Merge pull request 'tracer: add Flush method' (#224) from tracerimp into master

Reviewed-on: #224

.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: https://gitea.com/actions/setup-go@v3
+      with:
+        go-version: 1.18
+    - name: checkout
+      uses: https://gitea.com/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: https://gitea.com/actions/checkout@v3
+    - name: setup-go
+      uses: https://gitea.com/actions/setup-go@v3
+      with:
+        go-version: 1.18
+    - 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

@@ -1,59 +1,44 @@
 name: build
 on:
-  push:
+ push:
     branches:
     - master
+    - v3
 jobs:
   test:
     name: test
     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

@@ -9,7 +9,7 @@
 # the `language` matrix defined below to confirm you have the correct set of
 # supported CodeQL languages.
 #
-name: "CodeQL"
+name: "codeql"
 
 on:
   workflow_run:
@@ -17,16 +17,16 @@ on:
     types:
       - completed
   push:
-    branches: [ master ]
+    branches: [ master, v3 ]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ master ]
+    branches: [ master, v3 ]
   schedule:
     - cron: '34 1 * * 0'
 
 jobs:
   analyze:
-    name: Analyze
+    name: analyze
     runs-on: ubuntu-latest
     permissions:
       actions: read
@@ -42,12 +42,15 @@ jobs:
         # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
 
     steps:
-    - name: Checkout repository
+    - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
-
+    - name: setup
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.17
     # Initializes the CodeQL tools for scanning.
-    - name: Initialize CodeQL
+    - 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.
@@ -57,8 +60,8 @@ 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
+    - 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
@@ -71,5 +74,5 @@ jobs:
     #   make bootstrap
     #   make release
 
-    - name: Perform CodeQL Analysis
+    - name: analyze
-      uses: github/codeql-action/analyze@v1
+      uses: github/codeql-action/analyze@v2

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

@@ -0,0 +1,27 @@
+name: "dependabot-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 == 'dependabot[bot]'
+    steps:
+      - name: metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1.3.6
+        with:
+          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:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.TOKEN}}

.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/dependabot-automerge.yml

@@ -1,66 +0,0 @@
-name: "prautomerge"
-
-on:
-  workflow_run:
-    workflows: ["prbuild"]
-    types:
-      - completed
-
-permissions:
-  contents: write
-  pull-requests: write
-
-jobs:
-  Dependabot-Automerge:
-    runs-on: ubuntu-latest
-    # Contains workaround to execute if dependabot updates the PR by checking for the base branch in the linked PR
-    # The the github.event.workflow_run.event value is 'push' and not 'pull_request'
-    # dont work with multiple workflows when last returns success
-    if: >-
-      github.event.workflow_run.conclusion == 'success'
-      && github.actor == 'dependabot[bot]'
-      && github.event.sender.login == 'dependabot[bot]'
-      && github.event.sender.type == 'Bot'
-      && (github.event.workflow_run.event == 'pull_request'
-          || (github.event.workflow_run.event == 'push' && github.event.workflow_run.pull_requests[0].base.ref == github.event.repository.default_branch ))
-    steps:
-      - name: Approve Changes and Merge changes if label 'dependencies' is set
-        uses: actions/github-script@v5
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            console.log(context.payload.workflow_run);
-            
-            var labelNames = await github.paginate(
-              github.issues.listLabelsOnIssue,
-              {
-                repo: context.repo.repo,
-                owner: context.repo.owner,
-                issue_number: context.payload.workflow_run.pull_requests[0].number,
-              },
-              (response) => response.data.map(
-                (label) => label.name
-              )
-            );
-
-            console.log(labelNames);
-
-            if (labelNames.includes('dependencies')) {
-              console.log('Found label');
-
-              await github.pulls.createReview({
-                repo: context.repo.repo,
-                owner: context.repo.owner,
-                pull_number: context.payload.workflow_run.pull_requests[0].number,
-                event: 'APPROVE'
-              });
-              console.log('Approved PR');
-
-              await github.pulls.merge({
-                repo: context.repo.repo,
-                owner: context.repo.owner,
-                pull_number: context.payload.workflow_run.pull_requests[0].number,
-              });
-
-              console.log('Merged PR');
-            }

.github/workflows/pr.yml

@@ -1,62 +0,0 @@
-name: prbuild
-on:
-  pull_request:
-    branches:
-    - master
-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

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/go.unistack.org/micro/v4?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/v4)](https://goreportcard.com/report/go.unistack.org/micro/v4) [![Coverage](https://codecov.io/gh/unistack-org/micro/branch/v4/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

@@ -1,21 +1,24 @@
 // Package broker is an interface used for asynchronous messaging
-package broker // import "go.unistack.org/micro/v3/broker"
+package broker // import "go.unistack.org/micro/v4/broker"
 
 import (
 	"context"
 	"errors"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 // DefaultBroker default memory broker
-var DefaultBroker Broker = NewBroker()
+var DefaultBroker Broker // =  NewBroker()
 
 var (
 	// ErrNotConnected returns when broker used but not connected yet
 	ErrNotConnected = errors.New("broker not connected")
 	// ErrDisconnected returns when broker disconnected
 	ErrDisconnected = errors.New("broker disconnected")
+	// ErrInvalidMessage returns when message has nvalid format
+	ErrInvalidMessage = errors.New("broker message has invalid format")
 )
 
 // Broker is an interface used for asynchronous messaging.
@@ -32,89 +35,42 @@ type Broker interface {
 	Connect(ctx context.Context) error
 	// Disconnect disconnect from broker
 	Disconnect(ctx context.Context) error
+	// NewMessage creates new broker message
+	NewMessage(endpoint string, req interface{}, opts ...MessageOption) Message
 	// Publish message to broker topic
-	Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error
+	Publish(ctx context.Context, msg interface{}, opts ...PublishOption) error
 	// Subscribe subscribes to topic message via handler
-	Subscribe(ctx context.Context, topic string, h Handler, opts ...SubscribeOption) (Subscriber, error)
+	Subscribe(ctx context.Context, topic string, handler interface{}, opts ...SubscribeOption) (Subscriber, error)
-	// BatchPublish messages to broker with multiple topics
-	BatchPublish(ctx context.Context, msgs []*Message, opts ...PublishOption) error
-	// BatchSubscribe subscribes to topic messages via handler
-	BatchSubscribe(ctx context.Context, topic string, h BatchHandler, opts ...SubscribeOption) (Subscriber, error)
 	// String type of broker
 	String() string
 }
 
-// Handler is used to process messages via a subscription of a topic.
+// Message is given to a subscription handler for processing
-type Handler func(Event) error
+type Message interface {
-
+	// Context for the message
-// Events contains multiple events
+	Context() context.Context
-type Events []Event
-
-func (evs Events) Ack() error {
-	var err error
-	for _, ev := range evs {
-		if err = ev.Ack(); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-func (evs Events) SetError(err error) {
-	for _, ev := range evs {
-		ev.SetError(err)
-	}
-}
-
-// BatchHandler is used to process messages in batches via a subscription of a topic.
-type BatchHandler func(Events) error
-
-// Event is given to a subscription handler for processing
-type Event interface {
 	// Topic returns event topic
 	Topic() string
-	// Message returns broker message
+	// Body returns broker message
-	Message() *Message
+	Body() interface{}
 	// Ack acknowledge message
 	Ack() error
 	// Error returns message error (like decoding errors or some other)
+	// In this case Body contains raw []byte from broker
 	Error() error
-	// SetError set event processing error
-	SetError(err error)
 }
 
-// RawMessage is a raw encoded JSON value.
+// RawMessage is used to transfer data
-// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
+type RawMessage struct {
-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
-func NewMessage(topic string) *Message {
+func NewRawMessage(topic string) *RawMessage {
-	m := &Message{Header: metadata.New(2)}
+	m := &RawMessage{Header: metadata.New(2)}
 	m.Header.Set(metadata.HeaderTopic, topic)
 	return m
 }

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.go

@@ -1,15 +1,17 @@
+//go:build ignore
+
 package broker
 
 import (
 	"context"
 	"sync"
+	"time"
 
-	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v4/logger"
-	"go.unistack.org/micro/v3/metadata"
+	maddr "go.unistack.org/micro/v4/util/addr"
-	maddr "go.unistack.org/micro/v3/util/addr"
+	"go.unistack.org/micro/v4/util/id"
-	"go.unistack.org/micro/v3/util/id"
+	mnet "go.unistack.org/micro/v4/util/net"
-	mnet "go.unistack.org/micro/v3/util/net"
+	"go.unistack.org/micro/v4/util/rand"
-	"go.unistack.org/micro/v3/util/rand"
 )
 
 type memoryBroker struct {
@@ -20,23 +22,6 @@ type memoryBroker struct {
 	connected bool
 }
 
-type memoryEvent struct {
-	err     error
-	message interface{}
-	topic   string
-	opts    Options
-}
-
-type memorySubscriber struct {
-	ctx          context.Context
-	exit         chan bool
-	handler      Handler
-	batchhandler BatchHandler
-	id           string
-	topic        string
-	opts         SubscribeOptions
-}
-
 func (m *memoryBroker) Options() Options {
 	return m.opts
 }
@@ -88,16 +73,11 @@ func (m *memoryBroker) Init(opts ...Option) error {
 	return nil
 }
 
-func (m *memoryBroker) Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error {
+func (m *memoryBroker) NewMessage(endpoint string, req interface{}, opts ...MessageOption) Message {
-	msg.Header.Set(metadata.HeaderTopic, topic)
+	return &memoryMessage{}
-	return m.publish(ctx, []*Message{msg}, opts...)
 }
 
-func (m *memoryBroker) BatchPublish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
+func (m *memoryBroker) Publish(ctx context.Context, message interface{}, opts ...PublishOption) error {
-	return m.publish(ctx, msgs, opts...)
-}
-
-func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
@@ -112,128 +92,94 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 		return ctx.Err()
 	default:
 		options := NewPublishOptions(opts...)
-
+		var msgs []*memoryMessage
-		msgTopicMap := make(map[string]Events)
+		switch v := message.(type) {
-		for _, v := range msgs {
+		case *memoryMessage:
-			p := &memoryEvent{opts: m.opts}
+			msgs = []*memoryMessage{v}
-
+		case []*memoryMessage:
-			if m.opts.Codec == nil || options.BodyOnly {
+			msgs = v
-				p.topic, _ = v.Header.Get(metadata.HeaderTopic)
+		default:
-				p.message = v.Body
+			return ErrInvalidMessage
-			} else {
+		}
-				p.topic, _ = v.Header.Get(metadata.HeaderTopic)
+		msgTopicMap := make(map[string][]*memoryMessage)
-				p.message, err = m.opts.Codec.Marshal(v)
+		for _, msg := range msgs {
-				if err != nil {
+			p := &memoryMessage{opts: options}
-					return err
+			/*
+				if mb, ok := msg.Body().(*codec.Frame); ok {
+					p.message = v.Body
+				} else {
+					p.topic, _ = v.Header.Get(metadata.HeaderTopic)
+					p.message, err = m.opts.Codec.Marshal(v)
+					if err != nil {
+						return err
+					}
 				}
-			}
+			*/
-			msgTopicMap[p.topic] = append(msgTopicMap[p.topic], p)
+			msgTopicMap[msg.Topic()] = append(msgTopicMap[p.topic], p)
 		}
 
-		beh := m.opts.BatchErrorHandler
 		eh := m.opts.ErrorHandler
 
 		for t, ms := range msgTopicMap {
+			ts := time.Now()
+
+			m.opts.Meter.Counter(PublishMessageInflight, "endpoint", t).Add(len(ms))
+			m.opts.Meter.Counter(SubscribeMessageInflight, "endpoint", t).Add(len(ms))
+
 			m.RLock()
 			subs, ok := m.subscribers[t]
 			m.RUnlock()
 			if !ok {
+				m.opts.Meter.Counter(PublishMessageTotal, "endpoint", t, "status", "failure").Add(len(ms))
+				m.opts.Meter.Counter(PublishMessageInflight, "endpoint", t).Add(-len(ms))
+				m.opts.Meter.Counter(SubscribeMessageInflight, "endpoint", t).Add(-len(ms))
 				continue
 			}
 
+			m.opts.Meter.Counter(PublishMessageTotal, "endpoint", t, "status", "success").Add(len(ms))
 			for _, sub := range subs {
-				if sub.opts.BatchErrorHandler != nil {
-					beh = sub.opts.BatchErrorHandler
-				}
 				if sub.opts.ErrorHandler != nil {
 					eh = sub.opts.ErrorHandler
 				}
 
-				switch {
+				for _, p := range ms {
-				// batch processing
+					if err = sub.handler(p); err != nil {
-				case sub.batchhandler != nil:
+						m.opts.Meter.Counter(SubscribeMessageTotal, "endpoint", t, "status", "failure").Inc()
-					if err = sub.batchhandler(ms); err != nil {
+						if eh != nil {
-						ms.SetError(err)
+							_ = eh(p)
-						if beh != nil {
-							_ = beh(ms)
 						} else if m.opts.Logger.V(logger.ErrorLevel) {
 							m.opts.Logger.Error(m.opts.Context, err.Error())
 						}
-					} else if sub.opts.AutoAck {
+					} else {
-						if err = ms.Ack(); err != nil {
+						if sub.opts.AutoAck {
-							m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
-						}
-					}
-					// single processing
-				case sub.handler != nil:
-					for _, p := range ms {
-						if err = sub.handler(p); err != nil {
-							p.SetError(err)
-							if eh != nil {
-								_ = eh(p)
-							} else if m.opts.Logger.V(logger.ErrorLevel) {
-								m.opts.Logger.Error(m.opts.Context, err.Error())
-							}
-						} else if sub.opts.AutoAck {
 							if err = p.Ack(); err != nil {
 								m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
+								m.opts.Meter.Counter(SubscribeMessageTotal, "endpoint", t, "status", "failure").Inc()
+							} else {
+								m.opts.Meter.Counter(SubscribeMessageTotal, "endpoint", t, "status", "success").Inc()
 							}
+						} else {
+							m.opts.Meter.Counter(SubscribeMessageTotal, "endpoint", t, "status", "success").Inc()
 						}
 					}
+					m.opts.Meter.Counter(PublishMessageInflight, "endpoint", t).Add(-1)
+					m.opts.Meter.Counter(SubscribeMessageInflight, "endpoint", t).Add(-1)
 				}
+
 			}
+			te := time.Since(ts)
+			m.opts.Meter.Summary(PublishMessageLatencyMicroseconds, "endpoint", t).Update(te.Seconds())
+			m.opts.Meter.Histogram(PublishMessageDurationSeconds, "endpoint", t).Update(te.Seconds())
+			m.opts.Meter.Summary(SubscribeMessageLatencyMicroseconds, "endpoint", t).Update(te.Seconds())
+			m.opts.Meter.Histogram(SubscribeMessageDurationSeconds, "endpoint", t).Update(te.Seconds())
 		}
+
 	}
 
 	return nil
 }
 
-func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler BatchHandler, opts ...SubscribeOption) (Subscriber, error) {
+func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler interface{}, opts ...SubscribeOption) (Subscriber, error) {
-	m.RLock()
-	if !m.connected {
-		m.RUnlock()
-		return nil, ErrNotConnected
-	}
-	m.RUnlock()
-
-	sid, err := id.New()
-	if err != nil {
-		return nil, err
-	}
-
-	options := NewSubscribeOptions(opts...)
-
-	sub := &memorySubscriber{
-		exit:         make(chan bool, 1),
-		id:           sid,
-		topic:        topic,
-		batchhandler: handler,
-		opts:         options,
-		ctx:          ctx,
-	}
-
-	m.Lock()
-	m.subscribers[topic] = append(m.subscribers[topic], sub)
-	m.Unlock()
-
-	go func() {
-		<-sub.exit
-		m.Lock()
-		newSubscribers := make([]*memorySubscriber, 0, len(m.subscribers)-1)
-		for _, sb := range m.subscribers[topic] {
-			if sb.id == sub.id {
-				continue
-			}
-			newSubscribers = append(newSubscribers, sb)
-		}
-		m.subscribers[topic] = newSubscribers
-		m.Unlock()
-	}()
-
-	return sub, nil
-}
-
-func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
@@ -286,38 +232,41 @@ func (m *memoryBroker) Name() string {
 	return m.opts.Name
 }
 
-func (m *memoryEvent) Topic() string {
+type memoryMessage struct {
+	err   error
+	body  interface{}
+	topic string
+	opts  PublishOptions
+	ctx   context.Context
+}
+
+func (m *memoryMessage) Topic() string {
 	return m.topic
 }
 
-func (m *memoryEvent) Message() *Message {
+func (m *memoryMessage) Body() interface{} {
-	switch v := m.message.(type) {
+	return m.body
-	case *Message:
+}
-		return v
-	case []byte:
-		msg := &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)
-			}
-			return nil
-		}
-		return msg
-	}
 
+func (m *memoryMessage) Ack() error {
 	return nil
 }
 
-func (m *memoryEvent) Ack() error {
+func (m *memoryMessage) Error() error {
-	return nil
-}
-
-func (m *memoryEvent) Error() error {
 	return m.err
 }
 
-func (m *memoryEvent) SetError(err error) {
+func (m *memoryMessage) Context() context.Context {
-	m.err = err
+	return m.ctx
+}
+
+type memorySubscriber struct {
+	ctx     context.Context
+	exit    chan bool
+	handler interface{}
+	id      string
+	topic   string
+	opts    SubscribeOptions
 }
 
 func (m *memorySubscriber) Options() SubscribeOptions {
@@ -334,7 +283,7 @@ func (m *memorySubscriber) Unsubscribe(ctx context.Context) error {
 }
 
 // NewBroker return new memory broker
-func NewBroker(opts ...Option) Broker {
+func NewBroker(opts ...Option) *memoryBroker {
 	return &memoryBroker{
 		opts:        NewOptions(opts...),
 		subscribers: make(map[string][]*memorySubscriber),

broker/memory_test.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"testing"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 func TestMemoryBatchBroker(t *testing.T) {

broker/options.go

@@ -5,11 +5,31 @@ import (
 	"crypto/tls"
 	"time"
 
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/codec"
-	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v4/logger"
-	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v4/metadata"
-	"go.unistack.org/micro/v3/register"
+	"go.unistack.org/micro/v4/meter"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/tracer"
+)
+
+var (
+	// PublishMessageDurationSeconds specifies meter metric name
+	PublishMessageDurationSeconds = "publish_message_duration_seconds"
+	// PublishMessageLatencyMicroseconds specifies meter metric name
+	PublishMessageLatencyMicroseconds = "publish_message_latency_microseconds"
+	// PublishMessageTotal specifies meter metric name
+	PublishMessageTotal = "publish_message_total"
+	// PublishMessageInflight specifies meter metric name
+	PublishMessageInflight = "publish_message_inflight"
+	// SubscribeMessageDurationSeconds specifies meter metric name
+	SubscribeMessageDurationSeconds = "subscribe_message_duration_seconds"
+	// SubscribeMessageLatencyMicroseconds specifies meter metric name
+	SubscribeMessageLatencyMicroseconds = "subscribe_message_latency_microseconds"
+	// SubscribeMessageTotal specifies meter metric name
+	SubscribeMessageTotal = "subscribe_message_total"
+	// SubscribeMessageInflight specifies meter metric name
+	SubscribeMessageInflight = "subscribe_message_inflight"
 )
 
 // Options struct
@@ -18,8 +38,8 @@ type Options struct {
 	Tracer tracer.Tracer
 	// Register can be used for clustering
 	Register register.Register
-	// Codec holds the codec for marshal/unmarshal
+	// Codecs holds the codec for marshal/unmarshal
-	Codec codec.Codec
+	Codecs map[string]codec.Codec
 	// Logger used for logging
 	Logger logger.Logger
 	// Meter used for metrics
@@ -29,15 +49,16 @@ type Options struct {
 	// TLSConfig holds tls.TLSConfig options
 	TLSConfig *tls.Config
 	// ErrorHandler used when broker can't unmarshal incoming message
-	ErrorHandler Handler
+	ErrorHandler func(Message)
-	// BatchErrorHandler used when broker can't unmashal incoming messages
-	BatchErrorHandler BatchHandler
 	// Name holds the broker name
 	Name string
 	// Addrs holds the broker address
 	Addrs []string
 }
 
+// Option func
+type Option func(*Options)
+
 // NewOptions create new Options
 func NewOptions(opts ...Option) Options {
 	options := Options{
@@ -45,7 +66,7 @@ func NewOptions(opts ...Option) Options {
 		Logger:   logger.DefaultLogger,
 		Context:  context.Background(),
 		Meter:    meter.DefaultMeter,
-		Codec:    codec.DefaultCodec,
+		Codecs:   make(map[string]codec.Codec),
 		Tracer:   tracer.DefaultTracer,
 	}
 	for _, o := range opts {
@@ -61,6 +82,32 @@ func Context(ctx context.Context) Option {
 	}
 }
 
+// MessageOption func
+type MessageOption func(*MessageOptions)
+
+// MessageOptions struct
+type MessageOptions struct {
+	Metadata    metadata.Metadata
+	ContentType string
+}
+
+// MessageMetadata pass additional message metadata
+func MessageMetadata(md metadata.Metadata) MessageOption {
+	return func(o *MessageOptions) {
+		o.Metadata = md
+	}
+}
+
+// MessageContentType pass ContentType for message data
+func MessageContentType(ct string) MessageOption {
+	return func(o *MessageOptions) {
+		o.ContentType = ct
+	}
+}
+
+// PublishOption func
+type PublishOption func(*PublishOptions)
+
 // PublishOptions struct
 type PublishOptions struct {
 	// Context holds external options
@@ -85,11 +132,9 @@ type SubscribeOptions struct {
 	// Context holds external options
 	Context context.Context
 	// ErrorHandler used when broker can't unmarshal incoming message
-	ErrorHandler Handler
+	ErrorHandler func(Message)
-	// BatchErrorHandler used when broker can't unmashal incoming messages
+	// QueueGroup holds consumer group
-	BatchErrorHandler BatchHandler
+	QueueGroup string
-	// Group holds consumer group
-	Group string
 	// AutoAck flag specifies auto ack of incoming message when no error happens
 	AutoAck bool
 	// BodyOnly flag specifies that message contains only body bytes without header
@@ -100,12 +145,6 @@ type SubscribeOptions struct {
 	BatchWait time.Duration
 }
 
-// Option func
-type Option func(*Options)
-
-// PublishOption func
-type PublishOption func(*PublishOptions)
-
 // PublishBodyOnly publish only body of the message
 func PublishBodyOnly(b bool) PublishOption {
 	return func(o *PublishOptions) {
@@ -129,59 +168,29 @@ func Addrs(addrs ...string) Option {
 
 // Codec sets the codec used for encoding/decoding used where
 // a broker does not support headers
-func Codec(c codec.Codec) Option {
+// Codec to be used to encode/decode requests for a given content type
+func Codec(contentType string, c codec.Codec) Option {
 	return func(o *Options) {
-		o.Codec = c
+		o.Codecs[contentType] = c
 	}
 }
 
 // ErrorHandler will catch all broker errors that cant be handled
 // in normal way, for example Codec errors
-func ErrorHandler(h Handler) Option {
+func ErrorHandler(h func(Message)) Option {
 	return func(o *Options) {
 		o.ErrorHandler = h
 	}
 }
 
-// BatchErrorHandler will catch all broker errors that cant be handled
-// in normal way, for example Codec errors
-func BatchErrorHandler(h BatchHandler) Option {
-	return func(o *Options) {
-		o.BatchErrorHandler = h
-	}
-}
-
 // SubscribeErrorHandler will catch all broker errors that cant be handled
 // in normal way, for example Codec errors
-func SubscribeErrorHandler(h Handler) SubscribeOption {
+func SubscribeErrorHandler(h func(Message)) SubscribeOption {
 	return func(o *SubscribeOptions) {
 		o.ErrorHandler = h
 	}
 }
 
-// SubscribeBatchErrorHandler will catch all broker errors that cant be handled
-// in normal way, for example Codec errors
-func SubscribeBatchErrorHandler(h BatchHandler) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.BatchErrorHandler = h
-	}
-}
-
-// Queue sets the subscribers queue
-// Deprecated
-func Queue(name string) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.Group = name
-	}
-}
-
-// SubscribeGroup sets the name of the queue to share messages on
-func SubscribeGroup(name string) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.Group = name
-	}
-}
-
 // Register sets register option
 func Register(r register.Register) Option {
 	return func(o *Options) {
@@ -224,6 +233,21 @@ func Name(n string) Option {
 	}
 }
 
+// SubscribeOption func signature
+type SubscribeOption func(*SubscribeOptions)
+
+// NewSubscribeOptions creates new SubscribeOptions
+func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
+	options := SubscribeOptions{
+		AutoAck: true,
+		Context: context.Background(),
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
 // SubscribeContext set context
 func SubscribeContext(ctx context.Context) SubscribeOption {
 	return func(o *SubscribeOptions) {
@@ -231,14 +255,6 @@ func SubscribeContext(ctx context.Context) SubscribeOption {
 	}
 }
 
-// DisableAutoAck disables auto ack
-// Deprecated
-func DisableAutoAck() SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.AutoAck = false
-	}
-}
-
 // SubscribeAutoAck contol auto acking of messages
 // after they have been handled.
 func SubscribeAutoAck(b bool) SubscribeOption {
@@ -268,17 +284,16 @@ func SubscribeBatchWait(td time.Duration) SubscribeOption {
 	}
 }
 
-// SubscribeOption func
+// SubscribeQueueGroup sets the shared queue name distributed messages across subscribers
-type SubscribeOption func(*SubscribeOptions)
+func SubscribeQueueGroup(n string) SubscribeOption {
-
+	return func(o *SubscribeOptions) {
-// NewSubscribeOptions creates new SubscribeOptions
+		o.QueueGroup = n
-func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
+	}
-	options := SubscribeOptions{
+}
-		AutoAck: true,
+
-		Context: context.Background(),
+// SubscribeAutoAck control auto ack processing for handler
+func SubscribeAuthAck(b bool) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.AutoAck = b
 	}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
 }

broker/subscriber.go

@@ -0,0 +1,98 @@
+package broker
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+const (
+	subSig      = "func(context.Context, interface{}) error"
+	batchSubSig = "func([]context.Context, []interface{}) error"
+)
+
+// Precompute the reflect type for error. Can't use error directly
+// because Typeof takes an empty interface value. This is annoying.
+var typeOfError = reflect.TypeOf((*error)(nil)).Elem()
+
+// Is this an exported - upper case - name?
+func isExported(name string) bool {
+	rune, _ := utf8.DecodeRuneInString(name)
+	return unicode.IsUpper(rune)
+}
+
+// Is this type exported or a builtin?
+func isExportedOrBuiltinType(t reflect.Type) bool {
+	for t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+	// PkgPath will be non-empty even for an exported type,
+	// so we need to check the type name as well.
+	return isExported(t.Name()) || t.PkgPath() == ""
+}
+
+// ValidateSubscriber func signature
+func ValidateSubscriber(sub interface{}) error {
+	typ := reflect.TypeOf(sub)
+	var argType reflect.Type
+	switch typ.Kind() {
+	case reflect.Func:
+		name := "Func"
+		switch typ.NumIn() {
+		case 1: // func(Message) error
+
+		case 2: // func(context.Context, Message) error or func(context.Context, []Message) error
+			argType = typ.In(2)
+			// if sub.Options().Batch {
+			if argType.Kind() != reflect.Slice {
+				return fmt.Errorf("subscriber %v dont have required signature %s", name, batchSubSig)
+			}
+			if strings.Compare(fmt.Sprintf("%v", argType), "[]interface{}") == 0 {
+				return fmt.Errorf("subscriber %v dont have required signaure %s", name, batchSubSig)
+			}
+		//	}
+		default:
+			return fmt.Errorf("subscriber %v takes wrong number of args: %v required signature %s or %s", name, typ.NumIn(), subSig, batchSubSig)
+		}
+		if !isExportedOrBuiltinType(argType) {
+			return fmt.Errorf("subscriber %v argument type not exported: %v", name, argType)
+		}
+		if typ.NumOut() != 1 {
+			return fmt.Errorf("subscriber %v has wrong number of return values: %v require signature %s or %s",
+				name, typ.NumOut(), subSig, batchSubSig)
+		}
+		if returnType := typ.Out(0); returnType != typeOfError {
+			return fmt.Errorf("subscriber %v returns %v not error", name, returnType.String())
+		}
+	default:
+		hdlr := reflect.ValueOf(sub)
+		name := reflect.Indirect(hdlr).Type().Name()
+
+		for m := 0; m < typ.NumMethod(); m++ {
+			method := typ.Method(m)
+			switch method.Type.NumIn() {
+			case 3:
+				argType = method.Type.In(2)
+			default:
+				return fmt.Errorf("subscriber %v.%v takes wrong number of args: %v required signature %s or %s",
+					name, method.Name, method.Type.NumIn(), subSig, batchSubSig)
+			}
+
+			if !isExportedOrBuiltinType(argType) {
+				return fmt.Errorf("%v argument type not exported: %v", name, argType)
+			}
+			if method.Type.NumOut() != 1 {
+				return fmt.Errorf(
+					"subscriber %v.%v has wrong number of return values: %v require signature %s or %s",
+					name, method.Name, method.Type.NumOut(), subSig, batchSubSig)
+			}
+			if returnType := method.Type.Out(0); returnType != typeOfError {
+				return fmt.Errorf("subscriber %v.%v returns %v not error", name, method.Name, returnType.String())
+			}
+		}
+	}
+
+	return nil
+}

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

@@ -2,14 +2,29 @@ package client
 
 import (
 	"context"
+	"math"
 	"time"
 
-	"go.unistack.org/micro/v3/util/backoff"
+	"go.unistack.org/micro/v4/util/backoff"
 )
 
 // 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

@@ -1,21 +1,20 @@
 // Package client is an interface for an RPC client
-package client // import "go.unistack.org/micro/v3/client"
+package client // import "go.unistack.org/micro/v4/client"
 
 import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/codec"
-	"go.unistack.org/micro/v3/metadata"
 )
 
 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
@@ -35,22 +34,12 @@ type Client interface {
 	Name() string
 	Init(opts ...Option) error
 	Options() Options
-	NewMessage(topic string, msg interface{}, opts ...MessageOption) Message
 	NewRequest(service string, endpoint string, req interface{}, opts ...RequestOption) Request
 	Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
 	Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error)
-	Publish(ctx context.Context, msg Message, opts ...PublishOption) error
-	BatchPublish(ctx context.Context, msg []Message, opts ...PublishOption) error
 	String() string
 }
 
-// Message is the interface for publishing asynchronously
-type Message interface {
-	Topic() string
-	Payload() interface{}
-	ContentType() string
-}
-
 // Request is the interface for a synchronous request used by Call or Stream
 type Request interface {
 	// The service to call
@@ -67,16 +56,22 @@ type Request interface {
 	Codec() codec.Codec
 	// indicates whether the request will be a streaming one rather than unary
 	Stream() bool
+	// Header data
+	// Header() metadata.Metadata
 }
 
 // Response is the response received from a service
 type Response interface {
 	// Read the response
 	Codec() codec.Codec
-	// read the header
+	// The content type
-	Header() metadata.Metadata
+	// ContentType() string
+	// Header data
+	// Header() metadata.Metadata
 	// Read the undecoded response
 	Read() ([]byte, error)
+	// The unencoded request body
+	// Body() interface{}
 }
 
 // Stream is the interface for a bidirectional synchronous stream
@@ -91,10 +86,16 @@ 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/client_call_options_test.go

@@ -0,0 +1,26 @@
+package client
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+func TestNewClientCallOptions(t *testing.T) {
+	var flag bool
+	w := func(fn CallFunc) CallFunc {
+		flag = true
+		return fn
+	}
+	c := NewClientCallOptions(NewClient(),
+		WithAddress("127.0.0.1"),
+		WithCallWrapper(w),
+		WithRequestTimeout(1*time.Millisecond),
+		WithRetries(0),
+		WithBackoff(BackoffInterval(10*time.Millisecond, 100*time.Millisecond)),
+	)
+	_ = c.Call(context.TODO(), c.NewRequest("service", "endpoint", nil), nil)
+	if !flag {
+		t.Fatalf("NewClientCallOptions not works")
+	}
+}

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/lookup.go

@@ -4,15 +4,15 @@ import (
 	"context"
 	"sort"
 
-	"go.unistack.org/micro/v3/errors"
+	"go.unistack.org/micro/v4/errors"
-	"go.unistack.org/micro/v3/router"
+	"go.unistack.org/micro/v4/router"
 )
 
 // LookupFunc is used to lookup routes for a service
 type LookupFunc func(context.Context, Request, CallOptions) ([]string, error)
 
 // LookupRoute for a request using the router and then choose one using the selector
-func LookupRoute(ctx context.Context, req Request, opts CallOptions) ([]string, error) {
+func LookupRoute(_ context.Context, req Request, opts CallOptions) ([]string, error) {
 	// check to see if an address was provided as a call option
 	if len(opts.Address) > 0 {
 		return opts.Address, nil

client/noop.go

@@ -2,11 +2,13 @@ package client
 
 import (
 	"context"
+	"fmt"
+	"time"
 
-	"go.unistack.org/micro/v3/broker"
+	"go.unistack.org/micro/v4/codec"
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/errors"
-	"go.unistack.org/micro/v3/errors"
+	"go.unistack.org/micro/v4/metadata"
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/selector"
 )
 
 // DefaultCodecs will be used to encode/decode data
@@ -119,6 +121,14 @@ func (n *noopStream) Recv(interface{}) error {
 	return nil
 }
 
+func (n *noopStream) SendMsg(interface{}) error {
+	return nil
+}
+
+func (n *noopStream) RecvMsg(interface{}) error {
+	return nil
+}
+
 func (n *noopStream) Error() error {
 	return nil
 }
@@ -127,6 +137,10 @@ func (n *noopStream) Close() error {
 	return nil
 }
 
+func (n *noopStream) CloseSend() error {
+	return nil
+}
+
 func (n *noopMessage) Topic() string {
 	return n.topic
 }
@@ -139,6 +153,10 @@ func (n *noopMessage) ContentType() string {
 	return n.opts.ContentType
 }
 
+func (n *noopMessage) Metadata() metadata.Metadata {
+	return n.opts.Metadata
+}
+
 func (n *noopClient) newCodec(contentType string) (codec.Codec, error) {
 	if cf, ok := n.opts.Codecs[contentType]; ok {
 		return cf, nil
@@ -165,6 +183,151 @@ func (n *noopClient) String() string {
 }
 
 func (n *noopClient) Call(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 := n.call
+
+	// wrap the call in reverse
+	for i := len(callOpts.CallWrappers); i > 0; i-- {
+		hcall = callOpts.CallWrappers[i-1](hcall)
+	}
+
+	// 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
+
+	ts := time.Now()
+	endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+	n.opts.Meter.Counter(ClientRequestInflight, "endpoint", endpoint).Inc()
+	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
+		}
+	}
+
+	if gerr != nil {
+		n.opts.Meter.Counter(ClientRequestTotal, "endpoint", endpoint, "status", "failure").Inc()
+	} else {
+		n.opts.Meter.Counter(ClientRequestTotal, "endpoint", endpoint, "status", "success").Inc()
+	}
+	n.opts.Meter.Counter(ClientRequestInflight, "endpoint", endpoint).Dec()
+	te := time.Since(ts)
+	n.opts.Meter.Summary(ClientRequestLatencyMicroseconds, "endpoint", endpoint).Update(te.Seconds())
+	n.opts.Meter.Histogram(ClientRequestDurationSeconds, "endpoint", endpoint).Update(te.Seconds())
+
+	return gerr
+}
+
+func (n *noopClient) call(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error {
 	return nil
 }
 
@@ -172,69 +335,154 @@ func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts
 	return &noopRequest{service: service, endpoint: endpoint}
 }
 
-func (n *noopClient) NewMessage(topic string, msg interface{}, opts ...MessageOption) Message {
-	options := NewMessageOptions(append([]MessageOption{MessageContentType(n.opts.ContentType)}, opts...)...)
-	return &noopMessage{topic: topic, payload: msg, opts: options}
-}
-
 func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
-	return &noopStream{}, nil
+	var err error
-}
 
-func (n *noopClient) BatchPublish(ctx context.Context, ps []Message, opts ...PublishOption) error {
+	// make a copy of call opts
-	return n.publish(ctx, ps, opts...)
+	callOpts := n.opts.CallOptions
-}
+	for _, o := range opts {
-
+		o(&callOpts)
-func (n *noopClient) Publish(ctx context.Context, p Message, opts ...PublishOption) error {
-	return n.publish(ctx, []Message{p}, opts...)
-}
-
-func (n *noopClient) publish(ctx context.Context, ps []Message, opts ...PublishOption) error {
-	options := NewPublishOptions(opts...)
-
-	msgs := make([]*broker.Message, 0, len(ps))
-
-	for _, p := range ps {
-		md, ok := metadata.FromOutgoingContext(ctx)
-		if !ok {
-			md = metadata.New(0)
-		}
-		md[metadata.HeaderContentType] = p.ContentType()
-
-		topic := p.Topic()
-
-		// get the exchange
-		if len(options.Exchange) > 0 {
-			topic = options.Exchange
-		}
-
-		md[metadata.HeaderTopic] = topic
-
-		var body []byte
-
-		// passed in raw data
-		if d, ok := p.Payload().(*codec.Frame); ok {
-			body = d.Data
-		} else {
-			// use codec for payload
-			cf, err := n.newCodec(p.ContentType())
-			if err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-
-			// set the body
-			b, err := cf.Marshal(p.Payload())
-			if err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-			body = b
-		}
-
-		msgs = append(msgs, &broker.Message{Header: md, Body: body})
 	}
 
-	return n.opts.Broker.BatchPublish(ctx, msgs,
+	// check if we already have a deadline
-		broker.PublishContext(options.Context),
+	d, ok := ctx.Deadline()
-		broker.PublishBodyOnly(options.BodyOnly),
+	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()
+
+		// ts := time.Now()
+		endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+		n.opts.Meter.Counter(ClientRequestInflight, "endpoint", endpoint).Inc()
+		stream, cerr := n.stream(ctx, node, req, callOpts)
+		if cerr != nil {
+			n.opts.Meter.Counter(ClientRequestTotal, "endpoint", endpoint, "status", "failure").Inc()
+		} else {
+			n.opts.Meter.Counter(ClientRequestTotal, "endpoint", endpoint, "status", "success").Inc()
+		}
+
+		// 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) (*noopStream, error) {
+	return &noopStream{}, nil
 }

client/options.go

@@ -3,18 +3,30 @@ package client
 import (
 	"context"
 	"crypto/tls"
+	"net"
 	"time"
 
-	"go.unistack.org/micro/v3/broker"
+	"go.unistack.org/micro/v4/codec"
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/logger"
-	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v4/metadata"
-	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v4/meter"
-	"go.unistack.org/micro/v3/network/transport"
+	"go.unistack.org/micro/v4/network/transport"
-	"go.unistack.org/micro/v3/register"
+	"go.unistack.org/micro/v4/register"
-	"go.unistack.org/micro/v3/router"
+	"go.unistack.org/micro/v4/router"
-	"go.unistack.org/micro/v3/selector"
+	"go.unistack.org/micro/v4/selector"
-	"go.unistack.org/micro/v3/selector/random"
+	"go.unistack.org/micro/v4/selector/random"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/tracer"
+)
+
+var (
+	// ClientRequestDurationSeconds specifies meter metric name
+	ClientRequestDurationSeconds = "client_request_duration_seconds"
+	// ClientRequestLatencyMicroseconds specifies meter metric name
+	ClientRequestLatencyMicroseconds = "client_request_latency_microseconds"
+	// ClientRequestTotal specifies meter metric name
+	ClientRequestTotal = "client_request_total"
+	// ClientRequestInflight specifies meter metric name
+	ClientRequestInflight = "client_request_inflight"
 )
 
 // Options holds client options
@@ -27,8 +39,6 @@ type Options struct {
 	Logger logger.Logger
 	// Tracer used for tracing
 	Tracer tracer.Tracer
-	// Broker used to publish messages
-	Broker broker.Broker
 	// Meter used for metrics
 	Meter meter.Meter
 	// Context is used for external options
@@ -55,6 +65,8 @@ type Options struct {
 	PoolSize int
 	// PoolTTL connection pool ttl
 	PoolTTL time.Duration
+	// ContextDialer used to connect
+	ContextDialer func(context.Context, string) (net.Conn, error)
 }
 
 // NewCallOptions creates new call options struct
@@ -94,10 +106,23 @@ type CallOptions struct {
 	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
@@ -128,7 +153,7 @@ type PublishOptions struct {
 
 // NewMessageOptions creates message options struct
 func NewMessageOptions(opts ...MessageOption) MessageOptions {
-	options := MessageOptions{}
+	options := MessageOptions{Metadata: metadata.New(1)}
 	for _, o := range opts {
 		o(&options)
 	}
@@ -137,7 +162,10 @@ func NewMessageOptions(opts ...MessageOption) MessageOptions {
 
 // MessageOptions holds client message options
 type MessageOptions struct {
+	// Metadata additional metadata
+	Metadata metadata.Metadata
 	// ContentType specify content-type of message
+	// deprecated
 	ContentType string
 }
 
@@ -179,7 +207,6 @@ func NewOptions(opts ...Option) Options {
 		PoolTTL:   DefaultPoolTTL,
 		Selector:  random.NewSelector(),
 		Logger:    logger.DefaultLogger,
-		Broker:    broker.DefaultBroker,
 		Meter:     meter.DefaultMeter,
 		Tracer:    tracer.DefaultTracer,
 		Router:    router.DefaultRouter,
@@ -193,13 +220,6 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
-// Broker to be used for pub/sub
-func Broker(b broker.Broker) Option {
-	return func(o *Options) {
-		o.Broker = b
-	}
-}
-
 // Tracer to be used for tracing
 func Tracer(t tracer.Tracer) Option {
 	return func(o *Options) {
@@ -409,6 +429,13 @@ 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) {
@@ -454,6 +481,20 @@ 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 {
@@ -517,6 +558,7 @@ func WithSelectOptions(sops ...selector.SelectOption) CallOption {
 // Deprecated
 func WithMessageContentType(ct string) MessageOption {
 	return func(o *MessageOptions) {
+		o.Metadata.Set(metadata.HeaderContentType, ct)
 		o.ContentType = ct
 	}
 }
@@ -524,10 +566,18 @@ func WithMessageContentType(ct string) MessageOption {
 // MessageContentType sets the message content type
 func MessageContentType(ct string) MessageOption {
 	return func(o *MessageOptions) {
+		o.Metadata.Set(metadata.HeaderContentType, ct)
 		o.ContentType = ct
 	}
 }
 
+// MessageMetadata sets the message metadata
+func MessageMetadata(k, v string) MessageOption {
+	return func(o *MessageOptions) {
+		o.Metadata.Set(k, v)
+	}
+}
+
 // StreamingRequest specifies that request is streaming
 func StreamingRequest(b bool) RequestOption {
 	return func(o *RequestOptions) {

client/retry.go

@@ -3,7 +3,7 @@ package client
 import (
 	"context"
 
-	"go.unistack.org/micro/v3/errors"
+	"go.unistack.org/micro/v4/errors"
 )
 
 // RetryFunc that returning either false or a non-nil error will result in the call not being retried
@@ -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(ctx context.Context, req Request, retryCount int, err error) (bool, 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/v4/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")
+		}
+	}
+}

client/test_request.go

@@ -1,7 +1,7 @@
 package client
 
 import (
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/codec"
 )
 
 type testRequest struct {

codec/codec.go

@@ -1,11 +1,11 @@
 // Package codec is an interface for encoding messages
-package codec // import "go.unistack.org/micro/v3/codec"
+package codec // import "go.unistack.org/micro/v4/codec"
 
 import (
 	"errors"
 	"io"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 // Message types
@@ -27,7 +27,7 @@ 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"
 )
@@ -84,3 +84,24 @@ func MarshalAppend(buf []byte, c Codec, v interface{}, opts ...Option) ([]byte,
 
 	return append(buf, mbuf...), nil
 }
+
+// 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
+}

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/frame.go

@@ -5,29 +5,40 @@ type Frame struct {
 	Data []byte
 }
 
+// NewFrame returns new frame with data
+func NewFrame(data []byte) *Frame {
+	return &Frame{Data: data}
+}
+
+// MarshalJSON returns frame data
 func (m *Frame) MarshalJSON() ([]byte, error) {
-	return m.Data, nil
+	return m.Marshal()
 }
 
+// UnmarshalJSON set frame data
 func (m *Frame) UnmarshalJSON(data []byte) error {
-	m.Data = data
+	return m.Unmarshal(data)
-	return nil
 }
 
+// ProtoMessage noop func
 func (m *Frame) ProtoMessage() {}
 
+// Reset resets frame
 func (m *Frame) Reset() {
 	*m = Frame{}
 }
 
+// String returns frame as string
 func (m *Frame) String() string {
 	return string(m.Data)
 }
 
+// Marshal returns frame data
 func (m *Frame) Marshal() ([]byte, error) {
 	return m.Data, nil
 }
 
+// Unmarshal set frame data
 func (m *Frame) Unmarshal(data []byte) error {
 	m.Data = data
 	return nil

codec/frame.proto

@@ -1,4 +1,4 @@
-// Copyright 2021 Unistack LLC
+// Copyright 2021-2023 Unistack LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -17,7 +17,7 @@ syntax = "proto3";
 package micro.codec;
 
 option cc_enable_arenas = true;
-option go_package = "go.unistack.org/micro/v3/codec;codec";
+option go_package = "go.unistack.org/micro/v4/codec;codec";
 option java_multiple_files = true;
 option java_outer_classname = "MicroCodec";
 option java_package = "micro.codec";

codec/noop.go

@@ -106,6 +106,9 @@ 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

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

@@ -3,9 +3,9 @@ package codec
 import (
 	"context"
 
-	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v4/logger"
-	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v4/meter"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Option func

config/config.go

@@ -1,14 +1,19 @@
 // Package config is an interface for dynamic configuration.
-package config // import "go.unistack.org/micro/v3/config"
+package config // import "go.unistack.org/micro/v4/config"
 
 import (
 	"context"
 	"errors"
+	"reflect"
 	"time"
 )
 
+type Validator interface {
+	Validate() error
+}
+
 // DefaultConfig default config
-var DefaultConfig Config = NewConfig()
+var DefaultConfig = NewConfig()
 
 // DefaultWatcherMinInterval default min interval for poll changes
 var DefaultWatcherMinInterval = 5 * time.Second
@@ -23,6 +28,8 @@ var (
 	ErrInvalidStruct = errors.New("invalid struct specified")
 	// ErrWatcherStopped is returned when source watcher has been stopped
 	ErrWatcherStopped = errors.New("watcher stopped")
+	// ErrWatcherNotImplemented returned when config does not implement watch
+	ErrWatcherNotImplemented = errors.New("watcher not implemented")
 )
 
 // Config is an interface abstraction for dynamic configuration
@@ -65,33 +72,64 @@ 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)
 				if !c.Options().AllowFail {
@@ -101,11 +139,74 @@ 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.Errorf(ctx, "%s AfterLoad err: %v", 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.Errorf(ctx, "%s BeforeSave err: %v", 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.Errorf(ctx, "%s AfterSave err: %v", 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.Errorf(ctx, "%s BeforeInit err: %v", 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.Errorf(ctx, "%s AfterInit err: %v", c.String(), err)
 				if !c.Options().AllowFail {
 					return err
 				}

config/context.go

@@ -32,3 +32,33 @@ func SetOption(k, v interface{}) Option {
 		o.Context = context.WithValue(o.Context, k, v)
 	}
 }
+
+// SetSaveOption returns a function to setup a context with given value
+func SetSaveOption(k, v interface{}) SaveOption {
+	return func(o *SaveOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetLoadOption returns a function to setup a context with given value
+func SetLoadOption(k, v interface{}) LoadOption {
+	return func(o *LoadOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetWatchOption returns a function to setup a context with given value
+func SetWatchOption(k, v interface{}) WatchOption {
+	return func(o *WatchOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

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

@@ -2,13 +2,14 @@ package config
 
 import (
 	"context"
-	"fmt"
 	"reflect"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/imdario/mergo"
-	rutil "go.unistack.org/micro/v3/util/reflect"
+	rutil "go.unistack.org/micro/v4/util/reflect"
+	mtime "go.unistack.org/micro/v4/util/time"
 )
 
 type defaultConfig struct {
@@ -23,11 +24,20 @@ 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
+	}
+
+	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 {
+	if err := DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
@@ -50,21 +60,20 @@ 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)
+		return 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
 	}
 
@@ -76,6 +85,7 @@ func fillValue(value reflect.Value, val string) error {
 	if !rutil.IsEmpty(value) {
 		return nil
 	}
+
 	switch value.Kind() {
 	case reflect.Map:
 		t := value.Type()
@@ -152,11 +162,26 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(int32(v)))
 	case reflect.Int64:
-		v, err := strconv.ParseInt(val, 10, 64)
+		switch {
-		if err != nil {
+		case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "time":
-			return err
+			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/v4/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))
 		}
-		value.Set(reflect.ValueOf(v))
 	case reflect.Uint:
 		v, err := strconv.ParseUint(val, 10, 0)
 		if err != nil {
@@ -271,7 +296,7 @@ func (c *defaultConfig) Name() string {
 }
 
 func (c *defaultConfig) Watch(ctx context.Context, opts ...WatchOption) (Watcher, error) {
-	return nil, fmt.Errorf("not implemented")
+	return nil, ErrWatcherNotImplemented
 }
 
 // NewConfig returns new default config source

config/default_test.go

@@ -4,34 +4,55 @@ import (
 	"context"
 	"fmt"
 	"testing"
+	"time"
 
-	"go.unistack.org/micro/v3/config"
+	"go.unistack.org/micro/v4/config"
+	mtime "go.unistack.org/micro/v4/util/time"
 )
 
-type Cfg struct {
+type cfg struct {
+	StringValue    string `default:"string_value"`
+	IgnoreValue    string `json:"-"`
+	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"`
+}
+
+type cfgStructValue struct {
 	StringValue string `default:"string_value"`
-	IgnoreValue string `json:"-"`
+}
-	StructValue struct {
+
-		StringValue string `default:"string_value"`
+func (c *cfg) Validate() error {
+	if c.IntValue != 10 {
+		return fmt.Errorf("invalid IntValue %d != %d", 10, c.IntValue)
 	}
-	IntValue int `default:"99"`
+	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
 }
 
 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 +68,25 @@ 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)
+	}
 	_ = 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

@@ -4,10 +4,10 @@ import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/codec"
-	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v4/logger"
-	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v4/meter"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options hold the config options
@@ -28,14 +28,18 @@ 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
 }
@@ -66,8 +70,10 @@ type LoadOptions struct {
 	Struct   interface{}
 	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 {
@@ -102,7 +108,8 @@ type SaveOption func(o *SaveOptions)
 
 // SaveOptions struct
 type SaveOptions struct {
-	Struct interface{}
+	Struct  interface{}
+	Context context.Context
 }
 
 // SaveStruct override struct for save to config
@@ -128,6 +135,20 @@ 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) {
@@ -219,8 +240,10 @@ 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(),

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")
+	}
+}

errors/errors.go

@@ -1,11 +1,14 @@
 // 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 "go.unistack.org/micro/v4/errors"
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"strconv"
+	"strings"
 )
 
 var (
@@ -53,6 +56,22 @@ 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 +85,130 @@ 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),
 	}
 }
@@ -214,6 +233,27 @@ 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 verr, ok := err.(*Error); ok && verr != nil {
@@ -222,3 +262,81 @@ func FromError(err error) *Error {
 
 	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()
+}

errors/errors.proto

@@ -0,0 +1,31 @@
+// Copyright 2021-2023 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/v4/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 +1,34 @@
 package errors
 
 import (
+	"encoding/json"
 	er "errors"
+	"fmt"
 	"net/http"
 	"testing"
 )
 
+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 +96,19 @@ 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)
+	}
+}

event.go

@@ -1,27 +0,0 @@
-package micro
-
-import (
-	"context"
-
-	"go.unistack.org/micro/v3/client"
-)
-
-// Event is used to publish messages to a topic
-type Event interface {
-	// Publish publishes a message to the event topic
-	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
-}
-
-type event struct {
-	c     client.Client
-	topic string
-}
-
-// NewEvent creates a new event publisher
-func NewEvent(topic string, c client.Client) Event {
-	return &event{c, topic}
-}
-
-func (e *event) Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error {
-	return e.c.Publish(ctx, e.c.NewMessage(e.topic, msg), opts...)
-}

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

@@ -3,16 +3,15 @@ package flow
 import (
 	"context"
 	"fmt"
-	"path/filepath"
 	"sync"
 
 	"github.com/silas/dag"
-	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v4/client"
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/codec"
-	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v4/logger"
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
-	"go.unistack.org/micro/v3/store"
+	"go.unistack.org/micro/v4/store"
-	"go.unistack.org/micro/v3/util/id"
+	"go.unistack.org/micro/v4/util/id"
 )
 
 type microFlow struct {
@@ -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())})
 }
 
@@ -181,8 +180,8 @@ 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...)
 
@@ -219,7 +218,7 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 	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
 			}
 		}
@@ -246,32 +245,32 @@ 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)
 							}
-							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)
 							}
 							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)
 							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)
 							cherr <- werr
 							return
@@ -279,32 +278,32 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 					}(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)
 						}
-						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)
 						}
 						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)
 						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
 					}
@@ -349,6 +348,7 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 	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 "go.unistack.org/micro/v4/flow"
 
 import (
 	"context"
@@ -7,11 +7,13 @@ import (
 	"sync"
 	"sync/atomic"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 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

@@ -4,11 +4,11 @@ import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v4/client"
-	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v4/logger"
-	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v4/meter"
-	"go.unistack.org/micro/v3/store"
+	"go.unistack.org/micro/v4/store"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Option func
@@ -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 "go.unistack.org/micro/v4/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/v4/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.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 +1,19 @@
-module go.unistack.org/micro/v3
+module go.unistack.org/micro/v4
 
-go 1.16
+go 1.20
 
 require (
-	github.com/ef-ds/deque v1.0.4
+	github.com/DATA-DOG/go-sqlmock v1.5.0
-	github.com/golang-jwt/jwt/v4 v4.1.0
+	github.com/imdario/mergo v0.3.15
-	github.com/imdario/mergo v0.3.12
 	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
+	golang.org/x/sync v0.1.0
-	golang.org/x/net v0.0.0-20210928044308-7d9f5e0b762b
+	golang.org/x/sys v0.7.0
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	google.golang.org/grpc v1.54.0
+	google.golang.org/protobuf v1.30.0
+)
+
+require (
+	github.com/golang/protobuf v1.5.3 // indirect
+	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
 )

go.sum

@@ -1,31 +1,31 @@
-github.com/ef-ds/deque v1.0.4 h1:iFAZNmveMT9WERAkqLJ+oaABF9AcVQ5AjXem/hroniI=
+github.com/DATA-DOG/go-sqlmock v1.5.0 h1:Shsta01QNfFxHCfpW6YH2STWB0MudeXXEWMr20OEh60=
-github.com/ef-ds/deque v1.0.4/go.mod h1:gXDnTC3yqvBcHbq2lcExjtAcVrOnJCbMcZXmuj8Z4tg=
+github.com/DATA-DOG/go-sqlmock v1.5.0/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
-github.com/golang-jwt/jwt/v4 v4.1.0 h1:XUgk2Ex5veyVFVeLm0xhusUTQybEbexJXrvPNOKkSY0=
-github.com/golang-jwt/jwt/v4 v4.1.0/go.mod h1:/xlHOz8bRuivTWchD4jCa+NbatV+wEUSzwAxVc6locg=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/imdario/mergo v0.3.12 h1:b6R2BslTbIEToALKP7LxUvijTsNI9TAe80pLWN2g/HU=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
-github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
+github.com/imdario/mergo v0.3.15 h1:M8XP7IuFNsqUx6VPK2P9OSmsYsI/YFaGil0uD21V3dM=
+github.com/imdario/mergo v0.3.15/go.mod h1:WBLT9ZmE3lPoWsEzCh9LPo3TiwVN+ZKEjmz+hD27ysY=
 github.com/patrickmn/go-cache v2.1.0+incompatible h1:HRMgzkcYKYpi3C8ajMPV8OFXaaRUnok+kx1WdO15EQc=
 github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
-github.com/silas/dag v0.0.0-20210626123444-3804bac2d6d4 h1:fOH64AB0C3ixGf9emky61STvPJL3smxJg+1Zwx1oCdg=
+github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5 h1:G/FZtUu7a6NTWl3KUHMV9jkLAh/Rvtf03NWMHaEDl+E=
-github.com/silas/dag v0.0.0-20210626123444-3804bac2d6d4/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
+github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
-go.unistack.org/micro-proto/v3 v3.1.0 h1:q39FwjFiRZn+Ux/tt+d3bJTmDtsQQWa+3SLYVo1vLfA=
+golang.org/x/net v0.8.0 h1:Zrh2ngAOFYneWTAIAPethzeaQLuHwhuBkuV6ZiRnUaQ=
-go.unistack.org/micro-proto/v3 v3.1.0/go.mod h1:DpRhYCBXlmSJ/AAXTmntvlh7kQkYU6eFvlmYAx4BQS8=
+golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
-golang.org/x/net v0.0.0-20210928044308-7d9f5e0b762b h1:eB48h3HiRycXNy8E0Gf5e0hv7YT6Kt14L/D73G1fuwo=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/net v0.0.0-20210928044308-7d9f5e0b762b/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.8.0 h1:57P1ETyNKtuIjB4SRd15iJxuhj8Gc416Y78H3qgMh68=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 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 v0.0.0-20230410155749-daa745c078e1 h1:KpwkzHKEF7B9Zxg18WzOa7djJ+Ha5DzthMyZYQfEn2A=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1/go.mod h1:nKE/iIaLqn2bQwXBg8f1g2Ylh6r5MN5CmZvuzZCgsCU=
+google.golang.org/grpc v1.54.0 h1:EhTqbhiYeixwWQtAEZAxmV9MGqcjEU2mFx52xCzNyag=
+google.golang.org/grpc v1.54.0/go.mod h1:PUSEXI6iWghWaB6lXM4knEgpJNu2qUcKfDtNci3EC2g=
 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 v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
+google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 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_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

@@ -12,10 +12,8 @@ import (
 )
 
 type defaultLogger struct {
-	enc      *json.Encoder
+	enc  *json.Encoder
-	logFunc  LogFunc
+	opts Options
-	logfFunc LogfFunc
-	opts     Options
 	sync.RWMutex
 }
 
@@ -27,10 +25,6 @@ func (l *defaultLogger) Init(opts ...Option) error {
 	}
 	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
 }
@@ -47,17 +41,10 @@ func (l *defaultLogger) Clone(opts ...Option) Logger {
 		o(&oldopts)
 	}
 
-	oldopts.Wrappers = newopts.Wrappers
 	l.Lock()
-	cl := &defaultLogger{opts: oldopts, logFunc: l.logFunc, logfFunc: l.logfFunc}
+	cl := &defaultLogger{opts: oldopts, enc: json.NewEncoder(l.opts.Out)}
 	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
 }
 
@@ -75,13 +62,17 @@ func (l *defaultLogger) Level(level Level) {
 }
 
 func (l *defaultLogger) Fields(fields ...interface{}) Logger {
+	l.RLock()
 	nl := &defaultLogger{opts: l.opts, enc: l.enc}
 	if len(fields) == 0 {
+		l.RUnlock()
 		return nl
 	} else if len(fields)%2 != 0 {
 		fields = fields[:len(fields)-1]
 	}
+	nl.opts.Fields = copyFields(l.opts.Fields)
 	nl.opts.Fields = append(nl.opts.Fields, fields...)
+	l.RUnlock()
 	return nl
 }
 
@@ -141,27 +132,27 @@ func (l *defaultLogger) Fatal(ctx context.Context, args ...interface{}) {
 }
 
 func (l *defaultLogger) Infof(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, InfoLevel, msg, args...)
+	l.Logf(ctx, InfoLevel, msg, args...)
 }
 
 func (l *defaultLogger) Errorf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, ErrorLevel, msg, args...)
+	l.Logf(ctx, ErrorLevel, msg, args...)
 }
 
 func (l *defaultLogger) Debugf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, DebugLevel, msg, args...)
+	l.Logf(ctx, DebugLevel, msg, args...)
 }
 
 func (l *defaultLogger) Warnf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, WarnLevel, msg, args...)
+	l.Logf(ctx, WarnLevel, msg, args...)
 }
 
 func (l *defaultLogger) Tracef(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, TraceLevel, msg, args...)
+	l.Logf(ctx, TraceLevel, msg, args...)
 }
 
 func (l *defaultLogger) Fatalf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, FatalLevel, msg, args...)
+	l.Logf(ctx, FatalLevel, msg, args...)
 	os.Exit(1)
 }
 
@@ -234,8 +225,6 @@ 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

@@ -1,5 +1,5 @@
 // Package logger provides a log interface
-package logger // import "go.unistack.org/micro/v3/logger"
+package logger // import "go.unistack.org/micro/v4/logger"
 
 import (
 	"context"
@@ -8,9 +8,9 @@ import (
 
 var (
 	// DefaultLogger variable
-	DefaultLogger Logger = NewLogger(WithLevel(ParseLevel(os.Getenv("MICRO_LOG_LEVEL"))))
+	DefaultLogger = NewLogger(WithLevel(ParseLevel(os.Getenv("MICRO_LOG_LEVEL"))))
 	// DefaultLevel used by logger
-	DefaultLevel Level = InfoLevel
+	DefaultLevel = InfoLevel
 	// DefaultCallerSkipCount used by logger
 	DefaultCallerSkipCount = 2
 )

logger/logger_test.go

@@ -7,6 +7,63 @@ import (
 	"testing"
 )
 
+func TestContext(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, ok := FromContext(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(WithLevel(TraceLevel), 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(WithLevel(TraceLevel), WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	nl := l.Fields("key", "val")
+
+	ctx = NewContext(ctx, nl)
+
+	l, ok = 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())
+	}
+}
+
 func TestClone(t *testing.T) {
 	ctx := context.TODO()
 	buf := bytes.NewBuffer(nil)
@@ -79,39 +136,3 @@ func TestLogger(t *testing.T) {
 		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/options.go

@@ -19,8 +19,6 @@ type Options struct {
 	Fields []interface{}
 	// Name holds the logger name
 	Name string
-	// Wrappers logger wrapper that called before actual Log/Logf function
-	Wrappers []Wrapper
 	// The logging level the logger should log
 	Level Level
 	// CallerSkipCount number of frmaes to skip
@@ -83,10 +81,3 @@ func WithName(n string) Option {
 		o.Name = n
 	}
 }
-
-// WrapLogger adds a logger Wrapper to a list of options passed into the logger
-func WrapLogger(w Wrapper) Option {
-	return func(o *Options) {
-		o.Wrappers = append(o.Wrappers, w)
-	}
-}

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/v4/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
+	}
+}

logger/unwrap/unwrap_test.go

@@ -0,0 +1,100 @@
+package unwrap
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"go.unistack.org/micro/v4/codec"
+)
+
+func TestUnwrap(t *testing.T) {
+	string1 := "string1"
+	string2 := "string2"
+
+	type val1 struct {
+		mp  map[string]string
+		val *val1
+		str *string
+		ar  []*string
+	}
+
+	v1 := &val1{ar: []*string{&string1, &string2}, str: &string1, val: &val1{str: &string2}, mp: map[string]string{"key": "val"}}
+
+	buf := fmt.Sprintf("%#v", Unwrap(v1))
+	if strings.Compare(buf, `&unwrap.val1{mp:map[string]string{"key":"val"}, val:(*unwrap.val1){mp:map[string]string<nil>, val:(*unwrap.val1)<nil>, str:(*string)"string2", ar:[]*string<nil>}, str:(*string)"string1", ar:[]*string{<*><shown>, <*>"string2"}}`) != 0 {
+		t.Fatalf("not proper written %s", buf)
+	}
+
+	type val2 struct {
+		mp  map[string]string
+		val *val2
+		str string
+		ar  []string
+	}
+
+	v2 := &val2{ar: []string{string1, string2}, str: string1, val: &val2{str: string2}, mp: map[string]string{"key": "val"}}
+	_ = v2
+	// t.Logf("output: %#v", v2)
+}
+
+func TestCodec(t *testing.T) {
+	type val struct {
+		MP  map[string]string `json:"mp"`
+		STR string            `json:"str"`
+		AR  []string          `json:"ar"`
+	}
+
+	v1 := &val{AR: []string{"string1", "string2"}, STR: "string", MP: map[string]string{"key": "val"}}
+
+	buf := fmt.Sprintf("%#v", Unwrap(v1, Codec(codec.NewCodec())))
+	if strings.Compare(buf, `{"mp":{"key":"val"},"str":"string","ar":["string1","string2"]}`) != 0 {
+		t.Fatalf("not proper written %s", buf)
+	}
+}
+
+func TestOmit(t *testing.T) {
+	type val struct {
+		Key1 string `logger:"omit"`
+		Key2 string `logger:"take"`
+		Key3 string
+	}
+	v1 := &val{Key1: "val1", Key2: "val2", Key3: "val3"}
+	buf := fmt.Sprintf("%#v", Unwrap(v1))
+	if strings.Compare(buf, `&unwrap.val{Key2:"val2", Key3:"val3"}`) != 0 {
+		t.Fatalf("not proper written %s", buf)
+	}
+}
+
+func TestTagged(t *testing.T) {
+	type val struct {
+		Key1 string `logger:"take"`
+		Key2 string
+	}
+
+	v1 := &val{Key1: "val1", Key2: "val2"}
+	buf := fmt.Sprintf("%#v", Unwrap(v1, Tagged(true)))
+	if strings.Compare(buf, `&unwrap.val{Key1:"val1"}`) != 0 {
+		t.Fatalf("not proper written %s", buf)
+	}
+}
+
+func TestTaggedNested(t *testing.T) {
+	type val struct {
+		key string `logger:"take"`
+		val string `logger:"omit"`
+		unk string
+	}
+	type str struct {
+		key string `logger:"omit"`
+		val *val   `logger:"take"`
+	}
+
+	var iface interface{}
+	v := &str{val: &val{key: "test", unk: "unk"}}
+	iface = v
+	buf := fmt.Sprintf("%#v", Unwrap(iface, Tagged(true)))
+	if strings.Compare(buf, `&unwrap.str{val:(*unwrap.val){key:"test"}}`) != 0 {
+		t.Fatalf("not proper written %s", buf)
+	}
+}

logger/wrapper.go

@@ -1,166 +0,0 @@
-package logger // import "go.unistack.org/micro/v3/logger/wrapper"
-
-import (
-	"context"
-	"reflect"
-
-	rutil "go.unistack.org/micro/v3/util/reflect"
-)
-
-// LogFunc function used for Log method
-type LogFunc func(ctx context.Context, level Level, args ...interface{})
-
-// LogfFunc function used for Logf method
-type LogfFunc func(ctx context.Context, level Level, msg string, args ...interface{})
-
-type Wrapper interface {
-	// Log logs message with needed level
-	Log(LogFunc) LogFunc
-	// Logf logs message with needed level
-	Logf(LogfFunc) LogfFunc
-}
-
-var _ Logger = &OmitLogger{}
-
-type OmitLogger struct {
-	l Logger
-}
-
-func NewOmitLogger(l Logger) Logger {
-	return &OmitLogger{l: l}
-}
-
-func (w *OmitLogger) Init(opts ...Option) error {
-	return w.l.Init(append(opts, WrapLogger(NewOmitWrapper()))...)
-}
-
-func (w *OmitLogger) V(level Level) bool {
-	return w.l.V(level)
-}
-
-func (w *OmitLogger) Level(level Level) {
-	w.l.Level(level)
-}
-
-func (w *OmitLogger) Clone(opts ...Option) Logger {
-	return w.l.Clone(opts...)
-}
-
-func (w *OmitLogger) Options() Options {
-	return w.l.Options()
-}
-
-func (w *OmitLogger) Fields(fields ...interface{}) Logger {
-	return w.l.Fields(fields...)
-}
-
-func (w *OmitLogger) Info(ctx context.Context, args ...interface{}) {
-	w.l.Info(ctx, args...)
-}
-
-func (w *OmitLogger) Trace(ctx context.Context, args ...interface{}) {
-	w.l.Trace(ctx, args...)
-}
-
-func (w *OmitLogger) Debug(ctx context.Context, args ...interface{}) {
-	w.l.Debug(ctx, args...)
-}
-
-func (w *OmitLogger) Warn(ctx context.Context, args ...interface{}) {
-	w.l.Warn(ctx, args...)
-}
-
-func (w *OmitLogger) Error(ctx context.Context, args ...interface{}) {
-	w.l.Error(ctx, args...)
-}
-
-func (w *OmitLogger) Fatal(ctx context.Context, args ...interface{}) {
-	w.l.Fatal(ctx, args...)
-}
-
-func (w *OmitLogger) Infof(ctx context.Context, msg string, args ...interface{}) {
-	w.l.Infof(ctx, msg, args...)
-}
-
-func (w *OmitLogger) Tracef(ctx context.Context, msg string, args ...interface{}) {
-	w.l.Tracef(ctx, msg, args...)
-}
-
-func (w *OmitLogger) Debugf(ctx context.Context, msg string, args ...interface{}) {
-	w.l.Debugf(ctx, msg, args...)
-}
-
-func (w *OmitLogger) Warnf(ctx context.Context, msg string, args ...interface{}) {
-	w.l.Warnf(ctx, msg, args...)
-}
-
-func (w *OmitLogger) Errorf(ctx context.Context, msg string, args ...interface{}) {
-	w.l.Errorf(ctx, msg, args...)
-}
-
-func (w *OmitLogger) Fatalf(ctx context.Context, msg string, args ...interface{}) {
-	w.l.Fatalf(ctx, msg, args...)
-}
-
-func (w *OmitLogger) Log(ctx context.Context, level Level, args ...interface{}) {
-	w.l.Log(ctx, level, args...)
-}
-
-func (w *OmitLogger) Logf(ctx context.Context, level Level, msg string, args ...interface{}) {
-	w.l.Logf(ctx, level, msg, args...)
-}
-
-func (w *OmitLogger) String() string {
-	return w.l.String()
-}
-
-type OmitWrapper struct{}
-
-func NewOmitWrapper() Wrapper {
-	return &OmitWrapper{}
-}
-
-func getArgs(args []interface{}) []interface{} {
-	nargs := make([]interface{}, 0, len(args))
-	var err error
-	for _, arg := range args {
-		val := reflect.ValueOf(arg)
-		if val.Kind() == reflect.Ptr {
-			val = val.Elem()
-		}
-		narg := arg
-		if val.Kind() != reflect.Struct {
-			nargs = append(nargs, narg)
-			continue
-		}
-
-		if narg, err = rutil.Zero(arg); err != nil {
-			nargs = append(nargs, narg)
-			continue
-		}
-
-		rutil.CopyDefaults(narg, arg)
-		if flds, ferr := rutil.StructFields(narg); ferr == nil {
-			for _, fld := range flds {
-				if tv, ok := fld.Field.Tag.Lookup("logger"); ok && tv == "omit" {
-					fld.Value.Set(reflect.Zero(fld.Value.Type()))
-				}
-			}
-		}
-
-		nargs = append(nargs, narg)
-	}
-	return nargs
-}
-
-func (w *OmitWrapper) Log(fn LogFunc) LogFunc {
-	return func(ctx context.Context, level Level, args ...interface{}) {
-		fn(ctx, level, getArgs(args)...)
-	}
-}
-
-func (w *OmitWrapper) Logf(fn LogfFunc) LogfFunc {
-	return func(ctx context.Context, level Level, msg string, args ...interface{}) {
-		fn(ctx, level, msg, getArgs(args)...)
-	}
-}