move to v4

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

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

@@ -1,12 +1,12 @@
 // 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/codec"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 // DefaultBroker default memory broker

broker/memory.go

@@ -4,12 +4,12 @@ import (
 	"context"
 	"sync"
 
-	"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/logger"
+	"go.unistack.org/micro/v4/metadata"
+	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 {

broker/memory_test.go

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

broker/options.go

@@ -5,11 +5,11 @@ 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/meter"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options struct

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/metadata"
 )
 
 var (

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

@@ -3,14 +3,13 @@ package client
 import (
 	"context"
 	"fmt"
-	"os"
 	"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/broker"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/selector"
 )
 
 // DefaultCodecs will be used to encode/decode data
@@ -486,34 +485,21 @@ func (n *noopClient) publish(ctx context.Context, ps []Message, opts ...PublishO
 
 	msgs := make([]*broker.Message, 0, len(ps))
 
-	// get proxy
-	exchange := ""
-	if v, ok := os.LookupEnv("MICRO_PROXY"); ok {
-		exchange = v
-	}
-	// get the exchange
-	if len(options.Exchange) > 0 {
-		exchange = options.Exchange
-	}
-
-	omd, ok := metadata.FromOutgoingContext(ctx)
-	if !ok {
-		omd = metadata.New(0)
-	}
-
 	for _, p := range ps {
-		md := metadata.Copy(omd)
+		md, ok := metadata.FromOutgoingContext(ctx)
+		if !ok {
+			md = metadata.New(0)
+		}
 		md[metadata.HeaderContentType] = p.ContentType()
+
 		topic := p.Topic()
-		if len(exchange) > 0 {
-			topic = exchange
+
+		// get the exchange
+		if len(options.Exchange) > 0 {
+			topic = options.Exchange
 		}
+
 		md[metadata.HeaderTopic] = topic
-		iter := p.Metadata().Iterator()
-		var k, v string
-		for iter.Next(&k, &v) {
-			md.Set(k, v)
-		}
 
 		var body []byte
 

client/options.go

@@ -6,17 +6,17 @@ 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/broker"
+	"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/network/transport"
+	"go.unistack.org/micro/v4/register"
+	"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

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

@@ -1,5 +1,5 @@
 // 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"

config/default.go

@@ -7,11 +7,9 @@ import (
 	"strings"
 	"time"
 
-	"github.com/google/uuid"
 	"github.com/imdario/mergo"
-	mid "go.unistack.org/micro/v3/util/id"
-	rutil "go.unistack.org/micro/v3/util/reflect"
-	mtime "go.unistack.org/micro/v3/util/time"
+	rutil "go.unistack.org/micro/v4/util/reflect"
+	mtime "go.unistack.org/micro/v4/util/time"
 )
 
 type defaultConfig struct {
@@ -39,10 +37,6 @@ func (c *defaultConfig) Init(opts ...Option) error {
 }
 
 func (c *defaultConfig) Load(ctx context.Context, opts ...LoadOption) error {
-	if c.opts.SkipLoad != nil && c.opts.SkipLoad(ctx, c) {
-		return nil
-	}
-
 	if err := DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
 		return err
 	}
@@ -130,20 +124,6 @@ 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)
@@ -189,7 +169,7 @@ 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
@@ -295,11 +275,7 @@ func fillValues(valueOf reflect.Value, tname string) error {
 	return nil
 }
 
-func (c *defaultConfig) Save(ctx context.Context, _ ...SaveOption) error {
-	if c.opts.SkipSave != nil && c.opts.SkipSave(ctx, c) {
-		return nil
-	}
-
+func (c *defaultConfig) Save(ctx context.Context, opts ...SaveOption) error {
 	if err := DefaultBeforeSave(ctx, c); err != nil {
 		return err
 	}

config/default_test.go

@@ -6,21 +6,17 @@ import (
 	"testing"
 	"time"
 
-	"go.unistack.org/micro/v3/config"
-	mid "go.unistack.org/micro/v3/util/id"
-	mtime "go.unistack.org/micro/v3/util/time"
+	"go.unistack.org/micro/v4/config"
+	mtime "go.unistack.org/micro/v4/util/time"
 )
 
 type cfg struct {
 	StringValue    string `default:"string_value"`
 	IgnoreValue    string `json:"-"`
 	StructValue    *cfgStructValue
-	IntValue       int             `default:"99"`
-	DurationValue  time.Duration   `default:"10s"`
-	MDurationValue mtime.Duration  `default:"10s"`
-	MapValue       map[string]bool `default:"key1=true,key2=false"`
-	UUIDValue      string          `default:"micro:generate uuid"`
-	IDValue        string          `default:"micro:generate id"`
+	IntValue       int            `default:"99"`
+	DurationValue  time.Duration  `default:"10s"`
+	MDurationValue mtime.Duration `default:"10s"`
 }
 
 type cfgStructValue struct {
@@ -71,21 +67,6 @@ 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 +4,10 @@ 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/tracer"
 )
 
 // Options hold the config options
@@ -42,10 +42,6 @@ type Options struct {
 	AfterInit []func(context.Context, Config) error
 	// AllowFail flag to allow fail in config source
 	AllowFail bool
-	// SkipLoad runs only if condition returns true
-	SkipLoad func(context.Context, Config) bool
-	// SkipSave runs only if condition returns true
-	SkipSave func(context.Context, Config) bool
 }
 
 // Option function signature
@@ -72,9 +68,9 @@ type LoadOption func(o *LoadOptions)
 // LoadOptions struct
 type LoadOptions struct {
 	Struct   interface{}
-	Context  context.Context
 	Override bool
 	Append   bool
+	Context  context.Context
 }
 
 // NewLoadOptions create LoadOptions struct with provided opts

database/dsn.go

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

database/dsn_test.go

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

errors/errors.go

@@ -1,20 +1,14 @@
 // Package errors provides a way to return detailed information
 // for an RPC request error. The error is normally JSON encoded.
-package errors // import "go.unistack.org/micro/v3/errors"
+package errors // import "go.unistack.org/micro/v4/errors"
 
 import (
 	"bytes"
-	"context"
 	"encoding/json"
-	"errors"
 	"fmt"
-	"io"
 	"net/http"
 	"strconv"
 	"strings"
-
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
 )
 
 var (
@@ -346,135 +340,3 @@ func addslashes(str string) string {
 	}
 	return buf.String()
 }
-
-type retryableError struct {
-	err error
-}
-
-// Retryable returns error that can be retried later
-func Retryable(err error) error {
-	return &retryableError{err: err}
-}
-
-type IsRetryableFunc func(error) bool
-
-var (
-	RetrayableOracleErrors = []IsRetryableFunc{
-		func(err error) bool {
-			errmsg := err.Error()
-			switch {
-			case strings.Contains(errmsg, `ORA-`):
-				return true
-			case strings.Contains(errmsg, `can not assign`):
-				return true
-			case strings.Contains(errmsg, `can't assign`):
-				return true
-			}
-			return false
-		},
-	}
-	RetrayablePostgresErrors = []IsRetryableFunc{
-		func(err error) bool {
-			errmsg := err.Error()
-			switch {
-			case strings.Contains(errmsg, `number of field descriptions must equal number of`):
-				return true
-			case strings.Contains(errmsg, `not a pointer`):
-				return true
-			case strings.Contains(errmsg, `values, but dst struct has only`):
-				return true
-			case strings.Contains(errmsg, `struct doesn't have corresponding row field`):
-				return true
-			case strings.Contains(errmsg, `cannot find field`):
-				return true
-			case strings.Contains(errmsg, `cannot scan`) || strings.Contains(errmsg, `cannot convert`):
-				return true
-			case strings.Contains(errmsg, `failed to connect to`):
-				return true
-			}
-			return false
-		},
-	}
-	RetryableMicroErrors = []IsRetryableFunc{
-		func(err error) bool {
-			switch verr := err.(type) {
-			case *Error:
-				switch verr.Code {
-				case 401, 403, 408, 500, 501, 502, 503, 504:
-					return true
-				default:
-					return false
-				}
-			case *retryableError:
-				return true
-			}
-			return false
-		},
-	}
-	RetryableGoErrors = []IsRetryableFunc{
-		func(err error) bool {
-			switch verr := err.(type) {
-			case interface{ SafeToRetry() bool }:
-				return verr.SafeToRetry()
-			case interface{ Timeout() bool }:
-				return verr.Timeout()
-			}
-			switch {
-			case errors.Is(err, io.EOF), errors.Is(err, io.ErrUnexpectedEOF):
-				return true
-			case errors.Is(err, context.DeadlineExceeded):
-				return true
-			case errors.Is(err, io.ErrClosedPipe), errors.Is(err, io.ErrShortBuffer), errors.Is(err, io.ErrShortWrite):
-				return true
-			}
-			return false
-		},
-	}
-	RetryableGrpcErrors = []IsRetryableFunc{
-		func(err error) bool {
-			st, ok := status.FromError(err)
-			if !ok {
-				return false
-			}
-			switch st.Code() {
-			case codes.Unavailable, codes.ResourceExhausted:
-				return true
-			case codes.DeadlineExceeded:
-				return true
-			case codes.Internal:
-				switch {
-				case strings.Contains(st.Message(), `transport: received the unexpected content-type "text/html; charset=UTF-8"`):
-					return true
-				case strings.Contains(st.Message(), io.ErrUnexpectedEOF.Error()):
-					return true
-				case strings.Contains(st.Message(), `stream terminated by RST_STREAM with error code: INTERNAL_ERROR`):
-					return true
-				}
-			}
-			return false
-		},
-	}
-)
-
-// Unwrap provides error wrapping
-func (e *retryableError) Unwrap() error {
-	return e.err
-}
-
-// Error returns the error string
-func (e *retryableError) Error() string {
-	if e.err == nil {
-		return ""
-	}
-	return e.err.Error()
-}
-
-// IsRetryable checks error for ability to retry later
-func IsRetryable(err error, fns ...IsRetryableFunc) bool {
-	for _, fn := range fns {
-		if ok := fn(err); ok {
-			return true
-		}
-	}
-	return false
-}

errors/errors.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";

errors/errors_test.go

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

event.go

@@ -3,7 +3,7 @@ package micro
 import (
 	"context"
 
-	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v4/client"
 )
 
 // Event is used to publish messages to a topic

flow/default.go

@@ -6,12 +6,12 @@ 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/store"
+	"go.unistack.org/micro/v4/util/id"
 )
 
 type microFlow struct {

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 +7,7 @@ import (
 	"sync"
 	"sync/atomic"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 var (

flow/options.go

@@ -4,11 +4,11 @@ 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/store"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Option func

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

@@ -1,20 +1,10 @@
-module go.unistack.org/micro/v3
+module go.unistack.org/micro/v4
 
-go 1.19
+go 1.20
 
 require (
 	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/imdario/mergo v0.3.14
 	github.com/patrickmn/go-cache v2.1.0+incompatible
-	github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5
-	golang.org/x/sync v0.3.0
-	google.golang.org/grpc v1.57.0
-	google.golang.org/protobuf v1.31.0
-)
-
-require (
-	github.com/golang/protobuf v1.5.3 // indirect
-	golang.org/x/net v0.14.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20230526203410-71b5a4ffd15e // indirect
+	github.com/silas/dag v0.0.0-20211117232152-9d50aa809f35
 )

go.sum

@@ -1,33 +1,11 @@
 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/imdario/mergo v0.3.14 h1:fOqeC1+nCuuk6PKQdg9YmosXX7Y7mHX6R/0ZldI9iHo=
+github.com/imdario/mergo v0.3.14/go.mod h1:WBLT9ZmE3lPoWsEzCh9LPo3TiwVN+ZKEjmz+hD27ysY=
 github.com/patrickmn/go-cache v2.1.0+incompatible h1:HRMgzkcYKYpi3C8ajMPV8OFXaaRUnok+kx1WdO15EQc=
 github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
-github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5 h1:G/FZtUu7a6NTWl3KUHMV9jkLAh/Rvtf03NWMHaEDl+E=
-github.com/silas/dag v0.0.0-20220518035006-a7e85ada93c5/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
-golang.org/x/net v0.14.0 h1:BONx9s002vGdD9umnlX1Po8vOZmrgH34qlHcD1MfK14=
-golang.org/x/net v0.14.0/go.mod h1:PpSgVXXLK0OxS0F31C1/tv6XNguvCrnXIDrFMspZIUI=
-golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
-golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
-golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
-golang.org/x/text v0.12.0 h1:k+n5B8goJNdU7hSvEtMUz3d1Q6D/XW4COJSJR6fN0mc=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230526203410-71b5a4ffd15e h1:NumxXLPfHSndr3wBBdeKiVHjGVFzi9RX2HwwQke94iY=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230526203410-71b5a4ffd15e/go.mod h1:66JfowdXAEgad5O9NnYcsNPLCPZJD++2L9X0PCMODrA=
-google.golang.org/grpc v1.57.0 h1:kfzNeI/klCGD2YPMUlaGNT3pxvYfga7smW3Vth8Zsiw=
-google.golang.org/grpc v1.57.0/go.mod h1:Sd+9RMTACXwmub0zcNY2c4arhtrbBYD1AUHI/dt16Mo=
-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 v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+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=
 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/default.go

@@ -0,0 +1,230 @@
+package logger
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"runtime"
+	"strings"
+	"sync"
+	"time"
+)
+
+type defaultLogger struct {
+	enc  *json.Encoder
+	opts Options
+	sync.RWMutex
+}
+
+// Init(opts...) should only overwrite provided options
+func (l *defaultLogger) Init(opts ...Option) error {
+	l.Lock()
+	for _, o := range opts {
+		o(&l.opts)
+	}
+	l.enc = json.NewEncoder(l.opts.Out)
+	// wrap the Log func
+	l.Unlock()
+	return nil
+}
+
+func (l *defaultLogger) String() string {
+	return "micro"
+}
+
+func (l *defaultLogger) Clone(opts ...Option) Logger {
+	newopts := NewOptions(opts...)
+	oldopts := l.opts
+	for _, o := range opts {
+		o(&newopts)
+		o(&oldopts)
+	}
+
+	l.Lock()
+	cl := &defaultLogger{opts: oldopts, enc: json.NewEncoder(l.opts.Out)}
+	l.Unlock()
+
+	return cl
+}
+
+func (l *defaultLogger) V(level Level) bool {
+	l.RLock()
+	ok := l.opts.Level.Enabled(level)
+	l.RUnlock()
+	return ok
+}
+
+func (l *defaultLogger) Level(level Level) {
+	l.Lock()
+	l.opts.Level = level
+	l.Unlock()
+}
+
+func (l *defaultLogger) Fields(fields ...interface{}) Logger {
+	l.RLock()
+	nl := &defaultLogger{opts: l.opts, enc: l.enc}
+	if len(fields) == 0 {
+		l.RUnlock()
+		return nl
+	} else if len(fields)%2 != 0 {
+		fields = fields[:len(fields)-1]
+	}
+	nl.opts.Fields = copyFields(l.opts.Fields)
+	nl.opts.Fields = append(nl.opts.Fields, fields...)
+	l.RUnlock()
+	return nl
+}
+
+func copyFields(src []interface{}) []interface{} {
+	dst := make([]interface{}, len(src))
+	copy(dst, src)
+	return dst
+}
+
+// logCallerfilePath returns a package/file:line description of the caller,
+// preserving only the leaf directory name and file name.
+func logCallerfilePath(loggingFilePath string) string {
+	// To make sure we trim the path correctly on Windows too, we
+	// counter-intuitively need to use '/' and *not* os.PathSeparator here,
+	// because the path given originates from Go stdlib, specifically
+	// runtime.Caller() which (as of Mar/17) returns forward slashes even on
+	// Windows.
+	//
+	// See https://github.com/golang/go/issues/3335
+	// and https://github.com/golang/go/issues/18151
+	//
+	// for discussion on the issue on Go side.
+	idx := strings.LastIndexByte(loggingFilePath, '/')
+	if idx == -1 {
+		return loggingFilePath
+	}
+	idx = strings.LastIndexByte(loggingFilePath[:idx], '/')
+	if idx == -1 {
+		return loggingFilePath
+	}
+	return loggingFilePath[idx+1:]
+}
+
+func (l *defaultLogger) Info(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, InfoLevel, args...)
+}
+
+func (l *defaultLogger) Error(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, ErrorLevel, args...)
+}
+
+func (l *defaultLogger) Debug(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, DebugLevel, args...)
+}
+
+func (l *defaultLogger) Warn(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, WarnLevel, args...)
+}
+
+func (l *defaultLogger) Trace(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, TraceLevel, args...)
+}
+
+func (l *defaultLogger) Fatal(ctx context.Context, args ...interface{}) {
+	l.Log(ctx, FatalLevel, args...)
+	os.Exit(1)
+}
+
+func (l *defaultLogger) Infof(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, InfoLevel, msg, args...)
+}
+
+func (l *defaultLogger) Errorf(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, ErrorLevel, msg, args...)
+}
+
+func (l *defaultLogger) Debugf(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, DebugLevel, msg, args...)
+}
+
+func (l *defaultLogger) Warnf(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, WarnLevel, msg, args...)
+}
+
+func (l *defaultLogger) Tracef(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, TraceLevel, msg, args...)
+}
+
+func (l *defaultLogger) Fatalf(ctx context.Context, msg string, args ...interface{}) {
+	l.Logf(ctx, FatalLevel, msg, args...)
+	os.Exit(1)
+}
+
+func (l *defaultLogger) Log(ctx context.Context, level Level, args ...interface{}) {
+	if !l.V(level) {
+		return
+	}
+
+	l.RLock()
+	fields := copyFields(l.opts.Fields)
+	l.RUnlock()
+
+	fields = append(fields, "level", level.String())
+
+	if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
+		fields = append(fields, "caller", fmt.Sprintf("%s:%d", logCallerfilePath(file), line))
+	}
+	fields = append(fields, "timestamp", time.Now().Format("2006-01-02 15:04:05"))
+
+	if len(args) > 0 {
+		fields = append(fields, "msg", fmt.Sprint(args...))
+	}
+
+	out := make(map[string]interface{}, len(fields)/2)
+	for i := 0; i < len(fields); i += 2 {
+		out[fields[i].(string)] = fields[i+1]
+	}
+	l.RLock()
+	_ = l.enc.Encode(out)
+	l.RUnlock()
+}
+
+func (l *defaultLogger) Logf(ctx context.Context, level Level, msg string, args ...interface{}) {
+	if !l.V(level) {
+		return
+	}
+
+	l.RLock()
+	fields := copyFields(l.opts.Fields)
+	l.RUnlock()
+
+	fields = append(fields, "level", level.String())
+
+	if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
+		fields = append(fields, "caller", fmt.Sprintf("%s:%d", logCallerfilePath(file), line))
+	}
+
+	fields = append(fields, "timestamp", time.Now().Format("2006-01-02 15:04:05"))
+	if len(args) > 0 {
+		fields = append(fields, "msg", fmt.Sprintf(msg, args...))
+	} else if msg != "" {
+		fields = append(fields, "msg", msg)
+	}
+
+	out := make(map[string]interface{}, len(fields)/2)
+	for i := 0; i < len(fields); i += 2 {
+		out[fields[i].(string)] = fields[i+1]
+	}
+	l.RLock()
+	_ = l.enc.Encode(out)
+	l.RUnlock()
+}
+
+func (l *defaultLogger) Options() Options {
+	return l.opts
+}
+
+// NewLogger builds a new logger based on options
+func NewLogger(opts ...Option) Logger {
+	l := &defaultLogger{
+		opts: NewOptions(opts...),
+	}
+	l.enc = json.NewEncoder(l.opts.Out)
+	return l
+}

logger/logger.go

@@ -1,5 +1,5 @@
 // Package logger provides a log interface
-package logger // import "go.unistack.org/micro/v3/logger"
+package logger // import "go.unistack.org/micro/v4/logger"
 
 import (
 	"context"

logger/logger_test.go

@@ -1,23 +1,21 @@
-package slog
+package logger
 
 import (
 	"bytes"
 	"context"
 	"log"
 	"testing"
-
-	"go.unistack.org/micro/v3/logger"
 )
 
 func TestContext(t *testing.T) {
 	ctx := context.TODO()
 	buf := bytes.NewBuffer(nil)
-	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
 	if err := l.Init(); err != nil {
 		t.Fatal(err)
 	}
 
-	nl, ok := logger.FromContext(logger.NewContext(ctx, l.Fields("key", "val")))
+	nl, ok := FromContext(NewContext(ctx, l.Fields("key", "val")))
 	if !ok {
 		t.Fatal("context without logger")
 	}
@@ -30,7 +28,7 @@ func TestContext(t *testing.T) {
 func TestFields(t *testing.T) {
 	ctx := context.TODO()
 	buf := bytes.NewBuffer(nil)
-	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
 	if err := l.Init(); err != nil {
 		t.Fatal(err)
 	}
@@ -47,15 +45,15 @@ func TestFromContextWithFields(t *testing.T) {
 	ctx := context.TODO()
 	buf := bytes.NewBuffer(nil)
 	var ok bool
-	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
 	if err := l.Init(); err != nil {
 		t.Fatal(err)
 	}
 	nl := l.Fields("key", "val")
 
-	ctx = logger.NewContext(ctx, nl)
+	ctx = NewContext(ctx, nl)
 
-	l, ok = logger.FromContext(ctx)
+	l, ok = FromContext(ctx)
 	if !ok {
 		t.Fatalf("context does not have logger")
 	}
@@ -69,11 +67,11 @@ func TestFromContextWithFields(t *testing.T) {
 func TestClone(t *testing.T) {
 	ctx := context.TODO()
 	buf := bytes.NewBuffer(nil)
-	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
 	if err := l.Init(); err != nil {
 		t.Fatal(err)
 	}
-	nl := l.Clone(logger.WithLevel(logger.ErrorLevel))
+	nl := l.Clone(WithLevel(ErrorLevel))
 	if err := nl.Init(); err != nil {
 		t.Fatal(err)
 	}
@@ -89,27 +87,27 @@ func TestClone(t *testing.T) {
 
 func TestRedirectStdLogger(t *testing.T) {
 	buf := bytes.NewBuffer(nil)
-	l := NewLogger(logger.WithLevel(logger.ErrorLevel), logger.WithOutput(buf))
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
 	if err := l.Init(); err != nil {
 		t.Fatal(err)
 	}
-	fn := logger.RedirectStdLogger(l, logger.ErrorLevel)
+	fn := RedirectStdLogger(l, ErrorLevel)
 	defer fn()
 	log.Print("test")
-	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"error"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"test"`))) {
+	if !bytes.Contains(buf.Bytes(), []byte(`"level":"error","msg":"test","timestamp"`)) {
 		t.Fatalf("logger error, buf %s", buf.Bytes())
 	}
 }
 
 func TestStdLogger(t *testing.T) {
 	buf := bytes.NewBuffer(nil)
-	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
 	if err := l.Init(); err != nil {
 		t.Fatal(err)
 	}
-	lg := logger.NewStdLogger(l, logger.ErrorLevel)
+	lg := NewStdLogger(l, ErrorLevel)
 	lg.Print("test")
-	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"error"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"test"`))) {
+	if !bytes.Contains(buf.Bytes(), []byte(`"level":"error","msg":"test","timestamp"`)) {
 		t.Fatalf("logger error, buf %s", buf.Bytes())
 	}
 }
@@ -117,25 +115,24 @@ func TestStdLogger(t *testing.T) {
 func TestLogger(t *testing.T) {
 	ctx := context.TODO()
 	buf := bytes.NewBuffer(nil)
-	l := NewLogger(logger.WithLevel(logger.TraceLevel), logger.WithOutput(buf))
+	l := NewLogger(WithLevel(TraceLevel), WithOutput(buf))
 	if err := l.Init(); err != nil {
 		t.Fatal(err)
 	}
 	l.Trace(ctx, "trace_msg1")
 	l.Warn(ctx, "warn_msg1")
 	l.Fields("error", "test").Info(ctx, "error message")
-	l.Warn(ctx, "first second")
-
-	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"trace"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"trace_msg1"`))) {
-		t.Fatalf("logger tracer, buf %s", buf.Bytes())
+	l.Warn(ctx, "first", " ", "second")
+	if !bytes.Contains(buf.Bytes(), []byte(`"level":"trace","msg":"trace_msg1"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
 	}
-	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"warn"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"warn_msg1"`))) {
-		t.Fatalf("logger warn, buf %s", buf.Bytes())
+	if !bytes.Contains(buf.Bytes(), []byte(`"warn","msg":"warn_msg1"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
 	}
-	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"info"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"error message","error":"test"`))) {
-		t.Fatalf("logger info, buf %s", buf.Bytes())
+	if !bytes.Contains(buf.Bytes(), []byte(`"error":"test","level":"info","msg":"error message"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
 	}
-	if !(bytes.Contains(buf.Bytes(), []byte(`"level":"warn"`)) && bytes.Contains(buf.Bytes(), []byte(`"msg":"first second"`))) {
-		t.Fatalf("logger warn, buf %s", buf.Bytes())
+	if !bytes.Contains(buf.Bytes(), []byte(`"level":"warn","msg":"first second"`)) {
+		t.Fatalf("logger error, buf %s", buf.Bytes())
 	}
 }

logger/noop.go

@@ -1,90 +0,0 @@
-package logger
-
-import (
-	"context"
-)
-
-type noopLogger struct {
-	opts Options
-}
-
-func NewLogger(opts ...Option) Logger {
-	options := NewOptions(opts...)
-	return &noopLogger{opts: options}
-}
-
-func (l *noopLogger) V(lvl Level) bool {
-	return false
-}
-
-func (l *noopLogger) Level(lvl Level) {
-}
-
-func (l *noopLogger) Init(opts ...Option) error {
-	for _, o := range opts {
-		o(&l.opts)
-	}
-	return nil
-}
-
-func (l *noopLogger) Clone(opts ...Option) Logger {
-	nl := &noopLogger{opts: l.opts}
-	for _, o := range opts {
-		o(&nl.opts)
-	}
-	return nl
-}
-
-func (l *noopLogger) Fields(attrs ...interface{}) Logger {
-	return l
-}
-
-func (l *noopLogger) Options() Options {
-	return l.opts
-}
-
-func (l *noopLogger) String() string {
-	return "noop"
-}
-
-func (l *noopLogger) Log(ctx context.Context, lvl Level, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Info(ctx context.Context, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Debug(ctx context.Context, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Error(ctx context.Context, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Trace(ctx context.Context, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Warn(ctx context.Context, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Fatal(ctx context.Context, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Logf(ctx context.Context, lvl Level, msg string, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Infof(ctx context.Context, msg string, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Debugf(ctx context.Context, msg string, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Errorf(ctx context.Context, msg string, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Tracef(ctx context.Context, msg string, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Warnf(ctx context.Context, msg string, attrs ...interface{}) {
-}
-
-func (l *noopLogger) Fatalf(ctx context.Context, msg string, attrs ...interface{}) {
-}

logger/slog/options.go

@@ -1,27 +0,0 @@
-package slog
-
-import "go.unistack.org/micro/v3/logger"
-
-type sourceKey struct{}
-
-func WithSourceKey(v string) logger.Option {
-	return logger.SetOption(sourceKey{}, v)
-}
-
-type timeKey struct{}
-
-func WithTimeKey(v string) logger.Option {
-	return logger.SetOption(timeKey{}, v)
-}
-
-type messageKey struct{}
-
-func WithMessageKey(v string) logger.Option {
-	return logger.SetOption(messageKey{}, v)
-}
-
-type levelKey struct{}
-
-func WithLevelKey(v string) logger.Option {
-	return logger.SetOption(levelKey{}, v)
-}

logger/slog/slog.go

@@ -1,430 +0,0 @@
-package slog
-
-import (
-	"context"
-	"fmt"
-	"log/slog"
-	"os"
-	"runtime"
-	"strconv"
-	"sync"
-	"time"
-
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/tracer"
-)
-
-var (
-	DefaultSourceKey  string = slog.SourceKey
-	DefaultTimeKey    string = slog.TimeKey
-	DefaultMessageKey string = slog.MessageKey
-	DefaultLevelKey   string = slog.LevelKey
-)
-
-var (
-	traceValue = slog.StringValue("trace")
-	debugValue = slog.StringValue("debug")
-	infoValue  = slog.StringValue("info")
-	warnValue  = slog.StringValue("warn")
-	errorValue = slog.StringValue("error")
-	fatalValue = slog.StringValue("fatal")
-)
-
-func (s *slogLogger) renameAttr(_ []string, a slog.Attr) slog.Attr {
-	switch a.Key {
-	case slog.SourceKey:
-		source := a.Value.Any().(*slog.Source)
-		a.Value = slog.StringValue(source.File + ":" + strconv.Itoa(source.Line))
-		a.Key = s.sourceKey
-	case slog.TimeKey:
-		a.Key = s.timeKey
-	case slog.MessageKey:
-		a.Key = s.messageKey
-	case slog.LevelKey:
-		level := a.Value.Any().(slog.Level)
-		lvl := slogToLoggerLevel(level)
-		a.Key = s.levelKey
-		switch {
-		case lvl < logger.DebugLevel:
-			a.Value = traceValue
-		case lvl < logger.InfoLevel:
-			a.Value = debugValue
-		case lvl < logger.WarnLevel:
-			a.Value = infoValue
-		case lvl < logger.ErrorLevel:
-			a.Value = warnValue
-		case lvl < logger.FatalLevel:
-			a.Value = errorValue
-		case lvl >= logger.FatalLevel:
-			a.Value = fatalValue
-		default:
-			a.Value = infoValue
-		}
-	}
-
-	return a
-}
-
-type slogLogger struct {
-	slog       *slog.Logger
-	leveler    *slog.LevelVar
-	levelKey   string
-	messageKey string
-	sourceKey  string
-	timeKey    string
-	opts       logger.Options
-	mu         sync.RWMutex
-}
-
-func (s *slogLogger) Clone(opts ...logger.Option) logger.Logger {
-	s.mu.RLock()
-	options := s.opts
-
-	for _, o := range opts {
-		o(&options)
-	}
-
-	l := &slogLogger{
-		opts:       options,
-		levelKey:   s.levelKey,
-		messageKey: s.messageKey,
-		sourceKey:  s.sourceKey,
-		timeKey:    s.timeKey,
-	}
-
-	if v, ok := l.opts.Context.Value(levelKey{}).(string); ok && v != "" {
-		l.levelKey = v
-	}
-	if v, ok := l.opts.Context.Value(messageKey{}).(string); ok && v != "" {
-		l.messageKey = v
-	}
-	if v, ok := l.opts.Context.Value(sourceKey{}).(string); ok && v != "" {
-		l.sourceKey = v
-	}
-	if v, ok := l.opts.Context.Value(timeKey{}).(string); ok && v != "" {
-		l.timeKey = v
-	}
-
-	l.leveler = new(slog.LevelVar)
-	handleOpt := &slog.HandlerOptions{
-		ReplaceAttr: s.renameAttr,
-		Level:       l.leveler,
-		AddSource:   true,
-	}
-	l.leveler.Set(loggerToSlogLevel(l.opts.Level))
-	handler := slog.NewJSONHandler(options.Out, handleOpt)
-	l.slog = slog.New(handler).With(options.Fields...)
-
-	s.mu.RUnlock()
-
-	return l
-}
-
-func (s *slogLogger) V(level logger.Level) bool {
-	return s.opts.Level.Enabled(level)
-}
-
-func (s *slogLogger) Level(level logger.Level) {
-	s.leveler.Set(loggerToSlogLevel(level))
-}
-
-func (s *slogLogger) Options() logger.Options {
-	return s.opts
-}
-
-func (s *slogLogger) Fields(attrs ...interface{}) logger.Logger {
-	s.mu.RLock()
-	nl := &slogLogger{
-		opts:       s.opts,
-		levelKey:   s.levelKey,
-		messageKey: s.messageKey,
-		sourceKey:  s.sourceKey,
-		timeKey:    s.timeKey,
-	}
-	nl.leveler = new(slog.LevelVar)
-	nl.leveler.Set(s.leveler.Level())
-
-	handleOpt := &slog.HandlerOptions{
-		ReplaceAttr: nl.renameAttr,
-		Level:       nl.leveler,
-		AddSource:   true,
-	}
-
-	handler := slog.NewJSONHandler(s.opts.Out, handleOpt)
-	nl.slog = slog.New(handler).With(attrs...)
-
-	s.mu.RUnlock()
-
-	return nl
-}
-
-func (s *slogLogger) Init(opts ...logger.Option) error {
-	s.mu.Lock()
-	for _, o := range opts {
-		o(&s.opts)
-	}
-
-	if v, ok := s.opts.Context.Value(levelKey{}).(string); ok && v != "" {
-		s.levelKey = v
-	}
-	if v, ok := s.opts.Context.Value(messageKey{}).(string); ok && v != "" {
-		s.messageKey = v
-	}
-	if v, ok := s.opts.Context.Value(sourceKey{}).(string); ok && v != "" {
-		s.sourceKey = v
-	}
-	if v, ok := s.opts.Context.Value(timeKey{}).(string); ok && v != "" {
-		s.timeKey = v
-	}
-
-	s.leveler = new(slog.LevelVar)
-	handleOpt := &slog.HandlerOptions{
-		ReplaceAttr: s.renameAttr,
-		Level:       s.leveler,
-		AddSource:   true,
-	}
-	s.leveler.Set(loggerToSlogLevel(s.opts.Level))
-	handler := slog.NewJSONHandler(s.opts.Out, handleOpt)
-	s.slog = slog.New(handler).With(s.opts.Fields...)
-
-	slog.SetDefault(s.slog)
-
-	s.mu.Unlock()
-
-	return nil
-}
-
-func (s *slogLogger) Log(ctx context.Context, lvl logger.Level, attrs ...interface{}) {
-	if !s.V(lvl) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), loggerToSlogLevel(lvl), fmt.Sprintf("%s", attrs[0]), pcs[0])
-	// r.Add(attrs[1:]...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Logf(ctx context.Context, lvl logger.Level, msg string, attrs ...interface{}) {
-	if !s.V(lvl) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), loggerToSlogLevel(lvl), fmt.Sprintf(msg, attrs...), pcs[0])
-	// r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Info(ctx context.Context, attrs ...interface{}) {
-	if !s.V(logger.InfoLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelInfo, fmt.Sprintf("%s", attrs[0]), pcs[0])
-	// r.Add(attrs[1:]...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Infof(ctx context.Context, msg string, attrs ...interface{}) {
-	if !s.V(logger.InfoLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelInfo, fmt.Sprintf(msg, attrs...), pcs[0])
-	// r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Debug(ctx context.Context, attrs ...interface{}) {
-	if !s.V(logger.DebugLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelDebug, fmt.Sprintf("%s", attrs[0]), pcs[0])
-	// r.Add(attrs[1:]...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Debugf(ctx context.Context, msg string, attrs ...interface{}) {
-	if !s.V(logger.DebugLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelDebug, fmt.Sprintf(msg, attrs...), pcs[0])
-	// r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Trace(ctx context.Context, attrs ...interface{}) {
-	if !s.V(logger.TraceLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelDebug-1, fmt.Sprintf("%s", attrs[0]), pcs[0])
-	// r.Add(attrs[1:]...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Tracef(ctx context.Context, msg string, attrs ...interface{}) {
-	if !s.V(logger.TraceLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelDebug-1, fmt.Sprintf(msg, attrs...), pcs[0])
-	// r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Error(ctx context.Context, attrs ...interface{}) {
-	if !s.V(logger.ErrorLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelError, fmt.Sprintf("%s", attrs[0]), pcs[0])
-	//	r.Add(attrs[1:]...)
-	r.Attrs(func(a slog.Attr) bool {
-		if a.Key == "error" {
-			if span, ok := tracer.SpanFromContext(ctx); ok {
-				span.SetStatus(tracer.SpanStatusError, a.Value.String())
-				return false
-			}
-		}
-		return true
-	})
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Errorf(ctx context.Context, msg string, attrs ...interface{}) {
-	if !s.V(logger.ErrorLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelError, fmt.Sprintf(msg, attrs...), pcs[0])
-	// r.Add(attrs...)
-	r.Attrs(func(a slog.Attr) bool {
-		if a.Key == "error" {
-			if span, ok := tracer.SpanFromContext(ctx); ok {
-				span.SetStatus(tracer.SpanStatusError, a.Value.String())
-				return false
-			}
-		}
-		return true
-	})
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Fatal(ctx context.Context, attrs ...interface{}) {
-	if !s.V(logger.FatalLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelError+1, fmt.Sprintf("%s", attrs[0]), pcs[0])
-	// r.Add(attrs[1:]...)
-	_ = s.slog.Handler().Handle(ctx, r)
-	os.Exit(1)
-}
-
-func (s *slogLogger) Fatalf(ctx context.Context, msg string, attrs ...interface{}) {
-	if !s.V(logger.FatalLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelError+1, fmt.Sprintf(msg, attrs...), pcs[0])
-	// r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
-	os.Exit(1)
-}
-
-func (s *slogLogger) Warn(ctx context.Context, attrs ...interface{}) {
-	if !s.V(logger.WarnLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelWarn, fmt.Sprintf("%s", attrs[0]), pcs[0])
-	// r.Add(attrs[1:]...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) Warnf(ctx context.Context, msg string, attrs ...interface{}) {
-	if !s.V(logger.WarnLevel) {
-		return
-	}
-	var pcs [1]uintptr
-	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelWarn, fmt.Sprintf(msg, attrs...), pcs[0])
-	// r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
-}
-
-func (s *slogLogger) String() string {
-	return "slog"
-}
-
-func NewLogger(opts ...logger.Option) logger.Logger {
-	s := &slogLogger{
-		opts:       logger.NewOptions(opts...),
-		sourceKey:  DefaultSourceKey,
-		timeKey:    DefaultTimeKey,
-		messageKey: DefaultMessageKey,
-		levelKey:   DefaultLevelKey,
-	}
-	if v, ok := s.opts.Context.Value(levelKey{}).(string); ok && v != "" {
-		s.levelKey = v
-	}
-	if v, ok := s.opts.Context.Value(messageKey{}).(string); ok && v != "" {
-		s.messageKey = v
-	}
-	if v, ok := s.opts.Context.Value(sourceKey{}).(string); ok && v != "" {
-		s.sourceKey = v
-	}
-	if v, ok := s.opts.Context.Value(timeKey{}).(string); ok && v != "" {
-		s.timeKey = v
-	}
-	return s
-}
-
-func loggerToSlogLevel(level logger.Level) slog.Level {
-	switch level {
-	case logger.DebugLevel:
-		return slog.LevelDebug
-	case logger.WarnLevel:
-		return slog.LevelWarn
-	case logger.ErrorLevel:
-		return slog.LevelError
-	case logger.TraceLevel:
-		return slog.LevelDebug - 1
-	case logger.FatalLevel:
-		return slog.LevelError + 1
-	default:
-		return slog.LevelInfo
-	}
-}
-
-func slogToLoggerLevel(level slog.Level) logger.Level {
-	switch level {
-	case slog.LevelDebug:
-		return logger.DebugLevel
-	case slog.LevelWarn:
-		return logger.WarnLevel
-	case slog.LevelError:
-		return logger.ErrorLevel
-	case slog.LevelDebug - 1:
-		return logger.TraceLevel
-	case slog.LevelError + 1:
-		return logger.FatalLevel
-	default:
-		return logger.InfoLevel
-	}
-}

logger/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 (

metadata/context.go

@@ -39,6 +39,8 @@ 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
@@ -51,6 +53,8 @@ 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"
@@ -19,8 +19,6 @@ var (
 	HeaderTimeout = "Micro-Timeout"
 	// HeaderAuthorization specifies Authorization header
 	HeaderAuthorization = "Authorization"
-	// HeaderXRequestID specifies request id
-	HeaderXRequestID = "X-Request-Id"
 )
 
 // Metadata is our way of representing request headers internally.

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"

meter/options.go

@@ -3,7 +3,7 @@ package meter
 import (
 	"context"
 
-	"go.unistack.org/micro/v3/logger"
+	"go.unistack.org/micro/v4/logger"
 )
 
 // Option powers the configuration for metrics implementations:

meter/wrapper/wrapper.go

@@ -1,13 +1,13 @@
-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/server"
 )
 
 var (

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

@@ -1,9 +1,9 @@
 // Package network is for creating internetworks
-package network // import "go.unistack.org/micro/v3/network"
+package network // import "go.unistack.org/micro/v4/network"
 
 import (
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/server"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/server"
 )
 
 // Error is network node errors

network/options.go

@@ -1,13 +1,13 @@
 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"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/network/tunnel"
+	"go.unistack.org/micro/v4/proxy"
+	"go.unistack.org/micro/v4/router"
+	"go.unistack.org/micro/v4/tracer"
+	"go.unistack.org/micro/v4/util/id"
 )
 
 // Option func

network/transport/memory.go

@@ -8,9 +8,9 @@ import (
 	"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"
+	maddr "go.unistack.org/micro/v4/util/addr"
+	mnet "go.unistack.org/micro/v4/util/net"
+	"go.unistack.org/micro/v4/util/rand"
 )
 
 type memorySocket struct {

network/transport/options.go

@@ -5,10 +5,10 @@ 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/tracer"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options struct holds the transport options

network/transport/transport.go

@@ -1,11 +1,11 @@
 // Package transport is an interface for synchronous connection based communication
-package transport // import "go.unistack.org/micro/v3/network/transport"
+package transport // import "go.unistack.org/micro/v4/network/transport"
 
 import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 var (

network/tunnel/broker/broker.go

@@ -1,15 +1,15 @@
 // Package broker is a tunnel broker
-package broker // import "go.unistack.org/micro/v3/network/tunnel/broker"
+package broker // import "go.unistack.org/micro/v4/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"
+	"go.unistack.org/micro/v4/broker"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/network/transport"
+	"go.unistack.org/micro/v4/network/tunnel"
 )
 
 type tunBroker struct {

network/tunnel/options.go

@@ -3,11 +3,11 @@ 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"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/network/transport"
+	"go.unistack.org/micro/v4/tracer"
+	"go.unistack.org/micro/v4/util/id"
 )
 
 var (

network/tunnel/transport/listener.go

@@ -1,8 +1,8 @@
 package transport
 
 import (
-	"go.unistack.org/micro/v3/network/transport"
-	"go.unistack.org/micro/v3/network/tunnel"
+	"go.unistack.org/micro/v4/network/transport"
+	"go.unistack.org/micro/v4/network/tunnel"
 )
 
 type tunListener struct {

network/tunnel/transport/transport.go

@@ -1,12 +1,12 @@
 // Package transport provides a tunnel transport
-package transport // import "go.unistack.org/micro/v3/network/tunnel/transport"
+package transport // import "go.unistack.org/micro/v4/network/tunnel/transport"
 
 import (
 	"context"
 	"fmt"
 
-	"go.unistack.org/micro/v3/network/transport"
-	"go.unistack.org/micro/v3/network/tunnel"
+	"go.unistack.org/micro/v4/network/transport"
+	"go.unistack.org/micro/v4/network/tunnel"
 )
 
 type tunTransport struct {

network/tunnel/tunnel.go

@@ -1,12 +1,12 @@
 // Package tunnel provides gre network tunnelling
-package tunnel // import "go.unistack.org/micro/v3/network/transport/tunnel"
+package tunnel // import "go.unistack.org/micro/v4/network/transport/tunnel"
 
 import (
 	"context"
 	"errors"
 	"time"
 
-	"go.unistack.org/micro/v3/network/transport"
+	"go.unistack.org/micro/v4/network/transport"
 )
 
 // DefaultTunnel contains default tunnel implementation

options.go

@@ -5,17 +5,17 @@ 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/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

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{}

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

@@ -2,11 +2,11 @@
 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"
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/router"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 // Options for proxy

proxy/proxy.go

@@ -1,10 +1,10 @@
 // Package proxy is a transparent proxy built on the micro/server
-package proxy // import "go.unistack.org/micro/v3/proxy"
+package proxy // import "go.unistack.org/micro/v4/proxy"
 
 import (
 	"context"
 
-	"go.unistack.org/micro/v3/server"
+	"go.unistack.org/micro/v4/server"
 )
 
 // DefaultEndpoint holds default proxy address

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"

server/errors.go

@@ -1,6 +1,6 @@
 package server
 
-import "go.unistack.org/micro/v3/errors"
+import "go.unistack.org/micro/v4/errors"
 
 type Error struct {
 	id string

server/errors_test.go

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

server/handler.go

@@ -3,7 +3,7 @@ package server
 import (
 	"reflect"
 
-	"go.unistack.org/micro/v3/register"
+	"go.unistack.org/micro/v4/register"
 )
 
 type rpcHandler struct {

server/noop.go

@@ -6,13 +6,13 @@ import (
 	"sync"
 	"time"
 
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/register"
-	maddr "go.unistack.org/micro/v3/util/addr"
-	mnet "go.unistack.org/micro/v3/util/net"
-	"go.unistack.org/micro/v3/util/rand"
+	"go.unistack.org/micro/v4/broker"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/register"
+	maddr "go.unistack.org/micro/v4/util/addr"
+	mnet "go.unistack.org/micro/v4/util/net"
+	"go.unistack.org/micro/v4/util/rand"
 )
 
 // DefaultCodecs will be used to encode/decode
@@ -202,6 +202,39 @@ func (n *noopServer) Register() error {
 	n.Lock()
 	defer n.Unlock()
 
+	cx := config.Context
+
+	var sub broker.Subscriber
+
+	for sb := range n.subscribers {
+		if sb.Options().Context != nil {
+			cx = sb.Options().Context
+		}
+
+		opts := []broker.SubscribeOption{broker.SubscribeContext(cx), broker.SubscribeAutoAck(sb.Options().AutoAck)}
+		if queue := sb.Options().Queue; len(queue) > 0 {
+			opts = append(opts, broker.SubscribeGroup(queue))
+		}
+
+		if sb.Options().Batch {
+			// batch processing handler
+			sub, err = config.Broker.BatchSubscribe(cx, sb.Topic(), n.newBatchSubHandler(sb, config), opts...)
+		} else {
+			// single processing handler
+			sub, err = config.Broker.Subscribe(cx, sb.Topic(), n.newSubHandler(sb, config), opts...)
+		}
+
+		if err != nil {
+			return err
+		}
+
+		if config.Logger.V(logger.InfoLevel) {
+			config.Logger.Infof(n.opts.Context, "subscribing to topic: %s", sb.Topic())
+		}
+
+		n.subscribers[sb] = []broker.Subscriber{sub}
+	}
+
 	n.registered = true
 	if cacheService {
 		n.rsvc = service
@@ -333,10 +366,6 @@ func (n *noopServer) Start() error {
 		}
 	}
 
-	if err := n.subscribe(); err != nil {
-		return err
-	}
-
 	go func() {
 		t := new(time.Ticker)
 
@@ -420,45 +449,6 @@ func (n *noopServer) Start() error {
 	return nil
 }
 
-func (n *noopServer) subscribe() error {
-	config := n.Options()
-
-	cx := config.Context
-	var err error
-	var sub broker.Subscriber
-
-	for sb := range n.subscribers {
-		if sb.Options().Context != nil {
-			cx = sb.Options().Context
-		}
-
-		opts := []broker.SubscribeOption{broker.SubscribeContext(cx), broker.SubscribeAutoAck(sb.Options().AutoAck)}
-		if queue := sb.Options().Queue; len(queue) > 0 {
-			opts = append(opts, broker.SubscribeGroup(queue))
-		}
-
-		if sb.Options().Batch {
-			// batch processing handler
-			sub, err = config.Broker.BatchSubscribe(cx, sb.Topic(), n.createBatchSubHandler(sb, config), opts...)
-		} else {
-			// single processing handler
-			sub, err = config.Broker.Subscribe(cx, sb.Topic(), n.createSubHandler(sb, config), opts...)
-		}
-
-		if err != nil {
-			return err
-		}
-
-		if config.Logger.V(logger.InfoLevel) {
-			config.Logger.Infof(n.opts.Context, "subscribing to topic: %s", sb.Topic())
-		}
-
-		n.subscribers[sb] = []broker.Subscriber{sub}
-	}
-
-	return nil
-}
-
 func (n *noopServer) Stop() error {
 	n.RLock()
 	if !n.started {

server/noop_test.go

@@ -5,12 +5,12 @@ import (
 	"fmt"
 	"testing"
 
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/server"
+	"go.unistack.org/micro/v4/broker"
+	"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/server"
 )
 
 type TestHandler struct {

server/options.go

@@ -7,16 +7,16 @@ import (
 	"sync"
 	"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/options"
-	"go.unistack.org/micro/v3/register"
-	"go.unistack.org/micro/v3/tracer"
-	"go.unistack.org/micro/v3/util/id"
+	"go.unistack.org/micro/v4/broker"
+	"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/network/transport"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/tracer"
+	"go.unistack.org/micro/v4/util/id"
 )
 
 // Option func

server/registry.go

@@ -4,10 +4,10 @@ import (
 	"net"
 	"time"
 
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/register"
-	"go.unistack.org/micro/v3/util/addr"
-	"go.unistack.org/micro/v3/util/backoff"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/util/addr"
+	"go.unistack.org/micro/v4/util/backoff"
 )
 
 var (

server/request.go

@@ -1,8 +1,8 @@
 package server
 
 import (
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/metadata"
 )
 
 type rpcMessage struct {

server/server.go

@@ -1,13 +1,13 @@
 // Package server is an interface for a micro server
-package server // import "go.unistack.org/micro/v3/server"
+package server // import "go.unistack.org/micro/v4/server"
 
 import (
 	"context"
 	"time"
 
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/register"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/register"
 )
 
 // DefaultServer default server

server/subscriber.go

@@ -10,12 +10,12 @@ import (
 	"unicode"
 	"unicode/utf8"
 
-	"go.unistack.org/micro/v3/broker"
-	"go.unistack.org/micro/v3/codec"
-	"go.unistack.org/micro/v3/errors"
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/metadata"
-	"go.unistack.org/micro/v3/register"
+	"go.unistack.org/micro/v4/broker"
+	"go.unistack.org/micro/v4/codec"
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/register"
 )
 
 const (
@@ -191,7 +191,7 @@ func newSubscriber(topic string, sub interface{}, opts ...SubscriberOption) Subs
 }
 
 //nolint:gocyclo
-func (n *noopServer) createBatchSubHandler(sb *subscriber, opts Options) broker.BatchHandler {
+func (n *noopServer) newBatchSubHandler(sb *subscriber, opts Options) broker.BatchHandler {
 	return func(ps broker.Events) (err error) {
 		defer func() {
 			if r := recover(); r != nil {
@@ -309,7 +309,7 @@ func (n *noopServer) createBatchSubHandler(sb *subscriber, opts Options) broker.
 }
 
 //nolint:gocyclo
-func (n *noopServer) createSubHandler(sb *subscriber, opts Options) broker.Handler {
+func (n *noopServer) newSubHandler(sb *subscriber, opts Options) broker.Handler {
 	return func(p broker.Event) (err error) {
 		defer func() {
 			if r := recover(); r != nil {
@@ -342,6 +342,9 @@ func (n *noopServer) createSubHandler(sb *subscriber, opts Options) broker.Handl
 
 		hdr := metadata.New(len(msg.Header))
 		for k, v := range msg.Header {
+			if k == "Content-Type" {
+				continue
+			}
 			hdr.Set(k, v)
 		}
 

service.go

@@ -1,20 +1,20 @@
 // Package micro is a pluggable framework for microservices
-package micro // import "go.unistack.org/micro/v3"
+package micro // import "go.unistack.org/micro/v4"
 
 import (
 	"fmt"
 	"sync"
 
-	"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/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/meter"
+	"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"
 )
 
 // Service is an interface that wraps the lower level components.
@@ -88,7 +88,6 @@ func (s *service) Name() string {
 // Init initialises options. Additionally it calls cmd.Init
 // which parses command line flags. cmd.Init is only called
 // on first Init.
-//
 //nolint:gocyclo
 func (s *service) Init(opts ...Option) error {
 	var err error
@@ -376,71 +375,19 @@ func (s *service) Run() error {
 	return s.Stop()
 }
 
-func getNameIndex(n string, ifaces interface{}) int {
-	switch values := ifaces.(type) {
-	case []router.Router:
-		for idx, iface := range values {
-			if iface.Name() == n {
-				return idx
-			}
-		}
-	case []register.Register:
-		for idx, iface := range values {
-			if iface.Name() == n {
-				return idx
-			}
-		}
-	case []store.Store:
-		for idx, iface := range values {
-			if iface.Name() == n {
-				return idx
-			}
-		}
-	case []tracer.Tracer:
-		for idx, iface := range values {
-			if iface.Name() == n {
-				return idx
-			}
-		}
-	case []server.Server:
-		for idx, iface := range values {
-			if iface.Name() == n {
-				return idx
-			}
-		}
-	case []config.Config:
-		for idx, iface := range values {
-			if iface.Name() == n {
-				return idx
-			}
-		}
-	case []meter.Meter:
-		for idx, iface := range values {
-			if iface.Name() == n {
-				return idx
-			}
-		}
-	case []broker.Broker:
-		for idx, iface := range values {
-			if iface.Name() == n {
-				return idx
-			}
-		}
-	case []client.Client:
-		for idx, iface := range values {
-			if iface.Name() == n {
-				return idx
-			}
-		}
-		/*
-			case []logger.Logger:
-					for idx, iface := range values {
-						if iface.Name() == n {
-							return idx
-						}
-					}
-		*/
-	}
+type nameIface interface {
+	Name() string
+}
 
+func getNameIndex(n string, ifaces interface{}) int {
+	values, ok := ifaces.([]interface{})
+	if !ok {
+		return 0
+	}
+	for idx, iface := range values {
+		if ifc, ok := iface.(nameIface); ok && ifc.Name() == n {
+			return idx
+		}
+	}
 	return 0
 }

service_test.go

@@ -5,33 +5,18 @@ import (
 	"reflect"
 	"testing"
 
-	"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/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/meter"
+	"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"
 )
 
-func TestClient(t *testing.T) {
-	c1 := client.NewClient(client.Name("test1"))
-	c2 := client.NewClient(client.Name("test2"))
-
-	svc := NewService(Client(c1, c2))
-	if err := svc.Init(); err != nil {
-		t.Fatal(err)
-	}
-
-	x1 := svc.Client("test2")
-	if x1.Name() != "test2" {
-		t.Fatal("invalid client")
-	}
-}
-
 type testItem struct {
 	name string
 }

store/memory_test.go

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

store/options.go

@@ -5,11 +5,11 @@ import (
 	"crypto/tls"
 	"time"
 
-	"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/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/tracer"
 )
 
 // Options contains configuration for the Store

store/store.go

@@ -1,5 +1,5 @@
 // Package store is an interface for distributed data storage.
-package store // import "go.unistack.org/micro/v3/store"
+package store // import "go.unistack.org/micro/v4/store"
 
 import (
 	"context"

sync/options.go

@@ -3,9 +3,9 @@ package sync
 import (
 	"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 the sync options