Merge pull request #153 from unistack-org/client_metadata

client: add req/rsp metadata to CallOptions

.github/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@v2
+        if: github.actor == 'vtolstov' || github.actor == 'dependabot[bot]'
+        id: approve
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/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/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
-      uses: actions/checkout@v2
-    - name: sdk deps
+    - name: 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@v3.3.1
         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/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/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
-      uses: actions/checkout@v2
-
+    - name: checkout
+      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
-      uses: github/codeql-action/init@v1
+    - name: init
+      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
-      uses: github/codeql-action/autobuild@v1
+    - name: autobuild
+      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
-      uses: github/codeql-action/analyze@v1
+    - name: analyze
+      uses: github/codeql-action/analyze@v2

.github/workflows/dependabot-automerge.yml

@@ -1,66 +1,27 @@
-name: "prautomerge"
+name: "dependabot-automerge"
 
 on:
-  workflow_run:
-    workflows: ["prbuild"]
-    types:
-      - completed
+  pull_request_target:
+    types: [assigned, opened, synchronize, reopened]
 
 permissions:
-  contents: write
   pull-requests: write
+  contents: write
 
 jobs:
-  Dependabot-Automerge:
+  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 ))
+    if: github.actor == 'dependabot[bot]'
     steps:
-      - name: Approve Changes and Merge changes if label 'dependencies' is set
-        uses: actions/github-script@v5
+      - name: metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1.3.5
         with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            console.log(context.payload.workflow_run);
-            
-            var labelNames = await github.paginate(
-              github.issues.listLabelsOnIssue,
-              {
-                repo: context.repo.repo,
-                owner: context.repo.owner,
-                issue_number: context.payload.workflow_run.pull_requests[0].number,
-              },
-              (response) => response.data.map(
-                (label) => label.name
-              )
-            );
-
-            console.log(labelNames);
-
-            if (labelNames.includes('dependencies')) {
-              console.log('Found label');
-
-              await github.pulls.createReview({
-                repo: context.repo.repo,
-                owner: context.repo.owner,
-                pull_number: context.payload.workflow_run.pull_requests[0].number,
-                event: 'APPROVE'
-              });
-              console.log('Approved PR');
-
-              await github.pulls.merge({
-                repo: context.repo.repo,
-                owner: context.repo.owner,
-                pull_number: context.payload.workflow_run.pull_requests[0].number,
-              });
-
-              console.log('Merged PR');
-            }
+          github-token: "${{ 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/workflows/pr.yml

@@ -3,57 +3,42 @@ on:
   pull_request:
     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
+        path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
         restore-keys: ${{ runner.os }}-go-
-    - name: sdk checkout
-      uses: actions/checkout@v2
-    - name: sdk deps
+    - name: 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@v3.3.1
         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.

README.md

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

api/api_test.go

@@ -3,10 +3,27 @@ package api
 import (
 	"strings"
 	"testing"
+
+	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v3/server"
 )
 
+func TestDecode(t *testing.T) {
+	md := metadata.New(0)
+	md.Set("host", "localhost", "method", "GET", "path", "/")
+	ep := Decode(md)
+	if md == nil {
+		t.Fatalf("failed to decode md %#+v", md)
+	} else if len(ep.Host) != 1 || len(ep.Method) != 1 || len(ep.Path) != 1 {
+		t.Fatalf("ep invalid after decode %#+v", ep)
+	}
+	if ep.Host[0] != "localhost" || ep.Method[0] != "GET" || ep.Path[0] != "/" {
+		t.Fatalf("ep invalid after decode %#+v", ep)
+	}
+}
+
 //nolint:gocyclo
-func TestEncoding(t *testing.T) {
+func TestEncode(t *testing.T) {
 	testData := []*Endpoint{
 		nil,
 		{
@@ -150,3 +167,79 @@ func TestValidate(t *testing.T) {
 		t.Fatalf("invalid pcre %v", epPcreInvalid.Path[0])
 	}
 }
+
+func TestWithEndpoint(t *testing.T) {
+	ep := &Endpoint{
+		Name:        "Foo.Bar",
+		Description: "A test endpoint",
+		Handler:     "meta",
+		Host:        []string{"foo.com"},
+		Method:      []string{"GET"},
+		Path:        []string{"/test/{id}"},
+	}
+	o := WithEndpoint(ep)
+	opts := server.NewHandlerOptions(o)
+	if opts.Metadata == nil {
+		t.Fatalf("WithEndpoint not works %#+v", opts)
+	}
+	md, ok := opts.Metadata[ep.Name]
+	if !ok {
+		t.Fatalf("WithEndpoint not works %#+v", opts)
+	}
+	if v, ok := md.Get("Endpoint"); !ok || v != "Foo.Bar" {
+		t.Fatalf("WithEndpoint not works %#+v", md)
+	}
+}
+
+func TestValidateNilErr(t *testing.T) {
+	var ep *Endpoint
+	if err := Validate(ep); err == nil {
+		t.Fatalf("Validate not works")
+	}
+}
+
+func TestValidateMissingNameErr(t *testing.T) {
+	ep := &Endpoint{}
+	if err := Validate(ep); err == nil {
+		t.Fatalf("Validate not works")
+	}
+}
+
+func TestValidateMissingHandlerErr(t *testing.T) {
+	ep := &Endpoint{Name: "test"}
+	if err := Validate(ep); err == nil {
+		t.Fatalf("Validate not works")
+	}
+}
+
+func TestValidateRegexpStartErr(t *testing.T) {
+	ep := &Endpoint{Name: "test", Handler: "test"}
+	ep.Path = []string{"^/"}
+	if err := Validate(ep); err == nil {
+		t.Fatalf("Validate not works")
+	}
+}
+
+func TestValidateRegexpEndErr(t *testing.T) {
+	ep := &Endpoint{Name: "test", Handler: "test", Path: []string{""}}
+	ep.Path[0] = "/$"
+	if err := Validate(ep); err == nil {
+		t.Fatalf("Validate not works")
+	}
+}
+
+func TestValidateRegexpNonErr(t *testing.T) {
+	ep := &Endpoint{Name: "test", Handler: "test", Path: []string{""}}
+	ep.Path[0] = "^/(.*)$"
+	if err := Validate(ep); err != nil {
+		t.Fatalf("Validate not works")
+	}
+}
+
+func TestValidateRegexpErr(t *testing.T) {
+	ep := &Endpoint{Name: "test", Handler: "test", Path: []string{""}}
+	ep.Path[0] = "^/(.$"
+	if err := Validate(ep); err == nil {
+		t.Fatalf("Validate not works")
+	}
+}

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

@@ -9,7 +9,7 @@ import (
 )
 
 // DefaultBroker default memory broker
-var DefaultBroker Broker = NewBroker()
+var DefaultBroker = NewBroker()
 
 var (
 	// ErrNotConnected returns when broker used but not connected yet
@@ -50,6 +50,7 @@ type Handler func(Event) error
 // Events contains multiple events
 type Events []Event
 
+// Ack try to ack all events and return
 func (evs Events) Ack() error {
 	var err error
 	for _, ev := range evs {
@@ -60,6 +61,7 @@ func (evs Events) Ack() error {
 	return nil
 }
 
+// SetError sets error on event
 func (evs Events) SetError(err error) {
 	for _, ev := range evs {
 		ev.SetError(err)

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")
+	}
+}

build/build.go

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

build/options.go

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

client/backoff.go

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

client/backoff_test.go

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

client/client.go

@@ -11,11 +11,11 @@ import (
 
 var (
 	// DefaultClient is the global default client
-	DefaultClient Client = NewClient()
+	DefaultClient = NewClient()
 	// DefaultContentType is the default content-type if not specified
 	DefaultContentType = "application/json"
-	// DefaultBackoff is the default backoff function for retries
-	DefaultBackoff = exponentialBackoff
+	// DefaultBackoff is the default backoff function for retries (minimum 10 millisecond and maximum 5 second)
+	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
@@ -49,6 +49,7 @@ type Message interface {
 	Topic() string
 	Payload() interface{}
 	ContentType() string
+	Metadata() metadata.Metadata
 }
 
 // Request is the interface for a synchronous request used by Call or Stream
@@ -91,10 +92,16 @@ 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

@@ -12,7 +12,7 @@ import (
 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 +2,14 @@ package client
 
 import (
 	"context"
+	"fmt"
+	"time"
 
 	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/errors"
 	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v3/selector"
 )
 
 // DefaultCodecs will be used to encode/decode data
@@ -119,6 +122,14 @@ 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 +138,10 @@ func (n *noopStream) Close() error {
 	return nil
 }
 
+func (n *noopStream) CloseSend() error {
+	return nil
+}
+
 func (n *noopMessage) Topic() string {
 	return n.topic
 }
@@ -139,6 +154,10 @@ 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 +184,138 @@ 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
+
+	for i := 0; i <= callOpts.Retries; i++ {
+		go func() {
+			ch <- call(i)
+		}()
+
+		select {
+		case <-ctx.Done():
+			return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+		case err := <-ch:
+			// if the call succeeded lets bail early
+			if err == nil {
+				return nil
+			}
+
+			retry, rerr := callOpts.Retry(ctx, req, i, err)
+			if rerr != nil {
+				return rerr
+			}
+
+			if !retry {
+				return err
+			}
+
+			gerr = err
+		}
+	}
+
+	return gerr
+}
+
+func (n *noopClient) call(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error {
 	return nil
 }
 
@@ -178,6 +329,146 @@ func (n *noopClient) NewMessage(topic string, msg interface{}, opts ...MessageOp
 }
 
 func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
+	var err error
+
+	// make a copy of call opts
+	callOpts := n.opts.CallOptions
+	for _, o := range opts {
+		o(&callOpts)
+	}
+
+	// check if we already have a deadline
+	d, ok := ctx.Deadline()
+	if !ok && callOpts.StreamTimeout > time.Duration(0) {
+		var cancel context.CancelFunc
+		// no deadline so we create a new one
+		ctx, cancel = context.WithTimeout(ctx, callOpts.StreamTimeout)
+		defer cancel()
+	} else {
+		// got a deadline so no need to setup context
+		// but we need to set the timeout we pass along
+		o := WithStreamTimeout(time.Until(d))
+		o(&callOpts)
+	}
+
+	// should we noop right here?
+	select {
+	case <-ctx.Done():
+		return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+	default:
+	}
+
+	/*
+		// make copy of call method
+		hstream := h.stream
+		// wrap the call in reverse
+		for i := len(callOpts.CallWrappers); i > 0; i-- {
+			hstream = callOpts.CallWrappers[i-1](hstream)
+		}
+	*/
+
+	// use the router passed as a call option, or fallback to the rpc clients router
+	if callOpts.Router == nil {
+		callOpts.Router = n.opts.Router
+	}
+
+	if callOpts.Selector == nil {
+		callOpts.Selector = n.opts.Selector
+	}
+
+	// inject proxy address
+	// TODO: don't even bother using Lookup/Select in this case
+	if len(n.opts.Proxy) > 0 {
+		callOpts.Address = []string{n.opts.Proxy}
+	}
+
+	var next selector.Next
+
+	call := func(i int) (Stream, error) {
+		// call backoff first. Someone may want an initial start delay
+		t, cerr := callOpts.Backoff(ctx, req, i)
+		if cerr != nil {
+			return nil, errors.InternalServerError("go.micro.client", cerr.Error())
+		}
+
+		// only sleep if greater than 0
+		if t.Seconds() > 0 {
+			time.Sleep(t)
+		}
+
+		if next == nil {
+			var routes []string
+			// lookup the route to send the reques to
+			// TODO apply any filtering here
+			routes, err = n.opts.Lookup(ctx, req, callOpts)
+			if err != nil {
+				return nil, errors.InternalServerError("go.micro.client", err.Error())
+			}
+
+			// balance the list of nodes
+			next, err = callOpts.Selector.Select(routes)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		node := next()
+
+		stream, cerr := n.stream(ctx, node, req, callOpts)
+
+		// record the result of the call to inform future routing decisions
+		if verr := n.opts.Selector.Record(node, cerr); verr != nil {
+			return nil, verr
+		}
+
+		// try and transform the error to a go-micro error
+		if verr, ok := cerr.(*errors.Error); ok {
+			return nil, verr
+		}
+
+		return stream, cerr
+	}
+
+	type response struct {
+		stream Stream
+		err    error
+	}
+
+	ch := make(chan response, callOpts.Retries)
+	var grr error
+
+	for i := 0; i <= callOpts.Retries; i++ {
+		go func() {
+			s, cerr := call(i)
+			ch <- response{s, cerr}
+		}()
+
+		select {
+		case <-ctx.Done():
+			return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
+		case rsp := <-ch:
+			// if the call succeeded lets bail early
+			if rsp.err == nil {
+				return rsp.stream, nil
+			}
+
+			retry, rerr := callOpts.Retry(ctx, req, i, err)
+			if rerr != nil {
+				return nil, rerr
+			}
+
+			if !retry {
+				return nil, rsp.err
+			}
+
+			grr = rsp.err
+		}
+	}
+
+	return nil, grr
+}
+
+func (n *noopClient) stream(ctx context.Context, addr string, req Request, opts CallOptions) (Stream, error) {
 	return &noopStream{}, nil
 }
 

client/options.go

@@ -3,11 +3,13 @@ package client
 import (
 	"context"
 	"crypto/tls"
+	"net"
 	"time"
 
 	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v3/metadata"
 	"go.unistack.org/micro/v3/meter"
 	"go.unistack.org/micro/v3/network/transport"
 	"go.unistack.org/micro/v3/register"
@@ -55,6 +57,8 @@ 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 +98,23 @@ 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 +145,7 @@ 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 +154,10 @@ 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
 }
 
@@ -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

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

client/retry_test.go

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

codec/codec.go

@@ -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"
 )

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 nil
+	return m.Unmarshal(data)
 }
 
+// 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

@@ -17,7 +17,7 @@ syntax = "proto3";
 package micro.codec;
 
 option cc_enable_arenas = true;
-option go_package = "github.com/unistack-org/micro/v3/codec;codec";
+option go_package = "go.unistack.org/micro/v3/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

config/config.go

@@ -4,11 +4,16 @@ package config // import "go.unistack.org/micro/v3/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
@@ -65,7 +72,59 @@ 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 default func that runs after config load
 	DefaultAfterLoad = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().AfterLoad {
 			if err := fn(ctx, c); err != nil {
@@ -77,7 +136,7 @@ var (
 		}
 		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 err := fn(ctx, c); err != nil {
@@ -89,7 +148,7 @@ var (
 		}
 		return nil
 	}
-
+	// DefaultBeforeLoad default func that runs before config load
 	DefaultBeforeLoad = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().BeforeLoad {
 			if err := fn(ctx, c); err != nil {
@@ -101,11 +160,11 @@ var (
 		}
 		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 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
 				}

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

@@ -2,7 +2,6 @@ package config
 
 import (
 	"context"
-	"fmt"
 	"reflect"
 	"strconv"
 	"strings"
@@ -271,7 +270,7 @@ 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

@@ -8,30 +8,46 @@ import (
 	"go.unistack.org/micro/v3/config"
 )
 
-type Cfg struct {
+type cfg struct {
 	StringValue string `default:"string_value"`
 	IgnoreValue string `json:"-"`
-	StructValue struct {
-		StringValue string `default:"string_value"`
+	StructValue *cfgStructValue
+	IntValue    int `default:"99"`
+}
+
+type cfgStructValue 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}
-	blfn := func(ctx context.Context, cfg config.Config) error {
-		nconf, ok := cfg.Options().Struct.(*Cfg)
+	conf := &cfg{IntValue: 10}
+	blfn := func(_ context.Context, c config.Config) error {
+		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 {
-		nconf, ok := cfg.Options().Struct.(*Cfg)
+	alfn := func(_ context.Context, c config.Config) error {
+		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
@@ -50,3 +66,19 @@ func TestDefault(t *testing.T) {
 	_ = 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

@@ -66,8 +66,10 @@ 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 +104,8 @@ type SaveOption func(o *SaveOptions)
 
 // SaveOptions struct
 type SaveOptions struct {
-	Struct interface{}
+	Struct  interface{}
+	Context context.Context
 }
 
 // SaveStruct override struct for save to config
@@ -219,8 +222,10 @@ 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

@@ -3,9 +3,12 @@
 package errors // import "go.unistack.org/micro/v3/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)
-	errr := json.Unmarshal([]byte(err), e)
-	if errr != nil {
+	e := &Error{}
+	nerr := json.Unmarshal([]byte(err), e)
+	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 Unistack LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package micro.errors;
+
+option cc_enable_arenas = true;
+option go_package = "go.unistack.org/micro/v3/errors;errors";
+option java_multiple_files = true;
+option java_outer_classname = "MicroErrors";
+option java_package = "micro.errors";
+option objc_class_prefix = "MERRORS";
+
+message Error {
+  string id = 1;
+  string detail = 2;
+  string status = 3;
+  uint32 code = 4;
+}

errors/errors_test.go

@@ -1,11 +1,34 @@
 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)
+	}
+}

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 +7,55 @@ import (
 	"github.com/silas/dag"
 )
 
+func TestDeps(t *testing.T) {
+	d := &dag.AcyclicGraph{}
+
+	v0 := d.Add(&node{"v0"})
+	v1 := d.Add(&node{"v1"})
+	v2 := d.Add(&node{"v2"})
+	v3 := d.Add(&node{"v3"})
+	v4 := d.Add(&node{"v4"})
+
+	d.Connect(dag.BasicEdge(v0, v1))
+	d.Connect(dag.BasicEdge(v1, v2))
+	d.Connect(dag.BasicEdge(v2, v4))
+	d.Connect(dag.BasicEdge(v0, v3))
+	d.Connect(dag.BasicEdge(v3, v4))
+
+	if err := d.Validate(); err != nil {
+		t.Fatal(err)
+	}
+
+	d.TransitiveReduction()
+
+	var steps [][]string
+	fn := func(n dag.Vertex, idx int) error {
+		if idx == 0 {
+			steps = make([][]string, 1)
+			steps[0] = make([]string, 0, 1)
+		} else if idx >= len(steps) {
+			tsteps := make([][]string, idx+1)
+			copy(tsteps, steps)
+			steps = tsteps
+			steps[idx] = make([]string, 0, 1)
+		}
+		steps[idx] = append(steps[idx], fmt.Sprintf("%s", n))
+		return nil
+	}
+
+	start := &node{"v0"}
+	err := d.SortedDepthFirstWalk([]dag.Vertex{start}, fn)
+	checkErr(t, err)
+
+	for idx, steps := range steps {
+		fmt.Printf("level %d steps %#+v\n", idx, steps)
+	}
+
+	if len(steps[2]) != 1 {
+		t.Logf("invalid steps %#+v", steps[2])
+	}
+}
+
 func checkErr(t *testing.T, err error) {
 	if err != nil {
 		t.Fatal(err)

flow/default.go

@@ -3,7 +3,6 @@ package flow
 import (
 	"context"
 	"fmt"
-	"path/filepath"
 	"sync"
 
 	"github.com/silas/dag"
@@ -150,17 +149,17 @@ func (w *microWorkflow) getSteps(start string, reverse bool) ([][]Step, error) {
 }
 
 func (w *microWorkflow) Abort(ctx context.Context, id string) error {
-	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
+	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+id)
 	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusAborted.String())})
 }
 
 func (w *microWorkflow) Suspend(ctx context.Context, id string) error {
-	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
+	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+id)
 	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusSuspend.String())})
 }
 
 func (w *microWorkflow) Resume(ctx context.Context, id string) error {
-	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", id))
+	workflowStore := store.NewNamespaceStore(w.opts.Store, "workflows"+w.opts.Store.Options().Separator+id)
 	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusRunning.String())})
 }
 
@@ -181,8 +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))
-	workflowStore := store.NewNamespaceStore(w.opts.Store, filepath.Join("workflows", eid))
+	stepStore := store.NewNamespaceStore(w.opts.Store, "steps"+w.opts.Store.Options().Separator+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

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

flow/options.go

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

fsm/fsm.go

@@ -0,0 +1,181 @@
+package fsm // import "go.unistack.org/micro/v3/fsm"
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+)
+
+var (
+	ErrInvalidState = errors.New("does not exists")
+	StateEnd        = "end"
+)
+
+// Options struct holding fsm options
+type Options struct {
+	// DryRun mode
+	DryRun bool
+	// Initial state
+	Initial string
+	// HooksBefore func slice runs in order before state
+	HooksBefore []HookBeforeFunc
+	// HooksAfter func slice runs in order after state
+	HooksAfter []HookAfterFunc
+}
+
+// HookBeforeFunc func signature
+type HookBeforeFunc func(ctx context.Context, state string, args interface{})
+
+// HookAfterFunc func signature
+type HookAfterFunc func(ctx context.Context, state string, args interface{})
+
+// 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
+	}
+}
+
+// HookBefore provides hook func slice
+func HookBefore(fns ...HookBeforeFunc) Option {
+	return func(o *Options) {
+		o.HooksBefore = fns
+	}
+}
+
+// HookAfter provides hook func slice
+func HookAfter(fns ...HookAfterFunc) Option {
+	return func(o *Options) {
+		o.HooksAfter = fns
+	}
+}
+
+// StateFunc called on state transition and return next step and error
+type StateFunc func(ctx context.Context, args interface{}, opts ...StateOption) (string, interface{}, error)
+
+// FSM is a finite state machine
+type FSM struct {
+	mu          sync.Mutex
+	statesMap   map[string]StateFunc
+	statesOrder []string
+	opts        *Options
+	current     string
+}
+
+// New creates a new finite state machine having the specified initial state
+// with specified options
+func New(opts ...Option) *FSM {
+	options := &Options{}
+
+	for _, opt := range opts {
+		opt(options)
+	}
+
+	return &FSM{
+		statesMap: map[string]StateFunc{},
+		opts:      options,
+	}
+}
+
+// Current returns the current state
+func (f *FSM) Current() string {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	return f.current
+}
+
+// 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()
+}
+
+// Init initialize fsm and check states
+
+// Start runs state machine with provided data
+func (f *FSM) Start(ctx context.Context, args interface{}, opts ...Option) (interface{}, error) {
+	var err error
+	var ok bool
+	var fn StateFunc
+	var nstate string
+
+	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()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		default:
+			fn, ok = states[cstate]
+			if !ok {
+				return nil, fmt.Errorf(`state "%s" %w`, cstate, ErrInvalidState)
+			}
+			f.mu.Lock()
+			f.current = cstate
+			f.mu.Unlock()
+			for _, fn := range options.HooksBefore {
+				fn(ctx, cstate, args)
+			}
+			nstate, args, err = fn(ctx, args, sopts...)
+			for _, fn := range options.HooksAfter {
+				fn(ctx, cstate, args)
+			}
+			switch {
+			case err != nil:
+				return args, err
+			case nstate == StateEnd:
+				return args, nil
+			case nstate == "":
+				for idx := range f.statesOrder {
+					if f.statesOrder[idx] == cstate && len(f.statesOrder) > idx+1 {
+						nstate = f.statesOrder[idx+1]
+					}
+				}
+			}
+			cstate = nstate
+		}
+	}
+}

fsm/fsm_test.go

@@ -0,0 +1,63 @@
+package fsm
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"testing"
+)
+
+func TestFSMStart(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	pfb := func(_ context.Context, state string, _ interface{}) {
+		fmt.Fprintf(buf, "before state %s\n", state)
+	}
+	pfa := func(_ context.Context, state string, _ interface{}) {
+		fmt.Fprintf(buf, "after state %s\n", state)
+	}
+	f := New(InitialState("1"), HookBefore(pfb), HookAfter(pfa))
+	f1 := func(_ context.Context, req interface{}, _ ...StateOption) (string, interface{}, error) {
+		args := req.(map[string]interface{})
+		if v, ok := args["request"].(string); !ok || v == "" {
+			return "", nil, fmt.Errorf("empty request")
+		}
+		return "2", map[string]interface{}{"response": "test2"}, nil
+	}
+	f2 := func(_ context.Context, req interface{}, _ ...StateOption) (string, interface{}, error) {
+		args := req.(map[string]interface{})
+		if v, ok := args["response"].(string); !ok || v == "" {
+			return "", nil, fmt.Errorf("empty response")
+		}
+		return "", map[string]interface{}{"response": "test"}, nil
+	}
+	f3 := func(_ context.Context, req interface{}, _ ...StateOption) (string, interface{}, error) {
+		args := req.(map[string]interface{})
+		if v, ok := args["response"].(string); !ok || v == "" {
+			return "", nil, fmt.Errorf("empty response")
+		}
+		return StateEnd, map[string]interface{}{"response": "test_last"}, nil
+	}
+	f.State("1", f1)
+	f.State("2", f2)
+	f.State("3", f3)
+	rsp, err := f.Start(ctx, map[string]interface{}{"request": "test1"})
+	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 != "test_last" {
+		t.Fatalf("invalid rsp %#+v", args)
+	}
+
+	if !bytes.Contains(buf.Bytes(), []byte(`before state 1`)) ||
+		!bytes.Contains(buf.Bytes(), []byte(`before state 2`)) ||
+		!bytes.Contains(buf.Bytes(), []byte(`after state 1`)) ||
+		!bytes.Contains(buf.Bytes(), []byte(`after state 2`)) ||
+		!bytes.Contains(buf.Bytes(), []byte(`after state 3`)) ||
+		!bytes.Contains(buf.Bytes(), []byte(`after state 3`)) {
+		t.Fatalf("fsm not works properly or hooks error, buf: %s", buf.Bytes())
+	}
+}

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

@@ -3,12 +3,11 @@ module go.unistack.org/micro/v3
 go 1.16
 
 require (
-	github.com/ef-ds/deque v1.0.4
-	github.com/golang-jwt/jwt/v4 v4.1.0
-	github.com/imdario/mergo v0.3.12
+	github.com/google/go-cmp v0.5.7 // indirect
+	github.com/imdario/mergo v0.3.13
+	github.com/kr/pretty v0.2.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible
-	github.com/silas/dag v0.0.0-20210626123444-3804bac2d6d4
-	github.com/unistack-org/micro-proto v0.0.9
-	golang.org/x/net v0.0.0-20210928044308-7d9f5e0b762b
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	github.com/silas/dag v0.0.0-20211117232152-9d50aa809f35
+	go.unistack.org/micro-proto/v3 v3.3.1
 )

go.sum

@@ -1,37 +1,160 @@
-github.com/ef-ds/deque v1.0.4 h1:iFAZNmveMT9WERAkqLJ+oaABF9AcVQ5AjXem/hroniI=
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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

@@ -81,6 +81,8 @@ func (l *defaultLogger) Fields(fields ...interface{}) Logger {
 	} else if len(fields)%2 != 0 {
 		fields = fields[:len(fields)-1]
 	}
+	nl.logFunc = l.logFunc
+	nl.logfFunc = l.logfFunc
 	nl.opts.Fields = append(nl.opts.Fields, fields...)
 	return nl
 }

logger/logger.go

@@ -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 +7,37 @@ 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)
+	}
+	l.Fields("key", "val").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)

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 +1,551 @@
+package unwrap
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"reflect"
+	"strconv"
+	"strings"
+
+	"go.unistack.org/micro/v3/codec"
+)
+
+const sf = "0-+# "
+
+var hexDigits = "0123456789abcdef"
+
+var (
+	panicBytes         = []byte("(PANIC=")
+	plusBytes          = []byte("+")
+	iBytes             = []byte("i")
+	trueBytes          = []byte("true")
+	falseBytes         = []byte("false")
+	interfaceBytes     = []byte("(interface {})")
+	openBraceBytes     = []byte("{")
+	closeBraceBytes    = []byte("}")
+	asteriskBytes      = []byte("*")
+	ampBytes           = []byte("&")
+	colonBytes         = []byte(":")
+	openParenBytes     = []byte("(")
+	closeParenBytes    = []byte(")")
+	spaceBytes         = []byte(" ")
+	commaBytes         = []byte(",")
+	pointerChainBytes  = []byte("->")
+	nilAngleBytes      = []byte("<nil>")
+	circularShortBytes = []byte("<shown>")
+	invalidAngleBytes  = []byte("<invalid>")
+	openBracketBytes   = []byte("[")
+	closeBracketBytes  = []byte("]")
+	percentBytes       = []byte("%")
+	precisionBytes     = []byte(".")
+	openAngleBytes     = []byte("<")
+	closeAngleBytes    = []byte(">")
+	openMapBytes       = []byte("{")
+	closeMapBytes      = []byte("}")
+)
+
+type unwrap struct {
+	val            interface{}
+	s              fmt.State
+	depth          int
+	pointers       map[uintptr]int
+	opts           *Options
+	ignoreNextType bool
+}
+
+type Options struct {
+	Codec         codec.Codec
+	Indent        string
+	UnwrapMethods bool
+}
+
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		Indent:        " ",
+		UnwrapMethods: false,
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+type Option func(*Options)
+
+func UnwrapIndent(f string) Option {
+	return func(o *Options) {
+		o.Indent = f
+	}
+}
+
+func UnwrapMethods(b bool) Option {
+	return func(o *Options) {
+		o.UnwrapMethods = b
+	}
+}
+
+func UnwrapCodec(c codec.Codec) Option {
+	return func(o *Options) {
+		o.Codec = c
+	}
+}
+
+func Unwrap(val interface{}, opts ...Option) *unwrap {
+	options := NewOptions(opts...)
+	return &unwrap{val: val, opts: &options, pointers: make(map[uintptr]int)}
+}
+
+func (f *unwrap) unpackValue(v reflect.Value) reflect.Value {
+	if v.Kind() == reflect.Interface {
+		f.ignoreNextType = false
+		if !v.IsNil() {
+			v = v.Elem()
+		}
+	}
+	return v
+}
+
+// formatPtr handles formatting of pointers by indirecting them as necessary.
+func (f *unwrap) formatPtr(v reflect.Value) {
+	// Display nil if top level pointer is nil.
+	showTypes := f.s.Flag('#')
+	if v.IsNil() && (!showTypes || f.ignoreNextType) {
+		_, _ = f.s.Write(nilAngleBytes)
+		return
+	}
+
+	// Remove pointers at or below the current depth from map used to detect
+	// circular refs.
+	for k, depth := range f.pointers {
+		if depth >= f.depth {
+			delete(f.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 := f.pointers[addr]; ok && pd < f.depth {
+			cycleFound = true
+			indirects--
+			break
+		}
+		f.pointers[addr] = f.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 && !f.ignoreNextType {
+		if f.depth > 0 {
+			_, _ = f.s.Write(openParenBytes)
+		}
+		if f.depth > 0 {
+			_, _ = f.s.Write(bytes.Repeat(asteriskBytes, indirects))
+		} else {
+			_, _ = f.s.Write(bytes.Repeat(ampBytes, indirects))
+		}
+		_, _ = f.s.Write([]byte(ve.Type().String()))
+		if f.depth > 0 {
+			_, _ = f.s.Write(closeParenBytes)
+		}
+	} else {
+		if nilFound || cycleFound {
+			indirects += strings.Count(ve.Type().String(), "*")
+		}
+		_, _ = f.s.Write(openAngleBytes)
+		_, _ = f.s.Write([]byte(strings.Repeat("*", indirects)))
+		_, _ = f.s.Write(closeAngleBytes)
+	}
+
+	// Display pointer information depending on flags.
+	if f.s.Flag('+') && (len(pointerChain) > 0) {
+		_, _ = f.s.Write(openParenBytes)
+		for i, addr := range pointerChain {
+			if i > 0 {
+				_, _ = f.s.Write(pointerChainBytes)
+			}
+			getHexPtr(f.s, addr)
+		}
+		_, _ = f.s.Write(closeParenBytes)
+	}
+
+	// Display dereferenced value.
+	switch {
+	case nilFound:
+		_, _ = f.s.Write(nilAngleBytes)
+
+	case cycleFound:
+		_, _ = f.s.Write(circularShortBytes)
+
+	default:
+		f.ignoreNextType = true
+		f.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 (f *unwrap) format(v reflect.Value) {
+	if f.opts.Codec != nil {
+		buf, err := f.opts.Codec.Marshal(v.Interface())
+		if err != nil {
+			_, _ = f.s.Write(invalidAngleBytes)
+			return
+		}
+		_, _ = f.s.Write(buf)
+		return
+	}
+	// Handle invalid reflect values immediately.
+	kind := v.Kind()
+	if kind == reflect.Invalid {
+		_, _ = f.s.Write(invalidAngleBytes)
+		return
+	}
+
+	// Handle pointers specially.
+	if kind == reflect.Ptr {
+		f.formatPtr(v)
+		return
+	}
+
+	// get type information unless already handled elsewhere.
+	if !f.ignoreNextType && f.s.Flag('#') {
+		if v.Type().Kind() != reflect.Map &&
+			v.Type().Kind() != reflect.String &&
+			v.Type().Kind() != reflect.Array &&
+			v.Type().Kind() != reflect.Slice {
+			_, _ = f.s.Write(openParenBytes)
+		}
+		if v.Kind() != reflect.String {
+			_, _ = f.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 {
+			_, _ = f.s.Write(closeParenBytes)
+		}
+	}
+	f.ignoreNextType = false
+
+	// Call Stringer/error interfaces if they exist and the handle methods
+	// flag is enabled.
+	if !f.opts.UnwrapMethods {
+		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
+			if handled := handleMethods(f.opts, f.s, v); handled {
+				return
+			}
+		}
+	}
+
+	switch kind {
+	case reflect.Invalid:
+		_, _ = f.s.Write(invalidAngleBytes)
+	case reflect.Bool:
+		getBool(f.s, v.Bool())
+	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
+		getInt(f.s, v.Int(), 10)
+	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
+		getUint(f.s, v.Uint(), 10)
+	case reflect.Float32:
+		getFloat(f.s, v.Float(), 32)
+	case reflect.Float64:
+		getFloat(f.s, v.Float(), 64)
+	case reflect.Complex64:
+		getComplex(f.s, v.Complex(), 32)
+	case reflect.Complex128:
+		getComplex(f.s, v.Complex(), 64)
+	case reflect.Slice:
+		if v.IsNil() {
+			_, _ = f.s.Write(nilAngleBytes)
+			break
+		}
+		fallthrough
+	case reflect.Array:
+		_, _ = f.s.Write(openBraceBytes)
+		f.depth++
+		numEntries := v.Len()
+		for i := 0; i < numEntries; i++ {
+			if i > 0 {
+				_, _ = f.s.Write(commaBytes)
+				_, _ = f.s.Write(spaceBytes)
+			}
+			f.ignoreNextType = true
+			f.format(f.unpackValue(v.Index(i)))
+		}
+		f.depth--
+		_, _ = f.s.Write(closeBraceBytes)
+	case reflect.String:
+		_, _ = f.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() {
+			_, _ = f.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() {
+			_, _ = f.s.Write(nilAngleBytes)
+			break
+		}
+		_, _ = f.s.Write(openMapBytes)
+		f.depth++
+		keys := v.MapKeys()
+		for i, key := range keys {
+			if i > 0 {
+				_, _ = f.s.Write(spaceBytes)
+			}
+			f.ignoreNextType = true
+			f.format(f.unpackValue(key))
+			_, _ = f.s.Write(colonBytes)
+			f.ignoreNextType = true
+			f.format(f.unpackValue(v.MapIndex(key)))
+		}
+		f.depth--
+		_, _ = f.s.Write(closeMapBytes)
+	case reflect.Struct:
+		numFields := v.NumField()
+		_, _ = f.s.Write(openBraceBytes)
+		f.depth++
+		vt := v.Type()
+		prevSkip := false
+		for i := 0; i < numFields; i++ {
+			sv, ok := vt.Field(i).Tag.Lookup("logger")
+			if ok && sv == "omit" {
+				prevSkip = true
+				continue
+			}
+			if i > 0 && !prevSkip {
+				_, _ = f.s.Write(commaBytes)
+				_, _ = f.s.Write(spaceBytes)
+			}
+			if prevSkip {
+				prevSkip = false
+			}
+			vtf := vt.Field(i)
+			if f.s.Flag('+') || f.s.Flag('#') {
+				_, _ = f.s.Write([]byte(vtf.Name))
+				_, _ = f.s.Write(colonBytes)
+			}
+			f.format(f.unpackValue(v.Field(i)))
+		}
+		f.depth--
+		_, _ = f.s.Write(closeBraceBytes)
+	case reflect.Uintptr:
+		getHexPtr(f.s, uintptr(v.Uint()))
+	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
+		getHexPtr(f.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 := f.buildDefaultFormat()
+		if v.CanInterface() {
+			_, _ = fmt.Fprintf(f.s, format, v.Interface())
+		} else {
+			_, _ = fmt.Fprintf(f.s, format, v.String())
+		}
+	}
+}
+
+func (f *unwrap) Format(s fmt.State, verb rune) {
+	f.s = s
+
+	// Use standard formatting for verbs that are not v.
+	if verb != 'v' {
+		format := f.constructOrigFormat(verb)
+		_, _ = fmt.Fprintf(s, format, f.val)
+		return
+	}
+
+	if f.val == nil {
+		if s.Flag('#') {
+			_, _ = s.Write(interfaceBytes)
+		}
+		_, _ = s.Write(nilAngleBytes)
+		return
+	}
+
+	f.format(reflect.ValueOf(f.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 (f *unwrap) buildDefaultFormat() (format string) {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range sf {
+		if f.s.Flag(int(flag)) {
+			_, _ = buf.WriteRune(flag)
+		}
+	}
+
+	_, _ = buf.WriteRune('v')
+
+	format = buf.String()
+	return format
+}
+
+func (f *unwrap) constructOrigFormat(verb rune) (format string) {
+	buf := bytes.NewBuffer(percentBytes)
+
+	for _, flag := range sf {
+		if f.s.Flag(int(flag)) {
+			_, _ = buf.WriteRune(flag)
+		}
+	}
+
+	if width, ok := f.s.Width(); ok {
+		_, _ = buf.WriteString(strconv.Itoa(width))
+	}
+
+	if precision, ok := f.s.Precision(); ok {
+		_, _ = buf.Write(precisionBytes)
+		_, _ = buf.WriteString(strconv.Itoa(precision))
+	}
+
+	_, _ = buf.WriteRune(verb)
+
+	format = buf.String()
+	return format
+}

logger/unwrap/unwrap_test.go

@@ -0,0 +1,59 @@
+package unwrap
+
+import (
+	"testing"
+
+	"go.unistack.org/micro/v3/codec"
+)
+
+func TestUnwrapOmit(t *testing.T) {
+	type val struct {
+		MP  map[string]string `json:"mp" logger:"omit"`
+		STR string            `json:"str"`
+		AR  []string          `json:"ar"`
+	}
+
+	v1 := &val{AR: []string{"string1", "string2"}, STR: "string", MP: map[string]string{"key": "val"}}
+
+	t.Logf("output: %#v", v1)
+	t.Logf("output: %#v", Unwrap(v1))
+}
+
+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"}}
+
+	t.Logf("output: %#v", Unwrap(v1))
+
+	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"}}
+
+	t.Logf("output: %#v", v2)
+}
+
+func TestUnwrapCodec(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"}}
+
+	t.Logf("output: %#v", Unwrap(v1, UnwrapCodec(codec.NewCodec())))
+}

logger/wrapper.go

@@ -20,104 +20,104 @@ type Wrapper interface {
 	Logf(LogfFunc) LogfFunc
 }
 
-var _ Logger = &OmitLogger{}
+var _ Logger = &omitLogger{}
 
-type OmitLogger struct {
+type omitLogger struct {
 	l Logger
 }
 
 func NewOmitLogger(l Logger) Logger {
-	return &OmitLogger{l: l}
+	return &omitLogger{l: l}
 }
 
-func (w *OmitLogger) Init(opts ...Option) error {
+func (w *omitLogger) Init(opts ...Option) error {
 	return w.l.Init(append(opts, WrapLogger(NewOmitWrapper()))...)
 }
 
-func (w *OmitLogger) V(level Level) bool {
+func (w *omitLogger) V(level Level) bool {
 	return w.l.V(level)
 }
 
-func (w *OmitLogger) Level(level Level) {
+func (w *omitLogger) Level(level Level) {
 	w.l.Level(level)
 }
 
-func (w *OmitLogger) Clone(opts ...Option) Logger {
+func (w *omitLogger) Clone(opts ...Option) Logger {
 	return w.l.Clone(opts...)
 }
 
-func (w *OmitLogger) Options() Options {
+func (w *omitLogger) Options() Options {
 	return w.l.Options()
 }
 
-func (w *OmitLogger) Fields(fields ...interface{}) Logger {
+func (w *omitLogger) Fields(fields ...interface{}) Logger {
 	return w.l.Fields(fields...)
 }
 
-func (w *OmitLogger) Info(ctx context.Context, args ...interface{}) {
+func (w *omitLogger) Info(ctx context.Context, args ...interface{}) {
 	w.l.Info(ctx, args...)
 }
 
-func (w *OmitLogger) Trace(ctx context.Context, args ...interface{}) {
+func (w *omitLogger) Trace(ctx context.Context, args ...interface{}) {
 	w.l.Trace(ctx, args...)
 }
 
-func (w *OmitLogger) Debug(ctx context.Context, args ...interface{}) {
+func (w *omitLogger) Debug(ctx context.Context, args ...interface{}) {
 	w.l.Debug(ctx, args...)
 }
 
-func (w *OmitLogger) Warn(ctx context.Context, args ...interface{}) {
+func (w *omitLogger) Warn(ctx context.Context, args ...interface{}) {
 	w.l.Warn(ctx, args...)
 }
 
-func (w *OmitLogger) Error(ctx context.Context, args ...interface{}) {
+func (w *omitLogger) Error(ctx context.Context, args ...interface{}) {
 	w.l.Error(ctx, args...)
 }
 
-func (w *OmitLogger) Fatal(ctx context.Context, args ...interface{}) {
+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{}) {
+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{}) {
+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{}) {
+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{}) {
+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{}) {
+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{}) {
+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{}) {
+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{}) {
+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 {
+func (w *omitLogger) String() string {
 	return w.l.String()
 }
 
-type OmitWrapper struct{}
+type omitWrapper struct{}
 
 func NewOmitWrapper() Wrapper {
-	return &OmitWrapper{}
+	return &omitWrapper{}
 }
 
 func getArgs(args []interface{}) []interface{} {
@@ -153,13 +153,13 @@ func getArgs(args []interface{}) []interface{} {
 	return nargs
 }
 
-func (w *OmitWrapper) Log(fn LogFunc) LogFunc {
+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 {
+func (w *omitWrapper) Logf(fn LogfFunc) LogfFunc {
 	return func(ctx context.Context, level Level, msg string, args ...interface{}) {
 		fn(ctx, level, msg, getArgs(args)...)
 	}

logger/wrapper/wrapper.go

@@ -11,6 +11,7 @@ import (
 )
 
 var (
+	// DefaultClientCallObserver called by wrapper in client Call
 	DefaultClientCallObserver = func(ctx context.Context, req client.Request, rsp interface{}, opts []client.CallOption, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
 		if err != nil {
@@ -19,6 +20,7 @@ var (
 		return labels
 	}
 
+	// DefaultClientStreamObserver called by wrapper in client Stream
 	DefaultClientStreamObserver = func(ctx context.Context, req client.Request, opts []client.CallOption, stream client.Stream, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
 		if err != nil {
@@ -27,6 +29,7 @@ var (
 		return labels
 	}
 
+	// DefaultClientPublishObserver called by wrapper in client Publish
 	DefaultClientPublishObserver = func(ctx context.Context, msg client.Message, opts []client.PublishOption, err error) []string {
 		labels := []string{"endpoint", msg.Topic()}
 		if err != nil {
@@ -35,6 +38,7 @@ var (
 		return labels
 	}
 
+	// DefaultServerHandlerObserver called by wrapper in server Handler
 	DefaultServerHandlerObserver = func(ctx context.Context, req server.Request, rsp interface{}, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
 		if err != nil {
@@ -43,6 +47,7 @@ var (
 		return labels
 	}
 
+	// DefaultServerSubscriberObserver called by wrapper in server Subscriber
 	DefaultServerSubscriberObserver = func(ctx context.Context, msg server.Message, err error) []string {
 		labels := []string{"endpoint", msg.Topic()}
 		if err != nil {
@@ -51,6 +56,7 @@ var (
 		return labels
 	}
 
+	// DefaultClientCallFuncObserver called by wrapper in client CallFunc
 	DefaultClientCallFuncObserver = func(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
 		if err != nil {
@@ -59,6 +65,7 @@ var (
 		return labels
 	}
 
+	// DefaultSkipEndpoints wrapper not called for this endpoints
 	DefaultSkipEndpoints = []string{"Meter.Metrics"}
 )
 
@@ -71,11 +78,17 @@ type lWrapper struct {
 }
 
 type (
-	ClientCallObserver       func(context.Context, client.Request, interface{}, []client.CallOption, error) []string
-	ClientStreamObserver     func(context.Context, client.Request, []client.CallOption, client.Stream, error) []string
-	ClientPublishObserver    func(context.Context, client.Message, []client.PublishOption, error) []string
-	ClientCallFuncObserver   func(context.Context, string, client.Request, interface{}, client.CallOptions, error) []string
-	ServerHandlerObserver    func(context.Context, server.Request, interface{}, error) []string
+	// ClientCallObserver func signature
+	ClientCallObserver func(context.Context, client.Request, interface{}, []client.CallOption, error) []string
+	// ClientStreamObserver func signature
+	ClientStreamObserver func(context.Context, client.Request, []client.CallOption, client.Stream, error) []string
+	// ClientPublishObserver func signature
+	ClientPublishObserver func(context.Context, client.Message, []client.PublishOption, error) []string
+	// ClientCallFuncObserver func signature
+	ClientCallFuncObserver func(context.Context, string, client.Request, interface{}, client.CallOptions, error) []string
+	// ServerHandlerObserver func signature
+	ServerHandlerObserver func(context.Context, server.Request, interface{}, error) []string
+	// ServerSubscriberObserver func signature
 	ServerSubscriberObserver func(context.Context, server.Message, error) []string
 )
 

metadata/context_test.go

@@ -0,0 +1,140 @@
+package metadata
+
+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, New(0))
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), mdKey{}, &rawMetadata{New(0)})
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), New(0))
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestFromIncomingContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), mdIncomingKey{}, &rawMetadata{New(0)})
+
+	c, ok := FromIncomingContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromIncomingContext not works")
+	}
+}
+
+func TestFromOutgoingContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), mdOutgoingKey{}, &rawMetadata{New(0)})
+
+	c, ok := FromOutgoingContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromOutgoingContext not works")
+	}
+}
+
+func TestSetIncomingContext(t *testing.T) {
+	md := New(1)
+	md.Set("key", "val")
+	ctx := context.WithValue(context.TODO(), mdIncomingKey{}, &rawMetadata{})
+	if !SetIncomingContext(ctx, md) {
+		t.Fatal("SetIncomingContext not works")
+	}
+	md, ok := FromIncomingContext(ctx)
+	if md == nil || !ok {
+		t.Fatal("SetIncomingContext not works")
+	} else if v, ok := md.Get("key"); !ok || v != "val" {
+		t.Fatal("SetIncomingContext not works")
+	}
+}
+
+func TestSetOutgoingContext(t *testing.T) {
+	md := New(1)
+	md.Set("key", "val")
+	ctx := context.WithValue(context.TODO(), mdOutgoingKey{}, &rawMetadata{})
+	if !SetOutgoingContext(ctx, md) {
+		t.Fatal("SetOutgoingContext not works")
+	}
+	md, ok := FromOutgoingContext(ctx)
+	if md == nil || !ok {
+		t.Fatal("SetOutgoingContext not works")
+	} else if v, ok := md.Get("key"); !ok || v != "val" {
+		t.Fatal("SetOutgoingContext not works")
+	}
+}
+
+func TestNewIncomingContext(t *testing.T) {
+	md := New(1)
+	md.Set("key", "val")
+	ctx := NewIncomingContext(context.TODO(), md)
+
+	c, ok := FromIncomingContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewIncomingContext not works")
+	}
+}
+
+func TestNewOutgoingContext(t *testing.T) {
+	md := New(1)
+	md.Set("key", "val")
+	ctx := NewOutgoingContext(context.TODO(), md)
+
+	c, ok := FromOutgoingContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewOutgoingContext not works")
+	}
+}
+
+func TestAppendIncomingContext(t *testing.T) {
+	md := New(1)
+	md.Set("key1", "val1")
+	ctx := AppendIncomingContext(context.TODO(), "key2", "val2")
+
+	nmd, ok := FromIncomingContext(ctx)
+	if nmd == nil || !ok {
+		t.Fatal("AppendIncomingContext not works")
+	}
+	if v, ok := nmd.Get("key2"); !ok || v != "val2" {
+		t.Fatal("AppendIncomingContext not works")
+	}
+}
+
+func TestAppendOutgoingContext(t *testing.T) {
+	md := New(1)
+	md.Set("key1", "val1")
+	ctx := AppendOutgoingContext(context.TODO(), "key2", "val2")
+
+	nmd, ok := FromOutgoingContext(ctx)
+	if nmd == nil || !ok {
+		t.Fatal("AppendOutgoingContext not works")
+	}
+	if v, ok := nmd.Get("key2"); !ok || v != "val2" {
+		t.Fatal("AppendOutgoingContext not works")
+	}
+}

metadata/metadata.go

@@ -76,16 +76,23 @@ func (md Metadata) Get(key string) (string, bool) {
 }
 
 // Set is used to store value in metadata
-func (md Metadata) Set(key, val string) {
-	md[textproto.CanonicalMIMEHeaderKey(key)] = val
+func (md Metadata) Set(kv ...string) {
+	if len(kv)%2 == 1 {
+		kv = kv[:len(kv)-1]
+	}
+	for idx := 0; idx < len(kv); idx += 2 {
+		md[textproto.CanonicalMIMEHeaderKey(kv[idx])] = kv[idx+1]
+	}
 }
 
 // Del is used to remove value from metadata
-func (md Metadata) Del(key string) {
-	// fast path
-	delete(md, key)
-	// slow path
-	delete(md, textproto.CanonicalMIMEHeaderKey(key))
+func (md Metadata) Del(keys ...string) {
+	for _, key := range keys {
+		// fast path
+		delete(md, key)
+		// slow path
+		delete(md, textproto.CanonicalMIMEHeaderKey(key))
+	}
 }
 
 // Copy makes a copy of the metadata
@@ -129,13 +136,6 @@ func Pairs(kv ...string) (Metadata, bool) {
 		return nil, false
 	}
 	md := New(len(kv) / 2)
-	var k string
-	for i, v := range kv {
-		if i%2 == 0 {
-			k = v
-			continue
-		}
-		md.Set(k, v)
-	}
+	md.Set(kv...)
 	return md, true
 }

metadata/metadata_test.go

@@ -5,6 +5,21 @@ import (
 	"testing"
 )
 
+func TestMetadataSetMultiple(t *testing.T) {
+	md := New(4)
+	md.Set("key1", "val1", "key2", "val2", "key3")
+
+	if v, ok := md.Get("key1"); !ok || v != "val1" {
+		t.Fatalf("invalid kv %#+v", md)
+	}
+	if v, ok := md.Get("key2"); !ok || v != "val2" {
+		t.Fatalf("invalid kv %#+v", md)
+	}
+	if _, ok := md.Get("key3"); ok {
+		t.Fatalf("invalid kv %#+v", md)
+	}
+}
+
 func TestAppend(t *testing.T) {
 	ctx := context.Background()
 	ctx = AppendIncomingContext(ctx, "key1", "val1", "key2", "val2")

meter/context_test.go

@@ -0,0 +1,53 @@
+package meter
+
+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, NewMeter())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), meterKey{}, NewMeter())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewMeter())
+
+	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")
+	}
+}

meter/generate.go

@@ -1,12 +1,12 @@
 package meter
 
-//go:generate sh -c "protoc -I./handler -I../ -I$(go list -f '{{ .Dir }}' -m github.com/unistack-org/micro-proto) --go-micro_out='components=micro|http|server',standalone=false,debug=true,paths=source_relative:./handler handler/handler.proto"
+//go:generate sh -c "protoc -I./handler -I../ -I$(go list -f '{{ .Dir }}' -m go.unistack.org/micro-proto/v3) --go-micro_out='components=micro|http|server',standalone=false,debug=true,paths=source_relative:./handler handler/handler.proto"
 
 import (
 
 	// import required packages
-	_ "github.com/unistack-org/micro-proto/api"
+	_ "go.unistack.org/micro-proto/v3/api"
 
 	// import required packages
-	_ "github.com/unistack-org/micro-proto/openapiv2"
+	_ "go.unistack.org/micro-proto/v3/openapiv3"
 )

meter/handler/handler.proto

@@ -1,24 +1,20 @@
 syntax = "proto3";
 
 package micro.meter.handler;
-option go_package = "github.com/unistack-org/micro/v3/meter/handler;handler";
+option go_package = "go.unistack.org/micro/v3/meter/handler;handler";
 
 import "api/annotations.proto";
-import "openapiv2/annotations.proto";
+import "openapiv3/annotations.proto";
 import "codec/frame.proto";
 
 service Meter {
 	rpc Metrics(micro.codec.Frame) returns (micro.codec.Frame) {
-		option (micro.openapiv2.openapiv2_operation) = {
+		option (micro.openapiv3.openapiv3_operation) = {
       operation_id: "Metrics";
       responses: {
-        response_code: {
-          name: "default";
-          value: {
-            json_reference: {
-              description: "Error response";
-              _ref: "micro.codec.Frame";
-            };
+        default: {
+          reference: {
+            _ref: "micro.codec.Frame";
           };
         };
       };

meter/handler/handler_micro.pb.go

@@ -1,12 +1,11 @@
 // Code generated by protoc-gen-go-micro. DO NOT EDIT.
-// protoc-gen-go-micro version: v3.4.2
+// protoc-gen-go-micro version: v3.5.3
 // source: handler.proto
 
 package handler
 
 import (
 	context "context"
-
 	api "go.unistack.org/micro/v3/api"
 	codec "go.unistack.org/micro/v3/codec"
 )

meter/handler/handler_micro_http.pb.go

@@ -1,12 +1,11 @@
 // Code generated by protoc-gen-go-micro. DO NOT EDIT.
-// protoc-gen-go-micro version: v3.4.2
+// protoc-gen-go-micro version: v3.5.3
 // source: handler.proto
 
 package handler
 
 import (
 	context "context"
-
 	api "go.unistack.org/micro/v3/api"
 	codec "go.unistack.org/micro/v3/codec"
 	server "go.unistack.org/micro/v3/server"

meter/meter.go

@@ -11,7 +11,7 @@ import (
 
 var (
 	// DefaultMeter is the default meter
-	DefaultMeter Meter = NewMeter()
+	DefaultMeter = NewMeter()
 	// DefaultAddress data will be made available on this host:port
 	DefaultAddress = ":9090"
 	// DefaultPath the meter endpoint where the Meter data will be made available
@@ -102,7 +102,7 @@ func (k byKey) Swap(i, j int) {
 	k[i*2+1], k[j*2+1] = k[j*2+1], k[i*2+1]
 }
 
-// BuildLables used to sort labels and delete duplicates.
+// BuildLabels used to sort labels and delete duplicates.
 // Last value wins in case of duplicate label keys.
 func BuildLabels(labels ...string) []string {
 	if len(labels)%2 == 1 {

meter/options.go

@@ -9,7 +9,7 @@ import (
 // Option powers the configuration for metrics implementations:
 type Option func(*Options)
 
-// Options for metrics implementations:
+// Options for metrics implementations
 type Options struct {
 	// Logger used for logging
 	Logger logger.Logger
@@ -102,6 +102,7 @@ func Logger(l logger.Logger) Option {
 	}
 }
 
+// Labels sets the meter labels
 func Labels(ls ...string) Option {
 	return func(o *Options) {
 		o.Labels = append(o.Labels, ls...)

meter/wrapper/wrapper.go

@@ -11,25 +11,38 @@ import (
 )
 
 var (
-	ClientRequestDurationSeconds     = "client_request_duration_seconds"
+	// ClientRequestDurationSeconds specifies meter metric name
+	ClientRequestDurationSeconds = "client_request_duration_seconds"
+	// ClientRequestLatencyMicroseconds specifies meter metric name
 	ClientRequestLatencyMicroseconds = "client_request_latency_microseconds"
-	ClientRequestTotal               = "client_request_total"
-	ClientRequestInflight            = "client_request_inflight"
-
-	ServerRequestDurationSeconds     = "server_request_duration_seconds"
+	// ClientRequestTotal specifies meter metric name
+	ClientRequestTotal = "client_request_total"
+	// ClientRequestInflight specifies meter metric name
+	ClientRequestInflight = "client_request_inflight"
+	// ServerRequestDurationSeconds specifies meter metric name
+	ServerRequestDurationSeconds = "server_request_duration_seconds"
+	// ServerRequestLatencyMicroseconds specifies meter metric name
 	ServerRequestLatencyMicroseconds = "server_request_latency_microseconds"
-	ServerRequestTotal               = "server_request_total"
-	ServerRequestInflight            = "server_request_inflight"
-
-	PublishMessageDurationSeconds     = "publish_message_duration_seconds"
+	// ServerRequestTotal specifies meter metric name
+	ServerRequestTotal = "server_request_total"
+	// ServerRequestInflight specifies meter metric name
+	ServerRequestInflight = "server_request_inflight"
+	// PublishMessageDurationSeconds specifies meter metric name
+	PublishMessageDurationSeconds = "publish_message_duration_seconds"
+	// PublishMessageLatencyMicroseconds specifies meter metric name
 	PublishMessageLatencyMicroseconds = "publish_message_latency_microseconds"
-	PublishMessageTotal               = "publish_message_total"
-	PublishMessageInflight            = "publish_message_inflight"
-
-	SubscribeMessageDurationSeconds     = "subscribe_message_duration_seconds"
+	// 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               = "subscribe_message_total"
-	SubscribeMessageInflight            = "subscribe_message_inflight"
+	// SubscribeMessageTotal specifies meter metric name
+	SubscribeMessageTotal = "subscribe_message_total"
+	// SubscribeMessageInflight specifies meter metric name
+	SubscribeMessageInflight = "subscribe_message_inflight"
 
 	labelSuccess  = "success"
 	labelFailure  = "failure"
@@ -40,14 +53,17 @@ var (
 	DefaultSkipEndpoints = []string{"Meter.Metrics"}
 )
 
+// Options struct
 type Options struct {
 	Meter         meter.Meter
 	lopts         []meter.Option
 	SkipEndpoints []string
 }
 
+// Option func signature
 type Option func(*Options)
 
+// NewOptions creates new Options struct
 func NewOptions(opts ...Option) Options {
 	options := Options{
 		Meter:         meter.DefaultMeter,
@@ -60,30 +76,35 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
+// ServiceName passes service name to meter label
 func ServiceName(name string) Option {
 	return func(o *Options) {
 		o.lopts = append(o.lopts, meter.Labels("name", name))
 	}
 }
 
+// ServiceVersion passes service version to meter label
 func ServiceVersion(version string) Option {
 	return func(o *Options) {
 		o.lopts = append(o.lopts, meter.Labels("version", version))
 	}
 }
 
+// ServiceID passes service id to meter label
 func ServiceID(id string) Option {
 	return func(o *Options) {
 		o.lopts = append(o.lopts, meter.Labels("id", id))
 	}
 }
 
+// Meter passes meter
 func Meter(m meter.Meter) Option {
 	return func(o *Options) {
 		o.Meter = m
 	}
 }
 
+// SkipEndoints add endpoint to skip
 func SkipEndoints(eps ...string) Option {
 	return func(o *Options) {
 		o.SkipEndpoints = append(o.SkipEndpoints, eps...)
@@ -96,6 +117,7 @@ type wrapper struct {
 	opts     Options
 }
 
+// NewClientWrapper create new client wrapper
 func NewClientWrapper(opts ...Option) client.Wrapper {
 	return func(c client.Client) client.Client {
 		handler := &wrapper{
@@ -106,6 +128,7 @@ func NewClientWrapper(opts ...Option) client.Wrapper {
 	}
 }
 
+// NewCallWrapper create new call wrapper
 func NewCallWrapper(opts ...Option) client.CallWrapper {
 	return func(fn client.CallFunc) client.CallFunc {
 		handler := &wrapper{
@@ -231,6 +254,7 @@ func (w *wrapper) Publish(ctx context.Context, p client.Message, opts ...client.
 	return err
 }
 
+// NewHandlerWrapper create new server handler wrapper
 func NewHandlerWrapper(opts ...Option) server.HandlerWrapper {
 	handler := &wrapper{
 		opts: NewOptions(opts...),
@@ -240,7 +264,7 @@ func NewHandlerWrapper(opts ...Option) server.HandlerWrapper {
 
 func (w *wrapper) HandlerFunc(fn server.HandlerFunc) server.HandlerFunc {
 	return func(ctx context.Context, req server.Request, rsp interface{}) error {
-		endpoint := req.Endpoint()
+		endpoint := req.Service() + "." + req.Endpoint()
 		for _, ep := range w.opts.SkipEndpoints {
 			if ep == endpoint {
 				return fn(ctx, req, rsp)
@@ -270,6 +294,7 @@ func (w *wrapper) HandlerFunc(fn server.HandlerFunc) server.HandlerFunc {
 	}
 }
 
+// NewSubscriberWrapper create server subscribe wrapper
 func NewSubscriberWrapper(opts ...Option) server.SubscriberWrapper {
 	handler := &wrapper{
 		opts: NewOptions(opts...),

micro.go

@@ -1 +0,0 @@
-package micro // import "go.unistack.org/micro/v3"

mtls/mtls.go

@@ -0,0 +1,247 @@
+package mtls // import "go.unistack.org/micro/v3/mtls"
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/ed25519"
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"sync"
+)
+
+var bp = newBPool()
+
+type bpool struct {
+	pool sync.Pool
+}
+
+func newBPool() *bpool {
+	var bp bpool
+	bp.pool.New = alloc
+	return &bp
+}
+
+func alloc() interface{} {
+	return &bytes.Buffer{}
+}
+
+func (bp *bpool) Get() *bytes.Buffer {
+	return bp.pool.Get().(*bytes.Buffer)
+}
+
+func (bp *bpool) Put(buf *bytes.Buffer) {
+	buf.Reset()
+	bp.pool.Put(buf)
+}
+
+// NewCA creates new CA keypair
+func NewCA(opts ...CertificateOption) ([]byte, crypto.PrivateKey, error) {
+	options := NewCertificateOptions(opts...)
+
+	crtreq := &x509.CertificateRequest{
+		Subject: pkix.Name{
+			Organization:       options.Organization,
+			OrganizationalUnit: options.OrganizationalUnit,
+			CommonName:         options.CommonName,
+		},
+		SignatureAlgorithm: options.SignatureAlgorithm,
+	}
+
+	pemcsr, pemkey, err := newCsr(crtreq)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	pemcrt, err := SignCSR(pemcsr, nil, pemkey, opts...)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return pemcrt, pemkey, nil
+}
+
+func NewIntermediate(cacrt *x509.Certificate, cakey crypto.PrivateKey, opts ...CertificateOption) ([]byte, crypto.PrivateKey, error) {
+	options := &CertificateOptions{}
+	for _, o := range opts {
+		o(options)
+	}
+
+	crtreq := &x509.CertificateRequest{
+		Subject: pkix.Name{
+			Organization:       options.Organization,
+			OrganizationalUnit: options.OrganizationalUnit,
+			CommonName:         options.CommonName,
+		},
+		SignatureAlgorithm: options.SignatureAlgorithm,
+	}
+
+	pemcsr, pemkey, err := newCsr(crtreq)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	pemcrt, err := SignCSR(pemcsr, cacrt, cakey)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return pemcrt, pemkey, nil
+}
+
+// SignCSR sign certificate request and return signed pubkey
+func SignCSR(rawcsr []byte, cacrt *x509.Certificate, cakey crypto.PrivateKey, opts ...CertificateOption) ([]byte, error) {
+	if cacrt == nil {
+		opts = append(opts, CertificateIsCA(true))
+	}
+
+	options := NewCertificateOptions(opts...)
+
+	csr, err := x509.ParseCertificateRequest(rawcsr)
+	if err == nil {
+		err = csr.CheckSignature()
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	tpl := &x509.Certificate{
+		Signature:             csr.Signature,
+		SignatureAlgorithm:    csr.SignatureAlgorithm,
+		PublicKeyAlgorithm:    csr.PublicKeyAlgorithm,
+		PublicKey:             csr.PublicKey,
+		SerialNumber:          options.SerialNumber,
+		OCSPServer:            options.OCSPServer,
+		IssuingCertificateURL: options.IssuingCertificateURL,
+		Subject:               csr.Subject,
+		NotBefore:             options.NotBefore,
+		NotAfter:              options.NotAfter,
+		KeyUsage:              options.KeyUsage,
+		ExtKeyUsage:           options.ExtKeyUsage,
+		BasicConstraintsValid: true,
+		IsCA:                  options.IsCA,
+	}
+
+	if options.IsCA {
+		cacrt = tpl
+	} else {
+		tpl.Issuer = cacrt.Subject
+	}
+
+	crt, err := x509.CreateCertificate(rand.Reader, tpl, cacrt, csr.PublicKey, cakey)
+	if err != nil {
+		return nil, err
+	}
+
+	return crt, nil
+}
+
+// NewCertificateRequest create new certificate signing request and return key, csr in byte slice and err
+func NewCertificateRequest(opts ...CertificateOption) ([]byte, crypto.PrivateKey, error) {
+	options := NewCertificateOptions(opts...)
+
+	crtreq := &x509.CertificateRequest{
+		Subject: pkix.Name{
+			Organization:       options.Organization,
+			OrganizationalUnit: options.OrganizationalUnit,
+			CommonName:         options.CommonName,
+		},
+		SignatureAlgorithm: options.SignatureAlgorithm,
+	}
+
+	return newCsr(crtreq)
+}
+
+// newCsr returns CSR and private key
+func newCsr(crtreq *x509.CertificateRequest) ([]byte, crypto.PrivateKey, error) {
+	_, key, err := ed25519.GenerateKey(rand.Reader)
+	if err != nil {
+		return nil, nil, err
+	}
+	csr, err := x509.CreateCertificateRequest(rand.Reader, crtreq, key)
+	if err != nil {
+		return nil, nil, err
+	}
+	return csr, key, nil
+}
+
+// ServerOptions holds server specific options
+type ServerOptions struct {
+	ServerName string
+	RootCAs    []string
+	ClientCAs  []string
+}
+
+// ServerOption func signature
+type ServerOption func(*ServerOptions)
+
+func NewServerConfig(src *tls.Config) *tls.Config {
+	dst := src.Clone()
+	// dst.InsecureSkipVerify = true
+	dst.MinVersion = tls.VersionTLS13
+	dst.ClientAuth = tls.VerifyClientCertIfGiven
+	return dst
+}
+
+func DecodeCrtKey(rawcrt []byte, rawkey []byte) (*x509.Certificate, crypto.PrivateKey, error) {
+	var crt *x509.Certificate
+	var key crypto.PrivateKey
+	var err error
+
+	crt, err = DecodeCrt(rawcrt)
+	if err == nil {
+		key, err = DecodeKey(rawkey)
+	}
+
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return crt, key, nil
+}
+
+func DecodeCrt(rawcrt []byte) (*x509.Certificate, error) {
+	pemcrt, _ := pem.Decode(rawcrt)
+	return x509.ParseCertificate(pemcrt.Bytes)
+}
+
+func EncodeCrt(crts ...*x509.Certificate) ([]byte, error) {
+	var err error
+	buf := bp.Get()
+	defer bp.Put(buf)
+	for _, crt := range crts {
+		if err = pem.Encode(buf, &pem.Block{Type: "CERTIFICATE", Bytes: crt.Raw}); err != nil {
+			return nil, err
+		}
+	}
+	return buf.Bytes(), nil
+}
+
+func EncodeCsr(csr *x509.Certificate) ([]byte, error) {
+	buf := bp.Get()
+	defer bp.Put(buf)
+	if err := pem.Encode(buf, &pem.Block{Type: "CERTIFICATE REQUEST", Bytes: csr.Raw}); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+func DecodeKey(rawkey []byte) (crypto.PrivateKey, error) {
+	pemkey, _ := pem.Decode(rawkey)
+	return x509.ParsePKCS8PrivateKey(pemkey.Bytes)
+}
+
+func EncodeKey(privkey crypto.PrivateKey) ([]byte, error) {
+	buf := bp.Get()
+	defer bp.Put(buf)
+	enckey, err := x509.MarshalPKCS8PrivateKey(privkey)
+	if err == nil {
+		err = pem.Encode(buf, &pem.Block{Type: "PRIVATE KEY", Bytes: enckey})
+	}
+	if err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}

mtls/mtls_test.go

@@ -0,0 +1,73 @@
+package mtls
+
+import (
+	"crypto/ed25519"
+	"crypto/x509"
+	"testing"
+)
+
+func TestNewCa(t *testing.T) {
+	bcrt, key, err := NewCA(
+		CertificateOrganization("test_org"),
+		CertificateOrganizationalUnit("test_unit"),
+		CertificateIsCA(true),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if _, ok := key.(ed25519.PrivateKey); !ok {
+		t.Fatalf("key is not ed25519")
+	}
+
+	crt, err := x509.ParseCertificate(bcrt)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !crt.IsCA {
+		t.Fatalf("crt IsCA invalid %v", crt)
+	}
+	if crt.Subject.Organization[0] != "test_org" {
+		t.Fatalf("crt subject invalid %v", crt.Subject)
+	}
+	if crt.Subject.OrganizationalUnit[0] != "test_unit" {
+		t.Fatalf("crt subject invalid %v", crt.Subject)
+	}
+}
+
+func TestNewIntermediate(t *testing.T) {
+	bcrt, cakey, err := NewCA(
+		CertificateOrganization("test_org"),
+		CertificateOrganizationalUnit("test_unit"),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	cacrt, err := x509.ParseCertificate(bcrt)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	bcrt, ikey, err := NewIntermediate(cacrt, cakey,
+		CertificateOrganization("test_org"),
+		CertificateOrganizationalUnit("test_unit"),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = ikey
+	icrt, err := x509.ParseCertificate(bcrt)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if icrt.IsCA {
+		t.Fatalf("crt IsCA invalid %v", icrt)
+	}
+	if icrt.Subject.Organization[0] != "test_org" {
+		t.Fatalf("crt subject invalid %v", icrt.Subject)
+	}
+	if icrt.Subject.OrganizationalUnit[0] != "test_unit" {
+		t.Fatalf("crt subject invalid %v", icrt.Subject)
+	}
+}

mtls/options.go

@@ -0,0 +1,155 @@
+package mtls
+
+import (
+	"crypto/x509"
+	"math/big"
+	"time"
+)
+
+// CertificateOptions holds options for x509.CreateCertificate
+type CertificateOptions struct {
+	Organization          []string
+	OrganizationalUnit    []string
+	CommonName            string
+	OCSPServer            []string
+	IssuingCertificateURL []string
+	SerialNumber          *big.Int
+	NotAfter              time.Time
+	NotBefore             time.Time
+	SignatureAlgorithm    x509.SignatureAlgorithm
+	PublicKeyAlgorithm    x509.PublicKeyAlgorithm
+	ExtKeyUsage           []x509.ExtKeyUsage
+	KeyUsage              x509.KeyUsage
+	IsCA                  bool
+}
+
+// CertificateOrganizationalUnit set OrganizationalUnit in certificate subject
+func CertificateOrganizationalUnit(s ...string) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.OrganizationalUnit = s
+	}
+}
+
+// CertificateOrganization set Organization in certificate subject
+func CertificateOrganization(s ...string) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.Organization = s
+	}
+}
+
+// CertificateCommonName set CommonName in certificate subject
+func CertificateCommonName(s string) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.CommonName = s
+	}
+}
+
+// CertificateOCSPServer set OCSPServer in certificate
+func CertificateOCSPServer(s ...string) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.OCSPServer = s
+	}
+}
+
+// CertificateIssuingCertificateURL set IssuingCertificateURL in certificate
+func CertificateIssuingCertificateURL(s ...string) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.IssuingCertificateURL = s
+	}
+}
+
+// CertificateSerialNumber set SerialNumber in certificate
+func CertificateSerialNumber(n *big.Int) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.SerialNumber = n
+	}
+}
+
+// CertificateNotAfter set NotAfter in certificate
+func CertificateNotAfter(t time.Time) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.NotAfter = t
+	}
+}
+
+// CertificateNotBefore set SerialNumber in certificate
+func CertificateNotBefore(t time.Time) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.NotBefore = t
+	}
+}
+
+// CertificateExtKeyUsage set ExtKeyUsage in certificate
+func CertificateExtKeyUsage(x ...x509.ExtKeyUsage) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.ExtKeyUsage = x
+	}
+}
+
+// CertificateSignatureAlgorithm set SignatureAlgorithm in certificate
+func CertificateSignatureAlgorithm(alg x509.SignatureAlgorithm) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.SignatureAlgorithm = alg
+	}
+}
+
+// CertificatePublicKeyAlgorithm set PublicKeyAlgorithm in certificate
+func CertificatePublicKeyAlgorithm(alg x509.PublicKeyAlgorithm) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.PublicKeyAlgorithm = alg
+	}
+}
+
+// CertificateKeyUsage set KeyUsage in certificate
+func CertificateKeyUsage(u x509.KeyUsage) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.KeyUsage = u
+	}
+}
+
+// CertificateIsCA set IsCA in certificate
+func CertificateIsCA(b bool) CertificateOption {
+	return func(o *CertificateOptions) {
+		o.IsCA = b
+	}
+}
+
+// CertificateOption func signature
+type CertificateOption func(*CertificateOptions)
+
+func NewCertificateOptions(opts ...CertificateOption) CertificateOptions {
+	options := CertificateOptions{}
+	for _, o := range opts {
+		o(&options)
+	}
+	if options.SerialNumber == nil {
+		options.SerialNumber = big.NewInt(time.Now().UnixNano())
+	}
+	if options.NotBefore.IsZero() {
+		options.NotBefore = time.Now()
+	}
+	if options.NotAfter.IsZero() {
+		options.NotAfter = time.Now().Add(10 * time.Minute)
+	}
+	if options.SignatureAlgorithm == x509.UnknownSignatureAlgorithm {
+		options.SignatureAlgorithm = x509.PureEd25519
+	}
+	if options.PublicKeyAlgorithm == x509.UnknownPublicKeyAlgorithm {
+		options.PublicKeyAlgorithm = x509.Ed25519
+	}
+	if options.ExtKeyUsage == nil {
+		options.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth}
+		if options.IsCA {
+			options.ExtKeyUsage = append(options.ExtKeyUsage, x509.ExtKeyUsageOCSPSigning, x509.ExtKeyUsageTimeStamping)
+		}
+	}
+
+	if options.KeyUsage == 0 {
+		options.KeyUsage = x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature
+		if options.IsCA {
+			options.KeyUsage = x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageDataEncipherment | x509.KeyUsageCertSign
+		}
+	}
+
+	return options
+}

options.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"time"
 
-	"go.unistack.org/micro/v3/auth"
 	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/client"
 	"go.unistack.org/micro/v3/config"
@@ -39,8 +38,6 @@ type Options struct {
 	Configs []config.Config
 	// Clients holds clients
 	Clients []client.Client
-	// Auths holds auths
-	Auths []auth.Auth
 	// Stores holds stores
 	Stores []store.Store
 	// Registers holds registers
@@ -70,7 +67,6 @@ func NewOptions(opts ...Option) Options {
 		Brokers:   []broker.Broker{broker.DefaultBroker},
 		Registers: []register.Register{register.DefaultRegister},
 		Routers:   []router.Router{router.DefaultRouter},
-		Auths:     []auth.Auth{auth.DefaultAuth},
 		Loggers:   []logger.Logger{logger.DefaultLogger},
 		Tracers:   []tracer.Tracer{tracer.DefaultTracer},
 		Meters:    []meter.Meter{meter.DefaultMeter},
@@ -497,19 +493,6 @@ func TracerStore(n string) TracerOption {
 	}
 }
 
-/*
-// Auth sets the auth for the service
-func Auth(a auth.Auth) Option {
-	return func(o *Options) error {
-		o.Auth = a
-		if o.Server != nil {
-			o.Server.Init(server.Auth(a))
-		}
-		return nil
-	}
-}
-*/
-
 // Config sets the config for the service
 func Config(c ...config.Config) Option {
 	return func(o *Options) error {

profiler/pprof/pprof.go

@@ -49,12 +49,12 @@ func (p *profiler) Start() error {
 	// create exit channel
 	p.exit = make(chan bool)
 
-	cpuFile := filepath.Join("/tmp", "cpu.pprof")
-	memFile := filepath.Join("/tmp", "mem.pprof")
+	cpuFile := filepath.Join(string(os.PathSeparator)+"tmp", "cpu.pprof")
+	memFile := filepath.Join(string(os.PathSeparator)+"tmp", "mem.pprof")
 
 	if len(p.opts.Name) > 0 {
-		cpuFile = filepath.Join("/tmp", p.opts.Name+".cpu.pprof")
-		memFile = filepath.Join("/tmp", p.opts.Name+".mem.pprof")
+		cpuFile = filepath.Join(string(os.PathSeparator)+"tmp", p.opts.Name+".cpu.pprof")
+		memFile = filepath.Join(string(os.PathSeparator)+"tmp", p.opts.Name+".mem.pprof")
 	}
 
 	f1, err := os.Create(cpuFile)

register/context_test.go

@@ -0,0 +1,53 @@
+package register
+
+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, NewRegister())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("NewContext not works")
+	}
+}
+
+func TestFromContext(t *testing.T) {
+	ctx := context.WithValue(context.TODO(), registerKey{}, NewRegister())
+
+	c, ok := FromContext(ctx)
+	if c == nil || !ok {
+		t.Fatal("FromContext not works")
+	}
+}
+
+func TestNewContext(t *testing.T) {
+	ctx := NewContext(context.TODO(), NewRegister())
+
+	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")
+	}
+}

register/extractor_test.go

@@ -51,6 +51,4 @@ func TestExtractEndpoint(t *testing.T) {
 	if endpoints[0].Response != "TestResponse" {
 		t.Fatalf("Expected TestResponse got %s", endpoints[0].Response)
 	}
-
-	t.Logf("XXX %#+v\n", endpoints[0])
 }

register/memory.go

@@ -2,7 +2,6 @@ package register
 
 import (
 	"context"
-	"errors"
 	"sync"
 	"time"
 
@@ -30,10 +29,10 @@ type record struct {
 }
 
 type memory struct {
+	sync.RWMutex
 	records  map[string]services
 	watchers map[string]*watcher
 	opts     Options
-	sync.RWMutex
 }
 
 // services is a KV map with service name as the key and a map of records as the value
@@ -165,7 +164,7 @@ func (m *memory) Register(ctx context.Context, s *Service, opts ...RegisterOptio
 			continue
 		}
 
-		metadata := make(map[string]string)
+		metadata := make(map[string]string, len(n.Metadata))
 
 		// make copy of metadata
 		for k, v := range n.Metadata {
@@ -438,7 +437,7 @@ func (m *watcher) Next() (*Result, error) {
 				return r, nil
 			}
 		case <-m.exit:
-			return nil, errors.New("watcher stopped")
+			return nil, ErrWatcherStopped
 		}
 	}
 }

register/memory_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"sync"
 	"testing"
 	"time"
 )
@@ -284,29 +285,39 @@ func TestMemoryWildcard(t *testing.T) {
 }
 
 func TestWatcher(t *testing.T) {
-	w := &watcher{
-		id:   "test",
-		res:  make(chan *Result),
-		exit: make(chan bool),
-		wo: WatchOptions{
-			Domain: WildcardDomain,
-		},
-	}
+	testSrv := &Service{Name: "foo", Version: "1.0.0"}
 
+	ctx := context.TODO()
+	m := NewRegister()
+	m.Init()
+	m.Connect(ctx)
+	wc, err := m.Watch(ctx)
+	if err != nil {
+		t.Fatalf("cant watch: %v", err)
+	}
+	defer wc.Stop()
+
+	var wg sync.WaitGroup
+	wg.Add(1)
 	go func() {
-		w.res <- &Result{
-			Service: &Service{Name: "foo"},
+		for {
+			_, err := wc.Next()
+			if err != nil {
+				t.Fatal("unexpected err", err)
+			}
+			// t.Logf("changes %#+v", ch.Service)
+			wc.Stop()
+			wg.Done()
+			return
 		}
 	}()
 
-	_, err := w.Next()
-	if err != nil {
-		t.Fatal("unexpected err", err)
+	if err := m.Register(ctx, testSrv); err != nil {
+		t.Fatalf("Register err: %v", err)
 	}
 
-	w.Stop()
-
-	if _, err := w.Next(); err == nil {
+	wg.Wait()
+	if _, err := wc.Next(); err == nil {
 		t.Fatal("expected error on Next()")
 	}
 }

register/options.go

@@ -44,9 +44,8 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
-// nolint: golint,revive
 // RegisterOptions holds options for register method
-type RegisterOptions struct {
+type RegisterOptions struct { // nolint: golint,revive
 	Context  context.Context
 	Domain   string
 	TTL      time.Duration
@@ -197,33 +196,29 @@ func TLSConfig(t *tls.Config) Option {
 	}
 }
 
-// nolint: golint,revive
 // RegisterAttempts specifies register atempts count
-func RegisterAttempts(t int) RegisterOption {
+func RegisterAttempts(t int) RegisterOption { // nolint: golint,revive
 	return func(o *RegisterOptions) {
 		o.Attempts = t
 	}
 }
 
-// nolint: golint,revive
 // RegisterTTL specifies register ttl
-func RegisterTTL(t time.Duration) RegisterOption {
+func RegisterTTL(t time.Duration) RegisterOption { // nolint: golint,revive
 	return func(o *RegisterOptions) {
 		o.TTL = t
 	}
 }
 
-// nolint: golint,revive
 // RegisterContext sets the register context
-func RegisterContext(ctx context.Context) RegisterOption {
+func RegisterContext(ctx context.Context) RegisterOption { // nolint: golint,revive
 	return func(o *RegisterOptions) {
 		o.Context = ctx
 	}
 }
 
-// nolint: golint,revive
 // RegisterDomain secifies register domain
-func RegisterDomain(d string) RegisterOption {
+func RegisterDomain(d string) RegisterOption { // nolint: golint,revive
 	return func(o *RegisterOptions) {
 		o.Domain = d
 	}

register/register.go

@@ -11,13 +11,14 @@ import (
 const (
 	// WildcardDomain indicates any domain
 	WildcardDomain = "*"
-	// DefaultDomain to use if none was provided in options
-	DefaultDomain = "micro"
 )
 
+// DefaultDomain to use if none was provided in options
+var DefaultDomain = "micro"
+
 var (
 	// DefaultRegister is the global default register
-	DefaultRegister Register = NewRegister()
+	DefaultRegister = NewRegister()
 	// ErrNotFound returned when LookupService is called and no services found
 	ErrNotFound = errors.New("service not found")
 	// ErrWatcherStopped returned when when watcher is stopped
@@ -68,9 +69,8 @@ type Endpoint struct {
 // Option func signature
 type Option func(*Options)
 
-// nolint: golint,revive
 // RegisterOption option is used to register service
-type RegisterOption func(*RegisterOptions)
+type RegisterOption func(*RegisterOptions) // nolint: golint,revive
 
 // WatchOption option is used to watch service changes
 type WatchOption func(*WatchOptions)

resolver/dns/dns.go

@@ -12,10 +12,9 @@ import (
 
 // Resolver is a DNS network resolve
 type Resolver struct {
-	goresolver *net.Resolver
-	// Address of resolver to use
-	Address string
 	sync.RWMutex
+	goresolver *net.Resolver
+	Address    string
 }
 
 // Resolve tries to resolve endpoint address
@@ -47,7 +46,7 @@ func (r *Resolver) Resolve(name string) ([]*resolver.Record, error) {
 	if goresolver == nil {
 		r.Lock()
 		r.goresolver = &net.Resolver{
-			Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+			Dial: func(ctx context.Context, _ string, _ string) (net.Conn, error) {
 				d := net.Dialer{
 					Timeout: time.Millisecond * time.Duration(100),
 				}