update meter options

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

.gitea/workflows/lint.yml

@@ -10,15 +10,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup-go
-      uses: https://gitea.com/actions/setup-go@v3
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.18
+        go-version: 1.21
     - name: checkout
-      uses: https://gitea.com/actions/checkout@v3
+      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
+        version: v1.52

.gitea/workflows/pr.yml

@@ -10,14 +10,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: checkout
-      uses: https://gitea.com/actions/checkout@v3
+      uses: actions/checkout@v3
     - name: setup-go
-      uses: https://gitea.com/actions/setup-go@v3
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.18
+        go-version: 1.21
     - name: deps
       run: go get -v -t -d ./...
     - name: test
       env:
         INTEGRATION_TESTS: yes
-      run: go test -mod readonly -v ./...
+      run: go test -mod readonly -v ./...

.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]

broker/broker.go

@@ -4,19 +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.
@@ -45,6 +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
 
@@ -74,6 +88,8 @@ type BatchHandler func(Events) error
 
 // Event is given to a subscription handler for processing
 type Event interface {
+	// Context return context.Context for event
+	Context() context.Context
 	// Topic returns event topic
 	Topic() string
 	// Message returns broker message

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

broker/memory/memory_test.go

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

broker/noop.go

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

broker/noop_test.go

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

broker/options.go

@@ -8,7 +8,9 @@ import (
 	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/logger"
 	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/register"
+	"go.unistack.org/micro/v3/sync"
 	"go.unistack.org/micro/v3/tracer"
 )
 
@@ -36,17 +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,
+		Register:        register.DefaultRegister,
-		Logger:   logger.DefaultLogger,
+		Logger:          logger.DefaultLogger,
-		Context:  context.Background(),
+		Context:         context.Background(),
-		Meter:    meter.DefaultMeter,
+		Meter:           meter.DefaultMeter,
-		Codec:    codec.DefaultCodec,
+		Codec:           codec.DefaultCodec,
-		Tracer:   tracer.DefaultTracer,
+		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

@@ -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...)}
+	n := &noopClient{opts: NewOptions(opts...)}
-	// wrap in reverse
 
-	c := Client(nc)
+	n.funcCall = n.fnCall
+	n.funcStream = n.fnStream
+	n.funcPublish = n.fnPublish
+	n.funcBatchPublish = n.fnBatchPublish
 
-	for i := len(nc.opts.Wrappers); i > 0; i-- {
+	return n
-		c = nc.opts.Wrappers[i-1](c)
-	}
-
-	return c
 }
 
 func (n *noopClient) Name() string {
@@ -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
+	hcall := func(ctx context.Context, addr string, req Request, rsp interface{}, opts CallOptions) error {
-
+		return nil
-	// wrap the call in reverse
-	for i := len(callOpts.CallWrappers); i > 0; i-- {
-		hcall = callOpts.CallWrappers[i-1](hcall)
 	}
 
 	// use the router passed as a call option, or fallback to the rpc clients router
@@ -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...)
 }
 
@@ -485,29 +571,35 @@ func (n *noopClient) publish(ctx context.Context, ps []Message, opts ...PublishO
 
 	msgs := make([]*broker.Message, 0, len(ps))
 
-	for _, p := range ps {
+	// get proxy
-		md, ok := metadata.FromOutgoingContext(ctx)
+	exchange := ""
-		if !ok {
+	if v, ok := os.LookupEnv("MICRO_PROXY"); ok {
-			md = metadata.New(0)
+		exchange = v
-		}
+	}
+	// 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 := metadata.Copy(omd)
+		md[metadata.HeaderContentType] = p.ContentType()
+		topic := p.Topic()
+		if len(exchange) > 0 {
+			topic = exchange
+		}
+		md[metadata.HeaderTopic] = topic
 		iter := p.Metadata().Iterator()
 		var k, v string
 		for iter.Next(&k, &v) {
 			md.Set(k, v)
 		}
 
-		md[metadata.HeaderContentType] = p.ContentType()
-
-		topic := p.Topic()
-
-		// get the exchange
-		if len(options.Exchange) > 0 {
-			topic = options.Exchange
-		}
-
-		md[metadata.HeaderTopic] = topic
-
 		var body []byte
 
 		// passed in raw data
@@ -531,6 +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
+}

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

config/default.go

@@ -7,15 +7,18 @@ import (
 	"strings"
 	"time"
 
+	"dario.cat/mergo"
 	"github.com/google/uuid"
-	"github.com/imdario/mergo"
+	"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 {
@@ -31,6 +34,18 @@ func (c *defaultConfig) Init(opts ...Option) error {
 		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
 	}
@@ -39,7 +54,17 @@ func (c *defaultConfig) Init(opts ...Option) error {
 }
 
 func (c *defaultConfig) Load(ctx context.Context, opts ...LoadOption) error {
-	if err := DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
+	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
 	}
 
@@ -229,6 +254,7 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(v))
 	}
+
 	return nil
 }
 
@@ -292,6 +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
 	}
@@ -311,7 +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
 }
 
@@ -321,5 +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

@@ -41,6 +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}

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"
 )
 
@@ -42,6 +43,12 @@ type Options struct {
 	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
@@ -68,9 +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
@@ -284,3 +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...)
+	}
+}

errors/errors.go

@@ -44,6 +44,20 @@ var (
 	ErrGatewayTimeout = &Error{Code: 504}
 )
 
+const ProblemContentType = "application/problem+json"
+
+type Problem struct {
+	Type     string `json:"type,omitempty"`
+	Title    string `json:"title,omitempty"`
+	Detail   string `json:"detail,omitempty"`
+	Instance string `json:"instance,omitempty"`
+	Errors   []struct {
+		Title  string `json:"title,omitempty"`
+		Detail string `json:"detail,omitempty"`
+	} `json:"errors,omitempty"`
+	Status int `json:"status,omitempty"`
+}
+
 // Error type
 type Error struct {
 	// ID holds error id or service, usually someting like my_service or id
@@ -262,6 +276,10 @@ 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
 	}

go.mod

@@ -1,11 +1,11 @@
 module go.unistack.org/micro/v3
 
-go 1.19
+go 1.20
 
 require (
+	dario.cat/mergo v1.0.0
 	github.com/DATA-DOG/go-sqlmock v1.5.0
 	github.com/google/uuid v1.3.0
-	github.com/imdario/mergo v0.3.15
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5
 	golang.org/x/sync v0.3.0

go.sum

@@ -1,3 +1,5 @@
+dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
 github.com/DATA-DOG/go-sqlmock v1.5.0 h1:Shsta01QNfFxHCfpW6YH2STWB0MudeXXEWMr20OEh60=
 github.com/DATA-DOG/go-sqlmock v1.5.0/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
@@ -7,8 +9,6 @@ github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/imdario/mergo v0.3.15 h1:M8XP7IuFNsqUx6VPK2P9OSmsYsI/YFaGil0uD21V3dM=
-github.com/imdario/mergo v0.3.15/go.mod h1:WBLT9ZmE3lPoWsEzCh9LPo3TiwVN+ZKEjmz+hD27ysY=
 github.com/patrickmn/go-cache v2.1.0+incompatible h1:HRMgzkcYKYpi3C8ajMPV8OFXaaRUnok+kx1WdO15EQc=
 github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
 github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5 h1:G/FZtUu7a6NTWl3KUHMV9jkLAh/Rvtf03NWMHaEDl+E=

logger/context.go

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

logger/default.go

@@ -1,230 +0,0 @@
-package logger
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"os"
-	"runtime"
-	"strings"
-	"sync"
-	"time"
-)
-
-type defaultLogger struct {
-	enc  *json.Encoder
-	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
-	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)
-	}
-
-	l.Lock()
-	cl := &defaultLogger{opts: oldopts, enc: json.NewEncoder(l.opts.Out)}
-	l.Unlock()
-
-	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 {
-	l.RLock()
-	nl := &defaultLogger{opts: l.opts, enc: l.enc}
-	if len(fields) == 0 {
-		l.RUnlock()
-		return nl
-	} else if len(fields)%2 != 0 {
-		fields = fields[:len(fields)-1]
-	}
-	nl.opts.Fields = copyFields(l.opts.Fields)
-	nl.opts.Fields = append(nl.opts.Fields, fields...)
-	l.RUnlock()
-	return nl
-}
-
-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.Logf(ctx, InfoLevel, msg, args...)
-}
-
-func (l *defaultLogger) Errorf(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, ErrorLevel, msg, args...)
-}
-
-func (l *defaultLogger) Debugf(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, DebugLevel, msg, args...)
-}
-
-func (l *defaultLogger) Warnf(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, WarnLevel, msg, args...)
-}
-
-func (l *defaultLogger) Tracef(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(ctx, TraceLevel, msg, args...)
-}
-
-func (l *defaultLogger) Fatalf(ctx context.Context, msg string, args ...interface{}) {
-	l.Logf(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.enc = json.NewEncoder(l.opts.Out)
-	return l
-}

logger/logger.go

@@ -1,14 +1,17 @@
 // Package logger provides a log interface
-package logger // import "go.unistack.org/micro/v3/logger"
+package logger
 
 import (
 	"context"
-	"os"
 )
 
+type ContextAttrFunc func(ctx context.Context) []interface{}
+
+var DefaultContextAttrFuncs []ContextAttrFunc
+
 var (
 	// DefaultLogger variable
-	DefaultLogger = 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

@@ -1,138 +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)
-	}
-
-	nl := l.Fields("key", "val")
-
-	nl.Info(ctx, "message")
-	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
-		t.Fatalf("logger fields not works, buf contains: %s", buf.Bytes())
-	}
-}
-
-func TestFromContextWithFields(t *testing.T) {
-	ctx := context.TODO()
-	buf := bytes.NewBuffer(nil)
-	var ok bool
-	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
-	if err := l.Init(); err != nil {
-		t.Fatal(err)
-	}
-	nl := l.Fields("key", "val")
-
-	ctx = NewContext(ctx, nl)
-
-	l, ok = FromContext(ctx)
-	if !ok {
-		t.Fatalf("context does not have logger")
-	}
-
-	l.Info(ctx, "message")
-	if !bytes.Contains(buf.Bytes(), []byte(`"key":"val"`)) {
-		t.Fatalf("logger fields not works, buf contains: %s", buf.Bytes())
-	}
-}
-
-func TestClone(t *testing.T) {
-	ctx := context.TODO()
-	buf := bytes.NewBuffer(nil)
-	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())
-	}
-}

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 +3,14 @@ package logger
 import (
 	"context"
 	"io"
+	"log/slog"
 	"os"
+	"time"
+
+	"go.unistack.org/micro/v3/meter"
 )
 
-// Option func
+// Option func signature
 type Option func(*Options)
 
 // Options holds logger options
@@ -15,31 +19,68 @@ 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
-	// The logging level the logger should log
+	// Fields holds additional metadata
-	Level Level
+	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
+	// Meter used to count logs for specific level
+	Meter meter.Meter
 }
 
 // NewOptions creates new options struct
 func NewOptions(opts ...Option) Options {
 	options := Options{
-		Level:           DefaultLevel,
+		Level:            DefaultLevel,
-		Fields:          make([]interface{}, 0, 6),
+		Fields:           make([]interface{}, 0, 6),
-		Out:             os.Stderr,
+		Out:              os.Stderr,
-		CallerSkipCount: DefaultCallerSkipCount,
+		CallerSkipCount:  DefaultCallerSkipCount,
-		Context:         context.Background(),
+		Context:          context.Background(),
+		ContextAttrFuncs: DefaultContextAttrFuncs,
+		AddSource:        true,
+		TimeFunc:         time.Now,
+		Meter:            meter.DefaultMeter,
 	}
+
+	WithMicroKeys()(&options)
+
 	for _, o := range opts {
 		o(&options)
 	}
+
 	return options
 }
 
+// WithContextAttrFuncs appends default funcs for the context attrs filler
+func WithContextAttrFuncs(fncs ...ContextAttrFunc) Option {
+	return func(o *Options) {
+		o.ContextAttrFuncs = append(o.ContextAttrFuncs, fncs...)
+	}
+}
+
 // WithFields set default fields for the logger
 func WithFields(fields ...interface{}) Option {
 	return func(o *Options) {
@@ -61,6 +102,20 @@ 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) {
@@ -81,3 +136,68 @@ func WithName(n string) Option {
 		o.Name = n
 	}
 }
+
+// WithMeter sets the meter
+func WithMeter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
+// WithTimeFunc sets the func to obtain current time
+func WithTimeFunc(fn func() time.Time) Option {
+	return func(o *Options) {
+		o.TimeFunc = fn
+	}
+}
+
+func WithZapKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = "@timestamp"
+		o.LevelKey = "level"
+		o.MessageKey = "msg"
+		o.SourceKey = "caller"
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+func WithZerologKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = "time"
+		o.LevelKey = "level"
+		o.MessageKey = "message"
+		o.SourceKey = "caller"
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+func WithSlogKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = slog.TimeKey
+		o.LevelKey = slog.LevelKey
+		o.MessageKey = slog.MessageKey
+		o.SourceKey = slog.SourceKey
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+func WithMicroKeys() Option {
+	return func(o *Options) {
+		o.TimeKey = "timestamp"
+		o.LevelKey = "level"
+		o.MessageKey = "msg"
+		o.SourceKey = "caller"
+		o.StacktraceKey = "stacktrace"
+		o.ErrorKey = "error"
+	}
+}
+
+// WithAddCallerSkipCount add skip count for copy logger
+func WithAddCallerSkipCount(n int) Option {
+	return func(o *Options) {
+		o.CallerSkipCount += n
+	}
+}

logger/slog/slog.go

@@ -0,0 +1,583 @@
+package slog
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os"
+	"regexp"
+	"runtime"
+	"strconv"
+	"sync"
+
+	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v3/semconv"
+	"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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", lvl.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", lvl.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.InfoLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.InfoLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.DebugLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.DebugLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.TraceLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.TraceLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.ErrorLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.ErrorLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.FatalLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.FatalLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.WarnLevel.String()).Inc()
+	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{}) {
+	s.opts.Meter.Counter(semconv.LoggerMessageTotal, "level", logger.WarnLevel.String()).Inc()
+	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())
+	}
+}

metadata/metadata.go

@@ -98,11 +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/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
@@ -24,6 +24,13 @@ var (
 	DefaultSummaryQuantiles = []float64{0.5, 0.9, 0.97, 0.99, 1}
 	// DefaultSummaryWindow is the default window for summary
 	DefaultSummaryWindow = 5 * time.Minute
+	// DefaultSkipEndpoints is the slice of endpoint that must not be metered
+	DefaultSkipEndpoints = []string{
+		"MeterService.Metrics",
+		"HealthService.Live",
+		"HealthService.Ready",
+		"HealthService.Version",
+	}
 )
 
 // Meter is an interface for collecting and instrumenting metrics

meter/options.go

@@ -2,8 +2,6 @@ package meter
 
 import (
 	"context"
-
-	"go.unistack.org/micro/v3/logger"
 )
 
 // Option powers the configuration for metrics implementations:
@@ -11,8 +9,6 @@ type Option func(*Options)
 
 // Options for metrics implementations
 type Options struct {
-	// Logger used for logging
-	Logger logger.Logger
 	// Context holds external options
 	Context context.Context
 	// Name holds the meter name
@@ -39,7 +35,6 @@ func NewOptions(opt ...Option) Options {
 		Address:      DefaultAddress,
 		Path:         DefaultPath,
 		Context:      context.Background(),
-		Logger:       logger.DefaultLogger,
 		MetricPrefix: DefaultMetricPrefix,
 		LabelPrefix:  DefaultLabelPrefix,
 	}
@@ -95,13 +90,6 @@ func TimingObjectives(value map[float64]float64) Option {
 }
 */
 
-// Logger sets the logger
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
 // Labels sets the meter labels
 func Labels(ls ...string) Option {
 	return func(o *Options) {

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) {}

network/tunnel/broker/broker.go

@@ -305,6 +305,10 @@ func (t *tunEvent) SetError(err error) {
 	t.err = err
 }
 
+func (t *tunEvent) Context() context.Context {
+	return context.TODO()
+}
+
 // NewBroker returns new tunnel broker
 func NewBroker(opts ...broker.Option) (broker.Broker, error) {
 	options := broker.NewOptions(opts...)

options.go

@@ -269,15 +269,7 @@ func Logger(l logger.Logger, opts ...LoggerOption) Option {
 				}
 			}
 		}
-		for _, mtr := range o.Meters {
+		
-			for _, or := range lopts.meters {
-				if mtr.Name() == or || all {
-					if err = mtr.Init(meter.Logger(l)); err != nil {
-						return err
-					}
-				}
-			}
-		}
 		for _, trc := range o.Tracers {
 			for _, ot := range lopts.tracers {
 				if trc.Name() == ot || all {

options/hooks.go

@@ -1,4 +1,4 @@
-package options // import "go.unistack.org/micro/v3/options"
+package options
 
 // Hook func interface
 type Hook interface{}

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) {
+func (m *memory) LookupService(ctx context.Context, name string, opts ...register.LookupOption) ([]*register.Service, error) {
-	options := NewLookupOptions(opts...)
+	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))...)
+			srvs, err := m.LookupService(ctx, name, append(opts, register.LookupDomain(domain))...)
-			if err == ErrNotFound {
+			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) {
+func (m *memory) ListServices(ctx context.Context, opts ...register.ListOption) ([]*register.Service, error) {
-	options := NewListOptions(opts...)
+	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

@@ -6,14 +6,16 @@ import (
 	"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",
@@ -27,7 +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",
@@ -37,7 +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",
@@ -49,7 +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",
@@ -63,7 +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",
@@ -78,7 +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)
@@ -155,8 +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 {
+			if err != register.ErrNotFound {
-				t.Errorf("Expected error: %v, got: %v", ErrNotFound, err)
+				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))
@@ -171,7 +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)
 			}
 		}
@@ -200,7 +202,7 @@ 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)
 			}
 		}
@@ -249,34 +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))
@@ -284,7 +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/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/logger.go

@@ -0,0 +1,4 @@
+package semconv
+
+// LoggerMessageTotal specifies meter metric name for logger messages
+var LoggerMessageTotal = "logger_message_total"

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"
+)

semconv/store.go

@@ -0,0 +1,12 @@
+package semconv
+
+var (
+	// StoreRequestDurationSeconds specifies meter metric name
+	StoreRequestDurationSeconds = "store_request_duration_seconds"
+	// ClientRequestLatencyMicroseconds specifies meter metric name
+	StoreRequestLatencyMicroseconds = "store_request_latency_microseconds"
+	// StoreRequestTotal specifies meter metric name
+	StoreRequestTotal = "store_request_total"
+	// StoreRequestInflight specifies meter metric name
+	StoreRequestInflight = "store_request_inflight"
+)

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/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))
 		}
 	}
 
@@ -223,7 +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 {
@@ -254,11 +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])
@@ -294,7 +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()
@@ -308,13 +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()))
 		}
 	}
 
@@ -322,13 +411,13 @@ 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)
 			}
 		}
 	}
@@ -361,23 +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
@@ -389,7 +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)
 			}
 		}
 
@@ -402,12 +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)
 			}
 		}
 	}()
@@ -423,36 +512,33 @@ func (n *noopServer) Start() error {
 func (n *noopServer) subscribe() error {
 	config := n.Options()
 
-	cx := config.Context
+	subCtx := config.Context
-	var err error
-	var sub broker.Subscriber
 
 	for sb := range n.subscribers {
-		if sb.Options().Context != nil {
+
-			cx = sb.Options().Context
+		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),
 		}
 
-		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 {
+		if config.Logger.V(logger.InfoLevel) {
-			// batch processing handler
+			config.Logger.Info(n.opts.Context, "subscribing to topic: "+sb.Topic())
-			sub, err = config.Broker.BatchSubscribe(cx, sb.Topic(), n.createBatchSubHandler(sb, config), opts...)
-		} else {
-			// single processing handler
-			sub, err = config.Broker.Subscribe(cx, sb.Topic(), n.createSubHandler(sb, config), opts...)
 		}
 
+		sub, err := config.Broker.Subscribe(subCtx, sb.Topic(), n.createSubHandler(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}
 	}
 
@@ -478,3 +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

@@ -15,6 +15,7 @@ import (
 	"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"
 )
@@ -47,7 +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
@@ -68,12 +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
@@ -84,8 +79,11 @@ type Options struct {
 	MaxConn int
 	// DeregisterAttempts holds the number of deregister attempts before error
 	DeregisterAttempts int
-	// Hooks may contains SubscriberWrapper, HandlerWrapper or Server func wrapper
+	// 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
@@ -108,6 +106,7 @@ func NewOptions(opts ...Option) Options {
 		Version:          DefaultVersion,
 		ID:               id.Must(),
 		Namespace:        DefaultNamespace,
+		GracefulTimeout:  DefaultGracefulTimeout,
 	}
 
 	for _, o := range opts {
@@ -279,28 +278,7 @@ func Wait(wg *sync.WaitGroup) Option {
 		if wg == nil {
 			wg = new(sync.WaitGroup)
 		}
-		o.Wait = wg
+		o.Wait = msync.WrapWaitGroup(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)
 	}
 }
 
@@ -321,6 +299,13 @@ 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
@@ -356,8 +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
@@ -429,13 +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 {
@@ -450,3 +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 {}
+//	type Greeter struct {}
-//
-//      func (g *Greeter) Hello(context, request, response) error {
-//              return nil
-//      }
 //
+//	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"
+	subSig = "func(context.Context, interface{}) error"
-	batchSubSig = "func([]context.Context, []interface{}) error"
 )
 
 // Precompute the reflect type for error. Can't use error directly
 // because Typeof takes an empty interface value. This is annoying.
 var typeOfError = reflect.TypeOf((*error)(nil)).Elem()
 
-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)
+	r, _ := utf8.DecodeRuneInString(name)
-	return unicode.IsUpper(rune)
+	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",
+			return fmt.Errorf("subscriber %v has wrong number of return values: %v require signature %s",
-				name, typ.NumOut(), subSig, batchSubSig)
+				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",
+				return fmt.Errorf("subscriber %v.%v takes wrong number of args: %v required signature %s",
-					name, method.Name, method.Type.NumIn(), subSig, batchSubSig)
+					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",
+					"subscriber %v.%v has wrong number of return values: %v require signature %s",
-					name, method.Name, method.Type.NumOut(), subSig, batchSubSig)
+					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) createBatchSubHandler(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) 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 {
-			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 {
+func getNameIndex[T Namer](n string, ifaces []T) int {
-	values, ok := ifaces.([]interface{})
+	for idx, iface := range ifaces {
-	if !ok {
+		if iface.Name() == n {
-		return 0
-	}
-	for idx, iface := range values {
-		if ifc, ok := iface.(nameIface); ok && ifc.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) {
+func Test_getNameIndex(t *testing.T) {
-	item1 := &testItem{name: "first"}
+	items := []*testItem{{name: "test1"}, {name: "test2"}}
-	item2 := &testItem{name: "second"}
+	idx := getNameIndex("test2", items)
-	items := []interface{}{item1, item2}
+	if items[idx].Name() != "test2" {
-	if idx := getNameIndex("second", items); idx != 1 {
+		t.Fatal("getNameIndex wrong")
-		t.Fatalf("getNameIndex func error, item not found")
 	}
 }
 

store/memory/memory.go

@@ -1,4 +1,4 @@
-package store
+package memory
 
 import (
 	"context"
@@ -6,13 +6,15 @@ import (
 	"strings"
 	"time"
 
-	"github.com/patrickmn/go-cache"
+	cache "github.com/patrickmn/go-cache"
+	"go.unistack.org/micro/v3/options"
+	"go.unistack.org/micro/v3/store"
 )
 
 // NewStore returns a memory store
-func NewStore(opts ...Option) Store {
+func NewStore(opts ...store.Option) store.Store {
 	return &memoryStore{
-		opts:  NewOptions(opts...),
+		opts:  store.NewOptions(opts...),
 		store: cache.New(cache.NoExpiration, 5*time.Minute),
 	}
 }
@@ -27,8 +29,13 @@ func (m *memoryStore) Disconnect(ctx context.Context) error {
 }
 
 type memoryStore struct {
-	store *cache.Cache
+	funcRead   store.FuncRead
-	opts  Options
+	funcWrite  store.FuncWrite
+	funcExists store.FuncExists
+	funcList   store.FuncList
+	funcDelete store.FuncDelete
+	store      *cache.Cache
+	opts       store.Options
 }
 
 func (m *memoryStore) key(prefix, key string) string {
@@ -39,7 +46,7 @@ func (m *memoryStore) exists(prefix, key string) error {
 	key = m.key(prefix, key)
 	_, found := m.store.Get(key)
 	if !found {
-		return ErrNotFound
+		return store.ErrNotFound
 	}
 
 	return nil
@@ -50,12 +57,12 @@ func (m *memoryStore) get(prefix, key string, val interface{}) error {
 
 	r, found := m.store.Get(key)
 	if !found {
-		return ErrNotFound
+		return store.ErrNotFound
 	}
 
 	buf, ok := r.([]byte)
 	if !ok {
-		return ErrNotFound
+		return store.ErrNotFound
 	}
 
 	return m.opts.Codec.Unmarshal(buf, val)
@@ -100,10 +107,32 @@ func (m *memoryStore) list(prefix string, limit, offset uint) []string {
 	return allKeys
 }
 
-func (m *memoryStore) Init(opts ...Option) error {
+func (m *memoryStore) Init(opts ...store.Option) error {
 	for _, o := range opts {
 		o(&m.opts)
 	}
+
+	m.funcRead = m.fnRead
+	m.funcWrite = m.fnWrite
+	m.funcExists = m.fnExists
+	m.funcList = m.fnList
+	m.funcDelete = m.fnDelete
+
+	m.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case store.HookRead:
+			m.funcRead = h(m.funcRead)
+		case store.HookWrite:
+			m.funcWrite = h(m.funcWrite)
+		case store.HookExists:
+			m.funcExists = h(m.funcExists)
+		case store.HookList:
+			m.funcList = h(m.funcList)
+		case store.HookDelete:
+			m.funcDelete = h(m.funcDelete)
+		}
+	})
+
 	return nil
 }
 
@@ -115,24 +144,36 @@ func (m *memoryStore) Name() string {
 	return m.opts.Name
 }
 
-func (m *memoryStore) Exists(ctx context.Context, key string, opts ...ExistsOption) error {
+func (m *memoryStore) Exists(ctx context.Context, key string, opts ...store.ExistsOption) error {
-	options := NewExistsOptions(opts...)
+	return m.funcExists(ctx, key, opts...)
+}
+
+func (m *memoryStore) fnExists(ctx context.Context, key string, opts ...store.ExistsOption) error {
+	options := store.NewExistsOptions(opts...)
 	if options.Namespace == "" {
 		options.Namespace = m.opts.Namespace
 	}
 	return m.exists(options.Namespace, key)
 }
 
-func (m *memoryStore) Read(ctx context.Context, key string, val interface{}, opts ...ReadOption) error {
+func (m *memoryStore) Read(ctx context.Context, key string, val interface{}, opts ...store.ReadOption) error {
-	options := NewReadOptions(opts...)
+	return m.funcRead(ctx, key, val, opts...)
+}
+
+func (m *memoryStore) fnRead(ctx context.Context, key string, val interface{}, opts ...store.ReadOption) error {
+	options := store.NewReadOptions(opts...)
 	if options.Namespace == "" {
 		options.Namespace = m.opts.Namespace
 	}
 	return m.get(options.Namespace, key, val)
 }
 
-func (m *memoryStore) Write(ctx context.Context, key string, val interface{}, opts ...WriteOption) error {
+func (m *memoryStore) Write(ctx context.Context, key string, val interface{}, opts ...store.WriteOption) error {
-	options := NewWriteOptions(opts...)
+	return m.funcWrite(ctx, key, val, opts...)
+}
+
+func (m *memoryStore) fnWrite(ctx context.Context, key string, val interface{}, opts ...store.WriteOption) error {
+	options := store.NewWriteOptions(opts...)
 	if options.Namespace == "" {
 		options.Namespace = m.opts.Namespace
 	}
@@ -151,8 +192,12 @@ func (m *memoryStore) Write(ctx context.Context, key string, val interface{}, op
 	return nil
 }
 
-func (m *memoryStore) Delete(ctx context.Context, key string, opts ...DeleteOption) error {
+func (m *memoryStore) Delete(ctx context.Context, key string, opts ...store.DeleteOption) error {
-	options := NewDeleteOptions(opts...)
+	return m.funcDelete(ctx, key, opts...)
+}
+
+func (m *memoryStore) fnDelete(ctx context.Context, key string, opts ...store.DeleteOption) error {
+	options := store.NewDeleteOptions(opts...)
 	if options.Namespace == "" {
 		options.Namespace = m.opts.Namespace
 	}
@@ -161,12 +206,16 @@ func (m *memoryStore) Delete(ctx context.Context, key string, opts ...DeleteOpti
 	return nil
 }
 
-func (m *memoryStore) Options() Options {
+func (m *memoryStore) Options() store.Options {
 	return m.opts
 }
 
-func (m *memoryStore) List(ctx context.Context, opts ...ListOption) ([]string, error) {
+func (m *memoryStore) List(ctx context.Context, opts ...store.ListOption) ([]string, error) {
-	options := NewListOptions(opts...)
+	return m.funcList(ctx, opts...)
+}
+
+func (m *memoryStore) fnList(ctx context.Context, opts ...store.ListOption) ([]string, error) {
+	options := store.NewListOptions(opts...)
 	if options.Namespace == "" {
 		options.Namespace = m.opts.Namespace
 	}

store/memory/memory_test.go

@@ -1,4 +1,4 @@
-package store_test
+package memory
 
 import (
 	"context"
@@ -8,8 +8,41 @@ import (
 	"go.unistack.org/micro/v3/store"
 )
 
+type testHook struct {
+	f bool
+}
+
+func (t *testHook) Exists(fn store.FuncExists) store.FuncExists {
+	return func(ctx context.Context, key string, opts ...store.ExistsOption) error {
+		t.f = true
+		return fn(ctx, key, opts...)
+	}
+}
+
+func TestHook(t *testing.T) {
+	h := &testHook{}
+
+	s := NewStore(store.Hooks(store.HookExists(h.Exists)))
+
+	if err := s.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := s.Write(context.TODO(), "test", nil); err != nil {
+		t.Error(err)
+	}
+
+	if err := s.Exists(context.TODO(), "test"); err != nil {
+		t.Fatal(err)
+	}
+
+	if !h.f {
+		t.Fatal("hook not works")
+	}
+}
+
 func TestMemoryReInit(t *testing.T) {
-	s := store.NewStore(store.Namespace("aaa"))
+	s := NewStore(store.Namespace("aaa"))
 	if err := s.Init(store.Namespace("")); err != nil {
 		t.Fatal(err)
 	}
@@ -19,7 +52,7 @@ func TestMemoryReInit(t *testing.T) {
 }
 
 func TestMemoryBasic(t *testing.T) {
-	s := store.NewStore()
+	s := NewStore()
 	if err := s.Init(); err != nil {
 		t.Fatal(err)
 	}
@@ -27,7 +60,7 @@ func TestMemoryBasic(t *testing.T) {
 }
 
 func TestMemoryPrefix(t *testing.T) {
-	s := store.NewStore()
+	s := NewStore()
 	if err := s.Init(store.Namespace("some-prefix")); err != nil {
 		t.Fatal(err)
 	}
@@ -35,7 +68,7 @@ func TestMemoryPrefix(t *testing.T) {
 }
 
 func TestMemoryNamespace(t *testing.T) {
-	s := store.NewStore()
+	s := NewStore()
 	if err := s.Init(store.Namespace("some-namespace")); err != nil {
 		t.Fatal(err)
 	}
@@ -43,7 +76,7 @@ func TestMemoryNamespace(t *testing.T) {
 }
 
 func TestMemoryNamespacePrefix(t *testing.T) {
-	s := store.NewStore()
+	s := NewStore()
 	if err := s.Init(store.Namespace("some-namespace")); err != nil {
 		t.Fatal(err)
 	}

store/noop.go

@@ -0,0 +1,147 @@
+package store
+
+import (
+	"context"
+
+	"go.unistack.org/micro/v3/options"
+)
+
+var _ Store = (*noopStore)(nil)
+
+type noopStore struct {
+	funcRead   FuncRead
+	funcWrite  FuncWrite
+	funcExists FuncExists
+	funcList   FuncList
+	funcDelete FuncDelete
+	opts       Options
+}
+
+func NewStore(opts ...Option) *noopStore {
+	options := NewOptions(opts...)
+	return &noopStore{opts: options}
+}
+
+func (n *noopStore) Init(opts ...Option) error {
+	for _, o := range opts {
+		o(&n.opts)
+	}
+
+	n.funcRead = n.fnRead
+	n.funcWrite = n.fnWrite
+	n.funcExists = n.fnExists
+	n.funcList = n.fnList
+	n.funcDelete = n.fnDelete
+
+	n.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case HookRead:
+			n.funcRead = h(n.funcRead)
+		case HookWrite:
+			n.funcWrite = h(n.funcWrite)
+		case HookExists:
+			n.funcExists = h(n.funcExists)
+		case HookList:
+			n.funcList = h(n.funcList)
+		case HookDelete:
+			n.funcDelete = h(n.funcDelete)
+		}
+	})
+
+	return nil
+}
+
+func (n *noopStore) Connect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}
+
+func (n *noopStore) Disconnect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}
+
+func (n *noopStore) Read(ctx context.Context, key string, val interface{}, opts ...ReadOption) error {
+	return n.funcRead(ctx, key, val, opts...)
+}
+
+func (n *noopStore) fnRead(ctx context.Context, key string, val interface{}, opts ...ReadOption) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}
+
+func (n *noopStore) Delete(ctx context.Context, key string, opts ...DeleteOption) error {
+	return n.funcDelete(ctx, key, opts...)
+}
+
+func (n *noopStore) fnDelete(ctx context.Context, key string, opts ...DeleteOption) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}
+
+func (n *noopStore) Exists(ctx context.Context, key string, opts ...ExistsOption) error {
+	return n.funcExists(ctx, key, opts...)
+}
+
+func (n *noopStore) fnExists(ctx context.Context, key string, opts ...ExistsOption) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}
+
+func (n *noopStore) Write(ctx context.Context, key string, val interface{}, opts ...WriteOption) error {
+	return n.funcWrite(ctx, key, val, opts...)
+}
+
+func (n *noopStore) fnWrite(ctx context.Context, key string, val interface{}, opts ...WriteOption) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}
+
+func (n *noopStore) List(ctx context.Context, opts ...ListOption) ([]string, error) {
+	return n.funcList(ctx, opts...)
+}
+
+func (n *noopStore) fnList(ctx context.Context, opts ...ListOption) ([]string, error) {
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	default:
+	}
+	return nil, nil
+}
+
+func (n *noopStore) Name() string {
+	return n.opts.Name
+}
+
+func (n *noopStore) String() string {
+	return "noop"
+}
+
+func (n *noopStore) Options() Options {
+	return n.opts
+}

store/noop_test.go

@@ -0,0 +1,35 @@
+package store
+
+import (
+	"context"
+	"testing"
+)
+
+type testHook struct {
+	f bool
+}
+
+func (t *testHook) Exists(fn FuncExists) FuncExists {
+	return func(ctx context.Context, key string, opts ...ExistsOption) error {
+		t.f = true
+		return fn(ctx, key, opts...)
+	}
+}
+
+func TestHook(t *testing.T) {
+	h := &testHook{}
+
+	s := NewStore(Hooks(HookExists(h.Exists)))
+
+	if err := s.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := s.Exists(context.TODO(), "test"); err != nil {
+		t.Fatal(err)
+	}
+
+	if !h.f {
+		t.Fatal("hook not works")
+	}
+}

store/options.go

@@ -9,6 +9,7 @@ import (
 	"go.unistack.org/micro/v3/logger"
 	"go.unistack.org/micro/v3/metadata"
 	"go.unistack.org/micro/v3/meter"
+	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/tracer"
 )
 
@@ -38,6 +39,8 @@ type Options struct {
 	// Wrappers []Wrapper
 	// Timeout specifies timeout duration for all operations
 	Timeout time.Duration
+	// Hooks can be run before/after store Read/List/Write/Exists/Delete
+	Hooks options.Hooks
 }
 
 // NewOptions creates options struct
@@ -144,6 +147,10 @@ type ReadOptions struct {
 	Context context.Context
 	// Namespace holds namespace
 	Namespace string
+	// Name holds mnemonic name
+	Name string
+	// Timeout specifies max timeout for operation
+	Timeout time.Duration
 }
 
 // NewReadOptions fills ReadOptions struct with opts slice
@@ -158,6 +165,20 @@ func NewReadOptions(opts ...ReadOption) ReadOptions {
 // ReadOption sets values in ReadOptions
 type ReadOption func(r *ReadOptions)
 
+// ReadTimeout pass timeout to ReadOptions
+func ReadTimeout(td time.Duration) ReadOption {
+	return func(o *ReadOptions) {
+		o.Timeout = td
+	}
+}
+
+// ReadName pass name to ReadOptions
+func ReadName(name string) ReadOption {
+	return func(o *ReadOptions) {
+		o.Name = name
+	}
+}
+
 // ReadContext pass context.Context to ReadOptions
 func ReadContext(ctx context.Context) ReadOption {
 	return func(o *ReadOptions) {
@@ -180,6 +201,10 @@ type WriteOptions struct {
 	Metadata metadata.Metadata
 	// Namespace holds namespace
 	Namespace string
+	// Name holds mnemonic name
+	Name string
+	// Timeout specifies max timeout for operation
+	Timeout time.Duration
 	// TTL specifies key TTL
 	TTL time.Duration
 }
@@ -224,12 +249,30 @@ func WriteNamespace(ns string) WriteOption {
 	}
 }
 
+// WriteName pass name to WriteOptions
+func WriteName(name string) WriteOption {
+	return func(o *WriteOptions) {
+		o.Name = name
+	}
+}
+
+// WriteTimeout pass timeout to WriteOptions
+func WriteTimeout(td time.Duration) WriteOption {
+	return func(o *WriteOptions) {
+		o.Timeout = td
+	}
+}
+
 // DeleteOptions configures an individual Delete operation
 type DeleteOptions struct {
 	// Context holds external options
 	Context context.Context
 	// Namespace holds namespace
 	Namespace string
+	// Name holds mnemonic name
+	Name string
+	// Timeout specifies max timeout for operation
+	Timeout time.Duration
 }
 
 // NewDeleteOptions fills DeleteOptions struct with opts slice
@@ -258,14 +301,32 @@ func DeleteNamespace(ns string) DeleteOption {
 	}
 }
 
+// DeleteName pass name to DeleteOptions
+func DeleteName(name string) DeleteOption {
+	return func(o *DeleteOptions) {
+		o.Name = name
+	}
+}
+
+// DeleteTimeout pass timeout to DeleteOptions
+func DeleteTimeout(td time.Duration) DeleteOption {
+	return func(o *DeleteOptions) {
+		o.Timeout = td
+	}
+}
+
 // ListOptions configures an individual List operation
 type ListOptions struct {
 	Context   context.Context
 	Prefix    string
 	Suffix    string
 	Namespace string
-	Limit     uint
+	// Name holds mnemonic name
-	Offset    uint
+	Name   string
+	Limit  uint
+	Offset uint
+	// Timeout specifies max timeout for operation
+	Timeout time.Duration
 }
 
 // NewListOptions fills ListOptions struct with opts slice
@@ -322,12 +383,23 @@ func ListNamespace(ns string) ListOption {
 	}
 }
 
+// ListTimeout pass timeout to ListOptions
+func ListTimeout(td time.Duration) ListOption {
+	return func(o *ListOptions) {
+		o.Timeout = td
+	}
+}
+
 // ExistsOptions holds options for Exists method
 type ExistsOptions struct {
 	// Context holds external options
 	Context context.Context
 	// Namespace contains namespace
 	Namespace string
+	// Name holds mnemonic name
+	Name string
+	// Timeout specifies max timeout for operation
+	Timeout time.Duration
 }
 
 // ExistsOption specifies Exists call options
@@ -358,11 +430,23 @@ func ExistsNamespace(ns string) ExistsOption {
 	}
 }
 
-/*
+// ExistsName pass name to exist options
-// WrapStore adds a store Wrapper to a list of options passed into the store
+func ExistsName(name string) ExistsOption {
-func WrapStore(w Wrapper) Option {
+	return func(o *ExistsOptions) {
-	return func(o *Options) {
+		o.Name = name
-		o.Wrappers = append(o.Wrappers, w)
+	}
+}
+
+// ExistsTimeout timeout to ListOptions
+func ExistsTimeout(td time.Duration) ExistsOption {
+	return func(o *ExistsOptions) {
+		o.Timeout = td
+	}
+}
+
+// Hooks sets hook runs before action
+func Hooks(h ...options.Hook) Option {
+	return func(o *Options) {
+		o.Hooks = append(o.Hooks, h...)
 	}
 }
-*/

store/store.go

@@ -12,13 +12,14 @@ var (
 	// ErrInvalidKey is returned when a key has empty or have invalid format
 	ErrInvalidKey = errors.New("invalid key")
 	// DefaultStore is the global default store
-	DefaultStore = NewStore()
+	DefaultStore Store = NewStore()
 	// DefaultSeparator is the gloabal default key parts separator
 	DefaultSeparator = "/"
 )
 
 // Store is a data storage interface
 type Store interface {
+	// Name returns store name
 	Name() string
 	// Init initialises the store
 	Init(opts ...Option) error
@@ -41,3 +42,16 @@ type Store interface {
 	// String returns the name of the implementation.
 	String() string
 }
+
+type (
+	FuncExists func(ctx context.Context, key string, opts ...ExistsOption) error
+	HookExists func(next FuncExists) FuncExists
+	FuncRead   func(ctx context.Context, key string, val interface{}, opts ...ReadOption) error
+	HookRead   func(next FuncRead) FuncRead
+	FuncWrite  func(ctx context.Context, key string, val interface{}, opts ...WriteOption) error
+	HookWrite  func(next FuncWrite) FuncWrite
+	FuncDelete func(ctx context.Context, key string, opts ...DeleteOption) error
+	HookDelete func(next FuncDelete) FuncDelete
+	FuncList   func(ctx context.Context, opts ...ListOption) ([]string, error)
+	HookList   func(next FuncList) FuncList
+)

sync/waitgroup.go

@@ -0,0 +1,69 @@
+package sync
+
+import (
+	"context"
+	"sync"
+)
+
+type WaitGroup struct {
+	wg *sync.WaitGroup
+	c  int
+	mu sync.Mutex
+}
+
+func WrapWaitGroup(wg *sync.WaitGroup) *WaitGroup {
+	g := &WaitGroup{
+		wg: wg,
+	}
+	return g
+}
+
+func NewWaitGroup() *WaitGroup {
+	var wg sync.WaitGroup
+	return WrapWaitGroup(&wg)
+}
+
+func (g *WaitGroup) Add(n int) {
+	g.mu.Lock()
+	g.c += n
+	g.wg.Add(n)
+	g.mu.Unlock()
+}
+
+func (g *WaitGroup) Done() {
+	g.mu.Lock()
+	g.c += -1
+	g.wg.Add(-1)
+	g.mu.Unlock()
+}
+
+func (g *WaitGroup) Wait() {
+	g.wg.Wait()
+}
+
+func (g *WaitGroup) WaitContext(ctx context.Context) {
+	done := make(chan struct{})
+	go func() {
+		g.wg.Wait()
+		close(done)
+	}()
+
+	select {
+	case <-ctx.Done():
+		g.mu.Lock()
+		g.wg.Add(-g.c)
+		<-done
+		g.wg.Add(g.c)
+		g.mu.Unlock()
+		return
+	case <-done:
+		return
+	}
+}
+
+func (g *WaitGroup) Waiters() int {
+	g.mu.Lock()
+	c := g.c
+	g.mu.Unlock()
+	return c
+}

sync/waitgroup_test.go

@@ -0,0 +1,37 @@
+package sync
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+func TestWaitGroupContext(t *testing.T) {
+	wg := NewWaitGroup()
+	_ = t
+	wg.Add(1)
+	ctx, cancel := context.WithTimeout(context.TODO(), 1*time.Second)
+	defer cancel()
+	wg.WaitContext(ctx)
+}
+
+func TestWaitGroupReuse(t *testing.T) {
+	wg := NewWaitGroup()
+	defer func() {
+		if wg.Waiters() != 0 {
+			t.Fatal("lost goroutines")
+		}
+	}()
+
+	wg.Add(1)
+	defer wg.Done()
+	ctx, cancel := context.WithTimeout(context.TODO(), 1*time.Second)
+	defer cancel()
+	wg.WaitContext(ctx)
+
+	wg.Add(1)
+	defer wg.Done()
+	ctx, cancel = context.WithTimeout(context.TODO(), 1*time.Second)
+	defer cancel()
+	wg.WaitContext(ctx)
+}

tracer/memory/memory.go

@@ -0,0 +1,139 @@
+package memory
+
+import (
+	"context"
+	"time"
+
+	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v3/util/id"
+)
+
+var _ tracer.Tracer = (*Tracer)(nil)
+
+type Tracer struct {
+	opts  tracer.Options
+	spans []tracer.Span
+}
+
+func (t *Tracer) Spans() []tracer.Span {
+	return t.spans
+}
+
+func (t *Tracer) Start(ctx context.Context, name string, opts ...tracer.SpanOption) (context.Context, tracer.Span) {
+	options := tracer.NewSpanOptions(opts...)
+	span := &Span{
+		name:      name,
+		ctx:       ctx,
+		tracer:    t,
+		kind:      options.Kind,
+		startTime: time.Now(),
+	}
+	span.spanID.s, _ = id.New()
+	span.traceID.s, _ = id.New()
+	if span.ctx == nil {
+		span.ctx = context.Background()
+	}
+	t.spans = append(t.spans, span)
+	return tracer.NewSpanContext(ctx, span), span
+}
+
+func (t *Tracer) Flush(_ context.Context) error {
+	return nil
+}
+
+func (t *Tracer) Init(opts ...tracer.Option) error {
+	for _, o := range opts {
+		o(&t.opts)
+	}
+	return nil
+}
+
+func (t *Tracer) Name() string {
+	return t.opts.Name
+}
+
+type noopStringer struct {
+	s string
+}
+
+func (s noopStringer) String() string {
+	return s.s
+}
+
+type Span struct {
+	ctx        context.Context
+	tracer     tracer.Tracer
+	name       string
+	statusMsg  string
+	startTime  time.Time
+	finishTime time.Time
+	traceID    noopStringer
+	spanID     noopStringer
+	events     []*Event
+	labels     []interface{}
+	logs       []interface{}
+	kind       tracer.SpanKind
+	status     tracer.SpanStatus
+}
+
+func (s *Span) Finish(_ ...tracer.SpanOption) {
+	s.finishTime = time.Now()
+}
+
+func (s *Span) Context() context.Context {
+	return s.ctx
+}
+
+func (s *Span) Tracer() tracer.Tracer {
+	return s.tracer
+}
+
+type Event struct {
+	name   string
+	labels []interface{}
+}
+
+func (s *Span) AddEvent(name string, opts ...tracer.EventOption) {
+	options := tracer.NewEventOptions(opts...)
+	s.events = append(s.events, &Event{name: name, labels: options.Labels})
+}
+
+func (s *Span) SetName(name string) {
+	s.name = name
+}
+
+func (s *Span) AddLogs(kv ...interface{}) {
+	s.logs = append(s.logs, kv...)
+}
+
+func (s *Span) AddLabels(kv ...interface{}) {
+	s.labels = append(s.labels, kv...)
+}
+
+func (s *Span) Kind() tracer.SpanKind {
+	return s.kind
+}
+
+func (s *Span) TraceID() string {
+	return s.traceID.String()
+}
+
+func (s *Span) SpanID() string {
+	return s.spanID.String()
+}
+
+func (s *Span) Status() (tracer.SpanStatus, string) {
+	return s.status, s.statusMsg
+}
+
+func (s *Span) SetStatus(st tracer.SpanStatus, msg string) {
+	s.status = st
+	s.statusMsg = msg
+}
+
+// NewTracer returns new memory tracer
+func NewTracer(opts ...tracer.Option) *Tracer {
+	return &Tracer{
+		opts: tracer.NewOptions(opts...),
+	}
+}

tracer/memory/memory_test.go

@@ -0,0 +1,38 @@
+package memory
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+
+	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v3/logger/slog"
+	"go.unistack.org/micro/v3/tracer"
+)
+
+func TestLoggerWithTracer(t *testing.T) {
+	ctx := context.TODO()
+	buf := bytes.NewBuffer(nil)
+	logger.DefaultLogger = slog.NewLogger(logger.WithOutput(buf))
+
+	if err := logger.Init(); err != nil {
+		t.Fatal(err)
+	}
+	var span tracer.Span
+	tr := NewTracer()
+	ctx, span = tr.Start(ctx, "test1")
+
+	logger.Error(ctx, "my test error", fmt.Errorf("error"))
+
+	if !strings.Contains(buf.String(), span.TraceID()) {
+		t.Fatalf("log does not contains trace id: %s", buf.Bytes())
+	}
+
+	_, _ = tr.Start(ctx, "test2")
+
+	for _, s := range tr.Spans() {
+		_ = s
+	}
+}

tracer/noop.go

@@ -2,6 +2,8 @@ package tracer
 
 import (
 	"context"
+
+	"go.unistack.org/micro/v3/util/id"
 )
 
 var _ Tracer = (*noopTracer)(nil)
@@ -24,6 +26,8 @@ func (t *noopTracer) Start(ctx context.Context, name string, opts ...SpanOption)
 		labels: options.Labels,
 		kind:   options.Kind,
 	}
+	span.spanID.s, _ = id.New()
+	span.traceID.s, _ = id.New()
 	if span.ctx == nil {
 		span.ctx = context.Background()
 	}
@@ -31,6 +35,14 @@ func (t *noopTracer) Start(ctx context.Context, name string, opts ...SpanOption)
 	return NewSpanContext(ctx, span), span
 }
 
+type noopStringer struct {
+	s string
+}
+
+func (s noopStringer) String() string {
+	return s.s
+}
+
 func (t *noopTracer) Flush(ctx context.Context) error {
 	return nil
 }
@@ -56,6 +68,8 @@ type noopSpan struct {
 	tracer    Tracer
 	name      string
 	statusMsg string
+	traceID   noopStringer
+	spanID    noopStringer
 	events    []*noopEvent
 	labels    []interface{}
 	logs      []interface{}
@@ -63,7 +77,15 @@ type noopSpan struct {
 	status    SpanStatus
 }
 
-func (s *noopSpan) Finish(opts ...SpanOption) {
+func (s *noopSpan) TraceID() string {
+	return s.traceID.String()
+}
+
+func (s *noopSpan) SpanID() string {
+	return s.spanID.String()
+}
+
+func (s *noopSpan) Finish(_ ...SpanOption) {
 }
 
 func (s *noopSpan) Context() context.Context {

tracer/options.go

@@ -83,8 +83,11 @@ func (sk SpanKind) String() string {
 
 // SpanOptions contains span option
 type SpanOptions struct {
-	Labels []interface{}
+	StatusMsg string
-	Kind   SpanKind
+	Labels    []interface{}
+	Status    SpanStatus
+	Kind      SpanKind
+	Record    bool
 }
 
 // SpanOption func signature
@@ -100,13 +103,20 @@ type EventOption func(o *EventOptions)
 
 func WithEventLabels(kv ...interface{}) EventOption {
 	return func(o *EventOptions) {
-		o.Labels = kv
+		o.Labels = append(o.Labels, kv...)
 	}
 }
 
 func WithSpanLabels(kv ...interface{}) SpanOption {
 	return func(o *SpanOptions) {
-		o.Labels = kv
+		o.Labels = append(o.Labels, kv...)
+	}
+}
+
+func WithSpanStatus(st SpanStatus, msg string) SpanOption {
+	return func(o *SpanOptions) {
+		o.Status = st
+		o.StatusMsg = msg
 	}
 }
 
@@ -116,6 +126,12 @@ func WithSpanKind(k SpanKind) SpanOption {
 	}
 }
 
+func WithSpanRecord(b bool) SpanOption {
+	return func(o *SpanOptions) {
+		o.Record = b
+	}
+}
+
 // Options struct
 type Options struct {
 	// Context used to store custome tracer options
@@ -124,6 +140,8 @@ type Options struct {
 	Logger logger.Logger
 	// Name of the tracer
 	Name string
+	// ContextAttrFuncs contains funcs that provides tracing
+	ContextAttrFuncs []ContextAttrFunc
 }
 
 // Option func signature
@@ -148,7 +166,8 @@ func NewEventOptions(opts ...EventOption) EventOptions {
 // NewSpanOptions returns default SpanOptions
 func NewSpanOptions(opts ...SpanOption) SpanOptions {
 	options := SpanOptions{
-		Kind: SpanKindInternal,
+		Kind:   SpanKindInternal,
+		Record: true,
 	}
 	for _, o := range opts {
 		o(&options)
@@ -159,7 +178,9 @@ func NewSpanOptions(opts ...SpanOption) SpanOptions {
 // NewOptions returns default options
 func NewOptions(opts ...Option) Options {
 	options := Options{
-		Logger: logger.DefaultLogger,
+		Logger:           logger.DefaultLogger,
+		Context:          context.Background(),
+		ContextAttrFuncs: DefaultContextAttrFuncs,
 	}
 	for _, o := range opts {
 		o(&options)

tracer/tracer.go

@@ -3,12 +3,41 @@ package tracer // import "go.unistack.org/micro/v3/tracer"
 
 import (
 	"context"
-	"fmt"
+
-	"sort"
+	"go.unistack.org/micro/v3/logger"
 )
 
-// DefaultTracer is the global default tracer
+var (
-var DefaultTracer = NewTracer()
+	// DefaultTracer is the global default tracer
+	DefaultTracer Tracer = NewTracer() //nolint:revive
+	// TraceIDKey is the key used for the trace id in the log call
+	TraceIDKey = "trace-id"
+	// SpanIDKey is the key used for the span id in the log call
+	SpanIDKey = "span-id"
+	// DefaultSkipEndpoints is the slice of endpoint that must not be traced
+	DefaultSkipEndpoints = []string{
+		"MeterService.Metrics",
+		"HealthService.Live",
+		"HealthService.Ready",
+		"HealthService.Version",
+	}
+	DefaultContextAttrFuncs []ContextAttrFunc
+)
+
+type ContextAttrFunc func(ctx context.Context) []interface{}
+
+func init() {
+	logger.DefaultContextAttrFuncs = append(logger.DefaultContextAttrFuncs,
+		func(ctx context.Context) []interface{} {
+			if span, ok := SpanFromContext(ctx); ok {
+				return []interface{}{
+					TraceIDKey, span.TraceID(),
+					SpanIDKey, span.SpanID(),
+				}
+			}
+			return nil
+		})
+}
 
 // Tracer is an interface for distributed tracing
 type Tracer interface {
@@ -18,6 +47,8 @@ type Tracer interface {
 	Init(...Option) error
 	// Start a trace
 	Start(ctx context.Context, name string, opts ...SpanOption) (context.Context, Span)
+	// Extract get span metadata from context
+	// Extract(ctx context.Context)
 	// Flush flushes spans
 	Flush(ctx context.Context) error
 }
@@ -43,38 +74,8 @@ type Span interface {
 	AddLogs(kv ...interface{})
 	// Kind returns span kind
 	Kind() SpanKind
-}
+	// TraceID returns trace id
-
+	TraceID() string
-// sort labels alphabeticaly by label name
+	// SpanID returns span id
-type byKey []interface{}
+	SpanID() string
-
-func (k byKey) Len() int           { return len(k) / 2 }
-func (k byKey) Less(i, j int) bool { return fmt.Sprintf("%s", k[i*2]) < fmt.Sprintf("%s", k[j*2]) }
-func (k byKey) Swap(i, j int) {
-	k[i*2], k[j*2] = k[j*2], k[i*2]
-	k[i*2+1], k[j*2+1] = k[j*2+1], k[i*2+1]
-}
-
-func UniqLabels(labels []interface{}) []interface{} {
-	if len(labels)%2 == 1 {
-		labels = labels[:len(labels)-1]
-	}
-
-	if len(labels) > 2 {
-		sort.Sort(byKey(labels))
-
-		idx := 0
-		for {
-			if labels[idx] == labels[idx+2] {
-				copy(labels[idx:], labels[idx+2:])
-				labels = labels[:len(labels)-2]
-			} else {
-				idx += 2
-			}
-			if idx+2 >= len(labels) {
-				break
-			}
-		}
-	}
-	return labels
 }

tracer/tracer_test.go

@@ -1,13 +0,0 @@
-package tracer
-
-import (
-	"testing"
-)
-
-func TestUniqLabels(t *testing.T) {
-	labels := []interface{}{"key1", "val1", "key1", "val2"}
-	labels = UniqLabels(labels)
-	if labels[1] != "val2" {
-		t.Fatalf("UniqLabels not works")
-	}
-}

util/reflect/reflect.go

@@ -1,6 +1,7 @@
-package reflect // import "go.unistack.org/micro/v3/util/reflect"
+package reflect
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"reflect"
@@ -45,15 +46,23 @@ func SliceAppend(b bool) Option {
 
 // Merge merges map[string]interface{} to destination struct
 func Merge(dst interface{}, mp map[string]interface{}, opts ...Option) error {
-	var err error
-	var sval reflect.Value
-	var fname string
-
 	options := Options{}
 	for _, o := range opts {
 		o(&options)
 	}
 
+	if unmarshaler, ok := dst.(json.Unmarshaler); ok {
+		buf, err := json.Marshal(mp)
+		if err == nil {
+			err = unmarshaler.UnmarshalJSON(buf)
+		}
+		return err
+	}
+
+	var err error
+	var sval reflect.Value
+	var fname string
+
 	dviface := reflect.ValueOf(dst)
 	if dviface.Kind() == reflect.Ptr {
 		dviface = dviface.Elem()

util/reflect/struct.go

@@ -25,6 +25,48 @@ type StructField struct {
 	Field reflect.StructField
 }
 
+// StructFieldNameByTag get struct field name by tag key and its value
+func StructFieldNameByTag(src interface{}, tkey string, tval string) (string, interface{}, error) {
+	sv := reflect.ValueOf(src)
+	if sv.Kind() == reflect.Ptr {
+		sv = sv.Elem()
+	}
+	if sv.Kind() != reflect.Struct {
+		return "", nil, ErrInvalidStruct
+	}
+
+	typ := sv.Type()
+	for idx := 0; idx < typ.NumField(); idx++ {
+		fld := typ.Field(idx)
+		val := sv.Field(idx)
+		if len(fld.PkgPath) != 0 {
+			continue
+		}
+
+		if ts, ok := fld.Tag.Lookup(tkey); ok {
+			for _, p := range strings.Split(ts, ",") {
+				if p == tval {
+					return fld.Name, val.Interface(), nil
+				}
+			}
+		}
+
+		switch val.Kind() {
+		case reflect.Ptr:
+			if val = val.Elem(); val.Kind() == reflect.Struct {
+				if name, fld, err := StructFieldNameByTag(val.Interface(), tkey, tval); err == nil {
+					return name, fld, nil
+				}
+			}
+		case reflect.Struct:
+			if name, fld, err := StructFieldNameByTag(val.Interface(), tkey, tval); err == nil {
+				return name, fld, nil
+			}
+		}
+	}
+	return "", nil, ErrNotFound
+}
+
 // StructFieldByTag get struct field by tag key and its value
 func StructFieldByTag(src interface{}, tkey string, tval string) (interface{}, error) {
 	sv := reflect.ValueOf(src)
@@ -46,9 +88,6 @@ func StructFieldByTag(src interface{}, tkey string, tval string) (interface{}, e
 		if ts, ok := fld.Tag.Lookup(tkey); ok {
 			for _, p := range strings.Split(ts, ",") {
 				if p == tval {
-					if val.Kind() != reflect.Ptr && val.CanAddr() {
-						val = val.Addr()
-					}
 					return val.Interface(), nil
 				}
 			}
@@ -72,10 +111,21 @@ func StructFieldByTag(src interface{}, tkey string, tval string) (interface{}, e
 
 // ZeroFieldByPath clean struct field by its path
 func ZeroFieldByPath(src interface{}, path string) error {
+	if src == nil {
+		return nil
+	}
 	var err error
 	val := reflect.ValueOf(src)
 
+	if IsEmpty(val) {
+		return nil
+	}
+
 	for _, p := range strings.Split(path, ".") {
+		if IsEmpty(val) {
+			return nil
+		}
+
 		val, err = structValueByName(val, p)
 		if err != nil {
 			return err
@@ -493,13 +543,14 @@ func btSplitter(str string) []string {
 }
 
 // queryToMap turns something like a[b][c]=4 into
-//   map[string]interface{}{
+//
-//     "a": map[string]interface{}{
+//	  map[string]interface{}{
-// 		  "b": map[string]interface{}{
+//	    "a": map[string]interface{}{
-// 			  "c": 4,
+//			  "b": map[string]interface{}{
-// 		  },
+//				  "c": 4,
-// 	  },
+//			  },
-//   }
+//		  },
+//	  }
 func queryToMap(param string) (map[string]interface{}, error) {
 	rawKey, rawValue, err := splitKeyAndValue(param)
 	if err != nil {

util/reflect/struct_test.go

@@ -190,9 +190,9 @@ func TestStructFieldByTag(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if v, ok := iface.(*[]string); !ok {
+	if v, ok := iface.([]string); !ok {
 		t.Fatalf("not *[]string %v", iface)
-	} else if len(*v) != 2 {
+	} else if len(v) != 2 {
 		t.Fatalf("invalid number %v", iface)
 	}
 }

util/sort/sort.go

@@ -0,0 +1,40 @@
+package sort
+
+import (
+	"fmt"
+	"sort"
+)
+
+// sort labels alphabeticaly by label name
+type byKey []interface{}
+
+func (k byKey) Len() int           { return len(k) / 2 }
+func (k byKey) Less(i, j int) bool { return fmt.Sprintf("%s", k[i*2]) < fmt.Sprintf("%s", k[j*2]) }
+func (k byKey) Swap(i, j int) {
+	k[i*2], k[j*2] = k[j*2], k[i*2]
+	k[i*2+1], k[j*2+1] = k[j*2+1], k[i*2+1]
+}
+
+func Uniq(labels []interface{}) []interface{} {
+	if len(labels)%2 == 1 {
+		labels = labels[:len(labels)-1]
+	}
+
+	if len(labels) > 2 {
+		sort.Sort(byKey(labels))
+
+		idx := 0
+		for {
+			if labels[idx] == labels[idx+2] {
+				copy(labels[idx:], labels[idx+2:])
+				labels = labels[:len(labels)-2]
+			} else {
+				idx += 2
+			}
+			if idx+2 >= len(labels) {
+				break
+			}
+		}
+	}
+	return labels
+}

util/time/duration_test.go

@@ -35,8 +35,8 @@ func TestUnmarshalJSON(t *testing.T) {
 	err = json.Unmarshal([]byte(`{"ttl":"1y"}`), v)
 	if err != nil {
 		t.Fatal(err)
-	} else if v.TTL != 31536000000000000 {
+	} else if v.TTL != 31622400000000000 {
-		t.Fatalf("invalid duration %v != 31536000000000000", v.TTL)
+		t.Fatalf("invalid duration %v != 31622400000000000", v.TTL)
 	}
 }
 
@@ -55,7 +55,7 @@ func TestParseDuration(t *testing.T) {
 	if err != nil {
 		t.Fatalf("ParseDuration error: %v", err)
 	}
-	if td.String() != "8760h0m0s" {
+	if td.String() != "8784h0m0s" {
-		t.Fatalf("ParseDuration 1y != 8760h0m0s : %s", td.String())
+		t.Fatalf("ParseDuration 1y != 8784h0m0s : %s", td.String())
 	}
 }

util/xpool/pool.go

@@ -0,0 +1,36 @@
+package pool
+
+import (
+	"bytes"
+	"sync"
+)
+
+type Pool[T any] struct {
+	p *sync.Pool
+}
+
+func NewPool[T any](fn func() T) Pool[T] {
+	return Pool[T]{
+		p: &sync.Pool{
+			New: func() interface{} {
+				return fn()
+			},
+		},
+	}
+}
+
+func (p Pool[T]) Get() T {
+	return p.p.Get().(T)
+}
+
+func (p Pool[T]) Put(t T) {
+	p.p.Put(t)
+}
+
+func NewBytePool(size int) Pool[T] {
+	return NewPool(func() []byte { return make([]byte, size) })
+}
+
+func NewBytesPool() Pool[T] {
+	return NewPool(func() *bytes.Buffer { return bytes.NewBuffer(nil) })
+}

util/xpool/pool_test.go

@@ -0,0 +1,27 @@
+package pool
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestBytes(t *testing.T) {
+	p := NewPool(func() *bytes.Buffer { return bytes.NewBuffer(nil) })
+	b := p.Get()
+	b.Write([]byte(`test`))
+	if b.String() != "test" {
+		t.Fatal("pool not works")
+	}
+	p.Put(b)
+}
+
+func TestStrings(t *testing.T) {
+	p := NewPool(func() *strings.Builder { return &strings.Builder{} })
+	b := p.Get()
+	b.Write([]byte(`test`))
+	if b.String() != "test" {
+		t.Fatal("pool not works")
+	}
+	p.Put(b)
+}