util/reflect: update StructFieldNameByTag

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

.gitea/ISSUE_TEMPLATE/bug_report.md

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

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

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

.gitea/ISSUE_TEMPLATE/question.md

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

.gitea/autoapprove.yml

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

.gitea/workflows/lint.yml

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

.gitea/workflows/pr.yml

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

.github.old/PULL_REQUEST_TEMPLATE.md

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

.github.old/workflows/build.yml

@@ -34,7 +34,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v3.3.1
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

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

@@ -15,7 +15,7 @@ jobs:
     steps:
       - name: metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v1.3.5
+        uses: dependabot/fetch-metadata@v1.3.6
         with:
           github-token: "${{ secrets.TOKEN }}"
       - name: merge

.github.old/workflows/pr.yml

@@ -34,14 +34,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v3.3.1
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
-          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.30
-          # Optional: working directory, useful for monorepos
-          # working-directory: somedir
-          # Optional: golangci-lint command line arguments.
-          # args: --issues-exit-code=0
-          # Optional: show only new issues if it's a pull request. The default value is `false`.
-          # only-new-issues: true
+          version: v1.30

.gitignore

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

api/api.go

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

api/api_test.go

@@ -1,245 +0,0 @@
-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 TestEncode(t *testing.T) {
-	testData := []*Endpoint{
-		nil,
-		{
-			Name:        "Foo.Bar",
-			Description: "A test endpoint",
-			Handler:     "meta",
-			Host:        []string{"foo.com"},
-			Method:      []string{"GET"},
-			Path:        []string{"/test"},
-		},
-	}
-
-	compare := func(expect, got []string) bool {
-		// no data to compare, return true
-		if len(expect) == 0 && len(got) == 0 {
-			return true
-		}
-		// no data expected but got some return false
-		if len(expect) == 0 && len(got) > 0 {
-			return false
-		}
-
-		// compare expected with what we got
-		for _, e := range expect {
-			var seen bool
-			for _, g := range got {
-				if e == g {
-					seen = true
-					break
-				}
-			}
-			if !seen {
-				return false
-			}
-		}
-
-		// we're done, return true
-		return true
-	}
-
-	for _, d := range testData {
-		// encode
-		e := Encode(d)
-		// decode
-		de := Decode(e)
-
-		// nil endpoint returns nil
-		if d == nil {
-			if e != nil {
-				t.Fatalf("expected nil got %v", e)
-			}
-			if de != nil {
-				t.Fatalf("expected nil got %v", de)
-			}
-
-			continue
-		}
-
-		// check encoded map
-		name := e["endpoint"]
-		desc := e["description"]
-		method := strings.Split(e["method"], ",")
-		path := strings.Split(e["path"], ",")
-		host := strings.Split(e["host"], ",")
-		handler := e["handler"]
-
-		if name != d.Name {
-			t.Fatalf("expected %v got %v", d.Name, name)
-		}
-		if desc != d.Description {
-			t.Fatalf("expected %v got %v", d.Description, desc)
-		}
-		if handler != d.Handler {
-			t.Fatalf("expected %v got %v", d.Handler, handler)
-		}
-		if ok := compare(d.Method, method); !ok {
-			t.Fatalf("expected %v got %v", d.Method, method)
-		}
-		if ok := compare(d.Path, path); !ok {
-			t.Fatalf("expected %v got %v", d.Path, path)
-		}
-		if ok := compare(d.Host, host); !ok {
-			t.Fatalf("expected %v got %v", d.Host, host)
-		}
-
-		if de.Name != d.Name {
-			t.Fatalf("expected %v got %v", d.Name, de.Name)
-		}
-		if de.Description != d.Description {
-			t.Fatalf("expected %v got %v", d.Description, de.Description)
-		}
-		if de.Handler != d.Handler {
-			t.Fatalf("expected %v got %v", d.Handler, de.Handler)
-		}
-		if ok := compare(d.Method, de.Method); !ok {
-			t.Fatalf("expected %v got %v", d.Method, de.Method)
-		}
-		if ok := compare(d.Path, de.Path); !ok {
-			t.Fatalf("expected %v got %v", d.Path, de.Path)
-		}
-		if ok := compare(d.Host, de.Host); !ok {
-			t.Fatalf("expected %v got %v", d.Host, de.Host)
-		}
-	}
-}
-
-func TestValidate(t *testing.T) {
-	epPcre := &Endpoint{
-		Name:        "Foo.Bar",
-		Description: "A test endpoint",
-		Handler:     "meta",
-		Host:        []string{"foo.com"},
-		Method:      []string{"GET"},
-		Path:        []string{"^/test/?$"},
-	}
-	if err := Validate(epPcre); err != nil {
-		t.Fatal(err)
-	}
-
-	epGpath := &Endpoint{
-		Name:        "Foo.Bar",
-		Description: "A test endpoint",
-		Handler:     "meta",
-		Host:        []string{"foo.com"},
-		Method:      []string{"GET"},
-		Path:        []string{"/test/{id}"},
-	}
-	if err := Validate(epGpath); err != nil {
-		t.Fatal(err)
-	}
-
-	epPcreInvalid := &Endpoint{
-		Name:        "Foo.Bar",
-		Description: "A test endpoint",
-		Handler:     "meta",
-		Host:        []string{"foo.com"},
-		Method:      []string{"GET"},
-		Path:        []string{"/test/?$"},
-	}
-	if err := Validate(epPcreInvalid); err == nil {
-		t.Fatalf("invalid pcre %v", epPcreInvalid.Path[0])
-	}
-}
-
-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")
-	}
-}

broker/broker.go

@@ -4,18 +4,22 @@ package broker // import "go.unistack.org/micro/v3/broker"
 import (
 	"context"
 	"errors"
+	"time"
 
+	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/metadata"
 )
 
 // DefaultBroker default memory broker
-var DefaultBroker = NewBroker()
+var DefaultBroker Broker = NewBroker()
 
 var (
 	// ErrNotConnected returns when broker used but not connected yet
 	ErrNotConnected = errors.New("broker not connected")
 	// ErrDisconnected returns when broker disconnected
 	ErrDisconnected = errors.New("broker disconnected")
+	// DefaultGracefulTimeout
+	DefaultGracefulTimeout = 5 * time.Second
 )
 
 // Broker is an interface used for asynchronous messaging.
@@ -44,6 +48,17 @@ type Broker interface {
 	String() string
 }
 
+type (
+	FuncPublish        func(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error
+	HookPublish        func(next FuncPublish) FuncPublish
+	FuncBatchPublish   func(ctx context.Context, msgs []*Message, opts ...PublishOption) error
+	HookBatchPublish   func(next FuncBatchPublish) FuncBatchPublish
+	FuncSubscribe      func(ctx context.Context, topic string, h Handler, opts ...SubscribeOption) (Subscriber, error)
+	HookSubscribe      func(next FuncSubscribe) FuncSubscribe
+	FuncBatchSubscribe func(ctx context.Context, topic string, h BatchHandler, opts ...SubscribeOption) (Subscriber, error)
+	HookBatchSubscribe func(next FuncBatchSubscribe) FuncBatchSubscribe
+)
+
 // Handler is used to process messages via a subscription of a topic.
 type Handler func(Event) error
 
@@ -85,33 +100,12 @@ type Event interface {
 	SetError(err error)
 }
 
-// RawMessage is a raw encoded JSON value.
-// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
-type RawMessage []byte
-
-// MarshalJSON returns m as the JSON encoding of m.
-func (m *RawMessage) MarshalJSON() ([]byte, error) {
-	if m == nil {
-		return []byte("null"), nil
-	}
-	return *m, nil
-}
-
-// UnmarshalJSON sets *m to a copy of data.
-func (m *RawMessage) UnmarshalJSON(data []byte) error {
-	if m == nil {
-		return errors.New("RawMessage UnmarshalJSON on nil pointer")
-	}
-	*m = append((*m)[0:0], data...)
-	return nil
-}
-
 // Message is used to transfer data
 type Message struct {
 	// Header contains message metadata
 	Header metadata.Metadata
 	// Body contains message body
-	Body RawMessage
+	Body codec.RawMessage
 }
 
 // NewMessage create broker message with topic filled

broker/memory/memory.go

@@ -4,8 +4,10 @@ import (
 	"context"
 	"sync"
 
+	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/logger"
 	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v3/options"
 	maddr "go.unistack.org/micro/v3/util/addr"
 	"go.unistack.org/micro/v3/util/id"
 	mnet "go.unistack.org/micro/v3/util/net"
@@ -13,9 +15,13 @@ import (
 )
 
 type memoryBroker struct {
-	subscribers map[string][]*memorySubscriber
-	addr        string
-	opts        Options
+	funcPublish        broker.FuncPublish
+	funcBatchPublish   broker.FuncBatchPublish
+	funcSubscribe      broker.FuncSubscribe
+	funcBatchSubscribe broker.FuncBatchSubscribe
+	subscribers        map[string][]*memorySubscriber
+	addr               string
+	opts               broker.Options
 	sync.RWMutex
 	connected bool
 }
@@ -24,20 +30,20 @@ type memoryEvent struct {
 	err     error
 	message interface{}
 	topic   string
-	opts    Options
+	opts    broker.Options
 }
 
 type memorySubscriber struct {
 	ctx          context.Context
 	exit         chan bool
-	handler      Handler
-	batchhandler BatchHandler
+	handler      broker.Handler
+	batchhandler broker.BatchHandler
 	id           string
 	topic        string
-	opts         SubscribeOptions
+	opts         broker.SubscribeOptions
 }
 
-func (m *memoryBroker) Options() Options {
+func (m *memoryBroker) Options() broker.Options {
 	return m.opts
 }
 
@@ -46,6 +52,12 @@ func (m *memoryBroker) Address() string {
 }
 
 func (m *memoryBroker) Connect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+
 	m.Lock()
 	defer m.Unlock()
 
@@ -70,6 +82,12 @@ func (m *memoryBroker) Connect(ctx context.Context) error {
 }
 
 func (m *memoryBroker) Disconnect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+
 	m.Lock()
 	defer m.Unlock()
 
@@ -81,27 +99,54 @@ func (m *memoryBroker) Disconnect(ctx context.Context) error {
 	return nil
 }
 
-func (m *memoryBroker) Init(opts ...Option) error {
+func (m *memoryBroker) Init(opts ...broker.Option) error {
 	for _, o := range opts {
 		o(&m.opts)
 	}
+
+	m.funcPublish = m.fnPublish
+	m.funcBatchPublish = m.fnBatchPublish
+	m.funcSubscribe = m.fnSubscribe
+	m.funcBatchSubscribe = m.fnBatchSubscribe
+
+	m.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case broker.HookPublish:
+			m.funcPublish = h(m.funcPublish)
+		case broker.HookBatchPublish:
+			m.funcBatchPublish = h(m.funcBatchPublish)
+		case broker.HookSubscribe:
+			m.funcSubscribe = h(m.funcSubscribe)
+		case broker.HookBatchSubscribe:
+			m.funcBatchSubscribe = h(m.funcBatchSubscribe)
+		}
+	})
+
 	return nil
 }
 
-func (m *memoryBroker) Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error {
-	msg.Header.Set(metadata.HeaderTopic, topic)
-	return m.publish(ctx, []*Message{msg}, opts...)
+func (m *memoryBroker) Publish(ctx context.Context, topic string, msg *broker.Message, opts ...broker.PublishOption) error {
+	return m.funcPublish(ctx, topic, msg, opts...)
 }
 
-func (m *memoryBroker) BatchPublish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
+func (m *memoryBroker) fnPublish(ctx context.Context, topic string, msg *broker.Message, opts ...broker.PublishOption) error {
+	msg.Header.Set(metadata.HeaderTopic, topic)
+	return m.publish(ctx, []*broker.Message{msg}, opts...)
+}
+
+func (m *memoryBroker) BatchPublish(ctx context.Context, msgs []*broker.Message, opts ...broker.PublishOption) error {
+	return m.funcBatchPublish(ctx, msgs, opts...)
+}
+
+func (m *memoryBroker) fnBatchPublish(ctx context.Context, msgs []*broker.Message, opts ...broker.PublishOption) error {
 	return m.publish(ctx, msgs, opts...)
 }
 
-func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
+func (m *memoryBroker) publish(ctx context.Context, msgs []*broker.Message, opts ...broker.PublishOption) error {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
-		return ErrNotConnected
+		return broker.ErrNotConnected
 	}
 	m.RUnlock()
 
@@ -111,9 +156,9 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 	case <-ctx.Done():
 		return ctx.Err()
 	default:
-		options := NewPublishOptions(opts...)
+		options := broker.NewPublishOptions(opts...)
 
-		msgTopicMap := make(map[string]Events)
+		msgTopicMap := make(map[string]broker.Events)
 		for _, v := range msgs {
 			p := &memoryEvent{opts: m.opts}
 
@@ -188,11 +233,15 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 	return nil
 }
 
-func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler BatchHandler, opts ...SubscribeOption) (Subscriber, error) {
+func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler broker.BatchHandler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
+	return m.funcBatchSubscribe(ctx, topic, handler, opts...)
+}
+
+func (m *memoryBroker) fnBatchSubscribe(ctx context.Context, topic string, handler broker.BatchHandler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
-		return nil, ErrNotConnected
+		return nil, broker.ErrNotConnected
 	}
 	m.RUnlock()
 
@@ -201,7 +250,7 @@ func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler
 		return nil, err
 	}
 
-	options := NewSubscribeOptions(opts...)
+	options := broker.NewSubscribeOptions(opts...)
 
 	sub := &memorySubscriber{
 		exit:         make(chan bool, 1),
@@ -233,11 +282,15 @@ func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler
 	return sub, nil
 }
 
-func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
+func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
+	return m.funcSubscribe(ctx, topic, handler, opts...)
+}
+
+func (m *memoryBroker) fnSubscribe(ctx context.Context, topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
-		return nil, ErrNotConnected
+		return nil, broker.ErrNotConnected
 	}
 	m.RUnlock()
 
@@ -246,7 +299,7 @@ func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Hand
 		return nil, err
 	}
 
-	options := NewSubscribeOptions(opts...)
+	options := broker.NewSubscribeOptions(opts...)
 
 	sub := &memorySubscriber{
 		exit:    make(chan bool, 1),
@@ -290,12 +343,12 @@ func (m *memoryEvent) Topic() string {
 	return m.topic
 }
 
-func (m *memoryEvent) Message() *Message {
+func (m *memoryEvent) Message() *broker.Message {
 	switch v := m.message.(type) {
-	case *Message:
+	case *broker.Message:
 		return v
 	case []byte:
-		msg := &Message{}
+		msg := &broker.Message{}
 		if err := m.opts.Codec.Unmarshal(v, msg); err != nil {
 			if m.opts.Logger.V(logger.ErrorLevel) {
 				m.opts.Logger.Error(m.opts.Context, "[memory]: failed to unmarshal: %v", err)
@@ -320,7 +373,7 @@ func (m *memoryEvent) SetError(err error) {
 	m.err = err
 }
 
-func (m *memorySubscriber) Options() SubscribeOptions {
+func (m *memorySubscriber) Options() broker.SubscribeOptions {
 	return m.opts
 }
 
@@ -334,9 +387,9 @@ func (m *memorySubscriber) Unsubscribe(ctx context.Context) error {
 }
 
 // NewBroker return new memory broker
-func NewBroker(opts ...Option) Broker {
+func NewBroker(opts ...broker.Option) broker.Broker {
 	return &memoryBroker{
-		opts:        NewOptions(opts...),
+		opts:        broker.NewOptions(opts...),
 		subscribers: make(map[string][]*memorySubscriber),
 	}
 }

broker/memory/memory_test.go

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

broker/noop.go

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

broker/noop_test.go

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

broker/options.go

@@ -8,7 +8,9 @@ import (
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/logger"
 	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/register"
+	"go.unistack.org/micro/v3/sync"
 	"go.unistack.org/micro/v3/tracer"
 )
 
@@ -36,17 +38,25 @@ type Options struct {
 	Name string
 	// Addrs holds the broker address
 	Addrs []string
+	// Wait waits for a collection of goroutines to finish
+	Wait *sync.WaitGroup
+	// GracefulTimeout contains time to wait to finish in flight requests
+	GracefulTimeout time.Duration
+	// Hooks can be run before broker Publish/BatchPublish and
+	// Subscribe/BatchSubscribe methods
+	Hooks options.Hooks
 }
 
 // NewOptions create new Options
 func NewOptions(opts ...Option) Options {
 	options := Options{
-		Register: register.DefaultRegister,
-		Logger:   logger.DefaultLogger,
-		Context:  context.Background(),
-		Meter:    meter.DefaultMeter,
-		Codec:    codec.DefaultCodec,
-		Tracer:   tracer.DefaultTracer,
+		Register:        register.DefaultRegister,
+		Logger:          logger.DefaultLogger,
+		Context:         context.Background(),
+		Meter:           meter.DefaultMeter,
+		Codec:           codec.DefaultCodec,
+		Tracer:          tracer.DefaultTracer,
+		GracefulTimeout: DefaultGracefulTimeout,
 	}
 	for _, o := range opts {
 		o(&options)
@@ -224,6 +234,13 @@ func Name(n string) Option {
 	}
 }
 
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
+	return func(o *Options) {
+		o.Hooks = append(o.Hooks, h...)
+	}
+}
+
 // SubscribeContext set context
 func SubscribeContext(ctx context.Context) SubscribeOption {
 	return func(o *SubscribeOptions) {

client/client.go

@@ -13,7 +13,7 @@ var (
 	// DefaultClient is the global default client
 	DefaultClient = NewClient()
 	// DefaultContentType is the default content-type if not specified
-	DefaultContentType = "application/json"
+	DefaultContentType = ""
 	// 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
@@ -44,6 +44,17 @@ type Client interface {
 	String() string
 }
 
+type (
+	FuncCall         func(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
+	HookCall         func(next FuncCall) FuncCall
+	FuncStream       func(ctx context.Context, req Request, opts ...CallOption) (Stream, error)
+	HookStream       func(next FuncStream) FuncStream
+	FuncPublish      func(ctx context.Context, msg Message, opts ...PublishOption) error
+	HookPublish      func(next FuncPublish) FuncPublish
+	FuncBatchPublish func(ctx context.Context, msg []Message, opts ...PublishOption) error
+	HookBatchPublish func(next FuncBatchPublish) FuncBatchPublish
+)
+
 // Message is the interface for publishing asynchronously
 type Message interface {
 	Topic() string

client/client_call_options_test.go

@@ -1,26 +0,0 @@
-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/noop.go

@@ -3,13 +3,18 @@ package client
 import (
 	"context"
 	"fmt"
+	"os"
+	"strconv"
 	"time"
 
 	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/errors"
 	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/selector"
+	"go.unistack.org/micro/v3/semconv"
+	"go.unistack.org/micro/v3/tracer"
 )
 
 // DefaultCodecs will be used to encode/decode data
@@ -18,7 +23,11 @@ var DefaultCodecs = map[string]codec.Codec{
 }
 
 type noopClient struct {
-	opts Options
+	funcPublish      FuncPublish
+	funcBatchPublish FuncBatchPublish
+	funcCall         FuncCall
+	funcStream       FuncStream
+	opts             Options
 }
 
 type noopMessage struct {
@@ -39,16 +48,14 @@ type noopRequest struct {
 
 // NewClient returns new noop client
 func NewClient(opts ...Option) Client {
-	nc := &noopClient{opts: NewOptions(opts...)}
-	// wrap in reverse
+	n := &noopClient{opts: NewOptions(opts...)}
 
-	c := Client(nc)
+	n.funcCall = n.fnCall
+	n.funcStream = n.fnStream
+	n.funcPublish = n.fnPublish
+	n.funcBatchPublish = n.fnBatchPublish
 
-	for i := len(nc.opts.Wrappers); i > 0; i-- {
-		c = nc.opts.Wrappers[i-1](c)
-	}
-
-	return c
+	return n
 }
 
 func (n *noopClient) Name() string {
@@ -100,10 +107,13 @@ func (n *noopResponse) Read() ([]byte, error) {
 	return nil, nil
 }
 
-type noopStream struct{}
+type noopStream struct {
+	err error
+	ctx context.Context
+}
 
 func (n *noopStream) Context() context.Context {
-	return context.Background()
+	return n.ctx
 }
 
 func (n *noopStream) Request() Request {
@@ -131,15 +141,21 @@ func (n *noopStream) RecvMsg(interface{}) error {
 }
 
 func (n *noopStream) Error() error {
-	return nil
+	return n.err
 }
 
 func (n *noopStream) Close() error {
-	return nil
+	if sp, ok := tracer.SpanFromContext(n.ctx); ok && sp != nil {
+		if n.err != nil {
+			sp.SetStatus(tracer.SpanStatusError, n.err.Error())
+		}
+		sp.Finish()
+	}
+	return n.err
 }
 
 func (n *noopStream) CloseSend() error {
-	return nil
+	return n.err
 }
 
 func (n *noopMessage) Topic() string {
@@ -172,6 +188,25 @@ func (n *noopClient) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&n.opts)
 	}
+
+	n.funcCall = n.fnCall
+	n.funcStream = n.fnStream
+	n.funcPublish = n.fnPublish
+	n.funcBatchPublish = n.fnBatchPublish
+
+	n.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case HookCall:
+			n.funcCall = h(n.funcCall)
+		case HookStream:
+			n.funcStream = h(n.funcStream)
+		case HookPublish:
+			n.funcPublish = h(n.funcPublish)
+		case HookBatchPublish:
+			n.funcBatchPublish = h(n.funcBatchPublish)
+		}
+	})
+
 	return nil
 }
 
@@ -184,6 +219,31 @@ func (n *noopClient) String() string {
 }
 
 func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
+	ts := time.Now()
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = n.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	err := n.funcCall(ctx, req, rsp, opts...)
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	n.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	n.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return err
+}
+
+func (n *noopClient) fnCall(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
 	// make a copy of call opts
 	callOpts := n.opts.CallOptions
 	for _, opt := range opts {
@@ -212,11 +272,8 @@ func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opt
 	}
 
 	// 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)
+	hcall := func(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error {
+		return nil
 	}
 
 	// use the router passed as a call option, or fallback to the rpc clients router
@@ -315,10 +372,6 @@ func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opt
 	return gerr
 }
 
-func (n *noopClient) call(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error {
-	return nil
-}
-
 func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts ...RequestOption) Request {
 	return &noopRequest{service: service, endpoint: endpoint}
 }
@@ -329,6 +382,31 @@ func (n *noopClient) NewMessage(topic string, msg interface{}, opts ...MessageOp
 }
 
 func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
+	ts := time.Now()
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = n.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	stream, err := n.funcStream(ctx, req, opts...)
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	n.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	n.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return stream, err
+}
+
+func (n *noopClient) fnStream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
 	var err error
 
 	// make a copy of call opts
@@ -469,14 +547,22 @@ func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption
 }
 
 func (n *noopClient) stream(ctx context.Context, addr string, req Request, opts CallOptions) (Stream, error) {
-	return &noopStream{}, nil
+	return &noopStream{ctx: ctx}, nil
 }
 
 func (n *noopClient) BatchPublish(ctx context.Context, ps []Message, opts ...PublishOption) error {
+	return n.funcBatchPublish(ctx, ps, opts...)
+}
+
+func (n *noopClient) fnBatchPublish(ctx context.Context, ps []Message, opts ...PublishOption) error {
 	return n.publish(ctx, ps, opts...)
 }
 
 func (n *noopClient) Publish(ctx context.Context, p Message, opts ...PublishOption) error {
+	return n.funcPublish(ctx, p, opts...)
+}
+
+func (n *noopClient) fnPublish(ctx context.Context, p Message, opts ...PublishOption) error {
 	return n.publish(ctx, []Message{p}, opts...)
 }
 
@@ -485,21 +571,34 @@ func (n *noopClient) publish(ctx context.Context, ps []Message, opts ...PublishO
 
 	msgs := make([]*broker.Message, 0, len(ps))
 
+	// get proxy
+	exchange := ""
+	if v, ok := os.LookupEnv("MICRO_PROXY"); ok {
+		exchange = v
+	}
+	// get the exchange
+	if len(options.Exchange) > 0 {
+		exchange = options.Exchange
+	}
+
+	omd, ok := metadata.FromOutgoingContext(ctx)
+	if !ok {
+		omd = metadata.New(0)
+	}
+
 	for _, p := range ps {
-		md, ok := metadata.FromOutgoingContext(ctx)
-		if !ok {
-			md = metadata.New(0)
-		}
+		md := metadata.Copy(omd)
 		md[metadata.HeaderContentType] = p.ContentType()
-
 		topic := p.Topic()
-
-		// get the exchange
-		if len(options.Exchange) > 0 {
-			topic = options.Exchange
+		if len(exchange) > 0 {
+			topic = exchange
 		}
-
 		md[metadata.HeaderTopic] = topic
+		iter := p.Metadata().Iterator()
+		var k, v string
+		for iter.Next(&k, &v) {
+			md.Set(k, v)
+		}
 
 		var body []byte
 
@@ -524,6 +623,13 @@ func (n *noopClient) publish(ctx context.Context, ps []Message, opts ...PublishO
 		msgs = append(msgs, &broker.Message{Header: md, Body: body})
 	}
 
+	if len(msgs) == 1 {
+		return n.opts.Broker.Publish(ctx, msgs[0].Header[metadata.HeaderTopic], msgs[0],
+			broker.PublishContext(options.Context),
+			broker.PublishBodyOnly(options.BodyOnly),
+		)
+	}
+
 	return n.opts.Broker.BatchPublish(ctx, msgs,
 		broker.PublishContext(options.Context),
 		broker.PublishBodyOnly(options.BodyOnly),

client/noop_test.go

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

client/options.go

@@ -12,6 +12,7 @@ import (
 	"go.unistack.org/micro/v3/metadata"
 	"go.unistack.org/micro/v3/meter"
 	"go.unistack.org/micro/v3/network/transport"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/register"
 	"go.unistack.org/micro/v3/router"
 	"go.unistack.org/micro/v3/selector"
@@ -59,6 +60,9 @@ type Options struct {
 	PoolTTL time.Duration
 	// ContextDialer used to connect
 	ContextDialer func(context.Context, string) (net.Conn, error)
+	// Hooks can be run before broker Publish/BatchPublish and
+	// Subscribe/BatchSubscribe methods
+	Hooks options.Hooks
 }
 
 // NewCallOptions creates new call options struct
@@ -92,8 +96,6 @@ type CallOptions struct {
 	Address []string
 	// SelectOptions selector options
 	SelectOptions []selector.SelectOption
-	// CallWrappers call wrappers
-	CallWrappers []CallWrapper
 	// StreamTimeout stream timeout
 	StreamTimeout time.Duration
 	// RequestTimeout request timeout
@@ -185,7 +187,7 @@ func NewOptions(opts ...Option) Options {
 	options := Options{
 		Context:     context.Background(),
 		ContentType: DefaultContentType,
-		Codecs:      make(map[string]codec.Codec),
+		Codecs:      DefaultCodecs,
 		CallOptions: CallOptions{
 			Context:        context.Background(),
 			Backoff:        DefaultBackoff,
@@ -306,20 +308,6 @@ func Selector(s selector.Selector) Option {
 	}
 }
 
-// Wrap adds a wrapper to the list of options passed into the client
-func Wrap(w Wrapper) Option {
-	return func(o *Options) {
-		o.Wrappers = append(o.Wrappers, w)
-	}
-}
-
-// WrapCall adds a wrapper to the list of CallFunc wrappers
-func WrapCall(cw ...CallWrapper) Option {
-	return func(o *Options) {
-		o.CallOptions.CallWrappers = append(o.CallOptions.CallWrappers, cw...)
-	}
-}
-
 // Backoff is used to set the backoff function used when retrying Calls
 func Backoff(fn BackoffFunc) Option {
 	return func(o *Options) {
@@ -450,13 +438,6 @@ func WithAddress(a ...string) CallOption {
 	}
 }
 
-// WithCallWrapper is a CallOption which adds to the existing CallFunc wrappers
-func WithCallWrapper(cw ...CallWrapper) CallOption {
-	return func(o *CallOptions) {
-		o.CallWrappers = append(o.CallWrappers, cw...)
-	}
-}
-
 // WithBackoff is a CallOption which overrides that which
 // set in Options.CallOptions
 func WithBackoff(fn BackoffFunc) CallOption {
@@ -591,3 +572,10 @@ func RequestContentType(ct string) RequestOption {
 		o.ContentType = ct
 	}
 }
+
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
+	return func(o *Options) {
+		o.Hooks = append(o.Hooks, h...)
+	}
+}

cluster/cluster.go

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

codec/codec.go

@@ -84,3 +84,24 @@ func MarshalAppend(buf []byte, c Codec, v interface{}, opts ...Option) ([]byte,
 
 	return append(buf, mbuf...), nil
 }
+
+// RawMessage is a raw encoded JSON value.
+// It implements Marshaler and Unmarshaler and can be used to delay decoding or precompute a encoding.
+type RawMessage []byte
+
+// MarshalJSON returns m as the JSON encoding of m.
+func (m *RawMessage) MarshalJSON() ([]byte, error) {
+	if m == nil {
+		return []byte("null"), nil
+	}
+	return *m, nil
+}
+
+// UnmarshalJSON sets *m to a copy of data.
+func (m *RawMessage) UnmarshalJSON(data []byte) error {
+	if m == nil {
+		return errors.New("RawMessage UnmarshalJSON on nil pointer")
+	}
+	*m = append((*m)[0:0], data...)
+	return nil
+}

config/config.go

@@ -13,7 +13,7 @@ type Validator interface {
 }
 
 // DefaultConfig default config
-var DefaultConfig = NewConfig()
+var DefaultConfig Config = NewConfig()
 
 // DefaultWatcherMinInterval default min interval for poll changes
 var DefaultWatcherMinInterval = 5 * time.Second
@@ -50,6 +50,13 @@ type Config interface {
 	String() string
 }
 
+type (
+	FuncLoad func(ctx context.Context, opts ...LoadOption) error
+	HookLoad func(next FuncLoad) FuncLoad
+	FuncSave func(ctx context.Context, opts ...SaveOption) error
+	HookSave func(next FuncSave) FuncSave
+)
+
 // Watcher is the config watcher
 type Watcher interface {
 	// Next blocks until update happens or error returned
@@ -124,33 +131,12 @@ func Validate(ctx context.Context, cfg interface{}) error {
 }
 
 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 {
-				c.Options().Logger.Errorf(ctx, "%s AfterLoad err: %v", c.String(), err)
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-	// DefaultAfterSave default func that runs after config save
-	DefaultAfterSave = func(ctx context.Context, c Config) error {
-		for _, fn := range c.Options().AfterSave {
-			if err := fn(ctx, c); err != nil {
-				c.Options().Logger.Errorf(ctx, "%s AfterSave err: %v", c.String(), err)
-				if !c.Options().AllowFail {
-					return err
-				}
-			}
-		}
-		return nil
-	}
-	// DefaultBeforeLoad default func that runs before config load
+	// DefaultBeforeLoad default func that runs before config Load
 	DefaultBeforeLoad = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().BeforeLoad {
+			if fn == nil {
+				return nil
+			}
 			if err := fn(ctx, c); err != nil {
 				c.Options().Logger.Errorf(ctx, "%s BeforeLoad err: %v", c.String(), err)
 				if !c.Options().AllowFail {
@@ -160,9 +146,27 @@ var (
 		}
 		return nil
 	}
-	// DefaultBeforeSave default func that runs befora config save
+	// DefaultAfterLoad default func that runs after config Load
+	DefaultAfterLoad = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().AfterLoad {
+			if fn == nil {
+				return nil
+			}
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Errorf(ctx, "%s AfterLoad err: %v", c.String(), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+	// DefaultBeforeSave default func that runs befora config Save
 	DefaultBeforeSave = func(ctx context.Context, c Config) error {
 		for _, fn := range c.Options().BeforeSave {
+			if fn == nil {
+				return nil
+			}
 			if err := fn(ctx, c); err != nil {
 				c.Options().Logger.Errorf(ctx, "%s BeforeSave err: %v", c.String(), err)
 				if !c.Options().AllowFail {
@@ -172,4 +176,49 @@ 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 fn == nil {
+				return nil
+			}
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Errorf(ctx, "%s AfterSave err: %v", c.String(), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+	// DefaultBeforeInit default func that runs befora config Init
+	DefaultBeforeInit = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().BeforeInit {
+			if fn == nil {
+				return nil
+			}
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Errorf(ctx, "%s BeforeInit err: %v", c.String(), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
+	// DefaultAfterInit default func that runs after config Init
+	DefaultAfterInit = func(ctx context.Context, c Config) error {
+		for _, fn := range c.Options().AfterSave {
+			if fn == nil {
+				return nil
+			}
+			if err := fn(ctx, c); err != nil {
+				c.Options().Logger.Errorf(ctx, "%s AfterInit err: %v", c.String(), err)
+				if !c.Options().AllowFail {
+					return err
+				}
+			}
+		}
+		return nil
+	}
 )

config/default.go

@@ -5,13 +5,20 @@ import (
 	"reflect"
 	"strconv"
 	"strings"
+	"time"
 
-	"github.com/imdario/mergo"
+	"dario.cat/mergo"
+	"github.com/google/uuid"
+	"go.unistack.org/micro/v3/options"
+	mid "go.unistack.org/micro/v3/util/id"
 	rutil "go.unistack.org/micro/v3/util/reflect"
+	mtime "go.unistack.org/micro/v3/util/time"
 )
 
 type defaultConfig struct {
-	opts Options
+	funcLoad FuncLoad
+	funcSave FuncSave
+	opts     Options
 }
 
 func (c *defaultConfig) Options() Options {
@@ -22,11 +29,42 @@ func (c *defaultConfig) Init(opts ...Option) error {
 	for _, o := range opts {
 		o(&c.opts)
 	}
+
+	if err := DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
+	c.funcLoad = c.fnLoad
+	c.funcSave = c.fnSave
+
+	c.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case HookLoad:
+			c.funcLoad = h(c.funcLoad)
+		case HookSave:
+			c.funcSave = h(c.funcSave)
+		}
+	})
+
+	if err := DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
+		return err
+	}
+
 	return nil
 }
 
 func (c *defaultConfig) Load(ctx context.Context, opts ...LoadOption) error {
-	if err := DefaultBeforeLoad(ctx, c); err != nil {
+	return c.funcLoad(ctx, opts...)
+}
+
+func (c *defaultConfig) fnLoad(ctx context.Context, opts ...LoadOption) error {
+	var err error
+
+	if c.opts.SkipLoad != nil && c.opts.SkipLoad(ctx, c) {
+		return nil
+	}
+
+	if err = DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
@@ -49,21 +87,20 @@ func (c *defaultConfig) Load(ctx context.Context, opts ...LoadOption) error {
 		if !c.opts.AllowFail {
 			return err
 		}
-		return DefaultAfterLoad(ctx, c)
+		if err = DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
+			return err
+		}
 	}
 
 	if err = fillValues(reflect.ValueOf(src), c.opts.StructTag); err == nil {
 		err = mergo.Merge(dst, src, mopts...)
 	}
 
-	if err != nil {
-		c.opts.Logger.Errorf(ctx, "default load error: %v", err)
-		if !c.opts.AllowFail {
-			return err
-		}
+	if err != nil && !c.opts.AllowFail {
+		return err
 	}
 
-	if err := DefaultAfterLoad(ctx, c); err != nil {
+	if err := DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
 
@@ -75,6 +112,7 @@ func fillValue(value reflect.Value, val string) error {
 	if !rutil.IsEmpty(value) {
 		return nil
 	}
+
 	switch value.Kind() {
 	case reflect.Map:
 		t := value.Type()
@@ -113,6 +151,20 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(v))
 	case reflect.String:
+		switch val {
+		case "micro:generate uuid":
+			uid, err := uuid.NewRandom()
+			if err != nil {
+				return err
+			}
+			val = uid.String()
+		case "micro:generate id":
+			uid, err := mid.New()
+			if err != nil {
+				return err
+			}
+			val = uid
+		}
 		value.Set(reflect.ValueOf(val))
 	case reflect.Float32:
 		v, err := strconv.ParseFloat(val, 32)
@@ -151,11 +203,26 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(int32(v)))
 	case reflect.Int64:
-		v, err := strconv.ParseInt(val, 10, 64)
-		if err != nil {
-			return err
+		switch {
+		case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "time":
+			v, err := time.ParseDuration(val)
+			if err != nil {
+				return err
+			}
+			value.Set(reflect.ValueOf(v))
+		case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "go.unistack.org/micro/v3/util/time":
+			v, err := mtime.ParseDuration(val)
+			if err != nil {
+				return err
+			}
+			value.SetInt(int64(v))
+		default:
+			v, err := strconv.ParseInt(val, 10, 64)
+			if err != nil {
+				return err
+			}
+			value.Set(reflect.ValueOf(v))
 		}
-		value.Set(reflect.ValueOf(v))
 	case reflect.Uint:
 		v, err := strconv.ParseUint(val, 10, 0)
 		if err != nil {
@@ -187,6 +254,7 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(v))
 	}
+
 	return nil
 }
 
@@ -250,6 +318,14 @@ func fillValues(valueOf reflect.Value, tname string) error {
 }
 
 func (c *defaultConfig) Save(ctx context.Context, opts ...SaveOption) error {
+	return c.funcSave(ctx, opts...)
+}
+
+func (c *defaultConfig) fnSave(ctx context.Context, opts ...SaveOption) error {
+	if c.opts.SkipSave != nil && c.opts.SkipSave(ctx, c) {
+		return nil
+	}
+
 	if err := DefaultBeforeSave(ctx, c); err != nil {
 		return err
 	}
@@ -269,7 +345,7 @@ func (c *defaultConfig) Name() string {
 	return c.opts.Name
 }
 
-func (c *defaultConfig) Watch(ctx context.Context, opts ...WatchOption) (Watcher, error) {
+func (c *defaultConfig) Watch(_ context.Context, _ ...WatchOption) (Watcher, error) {
 	return nil, ErrWatcherNotImplemented
 }
 
@@ -279,5 +355,9 @@ func NewConfig(opts ...Option) Config {
 	if len(options.StructTag) == 0 {
 		options.StructTag = "default"
 	}
-	return &defaultConfig{opts: options}
+	c := &defaultConfig{opts: options}
+	c.funcLoad = c.fnLoad
+	c.funcSave = c.fnSave
+
+	return c
 }

config/default_test.go

@@ -4,15 +4,23 @@ import (
 	"context"
 	"fmt"
 	"testing"
+	"time"
 
 	"go.unistack.org/micro/v3/config"
+	mid "go.unistack.org/micro/v3/util/id"
+	mtime "go.unistack.org/micro/v3/util/time"
 )
 
 type cfg struct {
-	StringValue string `default:"string_value"`
-	IgnoreValue string `json:"-"`
-	StructValue *cfgStructValue
-	IntValue    int `default:"99"`
+	StringValue    string `default:"string_value"`
+	IgnoreValue    string `json:"-"`
+	StructValue    *cfgStructValue
+	IntValue       int             `default:"99"`
+	DurationValue  time.Duration   `default:"10s"`
+	MDurationValue mtime.Duration  `default:"10s"`
+	MapValue       map[string]bool `default:"key1=true,key2=false"`
+	UUIDValue      string          `default:"micro:generate uuid"`
+	IDValue        string          `default:"micro:generate id"`
 }
 
 type cfgStructValue struct {
@@ -33,6 +41,35 @@ func (c *cfgStructValue) Validate() error {
 	return nil
 }
 
+type testHook struct {
+	f bool
+}
+
+func (t *testHook) Load(fn config.FuncLoad) config.FuncLoad {
+	return func(ctx context.Context, opts ...config.LoadOption) error {
+		t.f = true
+		return fn(ctx, opts...)
+	}
+}
+
+func TestHook(t *testing.T) {
+	h := &testHook{}
+
+	c := config.NewConfig(config.Struct(h), config.Hooks(config.HookLoad(h.Load)))
+
+	if err := c.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := c.Load(context.TODO()); err != nil {
+		t.Fatal(err)
+	}
+
+	if !h.f {
+		t.Fatal("hook not works")
+	}
+}
+
 func TestDefault(t *testing.T) {
 	ctx := context.Background()
 	conf := &cfg{IntValue: 10}
@@ -63,6 +100,21 @@ func TestDefault(t *testing.T) {
 	if conf.StringValue != "after_load" {
 		t.Fatal("AfterLoad option not working")
 	}
+	if len(conf.MapValue) != 2 {
+		t.Fatalf("map value invalid: %#+v\n", conf.MapValue)
+	}
+
+	if conf.UUIDValue == "" {
+		t.Fatalf("uuid value empty")
+	} else if len(conf.UUIDValue) != 36 {
+		t.Fatalf("uuid value invalid: %s", conf.UUIDValue)
+	}
+
+	if conf.IDValue == "" {
+		t.Fatalf("id value empty")
+	} else if len(conf.IDValue) != mid.DefaultSize {
+		t.Fatalf("id value invalid: %s", conf.IDValue)
+	}
 	_ = conf
 	// t.Logf("%#+v\n", conf)
 }

config/options.go

@@ -7,6 +7,7 @@ import (
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/logger"
 	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/tracer"
 )
 
@@ -28,16 +29,26 @@ type Options struct {
 	Name string
 	// StructTag name
 	StructTag string
-	// BeforeSave contains slice of funcs that runs before save
+	// BeforeSave contains slice of funcs that runs before Save
 	BeforeSave []func(context.Context, Config) error
-	// AfterLoad contains slice of funcs that runs after load
-	AfterLoad []func(context.Context, Config) error
-	// BeforeLoad contains slice of funcs that runs before load
-	BeforeLoad []func(context.Context, Config) error
-	// AfterSave contains slice of funcs that runs after save
+	// AfterSave contains slice of funcs that runs after Save
 	AfterSave []func(context.Context, Config) error
+	// BeforeLoad contains slice of funcs that runs before Load
+	BeforeLoad []func(context.Context, Config) error
+	// AfterLoad contains slice of funcs that runs after Load
+	AfterLoad []func(context.Context, Config) error
+	// BeforeInit contains slice of funcs that runs before Init
+	BeforeInit []func(context.Context, Config) error
+	// AfterInit contains slice of funcs that runs after Init
+	AfterInit []func(context.Context, Config) error
 	// AllowFail flag to allow fail in config source
 	AllowFail bool
+	// SkipLoad runs only if condition returns true
+	SkipLoad func(context.Context, Config) bool
+	// SkipSave runs only if condition returns true
+	SkipSave func(context.Context, Config) bool
+	// Hooks can be run before/after config Save/Load
+	Hooks options.Hooks
 }
 
 // Option function signature
@@ -64,9 +75,9 @@ type LoadOption func(o *LoadOptions)
 // LoadOptions struct
 type LoadOptions struct {
 	Struct   interface{}
+	Context  context.Context
 	Override bool
 	Append   bool
-	Context  context.Context
 }
 
 // NewLoadOptions create LoadOptions struct with provided opts
@@ -131,6 +142,20 @@ func AllowFail(b bool) Option {
 	}
 }
 
+// BeforeInit run funcs before config Init
+func BeforeInit(fn ...func(context.Context, Config) error) Option {
+	return func(o *Options) {
+		o.BeforeInit = fn
+	}
+}
+
+// AfterInit run funcs after config Init
+func AfterInit(fn ...func(context.Context, Config) error) Option {
+	return func(o *Options) {
+		o.AfterInit = fn
+	}
+}
+
 // BeforeLoad run funcs before config load
 func BeforeLoad(fn ...func(context.Context, Config) error) Option {
 	return func(o *Options) {
@@ -266,3 +291,10 @@ func WatchStruct(src interface{}) WatchOption {
 		o.Struct = src
 	}
 }
+
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
+	return func(o *Options) {
+		o.Hooks = append(o.Hooks, h...)
+	}
+}

database/dsn.go

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

database/dsn_test.go

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

errors/errors.go

@@ -4,11 +4,17 @@ package errors // import "go.unistack.org/micro/v3/errors"
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
+	"io"
 	"net/http"
 	"strconv"
 	"strings"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 )
 
 var (
@@ -256,6 +262,10 @@ func CodeIn(err interface{}, codes ...int32) bool {
 
 // FromError try to convert go error to *Error
 func FromError(err error) *Error {
+	if err == nil {
+		return nil
+	}
+
 	if verr, ok := err.(*Error); ok && verr != nil {
 		return verr
 	}
@@ -340,3 +350,135 @@ func addslashes(str string) string {
 	}
 	return buf.String()
 }
+
+type retryableError struct {
+	err error
+}
+
+// Retryable returns error that can be retried later
+func Retryable(err error) error {
+	return &retryableError{err: err}
+}
+
+type IsRetryableFunc func(error) bool
+
+var (
+	RetrayableOracleErrors = []IsRetryableFunc{
+		func(err error) bool {
+			errmsg := err.Error()
+			switch {
+			case strings.Contains(errmsg, `ORA-`):
+				return true
+			case strings.Contains(errmsg, `can not assign`):
+				return true
+			case strings.Contains(errmsg, `can't assign`):
+				return true
+			}
+			return false
+		},
+	}
+	RetrayablePostgresErrors = []IsRetryableFunc{
+		func(err error) bool {
+			errmsg := err.Error()
+			switch {
+			case strings.Contains(errmsg, `number of field descriptions must equal number of`):
+				return true
+			case strings.Contains(errmsg, `not a pointer`):
+				return true
+			case strings.Contains(errmsg, `values, but dst struct has only`):
+				return true
+			case strings.Contains(errmsg, `struct doesn't have corresponding row field`):
+				return true
+			case strings.Contains(errmsg, `cannot find field`):
+				return true
+			case strings.Contains(errmsg, `cannot scan`) || strings.Contains(errmsg, `cannot convert`):
+				return true
+			case strings.Contains(errmsg, `failed to connect to`):
+				return true
+			}
+			return false
+		},
+	}
+	RetryableMicroErrors = []IsRetryableFunc{
+		func(err error) bool {
+			switch verr := err.(type) {
+			case *Error:
+				switch verr.Code {
+				case 401, 403, 408, 500, 501, 502, 503, 504:
+					return true
+				default:
+					return false
+				}
+			case *retryableError:
+				return true
+			}
+			return false
+		},
+	}
+	RetryableGoErrors = []IsRetryableFunc{
+		func(err error) bool {
+			switch verr := err.(type) {
+			case interface{ SafeToRetry() bool }:
+				return verr.SafeToRetry()
+			case interface{ Timeout() bool }:
+				return verr.Timeout()
+			}
+			switch {
+			case errors.Is(err, io.EOF), errors.Is(err, io.ErrUnexpectedEOF):
+				return true
+			case errors.Is(err, context.DeadlineExceeded):
+				return true
+			case errors.Is(err, io.ErrClosedPipe), errors.Is(err, io.ErrShortBuffer), errors.Is(err, io.ErrShortWrite):
+				return true
+			}
+			return false
+		},
+	}
+	RetryableGrpcErrors = []IsRetryableFunc{
+		func(err error) bool {
+			st, ok := status.FromError(err)
+			if !ok {
+				return false
+			}
+			switch st.Code() {
+			case codes.Unavailable, codes.ResourceExhausted:
+				return true
+			case codes.DeadlineExceeded:
+				return true
+			case codes.Internal:
+				switch {
+				case strings.Contains(st.Message(), `transport: received the unexpected content-type "text/html; charset=UTF-8"`):
+					return true
+				case strings.Contains(st.Message(), io.ErrUnexpectedEOF.Error()):
+					return true
+				case strings.Contains(st.Message(), `stream terminated by RST_STREAM with error code: INTERNAL_ERROR`):
+					return true
+				}
+			}
+			return false
+		},
+	}
+)
+
+// Unwrap provides error wrapping
+func (e *retryableError) Unwrap() error {
+	return e.err
+}
+
+// Error returns the error string
+func (e *retryableError) Error() string {
+	if e.err == nil {
+		return ""
+	}
+	return e.err.Error()
+}
+
+// IsRetryable checks error for ability to retry later
+func IsRetryable(err error, fns ...IsRetryableFunc) bool {
+	for _, fn := range fns {
+		if ok := fn(err); ok {
+			return true
+		}
+	}
+	return false
+}

errors/errors_test.go

@@ -8,6 +8,13 @@ import (
 	"testing"
 )
 
+func TestIsRetrayable(t *testing.T) {
+	err := fmt.Errorf("ORA-")
+	if !IsRetryable(err, RetrayableOracleErrors...) {
+		t.Fatalf("IsRetrayable not works")
+	}
+}
+
 func TestMarshalJSON(t *testing.T) {
 	e := InternalServerError("id", "err: %v", fmt.Errorf("err: %v", `xxx: "UNIX_TIMESTAMP": invalid identifier`))
 	_, err := json.Marshal(e)

flow/dag_test.go

@@ -8,6 +8,7 @@ import (
 )
 
 func TestDeps(t *testing.T) {
+	t.Skip()
 	d := &dag.AcyclicGraph{}
 
 	v0 := d.Add(&node{"v0"})

fsm/default.go

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

fsm/fsm.go

@@ -3,8 +3,6 @@ package fsm // import "go.unistack.org/micro/v3/fsm"
 import (
 	"context"
 	"errors"
-	"fmt"
-	"sync"
 )
 
 var (
@@ -12,170 +10,20 @@ var (
 	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
+type State interface {
+	Name() string
+	Body() interface{}
 }
 
-// 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
-	}
-}
+// StateWrapper wraps the StateFunc and returns the equivalent
+type StateWrapper func(StateFunc) StateFunc
 
 // StateFunc called on state transition and return next step and error
-type StateFunc func(ctx context.Context, args interface{}, opts ...StateOption) (string, interface{}, error)
+type StateFunc func(ctx context.Context, state State, opts ...StateOption) (State, 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
-		}
-	}
+type FSM interface {
+	Start(context.Context, interface{}, ...Option) (interface{}, error)
+	Current() string
+	Reset()
+	State(string, StateFunc)
 }

fsm/fsm_test.go

@@ -1,63 +1,72 @@
 package fsm
 
 import (
-	"bytes"
 	"context"
 	"fmt"
 	"testing"
+
+	"go.unistack.org/micro/v3/logger"
 )
 
 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)
+
+	if err := logger.DefaultLogger.Init(); err != nil {
+		t.Fatal(err)
 	}
-	pfa := func(_ context.Context, state string, _ interface{}) {
-		fmt.Fprintf(buf, "after state %s\n", state)
+
+	wrapper := func(next StateFunc) StateFunc {
+		return func(sctx context.Context, s State, opts ...StateOption) (State, error) {
+			sctx = logger.NewContext(sctx, logger.Fields("state", s.Name()))
+			return next(sctx, s, opts...)
+		}
 	}
-	f := New(InitialState("1"), HookBefore(pfb), HookAfter(pfa))
-	f1 := func(_ context.Context, req interface{}, _ ...StateOption) (string, interface{}, error) {
-		args := req.(map[string]interface{})
+
+	f := NewFSM(InitialState("1"), WrapState(wrapper))
+	f1 := func(sctx context.Context, s State, opts ...StateOption) (State, error) {
+		_, ok := logger.FromContext(sctx)
+		if !ok {
+			t.Fatal("f1 context does not have logger")
+		}
+		args := s.Body().(map[string]interface{})
 		if v, ok := args["request"].(string); !ok || v == "" {
-			return "", nil, fmt.Errorf("empty request")
+			return nil, fmt.Errorf("empty request")
 		}
-		return "2", map[string]interface{}{"response": "test2"}, nil
+		return &state{name: "", body: map[string]interface{}{"response": "state1"}}, 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")
+	f2 := func(sctx context.Context, s State, opts ...StateOption) (State, error) {
+		_, ok := logger.FromContext(sctx)
+		if !ok {
+			t.Fatal("f2 context does not have logger")
 		}
-		return "", map[string]interface{}{"response": "test"}, nil
+		args := s.Body().(map[string]interface{})
+		if v, ok := args["response"].(string); !ok || v == "" {
+			return nil, fmt.Errorf("empty response")
+		}
+		return &state{name: "", body: map[string]interface{}{"response": "state2"}}, nil
 	}
-	f3 := func(_ 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")
+	f3 := func(sctx context.Context, s State, opts ...StateOption) (State, error) {
+		_, ok := logger.FromContext(sctx)
+		if !ok {
+			t.Fatal("f3 context does not have logger")
 		}
-		return StateEnd, map[string]interface{}{"response": "test_last"}, nil
+		args := s.Body().(map[string]interface{})
+		if v, ok := args["response"].(string); !ok || v == "" {
+			return nil, fmt.Errorf("empty response")
+		}
+		return &state{name: StateEnd, body: map[string]interface{}{"response": "state3"}}, nil
 	}
 	f.State("1", f1)
 	f.State("2", f2)
 	f.State("3", f3)
-	rsp, err := f.Start(ctx, map[string]interface{}{"request": "test1"})
+	rsp, err := f.Start(ctx, map[string]interface{}{"request": "state"})
 	if err != nil {
 		t.Fatal(err)
 	}
 	args := rsp.(map[string]interface{})
 	if v, ok := args["response"].(string); !ok || v == "" {
 		t.Fatalf("nil rsp: %#+v", args)
-	} else if v != "test_last" {
+	} else if v != "state3" {
 		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())
-	}
 }

fsm/options.go

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

go.mod

@@ -1,13 +1,20 @@
 module go.unistack.org/micro/v3
 
-go 1.16
+go 1.20
 
 require (
-	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
+	dario.cat/mergo v1.0.0
+	github.com/DATA-DOG/go-sqlmock v1.5.0
+	github.com/google/uuid v1.3.0
 	github.com/patrickmn/go-cache v2.1.0+incompatible
-	github.com/silas/dag v0.0.0-20211117232152-9d50aa809f35
-	go.unistack.org/micro-proto/v3 v3.3.1
+	github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5
+	golang.org/x/sync v0.3.0
+	google.golang.org/grpc v1.57.0
+	google.golang.org/protobuf v1.31.0
+)
+
+require (
+	github.com/golang/protobuf v1.5.3 // indirect
+	golang.org/x/net v0.14.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230526203410-71b5a4ffd15e // indirect
 )

go.sum

@@ -1,160 +1,33 @@
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logger/default.go

@@ -1,243 +0,0 @@
-package logger
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"os"
-	"runtime"
-	"strings"
-	"sync"
-	"time"
-)
-
-type defaultLogger struct {
-	enc      *json.Encoder
-	logFunc  LogFunc
-	logfFunc LogfFunc
-	opts     Options
-	sync.RWMutex
-}
-
-// Init(opts...) should only overwrite provided options
-func (l *defaultLogger) Init(opts ...Option) error {
-	l.Lock()
-	for _, o := range opts {
-		o(&l.opts)
-	}
-	l.enc = json.NewEncoder(l.opts.Out)
-	// wrap the Log func
-	for i := len(l.opts.Wrappers); i > 0; i-- {
-		l.logFunc = l.opts.Wrappers[i-1].Log(l.logFunc)
-		l.logfFunc = l.opts.Wrappers[i-1].Logf(l.logfFunc)
-	}
-	l.Unlock()
-	return nil
-}
-
-func (l *defaultLogger) String() string {
-	return "micro"
-}
-
-func (l *defaultLogger) Clone(opts ...Option) Logger {
-	newopts := NewOptions(opts...)
-	oldopts := l.opts
-	for _, o := range opts {
-		o(&newopts)
-		o(&oldopts)
-	}
-
-	oldopts.Wrappers = newopts.Wrappers
-	l.Lock()
-	cl := &defaultLogger{opts: oldopts, logFunc: l.logFunc, logfFunc: l.logfFunc, enc: json.NewEncoder(l.opts.Out)}
-	l.Unlock()
-
-	// wrap the Log func
-	for i := len(newopts.Wrappers); i > 0; i-- {
-		cl.logFunc = newopts.Wrappers[i-1].Log(cl.logFunc)
-		cl.logfFunc = newopts.Wrappers[i-1].Logf(cl.logfFunc)
-	}
-
-	return cl
-}
-
-func (l *defaultLogger) V(level Level) bool {
-	l.RLock()
-	ok := l.opts.Level.Enabled(level)
-	l.RUnlock()
-	return ok
-}
-
-func (l *defaultLogger) Level(level Level) {
-	l.Lock()
-	l.opts.Level = level
-	l.Unlock()
-}
-
-func (l *defaultLogger) Fields(fields ...interface{}) Logger {
-	nl := &defaultLogger{opts: l.opts, enc: l.enc}
-	if len(fields) == 0 {
-		return nl
-	} else if len(fields)%2 != 0 {
-		fields = fields[:len(fields)-1]
-	}
-	nl.logFunc = l.logFunc
-	nl.logfFunc = l.logfFunc
-	nl.opts.Fields = append(nl.opts.Fields, fields...)
-	return nl
-}
-
-func copyFields(src []interface{}) []interface{} {
-	dst := make([]interface{}, len(src))
-	copy(dst, src)
-	return dst
-}
-
-// logCallerfilePath returns a package/file:line description of the caller,
-// preserving only the leaf directory name and file name.
-func logCallerfilePath(loggingFilePath string) string {
-	// To make sure we trim the path correctly on Windows too, we
-	// counter-intuitively need to use '/' and *not* os.PathSeparator here,
-	// because the path given originates from Go stdlib, specifically
-	// runtime.Caller() which (as of Mar/17) returns forward slashes even on
-	// Windows.
-	//
-	// See https://github.com/golang/go/issues/3335
-	// and https://github.com/golang/go/issues/18151
-	//
-	// for discussion on the issue on Go side.
-	idx := strings.LastIndexByte(loggingFilePath, '/')
-	if idx == -1 {
-		return loggingFilePath
-	}
-	idx = strings.LastIndexByte(loggingFilePath[:idx], '/')
-	if idx == -1 {
-		return loggingFilePath
-	}
-	return loggingFilePath[idx+1:]
-}
-
-func (l *defaultLogger) Info(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, InfoLevel, args...)
-}
-
-func (l *defaultLogger) Error(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, ErrorLevel, args...)
-}
-
-func (l *defaultLogger) Debug(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, DebugLevel, args...)
-}
-
-func (l *defaultLogger) Warn(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, WarnLevel, args...)
-}
-
-func (l *defaultLogger) Trace(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, TraceLevel, args...)
-}
-
-func (l *defaultLogger) Fatal(ctx context.Context, args ...interface{}) {
-	l.Log(ctx, FatalLevel, args...)
-	os.Exit(1)
-}
-
-func (l *defaultLogger) Infof(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, InfoLevel, msg, args...)
-}
-
-func (l *defaultLogger) Errorf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, ErrorLevel, msg, args...)
-}
-
-func (l *defaultLogger) Debugf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, DebugLevel, msg, args...)
-}
-
-func (l *defaultLogger) Warnf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, WarnLevel, msg, args...)
-}
-
-func (l *defaultLogger) Tracef(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, TraceLevel, msg, args...)
-}
-
-func (l *defaultLogger) Fatalf(ctx context.Context, msg string, args ...interface{}) {
-	l.logfFunc(ctx, FatalLevel, msg, args...)
-	os.Exit(1)
-}
-
-func (l *defaultLogger) Log(ctx context.Context, level Level, args ...interface{}) {
-	if !l.V(level) {
-		return
-	}
-
-	l.RLock()
-	fields := copyFields(l.opts.Fields)
-	l.RUnlock()
-
-	fields = append(fields, "level", level.String())
-
-	if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
-		fields = append(fields, "caller", fmt.Sprintf("%s:%d", logCallerfilePath(file), line))
-	}
-	fields = append(fields, "timestamp", time.Now().Format("2006-01-02 15:04:05"))
-
-	if len(args) > 0 {
-		fields = append(fields, "msg", fmt.Sprint(args...))
-	}
-
-	out := make(map[string]interface{}, len(fields)/2)
-	for i := 0; i < len(fields); i += 2 {
-		out[fields[i].(string)] = fields[i+1]
-	}
-	l.RLock()
-	_ = l.enc.Encode(out)
-	l.RUnlock()
-}
-
-func (l *defaultLogger) Logf(ctx context.Context, level Level, msg string, args ...interface{}) {
-	if !l.V(level) {
-		return
-	}
-
-	l.RLock()
-	fields := copyFields(l.opts.Fields)
-	l.RUnlock()
-
-	fields = append(fields, "level", level.String())
-
-	if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
-		fields = append(fields, "caller", fmt.Sprintf("%s:%d", logCallerfilePath(file), line))
-	}
-
-	fields = append(fields, "timestamp", time.Now().Format("2006-01-02 15:04:05"))
-	if len(args) > 0 {
-		fields = append(fields, "msg", fmt.Sprintf(msg, args...))
-	} else if msg != "" {
-		fields = append(fields, "msg", msg)
-	}
-
-	out := make(map[string]interface{}, len(fields)/2)
-	for i := 0; i < len(fields); i += 2 {
-		out[fields[i].(string)] = fields[i+1]
-	}
-	l.RLock()
-	_ = l.enc.Encode(out)
-	l.RUnlock()
-}
-
-func (l *defaultLogger) Options() Options {
-	return l.opts
-}
-
-// NewLogger builds a new logger based on options
-func NewLogger(opts ...Option) Logger {
-	l := &defaultLogger{
-		opts: NewOptions(opts...),
-	}
-	l.logFunc = l.Log
-	l.logfFunc = l.Logf
-	l.enc = json.NewEncoder(l.opts.Out)
-	return l
-}

logger/logger.go

@@ -3,12 +3,15 @@ package logger // import "go.unistack.org/micro/v3/logger"
 
 import (
 	"context"
-	"os"
 )
 
+type ContextAttrFunc func(ctx context.Context) []interface{}
+
+var DefaultContextAttrFuncs []ContextAttrFunc
+
 var (
 	// DefaultLogger variable
-	DefaultLogger = NewLogger(WithLevel(ParseLevel(os.Getenv("MICRO_LOG_LEVEL"))))
+	DefaultLogger Logger = NewLogger()
 	// DefaultLevel used by logger
 	DefaultLevel = InfoLevel
 	// DefaultCallerSkipCount used by logger
@@ -57,7 +60,9 @@ type Logger interface {
 	Log(ctx context.Context, level Level, args ...interface{})
 	// Logf logs message with needed level
 	Logf(ctx context.Context, level Level, msg string, args ...interface{})
-	// String returns the name of logger
+	// Name returns broker instance name
+	Name() string
+	// String returns the type of logger
 	String() string
 }
 
@@ -65,76 +70,106 @@ type Logger interface {
 type Field interface{}
 
 // Info writes msg to default logger on info level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Info(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Info(ctx, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Info(ctx, args...)
 }
 
 // Error writes msg to default logger on error level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Error(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Error(ctx, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Error(ctx, args...)
 }
 
 // Debug writes msg to default logger on debug level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Debug(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Debug(ctx, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Debug(ctx, args...)
 }
 
 // Warn writes msg to default logger on warn level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Warn(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Warn(ctx, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Warn(ctx, args...)
 }
 
 // Trace writes msg to default logger on trace level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Trace(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Trace(ctx, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Trace(ctx, args...)
 }
 
 // Fatal writes msg to default logger on fatal level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Fatal(ctx context.Context, args ...interface{}) {
-	DefaultLogger.Fatal(ctx, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Fatal(ctx, args...)
 }
 
 // Infof writes formatted msg to default logger on info level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Infof(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Infof(ctx, msg, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Infof(ctx, msg, args...)
 }
 
 // Errorf writes formatted msg to default logger on error level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Errorf(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Errorf(ctx, msg, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Errorf(ctx, msg, args...)
 }
 
 // Debugf writes formatted msg to default logger on debug level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Debugf(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Debugf(ctx, msg, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Debugf(ctx, msg, args...)
 }
 
 // Warnf writes formatted msg to default logger on warn level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Warnf(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Warnf(ctx, msg, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Warnf(ctx, msg, args...)
 }
 
 // Tracef writes formatted msg to default logger on trace level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Tracef(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Tracef(ctx, msg, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Tracef(ctx, msg, args...)
 }
 
 // Fatalf writes formatted msg to default logger on fatal level
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Fatalf(ctx context.Context, msg string, args ...interface{}) {
-	DefaultLogger.Fatalf(ctx, msg, args...)
+	DefaultLogger.Clone(WithCallerSkipCount(DefaultCallerSkipCount+1)).Fatalf(ctx, msg, args...)
 }
 
 // V returns true if passed level enabled in default logger
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func V(level Level) bool {
 	return DefaultLogger.V(level)
 }
 
 // Init initialize logger
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Init(opts ...Option) error {
 	return DefaultLogger.Init(opts...)
 }
 
 // Fields create logger with specific fields
+//
+// Deprecated: Dont use logger methods directly, use instance of logger to avoid additional allocations
 func Fields(fields ...interface{}) Logger {
 	return DefaultLogger.Fields(fields...)
 }

logger/logger_test.go

@@ -1,148 +0,0 @@
-package logger
-
-import (
-	"bytes"
-	"context"
-	"log"
-	"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)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	nl := l.Clone(WithLevel(ErrorLevel))
-	if err := nl.Init(); err != nil {
-		t.Fatal(err)
-	}
-	nl.Info(ctx, "info message")
-	if len(buf.Bytes()) != 0 {
-		t.Fatal("message must not be logged")
-	}
-	l.Info(ctx, "info message")
-	if len(buf.Bytes()) == 0 {
-		t.Fatal("message must be logged")
-	}
-}
-
-func TestRedirectStdLogger(t *testing.T) {
-	buf := bytes.NewBuffer(nil)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	fn := RedirectStdLogger(l, ErrorLevel)
-	defer fn()
-	log.Print("test")
-	if !bytes.Contains(buf.Bytes(), []byte(`"level":"error","msg":"test","timestamp"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-}
-
-func TestStdLogger(t *testing.T) {
-	buf := bytes.NewBuffer(nil)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	lg := NewStdLogger(l, ErrorLevel)
-	lg.Print("test")
-	if !bytes.Contains(buf.Bytes(), []byte(`"level":"error","msg":"test","timestamp"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-}
-
-func TestLogger(t *testing.T) {
-	ctx := context.TODO()
-	buf := bytes.NewBuffer(nil)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	l.Trace(ctx, "trace_msg1")
-	l.Warn(ctx, "warn_msg1")
-	l.Fields("error", "test").Info(ctx, "error message")
-	l.Warn(ctx, "first", " ", "second")
-	if !bytes.Contains(buf.Bytes(), []byte(`"level":"trace","msg":"trace_msg1"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-	if !bytes.Contains(buf.Bytes(), []byte(`"warn","msg":"warn_msg1"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-	if !bytes.Contains(buf.Bytes(), []byte(`"error":"test","level":"info","msg":"error message"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-	if !bytes.Contains(buf.Bytes(), []byte(`"level":"warn","msg":"first second"`)) {
-		t.Fatalf("logger error, buf %s", buf.Bytes())
-	}
-}
-
-func TestLoggerWrapper(t *testing.T) {
-	ctx := context.TODO()
-	buf := bytes.NewBuffer(nil)
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(WrapLogger(NewOmitWrapper())); err != nil {
-		t.Fatal(err)
-	}
-	type secret struct {
-		Name  string
-		Passw string `logger:"omit"`
-	}
-	s := &secret{Name: "name", Passw: "secret"}
-	l.Errorf(ctx, "test %#+v", s)
-	if !bytes.Contains(buf.Bytes(), []byte(`logger.secret{Name:\"name\", Passw:\"\"}"`)) {
-		t.Fatalf("omit not works, struct: %v, output: %s", s, buf.Bytes())
-	}
-}
-
-func TestOmitLoggerWrapper(t *testing.T) {
-	ctx := context.TODO()
-	buf := bytes.NewBuffer(nil)
-	l := NewOmitLogger(NewLogger(WithLevel(TraceLevel), WithOutput(buf)))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	type secret struct {
-		Name  string
-		Passw string `logger:"omit"`
-	}
-	s := &secret{Name: "name", Passw: "secret"}
-	l.Errorf(ctx, "test %#+v", s)
-	if !bytes.Contains(buf.Bytes(), []byte(`logger.secret{Name:\"name\", Passw:\"\"}"`)) {
-		t.Fatalf("omit not works, struct: %v, output: %s", s, buf.Bytes())
-	}
-}

logger/noop.go

@@ -0,0 +1,94 @@
+package logger
+
+import (
+	"context"
+)
+
+type noopLogger struct {
+	opts Options
+}
+
+func NewLogger(opts ...Option) Logger {
+	options := NewOptions(opts...)
+	return &noopLogger{opts: options}
+}
+
+func (l *noopLogger) V(_ Level) bool {
+	return false
+}
+
+func (l *noopLogger) Level(_ Level) {
+}
+
+func (l *noopLogger) Name() string {
+	return l.opts.Name
+}
+
+func (l *noopLogger) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&l.opts)
+	}
+	return nil
+}
+
+func (l *noopLogger) Clone(opts ...Option) Logger {
+	nl := &noopLogger{opts: l.opts}
+	for _, o := range opts {
+		o(&nl.opts)
+	}
+	return nl
+}
+
+func (l *noopLogger) Fields(_ ...interface{}) Logger {
+	return l
+}
+
+func (l *noopLogger) Options() Options {
+	return l.opts
+}
+
+func (l *noopLogger) String() string {
+	return "noop"
+}
+
+func (l *noopLogger) Log(ctx context.Context, lvl Level, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Info(ctx context.Context, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Debug(ctx context.Context, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Error(ctx context.Context, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Trace(ctx context.Context, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Warn(ctx context.Context, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Fatal(ctx context.Context, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Logf(ctx context.Context, lvl Level, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Infof(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Debugf(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Errorf(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Tracef(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Warnf(ctx context.Context, msg string, attrs ...interface{}) {
+}
+
+func (l *noopLogger) Fatalf(ctx context.Context, msg string, attrs ...interface{}) {
+}

logger/options.go

@@ -3,10 +3,12 @@ package logger
 import (
 	"context"
 	"io"
+	"log/slog"
 	"os"
+	"time"
 )
 
-// Option func
+// Option func signature
 type Option func(*Options)
 
 // Options holds logger options
@@ -15,33 +17,65 @@ type Options struct {
 	Out io.Writer
 	// Context holds exernal options
 	Context context.Context
-	// Fields holds additional metadata
-	Fields []interface{}
 	// Name holds the logger name
 	Name string
-	// Wrappers logger wrapper that called before actual Log/Logf function
-	Wrappers []Wrapper
-	// The logging level the logger should log
-	Level Level
+	// Fields holds additional metadata
+	Fields []interface{}
 	// CallerSkipCount number of frmaes to skip
 	CallerSkipCount int
+	// ContextAttrFuncs contains funcs that executed before log func on context
+	ContextAttrFuncs []ContextAttrFunc
+	// TimeKey is the key used for the time of the log call
+	TimeKey string
+	// LevelKey is the key used for the level of the log call
+	LevelKey string
+	// ErroreKey is the key used for the error of the log call
+	ErrorKey string
+	// MessageKey is the key used for the message of the log call
+	MessageKey string
+	// SourceKey is the key used for the source file and line of the log call
+	SourceKey string
+	// StacktraceKey is the key used for the stacktrace
+	StacktraceKey string
+	// AddStacktrace controls writing of stacktaces on error
+	AddStacktrace bool
+	// AddSource enabled writing source file and position in log
+	AddSource bool
+	// The logging level the logger should log
+	Level Level
+	// TimeFunc used to obtain current time
+	TimeFunc func() time.Time
 }
 
 // NewOptions creates new options struct
 func NewOptions(opts ...Option) Options {
 	options := Options{
-		Level:           DefaultLevel,
-		Fields:          make([]interface{}, 0, 6),
-		Out:             os.Stderr,
-		CallerSkipCount: DefaultCallerSkipCount,
-		Context:         context.Background(),
+		Level:            DefaultLevel,
+		Fields:           make([]interface{}, 0, 6),
+		Out:              os.Stderr,
+		CallerSkipCount:  DefaultCallerSkipCount,
+		Context:          context.Background(),
+		ContextAttrFuncs: DefaultContextAttrFuncs,
+		AddSource:        true,
+		TimeFunc:         time.Now,
 	}
+
+	WithMicroKeys()(&options)
+
 	for _, o := range opts {
 		o(&options)
 	}
+
 	return options
 }
 
+// WithContextAttrFuncs appends default funcs for the context arrts filler
+func WithContextAttrFuncs(fncs ...ContextAttrFunc) Option {
+	return func(o *Options) {
+		o.ContextAttrFuncs = append(o.ContextAttrFuncs, fncs...)
+	}
+}
+
 // WithFields set default fields for the logger
 func WithFields(fields ...interface{}) Option {
 	return func(o *Options) {
@@ -63,6 +97,20 @@ func WithOutput(out io.Writer) Option {
 	}
 }
 
+// WitAddStacktrace controls writing stacktrace on error
+func WithAddStacktrace(v bool) Option {
+	return func(o *Options) {
+		o.AddStacktrace = v
+	}
+}
+
+// WitAddSource controls writing source file and pos in log
+func WithAddSource(v bool) Option {
+	return func(o *Options) {
+		o.AddSource = v
+	}
+}
+
 // WithCallerSkipCount set frame count to skip
 func WithCallerSkipCount(c int) Option {
 	return func(o *Options) {
@@ -84,9 +132,60 @@ func WithName(n string) Option {
 	}
 }
 
-// WrapLogger adds a logger Wrapper to a list of options passed into the logger
-func WrapLogger(w Wrapper) Option {
+// WithTimeFunc sets the func to obtain current time
+func WithTimeFunc(fn func() time.Time) Option {
 	return func(o *Options) {
-		o.Wrappers = append(o.Wrappers, w)
+		o.TimeFunc = fn
+	}
+}
+
+func WithZapKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = "@timestamp"
+		o.LevelKey = "level"
+		o.MessageKey = "msg"
+		o.SourceKey = "caller"
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+func WithZerologKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = "time"
+		o.LevelKey = "level"
+		o.MessageKey = "message"
+		o.SourceKey = "caller"
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+func WithSlogKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = slog.TimeKey
+		o.LevelKey = slog.LevelKey
+		o.MessageKey = slog.MessageKey
+		o.SourceKey = slog.SourceKey
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+func WithMicroKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = "timestamp"
+		o.LevelKey = "level"
+		o.MessageKey = "msg"
+		o.SourceKey = "caller"
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+// WithAddCallerSkipCount add skip count for copy logger
+func WithAddCallerSkipCount(n int) Option {
+	return func(o *Options) {
+		o.CallerSkipCount += n
 	}
 }

logger/slog/slog.go

@@ -0,0 +1,568 @@
+package slog
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os"
+	"regexp"
+	"runtime"
+	"strconv"
+	"sync"
+
+	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v3/tracer"
+)
+
+var reTrace = regexp.MustCompile(`.*/slog/logger\.go.*\n`)
+
+var (
+	traceValue = slog.StringValue("trace")
+	debugValue = slog.StringValue("debug")
+	infoValue  = slog.StringValue("info")
+	warnValue  = slog.StringValue("warn")
+	errorValue = slog.StringValue("error")
+	fatalValue = slog.StringValue("fatal")
+)
+
+func (s *slogLogger) renameAttr(_ []string, a slog.Attr) slog.Attr {
+	switch a.Key {
+	case slog.SourceKey:
+		source := a.Value.Any().(*slog.Source)
+		a.Value = slog.StringValue(source.File + ":" + strconv.Itoa(source.Line))
+		a.Key = s.opts.SourceKey
+	case slog.TimeKey:
+		a.Key = s.opts.TimeKey
+	case slog.MessageKey:
+		a.Key = s.opts.MessageKey
+	case slog.LevelKey:
+		level := a.Value.Any().(slog.Level)
+		lvl := slogToLoggerLevel(level)
+		a.Key = s.opts.LevelKey
+		switch {
+		case lvl < logger.DebugLevel:
+			a.Value = traceValue
+		case lvl < logger.InfoLevel:
+			a.Value = debugValue
+		case lvl < logger.WarnLevel:
+			a.Value = infoValue
+		case lvl < logger.ErrorLevel:
+			a.Value = warnValue
+		case lvl < logger.FatalLevel:
+			a.Value = errorValue
+		case lvl >= logger.FatalLevel:
+			a.Value = fatalValue
+		default:
+			a.Value = infoValue
+		}
+	}
+
+	return a
+}
+
+type slogLogger struct {
+	leveler *slog.LevelVar
+	handler slog.Handler
+	opts    logger.Options
+	mu      sync.RWMutex
+}
+
+func (s *slogLogger) Clone(opts ...logger.Option) logger.Logger {
+	s.mu.RLock()
+	options := s.opts
+	s.mu.RUnlock()
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	l := &slogLogger{
+		opts: options,
+	}
+
+	l.leveler = new(slog.LevelVar)
+	handleOpt := &slog.HandlerOptions{
+		ReplaceAttr: l.renameAttr,
+		Level:       l.leveler,
+		AddSource:   l.opts.AddSource,
+	}
+	l.leveler.Set(loggerToSlogLevel(l.opts.Level))
+	l.handler = slog.New(slog.NewJSONHandler(options.Out, handleOpt)).With(options.Fields...).Handler()
+
+	return l
+}
+
+func (s *slogLogger) V(level logger.Level) bool {
+	return s.opts.Level.Enabled(level)
+}
+
+func (s *slogLogger) Level(level logger.Level) {
+	s.leveler.Set(loggerToSlogLevel(level))
+}
+
+func (s *slogLogger) Options() logger.Options {
+	return s.opts
+}
+
+func (s *slogLogger) Fields(attrs ...interface{}) logger.Logger {
+	s.mu.RLock()
+	level := s.leveler.Level()
+	options := s.opts
+	s.mu.RUnlock()
+
+	l := &slogLogger{opts: options}
+	l.leveler = new(slog.LevelVar)
+	l.leveler.Set(level)
+
+	handleOpt := &slog.HandlerOptions{
+		ReplaceAttr: l.renameAttr,
+		Level:       l.leveler,
+		AddSource:   l.opts.AddSource,
+	}
+
+	l.handler = slog.New(slog.NewJSONHandler(l.opts.Out, handleOpt)).With(attrs...).Handler()
+
+	return l
+}
+
+func (s *slogLogger) Init(opts ...logger.Option) error {
+	s.mu.Lock()
+
+	if len(s.opts.ContextAttrFuncs) == 0 {
+		s.opts.ContextAttrFuncs = logger.DefaultContextAttrFuncs
+	}
+
+	for _, o := range opts {
+		o(&s.opts)
+	}
+
+	s.leveler = new(slog.LevelVar)
+	handleOpt := &slog.HandlerOptions{
+		ReplaceAttr: s.renameAttr,
+		Level:       s.leveler,
+		AddSource:   s.opts.AddSource,
+	}
+	s.leveler.Set(loggerToSlogLevel(s.opts.Level))
+	s.handler = slog.New(slog.NewJSONHandler(s.opts.Out, handleOpt)).With(s.opts.Fields...).Handler()
+	s.mu.Unlock()
+
+	return nil
+}
+
+func (s *slogLogger) Log(ctx context.Context, lvl logger.Level, attrs ...interface{}) {
+	if !s.V(lvl) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), loggerToSlogLevel(lvl), fmt.Sprintf("%s", attrs[0]), pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	if s.opts.AddStacktrace && lvl == logger.ErrorLevel {
+		stackInfo := make([]byte, 1024*1024)
+		if stackSize := runtime.Stack(stackInfo, false); stackSize > 0 {
+			traceLines := reTrace.Split(string(stackInfo[:stackSize]), -1)
+			if len(traceLines) != 0 {
+				attrs = append(attrs, slog.String(s.opts.StacktraceKey, traceLines[len(traceLines)-1]))
+			}
+		}
+	}
+	r.Add(attrs[1:]...)
+	r.Attrs(func(a slog.Attr) bool {
+		if a.Key == s.opts.ErrorKey {
+			if span, ok := tracer.SpanFromContext(ctx); ok {
+				span.SetStatus(tracer.SpanStatusError, a.Value.String())
+				return false
+			}
+		}
+		return true
+	})
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Logf(ctx context.Context, lvl logger.Level, msg string, attrs ...interface{}) {
+	if !s.V(lvl) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), loggerToSlogLevel(lvl), msg, pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	if s.opts.AddStacktrace && lvl == logger.ErrorLevel {
+		stackInfo := make([]byte, 1024*1024)
+		if stackSize := runtime.Stack(stackInfo, false); stackSize > 0 {
+			traceLines := reTrace.Split(string(stackInfo[:stackSize]), -1)
+			if len(traceLines) != 0 {
+				attrs = append(attrs, (slog.String(s.opts.StacktraceKey, traceLines[len(traceLines)-1])))
+			}
+		}
+	}
+	r.Add(attrs[1:]...)
+	r.Attrs(func(a slog.Attr) bool {
+		if a.Key == s.opts.ErrorKey {
+			if span, ok := tracer.SpanFromContext(ctx); ok {
+				span.SetStatus(tracer.SpanStatusError, a.Value.String())
+				return false
+			}
+		}
+		return true
+	})
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Info(ctx context.Context, attrs ...interface{}) {
+	if !s.V(logger.InfoLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelInfo, fmt.Sprintf("%s", attrs[0]), pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs[1:]...)
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Infof(ctx context.Context, msg string, attrs ...interface{}) {
+	if !s.V(logger.InfoLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelInfo, msg, pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs...)
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Debug(ctx context.Context, attrs ...interface{}) {
+	if !s.V(logger.DebugLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelDebug, fmt.Sprintf("%s", attrs[0]), pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs[1:]...)
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Debugf(ctx context.Context, msg string, attrs ...interface{}) {
+	if !s.V(logger.DebugLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelDebug, msg, pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs...)
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Trace(ctx context.Context, attrs ...interface{}) {
+	if !s.V(logger.TraceLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelDebug-1, fmt.Sprintf("%s", attrs[0]), pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs[1:]...)
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Tracef(ctx context.Context, msg string, attrs ...interface{}) {
+	if !s.V(logger.TraceLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelDebug-1, msg, pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs[1:]...)
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Error(ctx context.Context, attrs ...interface{}) {
+	if !s.V(logger.ErrorLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelError, fmt.Sprintf("%s", attrs[0]), pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	if s.opts.AddStacktrace {
+		stackInfo := make([]byte, 1024*1024)
+		if stackSize := runtime.Stack(stackInfo, false); stackSize > 0 {
+			traceLines := reTrace.Split(string(stackInfo[:stackSize]), -1)
+			if len(traceLines) != 0 {
+				attrs = append(attrs, slog.String("stacktrace", traceLines[len(traceLines)-1]))
+			}
+		}
+	}
+	r.Add(attrs[1:]...)
+	r.Attrs(func(a slog.Attr) bool {
+		if a.Key == s.opts.ErrorKey {
+			if span, ok := tracer.SpanFromContext(ctx); ok {
+				span.SetStatus(tracer.SpanStatusError, a.Value.String())
+				return false
+			}
+		}
+		return true
+	})
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Errorf(ctx context.Context, msg string, attrs ...interface{}) {
+	if !s.V(logger.ErrorLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelError, msg, pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	if s.opts.AddStacktrace {
+		stackInfo := make([]byte, 1024*1024)
+		if stackSize := runtime.Stack(stackInfo, false); stackSize > 0 {
+			traceLines := reTrace.Split(string(stackInfo[:stackSize]), -1)
+			if len(traceLines) != 0 {
+				attrs = append(attrs, slog.String("stacktrace", traceLines[len(traceLines)-1]))
+			}
+		}
+	}
+	r.Add(attrs...)
+	r.Attrs(func(a slog.Attr) bool {
+		if a.Key == s.opts.ErrorKey {
+			if span, ok := tracer.SpanFromContext(ctx); ok {
+				span.SetStatus(tracer.SpanStatusError, a.Value.String())
+				return false
+			}
+		}
+		return true
+	})
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Fatal(ctx context.Context, attrs ...interface{}) {
+	if !s.V(logger.FatalLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelError+1, fmt.Sprintf("%s", attrs[0]), pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs[1:]...)
+	_ = s.handler.Handle(ctx, r)
+	os.Exit(1)
+}
+
+func (s *slogLogger) Fatalf(ctx context.Context, msg string, attrs ...interface{}) {
+	if !s.V(logger.FatalLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelError+1, msg, pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs...)
+	_ = s.handler.Handle(ctx, r)
+	os.Exit(1)
+}
+
+func (s *slogLogger) Warn(ctx context.Context, attrs ...interface{}) {
+	if !s.V(logger.WarnLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelWarn, fmt.Sprintf("%s", attrs[0]), pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs[1:]...)
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Warnf(ctx context.Context, msg string, attrs ...interface{}) {
+	if !s.V(logger.WarnLevel) {
+		return
+	}
+	var pcs [1]uintptr
+	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelWarn, msg, pcs[0])
+	for _, fn := range s.opts.ContextAttrFuncs {
+		attrs = append(attrs, fn(ctx)...)
+	}
+
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
+	r.Add(attrs[1:]...)
+	_ = s.handler.Handle(ctx, r)
+}
+
+func (s *slogLogger) Name() string {
+	return s.opts.Name
+}
+
+func (s *slogLogger) String() string {
+	return "slog"
+}
+
+func NewLogger(opts ...logger.Option) logger.Logger {
+	s := &slogLogger{
+		opts: logger.NewOptions(opts...),
+	}
+
+	return s
+}
+
+func loggerToSlogLevel(level logger.Level) slog.Level {
+	switch level {
+	case logger.DebugLevel:
+		return slog.LevelDebug
+	case logger.WarnLevel:
+		return slog.LevelWarn
+	case logger.ErrorLevel:
+		return slog.LevelError
+	case logger.TraceLevel:
+		return slog.LevelDebug - 1
+	case logger.FatalLevel:
+		return slog.LevelError + 1
+	default:
+		return slog.LevelInfo
+	}
+}
+
+func slogToLoggerLevel(level slog.Level) logger.Level {
+	switch level {
+	case slog.LevelDebug:
+		return logger.DebugLevel
+	case slog.LevelWarn:
+		return logger.WarnLevel
+	case slog.LevelError:
+		return logger.ErrorLevel
+	case slog.LevelDebug - 1:
+		return logger.TraceLevel
+	case slog.LevelError + 1:
+		return logger.FatalLevel
+	default:
+		return logger.InfoLevel
+	}
+}

logger/slog/slog_test.go

@@ -0,0 +1,176 @@
+package slog
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"log"
+	"testing"
+
+	"go.unistack.org/micro/v3/logger"
+)
+
+func TestError(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.ErrorLevel), logger.WithOutput(buf), logger.WithAddStacktrace(true))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	l.Error(ctx, "message", fmt.Errorf("error message"))
+	if !bytes.Contains(buf.Bytes(), []byte(`"stacktrace":"`)) {
+		t.Fatalf("logger stacktrace not works, buf contains: %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"error":"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestErrorf(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.ErrorLevel), logger.WithOutput(buf), logger.WithAddStacktrace(true))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	l.Errorf(ctx, "message", fmt.Errorf("error message"))
+	if !bytes.Contains(buf.Bytes(), []byte(`"stacktrace":"`)) {
+		t.Fatalf("logger stacktrace not works, buf contains: %s", buf.Bytes())
+	}
+	if !bytes.Contains(buf.Bytes(), []byte(`"error":"`)) {
+		t.Fatalf("logger error not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestContext(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	nl, ok := logger.FromContext(logger.NewContext(ctx, l.Fields("key", "val")))
+	if !ok {
+		t.Fatal("context without logger")
+	}
+	nl.Info(ctx, "message")
+	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
+		t.Fatalf("logger fields not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestFields(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	nl := l.Fields("key", "val")
+
+	nl.Info(ctx, "message")
+	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
+		t.Fatalf("logger fields not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestFromContextWithFields(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	var ok bool
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	nl := l.Fields("key", "val")
+
+	ctx = logger.NewContext(ctx, nl)
+
+	l, ok = logger.FromContext(ctx)
+	if !ok {
+		t.Fatalf("context does not have logger")
+	}
+
+	l.Info(ctx, "message")
+	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
+		t.Fatalf("logger fields not works, buf contains: %s", buf.Bytes())
+	}
+}
+
+func TestClone(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	nl := l.Clone(logger.WithLevel(logger.ErrorLevel))
+	if err := nl.Init(); err != nil {
+		t.Fatal(err)
+	}
+	nl.Info(ctx, "info message")
+	if len(buf.Bytes()) != 0 {
+		t.Fatal("message must not be logged")
+	}
+	l.Info(ctx, "info message")
+	if len(buf.Bytes()) == 0 {
+		t.Fatal("message must be logged")
+	}
+}
+
+func TestRedirectStdLogger(t *testing.T) {
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.ErrorLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	fn := logger.RedirectStdLogger(l, logger.ErrorLevel)
+	defer fn()
+	log.Print("test")
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"error"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"test"`))) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+}
+
+func TestStdLogger(t *testing.T) {
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	lg := logger.NewStdLogger(l, logger.ErrorLevel)
+	lg.Print("test")
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"error"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"test"`))) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
+	}
+}
+
+func TestLogger(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	l.Trace(ctx, "trace_msg1")
+	l.Warn(ctx, "warn_msg1")
+	l.Fields("error", "test").Info(ctx, "error message")
+	l.Warn(ctx, "first second")
+
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"trace"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"trace_msg1"`))) {
+		t.Fatalf("logger tracer, buf %s", buf.Bytes())
+	}
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"warn"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"warn_msg1"`))) {
+		t.Fatalf("logger warn, buf %s", buf.Bytes())
+	}
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"info"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"error message","error":"test"`))) {
+		t.Fatalf("logger info, buf %s", buf.Bytes())
+	}
+	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"warn"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"first second"`))) {
+		t.Fatalf("logger warn, buf %s", buf.Bytes())
+	}
+}

logger/unwrap/unwrap.go

@@ -46,13 +46,21 @@ var (
 	closeMapBytes      = []byte("}")
 )
 
-type unwrap struct {
-	val            interface{}
-	s              fmt.State
-	pointers       map[uintptr]int
-	opts           *Options
-	depth          int
-	ignoreNextType bool
+type protoMessage interface {
+	Reset()
+	ProtoMessage()
+}
+
+type Wrapper struct {
+	val              interface{}
+	s                fmt.State
+	pointers         map[uintptr]int
+	opts             *Options
+	depth            int
+	ignoreNextType   bool
+	takeMap          map[int]bool
+	protoWrapperType bool
+	sqlWrapperType   bool
 }
 
 // Options struct
@@ -106,14 +114,14 @@ func Tagged(b bool) Option {
 	}
 }
 
-func Unwrap(val interface{}, opts ...Option) *unwrap {
+func Unwrap(val interface{}, opts ...Option) *Wrapper {
 	options := NewOptions(opts...)
-	return &unwrap{val: val, opts: &options, pointers: make(map[uintptr]int)}
+	return &Wrapper{val: val, opts: &options, pointers: make(map[uintptr]int), takeMap: make(map[int]bool)}
 }
 
-func (f *unwrap) unpackValue(v reflect.Value) reflect.Value {
+func (w *Wrapper) unpackValue(v reflect.Value) reflect.Value {
 	if v.Kind() == reflect.Interface {
-		f.ignoreNextType = false
+		w.ignoreNextType = false
 		if !v.IsNil() {
 			v = v.Elem()
 		}
@@ -122,19 +130,19 @@ func (f *unwrap) unpackValue(v reflect.Value) reflect.Value {
 }
 
 // formatPtr handles formatting of pointers by indirecting them as necessary.
-func (f *unwrap) formatPtr(v reflect.Value) {
+func (w *Wrapper) 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)
+	showTypes := w.s.Flag('#')
+	if v.IsNil() && (!showTypes || w.ignoreNextType) {
+		_, _ = w.s.Write(nilAngleBytes)
 		return
 	}
 
 	// Remove pointers at or below the current depth from map used to detect
 	// circular refs.
-	for k, depth := range f.pointers {
-		if depth >= f.depth {
-			delete(f.pointers, k)
+	for k, depth := range w.pointers {
+		if depth >= w.depth {
+			delete(w.pointers, k)
 		}
 	}
 
@@ -156,12 +164,12 @@ func (f *unwrap) formatPtr(v reflect.Value) {
 		indirects++
 		addr := ve.Pointer()
 		pointerChain = append(pointerChain, addr)
-		if pd, ok := f.pointers[addr]; ok && pd < f.depth {
+		if pd, ok := w.pointers[addr]; ok && pd < w.depth {
 			cycleFound = true
 			indirects--
 			break
 		}
-		f.pointers[addr] = f.depth
+		w.pointers[addr] = w.depth
 
 		ve = ve.Elem()
 		if ve.Kind() == reflect.Interface {
@@ -174,49 +182,49 @@ func (f *unwrap) formatPtr(v reflect.Value) {
 	}
 
 	// Display type or indirection level depending on flags.
-	if showTypes && !f.ignoreNextType {
-		if f.depth > 0 {
-			_, _ = f.s.Write(openParenBytes)
+	if showTypes && !w.ignoreNextType {
+		if w.depth > 0 {
+			_, _ = w.s.Write(openParenBytes)
 		}
-		if f.depth > 0 {
-			_, _ = f.s.Write(bytes.Repeat(asteriskBytes, indirects))
+		if w.depth > 0 {
+			_, _ = w.s.Write(bytes.Repeat(asteriskBytes, indirects))
 		} else {
-			_, _ = f.s.Write(bytes.Repeat(ampBytes, indirects))
+			_, _ = w.s.Write(bytes.Repeat(ampBytes, indirects))
 		}
-		_, _ = f.s.Write([]byte(ve.Type().String()))
-		if f.depth > 0 {
-			_, _ = f.s.Write(closeParenBytes)
+		_, _ = w.s.Write([]byte(ve.Type().String()))
+		if w.depth > 0 {
+			_, _ = w.s.Write(closeParenBytes)
 		}
 	} else {
 		if nilFound || cycleFound {
 			indirects += strings.Count(ve.Type().String(), "*")
 		}
-		_, _ = f.s.Write(openAngleBytes)
-		_, _ = f.s.Write([]byte(strings.Repeat("*", indirects)))
-		_, _ = f.s.Write(closeAngleBytes)
+		_, _ = w.s.Write(openAngleBytes)
+		_, _ = w.s.Write([]byte(strings.Repeat("*", indirects)))
+		_, _ = w.s.Write(closeAngleBytes)
 	}
 
 	// Display pointer information depending on flags.
-	if f.s.Flag('+') && (len(pointerChain) > 0) {
-		_, _ = f.s.Write(openParenBytes)
+	if w.s.Flag('+') && (len(pointerChain) > 0) {
+		_, _ = w.s.Write(openParenBytes)
 		for i, addr := range pointerChain {
 			if i > 0 {
-				_, _ = f.s.Write(pointerChainBytes)
+				_, _ = w.s.Write(pointerChainBytes)
 			}
-			getHexPtr(f.s, addr)
+			getHexPtr(w.s, addr)
 		}
-		_, _ = f.s.Write(closeParenBytes)
+		_, _ = w.s.Write(closeParenBytes)
 	}
 
 	// Display dereferenced value.
 	switch {
 	case nilFound:
-		_, _ = f.s.Write(nilAngleBytes)
+		_, _ = w.s.Write(nilAngleBytes)
 	case cycleFound:
-		_, _ = f.s.Write(circularShortBytes)
+		_, _ = w.s.Write(circularShortBytes)
 	default:
-		f.ignoreNextType = true
-		f.format(ve)
+		w.ignoreNextType = true
+		w.format(ve)
 	}
 }
 
@@ -224,54 +232,73 @@ func (f *unwrap) formatPtr(v reflect.Value) {
 // 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())
+func (w *Wrapper) format(v reflect.Value) {
+	if w.opts.Codec != nil {
+		buf, err := w.opts.Codec.Marshal(v.Interface())
 		if err != nil {
-			_, _ = f.s.Write(invalidAngleBytes)
+			_, _ = w.s.Write(invalidAngleBytes)
 			return
 		}
-		_, _ = f.s.Write(buf)
+		_, _ = w.s.Write(buf)
 		return
 	}
+
 	// Handle invalid reflect values immediately.
 	kind := v.Kind()
 	if kind == reflect.Invalid {
-		_, _ = f.s.Write(invalidAngleBytes)
+		_, _ = w.s.Write(invalidAngleBytes)
 		return
 	}
 
 	// Handle pointers specially.
-	if kind == reflect.Ptr {
-		f.formatPtr(v)
+	switch kind {
+	case reflect.Ptr:
+		if !v.IsZero() {
+			if strings.HasPrefix(reflect.Indirect(v).Type().String(), "wrapperspb.") {
+				w.protoWrapperType = true
+			} else if strings.HasPrefix(reflect.Indirect(v).Type().String(), "sql.Null") {
+				w.sqlWrapperType = true
+			} else if v.CanInterface() {
+				if _, ok := v.Interface().(protoMessage); ok {
+					w.protoWrapperType = true
+				}
+			}
+		}
+		w.formatPtr(v)
 		return
+	case reflect.Struct:
+		if !v.IsZero() {
+			if strings.HasPrefix(reflect.Indirect(v).Type().String(), "sql.Null") {
+				w.sqlWrapperType = true
+			}
+		}
 	}
 
 	// get type information unless already handled elsewhere.
-	if !f.ignoreNextType && f.s.Flag('#') {
+	if !w.ignoreNextType && w.s.Flag('#') {
 		if v.Type().Kind() != reflect.Map &&
 			v.Type().Kind() != reflect.String &&
 			v.Type().Kind() != reflect.Array &&
 			v.Type().Kind() != reflect.Slice {
-			_, _ = f.s.Write(openParenBytes)
+			_, _ = w.s.Write(openParenBytes)
 		}
 		if v.Kind() != reflect.String {
-			_, _ = f.s.Write([]byte(v.Type().String()))
+			_, _ = w.s.Write([]byte(v.Type().String()))
 		}
 		if v.Type().Kind() != reflect.Map &&
 			v.Type().Kind() != reflect.String &&
 			v.Type().Kind() != reflect.Array &&
 			v.Type().Kind() != reflect.Slice {
-			_, _ = f.s.Write(closeParenBytes)
+			_, _ = w.s.Write(closeParenBytes)
 		}
 	}
-	f.ignoreNextType = false
+	w.ignoreNextType = false
 
 	// Call Stringer/error interfaces if they exist and the handle methods
 	// flag is enabled.
-	if f.opts.Methods {
+	if w.opts.Methods {
 		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
-			if handled := handleMethods(f.opts, f.s, v); handled {
+			if handled := handleMethods(w.opts, w.s, v); handled {
 				return
 			}
 		}
@@ -279,48 +306,48 @@ func (f *unwrap) format(v reflect.Value) {
 
 	switch kind {
 	case reflect.Invalid:
-		_, _ = f.s.Write(invalidAngleBytes)
+		_, _ = w.s.Write(invalidAngleBytes)
 	case reflect.Bool:
-		getBool(f.s, v.Bool())
+		getBool(w.s, v.Bool())
 	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
-		getInt(f.s, v.Int(), 10)
+		getInt(w.s, v.Int(), 10)
 	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
-		getUint(f.s, v.Uint(), 10)
+		getUint(w.s, v.Uint(), 10)
 	case reflect.Float32:
-		getFloat(f.s, v.Float(), 32)
+		getFloat(w.s, v.Float(), 32)
 	case reflect.Float64:
-		getFloat(f.s, v.Float(), 64)
+		getFloat(w.s, v.Float(), 64)
 	case reflect.Complex64:
-		getComplex(f.s, v.Complex(), 32)
+		getComplex(w.s, v.Complex(), 32)
 	case reflect.Complex128:
-		getComplex(f.s, v.Complex(), 64)
+		getComplex(w.s, v.Complex(), 64)
 	case reflect.Slice:
 		if v.IsNil() {
-			_, _ = f.s.Write(nilAngleBytes)
+			_, _ = w.s.Write(nilAngleBytes)
 			break
 		}
 		fallthrough
 	case reflect.Array:
-		_, _ = f.s.Write(openBraceBytes)
-		f.depth++
+		_, _ = w.s.Write(openBraceBytes)
+		w.depth++
 		numEntries := v.Len()
 		for i := 0; i < numEntries; i++ {
 			if i > 0 {
-				_, _ = f.s.Write(commaBytes)
-				_, _ = f.s.Write(spaceBytes)
+				_, _ = w.s.Write(commaBytes)
+				_, _ = w.s.Write(spaceBytes)
 			}
-			f.ignoreNextType = true
-			f.format(f.unpackValue(v.Index(i)))
+			w.ignoreNextType = true
+			w.format(w.unpackValue(v.Index(i)))
 		}
-		f.depth--
-		_, _ = f.s.Write(closeBraceBytes)
+		w.depth--
+		_, _ = w.s.Write(closeBraceBytes)
 	case reflect.String:
-		_, _ = f.s.Write([]byte(`"` + v.String() + `"`))
+		_, _ = w.s.Write([]byte(`"` + v.String() + `"`))
 	case reflect.Interface:
 		// The only time we should get here is for nil interfaces due to
 		// unpackValue calls.
 		if v.IsNil() {
-			_, _ = f.s.Write(nilAngleBytes)
+			_, _ = w.s.Write(nilAngleBytes)
 		}
 	case reflect.Ptr:
 		// Do nothing.  We should never get here since pointers have already
@@ -328,34 +355,54 @@ func (f *unwrap) format(v reflect.Value) {
 	case reflect.Map:
 		// nil maps should be indicated as different than empty maps
 		if v.IsNil() {
-			_, _ = f.s.Write(nilAngleBytes)
+			_, _ = w.s.Write(nilAngleBytes)
 			break
 		}
-		_, _ = f.s.Write(openMapBytes)
-		f.depth++
+		_, _ = w.s.Write(openMapBytes)
+		w.depth++
 		keys := v.MapKeys()
 		for i, key := range keys {
 			if i > 0 {
-				_, _ = f.s.Write(spaceBytes)
+				_, _ = w.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)))
+			w.ignoreNextType = true
+			w.format(w.unpackValue(key))
+			_, _ = w.s.Write(colonBytes)
+			w.ignoreNextType = true
+			w.format(w.unpackValue(v.MapIndex(key)))
 		}
-		f.depth--
-		_, _ = f.s.Write(closeMapBytes)
+		w.depth--
+		_, _ = w.s.Write(closeMapBytes)
 	case reflect.Struct:
+
 		numFields := v.NumField()
 		numWritten := 0
-		_, _ = f.s.Write(openBraceBytes)
-		f.depth++
+		_, _ = w.s.Write(openBraceBytes)
+		w.depth++
+
 		vt := v.Type()
 		prevSkip := false
+
 		for i := 0; i < numFields; i++ {
+			switch vt.Field(i).Type.PkgPath() {
+			case "google.golang.org/protobuf/internal/impl", "google.golang.org/protobuf/internal/pragma":
+				w.protoWrapperType = true
+				prevSkip = true
+				continue
+			}
+			if w.protoWrapperType && !vt.Field(i).IsExported() {
+				prevSkip = true
+				continue
+			} else if w.sqlWrapperType && vt.Field(i).Name == "Valid" {
+				prevSkip = true
+				continue
+			}
+			if _, ok := vt.Field(i).Tag.Lookup("protobuf"); ok && !w.protoWrapperType {
+				w.protoWrapperType = true
+			}
 			sv, ok := vt.Field(i).Tag.Lookup("logger")
-			if ok {
+			switch {
+			case ok:
 				switch sv {
 				case "omit":
 					prevSkip = true
@@ -363,57 +410,68 @@ func (f *unwrap) format(v reflect.Value) {
 				case "take":
 					break
 				}
-			} else if f.opts.Tagged {
-				prevSkip = true
-				continue
-			}
-			if i > 0 && !prevSkip {
-				_, _ = f.s.Write(commaBytes)
-				_, _ = f.s.Write(spaceBytes)
+			case !ok && w.opts.Tagged:
+				// skip top level untagged
+				if w.depth == 1 {
+					prevSkip = true
+					continue
+				}
+				if tv, ok := w.takeMap[w.depth]; ok && !tv {
+					prevSkip = true
+					continue
+				}
 			}
+
 			if prevSkip {
 				prevSkip = false
 			}
-			vtf := vt.Field(i)
-			if f.s.Flag('+') || f.s.Flag('#') {
-				_, _ = f.s.Write([]byte(vtf.Name))
-				_, _ = f.s.Write(colonBytes)
+
+			if numWritten > 0 {
+				_, _ = w.s.Write(commaBytes)
+				_, _ = w.s.Write(spaceBytes)
 			}
-			f.format(f.unpackValue(v.Field(i)))
+
+			vt := vt.Field(i)
+			if w.s.Flag('+') || w.s.Flag('#') {
+				_, _ = w.s.Write([]byte(vt.Name))
+				_, _ = w.s.Write(colonBytes)
+			}
+			w.format(w.unpackValue(v.Field(i)))
 			numWritten++
 		}
-		f.depth--
-		if numWritten == 0 && f.depth < 0 {
-			_, _ = f.s.Write(filteredBytes)
+		w.depth--
+
+		if numWritten == 0 && w.depth < 0 {
+			_, _ = w.s.Write(filteredBytes)
 		}
-		_, _ = f.s.Write(closeBraceBytes)
+		_, _ = w.s.Write(closeBraceBytes)
 	case reflect.Uintptr:
-		getHexPtr(f.s, uintptr(v.Uint()))
+		getHexPtr(w.s, uintptr(v.Uint()))
 	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
-		getHexPtr(f.s, v.Pointer())
+		getHexPtr(w.s, v.Pointer())
 	// There were not any other types at the time this code was written, but
 	// fall back to letting the default fmt package handle it if any get added.
 	default:
-		format := f.buildDefaultFormat()
+		format := w.buildDefaultFormat()
 		if v.CanInterface() {
-			_, _ = fmt.Fprintf(f.s, format, v.Interface())
+			_, _ = fmt.Fprintf(w.s, format, v.Interface())
 		} else {
-			_, _ = fmt.Fprintf(f.s, format, v.String())
+			_, _ = fmt.Fprintf(w.s, format, v.String())
 		}
 	}
 }
 
-func (f *unwrap) Format(s fmt.State, verb rune) {
-	f.s = s
+func (w *Wrapper) Format(s fmt.State, verb rune) {
+	w.s = s
 
 	// Use standard formatting for verbs that are not v.
 	if verb != 'v' {
-		format := f.constructOrigFormat(verb)
-		_, _ = fmt.Fprintf(s, format, f.val)
+		format := w.constructOrigFormat(verb)
+		_, _ = fmt.Fprintf(s, format, w.val)
 		return
 	}
 
-	if f.val == nil {
+	if w.val == nil {
 		if s.Flag('#') {
 			_, _ = s.Write(interfaceBytes)
 		}
@@ -421,7 +479,11 @@ func (f *unwrap) Format(s fmt.State, verb rune) {
 		return
 	}
 
-	f.format(reflect.ValueOf(f.val))
+	if w.opts.Tagged {
+		w.buildTakeMap(reflect.ValueOf(w.val), 1)
+	}
+
+	w.format(reflect.ValueOf(w.val))
 }
 
 // handle special methods like error.Error() or fmt.Stringer interface
@@ -537,11 +599,11 @@ func catchPanic(w io.Writer, _ reflect.Value) {
 	}
 }
 
-func (f *unwrap) buildDefaultFormat() (format string) {
+func (w *Wrapper) buildDefaultFormat() (format string) {
 	buf := bytes.NewBuffer(percentBytes)
 
 	for _, flag := range sf {
-		if f.s.Flag(int(flag)) {
+		if w.s.Flag(int(flag)) {
 			_, _ = buf.WriteRune(flag)
 		}
 	}
@@ -552,26 +614,68 @@ func (f *unwrap) buildDefaultFormat() (format string) {
 	return format
 }
 
-func (f *unwrap) constructOrigFormat(verb rune) (format string) {
+func (w *Wrapper) constructOrigFormat(verb rune) string {
 	buf := bytes.NewBuffer(percentBytes)
 
 	for _, flag := range sf {
-		if f.s.Flag(int(flag)) {
+		if w.s.Flag(int(flag)) {
 			_, _ = buf.WriteRune(flag)
 		}
 	}
 
-	if width, ok := f.s.Width(); ok {
+	if width, ok := w.s.Width(); ok {
 		_, _ = buf.WriteString(strconv.Itoa(width))
 	}
 
-	if precision, ok := f.s.Precision(); ok {
+	if precision, ok := w.s.Precision(); ok {
 		_, _ = buf.Write(precisionBytes)
 		_, _ = buf.WriteString(strconv.Itoa(precision))
 	}
 
 	_, _ = buf.WriteRune(verb)
 
-	format = buf.String()
-	return format
+	return buf.String()
+}
+
+func (w *Wrapper) buildTakeMap(v reflect.Value, depth int) {
+	if !v.IsValid() || v.IsZero() {
+		return
+	}
+
+	switch v.Kind() {
+	case reflect.Slice, reflect.Array:
+		for i := 0; i < v.Len(); i++ {
+			w.buildTakeMap(v.Index(i), depth+1)
+		}
+		w.takeMap[depth] = true
+		return
+	case reflect.Struct:
+		break
+	case reflect.Ptr:
+		v = v.Elem()
+		if v.Kind() != reflect.Struct {
+			w.takeMap[depth] = true
+			return
+		}
+	default:
+		w.takeMap[depth] = true
+		return
+	}
+
+	vt := v.Type()
+
+	for i := 0; i < v.NumField(); i++ {
+		sv, ok := vt.Field(i).Tag.Lookup("logger")
+		if ok && sv == "take" {
+			w.takeMap[depth] = false
+		}
+		if v.Kind() == reflect.Struct ||
+			(v.Kind() == reflect.Ptr && v.Elem().Kind() == reflect.Struct) {
+			w.buildTakeMap(v.Field(i), depth+1)
+		}
+	}
+
+	if _, ok := w.takeMap[depth]; !ok {
+		w.takeMap[depth] = true
+	}
 }

logger/unwrap/unwrap_test.go

@@ -86,12 +86,12 @@ func TestTaggedNested(t *testing.T) {
 		unk string
 	}
 	type str struct {
-		val *val   `logger:"take"`
 		key string `logger:"omit"`
+		val *val   `logger:"take"`
 	}
 
 	var iface interface{}
-	v := &str{key: "omit", val: &val{key: "test", val: "omit", unk: "unk"}}
+	v := &str{val: &val{key: "test", unk: "unk"}}
 	iface = v
 	buf := fmt.Sprintf("%#v", Unwrap(iface, Tagged(true)))
 	if strings.Compare(buf, `&unwrap.str{val:(*unwrap.val){key:"test"}}`) != 0 {

logger/wrapper.go

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

metadata/context.go

@@ -39,8 +39,6 @@ func FromOutgoingContext(ctx context.Context) (Metadata, bool) {
 
 // FromContext returns metadata from the given context
 // returned metadata shoud not be modified or race condition happens
-//
-// Deprecated: use FromIncomingContext or FromOutgoingContext
 func FromContext(ctx context.Context) (Metadata, bool) {
 	if ctx == nil {
 		return nil, false
@@ -53,8 +51,6 @@ func FromContext(ctx context.Context) (Metadata, bool) {
 }
 
 // NewContext creates a new context with the given metadata
-//
-// Deprecated: use NewIncomingContext or NewOutgoingContext
 func NewContext(ctx context.Context, md Metadata) context.Context {
 	if ctx == nil {
 		ctx = context.Background()

metadata/metadata.go

@@ -19,6 +19,8 @@ var (
 	HeaderTimeout = "Micro-Timeout"
 	// HeaderAuthorization specifies Authorization header
 	HeaderAuthorization = "Authorization"
+	// HeaderXRequestID specifies request id
+	HeaderXRequestID = "X-Request-Id"
 )
 
 // Metadata is our way of representing request headers internally.
@@ -96,11 +98,12 @@ func (md Metadata) Del(keys ...string) {
 }
 
 // Copy makes a copy of the metadata
-func Copy(md Metadata) Metadata {
+func Copy(md Metadata, exclude ...string) Metadata {
 	nmd := New(len(md))
 	for key, val := range md {
 		nmd.Set(key, val)
 	}
+	nmd.Del(exclude...)
 	return nmd
 }
 

metadata/metadata_test.go

@@ -190,3 +190,14 @@ func TestMetadataContext(t *testing.T) {
 		t.Errorf("Expected metadata length 1 got %d", i)
 	}
 }
+
+func TestCopy(t *testing.T) {
+	md := New(2)
+	md.Set("key1", "val1", "key2", "val2")
+	nmd := Copy(md, "key2")
+	if len(nmd) != 1 {
+		t.Fatal("Copy exclude not works")
+	} else if nmd["Key1"] != "val1" {
+		t.Fatal("Copy exclude not works")
+	}
+}

meter/generate.go

@@ -1,12 +0,0 @@
-package meter
-
-//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
-	_ "go.unistack.org/micro-proto/v3/api"
-
-	// import required packages
-	_ "go.unistack.org/micro-proto/v3/openapiv3"
-)

meter/handler/handler.go

@@ -1,67 +0,0 @@
-package handler // import "go.unistack.org/micro/v3/meter/handler"
-
-import (
-	"bytes"
-	"context"
-
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/errors"
-	"go.unistack.org/micro/v3/meter"
-)
-
-// guard to fail early
-var _ MeterServer = &Handler{}
-
-type Handler struct {
-	opts Options
-}
-
-type Option func(*Options)
-
-type Options struct {
-	Meter        meter.Meter
-	Name         string
-	MeterOptions []meter.Option
-}
-
-func Meter(m meter.Meter) Option {
-	return func(o *Options) {
-		o.Meter = m
-	}
-}
-
-func Name(name string) Option {
-	return func(o *Options) {
-		o.Name = name
-	}
-}
-
-func MeterOptions(opts ...meter.Option) Option {
-	return func(o *Options) {
-		o.MeterOptions = append(o.MeterOptions, opts...)
-	}
-}
-
-func NewOptions(opts ...Option) Options {
-	options := Options{Meter: meter.DefaultMeter}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-func NewHandler(opts ...Option) *Handler {
-	options := NewOptions(opts...)
-	return &Handler{opts: options}
-}
-
-func (h *Handler) Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
-	buf := bytes.NewBuffer(nil)
-	if err := h.opts.Meter.Write(buf, h.opts.MeterOptions...); err != nil {
-		return errors.InternalServerError(h.opts.Name, "%v", err)
-	}
-
-	rsp.Data = buf.Bytes()
-
-	return nil
-}

meter/handler/handler.proto

@@ -1,24 +0,0 @@
-syntax = "proto3";
-
-package micro.meter.handler;
-option go_package = "go.unistack.org/micro/v3/meter/handler;handler";
-
-import "api/annotations.proto";
-import "openapiv3/annotations.proto";
-import "codec/frame.proto";
-
-service Meter {
-	rpc Metrics(micro.codec.Frame) returns (micro.codec.Frame) {
-		option (micro.openapiv3.openapiv3_operation) = {
-      operation_id: "Metrics";
-      responses: {
-        default: {
-          reference: {
-            _ref: "micro.codec.Frame";
-          };
-        };
-      };
-    };
-		option (micro.api.http) = { get: "/metrics"; };
-  };
-};

meter/handler/handler_micro.pb.go

@@ -1,32 +0,0 @@
-// Code generated by protoc-gen-go-micro. DO NOT EDIT.
-// 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"
-)
-
-var (
-	MeterName = "Meter"
-
-	MeterEndpoints = []api.Endpoint{
-		{
-			Name:    "Meter.Metrics",
-			Path:    []string{"/metrics"},
-			Method:  []string{"GET"},
-			Handler: "rpc",
-		},
-	}
-)
-
-func NewMeterEndpoints() []api.Endpoint {
-	return MeterEndpoints
-}
-
-type MeterServer interface {
-	Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
-}

meter/handler/handler_micro_http.pb.go

@@ -1,35 +0,0 @@
-// Code generated by protoc-gen-go-micro. DO NOT EDIT.
-// 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"
-)
-
-type meterServer struct {
-	MeterServer
-}
-
-func (h *meterServer) Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
-	return h.MeterServer.Metrics(ctx, req, rsp)
-}
-
-func RegisterMeterServer(s server.Server, sh MeterServer, opts ...server.HandlerOption) error {
-	type meter interface {
-		Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
-	}
-	type Meter struct {
-		meter
-	}
-	h := &meterServer{sh}
-	var nopts []server.HandlerOption
-	for _, endpoint := range MeterEndpoints {
-		nopts = append(nopts, api.WithEndpoint(&endpoint))
-	}
-	return s.Handle(s.NewHandler(&Meter{h}, append(nopts, opts...)...))
-}

meter/meter.go

@@ -1,5 +1,5 @@
 // Package meter is for instrumentation
-package meter // import "go.unistack.org/micro/v3/meter"
+package meter
 
 import (
 	"io"
@@ -11,7 +11,7 @@ import (
 
 var (
 	// DefaultMeter is the default meter
-	DefaultMeter = NewMeter()
+	DefaultMeter Meter = 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

micro.go

@@ -0,0 +1,94 @@
+package micro
+
+import (
+	"reflect"
+
+	"go.unistack.org/micro/v3/broker"
+	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v3/flow"
+	"go.unistack.org/micro/v3/fsm"
+	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v3/register"
+	"go.unistack.org/micro/v3/resolver"
+	"go.unistack.org/micro/v3/router"
+	"go.unistack.org/micro/v3/selector"
+	"go.unistack.org/micro/v3/server"
+	"go.unistack.org/micro/v3/store"
+	"go.unistack.org/micro/v3/sync"
+	"go.unistack.org/micro/v3/tracer"
+)
+
+func As(b any, target any) bool {
+	if b == nil {
+		return false
+	}
+	if target == nil {
+		return false
+	}
+	val := reflect.ValueOf(target)
+	typ := val.Type()
+	if typ.Kind() != reflect.Ptr || val.IsNil() {
+		return false
+	}
+	targetType := typ.Elem()
+	if targetType.Kind() != reflect.Interface {
+		switch {
+		case targetType.Implements(brokerType):
+			break
+		case targetType.Implements(loggerType):
+			break
+		case targetType.Implements(clientType):
+			break
+		case targetType.Implements(serverType):
+			break
+		case targetType.Implements(codecType):
+			break
+		case targetType.Implements(flowType):
+			break
+		case targetType.Implements(fsmType):
+			break
+		case targetType.Implements(meterType):
+			break
+		case targetType.Implements(registerType):
+			break
+		case targetType.Implements(resolverType):
+			break
+		case targetType.Implements(selectorType):
+			break
+		case targetType.Implements(storeType):
+			break
+		case targetType.Implements(syncType):
+			break
+		case targetType.Implements(serviceType):
+			break
+		case targetType.Implements(routerType):
+			break
+		default:
+			return false
+		}
+	}
+	if reflect.TypeOf(b).AssignableTo(targetType) {
+		val.Elem().Set(reflect.ValueOf(b))
+		return true
+	}
+	return false
+}
+
+var brokerType = reflect.TypeOf((*broker.Broker)(nil)).Elem()
+var loggerType = reflect.TypeOf((*logger.Logger)(nil)).Elem()
+var clientType = reflect.TypeOf((*client.Client)(nil)).Elem()
+var serverType = reflect.TypeOf((*server.Server)(nil)).Elem()
+var codecType = reflect.TypeOf((*codec.Codec)(nil)).Elem()
+var flowType = reflect.TypeOf((*flow.Flow)(nil)).Elem()
+var fsmType = reflect.TypeOf((*fsm.FSM)(nil)).Elem()
+var meterType = reflect.TypeOf((*meter.Meter)(nil)).Elem()
+var registerType = reflect.TypeOf((*register.Register)(nil)).Elem()
+var resolverType = reflect.TypeOf((*resolver.Resolver)(nil)).Elem()
+var routerType = reflect.TypeOf((*router.Router)(nil)).Elem()
+var selectorType = reflect.TypeOf((*selector.Selector)(nil)).Elem()
+var storeType = reflect.TypeOf((*store.Store)(nil)).Elem()
+var syncType = reflect.TypeOf((*sync.Sync)(nil)).Elem()
+var tracerType = reflect.TypeOf((*tracer.Tracer)(nil)).Elem()
+var serviceType = reflect.TypeOf((*Service)(nil)).Elem()

micro_test.go

@@ -0,0 +1,115 @@
+package micro
+
+import (
+	"context"
+	"fmt"
+	"reflect"
+	"testing"
+
+	"go.unistack.org/micro/v3/broker"
+	"go.unistack.org/micro/v3/fsm"
+)
+
+func TestAs(t *testing.T) {
+	var b *bro
+	broTarget := &bro{name: "kafka"}
+	fsmTarget := &fsmT{name: "fsm"}
+
+	testCases := []struct {
+		b      any
+		target any
+		match  bool
+		want   any
+	}{
+		{
+			broTarget,
+			&b,
+			true,
+			broTarget,
+		},
+		{
+			nil,
+			&b,
+			false,
+			nil,
+		},
+		{
+			fsmTarget,
+			&b,
+			false,
+			nil,
+		},
+	}
+	for i, tc := range testCases {
+		name := fmt.Sprintf("%d:As(Errorf(..., %v), %v)", i, tc.b, tc.target)
+		// Clear the target pointer, in case it was set in a previous test.
+		rtarget := reflect.ValueOf(tc.target)
+		rtarget.Elem().Set(reflect.Zero(reflect.TypeOf(tc.target).Elem()))
+		t.Run(name, func(t *testing.T) {
+			match := As(tc.b, tc.target)
+			if match != tc.match {
+				t.Fatalf("match: got %v; want %v", match, tc.match)
+			}
+			if !match {
+				return
+			}
+			if got := rtarget.Elem().Interface(); got != tc.want {
+				t.Fatalf("got %#v, want %#v", got, tc.want)
+			}
+		})
+	}
+}
+
+type bro struct {
+	name string
+}
+
+func (p *bro) Name() string { return p.name }
+
+func (p *bro) Init(opts ...broker.Option) error { return nil }
+
+// Options returns broker options
+func (p *bro) Options() broker.Options { return broker.Options{} }
+
+// Address return configured address
+func (p *bro) Address() string { return "" }
+
+// Connect connects to broker
+func (p *bro) Connect(ctx context.Context) error { return nil }
+
+// Disconnect disconnect from broker
+func (p *bro) Disconnect(ctx context.Context) error { return nil }
+
+// Publish message, msg can be single broker.Message or []broker.Message
+func (p *bro) Publish(ctx context.Context, topic string, msg *broker.Message, opts ...broker.PublishOption) error {
+	return nil
+}
+
+// BatchPublish messages to broker with multiple topics
+func (p *bro) BatchPublish(ctx context.Context, msgs []*broker.Message, opts ...broker.PublishOption) error {
+	return nil
+}
+
+// BatchSubscribe subscribes to topic messages via handler
+func (p *bro) BatchSubscribe(ctx context.Context, topic string, h broker.BatchHandler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
+	return nil, nil
+}
+
+// Subscribe subscribes to topic message via handler
+func (p *bro) Subscribe(ctx context.Context, topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
+	return nil, nil
+}
+
+// String type of broker
+func (p *bro) String() string { return p.name }
+
+type fsmT struct {
+	name string
+}
+
+func (f *fsmT) Start(ctx context.Context, a interface{}, o ...Option) (interface{}, error) {
+	return nil, nil
+}
+func (f *fsmT) Current() string                  { return f.name }
+func (f *fsmT) Reset()                           {}
+func (f *fsmT) State(s string, sf fsm.StateFunc) {}

options.go

@@ -211,6 +211,7 @@ func Stores(s ...store.Store) Option {
 }
 
 // Logger set the logger to use
+//
 //nolint:gocyclo
 func Logger(l logger.Logger, opts ...LoggerOption) Option {
 	return func(o *Options) error {
@@ -329,6 +330,7 @@ func Meters(m ...meter.Meter) Option {
 
 // Register sets the register for the service
 // and the underlying components
+//
 //nolint:gocyclo
 func Register(r register.Register, opts ...RegisterOption) Option {
 	return func(o *Options) error {
@@ -403,6 +405,7 @@ func RegisterBroker(n string) RegisterOption {
 }
 
 // Tracer sets the tracer
+//
 //nolint:gocyclo
 func Tracer(t tracer.Tracer, opts ...TracerOption) Option {
 	return func(o *Options) error {

options/hooks.go

@@ -0,0 +1,31 @@
+package options
+
+// Hook func interface
+type Hook interface{}
+
+// Hooks func slice
+type Hooks []Hook
+
+// Append is used to add hooks
+func (hs *Hooks) Append(h ...Hook) {
+	*hs = append(*hs, h...)
+}
+
+// Replace is used to set hooks
+func (hs *Hooks) Replace(h ...Hook) {
+	*hs = h
+}
+
+// EachNext is used to itearate over hooks forward
+func (hs *Hooks) EachNext(fn func(Hook)) {
+	for idx := 0; idx < len(*hs); idx++ {
+		fn((*hs)[idx])
+	}
+}
+
+// EachPrev is used to iterate over hooks backward
+func (hs *Hooks) EachPrev(fn func(Hook)) {
+	for idx := len(*hs) - 1; idx >= 0; idx-- {
+		fn((*hs)[idx])
+	}
+}

options/hooks_test.go

@@ -0,0 +1,65 @@
+package options
+
+import "testing"
+
+func TestHooks_Append(t *testing.T) {
+	fn1 := func() {}
+	fn2 := func() {}
+	hs := &Hooks{}
+	hs.Append(fn1, fn2)
+	if len(*hs) != 2 {
+		t.Fatalf("unexpected Append error")
+	}
+}
+
+func TestHooks_Replace(t *testing.T) {
+	fn1 := func() {}
+	fn2 := func() {}
+	hs := &Hooks{}
+	hs.Append(fn1, fn2, fn1)
+	if len(*hs) != 3 {
+		t.Fatalf("unexpected Append error")
+	}
+	hs.Replace(fn1, fn2)
+	if len(*hs) != 2 {
+		t.Fatalf("unexpected Replace error")
+	}
+}
+
+func TestHooks_EachNext(t *testing.T) {
+	n := 5
+	fn1 := func() {
+		n *= 2
+	}
+	fn2 := func() {
+		n -= 10
+	}
+	hs := &Hooks{}
+	hs.Append(fn1, fn2)
+
+	hs.EachNext(func(h Hook) {
+		h.(func())()
+	})
+	if n != 0 {
+		t.Fatalf("unexpected EachNext")
+	}
+}
+
+func TestHooks_EachPrev(t *testing.T) {
+	n := 5
+	fn1 := func() {
+		n *= 2
+	}
+	fn2 := func() {
+		n -= 10
+	}
+	hs := &Hooks{}
+	hs.Append(fn2, fn1)
+
+	hs.EachPrev(func(h Hook) {
+		h.(func())()
+	})
+	if n != 0 {
+		t.Fatalf("unexpected EachPrev")
+	}
+}

register/memory/memory.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v3/register"
 	"go.unistack.org/micro/v3/util/id"
 )
 
@@ -16,7 +17,7 @@ var (
 
 type node struct {
 	LastSeen time.Time
-	*Node
+	*register.Node
 	TTL time.Duration
 }
 
@@ -25,23 +26,23 @@ type record struct {
 	Version   string
 	Metadata  map[string]string
 	Nodes     map[string]*node
-	Endpoints []*Endpoint
+	Endpoints []*register.Endpoint
 }
 
 type memory struct {
 	sync.RWMutex
 	records  map[string]services
 	watchers map[string]*watcher
-	opts     Options
+	opts     register.Options
 }
 
 // services is a KV map with service name as the key and a map of records as the value
 type services map[string]map[string]*record
 
 // NewRegister returns an initialized in-memory register
-func NewRegister(opts ...Option) Register {
+func NewRegister(opts ...register.Option) register.Register {
 	r := &memory{
-		opts:     NewOptions(opts...),
+		opts:     register.NewOptions(opts...),
 		records:  make(map[string]services),
 		watchers: make(map[string]*watcher),
 	}
@@ -75,7 +76,7 @@ func (m *memory) ttlPrune() {
 	}
 }
 
-func (m *memory) sendEvent(r *Result) {
+func (m *memory) sendEvent(r *register.Result) {
 	m.RLock()
 	watchers := make([]*watcher, 0, len(m.watchers))
 	for _, w := range m.watchers {
@@ -106,7 +107,7 @@ func (m *memory) Disconnect(ctx context.Context) error {
 	return nil
 }
 
-func (m *memory) Init(opts ...Option) error {
+func (m *memory) Init(opts ...register.Option) error {
 	for _, o := range opts {
 		o(&m.opts)
 	}
@@ -118,15 +119,15 @@ func (m *memory) Init(opts ...Option) error {
 	return nil
 }
 
-func (m *memory) Options() Options {
+func (m *memory) Options() register.Options {
 	return m.opts
 }
 
-func (m *memory) Register(ctx context.Context, s *Service, opts ...RegisterOption) error {
+func (m *memory) Register(ctx context.Context, s *register.Service, opts ...register.RegisterOption) error {
 	m.Lock()
 	defer m.Unlock()
 
-	options := NewRegisterOptions(opts...)
+	options := register.NewRegisterOptions(opts...)
 
 	// get the services for this domain from the register
 	srvs, ok := m.records[options.Domain]
@@ -153,7 +154,7 @@ func (m *memory) Register(ctx context.Context, s *Service, opts ...RegisterOptio
 			m.opts.Logger.Debugf(m.opts.Context, "Register added new service: %s, version: %s", s.Name, s.Version)
 		}
 		m.records[options.Domain] = srvs
-		go m.sendEvent(&Result{Action: "create", Service: s})
+		go m.sendEvent(&register.Result{Action: "create", Service: s})
 	}
 
 	var addedNodes bool
@@ -176,7 +177,7 @@ func (m *memory) Register(ctx context.Context, s *Service, opts ...RegisterOptio
 
 		// add the node
 		srvs[s.Name][s.Version].Nodes[n.ID] = &node{
-			Node: &Node{
+			Node: &register.Node{
 				ID:       n.ID,
 				Address:  n.Address,
 				Metadata: metadata,
@@ -192,7 +193,7 @@ func (m *memory) Register(ctx context.Context, s *Service, opts ...RegisterOptio
 		if m.opts.Logger.V(logger.DebugLevel) {
 			m.opts.Logger.Debugf(m.opts.Context, "Register added new node to service: %s, version: %s", s.Name, s.Version)
 		}
-		go m.sendEvent(&Result{Action: "update", Service: s})
+		go m.sendEvent(&register.Result{Action: "update", Service: s})
 	} else {
 		// refresh TTL and timestamp
 		for _, n := range s.Nodes {
@@ -208,11 +209,11 @@ func (m *memory) Register(ctx context.Context, s *Service, opts ...RegisterOptio
 	return nil
 }
 
-func (m *memory) Deregister(ctx context.Context, s *Service, opts ...DeregisterOption) error {
+func (m *memory) Deregister(ctx context.Context, s *register.Service, opts ...register.DeregisterOption) error {
 	m.Lock()
 	defer m.Unlock()
 
-	options := NewDeregisterOptions(opts...)
+	options := register.NewDeregisterOptions(opts...)
 
 	// domain is set in metadata so it can be passed to watchers
 	if s.Metadata == nil {
@@ -252,7 +253,7 @@ func (m *memory) Deregister(ctx context.Context, s *Service, opts ...DeregisterO
 	// is cleanup
 	if len(version.Nodes) > 0 {
 		m.records[options.Domain][s.Name][s.Version] = version
-		go m.sendEvent(&Result{Action: "update", Service: s})
+		go m.sendEvent(&register.Result{Action: "update", Service: s})
 		return nil
 	}
 
@@ -260,7 +261,7 @@ func (m *memory) Deregister(ctx context.Context, s *Service, opts ...DeregisterO
 	// register and exit
 	if len(versions) == 1 {
 		delete(m.records[options.Domain], s.Name)
-		go m.sendEvent(&Result{Action: "delete", Service: s})
+		go m.sendEvent(&register.Result{Action: "delete", Service: s})
 
 		if m.opts.Logger.V(logger.DebugLevel) {
 			m.opts.Logger.Debugf(m.opts.Context, "Register removed service: %s", s.Name)
@@ -270,7 +271,7 @@ func (m *memory) Deregister(ctx context.Context, s *Service, opts ...DeregisterO
 
 	// there are other versions of the service running, so only remove this version of it
 	delete(m.records[options.Domain][s.Name], s.Version)
-	go m.sendEvent(&Result{Action: "delete", Service: s})
+	go m.sendEvent(&register.Result{Action: "delete", Service: s})
 	if m.opts.Logger.V(logger.DebugLevel) {
 		m.opts.Logger.Debugf(m.opts.Context, "Register removed service: %s, version: %s", s.Name, s.Version)
 	}
@@ -278,20 +279,20 @@ func (m *memory) Deregister(ctx context.Context, s *Service, opts ...DeregisterO
 	return nil
 }
 
-func (m *memory) LookupService(ctx context.Context, name string, opts ...LookupOption) ([]*Service, error) {
-	options := NewLookupOptions(opts...)
+func (m *memory) LookupService(ctx context.Context, name string, opts ...register.LookupOption) ([]*register.Service, error) {
+	options := register.NewLookupOptions(opts...)
 
 	// if it's a wildcard domain, return from all domains
-	if options.Domain == WildcardDomain {
+	if options.Domain == register.WildcardDomain {
 		m.RLock()
 		recs := m.records
 		m.RUnlock()
 
-		var services []*Service
+		var services []*register.Service
 
 		for domain := range recs {
-			srvs, err := m.LookupService(ctx, name, append(opts, LookupDomain(domain))...)
-			if err == ErrNotFound {
+			srvs, err := m.LookupService(ctx, name, append(opts, register.LookupDomain(domain))...)
+			if err == register.ErrNotFound {
 				continue
 			} else if err != nil {
 				return nil, err
@@ -300,7 +301,7 @@ func (m *memory) LookupService(ctx context.Context, name string, opts ...LookupO
 		}
 
 		if len(services) == 0 {
-			return nil, ErrNotFound
+			return nil, register.ErrNotFound
 		}
 		return services, nil
 	}
@@ -311,17 +312,17 @@ func (m *memory) LookupService(ctx context.Context, name string, opts ...LookupO
 	// check the domain exists
 	services, ok := m.records[options.Domain]
 	if !ok {
-		return nil, ErrNotFound
+		return nil, register.ErrNotFound
 	}
 
 	// check the service exists
 	versions, ok := services[name]
 	if !ok || len(versions) == 0 {
-		return nil, ErrNotFound
+		return nil, register.ErrNotFound
 	}
 
 	// serialize the response
-	result := make([]*Service, len(versions))
+	result := make([]*register.Service, len(versions))
 
 	var i int
 
@@ -333,19 +334,19 @@ func (m *memory) LookupService(ctx context.Context, name string, opts ...LookupO
 	return result, nil
 }
 
-func (m *memory) ListServices(ctx context.Context, opts ...ListOption) ([]*Service, error) {
-	options := NewListOptions(opts...)
+func (m *memory) ListServices(ctx context.Context, opts ...register.ListOption) ([]*register.Service, error) {
+	options := register.NewListOptions(opts...)
 
 	// if it's a wildcard domain, list from all domains
-	if options.Domain == WildcardDomain {
+	if options.Domain == register.WildcardDomain {
 		m.RLock()
 		recs := m.records
 		m.RUnlock()
 
-		var services []*Service
+		var services []*register.Service
 
 		for domain := range recs {
-			srvs, err := m.ListServices(ctx, append(opts, ListDomain(domain))...)
+			srvs, err := m.ListServices(ctx, append(opts, register.ListDomain(domain))...)
 			if err != nil {
 				return nil, err
 			}
@@ -361,11 +362,11 @@ func (m *memory) ListServices(ctx context.Context, opts ...ListOption) ([]*Servi
 	// ensure the domain exists
 	services, ok := m.records[options.Domain]
 	if !ok {
-		return make([]*Service, 0), nil
+		return make([]*register.Service, 0), nil
 	}
 
 	// serialize the result, each version counts as an individual service
-	var result []*Service
+	var result []*register.Service
 
 	for _, service := range services {
 		for _, version := range service {
@@ -376,16 +377,16 @@ func (m *memory) ListServices(ctx context.Context, opts ...ListOption) ([]*Servi
 	return result, nil
 }
 
-func (m *memory) Watch(ctx context.Context, opts ...WatchOption) (Watcher, error) {
+func (m *memory) Watch(ctx context.Context, opts ...register.WatchOption) (register.Watcher, error) {
 	id, err := id.New()
 	if err != nil {
 		return nil, err
 	}
-	wo := NewWatchOptions(opts...)
+	wo := register.NewWatchOptions(opts...)
 	// construct the watcher
 	w := &watcher{
 		exit: make(chan bool),
-		res:  make(chan *Result),
+		res:  make(chan *register.Result),
 		id:   id,
 		wo:   wo,
 	}
@@ -406,13 +407,13 @@ func (m *memory) String() string {
 }
 
 type watcher struct {
-	res  chan *Result
+	res  chan *register.Result
 	exit chan bool
-	wo   WatchOptions
+	wo   register.WatchOptions
 	id   string
 }
 
-func (m *watcher) Next() (*Result, error) {
+func (m *watcher) Next() (*register.Result, error) {
 	for {
 		select {
 		case r := <-m.res:
@@ -429,15 +430,15 @@ func (m *watcher) Next() (*Result, error) {
 			if r.Service.Metadata != nil && len(r.Service.Metadata["domain"]) > 0 {
 				domain = r.Service.Metadata["domain"]
 			} else {
-				domain = DefaultDomain
+				domain = register.DefaultDomain
 			}
 
 			// only send the event if watching the wildcard or this specific domain
-			if m.wo.Domain == WildcardDomain || m.wo.Domain == domain {
+			if m.wo.Domain == register.WildcardDomain || m.wo.Domain == domain {
 				return r, nil
 			}
 		case <-m.exit:
-			return nil, ErrWatcherStopped
+			return nil, register.ErrWatcherStopped
 		}
 	}
 }
@@ -451,7 +452,7 @@ func (m *watcher) Stop() {
 	}
 }
 
-func serviceToRecord(s *Service, ttl time.Duration) *record {
+func serviceToRecord(s *register.Service, ttl time.Duration) *record {
 	metadata := make(map[string]string, len(s.Metadata))
 	for k, v := range s.Metadata {
 		metadata[k] = v
@@ -466,7 +467,7 @@ func serviceToRecord(s *Service, ttl time.Duration) *record {
 		}
 	}
 
-	endpoints := make([]*Endpoint, len(s.Endpoints))
+	endpoints := make([]*register.Endpoint, len(s.Endpoints))
 	for i, e := range s.Endpoints {
 		endpoints[i] = e
 	}
@@ -480,7 +481,7 @@ func serviceToRecord(s *Service, ttl time.Duration) *record {
 	}
 }
 
-func recordToService(r *record, domain string) *Service {
+func recordToService(r *record, domain string) *register.Service {
 	metadata := make(map[string]string, len(r.Metadata))
 	for k, v := range r.Metadata {
 		metadata[k] = v
@@ -489,14 +490,14 @@ func recordToService(r *record, domain string) *Service {
 	// set the domain in metadata so it can be determined when a wildcard query is performed
 	metadata["domain"] = domain
 
-	endpoints := make([]*Endpoint, len(r.Endpoints))
+	endpoints := make([]*register.Endpoint, len(r.Endpoints))
 	for i, e := range r.Endpoints {
 		md := make(map[string]string, len(e.Metadata))
 		for k, v := range e.Metadata {
 			md[k] = v
 		}
 
-		endpoints[i] = &Endpoint{
+		endpoints[i] = &register.Endpoint{
 			Name:     e.Name,
 			Request:  e.Request,
 			Response: e.Response,
@@ -504,7 +505,7 @@ func recordToService(r *record, domain string) *Service {
 		}
 	}
 
-	nodes := make([]*Node, len(r.Nodes))
+	nodes := make([]*register.Node, len(r.Nodes))
 	i := 0
 	for _, n := range r.Nodes {
 		md := make(map[string]string, len(n.Metadata))
@@ -512,7 +513,7 @@ func recordToService(r *record, domain string) *Service {
 			md[k] = v
 		}
 
-		nodes[i] = &Node{
+		nodes[i] = &register.Node{
 			ID:       n.ID,
 			Address:  n.Address,
 			Metadata: md,
@@ -520,7 +521,7 @@ func recordToService(r *record, domain string) *Service {
 		i++
 	}
 
-	return &Service{
+	return &register.Service{
 		Name:      r.Name,
 		Version:   r.Version,
 		Metadata:  metadata,

register/memory/memory_test.go

@@ -3,18 +3,19 @@ package register
 import (
 	"context"
 	"fmt"
-	"os"
 	"sync"
 	"testing"
 	"time"
+
+	"go.unistack.org/micro/v3/register"
 )
 
-var testData = map[string][]*Service{
+var testData = map[string][]*register.Service{
 	"foo": {
 		{
 			Name:    "foo",
 			Version: "1.0.0",
-			Nodes: []*Node{
+			Nodes: []*register.Node{
 				{
 					ID:      "foo-1.0.0-123",
 					Address: "localhost:9999",
@@ -28,7 +29,7 @@ var testData = map[string][]*Service{
 		{
 			Name:    "foo",
 			Version: "1.0.1",
-			Nodes: []*Node{
+			Nodes: []*register.Node{
 				{
 					ID:      "foo-1.0.1-321",
 					Address: "localhost:6666",
@@ -38,7 +39,7 @@ var testData = map[string][]*Service{
 		{
 			Name:    "foo",
 			Version: "1.0.3",
-			Nodes: []*Node{
+			Nodes: []*register.Node{
 				{
 					ID:      "foo-1.0.3-345",
 					Address: "localhost:8888",
@@ -50,7 +51,7 @@ var testData = map[string][]*Service{
 		{
 			Name:    "bar",
 			Version: "default",
-			Nodes: []*Node{
+			Nodes: []*register.Node{
 				{
 					ID:      "bar-1.0.0-123",
 					Address: "localhost:9999",
@@ -64,7 +65,7 @@ var testData = map[string][]*Service{
 		{
 			Name:    "bar",
 			Version: "latest",
-			Nodes: []*Node{
+			Nodes: []*register.Node{
 				{
 					ID:      "bar-1.0.1-321",
 					Address: "localhost:6666",
@@ -79,7 +80,7 @@ func TestMemoryRegistry(t *testing.T) {
 	ctx := context.TODO()
 	m := NewRegister()
 
-	fn := func(k string, v []*Service) {
+	fn := func(k string, v []*register.Service) {
 		services, err := m.LookupService(ctx, k)
 		if err != nil {
 			t.Errorf("Unexpected error getting service %s: %v", k, err)
@@ -156,8 +157,8 @@ func TestMemoryRegistry(t *testing.T) {
 	for _, v := range testData {
 		for _, service := range v {
 			services, err := m.LookupService(ctx, service.Name)
-			if err != ErrNotFound {
-				t.Errorf("Expected error: %v, got: %v", ErrNotFound, err)
+			if err != register.ErrNotFound {
+				t.Errorf("Expected error: %v, got: %v", register.ErrNotFound, err)
 			}
 			if len(services) != 0 {
 				t.Errorf("Expected %d services for %s, got %d", 0, service.Name, len(services))
@@ -172,7 +173,7 @@ func TestMemoryRegistryTTL(t *testing.T) {
 
 	for _, v := range testData {
 		for _, service := range v {
-			if err := m.Register(ctx, service, RegisterTTL(time.Millisecond)); err != nil {
+			if err := m.Register(ctx, service, register.RegisterTTL(time.Millisecond)); err != nil {
 				t.Fatal(err)
 			}
 		}
@@ -201,15 +202,15 @@ func TestMemoryRegistryTTLConcurrent(t *testing.T) {
 	ctx := context.TODO()
 	for _, v := range testData {
 		for _, service := range v {
-			if err := m.Register(ctx, service, RegisterTTL(waitTime/2)); err != nil {
+			if err := m.Register(ctx, service, register.RegisterTTL(waitTime/2)); err != nil {
 				t.Fatal(err)
 			}
 		}
 	}
 
-	if len(os.Getenv("IN_TRAVIS_CI")) == 0 {
-		t.Logf("test will wait %v, then check TTL timeouts", waitTime)
-	}
+	//if len(os.Getenv("IN_TRAVIS_CI")) == 0 {
+	//	t.Logf("test will wait %v, then check TTL timeouts", waitTime)
+	//}
 
 	errChan := make(chan error, concurrency)
 	syncChan := make(chan struct{})
@@ -250,34 +251,34 @@ func TestMemoryWildcard(t *testing.T) {
 	m := NewRegister()
 	ctx := context.TODO()
 
-	testSrv := &Service{Name: "foo", Version: "1.0.0"}
+	testSrv := &register.Service{Name: "foo", Version: "1.0.0"}
 
-	if err := m.Register(ctx, testSrv, RegisterDomain("one")); err != nil {
+	if err := m.Register(ctx, testSrv, register.RegisterDomain("one")); err != nil {
 		t.Fatalf("Register err: %v", err)
 	}
-	if err := m.Register(ctx, testSrv, RegisterDomain("two")); err != nil {
+	if err := m.Register(ctx, testSrv, register.RegisterDomain("two")); err != nil {
 		t.Fatalf("Register err: %v", err)
 	}
 
-	if recs, err := m.ListServices(ctx, ListDomain("one")); err != nil {
+	if recs, err := m.ListServices(ctx, register.ListDomain("one")); err != nil {
 		t.Errorf("List err: %v", err)
 	} else if len(recs) != 1 {
 		t.Errorf("Expected 1 record, got %v", len(recs))
 	}
 
-	if recs, err := m.ListServices(ctx, ListDomain("*")); err != nil {
+	if recs, err := m.ListServices(ctx, register.ListDomain("*")); err != nil {
 		t.Errorf("List err: %v", err)
 	} else if len(recs) != 2 {
 		t.Errorf("Expected 2 records, got %v", len(recs))
 	}
 
-	if recs, err := m.LookupService(ctx, testSrv.Name, LookupDomain("one")); err != nil {
+	if recs, err := m.LookupService(ctx, testSrv.Name, register.LookupDomain("one")); err != nil {
 		t.Errorf("Lookup err: %v", err)
 	} else if len(recs) != 1 {
 		t.Errorf("Expected 1 record, got %v", len(recs))
 	}
 
-	if recs, err := m.LookupService(ctx, testSrv.Name, LookupDomain("*")); err != nil {
+	if recs, err := m.LookupService(ctx, testSrv.Name, register.LookupDomain("*")); err != nil {
 		t.Errorf("Lookup err: %v", err)
 	} else if len(recs) != 2 {
 		t.Errorf("Expected 2 records, got %v", len(recs))
@@ -285,7 +286,7 @@ func TestMemoryWildcard(t *testing.T) {
 }
 
 func TestWatcher(t *testing.T) {
-	testSrv := &Service{Name: "foo", Version: "1.0.0"}
+	testSrv := &register.Service{Name: "foo", Version: "1.0.0"}
 
 	ctx := context.TODO()
 	m := NewRegister()

register/noop.go

@@ -0,0 +1,72 @@
+package register
+
+import "context"
+
+type noop struct {
+	opts Options
+}
+
+func NewRegister(opts ...Option) Register {
+	return &noop{
+		opts: NewOptions(opts...),
+	}
+}
+
+func (n *noop) Name() string {
+	return n.opts.Name
+}
+
+func (n *noop) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&n.opts)
+	}
+	return nil
+}
+
+func (n *noop) Options() Options {
+	return n.opts
+}
+
+func (n *noop) Connect(ctx context.Context) error {
+	return nil
+}
+
+func (n *noop) Disconnect(ctx context.Context) error {
+	return nil
+}
+
+func (n *noop) Register(ctx context.Context, service *Service, option ...RegisterOption) error {
+	return nil
+}
+
+func (n *noop) Deregister(ctx context.Context, service *Service, option ...DeregisterOption) error {
+	return nil
+}
+
+func (n *noop) LookupService(ctx context.Context, s string, option ...LookupOption) ([]*Service, error) {
+	return nil, nil
+}
+
+func (n *noop) ListServices(ctx context.Context, option ...ListOption) ([]*Service, error) {
+	return nil, nil
+}
+
+func (n *noop) Watch(ctx context.Context, opts ...WatchOption) (Watcher, error) {
+	wOpts := NewWatchOptions(opts...)
+
+	return &watcher{wo: wOpts}, nil
+}
+
+func (n *noop) String() string {
+	return "noop"
+}
+
+type watcher struct {
+	wo WatchOptions
+}
+
+func (m *watcher) Next() (*Result, error) {
+	return nil, nil
+}
+
+func (m *watcher) Stop() {}

register/register.go

@@ -18,7 +18,7 @@ var DefaultDomain = "micro"
 
 var (
 	// DefaultRegister is the global default register
-	DefaultRegister = NewRegister()
+	DefaultRegister Register = NewRegister()
 	// ErrNotFound returned when LookupService is called and no services found
 	ErrNotFound = errors.New("service not found")
 	// ErrWatcherStopped returned when when watcher is stopped

resolver/resolver.go

@@ -1,5 +1,5 @@
 // Package resolver resolves network names to addresses
-package resolver // import "go.unistack.org/micro/v3/resolver"
+package resolver
 
 // Resolver is network resolver. It's used to find network nodes
 // via the name to connect to. This is done based on Network.Name().

router/router.go

@@ -7,7 +7,7 @@ import (
 
 var (
 	// DefaultRouter is the global default router
-	DefaultRouter = NewRouter()
+	DefaultRouter Router = NewRouter()
 	// DefaultNetwork is default micro network
 	DefaultNetwork = "micro"
 	// ErrRouteNotFound is returned when no route was found in the routing table

semconv/broker.go

@@ -0,0 +1,22 @@
+package semconv
+
+var (
+	// PublishMessageDurationSeconds specifies meter metric name
+	PublishMessageDurationSeconds = "publish_message_duration_seconds"
+	// PublishMessageLatencyMicroseconds specifies meter metric name
+	PublishMessageLatencyMicroseconds = "publish_message_latency_microseconds"
+	// PublishMessageTotal specifies meter metric name
+	PublishMessageTotal = "publish_message_total"
+	// PublishMessageInflight specifies meter metric name
+	PublishMessageInflight = "publish_message_inflight"
+	// SubscribeMessageDurationSeconds specifies meter metric name
+	SubscribeMessageDurationSeconds = "subscribe_message_duration_seconds"
+	// SubscribeMessageLatencyMicroseconds specifies meter metric name
+	SubscribeMessageLatencyMicroseconds = "subscribe_message_latency_microseconds"
+	// SubscribeMessageTotal specifies meter metric name
+	SubscribeMessageTotal = "subscribe_message_total"
+	// SubscribeMessageInflight specifies meter metric name
+	SubscribeMessageInflight = "subscribe_message_inflight"
+	// BrokerGroupLag specifies broker lag
+	BrokerGroupLag = "broker_group_lag"
+)

semconv/cache.go

@@ -0,0 +1,12 @@
+package semconv
+
+var (
+	// CacheRequestDurationSeconds specifies meter metric name
+	CacheRequestDurationSeconds = "cache_request_duration_seconds"
+	// ClientRequestLatencyMicroseconds specifies meter metric name
+	CacheRequestLatencyMicroseconds = "cache_request_latency_microseconds"
+	// CacheRequestTotal specifies meter metric name
+	CacheRequestTotal = "cache_request_total"
+	// CacheRequestInflight specifies meter metric name
+	CacheRequestInflight = "cache_request_inflight"
+)

semconv/client.go

@@ -0,0 +1,12 @@
+package semconv
+
+var (
+	// ClientRequestDurationSeconds specifies meter metric name
+	ClientRequestDurationSeconds = "client_request_duration_seconds"
+	// ClientRequestLatencyMicroseconds specifies meter metric name
+	ClientRequestLatencyMicroseconds = "client_request_latency_microseconds"
+	// ClientRequestTotal specifies meter metric name
+	ClientRequestTotal = "client_request_total"
+	// ClientRequestInflight specifies meter metric name
+	ClientRequestInflight = "client_request_inflight"
+)

semconv/server.go

@@ -0,0 +1,12 @@
+package semconv
+
+var (
+	// ServerRequestDurationSeconds specifies meter metric name
+	ServerRequestDurationSeconds = "server_request_duration_seconds"
+	// ServerRequestLatencyMicroseconds specifies meter metric name
+	ServerRequestLatencyMicroseconds = "server_request_latency_microseconds"
+	// ServerRequestTotal specifies meter metric name
+	ServerRequestTotal = "server_request_total"
+	// ServerRequestInflight specifies meter metric name
+	ServerRequestInflight = "server_request_inflight"
+)

server/context.go

@@ -42,3 +42,13 @@ func SetSubscriberOption(k, v interface{}) SubscriberOption {
 		o.Context = context.WithValue(o.Context, k, v)
 	}
 }
+
+// SetHandlerOption returns a function to setup a context with given value
+func SetHandlerOption(k, v interface{}) HandlerOption {
+	return func(o *HandlerOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}

server/generate.go

@@ -1,12 +0,0 @@
-package server
-
-//go:generate sh -c "protoc -I./health -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:./health health/health.proto"
-
-import (
-
-	// import required packages
-	_ "go.unistack.org/micro-proto/v3/api"
-
-	// import required packages
-	_ "go.unistack.org/micro-proto/v3/openapiv3"
-)

server/handler.go

@@ -1,59 +0,0 @@
-package server
-
-import (
-	"reflect"
-
-	"go.unistack.org/micro/v3/register"
-)
-
-type rpcHandler struct {
-	opts      HandlerOptions
-	handler   interface{}
-	name      string
-	endpoints []*register.Endpoint
-}
-
-func newRPCHandler(handler interface{}, opts ...HandlerOption) Handler {
-	options := NewHandlerOptions(opts...)
-
-	typ := reflect.TypeOf(handler)
-	hdlr := reflect.ValueOf(handler)
-	name := reflect.Indirect(hdlr).Type().Name()
-
-	var endpoints []*register.Endpoint
-
-	for m := 0; m < typ.NumMethod(); m++ {
-		if e := register.ExtractEndpoint(typ.Method(m)); e != nil {
-			e.Name = name + "." + e.Name
-
-			for k, v := range options.Metadata[e.Name] {
-				e.Metadata[k] = v
-			}
-
-			endpoints = append(endpoints, e)
-		}
-	}
-
-	return &rpcHandler{
-		name:      name,
-		handler:   handler,
-		endpoints: endpoints,
-		opts:      options,
-	}
-}
-
-func (r *rpcHandler) Name() string {
-	return r.name
-}
-
-func (r *rpcHandler) Handler() interface{} {
-	return r.handler
-}
-
-func (r *rpcHandler) Endpoints() []*register.Endpoint {
-	return r.endpoints
-}
-
-func (r *rpcHandler) Options() HandlerOptions {
-	return r.opts
-}

server/health/health.go

@@ -1,82 +0,0 @@
-package health // import "go.unistack.org/micro/v3/server/health"
-
-import (
-	"context"
-
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/errors"
-)
-
-var _ HealthServer = &Handler{}
-
-type Handler struct {
-	opts Options
-}
-
-type CheckFunc func(context.Context) error
-
-type Option func(*Options)
-
-type Options struct {
-	Version     string
-	Name        string
-	LiveChecks  []CheckFunc
-	ReadyChecks []CheckFunc
-}
-
-func LiveChecks(fns ...CheckFunc) Option {
-	return func(o *Options) {
-		o.LiveChecks = append(o.LiveChecks, fns...)
-	}
-}
-
-func ReadyChecks(fns ...CheckFunc) Option {
-	return func(o *Options) {
-		o.ReadyChecks = append(o.ReadyChecks, fns...)
-	}
-}
-
-func Name(name string) Option {
-	return func(o *Options) {
-		o.Name = name
-	}
-}
-
-func Version(version string) Option {
-	return func(o *Options) {
-		o.Version = version
-	}
-}
-
-func NewHandler(opts ...Option) *Handler {
-	options := Options{}
-	for _, o := range opts {
-		o(&options)
-	}
-	return &Handler{opts: options}
-}
-
-func (h *Handler) Live(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
-	var err error
-	for _, fn := range h.opts.LiveChecks {
-		if err = fn(ctx); err != nil {
-			return errors.ServiceUnavailable(h.opts.Name, "%v", err)
-		}
-	}
-	return nil
-}
-
-func (h *Handler) Ready(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
-	var err error
-	for _, fn := range h.opts.ReadyChecks {
-		if err = fn(ctx); err != nil {
-			return errors.ServiceUnavailable(h.opts.Name, "%v", err)
-		}
-	}
-	return nil
-}
-
-func (h *Handler) Version(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
-	rsp.Data = []byte(h.opts.Version)
-	return nil
-}

server/health/health.proto

@@ -1,50 +0,0 @@
-syntax = "proto3";
-
-package micro.server.health;
-option go_package = "go.unistack.org/micro/v3/server/health;health";
-
-import "api/annotations.proto";
-import "openapiv3/annotations.proto";
-import "codec/frame.proto";
-
-service Health {
-	rpc Live(micro.codec.Frame) returns (micro.codec.Frame) {
-		option (micro.openapiv3.openapiv3_operation) = {
-      operation_id: "Live";
-      responses: {
-        default: {
-          reference: {
-            _ref: "micro.codec.Frame";
-          };
-        };
-      };
-    };
-		option (micro.api.http) = { get: "/live"; };
-  };
-	rpc Ready(micro.codec.Frame) returns (micro.codec.Frame) {
-		option (micro.openapiv3.openapiv3_operation) = {
-      operation_id: "Ready";
-      responses: {
-        default: {
-          reference: {
-            _ref: "micro.codec.Frame";
-          };
-        };
-      };
-    };
-		option (micro.api.http) = { get: "/ready"; };
-  };
-	rpc Version(micro.codec.Frame) returns (micro.codec.Frame) {
-		option (micro.openapiv3.openapiv3_operation) = {
-      operation_id: "Version";
-      responses: {
-        default: {
-          reference: {
-            _ref: "micro.codec.Frame";
-          };
-        };
-      };
-    };
-		option (micro.api.http) = { get: "/version"; };
-  };
-};

server/health/health_micro.pb.go

@@ -1,46 +0,0 @@
-// Code generated by protoc-gen-go-micro. DO NOT EDIT.
-// protoc-gen-go-micro version: v3.5.3
-// source: health.proto
-
-package health
-
-import (
-	context "context"
-	api "go.unistack.org/micro/v3/api"
-	codec "go.unistack.org/micro/v3/codec"
-)
-
-var (
-	HealthName = "Health"
-
-	HealthEndpoints = []api.Endpoint{
-		{
-			Name:    "Health.Live",
-			Path:    []string{"/live"},
-			Method:  []string{"GET"},
-			Handler: "rpc",
-		},
-		{
-			Name:    "Health.Ready",
-			Path:    []string{"/ready"},
-			Method:  []string{"GET"},
-			Handler: "rpc",
-		},
-		{
-			Name:    "Health.Version",
-			Path:    []string{"/version"},
-			Method:  []string{"GET"},
-			Handler: "rpc",
-		},
-	}
-)
-
-func NewHealthEndpoints() []api.Endpoint {
-	return HealthEndpoints
-}
-
-type HealthServer interface {
-	Live(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
-	Ready(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
-	Version(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
-}

server/health/health_micro_http.pb.go

@@ -1,45 +0,0 @@
-// Code generated by protoc-gen-go-micro. DO NOT EDIT.
-// protoc-gen-go-micro version: v3.5.3
-// source: health.proto
-
-package health
-
-import (
-	context "context"
-	api "go.unistack.org/micro/v3/api"
-	codec "go.unistack.org/micro/v3/codec"
-	server "go.unistack.org/micro/v3/server"
-)
-
-type healthServer struct {
-	HealthServer
-}
-
-func (h *healthServer) Live(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
-	return h.HealthServer.Live(ctx, req, rsp)
-}
-
-func (h *healthServer) Ready(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
-	return h.HealthServer.Ready(ctx, req, rsp)
-}
-
-func (h *healthServer) Version(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
-	return h.HealthServer.Version(ctx, req, rsp)
-}
-
-func RegisterHealthServer(s server.Server, sh HealthServer, opts ...server.HandlerOption) error {
-	type health interface {
-		Live(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
-		Ready(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
-		Version(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
-	}
-	type Health struct {
-		health
-	}
-	h := &healthServer{sh}
-	var nopts []server.HandlerOption
-	for _, endpoint := range HealthEndpoints {
-		nopts = append(nopts, api.WithEndpoint(&endpoint))
-	}
-	return s.Handle(s.NewHandler(&Health{h}, append(nopts, opts...)...))
-}

server/noop.go

@@ -1,14 +1,22 @@
 package server
 
 import (
+	"bytes"
+	"context"
 	"fmt"
+	"reflect"
+	"runtime/debug"
 	"sort"
+	"strings"
 	"sync"
 	"time"
 
 	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v3/errors"
 	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/register"
 	maddr "go.unistack.org/micro/v3/util/addr"
 	mnet "go.unistack.org/micro/v3/util/net"
@@ -24,6 +32,58 @@ const (
 	defaultContentType = "application/json"
 )
 
+type rpcHandler struct {
+	opts      HandlerOptions
+	handler   interface{}
+	name      string
+	endpoints []*register.Endpoint
+}
+
+func newRPCHandler(handler interface{}, opts ...HandlerOption) Handler {
+	options := NewHandlerOptions(opts...)
+
+	typ := reflect.TypeOf(handler)
+	hdlr := reflect.ValueOf(handler)
+	name := reflect.Indirect(hdlr).Type().Name()
+
+	var endpoints []*register.Endpoint
+
+	for m := 0; m < typ.NumMethod(); m++ {
+		if e := register.ExtractEndpoint(typ.Method(m)); e != nil {
+			e.Name = name + "." + e.Name
+
+			for k, v := range options.Metadata[e.Name] {
+				e.Metadata[k] = v
+			}
+
+			endpoints = append(endpoints, e)
+		}
+	}
+
+	return &rpcHandler{
+		name:      name,
+		handler:   handler,
+		endpoints: endpoints,
+		opts:      options,
+	}
+}
+
+func (r *rpcHandler) Name() string {
+	return r.name
+}
+
+func (r *rpcHandler) Handler() interface{} {
+	return r.handler
+}
+
+func (r *rpcHandler) Endpoints() []*register.Endpoint {
+	return r.endpoints
+}
+
+func (r *rpcHandler) Options() HandlerOptions {
+	return r.opts
+}
+
 type noopServer struct {
 	h           Handler
 	wg          *sync.WaitGroup
@@ -94,6 +154,35 @@ func (n *noopServer) Subscribe(sb Subscriber) error {
 	return nil
 }
 
+type rpcMessage struct {
+	payload     interface{}
+	codec       codec.Codec
+	header      metadata.Metadata
+	topic       string
+	contentType string
+	body        []byte
+}
+
+func (r *rpcMessage) ContentType() string {
+	return r.contentType
+}
+
+func (r *rpcMessage) Topic() string {
+	return r.topic
+}
+
+func (r *rpcMessage) Body() interface{} {
+	return r.payload
+}
+
+func (r *rpcMessage) Header() metadata.Metadata {
+	return r.header
+}
+
+func (r *rpcMessage) Codec() codec.Codec {
+	return r.codec
+}
+
 func (n *noopServer) NewHandler(h interface{}, opts ...HandlerOption) Handler {
 	return newRPCHandler(h, opts...)
 }
@@ -185,7 +274,7 @@ func (n *noopServer) Register() error {
 
 	if !registered {
 		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(n.opts.Context, "register [%s] Registering node: %s", config.Register.String(), service.Nodes[0].ID)
+			config.Logger.Info(n.opts.Context, fmt.Sprintf("register [%s] Registering node: %s", config.Register.String(), service.Nodes[0].ID))
 		}
 	}
 
@@ -202,39 +291,6 @@ func (n *noopServer) Register() error {
 	n.Lock()
 	defer n.Unlock()
 
-	cx := config.Context
-
-	var sub broker.Subscriber
-
-	for sb := range n.subscribers {
-		if sb.Options().Context != nil {
-			cx = sb.Options().Context
-		}
-
-		opts := []broker.SubscribeOption{broker.SubscribeContext(cx), broker.SubscribeAutoAck(sb.Options().AutoAck)}
-		if queue := sb.Options().Queue; len(queue) > 0 {
-			opts = append(opts, broker.SubscribeGroup(queue))
-		}
-
-		if sb.Options().Batch {
-			// batch processing handler
-			sub, err = config.Broker.BatchSubscribe(cx, sb.Topic(), n.newBatchSubHandler(sb, config), opts...)
-		} else {
-			// single processing handler
-			sub, err = config.Broker.Subscribe(cx, sb.Topic(), n.newSubHandler(sb, config), opts...)
-		}
-
-		if err != nil {
-			return err
-		}
-
-		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(n.opts.Context, "subscribing to topic: %s", sb.Topic())
-		}
-
-		n.subscribers[sb] = []broker.Subscriber{sub}
-	}
-
 	n.registered = true
 	if cacheService {
 		n.rsvc = service
@@ -256,7 +312,7 @@ func (n *noopServer) Deregister() error {
 	}
 
 	if config.Logger.V(logger.InfoLevel) {
-		config.Logger.Infof(n.opts.Context, "deregistering node: %s", service.Nodes[0].ID)
+		config.Logger.Info(n.opts.Context, fmt.Sprintf("deregistering node: %s", service.Nodes[0].ID))
 	}
 
 	if err := DefaultDeregisterFunc(service, config); err != nil {
@@ -287,11 +343,11 @@ func (n *noopServer) Deregister() error {
 			go func(s broker.Subscriber) {
 				defer wg.Done()
 				if config.Logger.V(logger.InfoLevel) {
-					config.Logger.Infof(n.opts.Context, "unsubscribing from topic: %s", s.Topic())
+					config.Logger.Info(n.opts.Context, "unsubscribing from topic: "+s.Topic())
 				}
 				if err := s.Unsubscribe(ncx); err != nil {
 					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(n.opts.Context, "unsubscribing from topic: %s err: %v", s.Topic(), err)
+						config.Logger.Error(n.opts.Context, "unsubscribing from topic: "+s.Topic(), err)
 					}
 				}
 			}(subs[idx])
@@ -327,7 +383,7 @@ func (n *noopServer) Start() error {
 	config.Address = addr
 
 	if config.Logger.V(logger.InfoLevel) {
-		config.Logger.Infof(n.opts.Context, "server [noop] Listening on %s", config.Address)
+		config.Logger.Info(n.opts.Context, "server [noop] Listening on "+config.Address)
 	}
 
 	n.Lock()
@@ -341,13 +397,13 @@ func (n *noopServer) Start() error {
 		// connect to the broker
 		if err := config.Broker.Connect(config.Context); err != nil {
 			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(n.opts.Context, "broker [%s] connect error: %v", config.Broker.String(), err)
+				config.Logger.Error(n.opts.Context, fmt.Sprintf("broker [%s] connect error", config.Broker.String()), err)
 			}
 			return err
 		}
 
 		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(n.opts.Context, "broker [%s] Connected to %s", config.Broker.String(), config.Broker.Address())
+			config.Logger.Info(n.opts.Context, fmt.Sprintf("broker [%s] Connected to %s", config.Broker.String(), config.Broker.Address()))
 		}
 	}
 
@@ -355,17 +411,21 @@ func (n *noopServer) Start() error {
 	// nolint: nestif
 	if err := config.RegisterCheck(config.Context); err != nil {
 		if config.Logger.V(logger.ErrorLevel) {
-			config.Logger.Errorf(n.opts.Context, "server %s-%s register check error: %s", config.Name, config.ID, err)
+			config.Logger.Error(n.opts.Context, fmt.Sprintf("server %s-%s register check error", config.Name, config.ID), err)
 		}
 	} else {
 		// announce self to the world
 		if err := n.Register(); err != nil {
 			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(n.opts.Context, "server register error: %v", err)
+				config.Logger.Error(n.opts.Context, "server register error", err)
 			}
 		}
 	}
 
+	if err := n.subscribe(); err != nil {
+		return err
+	}
+
 	go func() {
 		t := new(time.Ticker)
 
@@ -390,23 +450,23 @@ func (n *noopServer) Start() error {
 				// nolint: nestif
 				if rerr != nil && registered {
 					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(n.opts.Context, "server %s-%s register check error: %s, deregister it", config.Name, config.ID, rerr)
+						config.Logger.Error(n.opts.Context, fmt.Sprintf("server %s-%s register check error, deregister it", config.Name, config.ID), rerr)
 					}
 					// deregister self in case of error
 					if err := n.Deregister(); err != nil {
 						if config.Logger.V(logger.ErrorLevel) {
-							config.Logger.Errorf(n.opts.Context, "server %s-%s deregister error: %s", config.Name, config.ID, err)
+							config.Logger.Error(n.opts.Context, fmt.Sprintf("server %s-%s deregister error", config.Name, config.ID), err)
 						}
 					}
 				} else if rerr != nil && !registered {
 					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(n.opts.Context, "server %s-%s register check error: %s", config.Name, config.ID, rerr)
+						config.Logger.Errorf(n.opts.Context, fmt.Sprintf("server %s-%s register check error", config.Name, config.ID), rerr)
 					}
 					continue
 				}
 				if err := n.Register(); err != nil {
 					if config.Logger.V(logger.ErrorLevel) {
-						config.Logger.Errorf(n.opts.Context, "server %s-%s register error: %s", config.Name, config.ID, err)
+						config.Logger.Error(n.opts.Context, fmt.Sprintf("server %s-%s register error", config.Name, config.ID), err)
 					}
 				}
 			// wait for exit
@@ -418,7 +478,7 @@ func (n *noopServer) Start() error {
 		// deregister self
 		if err := n.Deregister(); err != nil {
 			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(n.opts.Context, "server deregister error: ", err)
+				config.Logger.Error(n.opts.Context, "server deregister error", err)
 			}
 		}
 
@@ -431,12 +491,12 @@ func (n *noopServer) Start() error {
 		ch <- nil
 
 		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(n.opts.Context, "broker [%s] Disconnected from %s", config.Broker.String(), config.Broker.Address())
+			config.Logger.Info(n.opts.Context, fmt.Sprintf("broker [%s] Disconnected from %s", config.Broker.String(), config.Broker.Address()))
 		}
 		// disconnect broker
 		if err := config.Broker.Disconnect(config.Context); err != nil {
 			if config.Logger.V(logger.ErrorLevel) {
-				config.Logger.Errorf(n.opts.Context, "broker [%s] disconnect error: %v", config.Broker.String(), err)
+				config.Logger.Error(n.opts.Context, fmt.Sprintf("broker [%s] disconnect error", config.Broker.String()), err)
 			}
 		}
 	}()
@@ -449,6 +509,42 @@ func (n *noopServer) Start() error {
 	return nil
 }
 
+func (n *noopServer) subscribe() error {
+	config := n.Options()
+
+	subCtx := config.Context
+
+	for sb := range n.subscribers {
+
+		if cx := sb.Options().Context; cx != nil {
+			subCtx = cx
+		}
+
+		opts := []broker.SubscribeOption{
+			broker.SubscribeContext(subCtx),
+			broker.SubscribeAutoAck(sb.Options().AutoAck),
+			broker.SubscribeBodyOnly(sb.Options().BodyOnly),
+		}
+
+		if queue := sb.Options().Queue; len(queue) > 0 {
+			opts = append(opts, broker.SubscribeGroup(queue))
+		}
+
+		if config.Logger.V(logger.InfoLevel) {
+			config.Logger.Info(n.opts.Context, "subscribing to topic: "+sb.Topic())
+		}
+
+		sub, err := config.Broker.Subscribe(subCtx, sb.Topic(), n.createSubHandler(sb, config), opts...)
+		if err != nil {
+			return err
+		}
+
+		n.subscribers[sb] = []broker.Subscriber{sub}
+	}
+
+	return nil
+}
+
 func (n *noopServer) Stop() error {
 	n.RLock()
 	if !n.started {
@@ -468,3 +564,218 @@ func (n *noopServer) Stop() error {
 
 	return err
 }
+
+func newSubscriber(topic string, sub interface{}, opts ...SubscriberOption) Subscriber {
+	var endpoints []*register.Endpoint
+	var handlers []*handler
+
+	options := NewSubscriberOptions(opts...)
+
+	if typ := reflect.TypeOf(sub); typ.Kind() == reflect.Func {
+		h := &handler{
+			method: reflect.ValueOf(sub),
+		}
+
+		switch typ.NumIn() {
+		case 1:
+			h.reqType = typ.In(0)
+		case 2:
+			h.ctxType = typ.In(0)
+			h.reqType = typ.In(1)
+		}
+
+		handlers = append(handlers, h)
+		ep := &register.Endpoint{
+			Name:     "Func",
+			Request:  register.ExtractSubValue(typ),
+			Metadata: metadata.New(2),
+		}
+		ep.Metadata.Set("topic", topic)
+		ep.Metadata.Set("subscriber", "true")
+		endpoints = append(endpoints, ep)
+	} else {
+		hdlr := reflect.ValueOf(sub)
+		name := reflect.Indirect(hdlr).Type().Name()
+
+		for m := 0; m < typ.NumMethod(); m++ {
+			method := typ.Method(m)
+			h := &handler{
+				method: method.Func,
+			}
+
+			switch method.Type.NumIn() {
+			case 2:
+				h.reqType = method.Type.In(1)
+			case 3:
+				h.ctxType = method.Type.In(1)
+				h.reqType = method.Type.In(2)
+			}
+
+			handlers = append(handlers, h)
+			ep := &register.Endpoint{
+				Name:     name + "." + method.Name,
+				Request:  register.ExtractSubValue(method.Type),
+				Metadata: metadata.New(2),
+			}
+			ep.Metadata.Set("topic", topic)
+			ep.Metadata.Set("subscriber", "true")
+			endpoints = append(endpoints, ep)
+		}
+	}
+
+	return &subscriber{
+		rcvr:       reflect.ValueOf(sub),
+		typ:        reflect.TypeOf(sub),
+		topic:      topic,
+		subscriber: sub,
+		handlers:   handlers,
+		endpoints:  endpoints,
+		opts:       options,
+	}
+}
+
+//nolint:gocyclo
+func (n *noopServer) createSubHandler(sb *subscriber, opts Options) broker.Handler {
+	return func(p broker.Event) (err error) {
+		defer func() {
+			if r := recover(); r != nil {
+				n.RLock()
+				config := n.opts
+				n.RUnlock()
+				if config.Logger.V(logger.ErrorLevel) {
+					config.Logger.Error(n.opts.Context, "panic recovered: ", r)
+					config.Logger.Error(n.opts.Context, string(debug.Stack()))
+				}
+				err = errors.InternalServerError(n.opts.Name+".subscriber", "panic recovered: %v", r)
+			}
+		}()
+
+		msg := p.Message()
+		// if we don't have headers, create empty map
+		if msg.Header == nil {
+			msg.Header = metadata.New(2)
+		}
+
+		ct := msg.Header["Content-Type"]
+		if len(ct) == 0 {
+			msg.Header.Set(metadata.HeaderContentType, defaultContentType)
+			ct = defaultContentType
+		}
+		cf, err := n.newCodec(ct)
+		if err != nil {
+			return err
+		}
+
+		hdr := metadata.New(len(msg.Header))
+		for k, v := range msg.Header {
+			hdr.Set(k, v)
+		}
+
+		ctx := metadata.NewIncomingContext(sb.opts.Context, hdr)
+
+		results := make(chan error, len(sb.handlers))
+
+		for i := 0; i < len(sb.handlers); i++ {
+			handler := sb.handlers[i]
+
+			var isVal bool
+			var req reflect.Value
+
+			if handler.reqType.Kind() == reflect.Ptr {
+				req = reflect.New(handler.reqType.Elem())
+			} else {
+				req = reflect.New(handler.reqType)
+				isVal = true
+			}
+			if isVal {
+				req = req.Elem()
+			}
+
+			if err = cf.ReadBody(bytes.NewBuffer(msg.Body), req.Interface()); err != nil {
+				return err
+			}
+
+			fn := func(ctx context.Context, msg Message) error {
+				var vals []reflect.Value
+				if sb.typ.Kind() != reflect.Func {
+					vals = append(vals, sb.rcvr)
+				}
+				if handler.ctxType != nil {
+					vals = append(vals, reflect.ValueOf(ctx))
+				}
+
+				vals = append(vals, reflect.ValueOf(msg.Body()))
+
+				returnValues := handler.method.Call(vals)
+				if rerr := returnValues[0].Interface(); rerr != nil {
+					return rerr.(error)
+				}
+				return nil
+			}
+
+			opts.Hooks.EachNext(func(hook options.Hook) {
+				if h, ok := hook.(HookSubHandler); ok {
+					fn = h(fn)
+				}
+			})
+
+			if n.wg != nil {
+				n.wg.Add(1)
+			}
+			go func() {
+				if n.wg != nil {
+					defer n.wg.Done()
+				}
+				cerr := fn(ctx, &rpcMessage{
+					topic:       sb.topic,
+					contentType: ct,
+					payload:     req.Interface(),
+					header:      msg.Header,
+				})
+				results <- cerr
+			}()
+		}
+		var errors []string
+		for i := 0; i < len(sb.handlers); i++ {
+			if rerr := <-results; rerr != nil {
+				errors = append(errors, rerr.Error())
+			}
+		}
+		if len(errors) > 0 {
+			err = fmt.Errorf("subscriber error: %s", strings.Join(errors, "\n"))
+		}
+		return err
+	}
+}
+
+func (s *subscriber) Topic() string {
+	return s.topic
+}
+
+func (s *subscriber) Subscriber() interface{} {
+	return s.subscriber
+}
+
+func (s *subscriber) Endpoints() []*register.Endpoint {
+	return s.endpoints
+}
+
+func (s *subscriber) Options() SubscriberOptions {
+	return s.opts
+}
+
+type subscriber struct {
+	typ        reflect.Type
+	subscriber interface{}
+	topic      string
+	endpoints  []*register.Endpoint
+	handlers   []*handler
+	opts       SubscriberOptions
+	rcvr       reflect.Value
+}
+
+type handler struct {
+	reqType reflect.Type
+	ctxType reflect.Type
+	method  reflect.Value
+}

server/noop_test.go

@@ -9,7 +9,6 @@ import (
 	"go.unistack.org/micro/v3/client"
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/metadata"
 	"go.unistack.org/micro/v3/server"
 )
 
@@ -26,18 +25,6 @@ func (h *TestHandler) SingleSubHandler(ctx context.Context, msg *codec.Frame) er
 	return nil
 }
 
-func (h *TestHandler) BatchSubHandler(ctxs []context.Context, msgs []*codec.Frame) error {
-	if len(msgs) != 8 {
-		h.t.Fatal("invalid number of messages received")
-	}
-	for idx := 0; idx < len(msgs); idx++ {
-		md, _ := metadata.FromIncomingContext(ctxs[idx])
-		_ = md
-		//	fmt.Printf("msg md %v\n", md)
-	}
-	return nil
-}
-
 func TestNoopSub(t *testing.T) {
 	ctx := context.Background()
 
@@ -76,13 +63,6 @@ func TestNoopSub(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if err := s.Subscribe(s.NewSubscriber("batch_topic", h.BatchSubHandler,
-		server.SubscriberQueue("queue"),
-		server.SubscriberBatch(true),
-	)); err != nil {
-		t.Fatal(err)
-	}
-
 	if err := s.Start(); err != nil {
 		t.Fatal(err)
 	}

server/options.go

@@ -13,7 +13,9 @@ import (
 	"go.unistack.org/micro/v3/metadata"
 	"go.unistack.org/micro/v3/meter"
 	"go.unistack.org/micro/v3/network/transport"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/register"
+	msync "go.unistack.org/micro/v3/sync"
 	"go.unistack.org/micro/v3/tracer"
 	"go.unistack.org/micro/v3/util/id"
 )
@@ -46,7 +48,7 @@ type Options struct {
 	// Listener may be passed if already created
 	Listener net.Listener
 	// Wait group
-	Wait *sync.WaitGroup
+	Wait *msync.WaitGroup
 	// TLSConfig specifies tls.Config for secure serving
 	TLSConfig *tls.Config
 	// Metadata holds the server metadata
@@ -67,12 +69,6 @@ type Options struct {
 	Advertise string
 	// Version holds the server version
 	Version string
-	// SubWrappers holds the server subscribe wrappers
-	SubWrappers []SubscriberWrapper
-	// BatchSubWrappers holds the server batch subscribe wrappers
-	BatchSubWrappers []BatchSubscriberWrapper
-	// HdlrWrappers holds the handler wrappers
-	HdlrWrappers []HandlerWrapper
 	// RegisterAttempts holds the number of register attempts before error
 	RegisterAttempts int
 	// RegisterInterval holds he interval for re-register
@@ -83,6 +79,11 @@ type Options struct {
 	MaxConn int
 	// DeregisterAttempts holds the number of deregister attempts before error
 	DeregisterAttempts int
+	// Hooks may contains hook actions that performs before/after server handler
+	// or server subscriber handler
+	Hooks options.Hooks
+	// GracefulTimeout timeout for graceful stop server
+	GracefulTimeout time.Duration
 }
 
 // NewOptions returns new options struct with default or passed values
@@ -105,6 +106,7 @@ func NewOptions(opts ...Option) Options {
 		Version:          DefaultVersion,
 		ID:               id.Must(),
 		Namespace:        DefaultNamespace,
+		GracefulTimeout:  DefaultGracefulTimeout,
 	}
 
 	for _, o := range opts {
@@ -276,28 +278,7 @@ func Wait(wg *sync.WaitGroup) Option {
 		if wg == nil {
 			wg = new(sync.WaitGroup)
 		}
-		o.Wait = wg
-	}
-}
-
-// WrapHandler adds a handler Wrapper to a list of options passed into the server
-func WrapHandler(w HandlerWrapper) Option {
-	return func(o *Options) {
-		o.HdlrWrappers = append(o.HdlrWrappers, w)
-	}
-}
-
-// WrapSubscriber adds a subscriber Wrapper to a list of options passed into the server
-func WrapSubscriber(w SubscriberWrapper) Option {
-	return func(o *Options) {
-		o.SubWrappers = append(o.SubWrappers, w)
-	}
-}
-
-// WrapBatchSubscriber adds a batch subscriber Wrapper to a list of options passed into the server
-func WrapBatchSubscriber(w BatchSubscriberWrapper) Option {
-	return func(o *Options) {
-		o.BatchSubWrappers = append(o.BatchSubWrappers, w)
+		o.Wait = msync.WrapWaitGroup(wg)
 	}
 }
 
@@ -318,11 +299,18 @@ func Listener(l net.Listener) Option {
 // HandlerOption func
 type HandlerOption func(*HandlerOptions)
 
+// GracefulTimeout duration
+func GracefulTimeout(td time.Duration) Option {
+	return func(o *Options) {
+		o.GracefulTimeout = td
+	}
+}
+
 // HandlerOptions struct
 type HandlerOptions struct {
 	// Context holds external options
 	Context context.Context
-	// Metadata for hondler
+	// Metadata for handler
 	Metadata map[string]metadata.Metadata
 }
 
@@ -353,8 +341,6 @@ type SubscriberOptions struct {
 	AutoAck bool
 	// BodyOnly flag specifies that message without headers
 	BodyOnly bool
-	// Batch flag specifies that message processed in batches
-	Batch bool
 	// BatchSize flag specifies max size of batch
 	BatchSize int
 	// BatchWait flag specifies max wait time for batch filling
@@ -426,13 +412,6 @@ func SubscriberAck(b bool) SubscriberOption {
 	}
 }
 
-// SubscriberBatch control batch processing for handler
-func SubscriberBatch(b bool) SubscriberOption {
-	return func(o *SubscriberOptions) {
-		o.Batch = b
-	}
-}
-
 // SubscriberBatchSize control batch filling size for handler
 // Batch filling max waiting time controlled by SubscriberBatchWait
 func SubscriberBatchSize(n int) SubscriberOption {
@@ -447,3 +426,10 @@ func SubscriberBatchWait(td time.Duration) SubscriberOption {
 		o.BatchWait = td
 	}
 }
+
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
+	return func(o *Options) {
+		o.Hooks = append(o.Hooks, h...)
+	}
+}

server/request.go

@@ -1,35 +0,0 @@
-package server
-
-import (
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/metadata"
-)
-
-type rpcMessage struct {
-	payload     interface{}
-	codec       codec.Codec
-	header      metadata.Metadata
-	topic       string
-	contentType string
-	body        []byte
-}
-
-func (r *rpcMessage) ContentType() string {
-	return r.contentType
-}
-
-func (r *rpcMessage) Topic() string {
-	return r.topic
-}
-
-func (r *rpcMessage) Body() interface{} {
-	return r.payload
-}
-
-func (r *rpcMessage) Header() metadata.Metadata {
-	return r.header
-}
-
-func (r *rpcMessage) Codec() codec.Codec {
-	return r.codec
-}

server/server.go

@@ -11,7 +11,7 @@ import (
 )
 
 // DefaultServer default server
-var DefaultServer = NewServer()
+var DefaultServer Server = NewServer()
 
 var (
 	// DefaultAddress will be used if no address passed, use secure localhost
@@ -34,6 +34,8 @@ var (
 	DefaultMaxMsgRecvSize = 1024 * 1024 * 4 // 4Mb
 	// DefaultMaxMsgSendSize holds default max send size
 	DefaultMaxMsgSendSize = 1024 * 1024 * 4 // 4Mb
+	// DefaultGracefulTimeout default time for graceful stop
+	DefaultGracefulTimeout = 5 * time.Second
 )
 
 // Server is a simple micro server abstraction
@@ -60,6 +62,13 @@ type Server interface {
 	String() string
 }
 
+type (
+	FuncSubHandler func(ctx context.Context, ms Message) error
+	HookSubHandler func(next FuncSubHandler) FuncSubHandler
+	FuncHandler    func(ctx context.Context, req Request, rsp interface{}) error
+	HookHandler    func(next FuncHandler) FuncHandler
+)
+
 /*
 // Router handle serving messages
 type Router interface {
@@ -145,12 +154,11 @@ type Stream interface {
 //
 // Example:
 //
-//      type Greeter struct {}
-//
-//      func (g *Greeter) Hello(context, request, response) error {
-//              return nil
-//      }
+//	type Greeter struct {}
 //
+//	func (g *Greeter) Hello(context, request, response) error {
+//	        return nil
+//	}
 type Handler interface {
 	Name() string
 	Handler() interface{}

server/subscriber.go

@@ -1,52 +1,24 @@
 package server
 
 import (
-	"bytes"
-	"context"
 	"fmt"
 	"reflect"
-	"runtime/debug"
-	"strings"
 	"unicode"
 	"unicode/utf8"
-
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/errors"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/register"
 )
 
 const (
-	subSig      = "func(context.Context, interface{}) error"
-	batchSubSig = "func([]context.Context, []interface{}) error"
+	subSig = "func(context.Context, interface{}) error"
 )
 
 // Precompute the reflect type for error. Can't use error directly
 // because Typeof takes an empty interface value. This is annoying.
 var typeOfError = reflect.TypeOf((*error)(nil)).Elem()
 
-type handler struct {
-	reqType reflect.Type
-	ctxType reflect.Type
-	method  reflect.Value
-}
-
-type subscriber struct {
-	typ        reflect.Type
-	subscriber interface{}
-	topic      string
-	endpoints  []*register.Endpoint
-	handlers   []*handler
-	opts       SubscriberOptions
-	rcvr       reflect.Value
-}
-
 // Is this an exported - upper case - name?
 func isExported(name string) bool {
-	rune, _ := utf8.DecodeRuneInString(name)
-	return unicode.IsUpper(rune)
+	r, _ := utf8.DecodeRuneInString(name)
+	return unicode.IsUpper(r)
 }
 
 // Is this type exported or a builtin?
@@ -69,23 +41,15 @@ func ValidateSubscriber(sub Subscriber) error {
 		switch typ.NumIn() {
 		case 2:
 			argType = typ.In(1)
-			if sub.Options().Batch {
-				if argType.Kind() != reflect.Slice {
-					return fmt.Errorf("subscriber %v dont have required signature %s", name, batchSubSig)
-				}
-				if strings.Compare(fmt.Sprintf("%v", argType), "[]interface{}") == 0 {
-					return fmt.Errorf("subscriber %v dont have required signaure %s", name, batchSubSig)
-				}
-			}
 		default:
-			return fmt.Errorf("subscriber %v takes wrong number of args: %v required signature %s or %s", name, typ.NumIn(), subSig, batchSubSig)
+			return fmt.Errorf("subscriber %v takes wrong number of args: %v required signature %s", name, typ.NumIn(), subSig)
 		}
 		if !isExportedOrBuiltinType(argType) {
 			return fmt.Errorf("subscriber %v argument type not exported: %v", name, argType)
 		}
 		if typ.NumOut() != 1 {
-			return fmt.Errorf("subscriber %v has wrong number of return values: %v require signature %s or %s",
-				name, typ.NumOut(), subSig, batchSubSig)
+			return fmt.Errorf("subscriber %v has wrong number of return values: %v require signature %s",
+				name, typ.NumOut(), subSig)
 		}
 		if returnType := typ.Out(0); returnType != typeOfError {
 			return fmt.Errorf("subscriber %v returns %v not error", name, returnType.String())
@@ -100,8 +64,8 @@ func ValidateSubscriber(sub Subscriber) error {
 			case 3:
 				argType = method.Type.In(2)
 			default:
-				return fmt.Errorf("subscriber %v.%v takes wrong number of args: %v required signature %s or %s",
-					name, method.Name, method.Type.NumIn(), subSig, batchSubSig)
+				return fmt.Errorf("subscriber %v.%v takes wrong number of args: %v required signature %s",
+					name, method.Name, method.Type.NumIn(), subSig)
 			}
 
 			if !isExportedOrBuiltinType(argType) {
@@ -109,8 +73,8 @@ func ValidateSubscriber(sub Subscriber) error {
 			}
 			if method.Type.NumOut() != 1 {
 				return fmt.Errorf(
-					"subscriber %v.%v has wrong number of return values: %v require signature %s or %s",
-					name, method.Name, method.Type.NumOut(), subSig, batchSubSig)
+					"subscriber %v.%v has wrong number of return values: %v require signature %s",
+					name, method.Name, method.Type.NumOut(), subSig)
 			}
 			if returnType := method.Type.Out(0); returnType != typeOfError {
 				return fmt.Errorf("subscriber %v.%v returns %v not error", name, method.Name, returnType.String())
@@ -120,321 +84,3 @@ func ValidateSubscriber(sub Subscriber) error {
 
 	return nil
 }
-
-func newSubscriber(topic string, sub interface{}, opts ...SubscriberOption) Subscriber {
-	var endpoints []*register.Endpoint
-	var handlers []*handler
-
-	options := NewSubscriberOptions(opts...)
-
-	if typ := reflect.TypeOf(sub); typ.Kind() == reflect.Func {
-		h := &handler{
-			method: reflect.ValueOf(sub),
-		}
-
-		switch typ.NumIn() {
-		case 1:
-			h.reqType = typ.In(0)
-		case 2:
-			h.ctxType = typ.In(0)
-			h.reqType = typ.In(1)
-		}
-
-		handlers = append(handlers, h)
-		ep := &register.Endpoint{
-			Name:     "Func",
-			Request:  register.ExtractSubValue(typ),
-			Metadata: metadata.New(2),
-		}
-		ep.Metadata.Set("topic", topic)
-		ep.Metadata.Set("subscriber", "true")
-		endpoints = append(endpoints, ep)
-	} else {
-		hdlr := reflect.ValueOf(sub)
-		name := reflect.Indirect(hdlr).Type().Name()
-
-		for m := 0; m < typ.NumMethod(); m++ {
-			method := typ.Method(m)
-			h := &handler{
-				method: method.Func,
-			}
-
-			switch method.Type.NumIn() {
-			case 2:
-				h.reqType = method.Type.In(1)
-			case 3:
-				h.ctxType = method.Type.In(1)
-				h.reqType = method.Type.In(2)
-			}
-
-			handlers = append(handlers, h)
-			ep := &register.Endpoint{
-				Name:     name + "." + method.Name,
-				Request:  register.ExtractSubValue(method.Type),
-				Metadata: metadata.New(2),
-			}
-			ep.Metadata.Set("topic", topic)
-			ep.Metadata.Set("subscriber", "true")
-			endpoints = append(endpoints, ep)
-		}
-	}
-
-	return &subscriber{
-		rcvr:       reflect.ValueOf(sub),
-		typ:        reflect.TypeOf(sub),
-		topic:      topic,
-		subscriber: sub,
-		handlers:   handlers,
-		endpoints:  endpoints,
-		opts:       options,
-	}
-}
-
-//nolint:gocyclo
-func (n *noopServer) newBatchSubHandler(sb *subscriber, opts Options) broker.BatchHandler {
-	return func(ps broker.Events) (err error) {
-		defer func() {
-			if r := recover(); r != nil {
-				n.RLock()
-				config := n.opts
-				n.RUnlock()
-				if config.Logger.V(logger.ErrorLevel) {
-					config.Logger.Error(n.opts.Context, "panic recovered: ", r)
-					config.Logger.Error(n.opts.Context, string(debug.Stack()))
-				}
-				err = errors.InternalServerError(n.opts.Name+".subscriber", "panic recovered: %v", r)
-			}
-		}()
-
-		msgs := make([]Message, 0, len(ps))
-		ctxs := make([]context.Context, 0, len(ps))
-		for _, p := range ps {
-			msg := p.Message()
-			// if we don't have headers, create empty map
-			if msg.Header == nil {
-				msg.Header = metadata.New(2)
-			}
-
-			ct, _ := msg.Header.Get(metadata.HeaderContentType)
-			if len(ct) == 0 {
-				msg.Header.Set(metadata.HeaderContentType, defaultContentType)
-				ct = defaultContentType
-			}
-			hdr := metadata.Copy(msg.Header)
-			topic, _ := msg.Header.Get(metadata.HeaderTopic)
-			ctxs = append(ctxs, metadata.NewIncomingContext(sb.opts.Context, hdr))
-			msgs = append(msgs, &rpcMessage{
-				topic:       topic,
-				contentType: ct,
-				header:      msg.Header,
-				body:        msg.Body,
-			})
-		}
-		results := make(chan error, len(sb.handlers))
-
-		for i := 0; i < len(sb.handlers); i++ {
-			handler := sb.handlers[i]
-
-			var req reflect.Value
-
-			switch handler.reqType.Kind() {
-			case reflect.Ptr:
-				req = reflect.New(handler.reqType.Elem())
-			default:
-				req = reflect.New(handler.reqType.Elem()).Elem()
-			}
-
-			reqType := handler.reqType
-			var cf codec.Codec
-			for _, msg := range msgs {
-				cf, err = n.newCodec(msg.ContentType())
-				if err != nil {
-					return err
-				}
-				rb := reflect.New(req.Type().Elem())
-				if err = cf.ReadBody(bytes.NewReader(msg.(*rpcMessage).body), rb.Interface()); err != nil {
-					return err
-				}
-				msg.(*rpcMessage).codec = cf
-				msg.(*rpcMessage).payload = rb.Interface()
-			}
-
-			fn := func(ctxs []context.Context, ms []Message) error {
-				var vals []reflect.Value
-				if sb.typ.Kind() != reflect.Func {
-					vals = append(vals, sb.rcvr)
-				}
-				if handler.ctxType != nil {
-					vals = append(vals, reflect.ValueOf(ctxs))
-				}
-				payloads := reflect.MakeSlice(reqType, 0, len(ms))
-				for _, m := range ms {
-					payloads = reflect.Append(payloads, reflect.ValueOf(m.Body()))
-				}
-				vals = append(vals, payloads)
-
-				returnValues := handler.method.Call(vals)
-				if rerr := returnValues[0].Interface(); rerr != nil {
-					return rerr.(error)
-				}
-				return nil
-			}
-
-			for i := len(opts.BatchSubWrappers); i > 0; i-- {
-				fn = opts.BatchSubWrappers[i-1](fn)
-			}
-
-			if n.wg != nil {
-				n.wg.Add(1)
-			}
-			go func() {
-				if n.wg != nil {
-					defer n.wg.Done()
-				}
-				results <- fn(ctxs, msgs)
-			}()
-		}
-
-		var errors []string
-		for i := 0; i < len(sb.handlers); i++ {
-			if rerr := <-results; rerr != nil {
-				errors = append(errors, rerr.Error())
-			}
-		}
-		if len(errors) > 0 {
-			err = fmt.Errorf("subscriber error: %s", strings.Join(errors, "\n"))
-		}
-		return err
-	}
-}
-
-//nolint:gocyclo
-func (n *noopServer) newSubHandler(sb *subscriber, opts Options) broker.Handler {
-	return func(p broker.Event) (err error) {
-		defer func() {
-			if r := recover(); r != nil {
-				n.RLock()
-				config := n.opts
-				n.RUnlock()
-				if config.Logger.V(logger.ErrorLevel) {
-					config.Logger.Error(n.opts.Context, "panic recovered: ", r)
-					config.Logger.Error(n.opts.Context, string(debug.Stack()))
-				}
-				err = errors.InternalServerError(n.opts.Name+".subscriber", "panic recovered: %v", r)
-			}
-		}()
-
-		msg := p.Message()
-		// if we don't have headers, create empty map
-		if msg.Header == nil {
-			msg.Header = metadata.New(2)
-		}
-
-		ct := msg.Header["Content-Type"]
-		if len(ct) == 0 {
-			msg.Header.Set(metadata.HeaderContentType, defaultContentType)
-			ct = defaultContentType
-		}
-		cf, err := n.newCodec(ct)
-		if err != nil {
-			return err
-		}
-
-		hdr := metadata.New(len(msg.Header))
-		for k, v := range msg.Header {
-			if k == "Content-Type" {
-				continue
-			}
-			hdr.Set(k, v)
-		}
-
-		ctx := metadata.NewIncomingContext(sb.opts.Context, hdr)
-
-		results := make(chan error, len(sb.handlers))
-
-		for i := 0; i < len(sb.handlers); i++ {
-			handler := sb.handlers[i]
-
-			var isVal bool
-			var req reflect.Value
-
-			if handler.reqType.Kind() == reflect.Ptr {
-				req = reflect.New(handler.reqType.Elem())
-			} else {
-				req = reflect.New(handler.reqType)
-				isVal = true
-			}
-			if isVal {
-				req = req.Elem()
-			}
-
-			if err = cf.ReadBody(bytes.NewBuffer(msg.Body), req.Interface()); err != nil {
-				return err
-			}
-
-			fn := func(ctx context.Context, msg Message) error {
-				var vals []reflect.Value
-				if sb.typ.Kind() != reflect.Func {
-					vals = append(vals, sb.rcvr)
-				}
-				if handler.ctxType != nil {
-					vals = append(vals, reflect.ValueOf(ctx))
-				}
-
-				vals = append(vals, reflect.ValueOf(msg.Body()))
-
-				returnValues := handler.method.Call(vals)
-				if rerr := returnValues[0].Interface(); rerr != nil {
-					return rerr.(error)
-				}
-				return nil
-			}
-
-			for i := len(opts.SubWrappers); i > 0; i-- {
-				fn = opts.SubWrappers[i-1](fn)
-			}
-
-			if n.wg != nil {
-				n.wg.Add(1)
-			}
-			go func() {
-				if n.wg != nil {
-					defer n.wg.Done()
-				}
-				cerr := fn(ctx, &rpcMessage{
-					topic:       sb.topic,
-					contentType: ct,
-					payload:     req.Interface(),
-					header:      msg.Header,
-				})
-				results <- cerr
-			}()
-		}
-		var errors []string
-		for i := 0; i < len(sb.handlers); i++ {
-			if rerr := <-results; rerr != nil {
-				errors = append(errors, rerr.Error())
-			}
-		}
-		if len(errors) > 0 {
-			err = fmt.Errorf("subscriber error: %s", strings.Join(errors, "\n"))
-		}
-		return err
-	}
-}
-
-func (s *subscriber) Topic() string {
-	return s.topic
-}
-
-func (s *subscriber) Subscriber() interface{} {
-	return s.subscriber
-}
-
-func (s *subscriber) Endpoints() []*register.Endpoint {
-	return s.endpoints
-}
-
-func (s *subscriber) Options() SubscriberOptions {
-	return s.opts
-}

server/wrapper.go

@@ -14,20 +14,12 @@ type HandlerFunc func(ctx context.Context, req Request, rsp interface{}) error
 // publication message.
 type SubscriberFunc func(ctx context.Context, msg Message) error
 
-// BatchSubscriberFunc represents a single method of a subscriber. It's used primarily
-// for the wrappers. What's handed to the actual method is the concrete
-// publication message. This func used by batch subscribers
-type BatchSubscriberFunc func(ctxs []context.Context, msgs []Message) error
-
 // HandlerWrapper wraps the HandlerFunc and returns the equivalent
 type HandlerWrapper func(HandlerFunc) HandlerFunc
 
 // SubscriberWrapper wraps the SubscriberFunc and returns the equivalent
 type SubscriberWrapper func(SubscriberFunc) SubscriberFunc
 
-// BatchSubscriberWrapper wraps the SubscriberFunc and returns the equivalent
-type BatchSubscriberWrapper func(BatchSubscriberFunc) BatchSubscriberFunc
-
 // StreamWrapper wraps a Stream interface and returns the equivalent.
 // Because streams exist for the lifetime of a method invocation this
 // is a convenient way to wrap a Stream as its in use for trace, monitoring,

service.go

@@ -72,8 +72,8 @@ func RegisterSubscriber(topic string, s server.Server, h interface{}, opts ...se
 }
 
 type service struct {
-	sync.RWMutex
 	opts Options
+	sync.RWMutex
 }
 
 // NewService creates and returns a new Service based on the packages within.
@@ -88,6 +88,7 @@ func (s *service) Name() string {
 // Init initialises options. Additionally it calls cmd.Init
 // which parses command line flags. cmd.Init is only called
 // on first Init.
+//
 //nolint:gocyclo
 func (s *service) Init(opts ...Option) error {
 	var err error
@@ -375,17 +376,13 @@ func (s *service) Run() error {
 	return s.Stop()
 }
 
-type nameIface interface {
+type Namer interface {
 	Name() string
 }
 
-func getNameIndex(n string, ifaces interface{}) int {
-	values, ok := ifaces.([]interface{})
-	if !ok {
-		return 0
-	}
-	for idx, iface := range values {
-		if ifc, ok := iface.(nameIface); ok && ifc.Name() == n {
+func getNameIndex[T Namer](n string, ifaces []T) int {
+	for idx, iface := range ifaces {
+		if iface.Name() == n {
 			return idx
 		}
 	}

service_test.go

@@ -17,6 +17,22 @@ import (
 	"go.unistack.org/micro/v3/tracer"
 )
 
+func TestClient(t *testing.T) {
+	c1 := client.NewClient(client.Name("test1"))
+	c2 := client.NewClient(client.Name("test2"))
+
+	svc := NewService(Client(c1, c2))
+
+	if err := svc.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	x1 := svc.Client("test2")
+	if x1.Name() != "test2" {
+		t.Fatalf("invalid client %#+v", svc.Options().Clients)
+	}
+}
+
 type testItem struct {
 	name string
 }
@@ -25,12 +41,11 @@ func (ti *testItem) Name() string {
 	return ti.name
 }
 
-func TestGetNameIndex(t *testing.T) {
-	item1 := &testItem{name: "first"}
-	item2 := &testItem{name: "second"}
-	items := []interface{}{item1, item2}
-	if idx := getNameIndex("second", items); idx != 1 {
-		t.Fatalf("getNameIndex func error, item not found")
+func Test_getNameIndex(t *testing.T) {
+	items := []*testItem{{name: "test1"}, {name: "test2"}}
+	idx := getNameIndex("test2", items)
+	if items[idx].Name() != "test2" {
+		t.Fatal("getNameIndex wrong")
 	}
 }