Merge pull request 'fix some options' (#237) from fixes into master

Reviewed-on: #237

README.md

@@ -1,4 +1,4 @@
-# Micro [![License](https://img.shields.io/:license-apache-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![Doc](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=flat-square)](https://pkg.go.dev/github.com/unistack-org/micro/v3?tab=overview) [![Status](https://github.com/unistack-org/micro/workflows/build/badge.svg?branch=master)](https://github.com/unistack-org/micro/actions?query=workflow%3Abuild+branch%3Amaster+event%3Apush) [![Lint](https://goreportcard.com/badge/go.unistack.org/micro/v3)](https://goreportcard.com/report/go.unistack.org/micro/v3) [![Coverage](https://codecov.io/gh/unistack-org/micro/branch/v3/graph/badge.svg?token=OZPO2LP7VS)](https://codecov.io/gh/unistack-org/micro)
+# Micro [![License](https://img.shields.io/:license-apache-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![Doc](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=flat-square)](https://pkg.go.dev/go.unistack.org/micro/v4?tab=overview) [![Status](https://github.com/unistack-org/micro/workflows/build/badge.svg?branch=master)](https://github.com/unistack-org/micro/actions?query=workflow%3Abuild+branch%3Amaster+event%3Apush) [![Lint](https://goreportcard.com/badge/go.unistack.org/micro/v4)](https://goreportcard.com/report/go.unistack.org/micro/v4) [![Coverage](https://codecov.io/gh/unistack-org/micro/branch/v4/graph/badge.svg?token=OZPO2LP7VS)](https://codecov.io/gh/unistack-org/micro)
 
 Micro is a standard library for microservices.
 

broker/broker.go

@@ -1,22 +1,24 @@
 // Package broker is an interface used for asynchronous messaging
-package broker // import "go.unistack.org/micro/v3/broker"
+package broker // import "go.unistack.org/micro/v4/broker"
 
 import (
 	"context"
 	"errors"
 
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/options"
 )
 
 // 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")
+	// ErrInvalidMessage returns when message has nvalid format
+	ErrInvalidMessage = errors.New("broker message has invalid format")
 )
 
 // Broker is an interface used for asynchronous messaging.
@@ -24,7 +26,7 @@ type Broker interface {
 	// Name returns broker instance name
 	Name() string
 	// Init initilize broker
-	Init(opts ...Option) error
+	Init(opts ...options.Option) error
 	// Options returns broker options
 	Options() Options
 	// Address return configured address
@@ -33,72 +35,29 @@ type Broker interface {
 	Connect(ctx context.Context) error
 	// Disconnect disconnect from broker
 	Disconnect(ctx context.Context) error
-	// Publish message to broker topic
-	Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error
+	// Publish message, msg can be single broker.Message or []broker.Message
+	Publish(ctx context.Context, msg interface{}, opts ...options.Option) error
 	// Subscribe subscribes to topic message via handler
-	Subscribe(ctx context.Context, topic string, h Handler, opts ...SubscribeOption) (Subscriber, error)
-	// BatchPublish messages to broker with multiple topics
-	BatchPublish(ctx context.Context, msgs []*Message, opts ...PublishOption) error
-	// BatchSubscribe subscribes to topic messages via handler
-	BatchSubscribe(ctx context.Context, topic string, h BatchHandler, opts ...SubscribeOption) (Subscriber, error)
+	Subscribe(ctx context.Context, topic string, handler interface{}, opts ...options.Option) (Subscriber, error)
 	// String type of broker
 	String() string
 }
 
-// Handler is used to process messages via a subscription of a topic.
-type Handler func(Event) error
-
-// Events contains multiple events
-type Events []Event
-
-// Ack try to ack all events and return
-func (evs Events) Ack() error {
-	var err error
-	for _, ev := range evs {
-		if err = ev.Ack(); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// SetError sets error on event
-func (evs Events) SetError(err error) {
-	for _, ev := range evs {
-		ev.SetError(err)
-	}
-}
-
-// BatchHandler is used to process messages in batches via a subscription of a topic.
-type BatchHandler func(Events) error
-
-// Event is given to a subscription handler for processing
-type Event interface {
-	// Topic returns event topic
+// Message is given to a subscription handler for processing
+type Message interface {
+	// Context for the message
+	Context() context.Context
+	// Topic
 	Topic() string
-	// Message returns broker message
-	Message() *Message
+	// Header returns message headers
+	Header() metadata.Metadata
+	// Body returns broker message may be []byte slice or some go struct
+	Body() interface{}
 	// Ack acknowledge message
 	Ack() error
 	// Error returns message error (like decoding errors or some other)
+	// In this case Body contains raw []byte from broker
 	Error() error
-	// SetError set event processing error
-	SetError(err error)
-}
-
-// Message is used to transfer data
-type Message struct {
-	// Header contains message metadata
-	Header metadata.Metadata
-	// Body contains message body
-	Body codec.RawMessage
-}
-
-// NewMessage create broker message with topic filled
-func NewMessage(topic string) *Message {
-	m := &Message{Header: metadata.New(2)}
-	m.Header.Set(metadata.HeaderTopic, topic)
-	return m
 }
 
 // Subscriber is a convenience return type for the Subscribe method
@@ -110,3 +69,9 @@ type Subscriber interface {
 	// Unsubscribe from topic
 	Unsubscribe(ctx context.Context) error
 }
+
+// MessageHandler func signature for single message processing
+type MessageHandler func(Message) error
+
+// MessagesHandler func signature for batch message processing
+type MessagesHandler func([]Message) error

broker/context.go

@@ -22,33 +22,3 @@ func NewContext(ctx context.Context, s Broker) context.Context {
 	}
 	return context.WithValue(ctx, brokerKey{}, s)
 }
-
-// SetSubscribeOption returns a function to setup a context with given value
-func SetSubscribeOption(k, v interface{}) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}
-
-// SetOption returns a function to setup a context with given value
-func SetOption(k, v interface{}) Option {
-	return func(o *Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}
-
-// SetPublishOption returns a function to setup a context with given value
-func SetPublishOption(k, v interface{}) PublishOption {
-	return func(o *PublishOptions) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}

broker/context_test.go

@@ -37,36 +37,3 @@ func TestNewNilContext(t *testing.T) {
 		t.Fatal("NewContext not works")
 	}
 }
-
-func TestSetSubscribeOption(t *testing.T) {
-	type key struct{}
-	o := SetSubscribeOption(key{}, "test")
-	opts := &SubscribeOptions{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetSubscribeOption not works")
-	}
-}
-
-func TestSetPublishOption(t *testing.T) {
-	type key struct{}
-	o := SetPublishOption(key{}, "test")
-	opts := &PublishOptions{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetPublishOption not works")
-	}
-}
-
-func TestSetOption(t *testing.T) {
-	type key struct{}
-	o := SetOption(key{}, "test")
-	opts := &Options{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetOption not works")
-	}
-}

broker/memory.go

@@ -2,17 +2,22 @@ package broker
 
 import (
 	"context"
+	"fmt"
 	"sync"
+	"time"
 
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/metadata"
-	maddr "go.unistack.org/micro/v3/util/addr"
-	"go.unistack.org/micro/v3/util/id"
-	mnet "go.unistack.org/micro/v3/util/net"
-	"go.unistack.org/micro/v3/util/rand"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/semconv"
+	maddr "go.unistack.org/micro/v4/util/addr"
+	"go.unistack.org/micro/v4/util/id"
+	mnet "go.unistack.org/micro/v4/util/net"
+	"go.unistack.org/micro/v4/util/rand"
 )
 
-type memoryBroker struct {
+type MemoryBroker struct {
 	subscribers map[string][]*memorySubscriber
 	addr        string
 	opts        Options
@@ -20,32 +25,15 @@ type memoryBroker struct {
 	connected bool
 }
 
-type memoryEvent struct {
-	err     error
-	message interface{}
-	topic   string
-	opts    Options
-}
-
-type memorySubscriber struct {
-	ctx          context.Context
-	exit         chan bool
-	handler      Handler
-	batchhandler BatchHandler
-	id           string
-	topic        string
-	opts         SubscribeOptions
-}
-
-func (m *memoryBroker) Options() Options {
+func (m *MemoryBroker) Options() Options {
 	return m.opts
 }
 
-func (m *memoryBroker) Address() string {
+func (m *MemoryBroker) Address() string {
 	return m.addr
 }
 
-func (m *memoryBroker) Connect(ctx context.Context) error {
+func (m *MemoryBroker) Connect(ctx context.Context) error {
 	m.Lock()
 	defer m.Unlock()
 
@@ -69,35 +57,33 @@ func (m *memoryBroker) Connect(ctx context.Context) error {
 	return nil
 }
 
-func (m *memoryBroker) Disconnect(ctx context.Context) error {
+func (m *MemoryBroker) Disconnect(ctx context.Context) error {
 	m.Lock()
 	defer m.Unlock()
 
-	if !m.connected {
-		return nil
-	}
-
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+		if m.connected {
 			m.connected = false
+		}
+	}
+
 	return nil
 }
 
-func (m *memoryBroker) Init(opts ...Option) error {
+func (m *MemoryBroker) Init(opts ...options.Option) error {
+	var err error
 	for _, o := range opts {
-		o(&m.opts)
+		if err = o(&m.opts); err != nil {
+			return err
+		}
 	}
 	return nil
 }
 
-func (m *memoryBroker) Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error {
-	msg.Header.Set(metadata.HeaderTopic, topic)
-	return m.publish(ctx, []*Message{msg}, opts...)
-}
-
-func (m *memoryBroker) BatchPublish(ctx context.Context, msgs []*Message, opts ...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, message interface{}, opts ...options.Option) error {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
@@ -112,17 +98,29 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 		return ctx.Err()
 	default:
 		options := NewPublishOptions(opts...)
-
-		msgTopicMap := make(map[string]Events)
-		for _, v := range msgs {
-			p := &memoryEvent{opts: m.opts}
-
-			if m.opts.Codec == nil || options.BodyOnly {
-				p.topic, _ = v.Header.Get(metadata.HeaderTopic)
-				p.message = v.Body
+		var msgs []Message
+		switch v := message.(type) {
+		case []Message:
+			msgs = v
+		case Message:
+			msgs = append(msgs, v)
+		default:
+			return ErrInvalidMessage
+		}
+		msgTopicMap := make(map[string][]*memoryMessage)
+		for _, msg := range msgs {
+			p := &memoryMessage{opts: options}
+			p.topic, _ = msg.Header().Get(metadata.HeaderTopic)
+			if v, ok := msg.Body().(*codec.Frame); ok {
+				p.body = msg.Body()
+			} else if len(m.opts.Codecs) == 0 {
+				p.body = msg.Body()
 			} else {
-				p.topic, _ = v.Header.Get(metadata.HeaderTopic)
-				p.message, err = m.opts.Codec.Marshal(v)
+				cf, ok := m.opts.Codecs[options.ContentType]
+				if !ok {
+					return fmt.Errorf("%s: %s", codec.ErrUnknownContentType, options.ContentType)
+				}
+				p.body, err = cf.Marshal(v)
 				if err != nil {
 					return err
 				}
@@ -130,110 +128,96 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 			msgTopicMap[p.topic] = append(msgTopicMap[p.topic], p)
 		}
 
-		beh := m.opts.BatchErrorHandler
 		eh := m.opts.ErrorHandler
 
 		for t, ms := range msgTopicMap {
+			ts := time.Now()
+
+			m.opts.Meter.Counter(semconv.PublishMessageInflight, "endpoint", t).Add(len(ms))
+			m.opts.Meter.Counter(semconv.SubscribeMessageInflight, "endpoint", t).Add(len(ms))
+
 			m.RLock()
 			subs, ok := m.subscribers[t]
 			m.RUnlock()
 			if !ok {
+				m.opts.Meter.Counter(semconv.PublishMessageTotal, "endpoint", t, "status", "failure").Add(len(ms))
+				m.opts.Meter.Counter(semconv.PublishMessageInflight, "endpoint", t).Add(-len(ms))
+				m.opts.Meter.Counter(semconv.SubscribeMessageInflight, "endpoint", t).Add(-len(ms))
 				continue
 			}
 
+			m.opts.Meter.Counter(semconv.PublishMessageTotal, "endpoint", t, "status", "success").Add(len(ms))
 			for _, sub := range subs {
-				if sub.opts.BatchErrorHandler != nil {
-					beh = sub.opts.BatchErrorHandler
-				}
 				if sub.opts.ErrorHandler != nil {
 					eh = sub.opts.ErrorHandler
 				}
 
-				switch {
-				// batch processing
-				case sub.batchhandler != nil:
-					if err = sub.batchhandler(ms); err != nil {
-						ms.SetError(err)
-						if beh != nil {
-							_ = beh(ms)
-						} else if m.opts.Logger.V(logger.ErrorLevel) {
-							m.opts.Logger.Error(m.opts.Context, err.Error())
+				switch mh := sub.handler.(type) {
+				case MessagesHandler:
+					mhs := make([]Message, 0, len(ms))
+					for _, m := range ms {
+						mhs = append(mhs, m)
 					}
-					} else if sub.opts.AutoAck {
-						if err = ms.Ack(); err != nil {
-							m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
-						}
-					}
-					// single processing
-				case sub.handler != nil:
-					for _, p := range ms {
-						if err = sub.handler(p); err != nil {
-							p.SetError(err)
+					if err = mh(mhs); err != nil {
+						m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Add(len(ms))
 						if eh != nil {
-								_ = eh(p)
+							switch meh := eh.(type) {
+							case MessagesHandler:
+								_ = meh(mhs)
+							case MessageHandler:
+								for _, me := range mhs {
+									_ = meh(me)
+								}
+							}
 						} else if m.opts.Logger.V(logger.ErrorLevel) {
 							m.opts.Logger.Error(m.opts.Context, err.Error())
 						}
-						} else if sub.opts.AutoAck {
+					}
+				case MessageHandler:
+					for _, p := range ms {
+						if err = mh(p); err != nil {
+							m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Inc()
+							if eh != nil {
+								switch meh := eh.(type) {
+								case MessageHandler:
+									_ = meh(p)
+								case MessagesHandler:
+									_ = meh([]Message{p})
+								}
+							} else if m.opts.Logger.V(logger.ErrorLevel) {
+								m.opts.Logger.Error(m.opts.Context, err.Error())
+							}
+						} else {
+							if sub.opts.AutoAck {
 								if err = p.Ack(); err != nil {
 									m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
+									m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Inc()
+								} else {
+									m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "success").Inc()
+								}
+							} else {
+								m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "success").Inc()
+							}
+						}
+						m.opts.Meter.Counter(semconv.PublishMessageInflight, "endpoint", t).Add(-1)
+						m.opts.Meter.Counter(semconv.SubscribeMessageInflight, "endpoint", t).Add(-1)
 					}
 				}
 			}
+
+			te := time.Since(ts)
+			m.opts.Meter.Summary(semconv.PublishMessageLatencyMicroseconds, "endpoint", t).Update(te.Seconds())
+			m.opts.Meter.Histogram(semconv.PublishMessageDurationSeconds, "endpoint", t).Update(te.Seconds())
+			m.opts.Meter.Summary(semconv.SubscribeMessageLatencyMicroseconds, "endpoint", t).Update(te.Seconds())
+			m.opts.Meter.Histogram(semconv.SubscribeMessageDurationSeconds, "endpoint", t).Update(te.Seconds())
 		}
-			}
-		}
+
 	}
 
 	return nil
 }
 
-func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler BatchHandler, opts ...SubscribeOption) (Subscriber, error) {
-	m.RLock()
-	if !m.connected {
-		m.RUnlock()
-		return nil, ErrNotConnected
-	}
-	m.RUnlock()
-
-	sid, err := id.New()
-	if err != nil {
-		return nil, err
-	}
-
-	options := NewSubscribeOptions(opts...)
-
-	sub := &memorySubscriber{
-		exit:         make(chan bool, 1),
-		id:           sid,
-		topic:        topic,
-		batchhandler: handler,
-		opts:         options,
-		ctx:          ctx,
-	}
-
-	m.Lock()
-	m.subscribers[topic] = append(m.subscribers[topic], sub)
-	m.Unlock()
-
-	go func() {
-		<-sub.exit
-		m.Lock()
-		newSubscribers := make([]*memorySubscriber, 0, len(m.subscribers)-1)
-		for _, sb := range m.subscribers[topic] {
-			if sb.id == sub.id {
-				continue
-			}
-			newSubscribers = append(newSubscribers, sb)
-		}
-		m.subscribers[topic] = newSubscribers
-		m.Unlock()
-	}()
-
-	return sub, nil
-}
-
-func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
+func (m *MemoryBroker) Subscribe(ctx context.Context, topic string, handler interface{}, opts ...options.Option) (Subscriber, error) {
 	m.RLock()
 	if !m.connected {
 		m.RUnlock()
@@ -278,46 +262,54 @@ func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Hand
 	return sub, nil
 }
 
-func (m *memoryBroker) String() string {
+func (m *MemoryBroker) String() string {
 	return "memory"
 }
 
-func (m *memoryBroker) Name() string {
+func (m *MemoryBroker) Name() string {
 	return m.opts.Name
 }
 
-func (m *memoryEvent) Topic() string {
+type memoryMessage struct {
+	err    error
+	body   interface{}
+	topic  string
+	header metadata.Metadata
+	opts   PublishOptions
+	ctx    context.Context
+}
+
+func (m *memoryMessage) Topic() string {
 	return m.topic
 }
 
-func (m *memoryEvent) Message() *Message {
-	switch v := m.message.(type) {
-	case *Message:
-		return v
-	case []byte:
-		msg := &Message{}
-		if err := m.opts.Codec.Unmarshal(v, msg); err != nil {
-			if m.opts.Logger.V(logger.ErrorLevel) {
-				m.opts.Logger.Error(m.opts.Context, "[memory]: failed to unmarshal: %v", err)
-			}
-			return nil
-		}
-		return msg
+func (m *memoryMessage) Header() metadata.Metadata {
+	return m.header
 }
 
+func (m *memoryMessage) Body() interface{} {
+	return m.body
+}
+
+func (m *memoryMessage) Ack() error {
 	return nil
 }
 
-func (m *memoryEvent) Ack() error {
-	return nil
-}
-
-func (m *memoryEvent) Error() error {
+func (m *memoryMessage) Error() error {
 	return m.err
 }
 
-func (m *memoryEvent) SetError(err error) {
-	m.err = err
+func (m *memoryMessage) Context() context.Context {
+	return m.ctx
+}
+
+type memorySubscriber struct {
+	ctx     context.Context
+	exit    chan bool
+	handler interface{}
+	id      string
+	topic   string
+	opts    SubscribeOptions
 }
 
 func (m *memorySubscriber) Options() SubscribeOptions {
@@ -334,8 +326,8 @@ func (m *memorySubscriber) Unsubscribe(ctx context.Context) error {
 }
 
 // NewBroker return new memory broker
-func NewBroker(opts ...Option) Broker {
-	return &memoryBroker{
+func NewBroker(opts ...options.Option) *MemoryBroker {
+	return &MemoryBroker{
 		opts:        NewOptions(opts...),
 		subscribers: make(map[string][]*memorySubscriber),
 	}

broker/memory_test.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"testing"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 func TestMemoryBatchBroker(t *testing.T) {
@@ -19,29 +19,35 @@ func TestMemoryBatchBroker(t *testing.T) {
 	topic := "test"
 	count := 10
 
-	fn := func(evts Events) error {
-		return evts.Ack()
+	fn := func(evts []Message) error {
+		var err error
+		for _, evt := range evts {
+			if err = evt.Ack(); err != nil {
+				return err
+			}
+		}
+		return nil
 	}
 
-	sub, err := b.BatchSubscribe(ctx, topic, fn)
+	sub, err := b.Subscribe(ctx, topic, fn)
 	if err != nil {
 		t.Fatalf("Unexpected error subscribing %v", err)
 	}
 
-	msgs := make([]*Message, 0, count)
+	msgs := make([]Message, 0, count)
 	for i := 0; i < count; i++ {
-		message := &Message{
-			Header: map[string]string{
+		message := &memoryMessage{
+			header: map[string]string{
 				metadata.HeaderTopic: topic,
 				"foo":                "bar",
 				"id":                 fmt.Sprintf("%d", i),
 			},
-			Body: []byte(`"hello world"`),
+			body: []byte(`"hello world"`),
 		}
 		msgs = append(msgs, message)
 	}
 
-	if err := b.BatchPublish(ctx, msgs); err != nil {
+	if err := b.Publish(ctx, msgs); err != nil {
 		t.Fatalf("Unexpected error publishing %v", err)
 	}
 
@@ -65,8 +71,8 @@ func TestMemoryBroker(t *testing.T) {
 	topic := "test"
 	count := 10
 
-	fn := func(p Event) error {
-		return nil
+	fn := func(p Message) error {
+		return p.Ack()
 	}
 
 	sub, err := b.Subscribe(ctx, topic, fn)
@@ -74,24 +80,20 @@ func TestMemoryBroker(t *testing.T) {
 		t.Fatalf("Unexpected error subscribing %v", err)
 	}
 
-	msgs := make([]*Message, 0, count)
+	msgs := make([]Message, 0, count)
 	for i := 0; i < count; i++ {
-		message := &Message{
-			Header: map[string]string{
+		message := &memoryMessage{
+			header: map[string]string{
 				metadata.HeaderTopic: topic,
 				"foo":                "bar",
 				"id":                 fmt.Sprintf("%d", i),
 			},
-			Body: []byte(`"hello world"`),
+			body: []byte(`"hello world"`),
 		}
 		msgs = append(msgs, message)
-
-		if err := b.Publish(ctx, topic, message); err != nil {
-			t.Fatalf("Unexpected error publishing %d err: %v", i, err)
-		}
 	}
 
-	if err := b.BatchPublish(ctx, msgs); err != nil {
+	if err := b.Publish(ctx, msgs); err != nil {
 		t.Fatalf("Unexpected error publishing %v", err)
 	}
 

broker/options.go

@@ -5,11 +5,13 @@ import (
 	"crypto/tls"
 	"time"
 
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/register"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options struct
@@ -18,8 +20,8 @@ type Options struct {
 	Tracer tracer.Tracer
 	// Register can be used for clustering
 	Register register.Register
-	// Codec holds the codec for marshal/unmarshal
-	Codec codec.Codec
+	// Codecs holds the codec for marshal/unmarshal
+	Codecs map[string]codec.Codec
 	// Logger used for logging
 	Logger logger.Logger
 	// Meter used for metrics
@@ -28,24 +30,22 @@ type Options struct {
 	Context context.Context
 	// TLSConfig holds tls.TLSConfig options
 	TLSConfig *tls.Config
-	// ErrorHandler used when broker can't unmarshal incoming message
-	ErrorHandler Handler
-	// BatchErrorHandler used when broker can't unmashal incoming messages
-	BatchErrorHandler BatchHandler
+	// ErrorHandler used when broker have error while processing message
+	ErrorHandler interface{}
 	// Name holds the broker name
 	Name string
-	// Addrs holds the broker address
-	Addrs []string
+	// Address holds the broker address
+	Address []string
 }
 
 // NewOptions create new Options
-func NewOptions(opts ...Option) Options {
+func NewOptions(opts ...options.Option) Options {
 	options := Options{
 		Register: register.DefaultRegister,
 		Logger:   logger.DefaultLogger,
 		Context:  context.Background(),
 		Meter:    meter.DefaultMeter,
-		Codec:    codec.DefaultCodec,
+		Codecs:   make(map[string]codec.Codec),
 		Tracer:   tracer.DefaultTracer,
 	}
 	for _, o := range opts {
@@ -54,23 +54,22 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
-// Context sets the context option
-func Context(ctx context.Context) Option {
-	return func(o *Options) {
-		o.Context = ctx
-	}
-}
-
 // PublishOptions struct
 type PublishOptions struct {
 	// Context holds external options
 	Context context.Context
 	// BodyOnly flag says the message contains raw body bytes
 	BodyOnly bool
+	// Message metadata usually passed as message headers
+	Metadata metadata.Metadata
+	// Content-Type of message for marshal
+	ContentType string
+	// Topic destination
+	Topic string
 }
 
 // NewPublishOptions creates PublishOptions struct
-func NewPublishOptions(opts ...PublishOption) PublishOptions {
+func NewPublishOptions(opts ...options.Option) PublishOptions {
 	options := PublishOptions{
 		Context: context.Background(),
 	}
@@ -80,16 +79,21 @@ func NewPublishOptions(opts ...PublishOption) PublishOptions {
 	return options
 }
 
+// PublishTopic pass topic for messages
+func PublishTopic(t string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, t, ".Topic")
+	}
+}
+
 // SubscribeOptions struct
 type SubscribeOptions struct {
 	// Context holds external options
 	Context context.Context
-	// ErrorHandler used when broker can't unmarshal incoming message
-	ErrorHandler Handler
-	// BatchErrorHandler used when broker can't unmashal incoming messages
-	BatchErrorHandler BatchHandler
-	// Group holds consumer group
-	Group string
+	// ErrorHandler used when broker have error while processing message
+	ErrorHandler interface{}
+	// QueueGroup holds consumer group
+	QueueGroup string
 	// AutoAck flag specifies auto ack of incoming message when no error happens
 	AutoAck bool
 	// BodyOnly flag specifies that message contains only body bytes without header
@@ -100,179 +104,16 @@ type SubscribeOptions struct {
 	BatchWait time.Duration
 }
 
-// Option func
-type Option func(*Options)
-
-// PublishOption func
-type PublishOption func(*PublishOptions)
-
-// PublishBodyOnly publish only body of the message
-func PublishBodyOnly(b bool) PublishOption {
-	return func(o *PublishOptions) {
-		o.BodyOnly = b
-	}
-}
-
-// PublishContext sets the context
-func PublishContext(ctx context.Context) PublishOption {
-	return func(o *PublishOptions) {
-		o.Context = ctx
-	}
-}
-
-// Addrs sets the host addresses to be used by the broker
-func Addrs(addrs ...string) Option {
-	return func(o *Options) {
-		o.Addrs = addrs
-	}
-}
-
-// Codec sets the codec used for encoding/decoding used where
-// a broker does not support headers
-func Codec(c codec.Codec) Option {
-	return func(o *Options) {
-		o.Codec = c
-	}
-}
-
 // ErrorHandler will catch all broker errors that cant be handled
 // in normal way, for example Codec errors
-func ErrorHandler(h Handler) Option {
-	return func(o *Options) {
-		o.ErrorHandler = h
+func ErrorHandler(h interface{}) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, h, ".ErrorHandler")
 	}
 }
 
-// BatchErrorHandler will catch all broker errors that cant be handled
-// in normal way, for example Codec errors
-func BatchErrorHandler(h BatchHandler) Option {
-	return func(o *Options) {
-		o.BatchErrorHandler = h
-	}
-}
-
-// SubscribeErrorHandler will catch all broker errors that cant be handled
-// in normal way, for example Codec errors
-func SubscribeErrorHandler(h Handler) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.ErrorHandler = h
-	}
-}
-
-// SubscribeBatchErrorHandler will catch all broker errors that cant be handled
-// in normal way, for example Codec errors
-func SubscribeBatchErrorHandler(h BatchHandler) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.BatchErrorHandler = h
-	}
-}
-
-// Queue sets the subscribers queue
-// Deprecated
-func Queue(name string) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.Group = name
-	}
-}
-
-// SubscribeGroup sets the name of the queue to share messages on
-func SubscribeGroup(name string) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.Group = name
-	}
-}
-
-// Register sets register option
-func Register(r register.Register) Option {
-	return func(o *Options) {
-		o.Register = r
-	}
-}
-
-// TLSConfig sets the TLS Config
-func TLSConfig(t *tls.Config) Option {
-	return func(o *Options) {
-		o.TLSConfig = t
-	}
-}
-
-// Logger sets the logger
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
-// Tracer to be used for tracing
-func Tracer(t tracer.Tracer) Option {
-	return func(o *Options) {
-		o.Tracer = t
-	}
-}
-
-// Meter sets the meter
-func Meter(m meter.Meter) Option {
-	return func(o *Options) {
-		o.Meter = m
-	}
-}
-
-// Name sets the name
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
-	}
-}
-
-// SubscribeContext set context
-func SubscribeContext(ctx context.Context) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.Context = ctx
-	}
-}
-
-// DisableAutoAck disables auto ack
-// Deprecated
-func DisableAutoAck() SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.AutoAck = false
-	}
-}
-
-// SubscribeAutoAck contol auto acking of messages
-// after they have been handled.
-func SubscribeAutoAck(b bool) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.AutoAck = b
-	}
-}
-
-// SubscribeBodyOnly consumes only body of the message
-func SubscribeBodyOnly(b bool) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.BodyOnly = b
-	}
-}
-
-// SubscribeBatchSize specifies max batch size
-func SubscribeBatchSize(n int) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.BatchSize = n
-	}
-}
-
-// SubscribeBatchWait specifies max batch wait time
-func SubscribeBatchWait(td time.Duration) SubscribeOption {
-	return func(o *SubscribeOptions) {
-		o.BatchWait = td
-	}
-}
-
-// SubscribeOption func
-type SubscribeOption func(*SubscribeOptions)
-
 // NewSubscribeOptions creates new SubscribeOptions
-func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
+func NewSubscribeOptions(opts ...options.Option) SubscribeOptions {
 	options := SubscribeOptions{
 		AutoAck: true,
 		Context: context.Background(),
@@ -282,3 +123,39 @@ func NewSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
 	}
 	return options
 }
+
+// SubscribeAutoAck contol auto acking of messages
+// after they have been handled.
+func SubscribeAutoAck(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".AutoAck")
+	}
+}
+
+// BodyOnly transfer only body without
+func BodyOnly(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".BodyOnly")
+	}
+}
+
+// SubscribeBatchSize specifies max batch size
+func SubscribeBatchSize(n int) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, n, ".BatchSize")
+	}
+}
+
+// SubscribeBatchWait specifies max batch wait time
+func SubscribeBatchWait(td time.Duration) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, td, ".BatchWait")
+	}
+}
+
+// SubscribeQueueGroup sets the shared queue name distributed messages across subscribers
+func SubscribeQueueGroup(n string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, n, ".QueueGroup")
+	}
+}

broker/subscriber.go

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

client/backoff.go

@@ -5,7 +5,7 @@ import (
 	"math"
 	"time"
 
-	"go.unistack.org/micro/v3/util/backoff"
+	"go.unistack.org/micro/v4/util/backoff"
 )
 
 // BackoffFunc is the backoff call func

client/client.go

@@ -1,12 +1,12 @@
 // Package client is an interface for an RPC client
-package client // import "go.unistack.org/micro/v3/client"
+package client // import "go.unistack.org/micro/v4/client"
 
 import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/options"
 )
 
 var (
@@ -22,6 +22,8 @@ var (
 	DefaultRetries = 0
 	// DefaultRequestTimeout is the default request timeout
 	DefaultRequestTimeout = time.Second * 5
+	// DefaultDialTimeout the default dial timeout
+	DefaultDialTimeout = time.Second * 5
 	// DefaultPoolSize sets the connection pool size
 	DefaultPoolSize = 100
 	// DefaultPoolTTL sets the connection pool ttl
@@ -33,25 +35,14 @@ var (
 // It also supports bidirectional streaming of requests.
 type Client interface {
 	Name() string
-	Init(opts ...Option) error
+	Init(opts ...options.Option) error
 	Options() Options
-	NewMessage(topic string, msg interface{}, opts ...MessageOption) Message
-	NewRequest(service string, endpoint string, req interface{}, opts ...RequestOption) Request
-	Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
-	Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error)
-	Publish(ctx context.Context, msg Message, opts ...PublishOption) error
-	BatchPublish(ctx context.Context, msg []Message, opts ...PublishOption) error
+	NewRequest(service string, endpoint string, req interface{}, opts ...options.Option) Request
+	Call(ctx context.Context, req Request, rsp interface{}, opts ...options.Option) error
+	Stream(ctx context.Context, req Request, opts ...options.Option) (Stream, error)
 	String() string
 }
 
-// Message is the interface for publishing asynchronously
-type Message interface {
-	Topic() string
-	Payload() interface{}
-	ContentType() string
-	Metadata() metadata.Metadata
-}
-
 // Request is the interface for a synchronous request used by Call or Stream
 type Request interface {
 	// The service to call
@@ -68,16 +59,22 @@ type Request interface {
 	Codec() codec.Codec
 	// indicates whether the request will be a streaming one rather than unary
 	Stream() bool
+	// Header data
+	// Header() metadata.Metadata
 }
 
 // Response is the response received from a service
 type Response interface {
 	// Read the response
 	Codec() codec.Codec
+	// The content type
+	// ContentType() string
 	// Header data
-	Header() metadata.Metadata
+	// Header() metadata.Metadata
 	// Read the undecoded response
 	Read() ([]byte, error)
+	// The unencoded request body
+	// Body() interface{}
 }
 
 // Stream is the interface for a bidirectional synchronous stream
@@ -103,18 +100,3 @@ type Stream interface {
 	// CloseSend closes the send direction of the stream
 	CloseSend() error
 }
-
-// Option used by the Client
-type Option func(*Options)
-
-// CallOption used by Call or Stream
-type CallOption func(*CallOptions)
-
-// PublishOption used by Publish
-type PublishOption func(*PublishOptions)
-
-// MessageOption used by NewMessage
-type MessageOption func(*MessageOptions)
-
-// RequestOption used by NewRequest
-type RequestOption func(*RequestOptions)

client/client_call_options.go

@@ -2,22 +2,24 @@ package client
 
 import (
 	"context"
+
+	"go.unistack.org/micro/v4/options"
 )
 
 type clientCallOptions struct {
 	Client
-	opts []CallOption
+	opts []options.Option
 }
 
-func (s *clientCallOptions) Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
+func (s *clientCallOptions) Call(ctx context.Context, req Request, rsp interface{}, opts ...options.Option) error {
 	return s.Client.Call(ctx, req, rsp, append(s.opts, opts...)...)
 }
 
-func (s *clientCallOptions) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
+func (s *clientCallOptions) Stream(ctx context.Context, req Request, opts ...options.Option) (Stream, error) {
 	return s.Client.Stream(ctx, req, append(s.opts, opts...)...)
 }
 
 // NewClientCallOptions add CallOption to every call
-func NewClientCallOptions(c Client, opts ...CallOption) Client {
+func NewClientCallOptions(c Client, opts ...options.Option) Client {
 	return &clientCallOptions{c, opts}
 }

client/client_call_options_test.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"testing"
 	"time"
+
+	"go.unistack.org/micro/v4/options"
 )
 
 func TestNewClientCallOptions(t *testing.T) {
@@ -13,11 +15,11 @@ func TestNewClientCallOptions(t *testing.T) {
 		return fn
 	}
 	c := NewClientCallOptions(NewClient(),
-		WithAddress("127.0.0.1"),
+		options.Address("127.0.0.1"),
 		WithCallWrapper(w),
-		WithRequestTimeout(1*time.Millisecond),
-		WithRetries(0),
-		WithBackoff(BackoffInterval(10*time.Millisecond, 100*time.Millisecond)),
+		RequestTimeout(1*time.Millisecond),
+		Retries(0),
+		Backoff(BackoffInterval(10*time.Millisecond, 100*time.Millisecond)),
 	)
 	_ = c.Call(context.TODO(), c.NewRequest("service", "endpoint", nil), nil)
 	if !flag {

client/context.go

@@ -22,33 +22,3 @@ func NewContext(ctx context.Context, c Client) context.Context {
 	}
 	return context.WithValue(ctx, clientKey{}, c)
 }
-
-// SetPublishOption returns a function to setup a context with given value
-func SetPublishOption(k, v interface{}) PublishOption {
-	return func(o *PublishOptions) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}
-
-// SetCallOption returns a function to setup a context with given value
-func SetCallOption(k, v interface{}) CallOption {
-	return func(o *CallOptions) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}
-
-// SetOption returns a function to setup a context with given value
-func SetOption(k, v interface{}) Option {
-	return func(o *Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}

client/context_test.go

@@ -38,36 +38,3 @@ func TestNewNilContext(t *testing.T) {
 		t.Fatal("NewContext not works")
 	}
 }
-
-func TestSetPublishOption(t *testing.T) {
-	type key struct{}
-	o := SetPublishOption(key{}, "test")
-	opts := &PublishOptions{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetPublishOption not works")
-	}
-}
-
-func TestSetCallOption(t *testing.T) {
-	type key struct{}
-	o := SetCallOption(key{}, "test")
-	opts := &CallOptions{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetCallOption not works")
-	}
-}
-
-func TestSetOption(t *testing.T) {
-	type key struct{}
-	o := SetOption(key{}, "test")
-	opts := &Options{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetOption not works")
-	}
-}

client/lookup.go

@@ -4,8 +4,8 @@ import (
 	"context"
 	"sort"
 
-	"go.unistack.org/micro/v3/errors"
-	"go.unistack.org/micro/v3/router"
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/router"
 )
 
 // LookupFunc is used to lookup routes for a service

client/noop.go

@@ -5,11 +5,12 @@ import (
 	"fmt"
 	"time"
 
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/errors"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/selector"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/selector"
+	"go.unistack.org/micro/v4/semconv"
 )
 
 // DefaultCodecs will be used to encode/decode data
@@ -21,12 +22,6 @@ type noopClient struct {
 	opts Options
 }
 
-type noopMessage struct {
-	topic   string
-	payload interface{}
-	opts    MessageOptions
-}
-
 type noopRequest struct {
 	body        interface{}
 	codec       codec.Codec
@@ -38,16 +33,12 @@ type noopRequest struct {
 }
 
 // NewClient returns new noop client
-func NewClient(opts ...Option) Client {
+func NewClient(opts ...options.Option) Client {
 	nc := &noopClient{opts: NewOptions(opts...)}
 	// wrap in reverse
 
 	c := Client(nc)
 
-	for i := len(nc.opts.Wrappers); i > 0; i-- {
-		c = nc.opts.Wrappers[i-1](c)
-	}
-
 	return c
 }
 
@@ -142,22 +133,6 @@ func (n *noopStream) CloseSend() error {
 	return nil
 }
 
-func (n *noopMessage) Topic() string {
-	return n.topic
-}
-
-func (n *noopMessage) Payload() interface{} {
-	return n.payload
-}
-
-func (n *noopMessage) ContentType() string {
-	return n.opts.ContentType
-}
-
-func (n *noopMessage) Metadata() metadata.Metadata {
-	return n.opts.Metadata
-}
-
 func (n *noopClient) newCodec(contentType string) (codec.Codec, error) {
 	if cf, ok := n.opts.Codecs[contentType]; ok {
 		return cf, nil
@@ -168,7 +143,7 @@ func (n *noopClient) newCodec(contentType string) (codec.Codec, error) {
 	return nil, codec.ErrUnknownContentType
 }
 
-func (n *noopClient) Init(opts ...Option) error {
+func (n *noopClient) Init(opts ...options.Option) error {
 	for _, o := range opts {
 		o(&n.opts)
 	}
@@ -183,7 +158,7 @@ func (n *noopClient) String() string {
 	return "noop"
 }
 
-func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
+func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opts ...options.Option) error {
 	// make a copy of call opts
 	callOpts := n.opts.CallOptions
 	for _, opt := range opts {
@@ -200,7 +175,7 @@ func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opt
 	} else {
 		// got a deadline so no need to setup context
 		// but we need to set the timeout we pass along
-		opt := WithRequestTimeout(time.Until(d))
+		opt := RequestTimeout(time.Until(d))
 		opt(&callOpts)
 	}
 
@@ -285,6 +260,9 @@ func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opt
 	ch := make(chan error, callOpts.Retries)
 	var gerr error
 
+	ts := time.Now()
+	endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", endpoint).Inc()
 	for i := 0; i <= callOpts.Retries; i++ {
 		go func() {
 			ch <- call(i)
@@ -312,6 +290,16 @@ func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opt
 		}
 	}
 
+	if gerr != nil {
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "failure").Inc()
+	} else {
+		n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "success").Inc()
+	}
+	n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", endpoint).Dec()
+	te := time.Since(ts)
+	n.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", endpoint).Update(te.Seconds())
+	n.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", endpoint).Update(te.Seconds())
+
 	return gerr
 }
 
@@ -319,16 +307,11 @@ func (n *noopClient) call(ctx context.Context, addr string, req Request, rsp int
 	return nil
 }
 
-func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts ...RequestOption) Request {
+func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts ...options.Option) Request {
 	return &noopRequest{service: service, endpoint: endpoint}
 }
 
-func (n *noopClient) NewMessage(topic string, msg interface{}, opts ...MessageOption) Message {
-	options := NewMessageOptions(append([]MessageOption{MessageContentType(n.opts.ContentType)}, opts...)...)
-	return &noopMessage{topic: topic, payload: msg, opts: options}
-}
-
-func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
+func (n *noopClient) Stream(ctx context.Context, req Request, opts ...options.Option) (Stream, error) {
 	var err error
 
 	// make a copy of call opts
@@ -347,7 +330,7 @@ func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption
 	} else {
 		// got a deadline so no need to setup context
 		// but we need to set the timeout we pass along
-		o := WithStreamTimeout(time.Until(d))
+		o := StreamTimeout(time.Until(d))
 		o(&callOpts)
 	}
 
@@ -414,7 +397,15 @@ func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption
 
 		node := next()
 
+		// ts := time.Now()
+		endpoint := fmt.Sprintf("%s.%s", req.Service(), req.Endpoint())
+		n.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", endpoint).Inc()
 		stream, cerr := n.stream(ctx, node, req, callOpts)
+		if cerr != nil {
+			n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "failure").Inc()
+		} else {
+			n.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", endpoint, "status", "success").Inc()
+		}
 
 		// record the result of the call to inform future routing decisions
 		if verr := n.opts.Selector.Record(node, cerr); verr != nil {
@@ -468,64 +459,6 @@ func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption
 	return nil, grr
 }
 
-func (n *noopClient) stream(ctx context.Context, addr string, req Request, opts CallOptions) (Stream, error) {
+func (n *noopClient) stream(ctx context.Context, addr string, req Request, opts CallOptions) (*noopStream, error) {
 	return &noopStream{}, nil
 }
-
-func (n *noopClient) BatchPublish(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.publish(ctx, []Message{p}, opts...)
-}
-
-func (n *noopClient) publish(ctx context.Context, ps []Message, opts ...PublishOption) error {
-	options := NewPublishOptions(opts...)
-
-	msgs := make([]*broker.Message, 0, len(ps))
-
-	for _, p := range ps {
-		md, ok := metadata.FromOutgoingContext(ctx)
-		if !ok {
-			md = metadata.New(0)
-		}
-		md[metadata.HeaderContentType] = p.ContentType()
-
-		topic := p.Topic()
-
-		// get the exchange
-		if len(options.Exchange) > 0 {
-			topic = options.Exchange
-		}
-
-		md[metadata.HeaderTopic] = topic
-
-		var body []byte
-
-		// passed in raw data
-		if d, ok := p.Payload().(*codec.Frame); ok {
-			body = d.Data
-		} else {
-			// use codec for payload
-			cf, err := n.newCodec(p.ContentType())
-			if err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-
-			// set the body
-			b, err := cf.Marshal(p.Payload())
-			if err != nil {
-				return errors.InternalServerError("go.micro.client", err.Error())
-			}
-			body = b
-		}
-
-		msgs = append(msgs, &broker.Message{Header: md, Body: body})
-	}
-
-	return n.opts.Broker.BatchPublish(ctx, msgs,
-		broker.PublishContext(options.Context),
-		broker.PublishBodyOnly(options.BodyOnly),
-	)
-}

client/options.go

@@ -6,31 +6,25 @@ import (
 	"net"
 	"time"
 
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/network/transport"
-	"go.unistack.org/micro/v3/register"
-	"go.unistack.org/micro/v3/router"
-	"go.unistack.org/micro/v3/selector"
-	"go.unistack.org/micro/v3/selector/random"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/router"
+	"go.unistack.org/micro/v4/selector"
+	"go.unistack.org/micro/v4/selector/random"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options holds client options
 type Options struct {
-	// Transport used for transfer messages
-	Transport transport.Transport
 	// Selector used to select needed address
 	Selector selector.Selector
 	// Logger used to log messages
 	Logger logger.Logger
 	// Tracer used for tracing
 	Tracer tracer.Tracer
-	// Broker used to publish messages
-	Broker broker.Broker
 	// Meter used for metrics
 	Meter meter.Meter
 	// Context is used for external options
@@ -49,8 +43,6 @@ type Options struct {
 	ContentType string
 	// Name is the client name
 	Name string
-	// Wrappers contains wrappers
-	Wrappers []Wrapper
 	// CallOptions contains default CallOptions
 	CallOptions CallOptions
 	// PoolSize connection pool size
@@ -59,10 +51,12 @@ type Options struct {
 	PoolTTL time.Duration
 	// ContextDialer used to connect
 	ContextDialer func(context.Context, string) (net.Conn, error)
+	// Hooks may contains Client func wrapper
+	Hooks options.Hooks
 }
 
 // NewCallOptions creates new call options struct
-func NewCallOptions(opts ...CallOption) CallOptions {
+func NewCallOptions(opts ...options.Option) CallOptions {
 	options := CallOptions{}
 	for _, o := range opts {
 		o(&options)
@@ -111,58 +105,14 @@ type CallOptions struct {
 }
 
 // ContextDialer pass ContextDialer to client
-func ContextDialer(fn func(context.Context, string) (net.Conn, error)) Option {
-	return func(o *Options) {
-		o.ContextDialer = fn
+func ContextDialer(fn func(context.Context, string) (net.Conn, error)) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".ContextDialer")
 	}
 }
 
-// Context pass context to client
-func Context(ctx context.Context) Option {
-	return func(o *Options) {
-		o.Context = ctx
-	}
-}
-
-// NewPublishOptions create new PublishOptions struct from option
-func NewPublishOptions(opts ...PublishOption) PublishOptions {
-	options := PublishOptions{}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-// PublishOptions holds publish options
-type PublishOptions struct {
-	// Context used for external options
-	Context context.Context
-	// Exchange topic exchange name
-	Exchange string
-	// BodyOnly will publish only message body
-	BodyOnly bool
-}
-
-// NewMessageOptions creates message options struct
-func NewMessageOptions(opts ...MessageOption) MessageOptions {
-	options := MessageOptions{Metadata: metadata.New(1)}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-// MessageOptions holds client message options
-type MessageOptions struct {
-	// Metadata additional metadata
-	Metadata metadata.Metadata
-	// ContentType specify content-type of message
-	// deprecated
-	ContentType string
-}
-
 // NewRequestOptions creates new RequestOptions struct
-func NewRequestOptions(opts ...RequestOption) RequestOptions {
+func NewRequestOptions(opts ...options.Option) RequestOptions {
 	options := RequestOptions{}
 	for _, o := range opts {
 		o(&options)
@@ -181,7 +131,7 @@ type RequestOptions struct {
 }
 
 // NewOptions creates new options struct
-func NewOptions(opts ...Option) Options {
+func NewOptions(opts ...options.Option) Options {
 	options := Options{
 		Context:     context.Background(),
 		ContentType: DefaultContentType,
@@ -192,18 +142,16 @@ func NewOptions(opts ...Option) Options {
 			Retry:          DefaultRetry,
 			Retries:        DefaultRetries,
 			RequestTimeout: DefaultRequestTimeout,
-			DialTimeout:    transport.DefaultDialTimeout,
+			DialTimeout:    DefaultDialTimeout,
 		},
 		Lookup:   LookupRoute,
 		PoolSize: DefaultPoolSize,
 		PoolTTL:  DefaultPoolTTL,
 		Selector: random.NewSelector(),
 		Logger:   logger.DefaultLogger,
-		Broker:    broker.DefaultBroker,
 		Meter:    meter.DefaultMeter,
 		Tracer:   tracer.DefaultTracer,
 		Router:   router.DefaultRouter,
-		Transport: transport.DefaultTransport,
 	}
 
 	for _, o := range opts {
@@ -213,381 +161,131 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
-// Broker to be used for pub/sub
-func Broker(b broker.Broker) Option {
-	return func(o *Options) {
-		o.Broker = b
-	}
-}
-
-// Tracer to be used for tracing
-func Tracer(t tracer.Tracer) Option {
-	return func(o *Options) {
-		o.Tracer = t
-	}
-}
-
-// Logger to be used for log mesages
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
-// Meter to be used for metrics
-func Meter(m meter.Meter) Option {
-	return func(o *Options) {
-		o.Meter = m
-	}
-}
-
-// Codec to be used to encode/decode requests for a given content type
-func Codec(contentType string, c codec.Codec) Option {
-	return func(o *Options) {
-		o.Codecs[contentType] = c
-	}
-}
-
-// ContentType used by default if not specified
-func ContentType(ct string) Option {
-	return func(o *Options) {
-		o.ContentType = ct
-	}
-}
-
 // Proxy sets the proxy address
-func Proxy(addr string) Option {
-	return func(o *Options) {
-		o.Proxy = addr
+func Proxy(addr string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, addr, ".Proxy")
 	}
 }
 
 // PoolSize sets the connection pool size
-func PoolSize(d int) Option {
-	return func(o *Options) {
-		o.PoolSize = d
+func PoolSize(d int) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, d, ".PoolSize")
 	}
 }
 
 // PoolTTL sets the connection pool ttl
-func PoolTTL(d time.Duration) Option {
-	return func(o *Options) {
-		o.PoolTTL = d
-	}
-}
-
-// Transport to use for communication e.g http, rabbitmq, etc
-func Transport(t transport.Transport) Option {
-	return func(o *Options) {
-		o.Transport = t
-	}
-}
-
-// Register sets the routers register
-func Register(r register.Register) Option {
-	return func(o *Options) {
-		if o.Router != nil {
-			_ = o.Router.Init(router.Register(r))
-		}
-	}
-}
-
-// Router is used to lookup routes for a service
-func Router(r router.Router) Option {
-	return func(o *Options) {
-		o.Router = r
+func PoolTTL(td time.Duration) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, td, ".PoolTTL")
 	}
 }
 
 // Selector is used to select a route
-func Selector(s selector.Selector) Option {
-	return func(o *Options) {
-		o.Selector = s
-	}
-}
-
-// 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...)
+func Selector(s selector.Selector) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, s, ".Selector")
 	}
 }
 
 // Backoff is used to set the backoff function used when retrying Calls
-func Backoff(fn BackoffFunc) Option {
-	return func(o *Options) {
-		o.CallOptions.Backoff = fn
-	}
-}
-
-// Name sets the client name
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
+func Backoff(fn BackoffFunc) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".Backoff")
 	}
 }
 
 // Lookup sets the lookup function to use for resolving service names
-func Lookup(l LookupFunc) Option {
-	return func(o *Options) {
-		o.Lookup = l
+func Lookup(fn LookupFunc) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".Lookup")
 	}
 }
 
-// TLSConfig specifies a *tls.Config
-func TLSConfig(t *tls.Config) Option {
-	return func(o *Options) {
-		// set the internal tls
-		o.TLSConfig = t
-
-		// set the default transport if one is not
-		// already set. Required for Init call below.
-
-		// set the transport tls
-		_ = o.Transport.Init(
-			transport.TLSConfig(t),
-		)
+// WithCallWrapper sets the retry function to be used when re-trying.
+func WithCallWrapper(fn CallWrapper) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".CallWrappers")
 	}
 }
 
 // Retries sets the retry count when making the request.
-func Retries(i int) Option {
-	return func(o *Options) {
-		o.CallOptions.Retries = i
+func Retries(n int) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, n, ".Retries")
 	}
 }
 
 // Retry sets the retry function to be used when re-trying.
-func Retry(fn RetryFunc) Option {
-	return func(o *Options) {
-		o.CallOptions.Retry = fn
+func Retry(fn RetryFunc) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".Retry")
 	}
 }
 
 // RequestTimeout is the request timeout.
-func RequestTimeout(d time.Duration) Option {
-	return func(o *Options) {
-		o.CallOptions.RequestTimeout = d
+func RequestTimeout(td time.Duration) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, td, ".RequestTimeout")
 	}
 }
 
 // StreamTimeout sets the stream timeout
-func StreamTimeout(d time.Duration) Option {
-	return func(o *Options) {
-		o.CallOptions.StreamTimeout = d
+func StreamTimeout(td time.Duration) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, td, ".StreamTimeout")
 	}
 }
 
 // DialTimeout sets the dial timeout
-func DialTimeout(d time.Duration) Option {
-	return func(o *Options) {
-		o.CallOptions.DialTimeout = d
-	}
-}
-
-// WithExchange sets the exchange to route a message through
-// Deprecated
-func WithExchange(e string) PublishOption {
-	return func(o *PublishOptions) {
-		o.Exchange = e
-	}
-}
-
-// PublishExchange sets the exchange to route a message through
-func PublishExchange(e string) PublishOption {
-	return func(o *PublishOptions) {
-		o.Exchange = e
-	}
-}
-
-// WithBodyOnly publish only message body
-// DERECATED
-func WithBodyOnly(b bool) PublishOption {
-	return func(o *PublishOptions) {
-		o.BodyOnly = b
-	}
-}
-
-// PublishBodyOnly publish only message body
-func PublishBodyOnly(b bool) PublishOption {
-	return func(o *PublishOptions) {
-		o.BodyOnly = b
-	}
-}
-
-// PublishContext sets the context in publish options
-func PublishContext(ctx context.Context) PublishOption {
-	return func(o *PublishOptions) {
-		o.Context = ctx
-	}
-}
-
-// WithContextDialer pass ContextDialer to client call
-func WithContextDialer(fn func(context.Context, string) (net.Conn, error)) CallOption {
-	return func(o *CallOptions) {
-		o.ContextDialer = fn
-	}
-}
-
-// WithContentType specifies call content type
-func WithContentType(ct string) CallOption {
-	return func(o *CallOptions) {
-		o.ContentType = ct
-	}
-}
-
-// WithAddress sets the remote addresses to use rather than using service discovery
-func WithAddress(a ...string) CallOption {
-	return func(o *CallOptions) {
-		o.Address = a
-	}
-}
-
-// 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 {
-	return func(o *CallOptions) {
-		o.Backoff = fn
-	}
-}
-
-// WithRetry is a CallOption which overrides that which
-// set in Options.CallOptions
-func WithRetry(fn RetryFunc) CallOption {
-	return func(o *CallOptions) {
-		o.Retry = fn
-	}
-}
-
-// WithRetries is a CallOption which overrides that which
-// set in Options.CallOptions
-func WithRetries(i int) CallOption {
-	return func(o *CallOptions) {
-		o.Retries = i
+func DialTimeout(td time.Duration) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, td, ".DialTimeout")
 	}
 }
 
 // WithResponseMetadata is a CallOption which adds metadata.Metadata to Options.CallOptions
-func WithResponseMetadata(md *metadata.Metadata) CallOption {
-	return func(o *CallOptions) {
-		o.ResponseMetadata = md
+func ResponseMetadata(md *metadata.Metadata) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, md, ".ResponseMetadata")
 	}
 }
 
 // WithRequestMetadata is a CallOption which adds metadata.Metadata to Options.CallOptions
-func WithRequestMetadata(md metadata.Metadata) CallOption {
-	return func(o *CallOptions) {
-		o.RequestMetadata = md
+func RequestMetadata(md metadata.Metadata) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, metadata.Copy(md), ".RequestMetadata")
 	}
 }
 
-// WithRequestTimeout is a CallOption which overrides that which
-// set in Options.CallOptions
-func WithRequestTimeout(d time.Duration) CallOption {
-	return func(o *CallOptions) {
-		o.RequestTimeout = d
-	}
-}
-
-// WithStreamTimeout sets the stream timeout
-func WithStreamTimeout(d time.Duration) CallOption {
-	return func(o *CallOptions) {
-		o.StreamTimeout = d
-	}
-}
-
-// WithDialTimeout is a CallOption which overrides that which
-// set in Options.CallOptions
-func WithDialTimeout(d time.Duration) CallOption {
-	return func(o *CallOptions) {
-		o.DialTimeout = d
-	}
-}
-
-// WithAuthToken is a CallOption which overrides the
+// AuthToken is a CallOption which overrides the
 // authorization header with the services own auth token
-func WithAuthToken(t string) CallOption {
-	return func(o *CallOptions) {
-		o.AuthToken = t
+func AuthToken(t string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, t, ".AuthToken")
 	}
 }
 
-// WithNetwork is a CallOption which sets the network attribute
-func WithNetwork(n string) CallOption {
-	return func(o *CallOptions) {
-		o.Network = n
-	}
-}
-
-// WithRouter sets the router to use for this call
-func WithRouter(r router.Router) CallOption {
-	return func(o *CallOptions) {
-		o.Router = r
-	}
-}
-
-// WithSelector sets the selector to use for this call
-func WithSelector(s selector.Selector) CallOption {
-	return func(o *CallOptions) {
-		o.Selector = s
+// Network is a CallOption which sets the network attribute
+func Network(n string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, n, ".Network")
 	}
 }
 
+/*
 // WithSelectOptions sets the options to pass to the selector for this call
-func WithSelectOptions(sops ...selector.SelectOption) CallOption {
+func WithSelectOptions(sops ...selector.SelectOption) options.Option {
 	return func(o *CallOptions) {
 		o.SelectOptions = sops
 	}
 }
-
-// WithMessageContentType sets the message content type
-// Deprecated
-func WithMessageContentType(ct string) MessageOption {
-	return func(o *MessageOptions) {
-		o.Metadata.Set(metadata.HeaderContentType, ct)
-		o.ContentType = ct
-	}
-}
-
-// MessageContentType sets the message content type
-func MessageContentType(ct string) MessageOption {
-	return func(o *MessageOptions) {
-		o.Metadata.Set(metadata.HeaderContentType, ct)
-		o.ContentType = ct
-	}
-}
-
-// MessageMetadata sets the message metadata
-func MessageMetadata(k, v string) MessageOption {
-	return func(o *MessageOptions) {
-		o.Metadata.Set(k, v)
-	}
-}
+*/
 
 // StreamingRequest specifies that request is streaming
-func StreamingRequest(b bool) RequestOption {
-	return func(o *RequestOptions) {
-		o.Stream = b
-	}
-}
-
-// RequestContentType specifies request content type
-func RequestContentType(ct string) RequestOption {
-	return func(o *RequestOptions) {
-		o.ContentType = ct
+func StreamingRequest(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".Stream")
 	}
 }

client/retry.go

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

client/retry_test.go

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

client/test_request.go

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

codec/codec.go

@@ -1,11 +1,11 @@
 // Package codec is an interface for encoding messages
-package codec // import "go.unistack.org/micro/v3/codec"
+package codec // import "go.unistack.org/micro/v4/codec"
 
 import (
 	"errors"
 	"io"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 // Message types

codec/frame.proto

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

codec/options.go

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

config/config.go

@@ -1,11 +1,13 @@
 // Package config is an interface for dynamic configuration.
-package config // import "go.unistack.org/micro/v3/config"
+package config // import "go.unistack.org/micro/v4/config"
 
 import (
 	"context"
 	"errors"
 	"reflect"
 	"time"
+
+	"go.unistack.org/micro/v4/options"
 )
 
 type Validator interface {
@@ -37,15 +39,15 @@ type Config interface {
 	// Name returns name of config
 	Name() string
 	// Init the config
-	Init(opts ...Option) error
+	Init(opts ...options.Option) error
 	// Options in the config
 	Options() Options
 	// Load config from sources
-	Load(context.Context, ...LoadOption) error
+	Load(context.Context, ...options.Option) error
 	// Save config to sources
-	Save(context.Context, ...SaveOption) error
+	Save(context.Context, ...options.Option) error
 	// Watch a config for changes
-	Watch(context.Context, ...WatchOption) (Watcher, error)
+	Watch(context.Context, ...options.Option) (Watcher, error)
 	// String returns config type name
 	String() string
 }
@@ -59,7 +61,7 @@ type Watcher interface {
 }
 
 // Load loads config from config sources
-func Load(ctx context.Context, cs []Config, opts ...LoadOption) error {
+func Load(ctx context.Context, cs []Config, opts ...options.Option) error {
 	var err error
 	for _, c := range cs {
 		if err = c.Init(); err != nil {

config/context.go

@@ -22,43 +22,3 @@ func NewContext(ctx context.Context, c Config) context.Context {
 	}
 	return context.WithValue(ctx, configKey{}, c)
 }
-
-// SetOption returns a function to setup a context with given value
-func SetOption(k, v interface{}) Option {
-	return func(o *Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}
-
-// SetSaveOption returns a function to setup a context with given value
-func SetSaveOption(k, v interface{}) SaveOption {
-	return func(o *SaveOptions) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}
-
-// SetLoadOption returns a function to setup a context with given value
-func SetLoadOption(k, v interface{}) LoadOption {
-	return func(o *LoadOptions) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}
-
-// SetWatchOption returns a function to setup a context with given value
-func SetWatchOption(k, v interface{}) WatchOption {
-	return func(o *WatchOptions) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}

config/context_test.go

@@ -40,47 +40,3 @@ func TestNewContext(t *testing.T) {
 		t.Fatal("NewContext not works")
 	}
 }
-
-func TestSetOption(t *testing.T) {
-	type key struct{}
-	o := SetOption(key{}, "test")
-	opts := &Options{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetOption not works")
-	}
-}
-
-func TestSetSaveOption(t *testing.T) {
-	type key struct{}
-	o := SetSaveOption(key{}, "test")
-	opts := &SaveOptions{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetSaveOption not works")
-	}
-}
-
-func TestSetLoadOption(t *testing.T) {
-	type key struct{}
-	o := SetLoadOption(key{}, "test")
-	opts := &LoadOptions{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetLoadOption not works")
-	}
-}
-
-func TestSetWatchOption(t *testing.T) {
-	type key struct{}
-	o := SetWatchOption(key{}, "test")
-	opts := &WatchOptions{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetWatchOption not works")
-	}
-}

config/default.go

@@ -7,9 +7,12 @@ import (
 	"strings"
 	"time"
 
+	"github.com/google/uuid"
 	"github.com/imdario/mergo"
-	rutil "go.unistack.org/micro/v3/util/reflect"
-	mtime "go.unistack.org/micro/v3/util/time"
+	"go.unistack.org/micro/v4/options"
+	mid "go.unistack.org/micro/v4/util/id"
+	rutil "go.unistack.org/micro/v4/util/reflect"
+	mtime "go.unistack.org/micro/v4/util/time"
 )
 
 type defaultConfig struct {
@@ -20,7 +23,7 @@ func (c *defaultConfig) Options() Options {
 	return c.opts
 }
 
-func (c *defaultConfig) Init(opts ...Option) error {
+func (c *defaultConfig) Init(opts ...options.Option) error {
 	for _, o := range opts {
 		o(&c.opts)
 	}
@@ -36,7 +39,7 @@ func (c *defaultConfig) Init(opts ...Option) error {
 	return nil
 }
 
-func (c *defaultConfig) Load(ctx context.Context, opts ...LoadOption) error {
+func (c *defaultConfig) Load(ctx context.Context, opts ...options.Option) error {
 	if err := DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
@@ -124,6 +127,20 @@ func fillValue(value reflect.Value, val string) error {
 		}
 		value.Set(reflect.ValueOf(v))
 	case reflect.String:
+		switch val {
+		case "micro:generate uuid":
+			uid, err := uuid.NewRandom()
+			if err != nil {
+				return err
+			}
+			val = uid.String()
+		case "micro:generate id":
+			uid, err := mid.New()
+			if err != nil {
+				return err
+			}
+			val = uid
+		}
 		value.Set(reflect.ValueOf(val))
 	case reflect.Float32:
 		v, err := strconv.ParseFloat(val, 32)
@@ -169,7 +186,7 @@ func fillValue(value reflect.Value, val string) error {
 				return err
 			}
 			value.Set(reflect.ValueOf(v))
-		case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "go.unistack.org/micro/v3/util/time":
+		case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "go.unistack.org/micro/v4/util/time":
 			v, err := mtime.ParseDuration(val)
 			if err != nil {
 				return err
@@ -275,7 +292,7 @@ func fillValues(valueOf reflect.Value, tname string) error {
 	return nil
 }
 
-func (c *defaultConfig) Save(ctx context.Context, opts ...SaveOption) error {
+func (c *defaultConfig) Save(ctx context.Context, opts ...options.Option) error {
 	if err := DefaultBeforeSave(ctx, c); err != nil {
 		return err
 	}
@@ -295,12 +312,12 @@ func (c *defaultConfig) Name() string {
 	return c.opts.Name
 }
 
-func (c *defaultConfig) Watch(ctx context.Context, opts ...WatchOption) (Watcher, error) {
+func (c *defaultConfig) Watch(ctx context.Context, opts ...options.Option) (Watcher, error) {
 	return nil, ErrWatcherNotImplemented
 }
 
 // NewConfig returns new default config source
-func NewConfig(opts ...Option) Config {
+func NewConfig(opts ...options.Option) Config {
 	options := NewOptions(opts...)
 	if len(options.StructTag) == 0 {
 		options.StructTag = "default"

config/default_test.go

@@ -6,8 +6,9 @@ import (
 	"testing"
 	"time"
 
-	"go.unistack.org/micro/v3/config"
-	mtime "go.unistack.org/micro/v3/util/time"
+	"go.unistack.org/micro/v4/config"
+	mid "go.unistack.org/micro/v4/util/id"
+	mtime "go.unistack.org/micro/v4/util/time"
 )
 
 type cfg struct {
@@ -17,6 +18,9 @@ type cfg struct {
 	IntValue       int             `default:"99"`
 	DurationValue  time.Duration   `default:"10s"`
 	MDurationValue mtime.Duration  `default:"10s"`
+	MapValue       map[string]bool `default:"key1=true,key2=false"`
+	UUIDValue      string          `default:"micro:generate uuid"`
+	IDValue        string          `default:"micro:generate id"`
 }
 
 type cfgStructValue struct {
@@ -67,6 +71,21 @@ func TestDefault(t *testing.T) {
 	if conf.StringValue != "after_load" {
 		t.Fatal("AfterLoad option not working")
 	}
+	if len(conf.MapValue) != 2 {
+		t.Fatalf("map value invalid: %#+v\n", conf.MapValue)
+	}
+
+	if conf.UUIDValue == "" {
+		t.Fatalf("uuid value empty")
+	} else if len(conf.UUIDValue) != 36 {
+		t.Fatalf("uuid value invalid: %s", conf.UUIDValue)
+	}
+
+	if conf.IDValue == "" {
+		t.Fatalf("id value empty")
+	} else if len(conf.IDValue) != mid.DefaultSize {
+		t.Fatalf("id value invalid: %s", conf.IDValue)
+	}
 	_ = conf
 	// t.Logf("%#+v\n", conf)
 }

config/options.go

@@ -4,10 +4,11 @@ import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options hold the config options
@@ -44,11 +45,8 @@ type Options struct {
 	AllowFail bool
 }
 
-// Option function signature
-type Option func(o *Options)
-
 // NewOptions new options struct with filed values
-func NewOptions(opts ...Option) Options {
+func NewOptions(opts ...options.Option) Options {
 	options := Options{
 		Logger:  logger.DefaultLogger,
 		Meter:   meter.DefaultMeter,
@@ -62,9 +60,6 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
-// LoadOption function signature
-type LoadOption func(o *LoadOptions)
-
 // LoadOptions struct
 type LoadOptions struct {
 	Struct   interface{}
@@ -74,7 +69,7 @@ type LoadOptions struct {
 }
 
 // NewLoadOptions create LoadOptions struct with provided opts
-func NewLoadOptions(opts ...LoadOption) LoadOptions {
+func NewLoadOptions(opts ...options.Option) LoadOptions {
 	options := LoadOptions{}
 	for _, o := range opts {
 		o(&options)
@@ -83,44 +78,27 @@ func NewLoadOptions(opts ...LoadOption) LoadOptions {
 }
 
 // LoadOverride override values when load
-func LoadOverride(b bool) LoadOption {
-	return func(o *LoadOptions) {
-		o.Override = b
+func LoadOverride(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".Override")
 	}
 }
 
 // LoadAppend override values when load
-func LoadAppend(b bool) LoadOption {
-	return func(o *LoadOptions) {
-		o.Append = b
+func LoadAppend(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".Append")
 	}
 }
 
-// LoadStruct override struct for loading
-func LoadStruct(src interface{}) LoadOption {
-	return func(o *LoadOptions) {
-		o.Struct = src
-	}
-}
-
-// SaveOption function signature
-type SaveOption func(o *SaveOptions)
-
 // SaveOptions struct
 type SaveOptions struct {
 	Struct  interface{}
 	Context context.Context
 }
 
-// SaveStruct override struct for save to config
-func SaveStruct(src interface{}) SaveOption {
-	return func(o *SaveOptions) {
-		o.Struct = src
-	}
-}
-
 // NewSaveOptions fill SaveOptions struct
-func NewSaveOptions(opts ...SaveOption) SaveOptions {
+func NewSaveOptions(opts ...options.Option) SaveOptions {
 	options := SaveOptions{}
 	for _, o := range opts {
 		o(&options)
@@ -129,100 +107,65 @@ func NewSaveOptions(opts ...SaveOption) SaveOptions {
 }
 
 // AllowFail allows config source to fail
-func AllowFail(b bool) Option {
-	return func(o *Options) {
-		o.AllowFail = b
+func AllowFail(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".AllowFail")
 	}
 }
 
 // BeforeInit run funcs before config Init
-func BeforeInit(fn ...func(context.Context, Config) error) Option {
-	return func(o *Options) {
-		o.BeforeInit = fn
+func BeforeInit(fn ...func(context.Context, Config) error) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".BeforeInit")
 	}
 }
 
 // AfterInit run funcs after config Init
-func AfterInit(fn ...func(context.Context, Config) error) Option {
-	return func(o *Options) {
-		o.AfterInit = fn
+func AfterInit(fn ...func(context.Context, Config) error) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".AfterInit")
 	}
 }
 
 // BeforeLoad run funcs before config load
-func BeforeLoad(fn ...func(context.Context, Config) error) Option {
-	return func(o *Options) {
-		o.BeforeLoad = fn
+func BeforeLoad(fn ...func(context.Context, Config) error) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".BeforeLoad")
 	}
 }
 
 // AfterLoad run funcs after config load
-func AfterLoad(fn ...func(context.Context, Config) error) Option {
-	return func(o *Options) {
-		o.AfterLoad = fn
+func AfterLoad(fn ...func(context.Context, Config) error) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".AfterLoad")
 	}
 }
 
 // BeforeSave run funcs before save
-func BeforeSave(fn ...func(context.Context, Config) error) Option {
-	return func(o *Options) {
-		o.BeforeSave = fn
+func BeforeSave(fn ...func(context.Context, Config) error) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".BeforeSave")
 	}
 }
 
 // AfterSave run fncs after save
-func AfterSave(fn ...func(context.Context, Config) error) Option {
-	return func(o *Options) {
-		o.AfterSave = fn
-	}
-}
-
-// Context pass context
-func Context(ctx context.Context) Option {
-	return func(o *Options) {
-		o.Context = ctx
-	}
-}
-
-// Codec sets the source codec
-func Codec(c codec.Codec) Option {
-	return func(o *Options) {
-		o.Codec = c
-	}
-}
-
-// Logger sets the logger
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
-// Tracer to be used for tracing
-func Tracer(t tracer.Tracer) Option {
-	return func(o *Options) {
-		o.Tracer = t
+func AfterSave(fn ...func(context.Context, Config) error) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fn, ".AfterSave")
 	}
 }
 
 // Struct used as config
-func Struct(v interface{}) Option {
-	return func(o *Options) {
-		o.Struct = v
+func Struct(v interface{}) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, v, ".Struct")
 	}
 }
 
 // StructTag sets the struct tag that used for filling
-func StructTag(name string) Option {
-	return func(o *Options) {
-		o.StructTag = name
-	}
-}
-
-// Name sets the name
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
+func StructTag(name string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, name, ".StructTag")
 	}
 }
 
@@ -240,11 +183,8 @@ type WatchOptions struct {
 	Coalesce bool
 }
 
-// WatchOption func signature
-type WatchOption func(*WatchOptions)
-
 // NewWatchOptions create WatchOptions struct with provided opts
-func NewWatchOptions(opts ...WatchOption) WatchOptions {
+func NewWatchOptions(opts ...options.Option) WatchOptions {
 	options := WatchOptions{
 		Context:     context.Background(),
 		MinInterval: DefaultWatcherMinInterval,
@@ -256,31 +196,20 @@ func NewWatchOptions(opts ...WatchOption) WatchOptions {
 	return options
 }
 
-// WatchContext pass context
-func WatchContext(ctx context.Context) WatchOption {
-	return func(o *WatchOptions) {
-		o.Context = ctx
-	}
-}
-
-// WatchCoalesce controls watch event combining
-func WatchCoalesce(b bool) WatchOption {
-	return func(o *WatchOptions) {
-		o.Coalesce = b
+// Coalesce controls watch event combining
+func WatchCoalesce(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".Coalesce")
 	}
 }
 
 // WatchInterval specifies min and max time.Duration for pulling changes
-func WatchInterval(min, max time.Duration) WatchOption {
-	return func(o *WatchOptions) {
-		o.MinInterval = min
-		o.MaxInterval = max
-	}
-}
-
-// WatchStruct overrides struct for fill
-func WatchStruct(src interface{}) WatchOption {
-	return func(o *WatchOptions) {
-		o.Struct = src
+func WatchInterval(min, max time.Duration) options.Option {
+	return func(src interface{}) error {
+		var err error
+		if err = options.Set(src, min, ".MinInterval"); err == nil {
+			err = options.Set(src, max, ".MaxInterval")
+		}
+		return err
 	}
 }

errors/errors.go

@@ -1,6 +1,6 @@
 // Package errors provides a way to return detailed information
 // for an RPC request error. The error is normally JSON encoded.
-package errors // import "go.unistack.org/micro/v3/errors"
+package errors // import "go.unistack.org/micro/v4/errors"
 
 import (
 	"bytes"

errors/errors.proto

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

event.go

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

flow/context.go

@@ -22,13 +22,3 @@ func NewContext(ctx context.Context, f Flow) context.Context {
 	}
 	return context.WithValue(ctx, flowKey{}, f)
 }
-
-// SetOption returns a function to setup a context with given value
-func SetOption(k, v interface{}) Option {
-	return func(o *Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}

flow/context_test.go

@@ -40,14 +40,3 @@ func TestNewContext(t *testing.T) {
 		t.Fatal("NewContext not works")
 	}
 }
-
-func TestSetOption(t *testing.T) {
-	type key struct{}
-	o := SetOption(key{}, "test")
-	opts := &Options{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetOption not works")
-	}
-}

flow/default.go

@@ -6,12 +6,14 @@ import (
 	"sync"
 
 	"github.com/silas/dag"
-	"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/store"
-	"go.unistack.org/micro/v3/util/id"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/options"
+	moptions "go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/store"
+	"go.unistack.org/micro/v4/util/id"
 )
 
 type microFlow struct {
@@ -163,7 +165,7 @@ func (w *microWorkflow) Resume(ctx context.Context, id string) error {
 	return workflowStore.Write(ctx, "status", &codec.Frame{Data: []byte(StatusRunning.String())})
 }
 
-func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (string, error) {
+func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...options.Option) (string, error) {
 	w.Lock()
 	if !w.init {
 		if err := w.g.Validate(); err != nil {
@@ -200,13 +202,13 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 	nctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	nopts := make([]ExecuteOption, 0, len(opts)+5)
+	nopts := make([]moptions.Option, 0, len(opts)+5)
 
 	nopts = append(nopts,
-		ExecuteClient(w.opts.Client),
-		ExecuteTracer(w.opts.Tracer),
-		ExecuteLogger(w.opts.Logger),
-		ExecuteMeter(w.opts.Meter),
+		moptions.Client(w.opts.Client),
+		moptions.Tracer(w.opts.Tracer),
+		moptions.Logger(w.opts.Logger),
+		moptions.Meter(w.opts.Meter),
 	)
 	nopts = append(nopts, opts...)
 	done := make(chan struct{})
@@ -349,7 +351,7 @@ func (w *microWorkflow) Execute(ctx context.Context, req *Message, opts ...Execu
 }
 
 // NewFlow create new flow
-func NewFlow(opts ...Option) Flow {
+func NewFlow(opts ...options.Option) Flow {
 	options := NewOptions(opts...)
 	return &microFlow{opts: options}
 }
@@ -358,7 +360,7 @@ func (f *microFlow) Options() Options {
 	return f.opts
 }
 
-func (f *microFlow) Init(opts ...Option) error {
+func (f *microFlow) Init(opts ...options.Option) error {
 	for _, o := range opts {
 		o(&f.opts)
 	}
@@ -487,17 +489,17 @@ func (s *microCallStep) SetStatus(status Status) {
 	s.status = status
 }
 
-func (s *microCallStep) Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (*Message, error) {
+func (s *microCallStep) Execute(ctx context.Context, req *Message, opts ...options.Option) (*Message, error) {
 	options := NewExecuteOptions(opts...)
 	if options.Client == nil {
 		return nil, ErrMissingClient
 	}
 	rsp := &codec.Frame{}
-	copts := []client.CallOption{client.WithRetries(0)}
+	copts := []moptions.Option{client.Retries(0)}
 	if options.Timeout > 0 {
 		copts = append(copts,
-			client.WithRequestTimeout(options.Timeout),
-			client.WithDialTimeout(options.Timeout))
+			client.RequestTimeout(options.Timeout),
+			client.DialTimeout(options.Timeout))
 	}
 	nctx := metadata.NewOutgoingContext(ctx, req.Header)
 	err := options.Client.Call(nctx, options.Client.NewRequest(s.service, s.method, &codec.Frame{Data: req.Body}), rsp, copts...)
@@ -570,18 +572,18 @@ func (s *microPublishStep) SetStatus(status Status) {
 	s.status = status
 }
 
-func (s *microPublishStep) Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (*Message, error) {
+func (s *microPublishStep) Execute(ctx context.Context, req *Message, opts ...options.Option) (*Message, error) {
 	return nil, nil
 }
 
 // NewCallStep create new step with client.Call
-func NewCallStep(service string, name string, method string, opts ...StepOption) Step {
+func NewCallStep(service string, name string, method string, opts ...options.Option) Step {
 	options := NewStepOptions(opts...)
 	return &microCallStep{service: service, method: name + "." + method, opts: options}
 }
 
 // NewPublishStep create new step with client.Publish
-func NewPublishStep(topic string, opts ...StepOption) Step {
+func NewPublishStep(topic string, opts ...options.Option) Step {
 	options := NewStepOptions(opts...)
 	return &microPublishStep{topic: topic, opts: options}
 }

flow/flow.go

@@ -1,5 +1,5 @@
 // Package flow is an interface used for saga pattern microservice workflow
-package flow // import "go.unistack.org/micro/v3/flow"
+package flow // import "go.unistack.org/micro/v4/flow"
 
 import (
 	"context"
@@ -7,7 +7,8 @@ import (
 	"sync"
 	"sync/atomic"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/options"
 )
 
 var (
@@ -51,7 +52,7 @@ type Step interface {
 	// Endpoint returns rpc endpoint service_name.service_method or broker topic
 	Endpoint() string
 	// Execute step run
-	Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (*Message, error)
+	Execute(ctx context.Context, req *Message, opts ...options.Option) (*Message, error)
 	// Requires returns dependent steps
 	Requires() []string
 	// Options returns step options
@@ -118,7 +119,7 @@ type Workflow interface {
 	// ID returns id of the workflow
 	ID() string
 	// Execute workflow with args, return execution id and error
-	Execute(ctx context.Context, req *Message, opts ...ExecuteOption) (string, error)
+	Execute(ctx context.Context, req *Message, opts ...options.Option) (string, error)
 	// RemoveSteps remove steps from workflow
 	RemoveSteps(steps ...Step) error
 	// AppendSteps append steps to workflow
@@ -140,7 +141,7 @@ type Flow interface {
 	// Options returns options
 	Options() Options
 	// Init initialize
-	Init(...Option) error
+	Init(...options.Option) error
 	// WorkflowCreate creates new workflow with specific id and steps
 	WorkflowCreate(ctx context.Context, id string, steps ...Step) (Workflow, error)
 	// WorkflowSave saves workflow

flow/options.go

@@ -4,16 +4,14 @@ import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/store"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/store"
+	"go.unistack.org/micro/v4/tracer"
 )
 
-// Option func
-type Option func(*Options)
-
 // Options server struct
 type Options struct {
 	// Context holds the external options and can be used for flow shutdown
@@ -31,7 +29,7 @@ type Options struct {
 }
 
 // NewOptions returns new options struct with default or passed values
-func NewOptions(opts ...Option) Options {
+func NewOptions(opts ...options.Option) Options {
 	options := Options{
 		Context: context.Background(),
 		Logger:  logger.DefaultLogger,
@@ -47,66 +45,12 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
-// Logger sets the logger option
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
-// Meter sets the meter option
-func Meter(m meter.Meter) Option {
-	return func(o *Options) {
-		o.Meter = m
-	}
-}
-
-// Client to use for sync/async communication
-func Client(c client.Client) Option {
-	return func(o *Options) {
-		o.Client = c
-	}
-}
-
-// Context specifies a context for the service.
-// Can be used to signal shutdown of the flow
-// or can be used for extra option values.
-func Context(ctx context.Context) Option {
-	return func(o *Options) {
-		o.Context = ctx
-	}
-}
-
-// Tracer mechanism for distributed tracking
-func Tracer(t tracer.Tracer) Option {
-	return func(o *Options) {
-		o.Tracer = t
-	}
-}
-
-// Store used for intermediate results
-func Store(s store.Store) Option {
-	return func(o *Options) {
-		o.Store = s
-	}
-}
-
-// WorkflowOption func signature
-type WorkflowOption func(*WorkflowOptions)
-
 // WorkflowOptions holds workflow options
 type WorkflowOptions struct {
 	Context context.Context
 	ID      string
 }
 
-// WorkflowID set workflow id
-func WorkflowID(id string) WorkflowOption {
-	return func(o *WorkflowOptions) {
-		o.ID = id
-	}
-}
-
 // ExecuteOptions holds execute options
 type ExecuteOptions struct {
 	// Client holds the client.Client
@@ -129,67 +73,22 @@ type ExecuteOptions struct {
 	Async bool
 }
 
-// ExecuteOption func signature
-type ExecuteOption func(*ExecuteOptions)
-
-// ExecuteClient pass client.Client to ExecuteOption
-func ExecuteClient(c client.Client) ExecuteOption {
-	return func(o *ExecuteOptions) {
-		o.Client = c
+// Reverse says that dag must be run in reverse order
+func Reverse(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".Reverse")
 	}
 }
 
-// ExecuteTracer pass tracer.Tracer to ExecuteOption
-func ExecuteTracer(t tracer.Tracer) ExecuteOption {
-	return func(o *ExecuteOptions) {
-		o.Tracer = t
-	}
-}
-
-// ExecuteLogger pass logger.Logger to ExecuteOption
-func ExecuteLogger(l logger.Logger) ExecuteOption {
-	return func(o *ExecuteOptions) {
-		o.Logger = l
-	}
-}
-
-// ExecuteMeter pass meter.Meter to ExecuteOption
-func ExecuteMeter(m meter.Meter) ExecuteOption {
-	return func(o *ExecuteOptions) {
-		o.Meter = m
-	}
-}
-
-// ExecuteContext pass context.Context ot ExecuteOption
-func ExecuteContext(ctx context.Context) ExecuteOption {
-	return func(o *ExecuteOptions) {
-		o.Context = ctx
-	}
-}
-
-// ExecuteReverse says that dag must be run in reverse order
-func ExecuteReverse(b bool) ExecuteOption {
-	return func(o *ExecuteOptions) {
-		o.Reverse = b
-	}
-}
-
-// ExecuteTimeout pass timeout time.Duration for execution
-func ExecuteTimeout(td time.Duration) ExecuteOption {
-	return func(o *ExecuteOptions) {
-		o.Timeout = td
-	}
-}
-
-// ExecuteAsync says that caller does not wait for execution complete
-func ExecuteAsync(b bool) ExecuteOption {
-	return func(o *ExecuteOptions) {
-		o.Async = b
+// Async says that caller does not wait for execution complete
+func Async(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".Async")
 	}
 }
 
 // NewExecuteOptions create new ExecuteOptions struct
-func NewExecuteOptions(opts ...ExecuteOption) ExecuteOptions {
+func NewExecuteOptions(opts ...options.Option) ExecuteOptions {
 	options := ExecuteOptions{
 		Client:  client.DefaultClient,
 		Logger:  logger.DefaultLogger,
@@ -211,11 +110,8 @@ type StepOptions struct {
 	Requires []string
 }
 
-// StepOption func signature
-type StepOption func(*StepOptions)
-
 // NewStepOptions create new StepOptions struct
-func NewStepOptions(opts ...StepOption) StepOptions {
+func NewStepOptions(opts ...options.Option) StepOptions {
 	options := StepOptions{
 		Context: context.Background(),
 	}
@@ -225,23 +121,23 @@ func NewStepOptions(opts ...StepOption) StepOptions {
 	return options
 }
 
-// StepID sets the step id for dag
-func StepID(id string) StepOption {
-	return func(o *StepOptions) {
-		o.ID = id
+// Requires specifies required steps
+func Requires(steps ...string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, steps, ".Requires")
 	}
 }
 
-// StepRequires specifies required steps
-func StepRequires(steps ...string) StepOption {
-	return func(o *StepOptions) {
-		o.Requires = steps
+// Fallback set the step to run on error
+func Fallback(step string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, step, ".Fallback")
 	}
 }
 
-// StepFallback set the step to run on error
-func StepFallback(step string) StepOption {
-	return func(o *StepOptions) {
-		o.Fallback = step
+// ID sets the step ID
+func StepID(id string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, id, ".ID")
 	}
 }

fsm/fsm.go

@@ -1,4 +1,4 @@
-package fsm // import "go.unistack.org/micro/v3/fsm"
+package fsm // import "go.unistack.org/micro/v4/fsm"
 
 import (
 	"context"

fsm/fsm_test.go

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

go.mod

@@ -1,9 +1,20 @@
-module go.unistack.org/micro/v3
+module go.unistack.org/micro/v4
 
-go 1.19
+go 1.20
 
 require (
-	github.com/imdario/mergo v0.3.14
+	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 v0.0.0-20211117232152-9d50aa809f35
+	github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5
+	golang.org/x/sync v0.1.0
+	golang.org/x/sys v0.7.0
+	google.golang.org/grpc v1.54.0
+	google.golang.org/protobuf v1.30.0
+)
+
+require (
+	github.com/golang/protobuf v1.5.3 // indirect
+	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
 )

go.sum

@@ -1,9 +1,33 @@
-github.com/imdario/mergo v0.3.14 h1:fOqeC1+nCuuk6PKQdg9YmosXX7Y7mHX6R/0ZldI9iHo=
-github.com/imdario/mergo v0.3.14/go.mod h1:WBLT9ZmE3lPoWsEzCh9LPo3TiwVN+ZKEjmz+hD27ysY=
+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=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/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 v0.0.0-20211117232152-9d50aa809f35 h1:4mohWoM/UGg1BvFFiqSPRl5uwJY3rVV0HQX0ETqauqQ=
-github.com/silas/dag v0.0.0-20211117232152-9d50aa809f35/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
+github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5 h1:G/FZtUu7a6NTWl3KUHMV9jkLAh/Rvtf03NWMHaEDl+E=
+github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
+golang.org/x/net v0.8.0 h1:Zrh2ngAOFYneWTAIAPethzeaQLuHwhuBkuV6ZiRnUaQ=
+golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
+golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.8.0 h1:57P1ETyNKtuIjB4SRd15iJxuhj8Gc416Y78H3qgMh68=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 h1:KpwkzHKEF7B9Zxg18WzOa7djJ+Ha5DzthMyZYQfEn2A=
+google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1/go.mod h1:nKE/iIaLqn2bQwXBg8f1g2Ylh6r5MN5CmZvuzZCgsCU=
+google.golang.org/grpc v1.54.0 h1:EhTqbhiYeixwWQtAEZAxmV9MGqcjEU2mFx52xCzNyag=
+google.golang.org/grpc v1.54.0/go.mod h1:PUSEXI6iWghWaB6lXM4knEgpJNu2qUcKfDtNci3EC2g=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
+google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

logger/context.go

@@ -20,13 +20,3 @@ func NewContext(ctx context.Context, l Logger) context.Context {
 	}
 	return context.WithValue(ctx, loggerKey{}, l)
 }
-
-// SetOption returns a function to setup a context with given value
-func SetOption(k, v interface{}) Option {
-	return func(o *Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}

logger/context_test.go

@@ -40,14 +40,3 @@ func TestNewContext(t *testing.T) {
 		t.Fatal("NewContext not works")
 	}
 }
-
-func TestSetOption(t *testing.T) {
-	type key struct{}
-	o := SetOption(key{}, "test")
-	opts := &Options{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetOption not works")
-	}
-}

logger/default.go

@@ -9,6 +9,8 @@ import (
 	"strings"
 	"sync"
 	"time"
+
+	"go.unistack.org/micro/v4/options"
 )
 
 type defaultLogger struct {
@@ -18,7 +20,7 @@ type defaultLogger struct {
 }
 
 // Init(opts...) should only overwrite provided options
-func (l *defaultLogger) Init(opts ...Option) error {
+func (l *defaultLogger) Init(opts ...options.Option) error {
 	l.Lock()
 	for _, o := range opts {
 		o(&l.opts)
@@ -33,7 +35,7 @@ func (l *defaultLogger) String() string {
 	return "micro"
 }
 
-func (l *defaultLogger) Clone(opts ...Option) Logger {
+func (l *defaultLogger) Clone(opts ...options.Option) Logger {
 	newopts := NewOptions(opts...)
 	oldopts := l.opts
 	for _, o := range opts {
@@ -221,7 +223,7 @@ func (l *defaultLogger) Options() Options {
 }
 
 // NewLogger builds a new logger based on options
-func NewLogger(opts ...Option) Logger {
+func NewLogger(opts ...options.Option) Logger {
 	l := &defaultLogger{
 		opts: NewOptions(opts...),
 	}

logger/logger.go

@@ -1,9 +1,11 @@
 // Package logger provides a log interface
-package logger // import "go.unistack.org/micro/v3/logger"
+package logger // import "go.unistack.org/micro/v4/logger"
 
 import (
 	"context"
 	"os"
+
+	"go.unistack.org/micro/v4/options"
 )
 
 var (
@@ -18,9 +20,9 @@ var (
 // Logger is a generic logging interface
 type Logger interface {
 	// Init initialises options
-	Init(opts ...Option) error
+	Init(opts ...options.Option) error
 	// Clone create logger copy with new options
-	Clone(opts ...Option) Logger
+	Clone(opts ...options.Option) Logger
 	// V compare provided verbosity level with current log level
 	V(level Level) bool
 	// Level sets the log level for logger
@@ -130,7 +132,7 @@ func V(level Level) bool {
 }
 
 // Init initialize logger
-func Init(opts ...Option) error {
+func Init(opts ...options.Option) error {
 	return DefaultLogger.Init(opts...)
 }
 

logger/options.go

@@ -4,10 +4,9 @@ import (
 	"context"
 	"io"
 	"os"
-)
 
-// Option func
-type Option func(*Options)
+	"go.unistack.org/micro/v4/options"
+)
 
 // Options holds logger options
 type Options struct {
@@ -26,7 +25,7 @@ type Options struct {
 }
 
 // NewOptions creates new options struct
-func NewOptions(opts ...Option) Options {
+func NewOptions(opts ...options.Option) Options {
 	options := Options{
 		Level:           DefaultLevel,
 		Fields:          make([]interface{}, 0, 6),
@@ -41,43 +40,29 @@ func NewOptions(opts ...Option) Options {
 }
 
 // WithFields set default fields for the logger
-func WithFields(fields ...interface{}) Option {
-	return func(o *Options) {
-		o.Fields = fields
+func WithFields(fields ...interface{}) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, fields, ".Fields")
 	}
 }
 
 // WithLevel set default level for the logger
-func WithLevel(level Level) Option {
-	return func(o *Options) {
-		o.Level = level
+func WithLevel(lvl Level) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, lvl, ".Level")
 	}
 }
 
 // WithOutput set default output writer for the logger
-func WithOutput(out io.Writer) Option {
-	return func(o *Options) {
-		o.Out = out
+func WithOutput(out io.Writer) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, out, ".Out")
 	}
 }
 
 // WithCallerSkipCount set frame count to skip
-func WithCallerSkipCount(c int) Option {
-	return func(o *Options) {
-		o.CallerSkipCount = c
-	}
-}
-
-// WithContext set context
-func WithContext(ctx context.Context) Option {
-	return func(o *Options) {
-		o.Context = ctx
-	}
-}
-
-// WithName sets the name
-func WithName(n string) Option {
-	return func(o *Options) {
-		o.Name = n
+func WithCallerSkipCount(c int) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, c, ".CallerSkipCount")
 	}
 }

logger/unwrap/unwrap.go

@@ -8,7 +8,7 @@ import (
 	"strconv"
 	"strings"
 
-	"go.unistack.org/micro/v3/codec"
+	"go.unistack.org/micro/v4/codec"
 )
 
 const sf = "0-+# "

logger/unwrap/unwrap_test.go

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

logger/wrapper/wrapper.go

@@ -5,9 +5,9 @@ import (
 	"context"
 	"fmt"
 
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/server"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/server"
 )
 
 var (
@@ -29,15 +29,6 @@ var (
 		return labels
 	}
 
-	// DefaultClientPublishObserver called by wrapper in client Publish
-	DefaultClientPublishObserver = func(ctx context.Context, msg client.Message, opts []client.PublishOption, err error) []string {
-		labels := []string{"endpoint", msg.Topic()}
-		if err != nil {
-			labels = append(labels, "error", err.Error())
-		}
-		return labels
-	}
-
 	// DefaultServerHandlerObserver called by wrapper in server Handler
 	DefaultServerHandlerObserver = func(ctx context.Context, req server.Request, rsp interface{}, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
@@ -47,15 +38,6 @@ var (
 		return labels
 	}
 
-	// DefaultServerSubscriberObserver called by wrapper in server Subscriber
-	DefaultServerSubscriberObserver = func(ctx context.Context, msg server.Message, err error) []string {
-		labels := []string{"endpoint", msg.Topic()}
-		if err != nil {
-			labels = append(labels, "error", err.Error())
-		}
-		return labels
-	}
-
 	// DefaultClientCallFuncObserver called by wrapper in client CallFunc
 	DefaultClientCallFuncObserver = func(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions, err error) []string {
 		labels := []string{"service", req.Service(), "endpoint", req.Endpoint()}
@@ -72,7 +54,6 @@ var (
 type lWrapper struct {
 	client.Client
 	serverHandler  server.HandlerFunc
-	serverSubscriber server.SubscriberFunc
 	clientCallFunc client.CallFunc
 	opts           Options
 }
@@ -82,14 +63,10 @@ type (
 	ClientCallObserver func(context.Context, client.Request, interface{}, []client.CallOption, error) []string
 	// ClientStreamObserver func signature
 	ClientStreamObserver func(context.Context, client.Request, []client.CallOption, client.Stream, error) []string
-	// ClientPublishObserver func signature
-	ClientPublishObserver func(context.Context, client.Message, []client.PublishOption, error) []string
 	// ClientCallFuncObserver func signature
 	ClientCallFuncObserver func(context.Context, string, client.Request, interface{}, client.CallOptions, error) []string
 	// ServerHandlerObserver func signature
 	ServerHandlerObserver func(context.Context, server.Request, interface{}, error) []string
-	// ServerSubscriberObserver func signature
-	ServerSubscriberObserver func(context.Context, server.Message, error) []string
 )
 
 // Options struct for wrapper
@@ -98,14 +75,10 @@ type Options struct {
 	Logger logger.Logger
 	// ServerHandlerObservers funcs
 	ServerHandlerObservers []ServerHandlerObserver
-	// ServerSubscriberObservers funcs
-	ServerSubscriberObservers []ServerSubscriberObserver
 	// ClientCallObservers funcs
 	ClientCallObservers []ClientCallObserver
 	// ClientStreamObservers funcs
 	ClientStreamObservers []ClientStreamObserver
-	// ClientPublishObservers funcs
-	ClientPublishObservers []ClientPublishObserver
 	// ClientCallFuncObservers funcs
 	ClientCallFuncObservers []ClientCallFuncObserver
 	// SkipEndpoints
@@ -126,10 +99,8 @@ func NewOptions(opts ...Option) Options {
 		Level:                   logger.TraceLevel,
 		ClientCallObservers:     []ClientCallObserver{DefaultClientCallObserver},
 		ClientStreamObservers:   []ClientStreamObserver{DefaultClientStreamObserver},
-		ClientPublishObservers:    []ClientPublishObserver{DefaultClientPublishObserver},
 		ClientCallFuncObservers: []ClientCallFuncObserver{DefaultClientCallFuncObserver},
 		ServerHandlerObservers:  []ServerHandlerObserver{DefaultServerHandlerObserver},
-		ServerSubscriberObservers: []ServerSubscriberObserver{DefaultServerSubscriberObserver},
 		SkipEndpoints:           DefaultSkipEndpoints,
 	}
 
@@ -175,13 +146,6 @@ func WithClientStreamObservers(ob ...ClientStreamObserver) Option {
 	}
 }
 
-// WithClientPublishObservers funcs
-func WithClientPublishObservers(ob ...ClientPublishObserver) Option {
-	return func(o *Options) {
-		o.ClientPublishObservers = ob
-	}
-}
-
 // WithClientCallFuncObservers funcs
 func WithClientCallFuncObservers(ob ...ClientCallFuncObserver) Option {
 	return func(o *Options) {
@@ -196,13 +160,6 @@ func WithServerHandlerObservers(ob ...ServerHandlerObserver) Option {
 	}
 }
 
-// WithServerSubscriberObservers funcs
-func WithServerSubscriberObservers(ob ...ServerSubscriberObserver) Option {
-	return func(o *Options) {
-		o.ServerSubscriberObservers = ob
-	}
-}
-
 // SkipEndpoins
 func SkipEndpoints(eps ...string) Option {
 	return func(o *Options) {
@@ -256,29 +213,6 @@ func (l *lWrapper) Stream(ctx context.Context, req client.Request, opts ...clien
 	return stream, err
 }
 
-func (l *lWrapper) Publish(ctx context.Context, msg client.Message, opts ...client.PublishOption) error {
-	err := l.Client.Publish(ctx, msg, opts...)
-
-	endpoint := msg.Topic()
-	for _, ep := range l.opts.SkipEndpoints {
-		if ep == endpoint {
-			return err
-		}
-	}
-
-	if !l.opts.Enabled {
-		return err
-	}
-
-	var labels []string
-	for _, o := range l.opts.ClientPublishObservers {
-		labels = append(labels, o(ctx, msg, opts, err)...)
-	}
-	l.opts.Logger.Fields(labels).Log(ctx, l.opts.Level)
-
-	return err
-}
-
 func (l *lWrapper) ServerHandler(ctx context.Context, req server.Request, rsp interface{}) error {
 	err := l.serverHandler(ctx, req, rsp)
 
@@ -302,29 +236,6 @@ func (l *lWrapper) ServerHandler(ctx context.Context, req server.Request, rsp in
 	return err
 }
 
-func (l *lWrapper) ServerSubscriber(ctx context.Context, msg server.Message) error {
-	err := l.serverSubscriber(ctx, msg)
-
-	endpoint := msg.Topic()
-	for _, ep := range l.opts.SkipEndpoints {
-		if ep == endpoint {
-			return err
-		}
-	}
-
-	if !l.opts.Enabled {
-		return err
-	}
-
-	var labels []string
-	for _, o := range l.opts.ServerSubscriberObservers {
-		labels = append(labels, o(ctx, msg, err)...)
-	}
-	l.opts.Logger.Fields(labels).Log(ctx, l.opts.Level)
-
-	return err
-}
-
 // NewClientWrapper accepts an open options and returns a Client Wrapper
 func NewClientWrapper(opts ...Option) client.Wrapper {
 	return func(c client.Client) client.Client {
@@ -384,16 +295,3 @@ func NewServerHandlerWrapper(opts ...Option) server.HandlerWrapper {
 		return l.ServerHandler
 	}
 }
-
-// NewServerSubscriberWrapper accepts an options and returns a Subscriber Wrapper
-func NewServerSubscriberWrapper(opts ...Option) server.SubscriberWrapper {
-	return func(h server.SubscriberFunc) server.SubscriberFunc {
-		options := NewOptions()
-		for _, o := range opts {
-			o(&options)
-		}
-
-		l := &lWrapper{opts: options, serverSubscriber: h}
-		return l.ServerSubscriber
-	}
-}

metadata/context.go

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

metadata/metadata.go

@@ -1,5 +1,5 @@
 // Package metadata is a way of defining message headers
-package metadata // import "go.unistack.org/micro/v3/metadata"
+package metadata // import "go.unistack.org/micro/v4/metadata"
 
 import (
 	"net/textproto"

meter/context.go

@@ -22,13 +22,3 @@ func NewContext(ctx context.Context, c Meter) context.Context {
 	}
 	return context.WithValue(ctx, meterKey{}, c)
 }
-
-// SetOption returns a function to setup a context with given value
-func SetOption(k, v interface{}) Option {
-	return func(o *Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}

meter/context_test.go

@@ -40,14 +40,3 @@ func TestNewContext(t *testing.T) {
 		t.Fatal("NewContext not works")
 	}
 }
-
-func TestSetOption(t *testing.T) {
-	type key struct{}
-	o := SetOption(key{}, "test")
-	opts := &Options{}
-	o(opts)
-
-	if v, ok := opts.Context.Value(key{}).(string); !ok || v == "" {
-		t.Fatal("SetOption not works")
-	}
-}

meter/meter.go

@@ -1,5 +1,5 @@
 // Package meter is for instrumentation
-package meter // import "go.unistack.org/micro/v3/meter"
+package meter // import "go.unistack.org/micro/v4/meter"
 
 import (
 	"io"
@@ -7,6 +7,8 @@ import (
 	"strconv"
 	"strings"
 	"time"
+
+	"go.unistack.org/micro/v4/options"
 )
 
 var (
@@ -31,9 +33,9 @@ type Meter interface {
 	// Name returns meter name
 	Name() string
 	// Init initialize meter
-	Init(opts ...Option) error
+	Init(opts ...options.Option) error
 	// Clone create meter copy with new options
-	Clone(opts ...Option) Meter
+	Clone(opts ...options.Option) Meter
 	// Counter get or create counter
 	Counter(name string, labels ...string) Counter
 	// FloatCounter get or create float counter
@@ -41,7 +43,7 @@ type Meter interface {
 	// Gauge get or create gauge
 	Gauge(name string, fn func() float64, labels ...string) Gauge
 	// Set create new meter metrics set
-	Set(opts ...Option) Meter
+	Set(opts ...options.Option) Meter
 	// Histogram get or create histogram
 	Histogram(name string, labels ...string) Histogram
 	// Summary get or create summary
@@ -49,7 +51,7 @@ type Meter interface {
 	// SummaryExt get or create summary with spcified quantiles and window time
 	SummaryExt(name string, window time.Duration, quantiles []float64, labels ...string) Summary
 	// Write writes metrics to io.Writer
-	Write(w io.Writer, opts ...Option) error
+	Write(w io.Writer, opts ...options.Option) error
 	// Options returns meter options
 	Options() Options
 	// String return meter type

meter/noop.go

@@ -3,6 +3,8 @@ package meter
 import (
 	"io"
 	"time"
+
+	"go.unistack.org/micro/v4/options"
 )
 
 // NoopMeter is an noop implementation of Meter
@@ -11,12 +13,12 @@ type noopMeter struct {
 }
 
 // NewMeter returns a configured noop reporter:
-func NewMeter(opts ...Option) Meter {
+func NewMeter(opts ...options.Option) Meter {
 	return &noopMeter{opts: NewOptions(opts...)}
 }
 
 // Clone return old meter with new options
-func (r *noopMeter) Clone(opts ...Option) Meter {
+func (r *noopMeter) Clone(opts ...options.Option) Meter {
 	options := r.opts
 	for _, o := range opts {
 		o(&options)
@@ -29,7 +31,7 @@ func (r *noopMeter) Name() string {
 }
 
 // Init initialize options
-func (r *noopMeter) Init(opts ...Option) error {
+func (r *noopMeter) Init(opts ...options.Option) error {
 	for _, o := range opts {
 		o(&r.opts)
 	}
@@ -67,7 +69,7 @@ func (r *noopMeter) Histogram(name string, labels ...string) Histogram {
 }
 
 // Set implements the Meter interface
-func (r *noopMeter) Set(opts ...Option) Meter {
+func (r *noopMeter) Set(opts ...options.Option) Meter {
 	m := &noopMeter{opts: r.opts}
 
 	for _, o := range opts {
@@ -77,7 +79,7 @@ func (r *noopMeter) Set(opts ...Option) Meter {
 	return m
 }
 
-func (r *noopMeter) Write(w io.Writer, opts ...Option) error {
+func (r *noopMeter) Write(_ io.Writer, _ ...options.Option) error {
 	return nil
 }
 

meter/options.go

@@ -2,13 +2,13 @@ package meter
 
 import (
 	"context"
+	"reflect"
 
-	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/options"
+	rutil "go.unistack.org/micro/v4/util/reflect"
 )
 
-// Option powers the configuration for metrics implementations:
-type Option func(*Options)
-
 // Options for metrics implementations
 type Options struct {
 	// Logger used for logging
@@ -34,7 +34,7 @@ type Options struct {
 }
 
 // NewOptions prepares a set of options:
-func NewOptions(opt ...Option) Options {
+func NewOptions(opt ...options.Option) Options {
 	opts := Options{
 		Address:      DefaultAddress,
 		Path:         DefaultPath,
@@ -52,37 +52,23 @@ func NewOptions(opt ...Option) Options {
 }
 
 // LabelPrefix sets the labels prefix
-func LabelPrefix(pref string) Option {
-	return func(o *Options) {
-		o.LabelPrefix = pref
+func LabelPrefix(pref string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, pref, ".LabelPrefix")
 	}
 }
 
 // MetricPrefix sets the metric prefix
-func MetricPrefix(pref string) Option {
-	return func(o *Options) {
-		o.MetricPrefix = pref
-	}
-}
-
-// Context sets the metrics context
-func Context(ctx context.Context) Option {
-	return func(o *Options) {
-		o.Context = ctx
+func MetricPrefix(pref string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, pref, ".MetricPrefix")
 	}
 }
 
 // Path used to serve metrics over HTTP
-func Path(value string) Option {
-	return func(o *Options) {
-		o.Path = value
-	}
-}
-
-// Address is the listen address to serve metrics
-func Address(value string) Option {
-	return func(o *Options) {
-		o.Address = value
+func Path(path string) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, path, ".Path")
 	}
 }
 
@@ -95,37 +81,34 @@ 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) {
-		o.Labels = append(o.Labels, ls...)
+func Labels(ls ...string) options.Option {
+	return func(src interface{}) error {
+		v, err := options.Get(src, ".Labels")
+		if err != nil {
+			return err
+		} else if rutil.IsZero(v) {
+			v = reflect.MakeSlice(reflect.TypeOf(v), 0, len(ls)).Interface()
 		}
+		cv := reflect.ValueOf(v)
+		for _, l := range ls {
+			reflect.Append(cv, reflect.ValueOf(l))
 		}
-
-// Name sets the name
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
+		err = options.Set(src, cv, ".Labels")
+		return err
 	}
 }
 
 // WriteProcessMetrics enable process metrics output for write
-func WriteProcessMetrics(b bool) Option {
-	return func(o *Options) {
-		o.WriteProcessMetrics = b
+func WriteProcessMetrics(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".WriteProcessMetrics")
 	}
 }
 
 // WriteFDMetrics enable fd metrics output for write
-func WriteFDMetrics(b bool) Option {
-	return func(o *Options) {
-		o.WriteFDMetrics = b
+func WriteFDMetrics(b bool) options.Option {
+	return func(src interface{}) error {
+		return options.Set(src, b, ".WriteFDMetrics")
 	}
 }

meter/wrapper/wrapper.go

@@ -1,49 +1,17 @@
-package wrapper // import "go.unistack.org/micro/v3/meter/wrapper"
+package wrapper // import "go.unistack.org/micro/v4/meter/wrapper"
 
 import (
 	"context"
 	"fmt"
 	"time"
 
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/server"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/semconv"
+	"go.unistack.org/micro/v4/server"
 )
 
 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"
-	// 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"
-	// 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"
-
 	labelSuccess  = "success"
 	labelFailure  = "failure"
 	labelStatus   = "status"
@@ -150,21 +118,21 @@ func (w *wrapper) CallFunc(ctx context.Context, addr string, req client.Request,
 	labels := make([]string, 0, 4)
 	labels = append(labels, labelEndpoint, endpoint)
 
-	w.opts.Meter.Counter(ClientRequestInflight, labels...).Inc()
+	w.opts.Meter.Counter(semconv.ClientRequestInflight, labels...).Inc()
 	ts := time.Now()
 	err := w.callFunc(ctx, addr, req, rsp, opts)
 	te := time.Since(ts)
-	w.opts.Meter.Counter(ClientRequestInflight, labels...).Dec()
+	w.opts.Meter.Counter(semconv.ClientRequestInflight, labels...).Dec()
 
-	w.opts.Meter.Summary(ClientRequestLatencyMicroseconds, labels...).Update(te.Seconds())
-	w.opts.Meter.Histogram(ClientRequestDurationSeconds, labels...).Update(te.Seconds())
+	w.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, labels...).Update(te.Seconds())
+	w.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, labels...).Update(te.Seconds())
 
 	if err == nil {
 		labels = append(labels, labelStatus, labelSuccess)
 	} else {
 		labels = append(labels, labelStatus, labelFailure)
 	}
-	w.opts.Meter.Counter(ClientRequestTotal, labels...).Inc()
+	w.opts.Meter.Counter(semconv.ClientRequestTotal, labels...).Inc()
 
 	return err
 }
@@ -180,21 +148,21 @@ func (w *wrapper) Call(ctx context.Context, req client.Request, rsp interface{},
 	labels := make([]string, 0, 4)
 	labels = append(labels, labelEndpoint, endpoint)
 
-	w.opts.Meter.Counter(ClientRequestInflight, labels...).Inc()
+	w.opts.Meter.Counter(semconv.ClientRequestInflight, labels...).Inc()
 	ts := time.Now()
 	err := w.Client.Call(ctx, req, rsp, opts...)
 	te := time.Since(ts)
-	w.opts.Meter.Counter(ClientRequestInflight, labels...).Dec()
+	w.opts.Meter.Counter(semconv.ClientRequestInflight, labels...).Dec()
 
-	w.opts.Meter.Summary(ClientRequestLatencyMicroseconds, labels...).Update(te.Seconds())
-	w.opts.Meter.Histogram(ClientRequestDurationSeconds, labels...).Update(te.Seconds())
+	w.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, labels...).Update(te.Seconds())
+	w.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, labels...).Update(te.Seconds())
 
 	if err == nil {
 		labels = append(labels, labelStatus, labelSuccess)
 	} else {
 		labels = append(labels, labelStatus, labelFailure)
 	}
-	w.opts.Meter.Counter(ClientRequestTotal, labels...).Inc()
+	w.opts.Meter.Counter(semconv.ClientRequestTotal, labels...).Inc()
 
 	return err
 }
@@ -210,59 +178,25 @@ func (w *wrapper) Stream(ctx context.Context, req client.Request, opts ...client
 	labels := make([]string, 0, 4)
 	labels = append(labels, labelEndpoint, endpoint)
 
-	w.opts.Meter.Counter(ClientRequestInflight, labels...).Inc()
+	w.opts.Meter.Counter(semconv.ClientRequestInflight, labels...).Inc()
 	ts := time.Now()
 	stream, err := w.Client.Stream(ctx, req, opts...)
 	te := time.Since(ts)
-	w.opts.Meter.Counter(ClientRequestInflight, labels...).Dec()
+	w.opts.Meter.Counter(semconv.ClientRequestInflight, labels...).Dec()
 
-	w.opts.Meter.Summary(ClientRequestLatencyMicroseconds, labels...).Update(te.Seconds())
-	w.opts.Meter.Histogram(ClientRequestDurationSeconds, labels...).Update(te.Seconds())
+	w.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, labels...).Update(te.Seconds())
+	w.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, labels...).Update(te.Seconds())
 
 	if err == nil {
 		labels = append(labels, labelStatus, labelSuccess)
 	} else {
 		labels = append(labels, labelStatus, labelFailure)
 	}
-	w.opts.Meter.Counter(ClientRequestTotal, labels...).Inc()
+	w.opts.Meter.Counter(semconv.ClientRequestTotal, labels...).Inc()
 
 	return stream, err
 }
 
-func (w *wrapper) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
-	endpoint := p.Topic()
-
-	labels := make([]string, 0, 4)
-	labels = append(labels, labelEndpoint, endpoint)
-
-	w.opts.Meter.Counter(PublishMessageInflight, labels...).Inc()
-	ts := time.Now()
-	err := w.Client.Publish(ctx, p, opts...)
-	te := time.Since(ts)
-	w.opts.Meter.Counter(PublishMessageInflight, labels...).Dec()
-
-	w.opts.Meter.Summary(PublishMessageLatencyMicroseconds, labels...).Update(te.Seconds())
-	w.opts.Meter.Histogram(PublishMessageDurationSeconds, labels...).Update(te.Seconds())
-
-	if err == nil {
-		labels = append(labels, labelStatus, labelSuccess)
-	} else {
-		labels = append(labels, labelStatus, labelFailure)
-	}
-	w.opts.Meter.Counter(PublishMessageTotal, labels...).Inc()
-
-	return err
-}
-
-// NewHandlerWrapper create new server handler wrapper
-// deprecated
-func NewHandlerWrapper(opts ...Option) server.HandlerWrapper {
-	handler := &wrapper{
-		opts: NewOptions(opts...),
-	}
-	return handler.HandlerFunc
-}
-
 // NewServerHandlerWrapper create new server handler wrapper
 func NewServerHandlerWrapper(opts ...Option) server.HandlerWrapper {
 	handler := &wrapper{
@@ -283,64 +217,21 @@ func (w *wrapper) HandlerFunc(fn server.HandlerFunc) server.HandlerFunc {
 		labels := make([]string, 0, 4)
 		labels = append(labels, labelEndpoint, endpoint)
 
-		w.opts.Meter.Counter(ServerRequestInflight, labels...).Inc()
+		w.opts.Meter.Counter(semconv.ServerRequestInflight, labels...).Inc()
 		ts := time.Now()
 		err := fn(ctx, req, rsp)
 		te := time.Since(ts)
-		w.opts.Meter.Counter(ServerRequestInflight, labels...).Dec()
+		w.opts.Meter.Counter(semconv.ServerRequestInflight, labels...).Dec()
 
-		w.opts.Meter.Summary(ServerRequestLatencyMicroseconds, labels...).Update(te.Seconds())
-		w.opts.Meter.Histogram(ServerRequestDurationSeconds, labels...).Update(te.Seconds())
+		w.opts.Meter.Summary(semconv.ServerRequestLatencyMicroseconds, labels...).Update(te.Seconds())
+		w.opts.Meter.Histogram(semconv.ServerRequestDurationSeconds, labels...).Update(te.Seconds())
 
 		if err == nil {
 			labels = append(labels, labelStatus, labelSuccess)
 		} else {
 			labels = append(labels, labelStatus, labelFailure)
 		}
-		w.opts.Meter.Counter(ServerRequestTotal, labels...).Inc()
-
-		return err
-	}
-}
-
-// NewSubscriberWrapper create server subscribe wrapper
-// deprecated
-func NewSubscriberWrapper(opts ...Option) server.SubscriberWrapper {
-	handler := &wrapper{
-		opts: NewOptions(opts...),
-	}
-	return handler.SubscriberFunc
-}
-
-func NewServerSubscriberWrapper(opts ...Option) server.SubscriberWrapper {
-	handler := &wrapper{
-		opts: NewOptions(opts...),
-	}
-	return handler.SubscriberFunc
-}
-
-func (w *wrapper) SubscriberFunc(fn server.SubscriberFunc) server.SubscriberFunc {
-	return func(ctx context.Context, msg server.Message) error {
-		endpoint := msg.Topic()
-
-		labels := make([]string, 0, 4)
-		labels = append(labels, labelEndpoint, endpoint)
-
-		w.opts.Meter.Counter(SubscribeMessageInflight, labels...).Inc()
-		ts := time.Now()
-		err := fn(ctx, msg)
-		te := time.Since(ts)
-		w.opts.Meter.Counter(SubscribeMessageInflight, labels...).Dec()
-
-		w.opts.Meter.Summary(SubscribeMessageLatencyMicroseconds, labels...).Update(te.Seconds())
-		w.opts.Meter.Histogram(SubscribeMessageDurationSeconds, labels...).Update(te.Seconds())
-
-		if err == nil {
-			labels = append(labels, labelStatus, labelSuccess)
-		} else {
-			labels = append(labels, labelStatus, labelFailure)
-		}
-		w.opts.Meter.Counter(SubscribeMessageTotal, labels...).Inc()
+		w.opts.Meter.Counter(semconv.ServerRequestTotal, labels...).Inc()
 
 		return err
 	}

mtls/mtls.go

@@ -1,4 +1,4 @@
-package mtls // import "go.unistack.org/micro/v3/mtls"
+package mtls // import "go.unistack.org/micro/v4/mtls"
 
 import (
 	"bytes"

network/network.go

@@ -1,55 +0,0 @@
-// Package network is for creating internetworks
-package network // import "go.unistack.org/micro/v3/network"
-
-import (
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/server"
-)
-
-// Error is network node errors
-type Error interface {
-	// Count is current count of errors
-	Count() int
-	// Msg is last error message
-	Msg() string
-}
-
-// Status is node status
-type Status interface {
-	// Error reports error status
-	Error() Error
-}
-
-// Node is network node
-type Node interface {
-	// Id is node id
-	Id() string
-	// Address is node bind address
-	Address() string
-	// Peers returns node peers
-	Peers() []Node
-	// Network is the network node is in
-	Network() Network
-	// Status returns node status
-	Status() Status
-}
-
-// Network is micro network
-type Network interface {
-	// Node is network node
-	Node
-	// Initialise options
-	Init(...Option) error
-	// Options returns the network options
-	Options() Options
-	// Name of the network
-	Name() string
-	// Connect starts the resolver and tunnel server
-	Connect() error
-	// Close stops the tunnel and resolving
-	Close() error
-	// Client is micro client
-	Client() client.Client
-	// Server is micro server
-	Server() server.Server
-}

network/options.go

@@ -1,135 +0,0 @@
-package network
-
-import (
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/network/tunnel"
-	"go.unistack.org/micro/v3/proxy"
-	"go.unistack.org/micro/v3/router"
-	"go.unistack.org/micro/v3/tracer"
-	"go.unistack.org/micro/v3/util/id"
-)
-
-// Option func
-type Option func(*Options)
-
-// Options configure network
-type Options struct {
-	// Router used for routing
-	Router router.Router
-	// Proxy holds the proxy
-	Proxy proxy.Proxy
-	// Logger used for logging
-	Logger logger.Logger
-	// Meter used for metrics
-	Meter meter.Meter
-	// Tracer used for tracing
-	Tracer tracer.Tracer
-	// Tunnel used for transfer data
-	Tunnel tunnel.Tunnel
-	// ID of the node
-	ID string
-	// Name of the network
-	Name string
-	// Address to bind to
-	Address string
-	// Advertise sets the address to advertise
-	Advertise string
-	// Nodes is a list of nodes to connect to
-	Nodes []string
-}
-
-// ID sets the id of the network node
-func ID(id string) Option {
-	return func(o *Options) {
-		o.ID = id
-	}
-}
-
-// Name sets the network name
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
-	}
-}
-
-// Address sets the network address
-func Address(a string) Option {
-	return func(o *Options) {
-		o.Address = a
-	}
-}
-
-// Advertise sets the address to advertise
-func Advertise(a string) Option {
-	return func(o *Options) {
-		o.Advertise = a
-	}
-}
-
-// Nodes is a list of nodes to connect to
-func Nodes(n ...string) Option {
-	return func(o *Options) {
-		o.Nodes = n
-	}
-}
-
-// Tunnel sets the network tunnel
-func Tunnel(t tunnel.Tunnel) Option {
-	return func(o *Options) {
-		o.Tunnel = t
-	}
-}
-
-// Router sets the network router
-func Router(r router.Router) Option {
-	return func(o *Options) {
-		o.Router = r
-	}
-}
-
-// Proxy sets the network proxy
-func Proxy(p proxy.Proxy) Option {
-	return func(o *Options) {
-		o.Proxy = p
-	}
-}
-
-// Logger sets the network logger
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
-// Meter sets the meter
-func Meter(m meter.Meter) Option {
-	return func(o *Options) {
-		o.Meter = m
-	}
-}
-
-// Tracer to be used for tracing
-func Tracer(t tracer.Tracer) Option {
-	return func(o *Options) {
-		o.Tracer = t
-	}
-}
-
-// NewOptions returns network default options
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		ID:      id.Must(),
-		Name:    "go.micro",
-		Address: ":0",
-		Logger:  logger.DefaultLogger,
-		Meter:   meter.DefaultMeter,
-		Tracer:  tracer.DefaultTracer,
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return options
-}

network/transport/context.go

@@ -1,34 +0,0 @@
-package transport
-
-import (
-	"context"
-)
-
-type transportKey struct{}
-
-// FromContext get transport from context
-func FromContext(ctx context.Context) (Transport, bool) {
-	if ctx == nil {
-		return nil, false
-	}
-	c, ok := ctx.Value(transportKey{}).(Transport)
-	return c, ok
-}
-
-// NewContext put transport in context
-func NewContext(ctx context.Context, c Transport) context.Context {
-	if ctx == nil {
-		ctx = context.Background()
-	}
-	return context.WithValue(ctx, transportKey{}, c)
-}
-
-// SetOption returns a function to setup a context with given value
-func SetOption(k, v interface{}) Option {
-	return func(o *Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, k, v)
-	}
-}

network/transport/memory.go

@@ -1,258 +0,0 @@
-package transport
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"net"
-	"sync"
-	"time"
-
-	maddr "go.unistack.org/micro/v3/util/addr"
-	mnet "go.unistack.org/micro/v3/util/net"
-	"go.unistack.org/micro/v3/util/rand"
-)
-
-type memorySocket struct {
-	ctx     context.Context
-	recv    chan *Message
-	exit    chan bool
-	lexit   chan bool
-	send    chan *Message
-	local   string
-	remote  string
-	timeout time.Duration
-	sync.RWMutex
-}
-
-type memoryClient struct {
-	*memorySocket
-	opts DialOptions
-}
-
-type memoryListener struct {
-	lopts ListenOptions
-	ctx   context.Context
-	exit  chan bool
-	conn  chan *memorySocket
-	addr  string
-	topts Options
-	sync.RWMutex
-}
-
-type memoryTransport struct {
-	listeners map[string]*memoryListener
-	opts      Options
-	sync.RWMutex
-}
-
-func (ms *memorySocket) Recv(m *Message) error {
-	ms.RLock()
-	defer ms.RUnlock()
-
-	ctx := ms.ctx
-	if ms.timeout > 0 {
-		var cancel context.CancelFunc
-		ctx, cancel = context.WithTimeout(ms.ctx, ms.timeout)
-		defer cancel()
-	}
-
-	select {
-	case <-ctx.Done():
-		return ctx.Err()
-	case <-ms.exit:
-		return errors.New("connection closed")
-	case <-ms.lexit:
-		return errors.New("server connection closed")
-	case cm := <-ms.recv:
-		*m = *cm
-	}
-	return nil
-}
-
-func (ms *memorySocket) Local() string {
-	return ms.local
-}
-
-func (ms *memorySocket) Remote() string {
-	return ms.remote
-}
-
-func (ms *memorySocket) Send(m *Message) error {
-	ms.RLock()
-	defer ms.RUnlock()
-
-	ctx := ms.ctx
-	if ms.timeout > 0 {
-		var cancel context.CancelFunc
-		ctx, cancel = context.WithTimeout(ms.ctx, ms.timeout)
-		defer cancel()
-	}
-
-	select {
-	case <-ctx.Done():
-		return ctx.Err()
-	case <-ms.exit:
-		return errors.New("connection closed")
-	case <-ms.lexit:
-		return errors.New("server connection closed")
-	case ms.send <- m:
-	}
-	return nil
-}
-
-func (ms *memorySocket) Close() error {
-	ms.Lock()
-	defer ms.Unlock()
-	select {
-	case <-ms.exit:
-		return nil
-	default:
-		close(ms.exit)
-	}
-	return nil
-}
-
-func (m *memoryListener) Addr() string {
-	return m.addr
-}
-
-func (m *memoryListener) Close() error {
-	m.Lock()
-	defer m.Unlock()
-	select {
-	case <-m.exit:
-		return nil
-	default:
-		close(m.exit)
-	}
-	return nil
-}
-
-func (m *memoryListener) Accept(fn func(Socket)) error {
-	for {
-		select {
-		case <-m.exit:
-			return nil
-		case c := <-m.conn:
-			go fn(&memorySocket{
-				lexit:   c.lexit,
-				exit:    c.exit,
-				send:    c.recv,
-				recv:    c.send,
-				local:   c.Remote(),
-				remote:  c.Local(),
-				timeout: m.topts.Timeout,
-				ctx:     m.topts.Context,
-			})
-		}
-	}
-}
-
-func (m *memoryTransport) Dial(ctx context.Context, addr string, opts ...DialOption) (Client, error) {
-	m.RLock()
-	defer m.RUnlock()
-
-	listener, ok := m.listeners[addr]
-	if !ok {
-		return nil, errors.New("could not dial " + addr)
-	}
-
-	options := NewDialOptions(opts...)
-
-	client := &memoryClient{
-		&memorySocket{
-			send:    make(chan *Message),
-			recv:    make(chan *Message),
-			exit:    make(chan bool),
-			lexit:   listener.exit,
-			local:   addr,
-			remote:  addr,
-			timeout: m.opts.Timeout,
-			ctx:     m.opts.Context,
-		},
-		options,
-	}
-
-	// pseudo connect
-	select {
-	case <-listener.exit:
-		return nil, errors.New("connection error")
-	case listener.conn <- client.memorySocket:
-	}
-
-	return client, nil
-}
-
-func (m *memoryTransport) Listen(ctx context.Context, addr string, opts ...ListenOption) (Listener, error) {
-	m.Lock()
-	defer m.Unlock()
-
-	options := NewListenOptions(opts...)
-
-	host, port, err := net.SplitHostPort(addr)
-	if err != nil {
-		return nil, err
-	}
-
-	addr, err = maddr.Extract(host)
-	if err != nil {
-		return nil, err
-	}
-
-	// if zero port then randomly assign one
-	if len(port) > 0 && port == "0" {
-		var rng rand.Rand
-		i := rng.Intn(20000)
-		port = fmt.Sprintf("%d", 10000+i)
-	}
-
-	// set addr with port
-	addr = mnet.HostPort(addr, port)
-
-	if _, ok := m.listeners[addr]; ok {
-		return nil, errors.New("already listening on " + addr)
-	}
-
-	listener := &memoryListener{
-		lopts: options,
-		topts: m.opts,
-		addr:  addr,
-		conn:  make(chan *memorySocket),
-		exit:  make(chan bool),
-		ctx:   m.opts.Context,
-	}
-
-	m.listeners[addr] = listener
-
-	return listener, nil
-}
-
-func (m *memoryTransport) Init(opts ...Option) error {
-	for _, o := range opts {
-		o(&m.opts)
-	}
-	return nil
-}
-
-func (m *memoryTransport) Options() Options {
-	return m.opts
-}
-
-func (m *memoryTransport) String() string {
-	return "memory"
-}
-
-func (m *memoryTransport) Name() string {
-	return m.opts.Name
-}
-
-// NewTransport returns new memory transport with options
-func NewTransport(opts ...Option) Transport {
-	options := NewOptions(opts...)
-
-	return &memoryTransport{
-		opts:      options,
-		listeners: make(map[string]*memoryListener),
-	}
-}

network/transport/memory_test.go

@@ -1,100 +0,0 @@
-package transport
-
-import (
-	"context"
-	"os"
-	"testing"
-)
-
-func TestMemoryTransport(t *testing.T) {
-	tr := NewTransport()
-	ctx := context.Background()
-	// bind / listen
-	l, err := tr.Listen(ctx, "127.0.0.1:8080")
-	if err != nil {
-		t.Fatalf("Unexpected error listening %v", err)
-	}
-	defer l.Close()
-
-	cherr := make(chan error, 1)
-	// accept
-	go func() {
-		if nerr := l.Accept(func(sock Socket) {
-			for {
-				var m Message
-				if rerr := sock.Recv(&m); rerr != nil {
-					cherr <- rerr
-					return
-				}
-				if len(os.Getenv("INTEGRATION_TESTS")) == 0 {
-					t.Logf("Server Received %s", string(m.Body))
-				}
-				if cerr := sock.Send(&Message{
-					Body: []byte(`pong`),
-				}); cerr != nil {
-					cherr <- cerr
-					return
-				}
-			}
-		}); nerr != nil {
-			cherr <- err
-		}
-	}()
-
-	// dial
-	c, err := tr.Dial(ctx, "127.0.0.1:8080")
-	if err != nil {
-		t.Fatalf("Unexpected error dialing %v", err)
-	}
-	defer c.Close()
-
-	select {
-	case err := <-cherr:
-		t.Fatal(err)
-	default:
-		// send <=> receive
-		for i := 0; i < 3; i++ {
-			if err := c.Send(&Message{
-				Body: []byte(`ping`),
-			}); err != nil {
-				return
-			}
-			var m Message
-			if err := c.Recv(&m); err != nil {
-				return
-			}
-			if len(os.Getenv("INTEGRATION_TESTS")) == 0 {
-				t.Logf("Client Received %s", string(m.Body))
-			}
-		}
-	}
-}
-
-func TestListener(t *testing.T) {
-	tr := NewTransport()
-	ctx := context.Background()
-	// bind / listen on random port
-	l, err := tr.Listen(ctx, ":0")
-	if err != nil {
-		t.Fatalf("Unexpected error listening %v", err)
-	}
-	defer l.Close()
-
-	// try again
-	l2, err := tr.Listen(ctx, ":0")
-	if err != nil {
-		t.Fatalf("Unexpected error listening %v", err)
-	}
-	defer l2.Close()
-
-	// now make sure it still fails
-	l3, err := tr.Listen(ctx, ":8080")
-	if err != nil {
-		t.Fatalf("Unexpected error listening %v", err)
-	}
-	defer l3.Close()
-
-	if _, err := tr.Listen(ctx, ":8080"); err == nil {
-		t.Fatal("Expected error binding to :8080 got nil")
-	}
-}

network/transport/options.go

@@ -1,175 +0,0 @@
-package transport
-
-import (
-	"context"
-	"crypto/tls"
-	"time"
-
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/tracer"
-)
-
-// Options struct holds the transport options
-type Options struct {
-	// Meter used for metrics
-	Meter meter.Meter
-	// Tracer used for tracing
-	Tracer tracer.Tracer
-	// Codec used for marshal/unmarshal messages
-	Codec codec.Codec
-	// Logger used for logging
-	Logger logger.Logger
-	// Context holds external options
-	Context context.Context
-	// TLSConfig holds tls.TLSConfig options
-	TLSConfig *tls.Config
-	// Name holds the transport name
-	Name string
-	// Addrs holds the transport addrs
-	Addrs []string
-	// Timeout holds the timeout
-	Timeout time.Duration
-}
-
-// NewOptions returns new options
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Logger:  logger.DefaultLogger,
-		Meter:   meter.DefaultMeter,
-		Tracer:  tracer.DefaultTracer,
-		Context: context.Background(),
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return options
-}
-
-// DialOptions struct
-type DialOptions struct {
-	// Context holds the external options
-	Context context.Context
-	// Timeout holds the timeout
-	Timeout time.Duration
-	// Stream flag
-	Stream bool
-}
-
-// NewDialOptions returns new DialOptions
-func NewDialOptions(opts ...DialOption) DialOptions {
-	options := DialOptions{
-		Timeout: DefaultDialTimeout,
-		Context: context.Background(),
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return options
-}
-
-// ListenOptions struct
-type ListenOptions struct {
-	// TODO: add tls options when listening
-	// Currently set in global options
-	// Context holds the external options
-	Context context.Context
-	// TLSConfig holds the *tls.Config options
-	TLSConfig *tls.Config
-}
-
-// NewListenOptions returns new ListenOptions
-func NewListenOptions(opts ...ListenOption) ListenOptions {
-	options := ListenOptions{
-		Context: context.Background(),
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return options
-}
-
-// Addrs to use for transport
-func Addrs(addrs ...string) Option {
-	return func(o *Options) {
-		o.Addrs = addrs
-	}
-}
-
-// Logger sets the logger
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
-// Meter sets the meter
-func Meter(m meter.Meter) Option {
-	return func(o *Options) {
-		o.Meter = m
-	}
-}
-
-// Context sets the context
-func Context(ctx context.Context) Option {
-	return func(o *Options) {
-		o.Context = ctx
-	}
-}
-
-// Codec sets the codec used for encoding where the transport
-// does not support message headers
-func Codec(c codec.Codec) Option {
-	return func(o *Options) {
-		o.Codec = c
-	}
-}
-
-// Timeout sets the timeout for Send/Recv execution
-func Timeout(t time.Duration) Option {
-	return func(o *Options) {
-		o.Timeout = t
-	}
-}
-
-// TLSConfig to be used for the transport.
-func TLSConfig(t *tls.Config) Option {
-	return func(o *Options) {
-		o.TLSConfig = t
-	}
-}
-
-// WithStream indicates whether this is a streaming connection
-func WithStream() DialOption {
-	return func(o *DialOptions) {
-		o.Stream = true
-	}
-}
-
-// WithTimeout used when dialling the remote side
-func WithTimeout(d time.Duration) DialOption {
-	return func(o *DialOptions) {
-		o.Timeout = d
-	}
-}
-
-// Tracer to be used for tracing
-func Tracer(t tracer.Tracer) Option {
-	return func(o *Options) {
-		o.Tracer = t
-	}
-}
-
-// Name sets the name
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
-	}
-}

network/transport/transport.go

@@ -1,63 +0,0 @@
-// Package transport is an interface for synchronous connection based communication
-package transport // import "go.unistack.org/micro/v3/network/transport"
-
-import (
-	"context"
-	"time"
-
-	"go.unistack.org/micro/v3/metadata"
-)
-
-var (
-	// DefaultTransport is the global default transport
-	DefaultTransport Transport = NewTransport()
-	// DefaultDialTimeout the default dial timeout
-	DefaultDialTimeout = time.Second * 5
-)
-
-// Transport is an interface which is used for communication between
-// services. It uses connection based socket send/recv semantics and
-// has various implementations; http, grpc, quic.
-type Transport interface {
-	Init(...Option) error
-	Options() Options
-	Dial(ctx context.Context, addr string, opts ...DialOption) (Client, error)
-	Listen(ctx context.Context, addr string, opts ...ListenOption) (Listener, error)
-	String() string
-}
-
-// Message is used to transfer data
-type Message struct {
-	Header metadata.Metadata
-	Body   []byte
-}
-
-// Socket bastraction interface
-type Socket interface {
-	Recv(*Message) error
-	Send(*Message) error
-	Close() error
-	Local() string
-	Remote() string
-}
-
-// Client is the socket owner
-type Client interface {
-	Socket
-}
-
-// Listener is the interface for stream oriented messaging
-type Listener interface {
-	Addr() string
-	Close() error
-	Accept(func(Socket)) error
-}
-
-// Option is the option signature
-type Option func(*Options)
-
-// DialOption is the option signature
-type DialOption func(*DialOptions)
-
-// ListenOption is the option signature
-type ListenOption func(*ListenOptions)

network/tunnel/broker/broker.go

@@ -1,356 +0,0 @@
-// Package broker is a tunnel broker
-package broker // import "go.unistack.org/micro/v3/network/tunnel/broker"
-
-import (
-	"context"
-	"fmt"
-
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/network/transport"
-	"go.unistack.org/micro/v3/network/tunnel"
-)
-
-type tunBroker struct {
-	tunnel tunnel.Tunnel
-	opts   broker.Options
-}
-
-type tunSubscriber struct {
-	listener tunnel.Listener
-	handler  broker.Handler
-	closed   chan bool
-	topic    string
-	opts     broker.SubscribeOptions
-}
-
-type tunBatchSubscriber struct {
-	listener tunnel.Listener
-	handler  broker.BatchHandler
-	closed   chan bool
-	topic    string
-	opts     broker.SubscribeOptions
-}
-
-type tunEvent struct {
-	err     error
-	message *broker.Message
-	topic   string
-}
-
-// used to access tunnel from options context
-type (
-	tunnelKey  struct{}
-	tunnelAddr struct{}
-)
-
-func (t *tunBroker) Init(opts ...broker.Option) error {
-	for _, o := range opts {
-		o(&t.opts)
-	}
-	return nil
-}
-
-func (t *tunBroker) Name() string {
-	return t.opts.Name
-}
-
-func (t *tunBroker) Options() broker.Options {
-	return t.opts
-}
-
-func (t *tunBroker) Address() string {
-	return t.tunnel.Address()
-}
-
-func (t *tunBroker) Connect(ctx context.Context) error {
-	return t.tunnel.Connect(ctx)
-}
-
-func (t *tunBroker) Disconnect(ctx context.Context) error {
-	return t.tunnel.Close(ctx)
-}
-
-func (t *tunBroker) BatchPublish(ctx context.Context, msgs []*broker.Message, opts ...broker.PublishOption) error {
-	// TODO: this is probably inefficient, we might want to just maintain an open connection
-	// it may be easier to add broadcast to the tunnel
-	topicMap := make(map[string]tunnel.Session)
-
-	var err error
-	for _, msg := range msgs {
-		topic, _ := msg.Header.Get(metadata.HeaderTopic)
-		c, ok := topicMap[topic]
-		if !ok {
-			c, err = t.tunnel.Dial(ctx, topic, tunnel.DialMode(tunnel.Multicast))
-			if err != nil {
-				return err
-			}
-			defer c.Close()
-			topicMap[topic] = c
-		}
-
-		if err = c.Send(&transport.Message{
-			Header: msg.Header,
-			Body:   msg.Body,
-		}); err != nil {
-			//	msg.SetError(err)
-			return err
-		}
-	}
-
-	return nil
-}
-
-func (t *tunBroker) Publish(ctx context.Context, topic string, m *broker.Message, opts ...broker.PublishOption) error {
-	// TODO: this is probably inefficient, we might want to just maintain an open connection
-	// it may be easier to add broadcast to the tunnel
-	c, err := t.tunnel.Dial(ctx, topic, tunnel.DialMode(tunnel.Multicast))
-	if err != nil {
-		return err
-	}
-	defer c.Close()
-
-	return c.Send(&transport.Message{
-		Header: m.Header,
-		Body:   m.Body,
-	})
-}
-
-func (t *tunBroker) BatchSubscribe(ctx context.Context, topic string, h broker.BatchHandler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
-	l, err := t.tunnel.Listen(ctx, topic, tunnel.ListenMode(tunnel.Multicast))
-	if err != nil {
-		return nil, err
-	}
-
-	tunSub := &tunBatchSubscriber{
-		topic:    topic,
-		handler:  h,
-		opts:     broker.NewSubscribeOptions(opts...),
-		closed:   make(chan bool),
-		listener: l,
-	}
-
-	// start processing
-	go tunSub.run()
-
-	return tunSub, nil
-}
-
-func (t *tunBroker) Subscribe(ctx context.Context, topic string, h broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
-	l, err := t.tunnel.Listen(ctx, topic, tunnel.ListenMode(tunnel.Multicast))
-	if err != nil {
-		return nil, err
-	}
-
-	tunSub := &tunSubscriber{
-		topic:    topic,
-		handler:  h,
-		opts:     broker.NewSubscribeOptions(opts...),
-		closed:   make(chan bool),
-		listener: l,
-	}
-
-	// start processing
-	go tunSub.run()
-
-	return tunSub, nil
-}
-
-func (t *tunBroker) String() string {
-	return "tunnel"
-}
-
-func (t *tunBatchSubscriber) run() {
-	for {
-		// accept a new connection
-		c, err := t.listener.Accept()
-		if err != nil {
-			select {
-			case <-t.closed:
-				return
-			default:
-				continue
-			}
-		}
-
-		// receive message
-		m := new(transport.Message)
-		if err := c.Recv(m); err != nil {
-			if logger.V(logger.ErrorLevel) {
-				logger.Error(t.opts.Context, err.Error())
-			}
-			if err = c.Close(); err != nil {
-				if logger.V(logger.ErrorLevel) {
-					logger.Error(t.opts.Context, err.Error())
-				}
-			}
-			continue
-		}
-
-		// close the connection
-		c.Close()
-
-		evts := broker.Events{&tunEvent{
-			topic: t.topic,
-			message: &broker.Message{
-				Header: m.Header,
-				Body:   m.Body,
-			},
-		}}
-		// handle the message
-		go func() {
-			_ = t.handler(evts)
-		}()
-
-	}
-}
-
-func (t *tunSubscriber) run() {
-	for {
-		// accept a new connection
-		c, err := t.listener.Accept()
-		if err != nil {
-			select {
-			case <-t.closed:
-				return
-			default:
-				continue
-			}
-		}
-
-		// receive message
-		m := new(transport.Message)
-		if err := c.Recv(m); err != nil {
-			if logger.V(logger.ErrorLevel) {
-				logger.Error(t.opts.Context, err.Error())
-			}
-			if err = c.Close(); err != nil {
-				if logger.V(logger.ErrorLevel) {
-					logger.Error(t.opts.Context, err.Error())
-				}
-			}
-			continue
-		}
-
-		// close the connection
-		c.Close()
-
-		// handle the message
-		go func() {
-			_ = t.handler(&tunEvent{
-				topic: t.topic,
-				message: &broker.Message{
-					Header: m.Header,
-					Body:   m.Body,
-				},
-			})
-		}()
-	}
-}
-
-func (t *tunBatchSubscriber) Options() broker.SubscribeOptions {
-	return t.opts
-}
-
-func (t *tunBatchSubscriber) Topic() string {
-	return t.topic
-}
-
-func (t *tunBatchSubscriber) Unsubscribe(ctx context.Context) error {
-	select {
-	case <-t.closed:
-		return nil
-	default:
-		close(t.closed)
-		return t.listener.Close()
-	}
-}
-
-func (t *tunSubscriber) Options() broker.SubscribeOptions {
-	return t.opts
-}
-
-func (t *tunSubscriber) Topic() string {
-	return t.topic
-}
-
-func (t *tunSubscriber) Unsubscribe(ctx context.Context) error {
-	select {
-	case <-t.closed:
-		return nil
-	default:
-		close(t.closed)
-		return t.listener.Close()
-	}
-}
-
-func (t *tunEvent) Topic() string {
-	return t.topic
-}
-
-func (t *tunEvent) Message() *broker.Message {
-	return t.message
-}
-
-func (t *tunEvent) Ack() error {
-	return nil
-}
-
-func (t *tunEvent) Error() error {
-	return t.err
-}
-
-func (t *tunEvent) SetError(err error) {
-	t.err = err
-}
-
-// NewBroker returns new tunnel broker
-func NewBroker(opts ...broker.Option) (broker.Broker, error) {
-	options := broker.NewOptions(opts...)
-
-	t, ok := options.Context.Value(tunnelKey{}).(tunnel.Tunnel)
-	if !ok {
-		return nil, fmt.Errorf("tunnel not set")
-	}
-
-	a, ok := options.Context.Value(tunnelAddr{}).(string)
-	if ok {
-		// initialise address
-		if err := t.Init(tunnel.Address(a)); err != nil {
-			return nil, err
-		}
-	}
-
-	if len(options.Addrs) > 0 {
-		// initialise nodes
-		if err := t.Init(tunnel.Nodes(options.Addrs...)); err != nil {
-			return nil, err
-		}
-	}
-
-	return &tunBroker{
-		opts:   options,
-		tunnel: t,
-	}, nil
-}
-
-// WithAddress sets the tunnel address
-func WithAddress(a string) broker.Option {
-	return func(o *broker.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, tunnelAddr{}, a)
-	}
-}
-
-// WithTunnel sets the internal tunnel
-func WithTunnel(t tunnel.Tunnel) broker.Option {
-	return func(o *broker.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, tunnelKey{}, t)
-	}
-}

network/tunnel/options.go

@@ -1,192 +0,0 @@
-package tunnel
-
-import (
-	"time"
-
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/network/transport"
-	"go.unistack.org/micro/v3/tracer"
-	"go.unistack.org/micro/v3/util/id"
-)
-
-var (
-	// DefaultAddress is default tunnel bind address
-	DefaultAddress = ":0"
-	// DefaultToken the shared default token
-	DefaultToken = "go.micro.tunnel"
-)
-
-// Option func signature
-type Option func(*Options)
-
-// Options provides network configuration options
-type Options struct {
-	// Logger used for logging
-	Logger logger.Logger
-	// Meter used for metrics
-	Meter meter.Meter
-	// Tracer used for tracing
-	Tracer tracer.Tracer
-	// Transport used for communication
-	Transport transport.Transport
-	// Token the shared auth token
-	Token string
-	// Name holds the tunnel name
-	Name string
-	// ID holds the tunnel id
-	ID string
-	// Address holds the tunnel address
-	Address string
-	// Nodes holds the tunnel nodes
-	Nodes []string
-}
-
-// DialOption func
-type DialOption func(*DialOptions)
-
-// DialOptions provides dial options
-type DialOptions struct {
-	// Link specifies the link to use
-	Link string
-	// specify mode of the session
-	Mode Mode
-	// Wait for connection to be accepted
-	Wait bool
-	// the dial timeout
-	Timeout time.Duration
-}
-
-// ListenOption func
-type ListenOption func(*ListenOptions)
-
-// ListenOptions provides listen options
-type ListenOptions struct {
-	// Mode specify mode of the session
-	Mode Mode
-	// Timeout the read timeout
-	Timeout time.Duration
-}
-
-// ID sets the tunnel id
-func ID(id string) Option {
-	return func(o *Options) {
-		o.ID = id
-	}
-}
-
-// Logger sets the logger
-func Logger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
-// Meter sets the meter
-func Meter(m meter.Meter) Option {
-	return func(o *Options) {
-		o.Meter = m
-	}
-}
-
-// Address sets the tunnel address
-func Address(a string) Option {
-	return func(o *Options) {
-		o.Address = a
-	}
-}
-
-// Nodes specify remote network nodes
-func Nodes(n ...string) Option {
-	return func(o *Options) {
-		o.Nodes = n
-	}
-}
-
-// Token sets the shared token for auth
-func Token(t string) Option {
-	return func(o *Options) {
-		o.Token = t
-	}
-}
-
-// Transport listens for incoming connections
-func Transport(t transport.Transport) Option {
-	return func(o *Options) {
-		o.Transport = t
-	}
-}
-
-// ListenMode option
-func ListenMode(m Mode) ListenOption {
-	return func(o *ListenOptions) {
-		o.Mode = m
-	}
-}
-
-// ListenTimeout for reads and writes on the listener session
-func ListenTimeout(t time.Duration) ListenOption {
-	return func(o *ListenOptions) {
-		o.Timeout = t
-	}
-}
-
-// DialMode multicast sets the multicast option to send only to those mapped
-func DialMode(m Mode) DialOption {
-	return func(o *DialOptions) {
-		o.Mode = m
-	}
-}
-
-// DialTimeout sets the dial timeout of the connection
-func DialTimeout(t time.Duration) DialOption {
-	return func(o *DialOptions) {
-		o.Timeout = t
-	}
-}
-
-// DialLink specifies the link to pin this connection to.
-// This is not applicable if the multicast option is set.
-func DialLink(id string) DialOption {
-	return func(o *DialOptions) {
-		o.Link = id
-	}
-}
-
-// DialWait specifies whether to wait for the connection
-// to be accepted before returning the session
-func DialWait(b bool) DialOption {
-	return func(o *DialOptions) {
-		o.Wait = b
-	}
-}
-
-// NewOptions returns router default options with filled values
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		ID:      id.Must(),
-		Address: DefaultAddress,
-		Token:   DefaultToken,
-		Logger:  logger.DefaultLogger,
-		Meter:   meter.DefaultMeter,
-		Tracer:  tracer.DefaultTracer,
-	}
-	for _, o := range opts {
-		o(&options)
-	}
-	return options
-}
-
-// Tracer to be used for tracing
-func Tracer(t tracer.Tracer) Option {
-	return func(o *Options) {
-		o.Tracer = t
-	}
-}
-
-// Name sets the name
-func Name(n string) Option {
-	return func(o *Options) {
-		o.Name = n
-	}
-}

network/tunnel/transport/listener.go

@@ -1,30 +0,0 @@
-package transport
-
-import (
-	"go.unistack.org/micro/v3/network/transport"
-	"go.unistack.org/micro/v3/network/tunnel"
-)
-
-type tunListener struct {
-	l tunnel.Listener
-}
-
-func (t *tunListener) Addr() string {
-	return t.l.Channel()
-}
-
-func (t *tunListener) Close() error {
-	return t.l.Close()
-}
-
-func (t *tunListener) Accept(fn func(socket transport.Socket)) error {
-	for {
-		// accept connection
-		c, err := t.l.Accept()
-		if err != nil {
-			return err
-		}
-		// execute the function
-		go fn(c)
-	}
-}

network/tunnel/transport/transport.go

@@ -1,113 +0,0 @@
-// Package transport provides a tunnel transport
-package transport // import "go.unistack.org/micro/v3/network/tunnel/transport"
-
-import (
-	"context"
-	"fmt"
-
-	"go.unistack.org/micro/v3/network/transport"
-	"go.unistack.org/micro/v3/network/tunnel"
-)
-
-type tunTransport struct {
-	tunnel  tunnel.Tunnel
-	options transport.Options
-}
-
-type tunnelKey struct{}
-
-type transportKey struct{}
-
-func (t *tunTransport) Init(opts ...transport.Option) error {
-	for _, o := range opts {
-		o(&t.options)
-	}
-
-	// close the existing tunnel
-	if t.tunnel != nil {
-		t.tunnel.Close(context.TODO())
-	}
-
-	// get the tunnel
-	tun, ok := t.options.Context.Value(tunnelKey{}).(tunnel.Tunnel)
-	if !ok {
-		return fmt.Errorf("tunnel not set")
-	}
-
-	// get the transport
-	tr, ok := t.options.Context.Value(transportKey{}).(transport.Transport)
-	if ok {
-		_ = tun.Init(tunnel.Transport(tr))
-	}
-
-	// set the tunnel
-	t.tunnel = tun
-
-	return nil
-}
-
-func (t *tunTransport) Dial(ctx context.Context, addr string, opts ...transport.DialOption) (transport.Client, error) {
-	if err := t.tunnel.Connect(ctx); err != nil {
-		return nil, err
-	}
-
-	c, err := t.tunnel.Dial(ctx, addr)
-	if err != nil {
-		return nil, err
-	}
-
-	return c, nil
-}
-
-func (t *tunTransport) Listen(ctx context.Context, addr string, opts ...transport.ListenOption) (transport.Listener, error) {
-	if err := t.tunnel.Connect(ctx); err != nil {
-		return nil, err
-	}
-
-	l, err := t.tunnel.Listen(ctx, addr)
-	if err != nil {
-		return nil, err
-	}
-
-	return &tunListener{l}, nil
-}
-
-func (t *tunTransport) Options() transport.Options {
-	return t.options
-}
-
-func (t *tunTransport) String() string {
-	return "tunnel"
-}
-
-// NewTransport honours the initialiser used in
-func NewTransport(opts ...transport.Option) transport.Transport {
-	t := &tunTransport{
-		options: transport.Options{},
-	}
-
-	// initialise
-	// t.Init(opts...)
-
-	return t
-}
-
-// WithTunnel sets the internal tunnel
-func WithTunnel(t tunnel.Tunnel) transport.Option {
-	return func(o *transport.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, tunnelKey{}, t)
-	}
-}
-
-// WithTransport sets the internal transport
-func WithTransport(t transport.Transport) transport.Option {
-	return func(o *transport.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, transportKey{}, t)
-	}
-}

network/tunnel/tunnel.go

@@ -1,106 +0,0 @@
-// Package tunnel provides gre network tunnelling
-package tunnel // import "go.unistack.org/micro/v3/network/transport/tunnel"
-
-import (
-	"context"
-	"errors"
-	"time"
-
-	"go.unistack.org/micro/v3/network/transport"
-)
-
-// DefaultTunnel contains default tunnel implementation
-var DefaultTunnel Tunnel
-
-const (
-	// Unicast send over one link
-	Unicast Mode = iota
-	// Multicast send to all channel listeners
-	Multicast
-	// Broadcast send to all links
-	Broadcast
-)
-
-var (
-	// DefaultDialTimeout is the dial timeout if none is specified
-	DefaultDialTimeout = time.Second * 5
-	// ErrDialTimeout is returned by a call to Dial where the timeout occurs
-	ErrDialTimeout = errors.New("dial timeout")
-	// ErrDiscoverChan is returned when we failed to receive the "announce" back from a discovery
-	ErrDiscoverChan = errors.New("failed to discover channel")
-	// ErrLinkNotFound is returned when a link is specified at dial time and does not exist
-	ErrLinkNotFound = errors.New("link not found")
-	// ErrLinkDisconnected is returned when a link we attempt to send to is disconnected
-	ErrLinkDisconnected = errors.New("link not connected")
-	// ErrLinkLoopback is returned when attempting to send an outbound message over loopback link
-	ErrLinkLoopback = errors.New("link is loopback")
-	// ErrLinkRemote is returned when attempting to send a loopback message over remote link
-	ErrLinkRemote = errors.New("link is remote")
-	// ErrReadTimeout is a timeout on session.Recv
-	ErrReadTimeout = errors.New("read timeout")
-	// ErrDecryptingData is for when theres a nonce error
-	ErrDecryptingData = errors.New("error decrypting data")
-)
-
-// Mode of the session
-type Mode uint8
-
-// Tunnel creates a gre tunnel on top of the micro/transport.
-// It establishes multiple streams using the Micro-Tunnel-Channel header
-// and Micro-Tunnel-Session header. The tunnel id is a hash of
-// the address being requested.
-type Tunnel interface {
-	// Init initializes tunnel with options
-	Init(opts ...Option) error
-	// Address returns the address the tunnel is listening on
-	Address() string
-	// Connect connects the tunnel
-	Connect(ctx context.Context) error
-	// Close closes the tunnel
-	Close(ctx context.Context) error
-	// Links returns all the links the tunnel is connected to
-	Links() []Link
-	// Dial allows a client to connect to a channel
-	Dial(ctx context.Context, channel string, opts ...DialOption) (Session, error)
-	// Listen allows to accept connections on a channel
-	Listen(ctx context.Context, channel string, opts ...ListenOption) (Listener, error)
-	// String returns the name of the tunnel implementation
-	String() string
-}
-
-// Link represents internal links to the tunnel
-type Link interface {
-	// Id returns the link unique Id
-	Id() string
-	// Delay is the current load on the link (lower is better)
-	Delay() int64
-	// Length returns the roundtrip time as nanoseconds (lower is better)
-	Length() int64
-	// Current transfer rate as bits per second (lower is better)
-	Rate() float64
-	// Is this a loopback link
-	Loopback() bool
-	// State of the link: connected/closed/error
-	State() string
-	// honours transport socket
-	transport.Socket
-}
-
-// Listener provides similar constructs to the transport.Listener
-type Listener interface {
-	Accept() (Session, error)
-	Channel() string
-	Close() error
-}
-
-// Session is a unique session created when dialling or accepting connections on the tunnel
-type Session interface {
-	// The unique session id
-	Id() string
-	// The channel name
-	Channel() string
-	// The link the session is on
-	Link() string
-	// a transport socket
-	transport.Socket
-}

options.go

@@ -5,17 +5,18 @@ import (
 	"fmt"
 	"time"
 
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/config"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/register"
-	"go.unistack.org/micro/v3/router"
-	"go.unistack.org/micro/v3/server"
-	"go.unistack.org/micro/v3/store"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/broker"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/config"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/router"
+	"go.unistack.org/micro/v4/server"
+	"go.unistack.org/micro/v4/store"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options for micro service
@@ -90,33 +91,7 @@ type Option func(*Options) error
 // Broker to be used for client and server
 func Broker(b broker.Broker, opts ...BrokerOption) Option {
 	return func(o *Options) error {
-		var err error
-		bopts := brokerOptions{}
-		for _, opt := range opts {
-			opt(&bopts)
-		}
-		all := false
-		if len(opts) == 0 {
-			all = true
-		}
-		for _, srv := range o.Servers {
-			for _, os := range bopts.servers {
-				if srv.Name() == os || all {
-					if err = srv.Init(server.Broker(b)); err != nil {
-						return err
-					}
-				}
-			}
-		}
-		for _, cli := range o.Clients {
-			for _, oc := range bopts.clients {
-				if cli.Name() == oc || all {
-					if err = cli.Init(client.Broker(b)); err != nil {
-						return err
-					}
-				}
-			}
-		}
+		o.Brokers = []broker.Broker{b}
 		return nil
 	}
 }
@@ -227,7 +202,7 @@ func Logger(l logger.Logger, opts ...LoggerOption) Option {
 		for _, srv := range o.Servers {
 			for _, os := range lopts.servers {
 				if srv.Name() == os || all {
-					if err = srv.Init(server.Logger(l)); err != nil {
+					if err = srv.Init(options.Logger(l)); err != nil {
 						return err
 					}
 				}
@@ -236,7 +211,7 @@ func Logger(l logger.Logger, opts ...LoggerOption) Option {
 		for _, cli := range o.Clients {
 			for _, oc := range lopts.clients {
 				if cli.Name() == oc || all {
-					if err = cli.Init(client.Logger(l)); err != nil {
+					if err = cli.Init(options.Logger(l)); err != nil {
 						return err
 					}
 				}
@@ -245,7 +220,7 @@ func Logger(l logger.Logger, opts ...LoggerOption) Option {
 		for _, brk := range o.Brokers {
 			for _, ob := range lopts.brokers {
 				if brk.Name() == ob || all {
-					if err = brk.Init(broker.Logger(l)); err != nil {
+					if err = brk.Init(options.Logger(l)); err != nil {
 						return err
 					}
 				}
@@ -263,7 +238,7 @@ func Logger(l logger.Logger, opts ...LoggerOption) Option {
 		for _, str := range o.Stores {
 			for _, or := range lopts.stores {
 				if str.Name() == or || all {
-					if err = str.Init(store.Logger(l)); err != nil {
+					if err = str.Init(options.Logger(l)); err != nil {
 						return err
 					}
 				}
@@ -272,7 +247,7 @@ 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 {
+					if err = mtr.Init(options.Logger(l)); err != nil {
 						return err
 					}
 				}
@@ -281,7 +256,7 @@ func Logger(l logger.Logger, opts ...LoggerOption) Option {
 		for _, trc := range o.Tracers {
 			for _, ot := range lopts.tracers {
 				if trc.Name() == ot || all {
-					if err = trc.Init(tracer.Logger(l)); err != nil {
+					if err = trc.Init(options.Logger(l)); err != nil {
 						return err
 					}
 				}
@@ -355,7 +330,7 @@ func Register(r register.Register, opts ...RegisterOption) Option {
 		for _, srv := range o.Servers {
 			for _, os := range ropts.servers {
 				if srv.Name() == os || all {
-					if err = srv.Init(server.Register(r)); err != nil {
+					if err = srv.Init(options.Register(r)); err != nil {
 						return err
 					}
 				}
@@ -364,7 +339,7 @@ func Register(r register.Register, opts ...RegisterOption) Option {
 		for _, brk := range o.Brokers {
 			for _, os := range ropts.brokers {
 				if brk.Name() == os || all {
-					if err = brk.Init(broker.Register(r)); err != nil {
+					if err = brk.Init(options.Register(r)); err != nil {
 						return err
 					}
 				}
@@ -421,7 +396,7 @@ func Tracer(t tracer.Tracer, opts ...TracerOption) Option {
 		for _, srv := range o.Servers {
 			for _, os := range topts.servers {
 				if srv.Name() == os || all {
-					if err = srv.Init(server.Tracer(t)); err != nil {
+					if err = srv.Init(options.Tracer(t)); err != nil {
 						return err
 					}
 				}
@@ -430,7 +405,7 @@ func Tracer(t tracer.Tracer, opts ...TracerOption) Option {
 		for _, cli := range o.Clients {
 			for _, os := range topts.clients {
 				if cli.Name() == os || all {
-					if err = cli.Init(client.Tracer(t)); err != nil {
+					if err = cli.Init(options.Tracer(t)); err != nil {
 						return err
 					}
 				}
@@ -439,7 +414,7 @@ func Tracer(t tracer.Tracer, opts ...TracerOption) Option {
 		for _, str := range o.Stores {
 			for _, os := range topts.stores {
 				if str.Name() == os || all {
-					if err = str.Init(store.Tracer(t)); err != nil {
+					if err = str.Init(options.Tracer(t)); err != nil {
 						return err
 					}
 				}
@@ -448,7 +423,7 @@ func Tracer(t tracer.Tracer, opts ...TracerOption) Option {
 		for _, brk := range o.Brokers {
 			for _, os := range topts.brokers {
 				if brk.Name() == os || all {
-					if err = brk.Init(broker.Tracer(t)); err != nil {
+					if err = brk.Init(options.Tracer(t)); err != nil {
 						return err
 					}
 				}
@@ -547,7 +522,7 @@ func Router(r router.Router, opts ...RouterOption) Option {
 		for _, cli := range o.Clients {
 			for _, os := range ropts.clients {
 				if cli.Name() == os || all {
-					if err = cli.Init(client.Router(r)); err != nil {
+					if err = cli.Init(options.Router(r)); err != nil {
 						return err
 					}
 				}
@@ -582,7 +557,7 @@ func Address(addr string) Option {
 		default:
 			return fmt.Errorf("cant set same address for multiple servers")
 		}
-		return o.Servers[0].Init(server.Address(addr))
+		return o.Servers[0].Init(options.Address(addr))
 	}
 }
 

options/hooks.go

@@ -1,4 +1,4 @@
-package options // import "go.unistack.org/micro/v3/options"
+package options // import "go.unistack.org/micro/v4/options"
 
 // Hook func interface
 type Hook interface{}

options/options.go

@@ -0,0 +1,189 @@
+package options
+
+import (
+	"context"
+	"crypto/tls"
+	"reflect"
+	"time"
+
+	"go.unistack.org/micro/v4/metadata"
+	rutil "go.unistack.org/micro/v4/util/reflect"
+)
+
+// Option func signature
+type Option func(interface{}) error
+
+// Set assign value to struct by its path
+func Set(src interface{}, dst interface{}, path string) error {
+	return rutil.SetFieldByPath(src, dst, path)
+}
+
+// Get returns value from struct by its path
+func Get(src interface{}, path string) (interface{}, error) {
+	return rutil.StructFieldByPath(src, path)
+}
+
+// Name set Name value
+func Name(v ...string) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Name")
+	}
+}
+
+// Address set Address value to single string or slice of strings
+func Address(v ...string) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Address")
+	}
+}
+
+// Broker set Broker value
+func Broker(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Broker")
+	}
+}
+
+// Logger set Logger value
+func Logger(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Logger")
+	}
+}
+
+// Meter set Meter value
+func Meter(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Meter")
+	}
+}
+
+// Tracer set Tracer value
+func Tracer(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Tracer")
+	}
+}
+
+// Store set Store value
+func Store(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Store")
+	}
+}
+
+// Register set Register value
+func Register(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Register")
+	}
+}
+
+// Router set Router value
+func Router(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Router")
+	}
+}
+
+// Codec set Codec value
+func Codec(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Codec")
+	}
+}
+
+// Client set Client value
+func Client(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Client")
+	}
+}
+
+// Codecs to be used to encode/decode requests for a given content type
+func Codecs(ct string, v interface{}) Option {
+	return func(src interface{}) error {
+		cm, err := Get(src, ".Codecs")
+		if err != nil {
+			return err
+		} else if rutil.IsZero(cm) {
+			cm = reflect.MakeMap(reflect.TypeOf(cm)).Interface()
+		}
+		cv := reflect.ValueOf(cm)
+		cv.SetMapIndex(reflect.ValueOf(ct), reflect.ValueOf(v))
+		return Set(src, cv.Interface(), ".Codecs")
+	}
+}
+
+// Context set Context value
+func Context(v context.Context) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Context")
+	}
+}
+
+// TLSConfig set TLSConfig value
+func TLSConfig(v *tls.Config) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".TLSConfig")
+	}
+}
+
+func ContextOption(k, v interface{}) Option {
+	return func(src interface{}) error {
+		ctx, err := Get(src, ".Context")
+		if err != nil {
+			return err
+		}
+		if ctx == nil {
+			ctx = context.Background()
+		}
+		err = Set(src, context.WithValue(ctx.(context.Context), k, v), ".Context")
+		return err
+	}
+}
+
+// ContentType pass ContentType for message data
+func ContentType(ct string) Option {
+	return func(src interface{}) error {
+		return Set(src, ct, ".ContentType")
+	}
+}
+
+// Metadata pass additional metadata
+func Metadata(md metadata.Metadata) Option {
+	return func(src interface{}) error {
+		return Set(src, metadata.Copy(md), ".Metadata")
+	}
+}
+
+// Namespace to use
+func Namespace(ns string) Option {
+	return func(src interface{}) error {
+		return Set(src, ns, ".Namespace")
+	}
+}
+
+// Labels sets the labels
+func Labels(ls ...interface{}) Option {
+	return func(src interface{}) error {
+		v, err := Get(src, ".Labels")
+		if err != nil {
+			return err
+		} else if rutil.IsZero(v) {
+			v = reflect.MakeSlice(reflect.TypeOf(v), 0, len(ls)).Interface()
+		}
+		cv := reflect.ValueOf(v)
+		for _, l := range ls {
+			cv = reflect.Append(cv, reflect.ValueOf(l))
+		}
+		return Set(src, cv.Interface(), ".Labels")
+	}
+}
+
+// Timeout pass timeout time.Duration
+func Timeout(td time.Duration) Option {
+	return func(src interface{}) error {
+		return Set(src, td, ".Timeout")
+	}
+}

options/options_test.go

@@ -0,0 +1,86 @@
+package options_test
+
+import (
+	"testing"
+
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/options"
+)
+
+func TestAddress(t *testing.T) {
+	var err error
+
+	type s struct {
+		Address []string
+	}
+
+	src := &s{}
+	var opts []options.Option
+	opts = append(opts, options.Address("host:port"))
+
+	for _, o := range opts {
+		if err = o(src); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if src.Address[0] != "host:port" {
+		t.Fatal("failed to set Address")
+	}
+}
+
+func TestCodecs(t *testing.T) {
+	var err error
+
+	type s struct {
+		Codecs map[string]codec.Codec
+	}
+
+	src := &s{}
+	var opts []options.Option
+	c := codec.NewCodec()
+	opts = append(opts, options.Codecs("text/html", c))
+
+	for _, o := range opts {
+		if err = o(src); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	for k, v := range src.Codecs {
+		if k != "text/html" || v != c {
+			continue
+		}
+		return
+	}
+
+	t.Fatalf("failed to set Codecs")
+}
+
+func TestLabels(t *testing.T) {
+	type str1 struct {
+		Labels []string
+	}
+	type str2 struct {
+		Labels []interface{}
+	}
+
+	x1 := &str1{}
+
+	if err := options.Labels("one", "two")(x1); err != nil {
+		t.Fatal(err)
+	}
+	if len(x1.Labels) != 2 {
+		t.Fatal("failed to set labels")
+	}
+	x2 := &str2{}
+	if err := options.Labels("key", "val")(x2); err != nil {
+		t.Fatal(err)
+	}
+	if len(x2.Labels) != 2 {
+		t.Fatal("failed to set labels")
+	}
+	if x2.Labels[0] != "key" {
+		t.Fatal("failed to set labels")
+	}
+}

profiler/http/http.go

@@ -1,5 +1,5 @@
 // Package http enables the http profiler
-package http // import "go.unistack.org/micro/v3/profiler/http"
+package http // import "go.unistack.org/micro/v4/profiler/http"
 
 import (
 	"context"
@@ -7,7 +7,7 @@ import (
 	"net/http/pprof"
 	"sync"
 
-	profile "go.unistack.org/micro/v3/profiler"
+	profile "go.unistack.org/micro/v4/profiler"
 )
 
 type httpProfile struct {

profiler/pprof/pprof.go

@@ -1,5 +1,5 @@
 // Package pprof provides a pprof profiler which writes output to /tmp/[name].{cpu,mem}.pprof
-package pprof // import "go.unistack.org/micro/v3/profiler/pprof"
+package pprof // import "go.unistack.org/micro/v4/profiler/pprof"
 
 import (
 	"os"
@@ -9,7 +9,7 @@ import (
 	"sync"
 	"time"
 
-	profile "go.unistack.org/micro/v3/profiler"
+	profile "go.unistack.org/micro/v4/profiler"
 )
 
 type profiler struct {

profiler/profile.go

@@ -1,5 +1,5 @@
 // Package profiler is for profilers
-package profiler // import "go.unistack.org/micro/v3/profiler"
+package profiler // import "go.unistack.org/micro/v4/profiler"
 
 // Profiler interface
 type Profiler interface {

proxy/options.go

@@ -1,98 +0,0 @@
-// Package proxy is a transparent proxy built on the micro/server
-package proxy
-
-import (
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/router"
-	"go.unistack.org/micro/v3/tracer"
-)
-
-// Options for proxy
-type Options struct {
-	// Tracer used for tracing
-	Tracer tracer.Tracer
-	// Client for communication
-	Client client.Client
-	// Router for routing
-	Router router.Router
-	// Logger used for logging
-	Logger logger.Logger
-	// Meter used for metrics
-	Meter meter.Meter
-	// Links holds the communication links
-	Links map[string]client.Client
-	// Endpoint holds the destination address
-	Endpoint string
-}
-
-// Option func signature
-type Option func(o *Options)
-
-// NewOptions returns new options struct that filled by opts
-func NewOptions(opts ...Option) Options {
-	options := Options{
-		Logger: logger.DefaultLogger,
-		Meter:  meter.DefaultMeter,
-		Tracer: tracer.DefaultTracer,
-	}
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	return options
-}
-
-// WithEndpoint sets a proxy endpoint
-func WithEndpoint(e string) Option {
-	return func(o *Options) {
-		o.Endpoint = e
-	}
-}
-
-// WithClient sets the client
-func WithClient(c client.Client) Option {
-	return func(o *Options) {
-		o.Client = c
-	}
-}
-
-// WithRouter specifies the router to use
-func WithRouter(r router.Router) Option {
-	return func(o *Options) {
-		o.Router = r
-	}
-}
-
-// WithLogger specifies the logger to use
-func WithLogger(l logger.Logger) Option {
-	return func(o *Options) {
-		o.Logger = l
-	}
-}
-
-// WithMeter specifies the meter to use
-func WithMeter(m meter.Meter) Option {
-	return func(o *Options) {
-		o.Meter = m
-	}
-}
-
-// WithLink sets a link for outbound requests
-func WithLink(name string, c client.Client) Option {
-	return func(o *Options) {
-		if o.Links == nil {
-			o.Links = make(map[string]client.Client)
-		}
-		o.Links[name] = c
-	}
-}
-
-// Tracer to be used for tracing
-func Tracer(t tracer.Tracer) Option {
-	return func(o *Options) {
-		o.Tracer = t
-	}
-}

proxy/proxy.go

@@ -1,21 +0,0 @@
-// Package proxy is a transparent proxy built on the micro/server
-package proxy // import "go.unistack.org/micro/v3/proxy"
-
-import (
-	"context"
-
-	"go.unistack.org/micro/v3/server"
-)
-
-// DefaultEndpoint holds default proxy address
-var DefaultEndpoint = "localhost:9090"
-
-// Proxy can be used as a proxy server for micro services
-type Proxy interface {
-	// ProcessMessage handles inbound messages
-	ProcessMessage(context.Context, server.Message) error
-	// ServeRequest handles inbound requests
-	ServeRequest(context.Context, server.Request, server.Response) error
-	// Name of the proxy protocol
-	String() string
-}

register/extractor.go

@@ -6,7 +6,7 @@ import (
 	"unicode"
 	"unicode/utf8"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 // ExtractValue from reflect.Type from specified depth

register/memory.go

@@ -5,8 +5,8 @@ import (
 	"sync"
 	"time"
 
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/util/id"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/util/id"
 )
 
 var (

register/options.go

@@ -5,9 +5,9 @@ import (
 	"crypto/tls"
 	"time"
 
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options holds options for register

register/register.go

@@ -1,11 +1,11 @@
 // Package register is an interface for service discovery
-package register // import "go.unistack.org/micro/v3/register"
+package register // import "go.unistack.org/micro/v4/register"
 
 import (
 	"context"
 	"errors"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 const (

resolver/dns/dns.go

@@ -1,5 +1,5 @@
 // Package dns resolves names to dns records
-package dns // import "go.unistack.org/micro/v3/resolver/dns"
+package dns // import "go.unistack.org/micro/v4/resolver/dns"
 
 import (
 	"context"
@@ -7,7 +7,7 @@ import (
 	"sync"
 	"time"
 
-	"go.unistack.org/micro/v3/resolver"
+	"go.unistack.org/micro/v4/resolver"
 )
 
 // Resolver is a DNS network resolve

resolver/dnssrv/dnssrv.go

@@ -1,11 +1,11 @@
 // Package dnssrv resolves names to dns srv records
-package dnssrv // import "go.unistack.org/micro/v3/resolver/dnssrv"
+package dnssrv // import "go.unistack.org/micro/v4/resolver/dnssrv"
 
 import (
 	"fmt"
 	"net"
 
-	"go.unistack.org/micro/v3/resolver"
+	"go.unistack.org/micro/v4/resolver"
 )
 
 // Resolver is a DNS network resolve

resolver/http/http.go

@@ -1,5 +1,5 @@
 // Package http resolves names to network addresses using a http request
-package http // import "go.unistack.org/micro/v3/resolver/http"
+package http // import "go.unistack.org/micro/v4/resolver/http"
 
 import (
 	"encoding/json"
@@ -8,7 +8,7 @@ import (
 	"net/http"
 	"net/url"
 
-	"go.unistack.org/micro/v3/resolver"
+	"go.unistack.org/micro/v4/resolver"
 )
 
 // nolint: golint,revive

resolver/noop/noop.go

@@ -1,8 +1,8 @@
 // Package noop is a noop resolver
-package noop // import "go.unistack.org/micro/v3/resolver/noop"
+package noop // import "go.unistack.org/micro/v4/resolver/noop"
 
 import (
-	"go.unistack.org/micro/v3/resolver"
+	"go.unistack.org/micro/v4/resolver"
 )
 
 // Resolver contains noop resolver

resolver/registry/registry.go

@@ -1,11 +1,11 @@
 // Package register resolves names using the micro register
-package register // import "go.unistack.org/micro/v3/resolver/registry"
+package register // import "go.unistack.org/micro/v4/resolver/registry"
 
 import (
 	"context"
 
-	"go.unistack.org/micro/v3/register"
-	"go.unistack.org/micro/v3/resolver"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/resolver"
 )
 
 // Resolver is a register network resolver

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 // import "go.unistack.org/micro/v4/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().

resolver/static/static.go

@@ -1,8 +1,8 @@
 // Package static is a static resolver
-package static // import "go.unistack.org/micro/v3/resolver/static"
+package static // import "go.unistack.org/micro/v4/resolver/static"
 
 import (
-	"go.unistack.org/micro/v3/resolver"
+	"go.unistack.org/micro/v4/resolver"
 )
 
 // Resolver returns a static list of nodes. In the event the node list

router/options.go

@@ -3,9 +3,9 @@ package router
 import (
 	"context"
 
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/register"
-	"go.unistack.org/micro/v3/util/id"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/util/id"
 )
 
 // Options are router options

router/route.go

@@ -3,7 +3,7 @@ package router
 import (
 	"hash/fnv"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 var (

router/router.go

@@ -1,5 +1,5 @@
 // Package router provides a network routing control plane
-package router // import "go.unistack.org/micro/v3/router"
+package router // import "go.unistack.org/micro/v4/router"
 
 import (
 	"errors"

selector/random/random.go

@@ -1,8 +1,8 @@
-package random // import "go.unistack.org/micro/v3/selector/random"
+package random // import "go.unistack.org/micro/v4/selector/random"
 
 import (
-	"go.unistack.org/micro/v3/selector"
-	"go.unistack.org/micro/v3/util/rand"
+	"go.unistack.org/micro/v4/selector"
+	"go.unistack.org/micro/v4/util/rand"
 )
 
 type random struct{}

selector/random/random_test.go

@@ -3,7 +3,7 @@ package random
 import (
 	"testing"
 
-	"go.unistack.org/micro/v3/selector"
+	"go.unistack.org/micro/v4/selector"
 )
 
 func TestRandom(t *testing.T) {

selector/roundrobin/roundrobin.go

@@ -1,8 +1,8 @@
-package roundrobin // import "go.unistack.org/micro/v3/selector/roundrobin"
+package roundrobin // import "go.unistack.org/micro/v4/selector/roundrobin"
 
 import (
-	"go.unistack.org/micro/v3/selector"
-	"go.unistack.org/micro/v3/util/rand"
+	"go.unistack.org/micro/v4/selector"
+	"go.unistack.org/micro/v4/util/rand"
 )
 
 // NewSelector returns an initialised round robin selector

selector/roundrobin/roundrobin_test.go

@@ -3,7 +3,7 @@ package roundrobin
 import (
 	"testing"
 
-	"go.unistack.org/micro/v3/selector"
+	"go.unistack.org/micro/v4/selector"
 )
 
 func TestRoundRobin(t *testing.T) {

selector/selector.go

@@ -1,5 +1,5 @@
 // Package selector is for node selection and load balancing
-package selector // import "go.unistack.org/micro/v3/selector"
+package selector // import "go.unistack.org/micro/v4/selector"
 
 import (
 	"errors"

semconv/broker.go

@@ -0,0 +1,20 @@
+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"
+)

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"
+)