

build/options.go

@@ -1,17 +0,0 @@
-package build
-
-// Options struct
-type Options struct {
-	// local path to download source
-	Path string
-}
-
-// Option func
-type Option func(o *Options)
-
-// Path is the Local path for repository
-func Path(p string) Option {
-	return func(o *Options) {
-		o.Path = p
-	}
-}

client/backoff.go

@@ -2,6 +2,7 @@ package client
 
 import (
 	"context"
+	"math"
 	"time"
 
 	"go.unistack.org/micro/v3/util/backoff"
@@ -10,6 +11,20 @@ import (
 // BackoffFunc is the backoff call func
 type BackoffFunc func(ctx context.Context, req Request, attempts int) (time.Duration, error)
 
-func exponentialBackoff(ctx context.Context, req Request, attempts int) (time.Duration, error) {
+// BackoffExp using exponential backoff func
+func BackoffExp(_ context.Context, _ Request, attempts int) (time.Duration, error) {
 	return backoff.Do(attempts), nil
 }
+
+// BackoffInterval specifies randomization interval for backoff func
+func BackoffInterval(min time.Duration, max time.Duration) BackoffFunc {
+	return func(_ context.Context, _ Request, attempts int) (time.Duration, error) {
+		td := time.Duration(math.Pow(float64(attempts), math.E)) * time.Millisecond * 100
+		if td < min {
+			return min, nil
+		} else if td > max {
+			return max, nil
+		}
+		return td, nil
+	}
+}

client/backoff_test.go

@@ -6,7 +6,7 @@ import (
 	"time"
 )
 
-func TestBackoff(t *testing.T) {
+func TestBackoffExp(t *testing.T) {
 	results := []time.Duration{
 		0 * time.Second,
 		100 * time.Millisecond,
@@ -22,7 +22,7 @@ func TestBackoff(t *testing.T) {
 	}
 
 	for i := 0; i < 5; i++ {
-		d, err := exponentialBackoff(context.TODO(), r, i)
+		d, err := BackoffExp(context.TODO(), r, i)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -32,3 +32,25 @@ func TestBackoff(t *testing.T) {
 		}
 	}
 }
+
+func TestBackoffInterval(t *testing.T) {
+	min := 100 * time.Millisecond
+	max := 300 * time.Millisecond
+
+	r := &testRequest{
+		service: "test",
+		method:  "test",
+	}
+
+	fn := BackoffInterval(min, max)
+	for i := 0; i < 5; i++ {
+		d, err := fn(context.TODO(), r, i)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if d < min || d > max {
+			t.Fatalf("Expected %v < %v < %v", min, d, max)
+		}
+	}
+}

client/client.go

@@ -1,5 +1,5 @@
 // Package client is an interface for an RPC client
-package client // import "go.unistack.org/micro/v3/client"
+package client
 
 import (
 	"context"
@@ -11,11 +11,11 @@ import (
 
 var (
 	// DefaultClient is the global default client
-	DefaultClient Client = NewClient()
+	DefaultClient = NewClient()
 	// DefaultContentType is the default content-type if not specified
-	DefaultContentType = "application/json"
+	DefaultContentType = ""
-	// DefaultBackoff is the default backoff function for retries
+	// DefaultBackoff is the default backoff function for retries (minimum 10 millisecond and maximum 5 second)
-	DefaultBackoff = exponentialBackoff
+	DefaultBackoff = BackoffInterval(10*time.Millisecond, 5*time.Second)
 	// DefaultRetry is the default check-for-retry function for retries
 	DefaultRetry = RetryNever
 	// DefaultRetries is the default number of times a request is tried
@@ -44,6 +44,17 @@ type Client interface {
 	String() string
 }
 
+type (
+	FuncCall         func(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
+	HookCall         func(next FuncCall) FuncCall
+	FuncStream       func(ctx context.Context, req Request, opts ...CallOption) (Stream, error)
+	HookStream       func(next FuncStream) FuncStream
+	FuncPublish      func(ctx context.Context, msg Message, opts ...PublishOption) error
+	HookPublish      func(next FuncPublish) FuncPublish
+	FuncBatchPublish func(ctx context.Context, msg []Message, opts ...PublishOption) error
+	HookBatchPublish func(next FuncBatchPublish) FuncBatchPublish
+)
+
 // Message is the interface for publishing asynchronously
 type Message interface {
 	Topic() string
@@ -74,7 +85,7 @@ type Request interface {
 type Response interface {
 	// Read the response
 	Codec() codec.Codec
-	// read the header
+	// Header data
 	Header() metadata.Metadata
 	// Read the undecoded response
 	Read() ([]byte, error)
@@ -92,10 +103,16 @@ type Stream interface {
 	Send(msg interface{}) error
 	// Recv will decode and read a response
 	Recv(msg interface{}) error
+	// SendMsg will encode and send a request
+	SendMsg(msg interface{}) error
+	// RecvMsg will decode and read a response
+	RecvMsg(msg interface{}) error
 	// Error returns the stream error
 	Error() error
 	// Close closes the stream
 	Close() error
+	// CloseSend closes the send direction of the stream
+	CloseSend() error
 }
 
 // Option used by the Client

client/context_test.go

@@ -0,0 +1,73 @@
+package client
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), clientKey{}, NewClient())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestFromNilContext(t *testing.T) {
+	// nolint: staticcheck
+	c, ok := FromContext(nil)
+	if ok || c != nil {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewClient())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestNewNilContext(t *testing.T) {
+	// nolint: staticcheck
+	ctx := NewContext(nil, NewClient())
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestSetPublishOption(t *testing.T) {
+	type key struct{}
+	o := SetPublishOption(key{}, "test")
+	opts := &PublishOptions{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetPublishOption not works")
+	}
+}
+
+func TestSetCallOption(t *testing.T) {
+	type key struct{}
+	o := SetCallOption(key{}, "test")
+	opts := &CallOptions{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetCallOption not works")
+	}
+}
+
+func TestSetOption(t *testing.T) {
+	type key struct{}
+	o := SetOption(key{}, "test")
+	opts := &Options{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetOption not works")
+	}
+}

client/noop.go

@@ -2,11 +2,19 @@ package client
 
 import (
 	"context"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
 
 	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/errors"
 	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v3/options"
+	"go.unistack.org/micro/v3/selector"
+	"go.unistack.org/micro/v3/semconv"
+	"go.unistack.org/micro/v3/tracer"
 )
 
 // DefaultCodecs will be used to encode/decode data
@@ -15,6 +23,10 @@ var DefaultCodecs = map[string]codec.Codec{
 }
 
 type noopClient struct {
+	funcPublish      FuncPublish
+	funcBatchPublish FuncBatchPublish
+	funcCall         FuncCall
+	funcStream       FuncStream
 	opts             Options
 }
 
@@ -36,16 +48,14 @@ type noopRequest struct {
 
 // NewClient returns new noop client
 func NewClient(opts ...Option) Client {
-	nc := &noopClient{opts: NewOptions(opts...)}
+	n := &noopClient{opts: NewOptions(opts...)}
-	// wrap in reverse
 
-	c := Client(nc)
+	n.funcCall = n.fnCall
+	n.funcStream = n.fnStream
+	n.funcPublish = n.fnPublish
+	n.funcBatchPublish = n.fnBatchPublish
 
-	for i := len(nc.opts.Wrappers); i > 0; i-- {
+	return n
-		c = nc.opts.Wrappers[i-1](c)
-	}
-
-	return c
 }
 
 func (n *noopClient) Name() string {
@@ -97,10 +107,13 @@ func (n *noopResponse) Read() ([]byte, error) {
 	return nil, nil
 }
 
-type noopStream struct{}
+type noopStream struct {
+	err error
+	ctx context.Context
+}
 
 func (n *noopStream) Context() context.Context {
-	return context.Background()
+	return n.ctx
 }
 
 func (n *noopStream) Request() Request {
@@ -119,14 +132,32 @@ func (n *noopStream) Recv(interface{}) error {
 	return nil
 }
 
-func (n *noopStream) Error() error {
+func (n *noopStream) SendMsg(interface{}) error {
 	return nil
 }
 
-func (n *noopStream) Close() error {
+func (n *noopStream) RecvMsg(interface{}) error {
 	return nil
 }
 
+func (n *noopStream) Error() error {
+	return n.err
+}
+
+func (n *noopStream) Close() error {
+	if sp, ok := tracer.SpanFromContext(n.ctx); ok && sp != nil {
+		if n.err != nil {
+			sp.SetStatus(tracer.SpanStatusError, n.err.Error())
+		}
+		sp.Finish()
+	}
+	return n.err
+}
+
+func (n *noopStream) CloseSend() error {
+	return n.err
+}
+
 func (n *noopMessage) Topic() string {
 	return n.topic
 }
@@ -157,6 +188,25 @@ func (n *noopClient) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&n.opts)
 	}
+
+	n.funcCall = n.fnCall
+	n.funcStream = n.fnStream
+	n.funcPublish = n.fnPublish
+	n.funcBatchPublish = n.fnBatchPublish
+
+	n.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case HookCall:
+			n.funcCall = h(n.funcCall)
+		case HookStream:
+			n.funcStream = h(n.funcStream)
+		case HookPublish:
+			n.funcPublish = h(n.funcPublish)
+		case HookBatchPublish:
+			n.funcBatchPublish = h(n.funcBatchPublish)
+		}
+	})
+
 	return nil
 }
 
@@ -169,9 +219,159 @@ func (n *noopClient) String() string {
 }
 
 func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
+	ts := time.Now()
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = n.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	err := n.funcCall(ctx, req, rsp, opts...)
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	n.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	n.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return err
+}
+
+func (n *noopClient) fnCall(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
+	// make a copy of call opts
+	callOpts := n.opts.CallOptions
+	for _, opt := range opts {
+		opt(&callOpts)
+	}
+
+	// check if we already have a deadline
+	d, ok := ctx.Deadline()
+	if !ok {
+		var cancel context.CancelFunc
+		// no deadline so we create a new one
+		ctx, cancel = context.WithTimeout(ctx, callOpts.RequestTimeout)
+		defer cancel()
+	} else {
+		// got a deadline so no need to setup context
+		// but we need to set the timeout we pass along
+		opt := WithRequestTimeout(time.Until(d))
+		opt(&callOpts)
+	}
+
+	// should we noop right here?
+	select {
+	case <-ctx.Done():
+		return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+	default:
+	}
+
+	// make copy of call method
+	hcall := func(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error {
 		return nil
 	}
 
+	// use the router passed as a call option, or fallback to the rpc clients router
+	if callOpts.Router == nil {
+		callOpts.Router = n.opts.Router
+	}
+
+	if callOpts.Selector == nil {
+		callOpts.Selector = n.opts.Selector
+	}
+
+	// inject proxy address
+	// TODO: don't even bother using Lookup/Select in this case
+	if len(n.opts.Proxy) > 0 {
+		callOpts.Address = []string{n.opts.Proxy}
+	}
+
+	var next selector.Next
+
+	// return errors.New("go.micro.client", "request timeout", 408)
+	call := func(i int) error {
+		// call backoff first. Someone may want an initial start delay
+		t, err := callOpts.Backoff(ctx, req, i)
+		if err != nil {
+			return errors.InternalServerError("go.micro.client", err.Error())
+		}
+
+		// only sleep if greater than 0
+		if t.Seconds() > 0 {
+			time.Sleep(t)
+		}
+
+		if next == nil {
+			var routes []string
+			// lookup the route to send the reques to
+			// TODO apply any filtering here
+			routes, err = n.opts.Lookup(ctx, req, callOpts)
+			if err != nil {
+				return errors.InternalServerError("go.micro.client", err.Error())
+			}
+
+			// balance the list of nodes
+			next, err = callOpts.Selector.Select(routes)
+			if err != nil {
+				return err
+			}
+		}
+
+		node := next()
+
+		// make the call
+		err = hcall(ctx, node, req, rsp, callOpts)
+		// record the result of the call to inform future routing decisions
+		if verr := n.opts.Selector.Record(node, err); verr != nil {
+			return verr
+		}
+
+		// try and transform the error to a go-micro error
+		if verr, ok := err.(*errors.Error); ok {
+			return verr
+		}
+
+		return err
+	}
+
+	ch := make(chan error, callOpts.Retries)
+	var gerr error
+
+	for i := 0; i <= callOpts.Retries; i++ {
+		go func() {
+			ch <- call(i)
+		}()
+
+		select {
+		case <-ctx.Done():
+			return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+		case err := <-ch:
+			// if the call succeeded lets bail early
+			if err == nil {
+				return nil
+			}
+
+			retry, rerr := callOpts.Retry(ctx, req, i, err)
+			if rerr != nil {
+				return rerr
+			}
+
+			if !retry {
+				return err
+			}
+
+			gerr = err
+		}
+	}
+
+	return gerr
+}
+
 func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts ...RequestOption) Request {
 	return &noopRequest{service: service, endpoint: endpoint}
 }
@@ -182,14 +382,187 @@ func (n *noopClient) NewMessage(topic string, msg interface{}, opts ...MessageOp
 }
 
 func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
-	return &noopStream{}, nil
+	ts := time.Now()
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = n.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	stream, err := n.funcStream(ctx, req, opts...)
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	n.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	n.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return stream, err
+}
+
+func (n *noopClient) fnStream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
+	var err error
+
+	// make a copy of call opts
+	callOpts := n.opts.CallOptions
+	for _, o := range opts {
+		o(&callOpts)
+	}
+
+	// check if we already have a deadline
+	d, ok := ctx.Deadline()
+	if !ok && callOpts.StreamTimeout > time.Duration(0) {
+		var cancel context.CancelFunc
+		// no deadline so we create a new one
+		ctx, cancel = context.WithTimeout(ctx, callOpts.StreamTimeout)
+		defer cancel()
+	} else {
+		// got a deadline so no need to setup context
+		// but we need to set the timeout we pass along
+		o := WithStreamTimeout(time.Until(d))
+		o(&callOpts)
+	}
+
+	// should we noop right here?
+	select {
+	case <-ctx.Done():
+		return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+	default:
+	}
+
+	/*
+		// make copy of call method
+		hstream := h.stream
+		// wrap the call in reverse
+		for i := len(callOpts.CallWrappers); i > 0; i-- {
+			hstream = callOpts.CallWrappers[i-1](hstream)
+		}
+	*/
+
+	// use the router passed as a call option, or fallback to the rpc clients router
+	if callOpts.Router == nil {
+		callOpts.Router = n.opts.Router
+	}
+
+	if callOpts.Selector == nil {
+		callOpts.Selector = n.opts.Selector
+	}
+
+	// inject proxy address
+	// TODO: don't even bother using Lookup/Select in this case
+	if len(n.opts.Proxy) > 0 {
+		callOpts.Address = []string{n.opts.Proxy}
+	}
+
+	var next selector.Next
+
+	call := func(i int) (Stream, error) {
+		// call backoff first. Someone may want an initial start delay
+		t, cerr := callOpts.Backoff(ctx, req, i)
+		if cerr != nil {
+			return nil, errors.InternalServerError("go.micro.client", cerr.Error())
+		}
+
+		// only sleep if greater than 0
+		if t.Seconds() > 0 {
+			time.Sleep(t)
+		}
+
+		if next == nil {
+			var routes []string
+			// lookup the route to send the reques to
+			// TODO apply any filtering here
+			routes, err = n.opts.Lookup(ctx, req, callOpts)
+			if err != nil {
+				return nil, errors.InternalServerError("go.micro.client", err.Error())
+			}
+
+			// balance the list of nodes
+			next, err = callOpts.Selector.Select(routes)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		node := next()
+
+		stream, cerr := n.stream(ctx, node, req, callOpts)
+
+		// record the result of the call to inform future routing decisions
+		if verr := n.opts.Selector.Record(node, cerr); verr != nil {
+			return nil, verr
+		}
+
+		// try and transform the error to a go-micro error
+		if verr, ok := cerr.(*errors.Error); ok {
+			return nil, verr
+		}
+
+		return stream, cerr
+	}
+
+	type response struct {
+		stream Stream
+		err    error
+	}
+
+	ch := make(chan response, callOpts.Retries)
+	var grr error
+
+	for i := 0; i <= callOpts.Retries; i++ {
+		go func() {
+			s, cerr := call(i)
+			ch <- response{s, cerr}
+		}()
+
+		select {
+		case <-ctx.Done():
+			return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+		case rsp := <-ch:
+			// if the call succeeded lets bail early
+			if rsp.err == nil {
+				return rsp.stream, nil
+			}
+
+			retry, rerr := callOpts.Retry(ctx, req, i, err)
+			if rerr != nil {
+				return nil, rerr
+			}
+
+			if !retry {
+				return nil, rsp.err
+			}
+
+			grr = rsp.err
+		}
+	}
+
+	return nil, grr
+}
+
+func (n *noopClient) stream(ctx context.Context, addr string, req Request, opts CallOptions) (Stream, error) {
+	return &noopStream{ctx: ctx}, nil
 }
 
 func (n *noopClient) BatchPublish(ctx context.Context, ps []Message, opts ...PublishOption) error {
+	return n.funcBatchPublish(ctx, ps, opts...)
+}
+
+func (n *noopClient) fnBatchPublish(ctx context.Context, ps []Message, opts ...PublishOption) error {
 	return n.publish(ctx, ps, opts...)
 }
 
 func (n *noopClient) Publish(ctx context.Context, p Message, opts ...PublishOption) error {
+	return n.funcPublish(ctx, p, opts...)
+}
+
+func (n *noopClient) fnPublish(ctx context.Context, p Message, opts ...PublishOption) error {
 	return n.publish(ctx, []Message{p}, opts...)
 }
 
@@ -198,21 +571,34 @@ func (n *noopClient) publish(ctx context.Context, ps []Message, opts ...PublishO
 
 	msgs := make([]*broker.Message, 0, len(ps))
 
-	for _, p := range ps {
+	// get proxy
-		md, ok := metadata.FromOutgoingContext(ctx)
+	exchange := ""
-		if !ok {
+	if v, ok := os.LookupEnv("MICRO_PROXY"); ok {
-			md = metadata.New(0)
+		exchange = v
 	}
-		md[metadata.HeaderContentType] = p.ContentType()
-
-		topic := p.Topic()
-
 	// get the exchange
 	if len(options.Exchange) > 0 {
-			topic = options.Exchange
+		exchange = options.Exchange
 	}
 
+	omd, ok := metadata.FromOutgoingContext(ctx)
+	if !ok {
+		omd = metadata.New(0)
+	}
+
+	for _, p := range ps {
+		md := metadata.Copy(omd)
+		md[metadata.HeaderContentType] = p.ContentType()
+		topic := p.Topic()
+		if len(exchange) > 0 {
+			topic = exchange
+		}
 		md[metadata.HeaderTopic] = topic
+		iter := p.Metadata().Iterator()
+		var k, v string
+		for iter.Next(&k, &v) {
+			md.Set(k, v)
+		}
 
 		var body []byte
 
@@ -237,6 +623,13 @@ func (n *noopClient) publish(ctx context.Context, ps []Message, opts ...PublishO
 		msgs = append(msgs, &broker.Message{Header: md, Body: body})
 	}
 
+	if len(msgs) == 1 {
+		return n.opts.Broker.Publish(ctx, msgs[0].Header[metadata.HeaderTopic], msgs[0],
+			broker.PublishContext(options.Context),
+			broker.PublishBodyOnly(options.BodyOnly),
+		)
+	}
+
 	return n.opts.Broker.BatchPublish(ctx, msgs,
 		broker.PublishContext(options.Context),
 		broker.PublishBodyOnly(options.BodyOnly),

client/noop_test.go

@@ -0,0 +1,35 @@
+package client
+
+import (
+	"context"
+	"testing"
+)
+
+type testHook struct {
+	f bool
+}
+
+func (t *testHook) Publish(fn FuncPublish) FuncPublish {
+	return func(ctx context.Context, msg Message, opts ...PublishOption) error {
+		t.f = true
+		return fn(ctx, msg, opts...)
+	}
+}
+
+func TestNoopHook(t *testing.T) {
+	h := &testHook{}
+
+	c := NewClient(Hooks(HookPublish(h.Publish)))
+
+	if err := c.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := c.Publish(context.TODO(), c.NewMessage("", nil, MessageContentType("application/octet-stream"))); err != nil {
+		t.Fatal(err)
+	}
+
+	if !h.f {
+		t.Fatal("hook not works")
+	}
+}

client/options.go

@@ -3,6 +3,7 @@ package client
 import (
 	"context"
 	"crypto/tls"
+	"net"
 	"time"
 
 	"go.unistack.org/micro/v3/broker"
@@ -11,6 +12,7 @@ import (
 	"go.unistack.org/micro/v3/metadata"
 	"go.unistack.org/micro/v3/meter"
 	"go.unistack.org/micro/v3/network/transport"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/register"
 	"go.unistack.org/micro/v3/router"
 	"go.unistack.org/micro/v3/selector"
@@ -56,6 +58,11 @@ type Options struct {
 	PoolSize int
 	// PoolTTL connection pool ttl
 	PoolTTL time.Duration
+	// ContextDialer used to connect
+	ContextDialer func(context.Context, string) (net.Conn, error)
+	// Hooks can be run before broker Publish/BatchPublish and
+	// Subscribe/BatchSubscribe methods
+	Hooks options.Hooks
 }
 
 // NewCallOptions creates new call options struct
@@ -89,16 +96,27 @@ type CallOptions struct {
 	Address []string
 	// SelectOptions selector options
 	SelectOptions []selector.SelectOption
-	// CallWrappers call wrappers
-	CallWrappers []CallWrapper
 	// StreamTimeout stream timeout
 	StreamTimeout time.Duration
 	// RequestTimeout request timeout
 	RequestTimeout time.Duration
+	// RequestMetadata holds additional metadata for call
+	RequestMetadata metadata.Metadata
+	// ResponseMetadata holds additional metadata from call
+	ResponseMetadata *metadata.Metadata
 	// DialTimeout dial timeout
 	DialTimeout time.Duration
 	// Retries specifies retries num
 	Retries int
+	// ContextDialer used to connect
+	ContextDialer func(context.Context, string) (net.Conn, error)
+}
+
+// ContextDialer pass ContextDialer to client
+func ContextDialer(fn func(context.Context, string) (net.Conn, error)) Option {
+	return func(o *Options) {
+		o.ContextDialer = fn
+	}
 }
 
 // Context pass context to client
@@ -169,7 +187,7 @@ func NewOptions(opts ...Option) Options {
 	options := Options{
 		Context:     context.Background(),
 		ContentType: DefaultContentType,
-		Codecs:      make(map[string]codec.Codec),
+		Codecs:      DefaultCodecs,
 		CallOptions: CallOptions{
 			Context:        context.Background(),
 			Backoff:        DefaultBackoff,
@@ -290,20 +308,6 @@ func Selector(s selector.Selector) Option {
 	}
 }
 
-// Wrap adds a wrapper to the list of options passed into the client
-func Wrap(w Wrapper) Option {
-	return func(o *Options) {
-		o.Wrappers = append(o.Wrappers, w)
-	}
-}
-
-// WrapCall adds a wrapper to the list of CallFunc wrappers
-func WrapCall(cw ...CallWrapper) Option {
-	return func(o *Options) {
-		o.CallOptions.CallWrappers = append(o.CallOptions.CallWrappers, cw...)
-	}
-}
-
 // Backoff is used to set the backoff function used when retrying Calls
 func Backoff(fn BackoffFunc) Option {
 	return func(o *Options) {
@@ -413,6 +417,13 @@ func PublishContext(ctx context.Context) PublishOption {
 	}
 }
 
+// WithContextDialer pass ContextDialer to client call
+func WithContextDialer(fn func(context.Context, string) (net.Conn, error)) CallOption {
+	return func(o *CallOptions) {
+		o.ContextDialer = fn
+	}
+}
+
 // WithContentType specifies call content type
 func WithContentType(ct string) CallOption {
 	return func(o *CallOptions) {
@@ -427,13 +438,6 @@ func WithAddress(a ...string) CallOption {
 	}
 }
 
-// WithCallWrapper is a CallOption which adds to the existing CallFunc wrappers
-func WithCallWrapper(cw ...CallWrapper) CallOption {
-	return func(o *CallOptions) {
-		o.CallWrappers = append(o.CallWrappers, cw...)
-	}
-}
-
 // WithBackoff is a CallOption which overrides that which
 // set in Options.CallOptions
 func WithBackoff(fn BackoffFunc) CallOption {
@@ -458,6 +462,20 @@ func WithRetries(i int) CallOption {
 	}
 }
 
+// WithResponseMetadata is a CallOption which adds metadata.Metadata to Options.CallOptions
+func WithResponseMetadata(md *metadata.Metadata) CallOption {
+	return func(o *CallOptions) {
+		o.ResponseMetadata = md
+	}
+}
+
+// WithRequestMetadata is a CallOption which adds metadata.Metadata to Options.CallOptions
+func WithRequestMetadata(md metadata.Metadata) CallOption {
+	return func(o *CallOptions) {
+		o.RequestMetadata = md
+	}
+}
+
 // WithRequestTimeout is a CallOption which overrides that which
 // set in Options.CallOptions
 func WithRequestTimeout(d time.Duration) CallOption {
@@ -554,3 +572,10 @@ func RequestContentType(ct string) RequestOption {
 		o.ContentType = ct
 	}
 }
+
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
+	return func(o *Options) {
+		o.Hooks = append(o.Hooks, h...)
+	}
+}

client/retry.go

@@ -19,18 +19,32 @@ func RetryNever(ctx context.Context, req Request, retryCount int, err error) (bo
 	return false, nil
 }
 
-// RetryOnError retries a request on a 500 or timeout error
+// RetryOnError retries a request on a 500 or 408 (timeout) error
 func RetryOnError(_ context.Context, _ Request, _ int, err error) (bool, error) {
 	if err == nil {
 		return false, nil
 	}
-
 	me := errors.FromError(err)
 	switch me.Code {
 	// retry on timeout or internal server error
 	case 408, 500:
 		return true, nil
 	}
-
 	return false, nil
 }
+
+// RetryOnErrors retries a request on specified error codes
+func RetryOnErrors(codes ...int32) RetryFunc {
+	return func(_ context.Context, _ Request, _ int, err error) (bool, error) {
+		if err == nil {
+			return false, nil
+		}
+		me := errors.FromError(err)
+		for _, code := range codes {
+			if me.Code == code {
+				return true, nil
+			}
+		}
+		return false, nil
+	}
+}

client/retry_test.go

@@ -0,0 +1,70 @@
+package client
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"go.unistack.org/micro/v3/errors"
+)
+
+func TestRetryAlways(t *testing.T) {
+	tests := []error{
+		nil,
+		errors.InternalServerError("test", "%s", "test"),
+		fmt.Errorf("test"),
+	}
+
+	for _, e := range tests {
+		ok, er := RetryAlways(context.TODO(), nil, 1, e)
+		if !ok || er != nil {
+			t.Fatal("RetryAlways not works properly")
+		}
+	}
+}
+
+func TestRetryNever(t *testing.T) {
+	tests := []error{
+		nil,
+		errors.InternalServerError("test", "%s", "test"),
+		fmt.Errorf("test"),
+	}
+
+	for _, e := range tests {
+		ok, er := RetryNever(context.TODO(), nil, 1, e)
+		if ok || er != nil {
+			t.Fatal("RetryNever not works properly")
+		}
+	}
+}
+
+func TestRetryOnError(t *testing.T) {
+	tests := []error{
+		fmt.Errorf("test"),
+		errors.NotFound("test", "%s", "test"),
+		errors.Timeout("test", "%s", "test"),
+	}
+
+	for i, e := range tests {
+		ok, er := RetryOnError(context.TODO(), nil, 1, e)
+		if i == 2 && (!ok || er != nil) {
+			t.Fatal("RetryOnError not works properly")
+		}
+	}
+}
+
+func TestRetryOnErrors(t *testing.T) {
+	tests := []error{
+		fmt.Errorf("test"),
+		errors.NotFound("test", "%s", "test"),
+		errors.Timeout("test", "%s", "test"),
+	}
+
+	fn := RetryOnErrors(404)
+	for i, e := range tests {
+		ok, er := fn(context.TODO(), nil, 1, e)
+		if i == 1 && (!ok || er != nil) {
+			t.Fatal("RetryOnErrors not works properly")
+		}
+	}
+}

cluster/cluster.go

@@ -0,0 +1,41 @@
+package cluster
+
+import (
+	"context"
+
+	"go.unistack.org/micro/v3/metadata"
+)
+
+// Message sent to member in cluster
+type Message interface {
+	// Header returns message headers
+	Header() metadata.Metadata
+	// Body returns broker message may be []byte slice or some go struct or interface
+	Body() interface{}
+}
+
+type Node interface {
+	// Name returns node name
+	Name() string
+	// Address returns node address
+	Address() string
+	// Metadata returns node metadata
+	Metadata() metadata.Metadata
+}
+
+// Cluster interface used for cluster communication across nodes
+type Cluster interface {
+	// Join is used to take an existing members and performing state sync
+	Join(ctx context.Context, addr ...string) error
+	// Leave broadcast a leave message and stop listeners
+	Leave(ctx context.Context) error
+	// Ping is used to probe live status of the node
+	Ping(ctx context.Context, node Node, payload []byte) error
+	// Members returns the cluster members
+	Members() ([]Node, error)
+	// Broadcast send message for all members in cluster, if filter is not nil, nodes may be filtered
+	// by key/value pairs
+	Broadcast(ctx context.Context, msg Message, filter ...string) error
+	// Unicast send message to single member in cluster
+	Unicast(ctx context.Context, node Node, msg Message) error
+}

codec/codec.go

@@ -1,19 +1,8 @@
 // Package codec is an interface for encoding messages
-package codec // import "go.unistack.org/micro/v3/codec"
+package codec
 
 import (
 	"errors"
-	"io"
-
-	"go.unistack.org/micro/v3/metadata"
-)
-
-// Message types
-const (
-	Error MessageType = iota
-	Request
-	Response
-	Event
 )
 
 var (
@@ -24,63 +13,44 @@ var (
 )
 
 var (
-	// DefaultMaxMsgSize specifies how much data codec can handle
-	DefaultMaxMsgSize = 1024 * 1024 * 4 // 4Mb
 	// DefaultCodec is the global default codec
-	DefaultCodec Codec = NewCodec()
+	DefaultCodec = NewCodec()
 	// DefaultTagName specifies struct tag name to control codec Marshal/Unmarshal
 	DefaultTagName = "codec"
 )
 
-// MessageType specifies message type for codec
+// Codec encodes/decodes various types of messages.
-type MessageType int
-
-// Codec encodes/decodes various types of messages used within micro.
-// ReadHeader and ReadBody are called in pairs to read requests/responses
-// from the connection. Close is called when finished with the
-// connection. ReadBody may be called with a nil argument to force the
-// body to be read and discarded.
 type Codec interface {
-	ReadHeader(r io.Reader, m *Message, mt MessageType) error
-	ReadBody(r io.Reader, v interface{}) error
-	Write(w io.Writer, m *Message, v interface{}) error
 	Marshal(v interface{}, opts ...Option) ([]byte, error)
 	Unmarshal(b []byte, v interface{}, opts ...Option) error
 	String() string
 }
 
-// Message represents detailed information about
+type CodecV2 interface {
-// the communication, likely followed by the body.
+	Marshal(buf []byte, v interface{}, opts ...Option) ([]byte, error)
-// In the case of an error, body may be nil.
+	Unmarshal(buf []byte, v interface{}, opts ...Option) error
-type Message struct {
+	String() string
-	Header   metadata.Metadata
-	Target   string
-	Method   string
-	Endpoint string
-	Error    string
-	ID       string
-	Body     []byte
-	Type     MessageType
 }
 
-// NewMessage creates new codec message
+// RawMessage is a raw encoded JSON value.
-func NewMessage(t MessageType) *Message {
+// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
-	return &Message{Type: t, Header: metadata.New(0)}
+type RawMessage []byte
+
+// MarshalJSON returns m as the JSON encoding of m.
+func (m *RawMessage) MarshalJSON() ([]byte, error) {
+	if m == nil {
+		return []byte("null"), nil
+	} else if len(*m) == 0 {
+		return []byte("null"), nil
+	}
+	return *m, nil
 }
 
-// MarshalAppend calls codec.Marshal(v) and returns the data appended to buf.
+// UnmarshalJSON sets *m to a copy of data.
-// If codec implements MarshalAppend, that is called instead.
+func (m *RawMessage) UnmarshalJSON(data []byte) error {
-func MarshalAppend(buf []byte, c Codec, v interface{}, opts ...Option) ([]byte, error) {
+	if m == nil {
-	if nc, ok := c.(interface {
+		return errors.New("RawMessage UnmarshalJSON on nil pointer")
-		MarshalAppend([]byte, interface{}, ...Option) ([]byte, error)
-	}); ok {
-		return nc.MarshalAppend(buf, v, opts...)
 	}
-
+	*m = append((*m)[0:0], data...)
-	mbuf, err := c.Marshal(v, opts...)
+	return nil
-	if err != nil {
-		return nil, err
-	}
-
-	return append(buf, mbuf...), nil
 }

codec/context_test.go

@@ -0,0 +1,35 @@
+package codec
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), codecKey{}, NewCodec())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewCodec())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestSetOption(t *testing.T) {
+	type key struct{}
+	o := SetOption(key{}, "test")
+	opts := &Options{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetOption not works")
+	}
+}

codec/noop.go

@@ -2,70 +2,14 @@ package codec
 
 import (
 	"encoding/json"
-	"io"
+
+	codecpb "go.unistack.org/micro-proto/v3/codec"
 )
 
 type noopCodec struct {
 	opts Options
 }
 
-func (c *noopCodec) ReadHeader(conn io.Reader, m *Message, t MessageType) error {
-	return nil
-}
-
-func (c *noopCodec) ReadBody(conn io.Reader, b interface{}) error {
-	// read bytes
-	buf, err := io.ReadAll(conn)
-	if err != nil {
-		return err
-	}
-
-	if b == nil {
-		return nil
-	}
-
-	switch v := b.(type) {
-	case *string:
-		*v = string(buf)
-	case *[]byte:
-		*v = buf
-	case *Frame:
-		v.Data = buf
-	default:
-		return json.Unmarshal(buf, v)
-	}
-
-	return nil
-}
-
-func (c *noopCodec) Write(conn io.Writer, m *Message, b interface{}) error {
-	if b == nil {
-		return nil
-	}
-
-	var v []byte
-	switch vb := b.(type) {
-	case *Frame:
-		v = vb.Data
-	case string:
-		v = []byte(vb)
-	case *string:
-		v = []byte(*vb)
-	case *[]byte:
-		v = *vb
-	case []byte:
-		v = vb
-	default:
-		var err error
-		v, err = json.Marshal(vb)
-		if err != nil {
-			return err
-		}
-	}
-	_, err := conn.Write(v)
-	return err
-}
-
 func (c *noopCodec) String() string {
 	return "noop"
 }
@@ -91,8 +35,8 @@ func (c *noopCodec) Marshal(v interface{}, opts ...Option) ([]byte, error) {
 		return ve, nil
 	case *Frame:
 		return ve.Data, nil
-	case *Message:
+	case *codecpb.Frame:
-		return ve.Body, nil
+		return ve.Data, nil
 	}
 
 	return json.Marshal(v)
@@ -106,14 +50,17 @@ func (c *noopCodec) Unmarshal(d []byte, v interface{}, opts ...Option) error {
 	case *string:
 		*ve = string(d)
 		return nil
+	case []byte:
+		copy(ve, d)
+		return nil
 	case *[]byte:
 		*ve = d
 		return nil
 	case *Frame:
 		ve.Data = d
 		return nil
-	case *Message:
+	case *codecpb.Frame:
-		ve.Body = d
+		ve.Data = d
 		return nil
 	}
 

codec/noop_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 )
 
-func TestNoopBytes(t *testing.T) {
+func TestNoopBytesPtr(t *testing.T) {
 	req := []byte("test req")
 	rsp := make([]byte, len(req))
 
@@ -19,6 +19,20 @@ func TestNoopBytes(t *testing.T) {
 	}
 }
 
+func TestNoopBytes(t *testing.T) {
+	req := []byte("test req")
+	var rsp []byte
+
+	nc := NewCodec()
+	if err := nc.Unmarshal(req, &rsp); err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(req, rsp) {
+		t.Fatalf("req not eq rsp: %s != %s", req, rsp)
+	}
+}
+
 func TestNoopString(t *testing.T) {
 	req := []byte("test req")
 	var rsp string

codec/options.go

@@ -23,15 +23,8 @@ type Options struct {
 	Context context.Context
 	// TagName specifies tag name in struct to control codec
 	TagName string
-	// MaxMsgSize specifies max messages size that reads by codec
+	// Flatten specifies that struct must be analyzed for flatten tag
-	MaxMsgSize int
+	Flatten bool
-}
-
-// MaxMsgSize sets the max message size
-func MaxMsgSize(n int) Option {
-	return func(o *Options) {
-		o.MaxMsgSize = n
-	}
 }
 
 // TagName sets the codec tag name in struct
@@ -41,6 +34,13 @@ func TagName(n string) Option {
 	}
 }
 
+// Flatten enables checking for flatten tag name
+func Flatten(b bool) Option {
+	return func(o *Options) {
+		o.Flatten = b
+	}
+}
+
 // Logger sets the logger
 func Logger(l logger.Logger) Option {
 	return func(o *Options) {
@@ -69,8 +69,8 @@ func NewOptions(opts ...Option) Options {
 		Logger:  logger.DefaultLogger,
 		Meter:   meter.DefaultMeter,
 		Tracer:  tracer.DefaultTracer,
-		MaxMsgSize: DefaultMaxMsgSize,
 		TagName: DefaultTagName,
+		Flatten: false,
 	}
 
 	for _, o := range opts {

config/config.go

@@ -1,12 +1,18 @@
 // Package config is an interface for dynamic configuration.
-package config // import "go.unistack.org/micro/v3/config"
+package config
 
 import (
 	"context"
 	"errors"
+	"fmt"
+	"reflect"
 	"time"
 )
 
+type Validator interface {
+	Validate() error
+}
+
 // DefaultConfig default config
 var DefaultConfig Config = NewConfig()
 
@@ -45,6 +51,13 @@ type Config interface {
 	String() string
 }
 
+type (
+	FuncLoad func(ctx context.Context, opts ...LoadOption) error
+	HookLoad func(next FuncLoad) FuncLoad
+	FuncSave func(ctx context.Context, opts ...SaveOption) error
+	HookSave func(next FuncSave) FuncSave
+)
+
 // Watcher is the config watcher
 type Watcher interface {
 	// Next blocks until update happens or error returned
@@ -67,35 +80,66 @@ func Load(ctx context.Context, cs []Config, opts ...LoadOption) error {
 	return nil
 }
 
+// Validate runs Validate() error func for each struct field
+func Validate(ctx context.Context, cfg interface{}) error {
+	if cfg == nil {
+		return nil
+	}
+
+	if v, ok := cfg.(Validator); ok {
+		if err := v.Validate(); err != nil {
+			return err
+		}
+	}
+
+	sv := reflect.ValueOf(cfg)
+	if sv.Kind() == reflect.Ptr {
+		sv = sv.Elem()
+	}
+	if sv.Kind() != reflect.Struct {
+		return nil
+	}
+
+	typ := sv.Type()
+	for idx := 0; idx < typ.NumField(); idx++ {
+		fld := typ.Field(idx)
+		val := sv.Field(idx)
+		if !val.IsValid() || len(fld.PkgPath) != 0 {
+			continue
+		}
+
+		if v, ok := val.Interface().(Validator); ok {
+			if err := v.Validate(); err != nil {
+				return err
+			}
+		}
+
+		switch val.Kind() {
+		case reflect.Ptr:
+			if reflect.Indirect(val).Kind() == reflect.Struct {
+				if err := Validate(ctx, val.Interface()); err != nil {
+					return err
+				}
+			}
+		case reflect.Struct:
+			if err := Validate(ctx, val.Interface()); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
 var (
-	DefaultAfterLoad = func(ctx context.Context, c Config) error {
+	// DefaultBeforeLoad default func that runs before config Load
-		for _, fn := range c.Options().AfterLoad {
-			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s AfterLoad err: %v", c.String(), err)
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-
-	DefaultAfterSave = func(ctx context.Context, c Config) error {
-		for _, fn := range c.Options().AfterSave {
-			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s AfterSave err: %v", c.String(), err)
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-
 	DefaultBeforeLoad = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().BeforeLoad {
+			if fn == nil {
+				return nil
+			}
 			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s BeforeLoad err: %v", c.String(), err)
+				c.Options().Logger.Error(ctx, fmt.Sprintf("%s BeforeLoad error", c.String()), err)
 				if !c.Options().AllowFail {
 					return err
 				}
@@ -103,11 +147,74 @@ var (
 		}
 		return nil
 	}
-
+	// DefaultAfterLoad default func that runs after config Load
+	DefaultAfterLoad = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().AfterLoad {
+			if fn == nil {
+				return nil
+			}
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Error(ctx, fmt.Sprintf("%s AfterLoad error", c.String()), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+	// DefaultBeforeSave default func that runs befora config Save
 	DefaultBeforeSave = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().BeforeSave {
+			if fn == nil {
+				return nil
+			}
 			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s BeforeSavec err: %v", c.String(), err)
+				c.Options().Logger.Error(ctx, fmt.Sprintf("%s BeforeSave error", c.String()), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+	// DefaultAfterSave default func that runs after config Save
+	DefaultAfterSave = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().AfterSave {
+			if fn == nil {
+				return nil
+			}
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Error(ctx, fmt.Sprintf("%s AfterSave error", c.String()), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+	// DefaultBeforeInit default func that runs befora config Init
+	DefaultBeforeInit = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().BeforeInit {
+			if fn == nil {
+				return nil
+			}
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Error(ctx, fmt.Sprintf("%s BeforeInit error", c.String()), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+	// DefaultAfterInit default func that runs after config Init
+	DefaultAfterInit = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().AfterSave {
+			if fn == nil {
+				return nil
+			}
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Error(ctx, fmt.Sprintf("%s AfterInit error", c.String(), err), err)
 				if !c.Options().AllowFail {
 					return err
 				}

config/context_test.go

@@ -0,0 +1,86 @@
+package config
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromNilContext(t *testing.T) {
+	// nolint: staticcheck
+	c, ok := FromContext(nil)
+	if ok || c != nil {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewNilContext(t *testing.T) {
+	// nolint: staticcheck
+	ctx := NewContext(nil, NewConfig())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), configKey{}, NewConfig())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewConfig())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestSetOption(t *testing.T) {
+	type key struct{}
+	o := SetOption(key{}, "test")
+	opts := &Options{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetOption not works")
+	}
+}
+
+func TestSetSaveOption(t *testing.T) {
+	type key struct{}
+	o := SetSaveOption(key{}, "test")
+	opts := &SaveOptions{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetSaveOption not works")
+	}
+}
+
+func TestSetLoadOption(t *testing.T) {
+	type key struct{}
+	o := SetLoadOption(key{}, "test")
+	opts := &LoadOptions{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetLoadOption not works")
+	}
+}
+
+func TestSetWatchOption(t *testing.T) {
+	type key struct{}
+	o := SetWatchOption(key{}, "test")
+	opts := &WatchOptions{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetWatchOption not works")
+	}
+}

config/default.go

@@ -5,12 +5,19 @@ import (
 	"reflect"
 	"strconv"
 	"strings"
+	"time"
 
-	"github.com/imdario/mergo"
+	"dario.cat/mergo"
+	"github.com/google/uuid"
+	"go.unistack.org/micro/v3/options"
+	mid "go.unistack.org/micro/v3/util/id"
 	rutil "go.unistack.org/micro/v3/util/reflect"
+	mtime "go.unistack.org/micro/v3/util/time"
 )
 
 type defaultConfig struct {
+	funcLoad FuncLoad
+	funcSave FuncSave
 	opts     Options
 }
 
@@ -22,11 +29,42 @@ func (c *defaultConfig) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&c.opts)
 	}
+
+	if err := DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	c.funcLoad = c.fnLoad
+	c.funcSave = c.fnSave
+
+	c.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case HookLoad:
+			c.funcLoad = h(c.funcLoad)
+		case HookSave:
+			c.funcSave = h(c.funcSave)
+		}
+	})
+
+	if err := DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	return nil
 }
 
 func (c *defaultConfig) Load(ctx context.Context, opts ...LoadOption) error {
-	if err := DefaultBeforeLoad(ctx, c); err != nil {
+	return c.funcLoad(ctx, opts...)
+}
+
+func (c *defaultConfig) fnLoad(ctx context.Context, opts ...LoadOption) error {
+	var err error
+
+	if c.opts.SkipLoad != nil && c.opts.SkipLoad(ctx, c) {
+		return nil
+	}
+
+	if err = DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
@@ -49,21 +87,20 @@ func (c *defaultConfig) Load(ctx context.Context, opts ...LoadOption) error {
 		if !c.opts.AllowFail {
 			return err
 		}
-		return DefaultAfterLoad(ctx, c)
+		if err = DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
 	}
 
 	if err = fillValues(reflect.ValueOf(src), c.opts.StructTag); err == nil {
 		err = mergo.Merge(dst, src, mopts...)
 	}
 
-	if err != nil {
+	if err != nil && !c.opts.AllowFail {
-		c.opts.Logger.Errorf(ctx, "default load error: %v", err)
-		if !c.opts.AllowFail {
 		return err
 	}
-	}
 
-	if err := DefaultAfterLoad(ctx, c); err != nil {
+	if err := DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
@@ -75,6 +112,7 @@ func fillValue(value reflect.Value, val string) error {
 	if !rutil.IsEmpty(value) {
 		return nil
 	}
+
 	switch value.Kind() {
 	case reflect.Map:
 		t := value.Type()
@@ -113,6 +151,20 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(v))
 	case reflect.String:
+		switch val {
+		case "micro:generate uuid":
+			uid, err := uuid.NewRandom()
+			if err != nil {
+				return err
+			}
+			val = uid.String()
+		case "micro:generate id":
+			uid, err := mid.New()
+			if err != nil {
+				return err
+			}
+			val = uid
+		}
 		value.Set(reflect.ValueOf(val))
 	case reflect.Float32:
 		v, err := strconv.ParseFloat(val, 32)
@@ -151,11 +203,26 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(int32(v)))
 	case reflect.Int64:
+		switch {
+		case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "time":
+			v, err := time.ParseDuration(val)
+			if err != nil {
+				return err
+			}
+			value.Set(reflect.ValueOf(v))
+		case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "go.unistack.org/micro/v3/util/time":
+			v, err := mtime.ParseDuration(val)
+			if err != nil {
+				return err
+			}
+			value.SetInt(int64(v))
+		default:
 			v, err := strconv.ParseInt(val, 10, 64)
 			if err != nil {
 				return err
 			}
 			value.Set(reflect.ValueOf(v))
+		}
 	case reflect.Uint:
 		v, err := strconv.ParseUint(val, 10, 0)
 		if err != nil {
@@ -187,6 +254,7 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(v))
 	}
+
 	return nil
 }
 
@@ -250,6 +318,14 @@ func fillValues(valueOf reflect.Value, tname string) error {
 }
 
 func (c *defaultConfig) Save(ctx context.Context, opts ...SaveOption) error {
+	return c.funcSave(ctx, opts...)
+}
+
+func (c *defaultConfig) fnSave(ctx context.Context, opts ...SaveOption) error {
+	if c.opts.SkipSave != nil && c.opts.SkipSave(ctx, c) {
+		return nil
+	}
+
 	if err := DefaultBeforeSave(ctx, c); err != nil {
 		return err
 	}
@@ -269,7 +345,7 @@ func (c *defaultConfig) Name() string {
 	return c.opts.Name
 }
 
-func (c *defaultConfig) Watch(ctx context.Context, opts ...WatchOption) (Watcher, error) {
+func (c *defaultConfig) Watch(_ context.Context, _ ...WatchOption) (Watcher, error) {
 	return nil, ErrWatcherNotImplemented
 }
 
@@ -279,5 +355,9 @@ func NewConfig(opts ...Option) Config {
 	if len(options.StructTag) == 0 {
 		options.StructTag = "default"
 	}
-	return &defaultConfig{opts: options}
+	c := &defaultConfig{opts: options}
+	c.funcLoad = c.fnLoad
+	c.funcSave = c.fnSave
+
+	return c
 }

config/default_test.go

@@ -4,34 +4,87 @@ import (
 	"context"
 	"fmt"
 	"testing"
+	"time"
 
 	"go.unistack.org/micro/v3/config"
+	mid "go.unistack.org/micro/v3/util/id"
+	mtime "go.unistack.org/micro/v3/util/time"
 )
 
-type Cfg struct {
+type cfg struct {
 	StringValue    string `default:"string_value"`
 	IgnoreValue    string `json:"-"`
-	StructValue struct {
+	StructValue    *cfgStructValue
+	IntValue       int             `default:"99"`
+	DurationValue  time.Duration   `default:"10s"`
+	MDurationValue mtime.Duration  `default:"10s"`
+	MapValue       map[string]bool `default:"key1=true,key2=false"`
+	UUIDValue      string          `default:"micro:generate uuid"`
+	IDValue        string          `default:"micro:generate id"`
+}
+
+type cfgStructValue struct {
 	StringValue string `default:"string_value"`
 }
-	IntValue int `default:"99"`
+
+func (c *cfg) Validate() error {
+	if c.IntValue != 10 {
+		return fmt.Errorf("invalid IntValue %d != %d", 10, c.IntValue)
+	}
+	return nil
+}
+
+func (c *cfgStructValue) Validate() error {
+	if c.StringValue != "string_value" {
+		return fmt.Errorf("invalid StringValue %s != %s", "string_value", c.StringValue)
+	}
+	return nil
+}
+
+type testHook struct {
+	f bool
+}
+
+func (t *testHook) Load(fn config.FuncLoad) config.FuncLoad {
+	return func(ctx context.Context, opts ...config.LoadOption) error {
+		t.f = true
+		return fn(ctx, opts...)
+	}
+}
+
+func TestHook(t *testing.T) {
+	h := &testHook{}
+
+	c := config.NewConfig(config.Struct(h), config.Hooks(config.HookLoad(h.Load)))
+
+	if err := c.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := c.Load(context.TODO()); err != nil {
+		t.Fatal(err)
+	}
+
+	if !h.f {
+		t.Fatal("hook not works")
+	}
 }
 
 func TestDefault(t *testing.T) {
 	ctx := context.Background()
-	conf := &Cfg{IntValue: 10}
+	conf := &cfg{IntValue: 10}
-	blfn := func(ctx context.Context, cfg config.Config) error {
+	blfn := func(_ context.Context, c config.Config) error {
-		nconf, ok := cfg.Options().Struct.(*Cfg)
+		nconf, ok := c.Options().Struct.(*cfg)
 		if !ok {
-			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
+			return fmt.Errorf("failed to get Struct from options: %v", c.Options())
 		}
 		nconf.StringValue = "before_load"
 		return nil
 	}
-	alfn := func(ctx context.Context, cfg config.Config) error {
+	alfn := func(_ context.Context, c config.Config) error {
-		nconf, ok := cfg.Options().Struct.(*Cfg)
+		nconf, ok := c.Options().Struct.(*cfg)
 		if !ok {
-			return fmt.Errorf("failed to get Struct from options: %v", cfg.Options())
+			return fmt.Errorf("failed to get Struct from options: %v", c.Options())
 		}
 		nconf.StringValue = "after_load"
 		return nil
@@ -47,6 +100,37 @@ func TestDefault(t *testing.T) {
 	if conf.StringValue != "after_load" {
 		t.Fatal("AfterLoad option not working")
 	}
+	if len(conf.MapValue) != 2 {
+		t.Fatalf("map value invalid: %#+v\n", conf.MapValue)
+	}
+
+	if conf.UUIDValue == "" {
+		t.Fatalf("uuid value empty")
+	} else if len(conf.UUIDValue) != 36 {
+		t.Fatalf("uuid value invalid: %s", conf.UUIDValue)
+	}
+
+	if conf.IDValue == "" {
+		t.Fatalf("id value empty")
+	} else if len(conf.IDValue) != mid.DefaultSize {
+		t.Fatalf("id value invalid: %s", conf.IDValue)
+	}
 	_ = conf
 	// t.Logf("%#+v\n", conf)
 }
+
+func TestValidate(t *testing.T) {
+	ctx := context.Background()
+	conf := &cfg{IntValue: 10}
+	cfg := config.NewConfig(config.Struct(conf))
+	if err := cfg.Init(); err != nil {
+		t.Fatal(err)
+	}
+	if err := cfg.Load(ctx); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := config.Validate(ctx, conf); err != nil {
+		t.Fatal(err)
+	}
+}

config/options.go

@@ -7,6 +7,7 @@ import (
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/logger"
 	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/tracer"
 )
 
@@ -28,16 +29,26 @@ type Options struct {
 	Name string
 	// StructTag name
 	StructTag string
-	// BeforeSave contains slice of funcs that runs before save
+	// BeforeSave contains slice of funcs that runs before Save
 	BeforeSave []func(context.Context, Config) error
-	// AfterLoad contains slice of funcs that runs after load
+	// AfterSave contains slice of funcs that runs after Save
-	AfterLoad []func(context.Context, Config) error
-	// BeforeLoad contains slice of funcs that runs before load
-	BeforeLoad []func(context.Context, Config) error
-	// AfterSave contains slice of funcs that runs after save
 	AfterSave []func(context.Context, Config) error
+	// BeforeLoad contains slice of funcs that runs before Load
+	BeforeLoad []func(context.Context, Config) error
+	// AfterLoad contains slice of funcs that runs after Load
+	AfterLoad []func(context.Context, Config) error
+	// BeforeInit contains slice of funcs that runs before Init
+	BeforeInit []func(context.Context, Config) error
+	// AfterInit contains slice of funcs that runs after Init
+	AfterInit []func(context.Context, Config) error
 	// AllowFail flag to allow fail in config source
 	AllowFail bool
+	// SkipLoad runs only if condition returns true
+	SkipLoad func(context.Context, Config) bool
+	// SkipSave runs only if condition returns true
+	SkipSave func(context.Context, Config) bool
+	// Hooks can be run before/after config Save/Load
+	Hooks options.Hooks
 }
 
 // Option function signature
@@ -64,11 +75,12 @@ type LoadOption func(o *LoadOptions)
 // LoadOptions struct
 type LoadOptions struct {
 	Struct   interface{}
+	Context  context.Context
 	Override bool
 	Append   bool
-	Context  context.Context
 }
 
+// NewLoadOptions create LoadOptions struct with provided opts
 func NewLoadOptions(opts ...LoadOption) LoadOptions {
 	options := LoadOptions{}
 	for _, o := range opts {
@@ -130,6 +142,20 @@ func AllowFail(b bool) Option {
 	}
 }
 
+// BeforeInit run funcs before config Init
+func BeforeInit(fn ...func(context.Context, Config) error) Option {
+	return func(o *Options) {
+		o.BeforeInit = fn
+	}
+}
+
+// AfterInit run funcs after config Init
+func AfterInit(fn ...func(context.Context, Config) error) Option {
+	return func(o *Options) {
+		o.AfterInit = fn
+	}
+}
+
 // BeforeLoad run funcs before config load
 func BeforeLoad(fn ...func(context.Context, Config) error) Option {
 	return func(o *Options) {
@@ -221,8 +247,10 @@ type WatchOptions struct {
 	Coalesce bool
 }
 
+// WatchOption func signature
 type WatchOption func(*WatchOptions)
 
+// NewWatchOptions create WatchOptions struct with provided opts
 func NewWatchOptions(opts ...WatchOption) WatchOptions {
 	options := WatchOptions{
 		Context:     context.Background(),
@@ -263,3 +291,10 @@ func WatchStruct(src interface{}) WatchOption {
 		o.Struct = src
 	}
 }
+
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
+	return func(o *Options) {
+		o.Hooks = append(o.Hooks, h...)
+	}
+}

context_test.go

@@ -0,0 +1,24 @@
+package micro
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), serviceKey{}, NewService())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewService())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}

database/dsn.go

@@ -0,0 +1,157 @@
+package database
+
+import (
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+)
+
+var (
+	ErrInvalidDSNAddr      = errors.New("invalid dsn addr")
+	ErrInvalidDSNUnescaped = errors.New("dsn must be escaped")
+	ErrInvalidDSNNoSlash   = errors.New("dsn must contains slash")
+)
+
+type Config struct {
+	TLSConfig *tls.Config
+	Username  string
+	Password  string
+	Scheme    string
+	Host      string
+	Port      string
+	Database  string
+	Params    []string
+}
+
+func (cfg *Config) FormatDSN() string {
+	var s strings.Builder
+
+	if len(cfg.Scheme) > 0 {
+		s.WriteString(cfg.Scheme + "://")
+	}
+	// [username[:password]@]
+	if len(cfg.Username) > 0 {
+		s.WriteString(cfg.Username)
+		if len(cfg.Password) > 0 {
+			s.WriteByte(':')
+			s.WriteString(url.PathEscape(cfg.Password))
+		}
+		s.WriteByte('@')
+	}
+
+	// [host:port]
+	if len(cfg.Host) > 0 {
+		s.WriteString(cfg.Host)
+		if len(cfg.Port) > 0 {
+			s.WriteByte(':')
+			s.WriteString(cfg.Port)
+		}
+	}
+
+	// /dbname
+	s.WriteByte('/')
+	s.WriteString(url.PathEscape(cfg.Database))
+
+	for i := 0; i < len(cfg.Params); i += 2 {
+		if i == 0 {
+			s.WriteString("?")
+		} else {
+			s.WriteString("&")
+		}
+		s.WriteString(cfg.Params[i])
+		s.WriteString("=")
+		s.WriteString(cfg.Params[i+1])
+	}
+
+	return s.String()
+}
+
+func ParseDSN(dsn string) (*Config, error) {
+	cfg := &Config{}
+
+	// [user[:password]@][net[(addr)]]/dbname[?param1=value1&paramN=valueN]
+	// Find last '/' that goes before dbname
+	foundSlash := false
+	for i := len(dsn) - 1; i >= 0; i-- {
+		if dsn[i] == '/' {
+			foundSlash = true
+			var j, k int
+
+			// left part is empty if i <= 0
+			if i > 0 {
+				// Find the first ':' in dsn
+				for j = i; j >= 0; j-- {
+					if dsn[j] == ':' {
+						cfg.Scheme = dsn[0:j]
+					}
+				}
+
+				// [username[:password]@][host]
+				// Find the last '@' in dsn[:i]
+				for j = i; j >= 0; j-- {
+					if dsn[j] == '@' {
+						// username[:password]
+						// Find the second ':' in dsn[:j]
+						for k = 0; k < j; k++ {
+							if dsn[k] == ':' {
+								if cfg.Scheme == dsn[:k] {
+									continue
+								}
+								var err error
+								cfg.Password, err = url.PathUnescape(dsn[k+1 : j])
+								if err != nil {
+									return nil, err
+								}
+								break
+							}
+						}
+						cfg.Username = dsn[len(cfg.Scheme)+3 : k]
+						break
+					}
+				}
+
+				for k = j + 1; k < i; k++ {
+					if dsn[k] == ':' {
+						cfg.Host = dsn[j+1 : k]
+						cfg.Port = dsn[k+1 : i]
+						break
+					}
+				}
+
+			}
+
+			// dbname[?param1=value1&...&paramN=valueN]
+			// Find the first '?' in dsn[i+1:]
+			for j = i + 1; j < len(dsn); j++ {
+				if dsn[j] == '?' {
+					parts := strings.Split(dsn[j+1:], "&")
+					cfg.Params = make([]string, 0, len(parts)*2)
+					for _, p := range parts {
+						k, v, found := strings.Cut(p, "=")
+						if !found {
+							continue
+						}
+						cfg.Params = append(cfg.Params, k, v)
+					}
+
+					break
+				}
+			}
+			var err error
+			dbname := dsn[i+1 : j]
+			if cfg.Database, err = url.PathUnescape(dbname); err != nil {
+				return nil, fmt.Errorf("invalid dbname %q: %w", dbname, err)
+			}
+
+			break
+		}
+	}
+
+	if !foundSlash && len(dsn) > 0 {
+		return nil, ErrInvalidDSNNoSlash
+	}
+
+	return cfg, nil
+}

database/dsn_test.go

@@ -0,0 +1,31 @@
+package database
+
+import (
+	"net/url"
+	"testing"
+)
+
+func TestParseDSN(t *testing.T) {
+	cfg, err := ParseDSN("postgres://username:p@ssword#@host:12345/dbname?key1=val2&key2=val2")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cfg.Password != "p@ssword#" {
+		t.Fatalf("parsing error")
+	}
+}
+
+func TestFormatDSN(t *testing.T) {
+	src := "postgres://username:p@ssword#@host:12345/dbname?key1=val2&key2=val2"
+	cfg, err := ParseDSN(src)
+	if err != nil {
+		t.Fatal(err)
+	}
+	dst, err := url.PathUnescape(cfg.FormatDSN())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if src != dst {
+		t.Fatalf("\n%s\n%s", src, dst)
+	}
+}

errors/errors.go

@@ -1,11 +1,20 @@
 // Package errors provides a way to return detailed information
 // for an RPC request error. The error is normally JSON encoded.
-package errors // import "go.unistack.org/micro/v3/errors"
+package errors
 
 import (
+	"bytes"
+	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
+	"io"
 	"net/http"
+	"strconv"
+	"strings"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 )
 
 var (
@@ -35,6 +44,20 @@ var (
 	ErrGatewayTimeout = &Error{Code: 504}
 )
 
+const ProblemContentType = "application/problem+json"
+
+type Problem struct {
+	Type     string `json:"type,omitempty"`
+	Title    string `json:"title,omitempty"`
+	Detail   string `json:"detail,omitempty"`
+	Instance string `json:"instance,omitempty"`
+	Errors   []struct {
+		Title  string `json:"title,omitempty"`
+		Detail string `json:"detail,omitempty"`
+	} `json:"errors,omitempty"`
+	Status int `json:"status,omitempty"`
+}
+
 // Error type
 type Error struct {
 	// ID holds error id or service, usually someting like my_service or id
@@ -53,6 +76,22 @@ func (e *Error) Error() string {
 	return string(b)
 }
 
+/*
+// Generator struct holds id of error
+type Generator struct {
+	id string
+}
+
+// Generator can emit new error with static id
+func NewGenerator(id string) *Generator {
+	return &Generator{id: id}
+}
+
+func (g *Generator) BadRequest(format string, args ...interface{}) error {
+	return BadRequest(g.id, format, args...)
+}
+*/
+
 // New generates a custom error
 func New(id, detail string, code int32) error {
 	return &Error{
@@ -66,130 +105,130 @@ func New(id, detail string, code int32) error {
 // Parse tries to parse a JSON string into an error. If that
 // fails, it will set the given string as the error detail.
 func Parse(err string) *Error {
-	e := new(Error)
+	e := &Error{}
-	errr := json.Unmarshal([]byte(err), e)
+	nerr := json.Unmarshal([]byte(err), e)
-	if errr != nil {
+	if nerr != nil {
 		e.Detail = err
 	}
 	return e
 }
 
 // BadRequest generates a 400 error.
-func BadRequest(id, format string, a ...interface{}) error {
+func BadRequest(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   400,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(400),
 	}
 }
 
 // Unauthorized generates a 401 error.
-func Unauthorized(id, format string, a ...interface{}) error {
+func Unauthorized(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   401,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(401),
 	}
 }
 
 // Forbidden generates a 403 error.
-func Forbidden(id, format string, a ...interface{}) error {
+func Forbidden(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   403,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(403),
 	}
 }
 
 // NotFound generates a 404 error.
-func NotFound(id, format string, a ...interface{}) error {
+func NotFound(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   404,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(404),
 	}
 }
 
 // MethodNotAllowed generates a 405 error.
-func MethodNotAllowed(id, format string, a ...interface{}) error {
+func MethodNotAllowed(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   405,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(405),
 	}
 }
 
 // Timeout generates a 408 error.
-func Timeout(id, format string, a ...interface{}) error {
+func Timeout(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   408,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(408),
 	}
 }
 
 // Conflict generates a 409 error.
-func Conflict(id, format string, a ...interface{}) error {
+func Conflict(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   409,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(409),
 	}
 }
 
 // InternalServerError generates a 500 error.
-func InternalServerError(id, format string, a ...interface{}) error {
+func InternalServerError(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   500,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(500),
 	}
 }
 
 // NotImplemented generates a 501 error
-func NotImplemented(id, format string, a ...interface{}) error {
+func NotImplemented(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   501,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(501),
 	}
 }
 
 // BadGateway generates a 502 error
-func BadGateway(id, format string, a ...interface{}) error {
+func BadGateway(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   502,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(502),
 	}
 }
 
 // ServiceUnavailable generates a 503 error
-func ServiceUnavailable(id, format string, a ...interface{}) error {
+func ServiceUnavailable(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   503,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(503),
 	}
 }
 
 // GatewayTimeout generates a 504 error
-func GatewayTimeout(id, format string, a ...interface{}) error {
+func GatewayTimeout(id, format string, args ...interface{}) error {
 	return &Error{
 		ID:     id,
 		Code:   504,
-		Detail: fmt.Sprintf(format, a...),
+		Detail: fmt.Sprintf(format, args...),
 		Status: http.StatusText(504),
 	}
 }
@@ -214,11 +253,246 @@ func Equal(err1 error, err2 error) bool {
 	return true
 }
 
+// CodeIn return true if err has specified code
+func CodeIn(err interface{}, codes ...int32) bool {
+	var code int32
+	switch verr := err.(type) {
+	case *Error:
+		code = verr.Code
+	case int32:
+		code = verr
+	default:
+		return false
+	}
+
+	for _, check := range codes {
+		if code == check {
+			return true
+		}
+	}
+
+	return false
+}
+
 // FromError try to convert go error to *Error
 func FromError(err error) *Error {
+	if err == nil {
+		return nil
+	}
+
 	if verr, ok := err.(*Error); ok && verr != nil {
 		return verr
 	}
 
 	return Parse(err.Error())
 }
+
+// MarshalJSON returns error data
+func (e *Error) MarshalJSON() ([]byte, error) {
+	return e.Marshal()
+}
+
+// UnmarshalJSON set error data
+func (e *Error) UnmarshalJSON(data []byte) error {
+	return e.Unmarshal(data)
+}
+
+// ProtoMessage noop func
+func (e *Error) ProtoMessage() {}
+
+// Reset resets error
+func (e *Error) Reset() {
+	*e = Error{}
+}
+
+// String returns error as string
+func (e *Error) String() string {
+	return fmt.Sprintf(`{"id":"%s","detail":"%s","status":"%s","code":%d}`, addslashes(e.ID), addslashes(e.Detail), addslashes(e.Status), e.Code)
+}
+
+// Marshal returns error data
+func (e *Error) Marshal() ([]byte, error) {
+	return []byte(e.String()), nil
+}
+
+// Unmarshal set error data
+func (e *Error) Unmarshal(data []byte) error {
+	str := string(data)
+	if len(data) < 41 {
+		return fmt.Errorf("invalid data")
+	}
+	parts := strings.FieldsFunc(str[1:len(str)-1], func(r rune) bool {
+		return r == ','
+	})
+	for _, part := range parts {
+		nparts := strings.FieldsFunc(part, func(r rune) bool {
+			return r == ':'
+		})
+		for idx := 0; idx < len(nparts)/2; idx += 2 {
+			val := strings.Trim(nparts[idx+1], `"`)
+			if len(val) == 0 {
+				continue
+			}
+			switch {
+			case nparts[idx] == `"id"`:
+				e.ID = val
+			case nparts[idx] == `"detail"`:
+				e.Detail = val
+			case nparts[idx] == `"status"`:
+				e.Status = val
+			case nparts[idx] == `"code"`:
+				c, err := strconv.ParseInt(val, 10, 32)
+				if err != nil {
+					return err
+				}
+				e.Code = int32(c)
+			}
+			idx++
+		}
+	}
+	return nil
+}
+
+func addslashes(str string) string {
+	var buf bytes.Buffer
+	for _, char := range str {
+		switch char {
+		case '\'', '"', '\\':
+			buf.WriteRune('\\')
+		}
+		buf.WriteRune(char)
+	}
+	return buf.String()
+}
+
+type retryableError struct {
+	err error
+}
+
+// Retryable returns error that can be retried later
+func Retryable(err error) error {
+	return &retryableError{err: err}
+}
+
+type IsRetryableFunc func(error) bool
+
+var (
+	RetrayableOracleErrors = []IsRetryableFunc{
+		func(err error) bool {
+			errmsg := err.Error()
+			switch {
+			case strings.Contains(errmsg, `ORA-`):
+				return true
+			case strings.Contains(errmsg, `can not assign`):
+				return true
+			case strings.Contains(errmsg, `can't assign`):
+				return true
+			}
+			return false
+		},
+	}
+	RetrayablePostgresErrors = []IsRetryableFunc{
+		func(err error) bool {
+			errmsg := err.Error()
+			switch {
+			case strings.Contains(errmsg, `number of field descriptions must equal number of`):
+				return true
+			case strings.Contains(errmsg, `not a pointer`):
+				return true
+			case strings.Contains(errmsg, `values, but dst struct has only`):
+				return true
+			case strings.Contains(errmsg, `struct doesn't have corresponding row field`):
+				return true
+			case strings.Contains(errmsg, `cannot find field`):
+				return true
+			case strings.Contains(errmsg, `cannot scan`) || strings.Contains(errmsg, `cannot convert`):
+				return true
+			case strings.Contains(errmsg, `failed to connect to`):
+				return true
+			}
+			return false
+		},
+	}
+	RetryableMicroErrors = []IsRetryableFunc{
+		func(err error) bool {
+			switch verr := err.(type) {
+			case *Error:
+				switch verr.Code {
+				case 401, 403, 408, 500, 501, 502, 503, 504:
+					return true
+				default:
+					return false
+				}
+			case *retryableError:
+				return true
+			}
+			return false
+		},
+	}
+	RetryableGoErrors = []IsRetryableFunc{
+		func(err error) bool {
+			switch verr := err.(type) {
+			case interface{ SafeToRetry() bool }:
+				return verr.SafeToRetry()
+			case interface{ Timeout() bool }:
+				return verr.Timeout()
+			}
+			switch {
+			case errors.Is(err, io.EOF), errors.Is(err, io.ErrUnexpectedEOF):
+				return true
+			case errors.Is(err, context.DeadlineExceeded):
+				return true
+			case errors.Is(err, io.ErrClosedPipe), errors.Is(err, io.ErrShortBuffer), errors.Is(err, io.ErrShortWrite):
+				return true
+			}
+			return false
+		},
+	}
+	RetryableGrpcErrors = []IsRetryableFunc{
+		func(err error) bool {
+			st, ok := status.FromError(err)
+			if !ok {
+				return false
+			}
+			switch st.Code() {
+			case codes.Unavailable, codes.ResourceExhausted:
+				return true
+			case codes.DeadlineExceeded:
+				return true
+			case codes.Internal:
+				switch {
+				case strings.Contains(st.Message(), `transport: received the unexpected content-type "text/html; charset=UTF-8"`):
+					return true
+				case strings.Contains(st.Message(), io.ErrUnexpectedEOF.Error()):
+					return true
+				case strings.Contains(st.Message(), `stream terminated by RST_STREAM with error code: INTERNAL_ERROR`):
+					return true
+				}
+			}
+			return false
+		},
+	}
+)
+
+// Unwrap provides error wrapping
+func (e *retryableError) Unwrap() error {
+	return e.err
+}
+
+// Error returns the error string
+func (e *retryableError) Error() string {
+	if e.err == nil {
+		return ""
+	}
+	return e.err.Error()
+}
+
+// IsRetryable checks error for ability to retry later
+func IsRetryable(err error, fns ...IsRetryableFunc) bool {
+	for _, fn := range fns {
+		if ok := fn(err); ok {
+			return true
+		}
+	}
+	return false
+}

errors/errors.proto

@@ -0,0 +1,31 @@
+// Copyright 2021 Unistack LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package micro.errors;
+
+option cc_enable_arenas = true;
+option go_package = "go.unistack.org/micro/v3/errors;errors";
+option java_multiple_files = true;
+option java_outer_classname = "MicroErrors";
+option java_package = "micro.errors";
+option objc_class_prefix = "MERRORS";
+
+message Error {
+  string id = 1;
+  string detail = 2;
+  string status = 3;
+  uint32 code = 4;
+}

errors/errors_test.go

@@ -1,11 +1,41 @@
 package errors
 
 import (
+	"encoding/json"
 	er "errors"
+	"fmt"
 	"net/http"
 	"testing"
 )
 
+func TestIsRetrayable(t *testing.T) {
+	err := fmt.Errorf("ORA-")
+	if !IsRetryable(err, RetrayableOracleErrors...) {
+		t.Fatalf("IsRetrayable not works")
+	}
+}
+
+func TestMarshalJSON(t *testing.T) {
+	e := InternalServerError("id", "err: %v", fmt.Errorf("err: %v", `xxx: "UNIX_TIMESTAMP": invalid identifier`))
+	_, err := json.Marshal(e)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestEmpty(t *testing.T) {
+	msg := "test"
+	var err *Error
+	err = FromError(fmt.Errorf(msg))
+	if err.Detail != msg {
+		t.Fatalf("invalid error %v", err)
+	}
+	err = FromError(fmt.Errorf(`{"id":"","detail":"%s","status":"%s","code":0}`, msg, msg))
+	if err.Detail != msg || err.Status != msg {
+		t.Fatalf("invalid error %#+v", err)
+	}
+}
+
 func TestFromError(t *testing.T) {
 	err := NotFound("go.micro.test", "%s", "example")
 	merr := FromError(err)
@@ -73,3 +103,19 @@ func TestErrors(t *testing.T) {
 		}
 	}
 }
+
+func TestCodeIn(t *testing.T) {
+	err := InternalServerError("id", "%s", "msg")
+
+	if ok := CodeIn(err, 400, 500); !ok {
+		t.Fatalf("CodeIn not works: %v", err)
+	}
+
+	if ok := CodeIn(err.(*Error).Code, 500); !ok {
+		t.Fatalf("CodeIn not works: %v", err)
+	}
+
+	if ok := CodeIn(err, 100); ok {
+		t.Fatalf("CodeIn not works: %v", err)
+	}
+}

flow/context_test.go

@@ -0,0 +1,53 @@
+package flow
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromNilContext(t *testing.T) {
+	// nolint: staticcheck
+	c, ok := FromContext(nil)
+	if ok || c != nil {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewNilContext(t *testing.T) {
+	// nolint: staticcheck
+	ctx := NewContext(nil, NewFlow())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), flowKey{}, NewFlow())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewFlow())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestSetOption(t *testing.T) {
+	type key struct{}
+	o := SetOption(key{}, "test")
+	opts := &Options{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetOption not works")
+	}
+}

flow/dag_test.go

@@ -7,6 +7,56 @@ import (
 	"github.com/silas/dag"
 )
 
+func TestDeps(t *testing.T) {
+	t.Skip()
+	d := &dag.AcyclicGraph{}
+
+	v0 := d.Add(&node{"v0"})
+	v1 := d.Add(&node{"v1"})
+	v2 := d.Add(&node{"v2"})
+	v3 := d.Add(&node{"v3"})
+	v4 := d.Add(&node{"v4"})
+
+	d.Connect(dag.BasicEdge(v0, v1))
+	d.Connect(dag.BasicEdge(v1, v2))
+	d.Connect(dag.BasicEdge(v2, v4))
+	d.Connect(dag.BasicEdge(v0, v3))
+	d.Connect(dag.BasicEdge(v3, v4))
+
+	if err := d.Validate(); err != nil {
+		t.Fatal(err)
+	}
+
+	d.TransitiveReduction()
+
+	var steps [][]string
+	fn := func(n dag.Vertex, idx int) error {
+		if idx == 0 {
+			steps = make([][]string, 1)
+			steps[0] = make([]string, 0, 1)
+		} else if idx >= len(steps) {
+			tsteps := make([][]string, idx+1)
+			copy(tsteps, steps)
+			steps = tsteps
+			steps[idx] = make([]string, 0, 1)
+		}
+		steps[idx] = append(steps[idx], fmt.Sprintf("%s", n))
+		return nil
+	}
+
+	start := &node{"v0"}
+	err := d.SortedDepthFirstWalk([]dag.Vertex{start}, fn)
+	checkErr(t, err)
+
+	for idx, steps := range steps {
+		fmt.Printf("level %d steps %#+v\n", idx, steps)
+	}
+
+	if len(steps[2]) != 1 {
+		t.Logf("invalid steps %#+v", steps[2])
+	}
+}
+
 func checkErr(t *testing.T, err error) {
 	if err != nil {
 		t.Fatal(err)

flow/default.go

@@ -3,7 +3,6 @@ package flow
 import (
 	"context"
 	"fmt"
-	"path/filepath"
 	"sync"
 
 	"github.com/silas/dag"
@@ -150,17 +149,17 @@ func (w *microWorkflow) getSteps(start string, reverse bool) ([][]Step, error) {
 }
 
 func (w *microWorkflow) Abort(ctx context.Context, id string) error {
-	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
+	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+id)
 	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusAborted.String())})
 }
 
 func (w *microWorkflow) Suspend(ctx context.Context, id string) error {
-	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
+	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+id)
 	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusSuspend.String())})
 }
 
 func (w *microWorkflow) Resume(ctx context.Context, id string) error {
-	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
+	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+id)
 	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusRunning.String())})
 }
 
@@ -181,15 +180,15 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 		return "", err
 	}
 
-	stepStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("steps", eid))
+	stepStore := store.NewNamespaceStore(w.opts.Store, "steps"+w.opts.Store.Options().Separator+eid)
-	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", eid))
+	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+eid)
 
 	options := NewExecuteOptions(opts...)
 
 	steps, err := w.getSteps(options.Start, options.Reverse)
 	if err != nil {
 		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusPending.String())}); werr != nil {
-			w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+			w.opts.Logger.Error(w.opts.Context, "store write error", werr)
 		}
 		return "", err
 	}
@@ -213,13 +212,13 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 	done := make(chan struct{})
 
 	if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
-		w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+		w.opts.Logger.Error(w.opts.Context, "store write error", werr)
 		return eid, werr
 	}
 	for idx := range steps {
 		for nidx := range steps[idx] {
 			cstep := steps[idx][nidx]
-			if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusPending.String())}); werr != nil {
+			if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusPending.String())}); werr != nil {
 				return eid, werr
 			}
 		}
@@ -238,7 +237,7 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 					return
 				}
 				if w.opts.Logger.V(logger.TraceLevel) {
-					w.opts.Logger.Tracef(nctx, "will be executed %v", steps[idx][nidx])
+					w.opts.Logger.Trace(nctx, fmt.Sprintf("will be executed %v", steps[idx][nidx]))
 				}
 				cstep := steps[idx][nidx]
 				// nolint: nestif
@@ -246,65 +245,65 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 					wg.Add(1)
 					go func(step Step) {
 						defer wg.Done()
-						if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "req"), req); werr != nil {
+						if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"req", req); werr != nil {
 							cherr <- werr
 							return
 						}
-						if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "status"), &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
+						if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
 							cherr <- werr
 							return
 						}
 						rsp, serr := step.Execute(nctx, req, nopts...)
 						if serr != nil {
 							step.SetStatus(StatusFailure)
-							if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "rsp"), serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
+							if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"rsp", serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
-								w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+								w.opts.Logger.Error(ctx, "store write error", werr)
 							}
-							if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "status"), &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
+							if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
-								w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+								w.opts.Logger.Error(ctx, "store write error", werr)
 							}
 							cherr <- serr
 							return
 						}
-						if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "rsp"), rsp); werr != nil {
+						if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"rsp", rsp); werr != nil {
-							w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+							w.opts.Logger.Error(ctx, "store write error", werr)
 							cherr <- werr
 							return
 						}
-						if werr := stepStore.Write(ctx, filepath.Join(step.ID(), "status"), &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
+						if werr := stepStore.Write(ctx, step.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
-							w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+							w.opts.Logger.Error(ctx, "store write error", werr)
 							cherr <- werr
 							return
 						}
 					}(cstep)
 					wg.Wait()
 				} else {
-					if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "req"), req); werr != nil {
+					if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"req", req); werr != nil {
 						cherr <- werr
 						return
 					}
-					if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
+					if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusRunning.String())}); werr != nil {
 						cherr <- werr
 						return
 					}
 					rsp, serr := cstep.Execute(nctx, req, nopts...)
 					if serr != nil {
 						cstep.SetStatus(StatusFailure)
-						if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "rsp"), serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
+						if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"rsp", serr); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
-							w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+							w.opts.Logger.Error(ctx, "store write error", werr)
 						}
-						if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
+						if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil && w.opts.Logger.V(logger.ErrorLevel) {
-							w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+							w.opts.Logger.Error(ctx, "store write error", werr)
 						}
 						cherr <- serr
 						return
 					}
-					if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "rsp"), rsp); werr != nil {
+					if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"rsp", rsp); werr != nil {
-						w.opts.Logger.Errorf(ctx, "store write error: %v", werr)
+						w.opts.Logger.Error(ctx, "store write error", werr)
 						cherr <- werr
 						return
 					}
-					if werr := stepStore.Write(ctx, filepath.Join(cstep.ID(), "status"), &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
+					if werr := stepStore.Write(ctx, cstep.ID()+w.opts.Store.Options().Separator+"status", &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
 						cherr <- werr
 						return
 					}
@@ -318,7 +317,7 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 		return eid, nil
 	}
 
-	logger.Tracef(ctx, "wait for finish or error")
+	logger.DefaultLogger.Trace(ctx, "wait for finish or error")
 	select {
 	case <-nctx.Done():
 		err = nctx.Err()
@@ -334,21 +333,22 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 	switch {
 	case nctx.Err() != nil:
 		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusAborted.String())}); werr != nil {
-			w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+			w.opts.Logger.Error(w.opts.Context, "store write error", werr)
 		}
 	case err == nil:
 		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusSuccess.String())}); werr != nil {
-			w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+			w.opts.Logger.Error(w.opts.Context, "store write error", werr)
 		}
 	case err != nil:
 		if werr := workflowStore.Write(w.opts.Context, "status", &codec.Frame{Data: []byte(StatusFailure.String())}); werr != nil {
-			w.opts.Logger.Errorf(w.opts.Context, "store error: %v", werr)
+			w.opts.Logger.Error(w.opts.Context, "store write error", werr)
 		}
 	}
 
 	return eid, err
 }
 
+// NewFlow create new flow
 func NewFlow(opts ...Option) Flow {
 	options := NewOptions(opts...)
 	return &microFlow{opts: options}
@@ -574,11 +574,13 @@ func (s *microPublishStep) Execute(ctx context.Context, req *Message, opts ...Ex
 	return nil, nil
 }
 
+// NewCallStep create new step with client.Call
 func NewCallStep(service string, name string, method string, opts ...StepOption) Step {
 	options := NewStepOptions(opts...)
 	return &microCallStep{service: service, method: name + "." + method, opts: options}
 }
 
+// NewPublishStep create new step with client.Publish
 func NewPublishStep(topic string, opts ...StepOption) Step {
 	options := NewStepOptions(opts...)
 	return &microPublishStep{topic: topic, opts: options}

flow/flow.go

@@ -1,5 +1,5 @@
 // Package flow is an interface used for saga pattern microservice workflow
-package flow // import "go.unistack.org/micro/v3/flow"
+package flow
 
 import (
 	"context"
@@ -11,7 +11,9 @@ import (
 )
 
 var (
+	// ErrStepNotExists returns when step not found
 	ErrStepNotExists = errors.New("step not exists")
+	// ErrMissingClient returns when client.Client is missing
 	ErrMissingClient = errors.New("client not set")
 )
 
@@ -36,6 +38,7 @@ func (m *RawMessage) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+// Message used to transfer data between steps
 type Message struct {
 	Header metadata.Metadata
 	Body   RawMessage
@@ -67,6 +70,7 @@ type Step interface {
 	Response() *Message
 }
 
+// Status contains step current status
 type Status int
 
 func (status Status) String() string {
@@ -74,15 +78,22 @@ func (status Status) String() string {
 }
 
 const (
+	// StatusPending step waiting to start
 	StatusPending Status = iota
+	// StatusRunning step is running
 	StatusRunning
+	// StatusFailure step competed with error
 	StatusFailure
+	// StatusSuccess step completed without error
 	StatusSuccess
+	// StatusAborted step aborted while it running
 	StatusAborted
+	// StatusSuspend step suspended
 	StatusSuspend
 )
 
 var (
+	// StatusString contains map status => string
 	StatusString = map[Status]string{
 		StatusPending: "StatusPending",
 		StatusRunning: "StatusRunning",
@@ -91,6 +102,7 @@ var (
 		StatusAborted: "StatusAborted",
 		StatusSuspend: "StatusSuspend",
 	}
+	// StringStatus contains map string => status
 	StringStatus = map[string]Status{
 		"StatusPending": StatusPending,
 		"StatusRunning": StatusRunning,
@@ -144,6 +156,7 @@ var (
 	atomicSteps atomic.Value
 )
 
+// RegisterStep register own step with workflow
 func RegisterStep(step Step) {
 	flowMu.Lock()
 	steps, _ := atomicSteps.Load().([]Step)

flow/options.go

@@ -70,7 +70,7 @@ func Client(c client.Client) Option {
 
 // Context specifies a context for the service.
 // Can be used to signal shutdown of the flow
-// Can be used for extra option values.
+// or can be used for extra option values.
 func Context(ctx context.Context) Option {
 	return func(o *Options) {
 		o.Context = ctx
@@ -91,7 +91,7 @@ func Store(s store.Store) Option {
 	}
 }
 
-// WorflowOption signature
+// WorkflowOption func signature
 type WorkflowOption func(*WorkflowOptions)
 
 // WorkflowOptions holds workflow options
@@ -107,6 +107,7 @@ func WorkflowID(id string) WorkflowOption {
 	}
 }
 
+// ExecuteOptions holds execute options
 type ExecuteOptions struct {
 	// Client holds the client.Client
 	Client client.Client
@@ -128,56 +129,66 @@ type ExecuteOptions struct {
 	Async bool
 }
 
+// ExecuteOption func signature
 type ExecuteOption func(*ExecuteOptions)
 
+// ExecuteClient pass client.Client to ExecuteOption
 func ExecuteClient(c client.Client) ExecuteOption {
 	return func(o *ExecuteOptions) {
 		o.Client = c
 	}
 }
 
+// ExecuteTracer pass tracer.Tracer to ExecuteOption
 func ExecuteTracer(t tracer.Tracer) ExecuteOption {
 	return func(o *ExecuteOptions) {
 		o.Tracer = t
 	}
 }
 
+// ExecuteLogger pass logger.Logger to ExecuteOption
 func ExecuteLogger(l logger.Logger) ExecuteOption {
 	return func(o *ExecuteOptions) {
 		o.Logger = l
 	}
 }
 
+// ExecuteMeter pass meter.Meter to ExecuteOption
 func ExecuteMeter(m meter.Meter) ExecuteOption {
 	return func(o *ExecuteOptions) {
 		o.Meter = m
 	}
 }
 
+// ExecuteContext pass context.Context ot ExecuteOption
 func ExecuteContext(ctx context.Context) ExecuteOption {
 	return func(o *ExecuteOptions) {
 		o.Context = ctx
 	}
 }
 
+// ExecuteReverse says that dag must be run in reverse order
 func ExecuteReverse(b bool) ExecuteOption {
 	return func(o *ExecuteOptions) {
 		o.Reverse = b
 	}
 }
 
+// ExecuteTimeout pass timeout time.Duration for execution
 func ExecuteTimeout(td time.Duration) ExecuteOption {
 	return func(o *ExecuteOptions) {
 		o.Timeout = td
 	}
 }
 
+// ExecuteAsync says that caller does not wait for execution complete
 func ExecuteAsync(b bool) ExecuteOption {
 	return func(o *ExecuteOptions) {
 		o.Async = b
 	}
 }
 
+// NewExecuteOptions create new ExecuteOptions struct
 func NewExecuteOptions(opts ...ExecuteOption) ExecuteOptions {
 	options := ExecuteOptions{
 		Client:  client.DefaultClient,
@@ -192,6 +203,7 @@ func NewExecuteOptions(opts ...ExecuteOption) ExecuteOptions {
 	return options
 }
 
+// StepOptions holds step options
 type StepOptions struct {
 	Context  context.Context
 	Fallback string
@@ -199,8 +211,10 @@ type StepOptions struct {
 	Requires []string
 }
 
+// StepOption func signature
 type StepOption func(*StepOptions)
 
+// NewStepOptions create new StepOptions struct
 func NewStepOptions(opts ...StepOption) StepOptions {
 	options := StepOptions{
 		Context: context.Background(),
@@ -211,18 +225,21 @@ func NewStepOptions(opts ...StepOption) StepOptions {
 	return options
 }
 
+// StepID sets the step id for dag
 func StepID(id string) StepOption {
 	return func(o *StepOptions) {
 		o.ID = id
 	}
 }
 
+// StepRequires specifies required steps
 func StepRequires(steps ...string) StepOption {
 	return func(o *StepOptions) {
 		o.Requires = steps
 	}
 }
 
+// StepFallback set the step to run on error
 func StepFallback(step string) StepOption {
 	return func(o *StepOptions) {
 		o.Fallback = step

fsm/default.go

@@ -0,0 +1,126 @@
+package fsm
+
+import (
+	"context"
+	"fmt"
+	"sync"
+)
+
+type state struct {
+	body interface{}
+	name string
+}
+
+var _ State = &state{}
+
+func (s *state) Name() string {
+	return s.name
+}
+
+func (s *state) Body() interface{} {
+	return s.body
+}
+
+// fsm is a finite state machine
+type fsm struct {
+	statesMap   map[string]StateFunc
+	current     string
+	statesOrder []string
+	opts        Options
+	mu          sync.Mutex
+}
+
+// NewFSM creates a new finite state machine having the specified initial state
+// with specified options
+func NewFSM(opts ...Option) *fsm {
+	return &fsm{
+		statesMap: map[string]StateFunc{},
+		opts:      NewOptions(opts...),
+	}
+}
+
+// Current returns the current state
+func (f *fsm) Current() string {
+	f.mu.Lock()
+	s := f.current
+	f.mu.Unlock()
+	return s
+}
+
+// Current returns the current state
+func (f *fsm) Reset() {
+	f.mu.Lock()
+	f.current = f.opts.Initial
+	f.mu.Unlock()
+}
+
+// State adds state to fsm
+func (f *fsm) State(state string, fn StateFunc) {
+	f.mu.Lock()
+	f.statesMap[state] = fn
+	f.statesOrder = append(f.statesOrder, state)
+	f.mu.Unlock()
+}
+
+// Start runs state machine with provided data
+func (f *fsm) Start(ctx context.Context, args interface{}, opts ...Option) (interface{}, error) {
+	var err error
+
+	f.mu.Lock()
+	options := f.opts
+
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	sopts := []StateOption{StateDryRun(options.DryRun)}
+
+	cstate := options.Initial
+	states := make(map[string]StateFunc, len(f.statesMap))
+	for k, v := range f.statesMap {
+		states[k] = v
+	}
+	f.current = cstate
+	f.mu.Unlock()
+
+	var s State
+	s = &state{name: cstate, body: args}
+	nstate := s.Name()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		default:
+			fn, ok := states[nstate]
+			if !ok {
+				return nil, fmt.Errorf(`state "%s" %w`, nstate, ErrInvalidState)
+			}
+			f.mu.Lock()
+			f.current = nstate
+			f.mu.Unlock()
+
+			// wrap the handler func
+			for i := len(options.Wrappers); i > 0; i-- {
+				fn = options.Wrappers[i-1](fn)
+			}
+
+			s, err = fn(ctx, s, sopts...)
+
+			switch {
+			case err != nil:
+				return s.Body(), err
+			case s.Name() == StateEnd:
+				return s.Body(), nil
+			case s.Name() == "":
+				for idx := range f.statesOrder {
+					if f.statesOrder[idx] == nstate && len(f.statesOrder) > idx+1 {
+						nstate = f.statesOrder[idx+1]
+					}
+				}
+			default:
+				nstate = s.Name()
+			}
+		}
+	}
+}

fsm/fsm.go

@@ -0,0 +1,29 @@
+package fsm
+
+import (
+	"context"
+	"errors"
+)
+
+var (
+	ErrInvalidState = errors.New("does not exists")
+	StateEnd        = "end"
+)
+
+type State interface {
+	Name() string
+	Body() interface{}
+}
+
+// StateWrapper wraps the StateFunc and returns the equivalent
+type StateWrapper func(StateFunc) StateFunc
+
+// StateFunc called on state transition and return next step and error
+type StateFunc func(ctx context.Context, state State, opts ...StateOption) (State, error)
+
+type FSM interface {
+	Start(context.Context, interface{}, ...Option) (interface{}, error)
+	Current() string
+	Reset()
+	State(string, StateFunc)
+}

fsm/fsm_test.go

@@ -0,0 +1,72 @@
+package fsm
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"go.unistack.org/micro/v3/logger"
+)
+
+func TestFSMStart(t *testing.T) {
+	ctx := context.TODO()
+
+	if err := logger.DefaultLogger.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	wrapper := func(next StateFunc) StateFunc {
+		return func(sctx context.Context, s State, opts ...StateOption) (State, error) {
+			sctx = logger.NewContext(sctx, logger.DefaultLogger.Fields("state", s.Name()))
+			return next(sctx, s, opts...)
+		}
+	}
+
+	f := NewFSM(InitialState("1"), WrapState(wrapper))
+	f1 := func(sctx context.Context, s State, opts ...StateOption) (State, error) {
+		_, ok := logger.FromContext(sctx)
+		if !ok {
+			t.Fatal("f1 context does not have logger")
+		}
+		args := s.Body().(map[string]interface{})
+		if v, ok := args["request"].(string); !ok || v == "" {
+			return nil, fmt.Errorf("empty request")
+		}
+		return &state{name: "", body: map[string]interface{}{"response": "state1"}}, nil
+	}
+	f2 := func(sctx context.Context, s State, opts ...StateOption) (State, error) {
+		_, ok := logger.FromContext(sctx)
+		if !ok {
+			t.Fatal("f2 context does not have logger")
+		}
+		args := s.Body().(map[string]interface{})
+		if v, ok := args["response"].(string); !ok || v == "" {
+			return nil, fmt.Errorf("empty response")
+		}
+		return &state{name: "", body: map[string]interface{}{"response": "state2"}}, nil
+	}
+	f3 := func(sctx context.Context, s State, opts ...StateOption) (State, error) {
+		_, ok := logger.FromContext(sctx)
+		if !ok {
+			t.Fatal("f3 context does not have logger")
+		}
+		args := s.Body().(map[string]interface{})
+		if v, ok := args["response"].(string); !ok || v == "" {
+			return nil, fmt.Errorf("empty response")
+		}
+		return &state{name: StateEnd, body: map[string]interface{}{"response": "state3"}}, nil
+	}
+	f.State("1", f1)
+	f.State("2", f2)
+	f.State("3", f3)
+	rsp, err := f.Start(ctx, map[string]interface{}{"request": "state"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	args := rsp.(map[string]interface{})
+	if v, ok := args["response"].(string); !ok || v == "" {
+		t.Fatalf("nil rsp: %#+v", args)
+	} else if v != "state3" {
+		t.Fatalf("invalid rsp %#+v", args)
+	}
+}

fsm/options.go

@@ -0,0 +1,52 @@
+package fsm
+
+// Options struct holding fsm options
+type Options struct {
+	// Initial state
+	Initial string
+	// Wrappers runs before state
+	Wrappers []StateWrapper
+	// DryRun mode
+	DryRun bool
+}
+
+// Option func signature
+type Option func(*Options)
+
+// StateOptions holds state options
+type StateOptions struct {
+	DryRun bool
+}
+
+// StateDryRun says that state executes in dry run mode
+func StateDryRun(b bool) StateOption {
+	return func(o *StateOptions) {
+		o.DryRun = b
+	}
+}
+
+// StateOption func signature
+type StateOption func(*StateOptions)
+
+// InitialState sets init state for state machine
+func InitialState(initial string) Option {
+	return func(o *Options) {
+		o.Initial = initial
+	}
+}
+
+// WrapState adds a state Wrapper to a list of options passed into the fsm
+func WrapState(w StateWrapper) Option {
+	return func(o *Options) {
+		o.Wrappers = append(o.Wrappers, w)
+	}
+}
+
+// NewOptions returns new Options struct filled by passed Option
+func NewOptions(opts ...Option) Options {
+	options := Options{}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}

function.go

@@ -1,100 +0,0 @@
-// +build ignore
-
-package micro
-
-import (
-	"context"
-	"time"
-
-	"go.unistack.org/micro/v3/server"
-)
-
-// Function is a one time executing Service
-type Function interface {
-	// Inherits Service interface
-	Service
-	// Done signals to complete execution
-	Done() error
-	// Handle registers an RPC handler
-	Handle(v interface{}) error
-	// Subscribe registers a subscriber
-	Subscribe(topic string, v interface{}) error
-}
-
-type function struct {
-	cancel context.CancelFunc
-	Service
-}
-
-// NewFunction returns a new Function for a one time executing Service
-func NewFunction(opts ...Option) Function {
-	return newFunction(opts...)
-}
-
-func fnHandlerWrapper(f Function) server.HandlerWrapper {
-	return func(h server.HandlerFunc) server.HandlerFunc {
-		return func(ctx context.Context, req server.Request, rsp interface{}) error {
-			defer f.Done()
-			return h(ctx, req, rsp)
-		}
-	}
-}
-
-func fnSubWrapper(f Function) server.SubscriberWrapper {
-	return func(s server.SubscriberFunc) server.SubscriberFunc {
-		return func(ctx context.Context, msg server.Message) error {
-			defer f.Done()
-			return s(ctx, msg)
-		}
-	}
-}
-
-func newFunction(opts ...Option) Function {
-	ctx, cancel := context.WithCancel(context.Background())
-
-	// force ttl/interval
-	fopts := []Option{
-		RegisterTTL(time.Minute),
-		RegisterInterval(time.Second * 30),
-	}
-
-	// prepend to opts
-	fopts = append(fopts, opts...)
-
-	// make context the last thing
-	fopts = append(fopts, Context(ctx))
-
-	service := &service{opts: NewOptions(fopts...)}
-
-	fn := &function{
-		cancel:  cancel,
-		Service: service,
-	}
-
-	service.Server().Init(
-		// ensure the service waits for requests to finish
-		server.Wait(nil),
-		// wrap handlers and subscribers to finish execution
-		server.WrapHandler(fnHandlerWrapper(fn)),
-		server.WrapSubscriber(fnSubWrapper(fn)),
-	)
-
-	return fn
-}
-
-func (f *function) Done() error {
-	f.cancel()
-	return nil
-}
-
-func (f *function) Handle(v interface{}) error {
-	return f.Service.Server().Handle(
-		f.Service.Server().NewHandler(v),
-	)
-}
-
-func (f *function) Subscribe(topic string, v interface{}) error {
-	return f.Service.Server().Subscribe(
-		f.Service.Server().NewSubscriber(topic, v),
-	)
-}

function_test.go

@@ -1,66 +0,0 @@
-// +build ignore
-
-package micro
-
-/*
-import (
-	"context"
-	"sync"
-	"testing"
-
-	"go.unistack.org/micro/v3/register"
-)
-
-func TestFunction(t *testing.T) {
-	var wg sync.WaitGroup
-	wg.Add(1)
-
-	r := register.NewRegister()
-	ctx := context.TODO()
-	// create service
-	fn := NewFunction(
-		Register(r),
-		Name("test.function"),
-		AfterStart(func(ctx context.Context) error {
-			wg.Done()
-			return nil
-		}),
-	)
-
-	// we can't test fn.Init as it parses the command line
-	// fn.Init()
-
-	ch := make(chan error, 2)
-
-	go func() {
-		// run service
-		ch <- fn.Run()
-	}()
-
-	// wait for start
-	wg.Wait()
-
-	// test call debug
-	req := fn.Client().NewRequest(
-		"test.function",
-		"Debug.Health",
-		new(proto.HealthRequest),
-	)
-
-	rsp := new(proto.HealthResponse)
-
-	err := fn.Client().Call(context.TODO(), req, rsp)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if rsp.Status != "ok" {
-		t.Fatalf("function response: %s", rsp.Status)
-	}
-
-	if err := <-ch; err != nil {
-		t.Fatal(err)
-	}
-}
-
-*/

go.mod

@@ -1,14 +1,32 @@
 module go.unistack.org/micro/v3
 
-go 1.16
+go 1.22
 
 require (
-	github.com/ef-ds/deque v1.0.4
+	dario.cat/mergo v1.0.0
-	github.com/golang-jwt/jwt/v4 v4.1.0
+	github.com/DATA-DOG/go-sqlmock v1.5.0
-	github.com/imdario/mergo v0.3.12
+	github.com/KimMachineGun/automemlimit v0.6.1
+	github.com/google/uuid v1.3.0
 	github.com/patrickmn/go-cache v2.1.0+incompatible
-	github.com/silas/dag v0.0.0-20210626123444-3804bac2d6d4
+	github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5
-	go.unistack.org/micro-proto/v3 v3.1.0
+	go.uber.org/automaxprocs v1.6.0
-	golang.org/x/net v0.0.0-20210928044308-7d9f5e0b762b
+	go.unistack.org/micro-proto/v3 v3.4.1
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	golang.org/x/sync v0.3.0
+	google.golang.org/grpc v1.57.0
+	google.golang.org/protobuf v1.33.0
+)
+
+require (
+	github.com/cilium/ebpf v0.9.1 // indirect
+	github.com/containerd/cgroups/v3 v3.0.1 // indirect
+	github.com/coreos/go-systemd/v22 v22.3.2 // indirect
+	github.com/docker/go-units v0.4.0 // indirect
+	github.com/godbus/dbus/v5 v5.0.4 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/opencontainers/runtime-spec v1.0.2 // indirect
+	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
+	github.com/sirupsen/logrus v1.8.1 // indirect
+	golang.org/x/net v0.14.0 // indirect
+	golang.org/x/sys v0.11.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230526203410-71b5a4ffd15e // indirect
 )

go.sum

@@ -1,31 +1,78 @@
-github.com/ef-ds/deque v1.0.4 h1:iFAZNmveMT9WERAkqLJ+oaABF9AcVQ5AjXem/hroniI=
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+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
-github.com/golang-jwt/jwt/v4 v4.1.0 h1:XUgk2Ex5veyVFVeLm0xhusUTQybEbexJXrvPNOKkSY0=
+github.com/DATA-DOG/go-sqlmock v1.5.0 h1:Shsta01QNfFxHCfpW6YH2STWB0MudeXXEWMr20OEh60=
-github.com/golang-jwt/jwt/v4 v4.1.0/go.mod h1:/xlHOz8bRuivTWchD4jCa+NbatV+wEUSzwAxVc6locg=
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 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
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 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20230526203410-71b5a4ffd15e h1:NumxXLPfHSndr3wBBdeKiVHjGVFzi9RX2HwwQke94iY=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20230526203410-71b5a4ffd15e/go.mod h1:66JfowdXAEgad5O9NnYcsNPLCPZJD++2L9X0PCMODrA=
+google.golang.org/grpc v1.57.0 h1:kfzNeI/klCGD2YPMUlaGNT3pxvYfga7smW3Vth8Zsiw=
+google.golang.org/grpc v1.57.0/go.mod h1:Sd+9RMTACXwmub0zcNY2c4arhtrbBYD1AUHI/dt16Mo=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

logger/context.go

@@ -4,6 +4,17 @@ import "context"
 
 type loggerKey struct{}
 
+// MustContext returns logger from passed context or DefaultLogger if empty
+func MustContext(ctx context.Context) Logger {
+	if ctx == nil {
+		return DefaultLogger
+	}
+	if l, ok := ctx.Value(loggerKey{}).(Logger); ok && l != nil {
+		return l
+	}
+	return DefaultLogger
+}
+
 // FromContext returns logger from passed context
 func FromContext(ctx context.Context) (Logger, bool) {
 	if ctx == nil {

logger/context_test.go

@@ -0,0 +1,53 @@
+package logger
+
+import (
+	"context"
+	"testing"
+)
+
+func TestFromNilContext(t *testing.T) {
+	// nolint: staticcheck
+	c, ok := FromContext(nil)
+	if ok || c != nil {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewNilContext(t *testing.T) {
+	// nolint: staticcheck
+	ctx := NewContext(nil, NewLogger())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), loggerKey{}, NewLogger())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewLogger())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestSetOption(t *testing.T) {
+	type key struct{}
+	o := SetOption(key{}, "test")
+	opts := &Options{}
+	o(opts)
+
+	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
+		t.Fatal("SetOption not works")
+	}
+}

logger/default.go

@@ -1,241 +0,0 @@
-package logger
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"os"
-	"runtime"
-	"strings"
-	"sync"
-	"time"
-)
-
-type defaultLogger struct {
-	enc      *json.Encoder
-	logFunc  LogFunc
-	logfFunc LogfFunc
-	opts     Options
-	sync.RWMutex
-}
-
-// Init(opts...) should only overwrite provided options
-func (l *defaultLogger) Init(opts ...Option) error {
-	l.Lock()
-	for _, o := range opts {
-		o(&l.opts)
-	}
-	l.enc = json.NewEncoder(l.opts.Out)
-	// wrap the Log func
-	for i := len(l.opts.Wrappers); i > 0; i-- {
-		l.logFunc = l.opts.Wrappers[i-1].Log(l.logFunc)
-		l.logfFunc = l.opts.Wrappers[i-1].Logf(l.logfFunc)
-	}
-	l.Unlock()
-	return nil
-}
-
-func (l *defaultLogger) String() string {
-	return "micro"
-}
-
-func (l *defaultLogger) Clone(opts ...Option) Logger {
-	newopts := NewOptions(opts...)
-	oldopts := l.opts
-	for _, o := range opts {
-		o(&newopts)
-		o(&oldopts)
-	}
-
-	oldopts.Wrappers = newopts.Wrappers
-	l.Lock()
-	cl := &defaultLogger{opts: oldopts, logFunc: l.logFunc, logfFunc: l.logfFunc}
-	l.Unlock()
-
-	// wrap the Log func
-	for i := len(newopts.Wrappers); i > 0; i-- {
-		cl.logFunc = newopts.Wrappers[i-1].Log(cl.logFunc)
-		cl.logfFunc = newopts.Wrappers[i-1].Logf(cl.logfFunc)
-	}
-
-	return cl
-}
-
-func (l *defaultLogger) V(level Level) bool {
-	l.RLock()
-	ok := l.opts.Level.Enabled(level)
-	l.RUnlock()
-	return ok
-}
-
-func (l *defaultLogger) Level(level Level) {
-	l.Lock()
-	l.opts.Level = level
-	l.Unlock()
-}
-
-func (l *defaultLogger) Fields(fields ...interface{}) Logger {
-	nl := &defaultLogger{opts: l.opts, enc: l.enc}
-	if len(fields) == 0 {
-		return nl
-	} else if len(fields)%2 != 0 {
-		fields = fields[:len(fields)-1]
-	}
-	nl.opts.Fields = append(nl.opts.Fields, fields...)
-	return nl
-}
-
-func copyFields(src []interface{}) []interface{} {
-	dst := make([]interface{}, len(src))
-	copy(dst, src)
-	return dst
-}
-
-// logCallerfilePath returns a package/file:line description of the caller,
-// preserving only the leaf directory name and file name.
-func logCallerfilePath(loggingFilePath string) string {
-	// To make sure we trim the path correctly on Windows too, we
-	// counter-intuitively need to use '/' and *not* os.PathSeparator here,
-	// because the path given originates from Go stdlib, specifically
-	// runtime.Caller() which (as of Mar/17) returns forward slashes even on
-	// Windows.
-	//
-	// See https://github.com/golang/go/issues/3335
-	// and https://github.com/golang/go/issues/18151
-	//
-	// for discussion on the issue on Go side.
-	idx := strings.LastIndexByte(loggingFilePath, '/')
-	if idx == -1 {
-		return loggingFilePath
-	}
-	idx = strings.LastIndexByte(loggingFilePath[:idx], '/')
-	if idx == -1 {
-		return loggingFilePath
-	}
-	return loggingFilePath[idx+1:]
-}
-
-func (l *defaultLogger) Info(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, InfoLevel, args...)
-}
-
-func (l *defaultLogger) Error(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, ErrorLevel, args...)
-}
-
-func (l *defaultLogger) Debug(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, DebugLevel, args...)
-}
-
-func (l *defaultLogger) Warn(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, WarnLevel, args...)
-}
-
-func (l *defaultLogger) Trace(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, TraceLevel, args...)
-}
-
-func (l *defaultLogger) Fatal(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, FatalLevel, args...)
-	os.Exit(1)
-}
-
-func (l *defaultLogger) Infof(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, InfoLevel, msg, args...)
-}
-
-func (l *defaultLogger) Errorf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, ErrorLevel, msg, args...)
-}
-
-func (l *defaultLogger) Debugf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, DebugLevel, msg, args...)
-}
-
-func (l *defaultLogger) Warnf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, WarnLevel, msg, args...)
-}
-
-func (l *defaultLogger) Tracef(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, TraceLevel, msg, args...)
-}
-
-func (l *defaultLogger) Fatalf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, FatalLevel, msg, args...)
-	os.Exit(1)
-}
-
-func (l *defaultLogger) Log(ctx context.Context, level Level, args ...interface{}) {
-	if !l.V(level) {
-		return
-	}
-
-	l.RLock()
-	fields := copyFields(l.opts.Fields)
-	l.RUnlock()
-
-	fields = append(fields, "level", level.String())
-
-	if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
-		fields = append(fields, "caller", fmt.Sprintf("%s:%d", logCallerfilePath(file), line))
-	}
-	fields = append(fields, "timestamp", time.Now().Format("2006-01-02 15:04:05"))
-
-	if len(args) > 0 {
-		fields = append(fields, "msg", fmt.Sprint(args...))
-	}
-
-	out := make(map[string]interface{}, len(fields)/2)
-	for i := 0; i < len(fields); i += 2 {
-		out[fields[i].(string)] = fields[i+1]
-	}
-	l.RLock()
-	_ = l.enc.Encode(out)
-	l.RUnlock()
-}
-
-func (l *defaultLogger) Logf(ctx context.Context, level Level, msg string, args ...interface{}) {
-	if !l.V(level) {
-		return
-	}
-
-	l.RLock()
-	fields := copyFields(l.opts.Fields)
-	l.RUnlock()
-
-	fields = append(fields, "level", level.String())
-
-	if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
-		fields = append(fields, "caller", fmt.Sprintf("%s:%d", logCallerfilePath(file), line))
-	}
-
-	fields = append(fields, "timestamp", time.Now().Format("2006-01-02 15:04:05"))
-	if len(args) > 0 {
-		fields = append(fields, "msg", fmt.Sprintf(msg, args...))
-	} else if msg != "" {
-		fields = append(fields, "msg", msg)
-	}
-
-	out := make(map[string]interface{}, len(fields)/2)
-	for i := 0; i < len(fields); i += 2 {
-		out[fields[i].(string)] = fields[i+1]
-	}
-	l.RLock()
-	_ = l.enc.Encode(out)
-	l.RUnlock()
-}
-
-func (l *defaultLogger) Options() Options {
-	return l.opts
-}
-
-// NewLogger builds a new logger based on options
-func NewLogger(opts ...Option) Logger {
-	l := &defaultLogger{
-		opts: NewOptions(opts...),
-	}
-	l.logFunc = l.Log
-	l.logfFunc = l.Logf
-	l.enc = json.NewEncoder(l.opts.Out)
-	return l
-}

logger/logger.go

@@ -1,18 +1,19 @@
 // Package logger provides a log interface
-package logger // import "go.unistack.org/micro/v3/logger"
+package logger
 
 import (
 	"context"
-	"os"
 )
 
+type ContextAttrFunc func(ctx context.Context) []interface{}
+
+var DefaultContextAttrFuncs []ContextAttrFunc
+
 var (
 	// DefaultLogger variable
-	DefaultLogger Logger = NewLogger(WithLevel(ParseLevel(os.Getenv("MICRO_LOG_LEVEL"))))
+	DefaultLogger Logger = NewLogger()
 	// DefaultLevel used by logger
-	DefaultLevel Level = InfoLevel
+	DefaultLevel = InfoLevel
-	// DefaultCallerSkipCount used by logger
-	DefaultCallerSkipCount = 2
 )
 
 // Logger is a generic logging interface
@@ -30,111 +31,24 @@ type Logger interface {
 	// Fields set fields to always be logged with keyval pairs
 	Fields(fields ...interface{}) Logger
 	// Info level message
-	Info(ctx context.Context, args ...interface{})
+	Info(ctx context.Context, msg string, args ...interface{})
 	// Trace level message
-	Trace(ctx context.Context, args ...interface{})
+	Trace(ctx context.Context, msg string, args ...interface{})
 	// Debug level message
-	Debug(ctx context.Context, args ...interface{})
+	Debug(ctx context.Context, msg string, args ...interface{})
 	// Warn level message
-	Warn(ctx context.Context, args ...interface{})
+	Warn(ctx context.Context, msg string, args ...interface{})
 	// Error level message
-	Error(ctx context.Context, args ...interface{})
+	Error(ctx context.Context, msg string, args ...interface{})
 	// Fatal level message
-	Fatal(ctx context.Context, args ...interface{})
+	Fatal(ctx context.Context, msg string, args ...interface{})
-	// Infof level message
-	Infof(ctx context.Context, msg string, args ...interface{})
-	// Tracef level message
-	Tracef(ctx context.Context, msg string, args ...interface{})
-	// Debug level message
-	Debugf(ctx context.Context, msg string, args ...interface{})
-	// Warn level message
-	Warnf(ctx context.Context, msg string, args ...interface{})
-	// Error level message
-	Errorf(ctx context.Context, msg string, args ...interface{})
-	// Fatal level message
-	Fatalf(ctx context.Context, msg string, args ...interface{})
 	// Log logs message with needed level
-	Log(ctx context.Context, level Level, args ...interface{})
+	Log(ctx context.Context, level Level, msg string, args ...interface{})
-	// Logf logs message with needed level
+	// Name returns broker instance name
-	Logf(ctx context.Context, level Level, msg string, args ...interface{})
+	Name() string
-	// String returns the name of logger
+	// String returns the type of logger
 	String() string
 }
 
 // Field contains keyval pair
 type Field interface{}
-
-// Info writes msg to default logger on info level
-func Info(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Info(ctx, args...)
-}
-
-// Error writes msg to default logger on error level
-func Error(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Error(ctx, args...)
-}
-
-// Debug writes msg to default logger on debug level
-func Debug(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Debug(ctx, args...)
-}
-
-// Warn writes msg to default logger on warn level
-func Warn(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Warn(ctx, args...)
-}
-
-// Trace writes msg to default logger on trace level
-func Trace(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Trace(ctx, args...)
-}
-
-// Fatal writes msg to default logger on fatal level
-func Fatal(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Fatal(ctx, args...)
-}
-
-// Infof writes formatted msg to default logger on info level
-func Infof(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Infof(ctx, msg, args...)
-}
-
-// Errorf writes formatted msg to default logger on error level
-func Errorf(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Errorf(ctx, msg, args...)
-}
-
-// Debugf writes formatted msg to default logger on debug level
-func Debugf(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Debugf(ctx, msg, args...)
-}
-
-// Warnf writes formatted msg to default logger on warn level
-func Warnf(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Warnf(ctx, msg, args...)
-}
-
-// Tracef writes formatted msg to default logger on trace level
-func Tracef(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Tracef(ctx, msg, args...)
-}
-
-// Fatalf writes formatted msg to default logger on fatal level
-func Fatalf(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Fatalf(ctx, msg, args...)
-}
-
-// V returns true if passed level enabled in default logger
-func V(level Level) bool {
-	return DefaultLogger.V(level)
-}
-
-// Init initialize logger
-func Init(opts ...Option) error {
-	return DefaultLogger.Init(opts...)
-}
-
-// Fields create logger with specific fields
-func Fields(fields ...interface{}) Logger {
-	return DefaultLogger.Fields(fields...)
-}

logger/logger_test.go

@@ -1,117 +0,0 @@
-package logger
-
-import (
-	"bytes"
-	"context"
-	"log"
-	"testing"
-)
-
-func TestClone(t *testing.T) {
-	ctx := context.TODO()
-	buf := bytes.NewBuffer(nil)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	nl := l.Clone(WithLevel(ErrorLevel))
-	if err := nl.Init(); err != nil {
-		t.Fatal(err)
-	}
-	nl.Info(ctx, "info message")
-	if len(buf.Bytes()) != 0 {
-		t.Fatal("message must not be logged")
-	}
-	l.Info(ctx, "info message")
-	if len(buf.Bytes()) == 0 {
-		t.Fatal("message must be logged")
-	}
-}
-
-func TestRedirectStdLogger(t *testing.T) {
-	buf := bytes.NewBuffer(nil)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	fn := RedirectStdLogger(l, ErrorLevel)
-	defer fn()
-	log.Print("test")
-	if !bytes.Contains(buf.Bytes(), []byte(`"level":"error","msg":"test","timestamp"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-}
-
-func TestStdLogger(t *testing.T) {
-	buf := bytes.NewBuffer(nil)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	lg := NewStdLogger(l, ErrorLevel)
-	lg.Print("test")
-	if !bytes.Contains(buf.Bytes(), []byte(`"level":"error","msg":"test","timestamp"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-}
-
-func TestLogger(t *testing.T) {
-	ctx := context.TODO()
-	buf := bytes.NewBuffer(nil)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	l.Trace(ctx, "trace_msg1")
-	l.Warn(ctx, "warn_msg1")
-	l.Fields("error", "test").Info(ctx, "error message")
-	l.Warn(ctx, "first", " ", "second")
-	if !bytes.Contains(buf.Bytes(), []byte(`"level":"trace","msg":"trace_msg1"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-	if !bytes.Contains(buf.Bytes(), []byte(`"warn","msg":"warn_msg1"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-	if !bytes.Contains(buf.Bytes(), []byte(`"error":"test","level":"info","msg":"error message"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-	if !bytes.Contains(buf.Bytes(), []byte(`"level":"warn","msg":"first second"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-}
-
-func TestLoggerWrapper(t *testing.T) {
-	ctx := context.TODO()
-	buf := bytes.NewBuffer(nil)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(WrapLogger(NewOmitWrapper())); err != nil {
-		t.Fatal(err)
-	}
-	type secret struct {
-		Name  string
-		Passw string `logger:"omit"`
-	}
-	s := &secret{Name: "name", Passw: "secret"}
-	l.Errorf(ctx, "test %#+v", s)
-	if !bytes.Contains(buf.Bytes(), []byte(`logger.secret{Name:\"name\", Passw:\"\"}"`)) {
-		t.Fatalf("omit not works, struct: %v, output: %s", s, buf.Bytes())
-	}
-}
-
-func TestOmitLoggerWrapper(t *testing.T) {
-	ctx := context.TODO()
-	buf := bytes.NewBuffer(nil)
-	l := NewOmitLogger(NewLogger(WithLevel(TraceLevel), WithOutput(buf)))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	type secret struct {
-		Name  string
-		Passw string `logger:"omit"`
-	}
-	s := &secret{Name: "name", Passw: "secret"}
-	l.Errorf(ctx, "test %#+v", s)
-	if !bytes.Contains(buf.Bytes(), []byte(`logger.secret{Name:\"name\", Passw:\"\"}"`)) {
-		t.Fatalf("omit not works, struct: %v, output: %s", s, buf.Bytes())
-	}
-}

logger/noop.go

@@ -0,0 +1,78 @@
+package logger
+
+import (
+	"context"
+)
+
+const (
+	defaultCallerSkipCount = 2
+)
+
+type noopLogger struct {
+	opts Options
+}
+
+func NewLogger(opts ...Option) Logger {
+	options := NewOptions(opts...)
+	options.CallerSkipCount = defaultCallerSkipCount
+	return &noopLogger{opts: options}
+}
+
+func (l *noopLogger) V(_ Level) bool {
+	return false
+}
+
+func (l *noopLogger) Level(_ Level) {
+}
+
+func (l *noopLogger) Name() string {
+	return l.opts.Name
+}
+
+func (l *noopLogger) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&l.opts)
+	}
+	return nil
+}
+
+func (l *noopLogger) Clone(opts ...Option) Logger {
+	nl := &noopLogger{opts: l.opts}
+	for _, o := range opts {
+		o(&nl.opts)
+	}
+	return nl
+}
+
+func (l *noopLogger) Fields(_ ...interface{}) Logger {
+	return l
+}
+
+func (l *noopLogger) Options() Options {
+	return l.opts
+}
+
+func (l *noopLogger) String() string {
+	return "noop"
+}
+
+func (l *noopLogger) Log(ctx context.Context, lvl Level, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Info(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Debug(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Error(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Trace(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Warn(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Fatal(ctx context.Context, msg string, attrs ...interface{}) {
+}

logger/options.go

@@ -3,10 +3,14 @@ package logger
 import (
 	"context"
 	"io"
+	"log/slog"
 	"os"
+	"time"
+
+	"go.unistack.org/micro/v3/meter"
 )
 
-// Option func
+// Option func signature
 type Option func(*Options)
 
 // Options holds logger options
@@ -15,16 +19,36 @@ type Options struct {
 	Out io.Writer
 	// Context holds exernal options
 	Context context.Context
-	// Fields holds additional metadata
-	Fields []interface{}
 	// Name holds the logger name
 	Name string
-	// Wrappers logger wrapper that called before actual Log/Logf function
+	// Fields holds additional metadata
-	Wrappers []Wrapper
+	Fields []interface{}
+	// callerSkipCount number of frmaes to skip
+	CallerSkipCount int
+	// ContextAttrFuncs contains funcs that executed before log func on context
+	ContextAttrFuncs []ContextAttrFunc
+	// TimeKey is the key used for the time of the log call
+	TimeKey string
+	// LevelKey is the key used for the level of the log call
+	LevelKey string
+	// ErroreKey is the key used for the error of the log call
+	ErrorKey string
+	// MessageKey is the key used for the message of the log call
+	MessageKey string
+	// SourceKey is the key used for the source file and line of the log call
+	SourceKey string
+	// StacktraceKey is the key used for the stacktrace
+	StacktraceKey string
+	// AddStacktrace controls writing of stacktaces on error
+	AddStacktrace bool
+	// AddSource enabled writing source file and position in log
+	AddSource bool
 	// The logging level the logger should log
 	Level Level
-	// CallerSkipCount number of frmaes to skip
+	// TimeFunc used to obtain current time
-	CallerSkipCount int
+	TimeFunc func() time.Time
+	// Meter used to count logs for specific level
+	Meter meter.Meter
 }
 
 // NewOptions creates new options struct
@@ -33,15 +57,29 @@ func NewOptions(opts ...Option) Options {
 		Level:            DefaultLevel,
 		Fields:           make([]interface{}, 0, 6),
 		Out:              os.Stderr,
-		CallerSkipCount: DefaultCallerSkipCount,
 		Context:          context.Background(),
+		ContextAttrFuncs: DefaultContextAttrFuncs,
+		AddSource:        true,
+		TimeFunc:         time.Now,
+		Meter:            meter.DefaultMeter,
 	}
+
+	WithMicroKeys()(&options)
+
 	for _, o := range opts {
 		o(&options)
 	}
+
 	return options
 }
 
+// WithContextAttrFuncs appends default funcs for the context attrs filler
+func WithContextAttrFuncs(fncs ...ContextAttrFunc) Option {
+	return func(o *Options) {
+		o.ContextAttrFuncs = append(o.ContextAttrFuncs, fncs...)
+	}
+}
+
 // WithFields set default fields for the logger
 func WithFields(fields ...interface{}) Option {
 	return func(o *Options) {
@@ -63,10 +101,17 @@ func WithOutput(out io.Writer) Option {
 	}
 }
 
-// WithCallerSkipCount set frame count to skip
+// WithAddStacktrace controls writing stacktrace on error
-func WithCallerSkipCount(c int) Option {
+func WithAddStacktrace(v bool) Option {
 	return func(o *Options) {
-		o.CallerSkipCount = c
+		o.AddStacktrace = v
+	}
+}
+
+// WithAddSource controls writing source file and pos in log
+func WithAddSource(v bool) Option {
+	return func(o *Options) {
+		o.AddSource = v
 	}
 }
 
@@ -84,9 +129,69 @@ func WithName(n string) Option {
 	}
 }
 
-// WrapLogger adds a logger Wrapper to a list of options passed into the logger
+// WithMeter sets the meter
-func WrapLogger(w Wrapper) Option {
+func WithMeter(m meter.Meter) Option {
 	return func(o *Options) {
-		o.Wrappers = append(o.Wrappers, w)
+		o.Meter = m
+	}
+}
+
+// WithTimeFunc sets the func to obtain current time
+func WithTimeFunc(fn func() time.Time) Option {
+	return func(o *Options) {
+		o.TimeFunc = fn
+	}
+}
+
+func WithZapKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = "@timestamp"
+		o.LevelKey = "level"
+		o.MessageKey = "msg"
+		o.SourceKey = "caller"
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+func WithZerologKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = "time"
+		o.LevelKey = "level"
+		o.MessageKey = "message"
+		o.SourceKey = "caller"
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+func WithSlogKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = slog.TimeKey
+		o.LevelKey = slog.LevelKey
+		o.MessageKey = slog.MessageKey
+		o.SourceKey = slog.SourceKey
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+func WithMicroKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = "timestamp"
+		o.LevelKey = "level"
+		o.MessageKey = "msg"
+		o.SourceKey = "caller"
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+// WithAddCallerSkipCount add skip count for copy logger
+func WithAddCallerSkipCount(n int) Option {
+	return func(o *Options) {
+		if n > 0 {
+			o.CallerSkipCount += n
+		}
 	}
 }

logger/slog/slog.go

@@ -0,0 +1,332 @@
+package slog
+
+import (
+	"context"
+	"log/slog"
+	"os"
+	"regexp"
+	"runtime"
+	"strconv"
+	"sync"
+	"sync/atomic"
+
+	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v3/semconv"
+	"go.unistack.org/micro/v3/tracer"
+)
+
+const (
+	badKey = "!BADKEY"
+	// defaultCallerSkipCount used by logger
+	defaultCallerSkipCount = 3
+)
+
+var reTrace = regexp.MustCompile(`.*/slog/logger\.go.*\n`)
+
+var (
+	traceValue = slog.StringValue("trace")
+	debugValue = slog.StringValue("debug")
+	infoValue  = slog.StringValue("info")
+	warnValue  = slog.StringValue("warn")
+	errorValue = slog.StringValue("error")
+	fatalValue = slog.StringValue("fatal")
+)
+
+type wrapper struct {
+	h     slog.Handler
+	level atomic.Int64
+}
+
+func (h *wrapper) Enabled(ctx context.Context, level slog.Level) bool {
+	return level >= slog.Level(int(h.level.Load()))
+}
+
+func (h *wrapper) Handle(ctx context.Context, rec slog.Record) error {
+	return h.h.Handle(ctx, rec)
+}
+
+func (h *wrapper) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return h.WithAttrs(attrs)
+}
+
+func (h *wrapper) WithGroup(name string) slog.Handler {
+	return h.WithGroup(name)
+}
+
+func (s *slogLogger) renameAttr(_ []string, a slog.Attr) slog.Attr {
+	switch a.Key {
+	case slog.SourceKey:
+		source := a.Value.Any().(*slog.Source)
+		a.Value = slog.StringValue(source.File + ":" + strconv.Itoa(source.Line))
+		a.Key = s.opts.SourceKey
+	case slog.TimeKey:
+		a.Key = s.opts.TimeKey
+	case slog.MessageKey:
+		a.Key = s.opts.MessageKey
+	case slog.LevelKey:
+		level := a.Value.Any().(slog.Level)
+		lvl := slogToLoggerLevel(level)
+		a.Key = s.opts.LevelKey
+		switch {
+		case lvl < logger.DebugLevel:
+			a.Value = traceValue
+		case lvl < logger.InfoLevel:
+			a.Value = debugValue
+		case lvl < logger.WarnLevel:
+			a.Value = infoValue
+		case lvl < logger.ErrorLevel:
+			a.Value = warnValue
+		case lvl < logger.FatalLevel:
+			a.Value = errorValue
+		case lvl >= logger.FatalLevel:
+			a.Value = fatalValue
+		default:
+			a.Value = infoValue
+		}
+	}
+
+	return a
+}
+
+type slogLogger struct {
+	leveler *slog.LevelVar
+	handler *wrapper
+	opts    logger.Options
+	mu      sync.RWMutex
+}
+
+func (s *slogLogger) Clone(opts ...logger.Option) logger.Logger {
+	s.mu.RLock()
+	options := s.opts
+	s.mu.RUnlock()
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if len(options.ContextAttrFuncs) == 0 {
+		options.ContextAttrFuncs = logger.DefaultContextAttrFuncs
+	}
+
+	attrs, _ := s.argsAttrs(options.Fields)
+	l := &slogLogger{
+		handler: &wrapper{h: s.handler.h.WithAttrs(attrs)},
+		opts:    options,
+	}
+	l.handler.level.Store(int64(loggerToSlogLevel(options.Level)))
+
+	return l
+}
+
+func (s *slogLogger) V(level logger.Level) bool {
+	s.mu.Lock()
+	v := s.opts.Level.Enabled(level)
+	s.mu.Unlock()
+	return v
+}
+
+func (s *slogLogger) Level(level logger.Level) {
+	s.mu.Lock()
+	s.opts.Level = level
+	s.handler.level.Store(int64(loggerToSlogLevel(level)))
+	s.mu.Unlock()
+}
+
+func (s *slogLogger) Options() logger.Options {
+	return s.opts
+}
+
+func (s *slogLogger) Fields(fields ...interface{}) logger.Logger {
+	s.mu.RLock()
+	options := s.opts
+	s.mu.RUnlock()
+
+	l := &slogLogger{opts: options}
+
+	if len(options.ContextAttrFuncs) == 0 {
+		options.ContextAttrFuncs = logger.DefaultContextAttrFuncs
+	}
+
+	attrs, _ := s.argsAttrs(fields)
+	l.handler = &wrapper{h: s.handler.h.WithAttrs(attrs)}
+	l.handler.level.Store(int64(loggerToSlogLevel(l.opts.Level)))
+
+	return l
+}
+
+func (s *slogLogger) Init(opts ...logger.Option) error {
+	s.mu.Lock()
+
+	for _, o := range opts {
+		o(&s.opts)
+	}
+
+	if len(s.opts.ContextAttrFuncs) == 0 {
+		s.opts.ContextAttrFuncs = logger.DefaultContextAttrFuncs
+	}
+
+	handleOpt := &slog.HandlerOptions{
+		ReplaceAttr: s.renameAttr,
+		Level:       loggerToSlogLevel(logger.TraceLevel),
+		AddSource:   s.opts.AddSource,
+	}
+
+	attrs, _ := s.argsAttrs(s.opts.Fields)
+	s.handler = &wrapper{h: slog.NewJSONHandler(s.opts.Out, handleOpt).WithAttrs(attrs)}
+	s.handler.level.Store(int64(loggerToSlogLevel(s.opts.Level)))
+	s.mu.Unlock()
+
+	return nil
+}
+
+func (s *slogLogger) Log(ctx context.Context, lvl logger.Level, msg string, attrs ...interface{}) {
+	s.printLog(ctx, lvl, msg, attrs...)
+}
+
+func (s *slogLogger) Info(ctx context.Context, msg string, attrs ...interface{}) {
+	s.printLog(ctx, logger.InfoLevel, msg, attrs...)
+}
+
+func (s *slogLogger) Debug(ctx context.Context, msg string, attrs ...interface{}) {
+	s.printLog(ctx, logger.DebugLevel, msg, attrs...)
+}
+
+func (s *slogLogger) Trace(ctx context.Context, msg string, attrs ...interface{}) {
+	s.printLog(ctx, logger.TraceLevel, msg, attrs...)
+}
+
+func (s *slogLogger) Error(ctx context.Context, msg string, attrs ...interface{}) {
+	s.printLog(ctx, logger.ErrorLevel, msg, attrs...)
+}
+
+func (s *slogLogger) Fatal(ctx context.Context, msg string, attrs ...interface{}) {
+	s.printLog(ctx, logger.FatalLevel, msg, attrs...)
+	os.Exit(1)
+}
+
+func (s *slogLogger) Warn(ctx context.Context, msg string, attrs ...interface{}) {
+	s.printLog(ctx, logger.WarnLevel, msg, attrs...)
+}
+
+func (s *slogLogger) Name() string {
+	return s.opts.Name
+}
+
+func (s *slogLogger) String() string {
+	return "slog"
+}
+
+func (s *slogLogger) printLog(ctx context.Context, lvl logger.Level, msg string, args ...interface{}) {
+	if !s.V(lvl) {
+		return
+	}
+	var argError error
+
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", lvl.String()).Inc()
+
+	attrs, err := s.argsAttrs(args)
+	if err != nil {
+		argError = err
+	}
+	if argError != nil {
+		if span, ok := tracer.SpanFromContext(ctx); ok {
+			span.SetStatus(tracer.SpanStatusError, argError.Error())
+		}
+	}
+
+	for _, fn := range s.opts.ContextAttrFuncs {
+		ctxAttrs, err := s.argsAttrs(fn(ctx))
+		if err != nil {
+			argError = err
+		}
+		attrs = append(attrs, ctxAttrs...)
+	}
+	if argError != nil {
+		if span, ok := tracer.SpanFromContext(ctx); ok {
+			span.SetStatus(tracer.SpanStatusError, argError.Error())
+		}
+	}
+
+	if s.opts.AddStacktrace && lvl == logger.ErrorLevel {
+		stackInfo := make([]byte, 1024*1024)
+		if stackSize := runtime.Stack(stackInfo, false); stackSize > 0 {
+			traceLines := reTrace.Split(string(stackInfo[:stackSize]), -1)
+			if len(traceLines) != 0 {
+				attrs = append(attrs, slog.String(s.opts.StacktraceKey, traceLines[len(traceLines)-1]))
+			}
+		}
+	}
+
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, printLog, LogLvlMethod]
+	r := slog.NewRecord(s.opts.TimeFunc(), loggerToSlogLevel(lvl), msg, pcs[0])
+	r.AddAttrs(attrs...)
+	_ = s.handler.Handle(ctx, r)
+}
+
+func NewLogger(opts ...logger.Option) logger.Logger {
+	s := &slogLogger{
+		opts: logger.NewOptions(opts...),
+	}
+	s.opts.CallerSkipCount = defaultCallerSkipCount
+
+	return s
+}
+
+func loggerToSlogLevel(level logger.Level) slog.Level {
+	switch level {
+	case logger.DebugLevel:
+		return slog.LevelDebug
+	case logger.WarnLevel:
+		return slog.LevelWarn
+	case logger.ErrorLevel:
+		return slog.LevelError
+	case logger.TraceLevel:
+		return slog.LevelDebug - 1
+	case logger.FatalLevel:
+		return slog.LevelError + 1
+	default:
+		return slog.LevelInfo
+	}
+}
+
+func slogToLoggerLevel(level slog.Level) logger.Level {
+	switch level {
+	case slog.LevelDebug:
+		return logger.DebugLevel
+	case slog.LevelWarn:
+		return logger.WarnLevel
+	case slog.LevelError:
+		return logger.ErrorLevel
+	case slog.LevelDebug - 1:
+		return logger.TraceLevel
+	case slog.LevelError + 1:
+		return logger.FatalLevel
+	default:
+		return logger.InfoLevel
+	}
+}
+
+func (s *slogLogger) argsAttrs(args []interface{}) ([]slog.Attr, error) {
+	attrs := make([]slog.Attr, 0, len(args))
+	var err error
+
+	for idx := 0; idx < len(args); idx++ {
+		switch arg := args[idx].(type) {
+		case slog.Attr:
+			attrs = append(attrs, arg)
+		case string:
+			if idx+1 < len(args) {
+				attrs = append(attrs, slog.Any(arg, args[idx+1]))
+				idx += 1
+			} else {
+				attrs = append(attrs, slog.String(badKey, arg))
+			}
+		case error:
+			attrs = append(attrs, slog.String(s.opts.ErrorKey, arg.Error()))
+			err = arg
+		}
+	}
+
+	return attrs, err
+}

logger/slog/slog_test.go

@@ -0,0 +1,294 @@
+package slog
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"log"
+	"strings"
+	"testing"
+
+	"github.com/google/uuid"
+	"go.unistack.org/micro/v3/metadata"
+
+	"go.unistack.org/micro/v3/logger"
+)
+
+func TestMultipleFieldsWithLevel(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.InfoLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	l = l.Fields("key", "val")
+
+	l.Info(ctx, "msg1")
+	nl := l.Clone(logger.WithLevel(logger.DebugLevel))
+	nl.Debug(ctx, "msg2")
+	l.Debug(ctx, "msg3")
+	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"msg1"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"msg2"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+	if bytes.Contains(buf.Bytes(), []byte(`"msg3"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestMultipleFields(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.InfoLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	l = l.Fields("key", "val")
+
+	l = l.Fields("key1", "val1")
+
+	l.Info(ctx, "msg")
+
+	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"key1":"val1"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestError(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.ErrorLevel), logger.WithOutput(buf), logger.WithAddStacktrace(true))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	l.Error(ctx, "message", fmt.Errorf("error message"))
+	if !bytes.Contains(buf.Bytes(), []byte(`"stacktrace":"`)) {
+		t.Fatalf("logger stacktrace not works, buf contains: %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"error":"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestErrorf(t *testing.T) {
+	ctx := context.TODO()
+
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.ErrorLevel), logger.WithOutput(buf), logger.WithAddStacktrace(true))
+	if err := l.Init(logger.WithContextAttrFuncs(func(ctx context.Context) []interface{} {
+		return nil
+	})); err != nil {
+		t.Fatal(err)
+	}
+
+	l.Log(ctx, logger.ErrorLevel, "message", errors.New("error msg"))
+
+	l.Log(ctx, logger.ErrorLevel, "", errors.New("error msg"))
+	if !bytes.Contains(buf.Bytes(), []byte(`"error":"error msg"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+
+	if !bytes.Contains(buf.Bytes(), []byte(`"stacktrace":"`)) {
+		t.Fatalf("logger stacktrace not works, buf contains: %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"error":"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestContext(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	nl, ok := logger.FromContext(logger.NewContext(ctx, l.Fields("key", "val")))
+	if !ok {
+		t.Fatal("context without logger")
+	}
+	nl.Info(ctx, "message")
+	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
+		t.Fatalf("logger fields not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestFields(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	nl := l.Fields("key", "val")
+
+	nl.Info(ctx, "message")
+	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
+		t.Fatalf("logger fields not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestFromContextWithFields(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	var ok bool
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	nl := l.Fields("key", "val")
+
+	ctx = logger.NewContext(ctx, nl)
+
+	l, ok = logger.FromContext(ctx)
+	if !ok {
+		t.Fatalf("context does not have logger")
+	}
+
+	l.Info(ctx, "message")
+	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
+		t.Fatalf("logger fields not works, buf contains: %s", buf.Bytes())
+	}
+
+	l.Info(ctx, "test", "uncorrected number attributes")
+	if !bytes.Contains(buf.Bytes(), []byte(`"!BADKEY":"uncorrected number attributes"`)) {
+		t.Fatalf("logger fields not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestClone(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	nl := l.Clone(logger.WithLevel(logger.ErrorLevel))
+	if err := nl.Init(); err != nil {
+		t.Fatal(err)
+	}
+	nl.Info(ctx, "info message")
+	if len(buf.Bytes()) != 0 {
+		t.Fatal("message must not be logged")
+	}
+	l.Info(ctx, "info message")
+	if len(buf.Bytes()) == 0 {
+		t.Fatal("message must be logged")
+	}
+}
+
+func TestRedirectStdLogger(t *testing.T) {
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.ErrorLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	fn := logger.RedirectStdLogger(l, logger.ErrorLevel)
+	defer fn()
+	log.Print("test")
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"error"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"test"`))) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+}
+
+func TestStdLogger(t *testing.T) {
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	lg := logger.NewStdLogger(l, logger.ErrorLevel)
+	lg.Print("test")
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"error"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"test"`))) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+}
+
+func TestLogger(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	l.Trace(ctx, "trace_msg1")
+	l.Warn(ctx, "warn_msg1")
+	l.Fields("error", "test").Info(ctx, "error message")
+	l.Warn(ctx, "first second")
+
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"trace"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"trace_msg1"`))) {
+		t.Fatalf("logger tracer, buf %s", buf.Bytes())
+	}
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"warn"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"warn_msg1"`))) {
+		t.Fatalf("logger warn, buf %s", buf.Bytes())
+	}
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"info"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"error message","error":"test"`))) {
+		t.Fatalf("logger info, buf %s", buf.Bytes())
+	}
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"warn"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"first second"`))) {
+		t.Fatalf("logger warn, buf %s", buf.Bytes())
+	}
+}
+
+func Test_WithContextAttrFunc(t *testing.T) {
+	loggerContextAttrFuncs := []logger.ContextAttrFunc{
+		func(ctx context.Context) []interface{} {
+			md, ok := metadata.FromIncomingContext(ctx)
+			if !ok {
+				return nil
+			}
+			attrs := make([]interface{}, 0, 10)
+			for k, v := range md {
+				switch k {
+				case "X-Request-Id", "Phone", "External-Id", "Source-Service", "X-App-Install-Id", "Client-Id", "Client-Ip":
+					attrs = append(attrs, strings.ToLower(k), v)
+				}
+			}
+			return attrs
+		},
+	}
+
+	logger.DefaultContextAttrFuncs = append(logger.DefaultContextAttrFuncs, loggerContextAttrFuncs...)
+
+	ctx := context.TODO()
+	ctx = metadata.AppendIncomingContext(ctx, "X-Request-Id", uuid.New().String(),
+		"Source-Service", "Test-System")
+
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	l.Info(ctx, "test message")
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"info"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"test message"`))) {
+		t.Fatalf("logger info, buf %s", buf.Bytes())
+	}
+	if !(bytes.Contains(buf.Bytes(), []byte(`"x-request-id":"`))) {
+		t.Fatalf("logger info, buf %s", buf.Bytes())
+	}
+	if !(bytes.Contains(buf.Bytes(), []byte(`"source-service":"Test-System"`))) {
+		t.Fatalf("logger info, buf %s", buf.Bytes())
+	}
+	buf.Reset()
+	imd, _ := metadata.FromIncomingContext(ctx)
+	l.Info(ctx, "test message1")
+	imd.Set("Source-Service", "Test-System2")
+	l.Info(ctx, "test message2")
+
+	// t.Logf("xxx %s", buf.Bytes())
+}

logger/stdlogger.go

@@ -10,6 +10,7 @@ type stdLogger struct {
 	level Level
 }
 
+// NewStdLogger returns new *log.Logger baked by logger.Logger implementation
 func NewStdLogger(l Logger, level Level) *log.Logger {
 	return log.New(&stdLogger{l: l, level: level}, "" /* prefix */, 0 /* flags */)
 }
@@ -20,6 +21,7 @@ func (sl *stdLogger) Write(p []byte) (int, error) {
 	return len(p), nil
 }
 
+// RedirectStdLogger replace *log.Logger with logger.Logger implementation
 func RedirectStdLogger(l Logger, level Level) func() {
 	flags := log.Flags()
 	prefix := log.Prefix()

logger/unwrap/unwrap.go

@@ -0,0 +1,681 @@
+package unwrap
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"reflect"
+	"strconv"
+	"strings"
+
+	"go.unistack.org/micro/v3/codec"
+)
+
+const sf = "0-+# "
+
+var hexDigits = "0123456789abcdef"
+
+var (
+	panicBytes         = []byte("(PANIC=")
+	plusBytes          = []byte("+")
+	iBytes             = []byte("i")
+	trueBytes          = []byte("true")
+	falseBytes         = []byte("false")
+	interfaceBytes     = []byte("(interface {})")
+	openBraceBytes     = []byte("{")
+	closeBraceBytes    = []byte("}")
+	asteriskBytes      = []byte("*")
+	ampBytes           = []byte("&")
+	colonBytes         = []byte(":")
+	openParenBytes     = []byte("(")
+	closeParenBytes    = []byte(")")
+	spaceBytes         = []byte(" ")
+	commaBytes         = []byte(",")
+	pointerChainBytes  = []byte("->")
+	nilAngleBytes      = []byte("<nil>")
+	circularShortBytes = []byte("<shown>")
+	invalidAngleBytes  = []byte("<invalid>")
+	filteredBytes      = []byte("<filtered>")
+	openBracketBytes   = []byte("[")
+	closeBracketBytes  = []byte("]")
+	percentBytes       = []byte("%")
+	precisionBytes     = []byte(".")
+	openAngleBytes     = []byte("<")
+	closeAngleBytes    = []byte(">")
+	openMapBytes       = []byte("{")
+	closeMapBytes      = []byte("}")
+)
+
+type protoMessage interface {
+	Reset()
+	ProtoMessage()
+}
+
+type Wrapper struct {
+	val              interface{}
+	s                fmt.State
+	pointers         map[uintptr]int
+	opts             *Options
+	depth            int
+	ignoreNextType   bool
+	takeMap          map[int]bool
+	protoWrapperType bool
+	sqlWrapperType   bool
+}
+
+// Options struct
+type Options struct {
+	Codec   codec.Codec
+	Indent  string
+	Methods bool
+	Tagged  bool
+}
+
+// NewOptions creates new Options struct via provided args
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Indent:  " ",
+		Methods: false,
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+// Option func signature
+type Option func(*Options)
+
+// Indent option specify indent level
+func Indent(f string) Option {
+	return func(o *Options) {
+		o.Indent = f
+	}
+}
+
+// Methods option toggles fmt.Stringer methods
+func Methods(b bool) Option {
+	return func(o *Options) {
+		o.Methods = b
+	}
+}
+
+// Codec option automatic marshal arg via specified codec and write it to log
+func Codec(c codec.Codec) Option {
+	return func(o *Options) {
+		o.Codec = c
+	}
+}
+
+// Tagged option toggles output only logger:"take" fields
+func Tagged(b bool) Option {
+	return func(o *Options) {
+		o.Tagged = b
+	}
+}
+
+func Unwrap(val interface{}, opts ...Option) *Wrapper {
+	options := NewOptions(opts...)
+	return &Wrapper{val: val, opts: &options, pointers: make(map[uintptr]int), takeMap: make(map[int]bool)}
+}
+
+func (w *Wrapper) unpackValue(v reflect.Value) reflect.Value {
+	if v.Kind() == reflect.Interface {
+		w.ignoreNextType = false
+		if !v.IsNil() {
+			v = v.Elem()
+		}
+	}
+	return v
+}
+
+// formatPtr handles formatting of pointers by indirecting them as necessary.
+func (w *Wrapper) formatPtr(v reflect.Value) {
+	// Display nil if top level pointer is nil.
+	showTypes := w.s.Flag('#')
+	if v.IsNil() && (!showTypes || w.ignoreNextType) {
+		_, _ = w.s.Write(nilAngleBytes)
+		return
+	}
+
+	// Remove pointers at or below the current depth from map used to detect
+	// circular refs.
+	for k, depth := range w.pointers {
+		if depth >= w.depth {
+			delete(w.pointers, k)
+		}
+	}
+
+	// Keep list of all dereferenced pointers to possibly show later.
+	pointerChain := make([]uintptr, 0)
+
+	// Figure out how many levels of indirection there are by derferencing
+	// pointers and unpacking interfaces down the chain while detecting circular
+	// references.
+	nilFound := false
+	cycleFound := false
+	indirects := 0
+	ve := v
+	for ve.Kind() == reflect.Ptr {
+		if ve.IsNil() {
+			nilFound = true
+			break
+		}
+		indirects++
+		addr := ve.Pointer()
+		pointerChain = append(pointerChain, addr)
+		if pd, ok := w.pointers[addr]; ok && pd < w.depth {
+			cycleFound = true
+			indirects--
+			break
+		}
+		w.pointers[addr] = w.depth
+
+		ve = ve.Elem()
+		if ve.Kind() == reflect.Interface {
+			if ve.IsNil() {
+				nilFound = true
+				break
+			}
+			ve = ve.Elem()
+		}
+	}
+
+	// Display type or indirection level depending on flags.
+	if showTypes && !w.ignoreNextType {
+		if w.depth > 0 {
+			_, _ = w.s.Write(openParenBytes)
+		}
+		if w.depth > 0 {
+			_, _ = w.s.Write(bytes.Repeat(asteriskBytes, indirects))
+		} else {
+			_, _ = w.s.Write(bytes.Repeat(ampBytes, indirects))
+		}
+		_, _ = w.s.Write([]byte(ve.Type().String()))
+		if w.depth > 0 {
+			_, _ = w.s.Write(closeParenBytes)
+		}
+	} else {
+		if nilFound || cycleFound {
+			indirects += strings.Count(ve.Type().String(), "*")
+		}
+		_, _ = w.s.Write(openAngleBytes)
+		_, _ = w.s.Write([]byte(strings.Repeat("*", indirects)))
+		_, _ = w.s.Write(closeAngleBytes)
+	}
+
+	// Display pointer information depending on flags.
+	if w.s.Flag('+') && (len(pointerChain) > 0) {
+		_, _ = w.s.Write(openParenBytes)
+		for i, addr := range pointerChain {
+			if i > 0 {
+				_, _ = w.s.Write(pointerChainBytes)
+			}
+			getHexPtr(w.s, addr)
+		}
+		_, _ = w.s.Write(closeParenBytes)
+	}
+
+	// Display dereferenced value.
+	switch {
+	case nilFound:
+		_, _ = w.s.Write(nilAngleBytes)
+	case cycleFound:
+		_, _ = w.s.Write(circularShortBytes)
+	default:
+		w.ignoreNextType = true
+		w.format(ve)
+	}
+}
+
+// format is the main workhorse for providing the Formatter interface.  It
+// uses the passed reflect value to figure out what kind of object we are
+// dealing with and formats it appropriately.  It is a recursive function,
+// however circular data structures are detected and handled properly.
+func (w *Wrapper) format(v reflect.Value) {
+	if w.opts.Codec != nil {
+		buf, err := w.opts.Codec.Marshal(v.Interface())
+		if err != nil {
+			_, _ = w.s.Write(invalidAngleBytes)
+			return
+		}
+		_, _ = w.s.Write(buf)
+		return
+	}
+
+	// Handle invalid reflect values immediately.
+	kind := v.Kind()
+	if kind == reflect.Invalid {
+		_, _ = w.s.Write(invalidAngleBytes)
+		return
+	}
+
+	// Handle pointers specially.
+	switch kind {
+	case reflect.Ptr:
+		if !v.IsZero() {
+			if strings.HasPrefix(reflect.Indirect(v).Type().String(), "wrapperspb.") {
+				w.protoWrapperType = true
+			} else if strings.HasPrefix(reflect.Indirect(v).Type().String(), "sql.Null") {
+				w.sqlWrapperType = true
+			} else if v.CanInterface() {
+				if _, ok := v.Interface().(protoMessage); ok {
+					w.protoWrapperType = true
+				}
+			}
+		}
+		w.formatPtr(v)
+		return
+	case reflect.Struct:
+		if !v.IsZero() {
+			if strings.HasPrefix(reflect.Indirect(v).Type().String(), "sql.Null") {
+				w.sqlWrapperType = true
+			}
+		}
+	}
+
+	// get type information unless already handled elsewhere.
+	if !w.ignoreNextType && w.s.Flag('#') {
+		if v.Type().Kind() != reflect.Map &&
+			v.Type().Kind() != reflect.String &&
+			v.Type().Kind() != reflect.Array &&
+			v.Type().Kind() != reflect.Slice {
+			_, _ = w.s.Write(openParenBytes)
+		}
+		if v.Kind() != reflect.String {
+			_, _ = w.s.Write([]byte(v.Type().String()))
+		}
+		if v.Type().Kind() != reflect.Map &&
+			v.Type().Kind() != reflect.String &&
+			v.Type().Kind() != reflect.Array &&
+			v.Type().Kind() != reflect.Slice {
+			_, _ = w.s.Write(closeParenBytes)
+		}
+	}
+	w.ignoreNextType = false
+
+	// Call Stringer/error interfaces if they exist and the handle methods
+	// flag is enabled.
+	if w.opts.Methods {
+		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
+			if handled := handleMethods(w.opts, w.s, v); handled {
+				return
+			}
+		}
+	}
+
+	switch kind {
+	case reflect.Invalid:
+		_, _ = w.s.Write(invalidAngleBytes)
+	case reflect.Bool:
+		getBool(w.s, v.Bool())
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		getInt(w.s, v.Int(), 10)
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		getUint(w.s, v.Uint(), 10)
+	case reflect.Float32:
+		getFloat(w.s, v.Float(), 32)
+	case reflect.Float64:
+		getFloat(w.s, v.Float(), 64)
+	case reflect.Complex64:
+		getComplex(w.s, v.Complex(), 32)
+	case reflect.Complex128:
+		getComplex(w.s, v.Complex(), 64)
+	case reflect.Slice:
+		if v.IsNil() {
+			_, _ = w.s.Write(nilAngleBytes)
+			break
+		}
+		fallthrough
+	case reflect.Array:
+		_, _ = w.s.Write(openBraceBytes)
+		w.depth++
+		numEntries := v.Len()
+		for i := 0; i < numEntries; i++ {
+			if i > 0 {
+				_, _ = w.s.Write(commaBytes)
+				_, _ = w.s.Write(spaceBytes)
+			}
+			w.ignoreNextType = true
+			w.format(w.unpackValue(v.Index(i)))
+		}
+		w.depth--
+		_, _ = w.s.Write(closeBraceBytes)
+	case reflect.String:
+		_, _ = w.s.Write([]byte(`"` + v.String() + `"`))
+	case reflect.Interface:
+		// The only time we should get here is for nil interfaces due to
+		// unpackValue calls.
+		if v.IsNil() {
+			_, _ = w.s.Write(nilAngleBytes)
+		}
+	case reflect.Ptr:
+		// Do nothing.  We should never get here since pointers have already
+		// been handled above.
+	case reflect.Map:
+		// nil maps should be indicated as different than empty maps
+		if v.IsNil() {
+			_, _ = w.s.Write(nilAngleBytes)
+			break
+		}
+		_, _ = w.s.Write(openMapBytes)
+		w.depth++
+		keys := v.MapKeys()
+		for i, key := range keys {
+			if i > 0 {
+				_, _ = w.s.Write(spaceBytes)
+			}
+			w.ignoreNextType = true
+			w.format(w.unpackValue(key))
+			_, _ = w.s.Write(colonBytes)
+			w.ignoreNextType = true
+			w.format(w.unpackValue(v.MapIndex(key)))
+		}
+		w.depth--
+		_, _ = w.s.Write(closeMapBytes)
+	case reflect.Struct:
+
+		numFields := v.NumField()
+		numWritten := 0
+		_, _ = w.s.Write(openBraceBytes)
+		w.depth++
+
+		vt := v.Type()
+		prevSkip := false
+
+		for i := 0; i < numFields; i++ {
+			switch vt.Field(i).Type.PkgPath() {
+			case "google.golang.org/protobuf/internal/impl", "google.golang.org/protobuf/internal/pragma":
+				w.protoWrapperType = true
+				prevSkip = true
+				continue
+			}
+			if w.protoWrapperType && !vt.Field(i).IsExported() {
+				prevSkip = true
+				continue
+			} else if w.sqlWrapperType && vt.Field(i).Name == "Valid" {
+				prevSkip = true
+				continue
+			}
+			if _, ok := vt.Field(i).Tag.Lookup("protobuf"); ok && !w.protoWrapperType {
+				w.protoWrapperType = true
+			}
+			sv, ok := vt.Field(i).Tag.Lookup("logger")
+			switch {
+			case ok:
+				switch sv {
+				case "omit":
+					prevSkip = true
+					continue
+				case "take":
+					break
+				}
+			case !ok && w.opts.Tagged:
+				// skip top level untagged
+				if w.depth == 1 {
+					prevSkip = true
+					continue
+				}
+				if tv, ok := w.takeMap[w.depth]; ok && !tv {
+					prevSkip = true
+					continue
+				}
+			}
+
+			if prevSkip {
+				prevSkip = false
+			}
+
+			if numWritten > 0 {
+				_, _ = w.s.Write(commaBytes)
+				_, _ = w.s.Write(spaceBytes)
+			}
+
+			vt := vt.Field(i)
+			if w.s.Flag('+') || w.s.Flag('#') {
+				_, _ = w.s.Write([]byte(vt.Name))
+				_, _ = w.s.Write(colonBytes)
+			}
+			w.format(w.unpackValue(v.Field(i)))
+			numWritten++
+		}
+		w.depth--
+
+		if numWritten == 0 && w.depth < 0 {
+			_, _ = w.s.Write(filteredBytes)
+		}
+		_, _ = w.s.Write(closeBraceBytes)
+	case reflect.Uintptr:
+		getHexPtr(w.s, uintptr(v.Uint()))
+	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
+		getHexPtr(w.s, v.Pointer())
+	// There were not any other types at the time this code was written, but
+	// fall back to letting the default fmt package handle it if any get added.
+	default:
+		format := w.buildDefaultFormat()
+		if v.CanInterface() {
+			_, _ = fmt.Fprintf(w.s, format, v.Interface())
+		} else {
+			_, _ = fmt.Fprintf(w.s, format, v.String())
+		}
+	}
+}
+
+func (w *Wrapper) Format(s fmt.State, verb rune) {
+	w.s = s
+
+	// Use standard formatting for verbs that are not v.
+	if verb != 'v' {
+		format := w.constructOrigFormat(verb)
+		_, _ = fmt.Fprintf(s, format, w.val)
+		return
+	}
+
+	if w.val == nil {
+		if s.Flag('#') {
+			_, _ = s.Write(interfaceBytes)
+		}
+		_, _ = s.Write(nilAngleBytes)
+		return
+	}
+
+	if w.opts.Tagged {
+		w.buildTakeMap(reflect.ValueOf(w.val), 1)
+	}
+
+	w.format(reflect.ValueOf(w.val))
+}
+
+// handle special methods like error.Error() or fmt.Stringer interface
+func handleMethods(_ *Options, w io.Writer, v reflect.Value) (handled bool) {
+	if !v.CanInterface() {
+		// not our case
+		return false
+	}
+
+	if !v.CanAddr() {
+		// not our case
+		return false
+	}
+
+	if v.CanAddr() {
+		v = v.Addr()
+	}
+
+	// Is it an error or Stringer?
+	switch iface := v.Interface().(type) {
+	case error:
+		defer catchPanic(w, v)
+		_, _ = w.Write([]byte(iface.Error()))
+		return true
+	case fmt.Stringer:
+		defer catchPanic(w, v)
+		_, _ = w.Write([]byte(iface.String()))
+		return true
+	}
+
+	return false
+}
+
+// getBool outputs a boolean value as true or false to Writer w.
+func getBool(w io.Writer, val bool) {
+	if val {
+		_, _ = w.Write(trueBytes)
+	} else {
+		_, _ = w.Write(falseBytes)
+	}
+}
+
+// getInt outputs a signed integer value to Writer w.
+func getInt(w io.Writer, val int64, base int) {
+	_, _ = w.Write([]byte(strconv.FormatInt(val, base)))
+}
+
+// getUint outputs an unsigned integer value to Writer w.
+func getUint(w io.Writer, val uint64, base int) {
+	_, _ = w.Write([]byte(strconv.FormatUint(val, base)))
+}
+
+// getFloat outputs a floating point value using the specified precision,
+// which is expected to be 32 or 64bit, to Writer w.
+func getFloat(w io.Writer, val float64, precision int) {
+	_, _ = w.Write([]byte(strconv.FormatFloat(val, 'g', -1, precision)))
+}
+
+// getComplex outputs a complex value using the specified float precision
+// for the real and imaginary parts to Writer w.
+func getComplex(w io.Writer, c complex128, floatPrecision int) {
+	r := real(c)
+	_, _ = w.Write(openParenBytes)
+	_, _ = w.Write([]byte(strconv.FormatFloat(r, 'g', -1, floatPrecision)))
+	i := imag(c)
+	if i >= 0 {
+		_, _ = w.Write(plusBytes)
+	}
+	_, _ = w.Write([]byte(strconv.FormatFloat(i, 'g', -1, floatPrecision)))
+	_, _ = w.Write(iBytes)
+	_, _ = w.Write(closeParenBytes)
+}
+
+// getHexPtr outputs a uintptr formatted as hexadecimal with a leading '0x'
+// prefix to Writer w.
+func getHexPtr(w io.Writer, p uintptr) {
+	// Null pointer.
+	num := uint64(p)
+	if num == 0 {
+		_, _ = w.Write(nilAngleBytes)
+		return
+	}
+
+	// Max uint64 is 16 bytes in hex + 2 bytes for '0x' prefix
+	buf := make([]byte, 18)
+
+	// It's simpler to construct the hex string right to left.
+	base := uint64(16)
+	i := len(buf) - 1
+	for num >= base {
+		buf[i] = hexDigits[num%base]
+		num /= base
+		i--
+	}
+	buf[i] = hexDigits[num]
+
+	// Add '0x' prefix.
+	i--
+	buf[i] = 'x'
+	i--
+	buf[i] = '0'
+
+	// Strip unused leading bytes.
+	buf = buf[i:]
+	_, _ = w.Write(buf)
+}
+
+func catchPanic(w io.Writer, _ reflect.Value) {
+	if err := recover(); err != nil {
+		_, _ = w.Write(panicBytes)
+		_, _ = fmt.Fprintf(w, "%v", err)
+		_, _ = w.Write(closeParenBytes)
+	}
+}
+
+func (w *Wrapper) buildDefaultFormat() (format string) {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range sf {
+		if w.s.Flag(int(flag)) {
+			_, _ = buf.WriteRune(flag)
+		}
+	}
+
+	_, _ = buf.WriteRune('v')
+
+	format = buf.String()
+	return format
+}
+
+func (w *Wrapper) constructOrigFormat(verb rune) string {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range sf {
+		if w.s.Flag(int(flag)) {
+			_, _ = buf.WriteRune(flag)
+		}
+	}
+
+	if width, ok := w.s.Width(); ok {
+		_, _ = buf.WriteString(strconv.Itoa(width))
+	}
+
+	if precision, ok := w.s.Precision(); ok {
+		_, _ = buf.Write(precisionBytes)
+		_, _ = buf.WriteString(strconv.Itoa(precision))
+	}
+
+	_, _ = buf.WriteRune(verb)
+
+	return buf.String()
+}
+
+func (w *Wrapper) buildTakeMap(v reflect.Value, depth int) {
+	if !v.IsValid() || v.IsZero() {
+		return
+	}
+
+	switch v.Kind() {
+	case reflect.Slice, reflect.Array:
+		for i := 0; i < v.Len(); i++ {
+			w.buildTakeMap(v.Index(i), depth+1)
+		}
+		w.takeMap[depth] = true
+		return
+	case reflect.Struct:
+		break
+	case reflect.Ptr:
+		v = v.Elem()
+		if v.Kind() != reflect.Struct {
+			w.takeMap[depth] = true
+			return
+		}
+	default:
+		w.takeMap[depth] = true
+		return
+	}
+
+	vt := v.Type()
+
+	for i := 0; i < v.NumField(); i++ {
+		sv, ok := vt.Field(i).Tag.Lookup("logger")
+		if ok && sv == "take" {
+			w.takeMap[depth] = false
+		}
+		if v.Kind() == reflect.Struct ||
+			(v.Kind() == reflect.Ptr && v.Elem().Kind() == reflect.Struct) {
+			w.buildTakeMap(v.Field(i), depth+1)
+		}
+	}
+
+	if _, ok := w.takeMap[depth]; !ok {
+		w.takeMap[depth] = true
+	}
+}