Удалить .gitea/workflows/autoupdate.yml

Coverage default.go

Added tests for default.go. The tests are successful

Co-authored-by: Aleksandr Tolstikhin <atolstikhin@mtsbank.ru>
Co-authored-by: Василий Толстов <v.tolstov@unistack.org>
Reviewed-on: #330
Reviewed-by: Василий Толстов <v.tolstov@unistack.org>
Co-authored-by: Александр Толстихин <tolstihin1996@mail.ru>
Co-committed-by: Александр Толстихин <tolstihin1996@mail.ru>

.gitea/workflows/autoupdate.yml

@@ -1,24 +0,0 @@
-on:
-  push:
-    branches:
-    - 'main'
-    - 'master'
-    - 'v3'
-  schedule:
-    #- cron: '* * * * *'
-    - cron: '@hourly'
-
-jobs:
-  autoupdate:
-    runs-on: ubuntu-latest
-    steps:
-    - name: setup-go
-      uses: https://gitea.com/actions/setup-go@v3
-      with:
-        go-version: 1.21
-    - name: checkout
-      uses: https://gitea.com/actions/checkout@v3
-    - name: get pkgdashcli
-      run: GOPROXY=direct GONOSUMDB="git.unistack.org/*" GONOPROXY="git.unistack.org/*" GOBIN=/bin go install git.unistack.org/unistack-org/pkgdash/cmd/pkgdashcli@latest
-    - name: pkgdashcli check
-      run: /bin/pkgdashcli check

.gitea/workflows/coverage.yml

@@ -0,0 +1,30 @@
+name: Go
+
+on:
+  push:
+    branches: [ master, v3 ]
+  pull_request:
+    branches: [ master, v3 ]
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout
+      uses: actions/checkout@v4
+
+    - name: setup
+      uses: actions/setup-go@v4
+      with:
+        go-version: stable
+
+    - name: coverage
+      run: go test -v -coverprofile coverage.out ./...
+
+    - name: badge
+      uses: ncruces/go-coverage-report@main
+      with:
+        coverage-file: coverage.out
+        reuse-go: true
+        amend: true

.gitignore

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

.golangci.yml

@@ -1,6 +1,5 @@
 run:
   concurrency: 4
-  deadline: 5m
   issues-exit-code: 1
   tests: true
 
@@ -13,15 +12,13 @@ linters-settings:
 linters:
   enable:
     - govet
-    - deadcode
     - errcheck
     - govet
     - ineffassign
     - staticcheck
-    - structcheck
     - typecheck
     - unused
-    - varcheck
+    - spancheck
     - bodyclose
     - gci
     - goconst
@@ -41,4 +38,5 @@ linters:
     - prealloc
     - unconvert
     - unparam
+    - unused
   disable-all: false

broker/broker.go

@@ -4,6 +4,7 @@ package broker // import "go.unistack.org/micro/v4/broker"
 import (
 	"context"
 	"errors"
+	"time"
 
 	"go.unistack.org/micro/v4/metadata"
 	"go.unistack.org/micro/v4/options"
@@ -19,6 +20,8 @@ var (
 	ErrDisconnected = errors.New("broker disconnected")
 	// ErrInvalidMessage returns when message has nvalid format
 	ErrInvalidMessage = errors.New("broker message has invalid format")
+	// DefaultGracefulTimeout
+	DefaultGracefulTimeout = 5 * time.Second
 )
 
 // Broker is an interface used for asynchronous messaging.

broker/memory_test.go

@@ -37,10 +37,10 @@ func TestMemoryBatchBroker(t *testing.T) {
 	msgs := make([]Message, 0, count)
 	for i := 0; i < count; i++ {
 		message := &memoryMessage{
-			header: map[string]string{
+			header: metadata.Metadata{
-				metadata.HeaderTopic: topic,
+				metadata.HeaderTopic: []string{topic},
-				"foo":                "bar",
+				"foo":                []string{"bar"},
-				"id":                 fmt.Sprintf("%d", i),
+				"id":                 []string{fmt.Sprintf("%d", i)},
 			},
 			body: []byte(`"hello world"`),
 		}
@@ -83,10 +83,10 @@ func TestMemoryBroker(t *testing.T) {
 	msgs := make([]Message, 0, count)
 	for i := 0; i < count; i++ {
 		message := &memoryMessage{
-			header: map[string]string{
+			header: metadata.Metadata{
-				metadata.HeaderTopic: topic,
+				metadata.HeaderTopic: []string{topic},
-				"foo":                "bar",
+				"foo":                []string{"bar"},
-				"id":                 fmt.Sprintf("%d", i),
+				"id":                 []string{fmt.Sprintf("%d", i)},
 			},
 			body: []byte(`"hello world"`),
 		}

broker/options.go

@@ -11,6 +11,7 @@ import (
 	"go.unistack.org/micro/v4/meter"
 	"go.unistack.org/micro/v4/options"
 	"go.unistack.org/micro/v4/register"
+	"go.unistack.org/micro/v4/sync"
 	"go.unistack.org/micro/v4/tracer"
 )
 
@@ -36,36 +37,41 @@ type Options struct {
 	Name string
 	// Address holds the broker address
 	Address []string
+
+	Wait *sync.WaitGroup
+
+	GracefulTimeout time.Duration
 }
 
 // NewOptions create new Options
 func NewOptions(opts ...options.Option) Options {
-	options := Options{
+	newOpts := Options{
-		Register: register.DefaultRegister,
+		Register:        register.DefaultRegister,
-		Logger:   logger.DefaultLogger,
+		Logger:          logger.DefaultLogger,
-		Context:  context.Background(),
+		Context:         context.Background(),
-		Meter:    meter.DefaultMeter,
+		Meter:           meter.DefaultMeter,
-		Codecs:   make(map[string]codec.Codec),
+		Codecs:          make(map[string]codec.Codec),
-		Tracer:   tracer.DefaultTracer,
+		Tracer:          tracer.DefaultTracer,
+		GracefulTimeout: DefaultGracefulTimeout,
 	}
 	for _, o := range opts {
-		o(&options)
+		o(&newOpts)
 	}
-	return options
+	return newOpts
 }
 
 // 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
+	// BodyOnly flag says the message contains raw body bytes
+	BodyOnly bool
 }
 
 // NewPublishOptions creates PublishOptions struct

broker/subscriber.go

@@ -19,8 +19,8 @@ var typeOfError = reflect.TypeOf((*error)(nil)).Elem()
 
 // Is this an exported - upper case - name?
 func isExported(name string) bool {
-	rune, _ := utf8.DecodeRuneInString(name)
+	r, _ := utf8.DecodeRuneInString(name)
-	return unicode.IsUpper(rune)
+	return unicode.IsUpper(r)
 }
 
 // Is this type exported or a builtin?

config/default_test.go

@@ -31,6 +31,9 @@ func (c *cfg) Validate() error {
 	if c.IntValue != 10 {
 		return fmt.Errorf("invalid IntValue %d != %d", 10, c.IntValue)
 	}
+	if c.MapValue["key1"] != true {
+		return fmt.Errorf("invalid MapValue %t != %t", true, c.MapValue["key1"])
+	}
 	return nil
 }
 
@@ -105,3 +108,19 @@ func TestValidate(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+func TestString(t *testing.T) {
+	cfg := config.NewConfig()
+	res := cfg.String()
+	if res != "default" {
+		t.Fatalf("string value invalid: %s", res)
+	}
+}
+
+func TestName(t *testing.T) {
+	cfg := config.NewConfig()
+	res := cfg.Name()
+	if res != "" {
+		t.Fatal("name value not empty")
+	}
+}

database/dsn.go

@@ -75,78 +75,80 @@ func ParseDSN(dsn string) (*Config, error) {
 	// Find last '/' that goes before dbname
 	foundSlash := false
 	for i := len(dsn) - 1; i >= 0; i-- {
-		if dsn[i] == '/' {
+		if dsn[i] != '/' {
-			foundSlash = true
+			continue
-			var j, k int
+		}
 
-			// left part is empty if i <= 0
+		foundSlash = true
-			if i > 0 {
+		var j, k int
-				// Find the first ':' in dsn
+
-				for j = i; j >= 0; j-- {
+		// left part is empty if i <= 0
-					if dsn[j] == ':' {
+		if i > 0 {
-						cfg.Scheme = dsn[0:j]
+			// 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]
+			// [username[:password]@][host]
-			// Find the first '?' in dsn[i+1:]
+			// Find the last '@' in dsn[:i]
-			for j = i + 1; j < len(dsn); j++ {
+			for j = i; j >= 0; j-- {
-				if dsn[j] == '?' {
+				if dsn[j] == '@' {
-					parts := strings.Split(dsn[j+1:], "&")
+					// username[:password]
-					cfg.Params = make([]string, 0, len(parts)*2)
+					// Find the second ':' in dsn[:j]
-					for _, p := range parts {
+					for k = 0; k < j; k++ {
-						k, v, found := strings.Cut(p, "=")
+						if dsn[k] == ':' {
-						if !found {
+							if cfg.Scheme == dsn[:k] {
-							continue
+								continue
+							}
+							var err error
+							cfg.Password, err = url.PathUnescape(dsn[k+1 : j])
+							if err != nil {
+								return nil, err
+							}
+							break
 						}
-						cfg.Params = append(cfg.Params, k, v)
 					}
-
+					cfg.Username = dsn[len(cfg.Scheme)+3 : k]
 					break
 				}
 			}
-			var err error
+
-			dbname := dsn[i+1 : j]
+			for k = j + 1; k < i; k++ {
-			if cfg.Database, err = url.PathUnescape(dbname); err != nil {
+				if dsn[k] == ':' {
-				return nil, fmt.Errorf("invalid dbname %q: %w", dbname, err)
+					cfg.Host = dsn[j+1 : k]
+					cfg.Port = dsn[k+1 : i]
+					break
+				}
 			}
 
-			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 {

flow/flow_test.go

@@ -0,0 +1,36 @@
+package flow
+
+import (
+	"reflect"
+	"testing"
+)
+
+func FuzzMarshall(f *testing.F) {
+	f.Fuzz(func(t *testing.T, ref []byte) {
+		rm := RawMessage(ref)
+
+		b, err := rm.MarshalJSON()
+		if err != nil {
+			t.Errorf("Error MarshalJSON: %s", err)
+		}
+
+		if !reflect.DeepEqual(ref, b) {
+			t.Errorf("Error. Expected '%s', was '%s'", ref, b)
+		}
+	})
+}
+
+func FuzzUnmarshall(f *testing.F) {
+	f.Fuzz(func(t *testing.T, ref string) {
+		b := []byte(ref)
+		rm := RawMessage(b)
+
+		if err := rm.UnmarshalJSON(b); err != nil {
+			t.Errorf("Error UnmarshalJSON: %s", err)
+		}
+
+		if ref != string(rm) {
+			t.Errorf("Error. Expected '%s', was '%s'", ref, rm)
+		}
+	})
+}

go.mod

@@ -5,17 +5,16 @@ go 1.20
 require (
 	dario.cat/mergo v1.0.0
 	github.com/DATA-DOG/go-sqlmock v1.5.0
-	github.com/google/uuid v1.3.1
+	github.com/google/uuid v1.6.0
 	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
+	golang.org/x/sync v0.6.0
-	golang.org/x/sys v0.12.0
+	golang.org/x/sys v0.16.0
-	google.golang.org/grpc v1.58.2
+	google.golang.org/grpc v1.62.1
-	google.golang.org/protobuf v1.31.0
+	google.golang.org/protobuf v1.32.0
 )
 
 require (
 	github.com/golang/protobuf v1.5.3 // indirect
-	golang.org/x/net v0.15.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240123012728-ef4313101c80 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98 // indirect
 )

go.sum

@@ -6,29 +6,28 @@ github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaS
 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/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-github.com/google/uuid v1.3.1 h1:KjJaJ9iWZ3jOFZIf1Lqf4laDRCasjl0BCmnEGxkdLb4=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
-github.com/google/uuid v1.3.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 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 v0.15.0 h1:ugBLEUaxABaB5AJqW9enI0ACdci2RUd4eP51NTBvuJ8=
+golang.org/x/net v0.20.0 h1:aCL9BSgETF1k+blQaYUBx9hJ9LOGP3gAVemcZlf1Kpo=
-golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
+golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
-golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
+golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
+golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
-golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
+golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
-golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98 h1:bVf09lpb+OJbByTj913DRJioFFAjf/ZGxEz7MajTp2U=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240123012728-ef4313101c80 h1:AjyfHzEPEFp/NpvfN5g+KDla3EMojjhRVZc1i7cj+oM=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98/go.mod h1:TUfxEVdsvPg18p6AslUXFoLdpED4oBnGwyqk3dV1XzM=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240123012728-ef4313101c80/go.mod h1:PAREbraiVEVGVdTZsVWjSbbTtSyGbAgIIvni8a8CD5s=
-google.golang.org/grpc v1.58.2 h1:SXUpjxeVF3FKrTYQI4f4KvbGD5u2xccdYdurwowix5I=
+google.golang.org/grpc v1.62.1 h1:B4n+nfKzOICUXMgyrNd19h/I9oH0L1pizfk1d4zSgTk=
-google.golang.org/grpc v1.58.2/go.mod h1:tgX3ZQDlNJGU96V6yHh1T/JeoBQ2TXdr43YbYSsCJk0=
+google.golang.org/grpc v1.62.1/go.mod h1:IWTG0VlJLCh1SkC58F7np9ka9mx/WNkjl4PGJaiq+QE=
 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 v1.32.0 h1:pPC6BG5ex8PDFnkbrGU3EixyhKcQ2aDuBS36lqK/C7I=
-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.32.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 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/logger.go

@@ -64,8 +64,8 @@ func Error(ctx context.Context, msg string, attrs ...interface{}) {
 	DefaultLogger.Error(ctx, msg, attrs...)
 }
 
-// Debugf writes formatted msg to default logger on debug level
+// Debug writes formatted msg to default logger on debug level
-func Debugf(ctx context.Context, msg string, attrs ...interface{}) {
+func Debug(ctx context.Context, msg string, attrs ...interface{}) {
 	DefaultLogger.Debug(ctx, msg, attrs...)
 }
 

logger/options.go

@@ -6,6 +6,7 @@ import (
 	"log/slog"
 	"os"
 	"reflect"
+	"time"
 
 	"go.unistack.org/micro/v4/options"
 	rutil "go.unistack.org/micro/v4/util/reflect"
@@ -17,18 +18,12 @@ type Options struct {
 	Out io.Writer
 	// Context holds exernal options
 	Context context.Context
-	// Attrs holds additional attributes
+	// TimeFunc used to obtain current time
-	Attrs []interface{}
+	TimeFunc func() time.Time
-	// Name holds the logger name
-	Name string
-	// The logging level the logger should log
-	Level Level
-	// CallerSkipCount number of frmaes to skip
-	CallerSkipCount int
-	// ContextAttrFuncs contains funcs that executed before log func on context
-	ContextAttrFuncs []ContextAttrFunc
 	// TimeKey is the key used for the time of the log call
 	TimeKey string
+	// Name holds the logger name
+	Name string
 	// LevelKey is the key used for the level of the log call
 	LevelKey string
 	// MessageKey is the key used for the message of the log call
@@ -39,6 +34,14 @@ type Options struct {
 	SourceKey string
 	// StacktraceKey is the key used for the stacktrace
 	StacktraceKey string
+	// Attrs holds additional attributes
+	Attrs []interface{}
+	// ContextAttrFuncs contains funcs that executed before log func on context
+	ContextAttrFuncs []ContextAttrFunc
+	// CallerSkipCount number of frmaes to skip
+	CallerSkipCount int
+	// The logging level the logger should log
+	Level Level
 	// AddStacktrace controls writing of stacktaces on error
 	AddStacktrace bool
 	// AddSource enabled writing source file and position in log
@@ -55,6 +58,7 @@ func NewOptions(opts ...options.Option) Options {
 		Context:          context.Background(),
 		ContextAttrFuncs: DefaultContextAttrFuncs,
 		AddSource:        true,
+		TimeFunc:         time.Now,
 	}
 
 	_ = WithMicroKeys()(&options)
@@ -210,6 +214,20 @@ func WithMicroKeys() options.Option {
 	}
 }
 
+// WithAddCallerSkipCount add skip count for copy logger
+func WithAddCallerSkipCount(n int) options.Option {
+	return func(src interface{}) error {
+		c, err := options.Get(src, ".CallerSkipCount")
+		if err != nil {
+			return err
+		}
+		if err = options.Set(src, c.(int)+n, ".CallerSkipCount"); err != nil {
+			return err
+		}
+		return nil
+	}
+}
+
 // WithAddStacktrace controls writing stacktrace on error
 func WithAddStacktrace(v bool) options.Option {
 	return func(src interface{}) error {

logger/slog/slog.go

@@ -8,7 +8,6 @@ import (
 	"runtime"
 	"strconv"
 	"sync"
-	"time"
 
 	"go.unistack.org/micro/v4/logger"
 	"go.unistack.org/micro/v4/options"
@@ -62,8 +61,8 @@ func (s *slogLogger) renameAttr(_ []string, a slog.Attr) slog.Attr {
 }
 
 type slogLogger struct {
-	slog    *slog.Logger
 	leveler *slog.LevelVar
+	handler slog.Handler
 	opts    logger.Options
 	mu      sync.RWMutex
 }
@@ -71,6 +70,7 @@ type slogLogger struct {
 func (s *slogLogger) Clone(opts ...options.Option) logger.Logger {
 	s.mu.RLock()
 	options := s.opts
+	s.mu.RUnlock()
 
 	for _, o := range opts {
 		_ = o(&options)
@@ -87,10 +87,7 @@ func (s *slogLogger) Clone(opts ...options.Option) logger.Logger {
 		AddSource:   l.opts.AddSource,
 	}
 	l.leveler.Set(loggerToSlogLevel(l.opts.Level))
-	handler := slog.NewJSONHandler(options.Out, handleOpt)
+	l.handler = slog.New(slog.NewJSONHandler(options.Out, handleOpt)).With(options.Attrs...).Handler()
-	l.slog = slog.New(handler).With(options.Attrs...)
-
-	s.mu.RUnlock()
 
 	return l
 }
@@ -109,9 +106,13 @@ func (s *slogLogger) Options() logger.Options {
 
 func (s *slogLogger) Attrs(attrs ...interface{}) logger.Logger {
 	s.mu.RLock()
-	l := &slogLogger{opts: s.opts}
+	level := s.leveler.Level()
+	options := s.opts
+	s.mu.RUnlock()
+
+	l := &slogLogger{opts: options}
 	l.leveler = new(slog.LevelVar)
-	l.leveler.Set(s.leveler.Level())
+	l.leveler.Set(level)
 
 	handleOpt := &slog.HandlerOptions{
 		ReplaceAttr: l.renameAttr,
@@ -119,10 +120,7 @@ func (s *slogLogger) Attrs(attrs ...interface{}) logger.Logger {
 		AddSource:   l.opts.AddSource,
 	}
 
-	handler := slog.NewJSONHandler(s.opts.Out, handleOpt)
+	l.handler = slog.New(slog.NewJSONHandler(s.opts.Out, handleOpt)).With(attrs...).Handler()
-	l.slog = slog.New(handler).With(attrs...)
-
-	s.mu.RUnlock()
 
 	return l
 }
@@ -147,8 +145,7 @@ func (s *slogLogger) Init(opts ...options.Option) error {
 		AddSource:   s.opts.AddSource,
 	}
 	s.leveler.Set(loggerToSlogLevel(s.opts.Level))
-	handler := slog.NewJSONHandler(s.opts.Out, handleOpt)
+	s.handler = slog.New(slog.NewJSONHandler(s.opts.Out, handleOpt)).With(s.opts.Attrs...).Handler()
-	s.slog = slog.New(handler).With(s.opts.Attrs...)
 	s.mu.Unlock()
 
 	return nil
@@ -160,13 +157,13 @@ func (s *slogLogger) Log(ctx context.Context, lvl logger.Level, msg string, attr
 	}
 	var pcs [1]uintptr
 	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), loggerToSlogLevel(lvl), msg, pcs[0])
+	r := slog.NewRecord(s.opts.TimeFunc(), loggerToSlogLevel(lvl), msg, pcs[0])
 	for _, fn := range s.opts.ContextAttrFuncs {
 		attrs = append(attrs, fn(ctx)...)
 	}
-	for _, a := range attrs {
+	for idx, attr := range attrs {
-		if ve, ok := a.(error); ok && ve != nil {
+		if ve, ok := attr.(error); ok && ve != nil {
-			attrs = append(attrs, slog.String(s.opts.ErrorKey, ve.Error()))
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
 			break
 		}
 	}
@@ -189,7 +186,7 @@ func (s *slogLogger) Log(ctx context.Context, lvl logger.Level, msg string, attr
 		}
 		return true
 	})
-	_ = s.slog.Handler().Handle(ctx, r)
+	_ = s.handler.Handle(ctx, r)
 }
 
 func (s *slogLogger) Info(ctx context.Context, msg string, attrs ...interface{}) {
@@ -198,12 +195,18 @@ func (s *slogLogger) Info(ctx context.Context, msg string, attrs ...interface{})
 	}
 	var pcs [1]uintptr
 	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelInfo, msg, pcs[0])
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelInfo, msg, pcs[0])
 	for _, fn := range s.opts.ContextAttrFuncs {
 		attrs = append(attrs, fn(ctx)...)
 	}
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
 	r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
+	_ = s.handler.Handle(ctx, r)
 }
 
 func (s *slogLogger) Debug(ctx context.Context, msg string, attrs ...interface{}) {
@@ -212,12 +215,18 @@ func (s *slogLogger) Debug(ctx context.Context, msg string, attrs ...interface{}
 	}
 	var pcs [1]uintptr
 	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelDebug, msg, pcs[0])
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelDebug, msg, pcs[0])
 	for _, fn := range s.opts.ContextAttrFuncs {
 		attrs = append(attrs, fn(ctx)...)
 	}
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
 	r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
+	_ = s.handler.Handle(ctx, r)
 }
 
 func (s *slogLogger) Trace(ctx context.Context, msg string, attrs ...interface{}) {
@@ -226,12 +235,18 @@ func (s *slogLogger) Trace(ctx context.Context, msg string, attrs ...interface{}
 	}
 	var pcs [1]uintptr
 	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelDebug-1, msg, pcs[0])
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelDebug-1, msg, pcs[0])
 	for _, fn := range s.opts.ContextAttrFuncs {
 		attrs = append(attrs, fn(ctx)...)
 	}
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
 	r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
+	_ = s.handler.Handle(ctx, r)
 }
 
 func (s *slogLogger) Error(ctx context.Context, msg string, attrs ...interface{}) {
@@ -240,13 +255,13 @@ func (s *slogLogger) Error(ctx context.Context, msg string, attrs ...interface{}
 	}
 	var pcs [1]uintptr
 	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelError, msg, pcs[0])
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelError, msg, pcs[0])
 	for _, fn := range s.opts.ContextAttrFuncs {
 		attrs = append(attrs, fn(ctx)...)
 	}
-	for _, a := range attrs {
+	for idx, attr := range attrs {
-		if ve, ok := a.(error); ok && ve != nil {
+		if ve, ok := attr.(error); ok && ve != nil {
-			attrs = append(attrs, slog.String(s.opts.ErrorKey, ve.Error()))
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
 			break
 		}
 	}
@@ -269,7 +284,7 @@ func (s *slogLogger) Error(ctx context.Context, msg string, attrs ...interface{}
 		}
 		return true
 	})
-	_ = s.slog.Handler().Handle(ctx, r)
+	_ = s.handler.Handle(ctx, r)
 }
 
 func (s *slogLogger) Fatal(ctx context.Context, msg string, attrs ...interface{}) {
@@ -278,12 +293,18 @@ func (s *slogLogger) Fatal(ctx context.Context, msg string, attrs ...interface{}
 	}
 	var pcs [1]uintptr
 	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelError+1, msg, pcs[0])
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelError+1, msg, pcs[0])
 	for _, fn := range s.opts.ContextAttrFuncs {
 		attrs = append(attrs, fn(ctx)...)
 	}
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
 	r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
+	_ = s.handler.Handle(ctx, r)
 	os.Exit(1)
 }
 
@@ -293,12 +314,18 @@ func (s *slogLogger) Warn(ctx context.Context, msg string, attrs ...interface{})
 	}
 	var pcs [1]uintptr
 	runtime.Callers(s.opts.CallerSkipCount, pcs[:]) // skip [Callers, Infof]
-	r := slog.NewRecord(time.Now(), slog.LevelWarn, msg, pcs[0])
+	r := slog.NewRecord(s.opts.TimeFunc(), slog.LevelWarn, msg, pcs[0])
 	for _, fn := range s.opts.ContextAttrFuncs {
 		attrs = append(attrs, fn(ctx)...)
 	}
+	for idx, attr := range attrs {
+		if ve, ok := attr.(error); ok && ve != nil {
+			attrs[idx] = slog.String(s.opts.ErrorKey, ve.Error())
+			break
+		}
+	}
 	r.Add(attrs...)
-	_ = s.slog.Handler().Handle(ctx, r)
+	_ = s.handler.Handle(ctx, r)
 }
 
 func (s *slogLogger) Name() string {

logger/unwrap/unwrap.go

@@ -56,9 +56,9 @@ type Wrapper struct {
 	s                fmt.State
 	pointers         map[uintptr]int
 	opts             *Options
+	takeMap          map[int]bool
 	depth            int
 	ignoreNextType   bool
-	takeMap          map[int]bool
 	protoWrapperType bool
 	sqlWrapperType   bool
 }

metadata/context.go

@@ -17,11 +17,11 @@ func FromIncomingContext(ctx context.Context) (Metadata, bool) {
 	if ctx == nil {
 		return nil, false
 	}
-	md, ok := ctx.Value(mdIncomingKey{}).(*rawMetadata)
+	md, ok := ctx.Value(mdIncomingKey{}).(Metadata)
-	if !ok || md.md == nil {
+	if !ok || md == nil {
 		return nil, false
 	}
-	return md.md, ok
+	return md, ok
 }
 
 // FromOutgoingContext returns metadata from outgoing ctx
@@ -30,11 +30,11 @@ func FromOutgoingContext(ctx context.Context) (Metadata, bool) {
 	if ctx == nil {
 		return nil, false
 	}
-	md, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata)
+	md, ok := ctx.Value(mdOutgoingKey{}).(Metadata)
-	if !ok || md.md == nil {
+	if !ok || md == nil {
 		return nil, false
 	}
-	return md.md, ok
+	return md, ok
 }
 
 // FromContext returns metadata from the given context
@@ -43,11 +43,11 @@ func FromContext(ctx context.Context) (Metadata, bool) {
 	if ctx == nil {
 		return nil, false
 	}
-	md, ok := ctx.Value(mdKey{}).(*rawMetadata)
+	md, ok := ctx.Value(mdKey{}).(Metadata)
-	if !ok || md.md == nil {
+	if !ok || md == nil {
 		return nil, false
 	}
-	return md.md, ok
+	return md, ok
 }
 
 // NewContext creates a new context with the given metadata
@@ -55,45 +55,16 @@ func NewContext(ctx context.Context, md Metadata) context.Context {
 	if ctx == nil {
 		ctx = context.Background()
 	}
-	ctx = context.WithValue(ctx, mdKey{}, &rawMetadata{md})
+	ctx = context.WithValue(ctx, mdKey{}, md)
-	ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{})
-	ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{})
 	return ctx
 }
 
-// SetOutgoingContext modify outgoing context with given metadata
-func SetOutgoingContext(ctx context.Context, md Metadata) bool {
-	if ctx == nil {
-		return false
-	}
-	if omd, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata); ok {
-		omd.md = md
-		return true
-	}
-	return false
-}
-
-// SetIncomingContext modify incoming context with given metadata
-func SetIncomingContext(ctx context.Context, md Metadata) bool {
-	if ctx == nil {
-		return false
-	}
-	if omd, ok := ctx.Value(mdIncomingKey{}).(*rawMetadata); ok {
-		omd.md = md
-		return true
-	}
-	return false
-}
-
 // NewIncomingContext creates a new context with incoming metadata attached
 func NewIncomingContext(ctx context.Context, md Metadata) context.Context {
 	if ctx == nil {
 		ctx = context.Background()
 	}
-	ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{md})
+	ctx = context.WithValue(ctx, mdIncomingKey{}, md)
-	if v, ok := ctx.Value(mdOutgoingKey{}).(*rawMetadata); !ok || v == nil {
-		ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{})
-	}
 	return ctx
 }
 
@@ -102,41 +73,28 @@ func NewOutgoingContext(ctx context.Context, md Metadata) context.Context {
 	if ctx == nil {
 		ctx = context.Background()
 	}
-	ctx = context.WithValue(ctx, mdOutgoingKey{}, &rawMetadata{md})
+	ctx = context.WithValue(ctx, mdOutgoingKey{}, md)
-	if v, ok := ctx.Value(mdIncomingKey{}).(*rawMetadata); !ok || v == nil {
-		ctx = context.WithValue(ctx, mdIncomingKey{}, &rawMetadata{})
-	}
 	return ctx
 }
 
 // AppendOutgoingContext apends new md to context
 func AppendOutgoingContext(ctx context.Context, kv ...string) context.Context {
-	md, ok := Pairs(kv...)
+	md := Pairs(kv...)
-	if !ok {
-		return ctx
-	}
 	omd, ok := FromOutgoingContext(ctx)
 	if !ok {
 		return NewOutgoingContext(ctx, md)
 	}
-	for k, v := range md {
+	nmd := Merge(omd, md, true)
-		omd.Set(k, v)
+	return NewOutgoingContext(ctx, nmd)
-	}
-	return NewOutgoingContext(ctx, omd)
 }
 
 // AppendIncomingContext apends new md to context
 func AppendIncomingContext(ctx context.Context, kv ...string) context.Context {
-	md, ok := Pairs(kv...)
+	md := Pairs(kv...)
-	if !ok {
-		return ctx
-	}
 	omd, ok := FromIncomingContext(ctx)
 	if !ok {
 		return NewIncomingContext(ctx, md)
 	}
-	for k, v := range md {
+	nmd := Merge(omd, md, true)
-		omd.Set(k, v)
+	return NewIncomingContext(ctx, nmd)
-	}
-	return NewIncomingContext(ctx, omd)
 }

metadata/context_test.go

@@ -24,7 +24,7 @@ func TestNewNilContext(t *testing.T) {
 }
 
 func TestFromContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), mdKey{}, &rawMetadata{New(0)})
+	ctx := context.WithValue(context.TODO(), mdKey{}, New(0))
 
 	c, ok := FromContext(ctx)
 	if c == nil || !ok {
@@ -42,7 +42,7 @@ func TestNewContext(t *testing.T) {
 }
 
 func TestFromIncomingContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), mdIncomingKey{}, &rawMetadata{New(0)})
+	ctx := context.WithValue(context.TODO(), mdIncomingKey{}, New(0))
 
 	c, ok := FromIncomingContext(ctx)
 	if c == nil || !ok {
@@ -51,7 +51,7 @@ func TestFromIncomingContext(t *testing.T) {
 }
 
 func TestFromOutgoingContext(t *testing.T) {
-	ctx := context.WithValue(context.TODO(), mdOutgoingKey{}, &rawMetadata{New(0)})
+	ctx := context.WithValue(context.TODO(), mdOutgoingKey{}, New(0))
 
 	c, ok := FromOutgoingContext(ctx)
 	if c == nil || !ok {
@@ -59,36 +59,6 @@ func TestFromOutgoingContext(t *testing.T) {
 	}
 }
 
-func TestSetIncomingContext(t *testing.T) {
-	md := New(1)
-	md.Set("key", "val")
-	ctx := context.WithValue(context.TODO(), mdIncomingKey{}, &rawMetadata{})
-	if !SetIncomingContext(ctx, md) {
-		t.Fatal("SetIncomingContext not works")
-	}
-	md, ok := FromIncomingContext(ctx)
-	if md == nil || !ok {
-		t.Fatal("SetIncomingContext not works")
-	} else if v, ok := md.Get("key"); !ok || v != "val" {
-		t.Fatal("SetIncomingContext not works")
-	}
-}
-
-func TestSetOutgoingContext(t *testing.T) {
-	md := New(1)
-	md.Set("key", "val")
-	ctx := context.WithValue(context.TODO(), mdOutgoingKey{}, &rawMetadata{})
-	if !SetOutgoingContext(ctx, md) {
-		t.Fatal("SetOutgoingContext not works")
-	}
-	md, ok := FromOutgoingContext(ctx)
-	if md == nil || !ok {
-		t.Fatal("SetOutgoingContext not works")
-	} else if v, ok := md.Get("key"); !ok || v != "val" {
-		t.Fatal("SetOutgoingContext not works")
-	}
-}
-
 func TestNewIncomingContext(t *testing.T) {
 	md := New(1)
 	md.Set("key", "val")

metadata/metadata.go

@@ -1,9 +1,9 @@
 // Package metadata is a way of defining message headers
-package metadata // import "go.unistack.org/micro/v4/metadata"
+package metadata
 
 import (
 	"net/textproto"
-	"sort"
+	"strings"
 )
 
 var (
@@ -24,47 +24,7 @@ var (
 )
 
 // Metadata is our way of representing request headers internally.
-// They're used at the RPC level and translate back and forth
+type Metadata map[string][]string
-// from Transport headers.
-type Metadata map[string]string
-
-type rawMetadata struct {
-	md Metadata
-}
-
-// defaultMetadataSize used when need to init new Metadata
-var defaultMetadataSize = 2
-
-// Iterator used to iterate over metadata with order
-type Iterator struct {
-	md   Metadata
-	keys []string
-	cur  int
-	cnt  int
-}
-
-// Next advance iterator to next element
-func (iter *Iterator) Next(k, v *string) bool {
-	if iter.cur+1 > iter.cnt {
-		return false
-	}
-
-	*k = iter.keys[iter.cur]
-	*v = iter.md[*k]
-	iter.cur++
-	return true
-}
-
-// Iterator returns the itarator for metadata in sorted order
-func (md Metadata) Iterator() *Iterator {
-	iter := &Iterator{md: md, cnt: len(md)}
-	iter.keys = make([]string, 0, iter.cnt)
-	for k := range md {
-		iter.keys = append(iter.keys, k)
-	}
-	sort.Strings(iter.keys)
-	return iter
-}
 
 // Get returns value from metadata by key
 func (md Metadata) Get(key string) (string, bool) {
@@ -74,7 +34,7 @@ func (md Metadata) Get(key string) (string, bool) {
 		// slow path
 		val, ok = md[textproto.CanonicalMIMEHeaderKey(key)]
 	}
-	return val, ok
+	return strings.Join(val, ","), ok
 }
 
 // Set is used to store value in metadata
@@ -83,10 +43,19 @@ func (md Metadata) Set(kv ...string) {
 		kv = kv[:len(kv)-1]
 	}
 	for idx := 0; idx < len(kv); idx += 2 {
-		md[textproto.CanonicalMIMEHeaderKey(kv[idx])] = kv[idx+1]
+		md[textproto.CanonicalMIMEHeaderKey(kv[idx])] = []string{kv[idx+1]}
 	}
 }
 
+// Append is used to append value in metadata
+func (md Metadata) Append(k string, v ...string) {
+	if len(v) == 0 {
+		return
+	}
+	k = textproto.CanonicalMIMEHeaderKey(k)
+	md[k] = append(md[k], v...)
+}
+
 // Del is used to remove value from metadata
 func (md Metadata) Del(keys ...string) {
 	for _, key := range keys {
@@ -98,46 +67,52 @@ func (md Metadata) Del(keys ...string) {
 }
 
 // Copy makes a copy of the metadata
-func Copy(md Metadata) Metadata {
+func Copy(md Metadata, exclude ...string) Metadata {
-	nmd := New(len(md))
+	nmd := make(Metadata, len(md))
-	for key, val := range md {
+	for k, v := range md {
-		nmd.Set(key, val)
+		nmd[k] = v
 	}
+	nmd.Del(exclude...)
 	return nmd
 }
 
 // New return new sized metadata
 func New(size int) Metadata {
 	if size == 0 {
-		size = defaultMetadataSize
+		size = 2
 	}
 	return make(Metadata, size)
 }
 
 // Merge merges metadata to existing metadata, overwriting if specified
 func Merge(omd Metadata, mmd Metadata, overwrite bool) Metadata {
-	var ok bool
 	nmd := Copy(omd)
 	for key, val := range mmd {
-		_, ok = nmd[key]
+		nval, ok := nmd[key]
 		switch {
+		case ok && overwrite:
+			nmd[key] = nval
+			continue
 		case ok && !overwrite:
 			continue
-		case val != "":
+		case !ok:
-			nmd.Set(key, val)
+			for _, v := range val {
-		case ok && val == "":
+				if v != "" {
-			nmd.Del(key)
+					nval = append(nval, v)
+				}
+			}
+			nmd[key] = nval
 		}
 	}
 	return nmd
 }
 
 // Pairs from which metadata created
-func Pairs(kv ...string) (Metadata, bool) {
+func Pairs(kv ...string) Metadata {
 	if len(kv)%2 == 1 {
-		return nil, false
+		kv = kv[:len(kv)-1]
 	}
-	md := New(len(kv) / 2)
+	md := make(Metadata, len(kv)/2)
 	md.Set(kv...)
-	return md, true
+	return md
 }

metadata/metadata_test.go

@@ -33,30 +33,52 @@ func TestAppend(t *testing.T) {
 }
 
 func TestPairs(t *testing.T) {
-	md, ok := Pairs("key1", "val1", "key2", "val2")
+	md := Pairs("key1", "val1", "key2", "val2")
-	if !ok {
+
-		t.Fatal("odd number of kv")
+	if _, ok := md.Get("key1"); !ok {
-	}
-	if _, ok = md.Get("key1"); !ok {
 		t.Fatal("key1 not found")
 	}
 }
 
-func testCtx(ctx context.Context) {
+func testIncomingCtx(ctx context.Context) {
-	md := New(2)
+	if md, ok := FromIncomingContext(ctx); ok && md != nil {
-	md.Set("Key1", "Val1_new")
+		md.Set("Key1", "Val1_new")
-	md.Set("Key3", "Val3")
+		md.Set("Key3", "Val3")
-	SetOutgoingContext(ctx, md)
+	}
 }
 
-func TestPassing(t *testing.T) {
+func testOutgoingCtx(ctx context.Context) {
+	if md, ok := FromOutgoingContext(ctx); ok && md != nil {
+		md.Set("Key1", "Val1_new")
+		md.Set("Key3", "Val3")
+	}
+}
+
+func TestIncoming(t *testing.T) {
 	ctx := context.TODO()
 	md1 := New(2)
 	md1.Set("Key1", "Val1")
 	md1.Set("Key2", "Val2")
 
 	ctx = NewIncomingContext(ctx, md1)
-	testCtx(ctx)
+	testIncomingCtx(ctx)
+	md, ok := FromIncomingContext(ctx)
+	if !ok {
+		t.Fatalf("missing metadata from incoming context")
+	}
+	if v, ok := md.Get("Key1"); !ok || v != "Val1_new" {
+		t.Fatalf("invalid metadata value %#+v", md)
+	}
+}
+
+func TestOutgoing(t *testing.T) {
+	ctx := context.TODO()
+	md1 := New(2)
+	md1.Set("Key1", "Val1")
+	md1.Set("Key2", "Val2")
+
+	ctx = NewOutgoingContext(ctx, md1)
+	testOutgoingCtx(ctx)
 	md, ok := FromOutgoingContext(ctx)
 	if !ok {
 		t.Fatalf("missing metadata from outgoing context")
@@ -68,10 +90,10 @@ func TestPassing(t *testing.T) {
 
 func TestMerge(t *testing.T) {
 	omd := Metadata{
-		"key1": "val1",
+		"key1": []string{"val1"},
 	}
 	mmd := Metadata{
-		"key2": "val2",
+		"key2": []string{"val2"},
 	}
 
 	nmd := Merge(omd, mmd, true)
@@ -80,21 +102,6 @@ func TestMerge(t *testing.T) {
 	}
 }
 
-func TestIterator(t *testing.T) {
-	md := Metadata{
-		"1Last":   "last",
-		"2First":  "first",
-		"3Second": "second",
-	}
-
-	iter := md.Iterator()
-	var k, v string
-
-	for iter.Next(&k, &v) {
-		// fmt.Printf("k: %s, v: %s\n", k, v)
-	}
-}
-
 func TestMedataCanonicalKey(t *testing.T) {
 	md := New(1)
 	md.Set("x-request-id", "12345")
@@ -134,10 +141,7 @@ func TestMetadataSet(t *testing.T) {
 }
 
 func TestMetadataDelete(t *testing.T) {
-	md := Metadata{
+	md := Pairs("Foo", "bar", "Baz", "empty")
-		"Foo": "bar",
-		"Baz": "empty",
-	}
 
 	md.Del("Baz")
 	_, ok := md.Get("Baz")
@@ -156,24 +160,19 @@ func TestNilContext(t *testing.T) {
 }
 
 func TestMetadataCopy(t *testing.T) {
-	md := Metadata{
+	md := Pairs("Foo", "bar", "Bar", "baz")
-		"Foo": "bar",
-		"Bar": "baz",
-	}
 
 	cp := Copy(md)
 
 	for k, v := range md {
-		if cv := cp[k]; cv != v {
+		if cv := cp[k]; len(cv) != len(v) {
 			t.Fatalf("Got %s:%s for %s:%s", k, cv, k, v)
 		}
 	}
 }
 
 func TestMetadataContext(t *testing.T) {
-	md := Metadata{
+	md := Pairs("Foo", "bar")
-		"Foo": "bar",
-	}
 
 	ctx := NewContext(context.TODO(), md)
 
@@ -182,7 +181,7 @@ func TestMetadataContext(t *testing.T) {
 		t.Errorf("Unexpected error retrieving metadata, got %t", ok)
 	}
 
-	if emd["Foo"] != md["Foo"] {
+	if len(emd["Foo"]) != len(md["Foo"]) {
 		t.Errorf("Expected key: %s val: %s, got key: %s val: %s", "Foo", md["Foo"], "Foo", emd["Foo"])
 	}
 
@@ -190,3 +189,14 @@ func TestMetadataContext(t *testing.T) {
 		t.Errorf("Expected metadata length 1 got %d", i)
 	}
 }
+
+func TestCopy(t *testing.T) {
+	md := New(2)
+	md.Set("key1", "val1", "key2", "val2")
+	nmd := Copy(md, "key2")
+	if len(nmd) != 1 {
+		t.Fatal("Copy exclude not works")
+	} else if nmd["Key1"][0] != "val1" {
+		t.Fatal("Copy exclude not works")
+	}
+}

micro.go

@@ -65,6 +65,8 @@ func As(b any, target any) bool {
 			break
 		case targetType.Implements(routerType):
 			break
+		case targetType.Implements(tracerType):
+			break
 		default:
 			return false
 		}
@@ -76,19 +78,21 @@ func As(b any, target any) bool {
 	return false
 }
 
-var brokerType = reflect.TypeOf((*broker.Broker)(nil)).Elem()
+var (
-var loggerType = reflect.TypeOf((*logger.Logger)(nil)).Elem()
+	brokerType   = reflect.TypeOf((*broker.Broker)(nil)).Elem()
-var clientType = reflect.TypeOf((*client.Client)(nil)).Elem()
+	loggerType   = reflect.TypeOf((*logger.Logger)(nil)).Elem()
-var serverType = reflect.TypeOf((*server.Server)(nil)).Elem()
+	clientType   = reflect.TypeOf((*client.Client)(nil)).Elem()
-var codecType = reflect.TypeOf((*codec.Codec)(nil)).Elem()
+	serverType   = reflect.TypeOf((*server.Server)(nil)).Elem()
-var flowType = reflect.TypeOf((*flow.Flow)(nil)).Elem()
+	codecType    = reflect.TypeOf((*codec.Codec)(nil)).Elem()
-var fsmType = reflect.TypeOf((*fsm.FSM)(nil)).Elem()
+	flowType     = reflect.TypeOf((*flow.Flow)(nil)).Elem()
-var meterType = reflect.TypeOf((*meter.Meter)(nil)).Elem()
+	fsmType      = reflect.TypeOf((*fsm.FSM)(nil)).Elem()
-var registerType = reflect.TypeOf((*register.Register)(nil)).Elem()
+	meterType    = reflect.TypeOf((*meter.Meter)(nil)).Elem()
-var resolverType = reflect.TypeOf((*resolver.Resolver)(nil)).Elem()
+	registerType = reflect.TypeOf((*register.Register)(nil)).Elem()
-var routerType = reflect.TypeOf((*router.Router)(nil)).Elem()
+	resolverType = reflect.TypeOf((*resolver.Resolver)(nil)).Elem()
-var selectorType = reflect.TypeOf((*selector.Selector)(nil)).Elem()
+	routerType   = reflect.TypeOf((*router.Router)(nil)).Elem()
-var storeType = reflect.TypeOf((*store.Store)(nil)).Elem()
+	selectorType = reflect.TypeOf((*selector.Selector)(nil)).Elem()
-var syncType = reflect.TypeOf((*sync.Sync)(nil)).Elem()
+	storeType    = reflect.TypeOf((*store.Store)(nil)).Elem()
-var tracerType = reflect.TypeOf((*tracer.Tracer)(nil)).Elem()
+	syncType     = reflect.TypeOf((*sync.Sync)(nil)).Elem()
-var serviceType = reflect.TypeOf((*Service)(nil)).Elem()
+	tracerType   = reflect.TypeOf((*tracer.Tracer)(nil)).Elem()
+	serviceType  = reflect.TypeOf((*Service)(nil)).Elem()
+)

options/options.go

@@ -158,17 +158,28 @@ func Metadata(md ...any) Option {
 		case metadata.Metadata:
 			result = metadata.Copy(vt)
 		case map[string]string:
+			result = make(metadata.Metadata, len(vt))
+			for k, v := range vt {
+				result.Set(k, v)
+			}
+		case map[string][]string:
 			result = metadata.Copy(vt)
 		default:
 			result = metadata.New(0)
 		}
 	} else {
 		result = metadata.New(len(md) / 2)
-		for idx := 0; idx < len(md)/2; idx += 2 {
+		for idx := 0; idx <= len(md)/2; idx += 2 {
-			k, kok := md[idx].(string)
+			k, ok := md[idx].(string)
-			v, vok := md[idx+1].(string)
+			switch vt := md[idx+1].(type) {
-			if kok && vok {
+			case string:
-				result.Set(k, v)
+				if ok {
+					result.Set(k, vt)
+				}
+			case []string:
+				if ok {
+					result.Append(k, vt...)
+				}
 			}
 		}
 	}

options/options_test.go

@@ -1,7 +1,6 @@
 package options_test
 
 import (
-	"fmt"
 	"testing"
 
 	"go.unistack.org/micro/v4/codec"
@@ -100,40 +99,29 @@ func TestMetadataAny(t *testing.T) {
 	}{
 		{
 			"strings_even",
-			[]any{"key1", "val1", "key2", "val2"},
+			[]any{"Strkey1", []string{"val1"}, "Strkey2", []string{"val2"}},
-			metadata.Metadata{
+			metadata.Pairs("Strkey1", "val1", "Strkey2", "val2"),
-				"Key1": "val1",
-				"Key2": "val2",
-			},
 		},
 		{
 			"strings_odd",
 			[]any{"key1", "val1", "key2"},
-			metadata.Metadata{
+			metadata.Pairs("Key1", "val1"),
-				"Key1": "val1",
-			},
 		},
 		{
 			Name: "map",
-			Data: map[string]string{
+			Data: map[string][]string{
-				"key1": "val1",
+				"Mapkey1": {"val1"},
-				"key2": "val2",
+				"Mapkey2": {"val2"},
 			},
 			Expected: metadata.Metadata{
-				"Key1": "val1",
+				"Mapkey1": []string{"val1"},
-				"Key2": "val2",
+				"Mapkey2": []string{"val2"},
 			},
 		},
 		{
 			"metadata.Metadata",
-			metadata.Metadata{
+			metadata.Pairs("key1", "val1", "key2", "val2"),
-				"key1": "val1",
+			metadata.Pairs("Key1", "val1", "Key2", "val2"),
-				"key2": "val2",
-			},
-			metadata.Metadata{
-				"Key1": "val1",
-				"Key2": "val2",
-			},
 		},
 	}
 
@@ -144,7 +132,7 @@ func TestMetadataAny(t *testing.T) {
 			switch valData := tt.Data.(type) {
 			case []any:
 				opts = append(opts, options.Metadata(valData...))
-			case map[string]string, metadata.Metadata:
+			case map[string]string, map[string][]string, metadata.Metadata:
 				opts = append(opts, options.Metadata(valData))
 			}
 
@@ -153,7 +141,7 @@ func TestMetadataAny(t *testing.T) {
 					t.Fatal(err)
 				}
 				if !reflect.Equal(tt.Expected, src.Metadata) {
-					t.Fatal(fmt.Sprintf("expected: %v, actual: %v", tt.Expected, src.Metadata))
+					t.Fatalf("expected: %v, actual: %v", tt.Expected, src.Metadata)
 				}
 			}
 		})

register/memory/memory.go

@@ -2,10 +2,12 @@ package memory
 
 import (
 	"context"
-	"go.unistack.org/micro/v4/register"
 	"sync"
 	"time"
 
+	"go.unistack.org/micro/v4/metadata"
+	"go.unistack.org/micro/v4/register"
+
 	"go.unistack.org/micro/v4/logger"
 	"go.unistack.org/micro/v4/util/id"
 )
@@ -24,16 +26,16 @@ type node struct {
 type record struct {
 	Name      string
 	Version   string
-	Metadata  map[string]string
+	Metadata  metadata.Metadata
 	Nodes     map[string]*node
 	Endpoints []*register.Endpoint
 }
 
 type memory struct {
-	sync.RWMutex
 	records  map[string]services
 	watchers map[string]*watcher
 	opts     register.Options
+	sync.RWMutex
 }
 
 // services is a KV map with service name as the key and a map of records as the value
@@ -100,10 +102,20 @@ func (m *memory) sendEvent(r *register.Result) {
 }
 
 func (m *memory) Connect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
 	return nil
 }
 
 func (m *memory) Disconnect(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
 	return nil
 }
 
@@ -124,6 +136,11 @@ func (m *memory) Options() register.Options {
 }
 
 func (m *memory) Register(ctx context.Context, s *register.Service, opts ...register.RegisterOption) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
 	m.Lock()
 	defer m.Unlock()
 
@@ -137,11 +154,11 @@ func (m *memory) Register(ctx context.Context, s *register.Service, opts ...regi
 
 	// domain is set in metadata so it can be passed to watchers
 	if s.Metadata == nil {
-		s.Metadata = map[string]string{"domain": options.Domain}
+		s.Metadata = metadata.New(0)
-	} else {
-		s.Metadata["domain"] = options.Domain
 	}
 
+	s.Metadata.Set("domain", options.Domain)
+
 	// ensure the service name exists
 	r := serviceToRecord(s, options.TTL)
 	if _, ok := srvs[s.Name]; !ok {
@@ -165,15 +182,8 @@ func (m *memory) Register(ctx context.Context, s *register.Service, opts ...regi
 			continue
 		}
 
-		metadata := make(map[string]string, len(n.Metadata))
+		metadata := metadata.Copy(n.Metadata)
-
+		metadata.Set("domain", options.Domain)
-		// make copy of metadata
-		for k, v := range n.Metadata {
-			metadata[k] = v
-		}
-
-		// set the domain
-		metadata["domain"] = options.Domain
 
 		// add the node
 		srvs[s.Name][s.Version].Nodes[n.ID] = &node{
@@ -217,10 +227,9 @@ func (m *memory) Deregister(ctx context.Context, s *register.Service, opts ...re
 
 	// domain is set in metadata so it can be passed to watchers
 	if s.Metadata == nil {
-		s.Metadata = map[string]string{"domain": options.Domain}
+		s.Metadata = metadata.New(0)
-	} else {
-		s.Metadata["domain"] = options.Domain
 	}
+	s.Metadata.Set("domain", options.Domain)
 
 	// if the domain doesn't exist, there is nothing to deregister
 	services, ok := m.records[options.Domain]
@@ -425,16 +434,24 @@ func (m *watcher) Next() (*register.Result, error) {
 				continue
 			}
 
+			if m.wo.Domain == register.WildcardDomain {
+				return r, nil
+			}
+
+			if r.Service.Metadata == nil {
+				continue
+			}
+
 			// extract domain from service metadata
 			var domain string
-			if r.Service.Metadata != nil && len(r.Service.Metadata["domain"]) > 0 {
+			if v, ok := r.Service.Metadata.Get("domain"); ok && v != "" {
-				domain = r.Service.Metadata["domain"]
+				domain = v
 			} else {
 				domain = register.DefaultDomain
 			}
 
 			// only send the event if watching the wildcard or this specific domain
-			if m.wo.Domain == register.WildcardDomain || m.wo.Domain == domain {
+			if m.wo.Domain == domain {
 				return r, nil
 			}
 		case <-m.exit:
@@ -453,10 +470,7 @@ func (m *watcher) Stop() {
 }
 
 func serviceToRecord(s *register.Service, ttl time.Duration) *record {
-	metadata := make(map[string]string, len(s.Metadata))
+	metadata := metadata.Copy(s.Metadata)
-	for k, v := range s.Metadata {
-		metadata[k] = v
-	}
 
 	nodes := make(map[string]*node, len(s.Nodes))
 	for _, n := range s.Nodes {
@@ -468,9 +482,7 @@ func serviceToRecord(s *register.Service, ttl time.Duration) *record {
 	}
 
 	endpoints := make([]*register.Endpoint, len(s.Endpoints))
-	for i, e := range s.Endpoints { // TODO: vtolstov use copy
+	copy(endpoints, s.Endpoints)
-		endpoints[i] = e
-	}
 
 	return &record{
 		Name:      s.Name,
@@ -482,20 +494,11 @@ func serviceToRecord(s *register.Service, ttl time.Duration) *record {
 }
 
 func recordToService(r *record, domain string) *register.Service {
-	metadata := make(map[string]string, len(r.Metadata))
-	for k, v := range r.Metadata {
-		metadata[k] = v
-	}
-
-	// set the domain in metadata so it can be determined when a wildcard query is performed
-	metadata["domain"] = domain
-
 	endpoints := make([]*register.Endpoint, len(r.Endpoints))
 	for i, e := range r.Endpoints {
-		md := make(map[string]string, len(e.Metadata))
+		md := metadata.Copy(e.Metadata)
-		for k, v := range e.Metadata {
+		// set the domain in metadata so it can be determined when a wildcard query is performed
-			md[k] = v
+		md.Set("domain", domain)
-		}
 
 		endpoints[i] = &register.Endpoint{
 			Name:     e.Name,
@@ -508,15 +511,10 @@ func recordToService(r *record, domain string) *register.Service {
 	nodes := make([]*register.Node, len(r.Nodes))
 	i := 0
 	for _, n := range r.Nodes {
-		md := make(map[string]string, len(n.Metadata))
-		for k, v := range n.Metadata {
-			md[k] = v
-		}
-
 		nodes[i] = &register.Node{
 			ID:       n.ID,
 			Address:  n.Address,
-			Metadata: md,
+			Metadata: metadata.Copy(n.Metadata),
 		}
 		i++
 	}
@@ -524,7 +522,7 @@ func recordToService(r *record, domain string) *register.Service {
 	return &register.Service{
 		Name:      r.Name,
 		Version:   r.Version,
-		Metadata:  metadata,
+		Metadata:  metadata.Copy(r.Metadata),
 		Endpoints: endpoints,
 		Nodes:     nodes,
 	}

register/memory/memory_test.go

@@ -3,12 +3,13 @@ package memory
 import (
 	"context"
 	"fmt"
-	"go.unistack.org/micro/v4"
-	"go.unistack.org/micro/v4/register"
 	"reflect"
 	"sync"
 	"testing"
 	"time"
+
+	"go.unistack.org/micro/v4"
+	"go.unistack.org/micro/v4/register"
 )
 
 var testData = map[string][]*register.Service{
@@ -209,9 +210,9 @@ func TestMemoryRegistryTTLConcurrent(t *testing.T) {
 		}
 	}
 
-	//if len(os.Getenv("IN_TRAVIS_CI")) == 0 {
+	// if len(os.Getenv("IN_TRAVIS_CI")) == 0 {
 	//	t.Logf("test will wait %v, then check TTL timeouts", waitTime)
-	//}
+	// }
 
 	errChan := make(chan error, concurrency)
 	syncChan := make(chan struct{})
@@ -252,6 +253,13 @@ func TestMemoryWildcard(t *testing.T) {
 	m := NewRegister()
 	ctx := context.TODO()
 
+	if err := m.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := m.Connect(ctx); err != nil {
+		t.Fatal(err)
+	}
 	testSrv := &register.Service{Name: "foo", Version: "1.0.0"}
 
 	if err := m.Register(ctx, testSrv, register.RegisterDomain("one")); err != nil {
@@ -291,8 +299,12 @@ func TestWatcher(t *testing.T) {
 
 	ctx := context.TODO()
 	m := NewRegister()
-	m.Init()
+	if err := m.Init(); err != nil {
-	m.Connect(ctx)
+		t.Fatal(err)
+	}
+	if err := m.Connect(ctx); err != nil {
+		t.Fatal(err)
+	}
 	wc, err := m.Watch(ctx)
 	if err != nil {
 		t.Fatalf("cant watch: %v", err)

semconv/broker.go

@@ -17,4 +17,6 @@ var (
 	SubscribeMessageTotal = "subscribe_message_total"
 	// SubscribeMessageInflight specifies meter metric name
 	SubscribeMessageInflight = "subscribe_message_inflight"
+	// BrokerGroupLag specifies broker lag
+	BrokerGroupLag = "broker_lag"
 )

semconv/cache.go

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

server/noop.go

@@ -112,8 +112,8 @@ func (n *noopServer) Register() error {
 	}
 	n.RUnlock()
 
-	service.Nodes[0].Metadata["protocol"] = "noop"
+	service.Nodes[0].Metadata.Set("protocol", "noop")
-	service.Nodes[0].Metadata["transport"] = service.Nodes[0].Metadata["protocol"]
+	service.Nodes[0].Metadata.Set("transport", "noop")
 	service.Endpoints = endpoints
 
 	n.RLock()

server/options.go

@@ -13,6 +13,7 @@ import (
 	"go.unistack.org/micro/v4/meter"
 	"go.unistack.org/micro/v4/options"
 	"go.unistack.org/micro/v4/register"
+	msync "go.unistack.org/micro/v4/sync"
 	"go.unistack.org/micro/v4/tracer"
 	"go.unistack.org/micro/v4/util/id"
 )
@@ -32,7 +33,7 @@ type Options struct {
 	// Listener may be passed if already created
 	Listener net.Listener
 	// Wait group
-	Wait *sync.WaitGroup
+	Wait *msync.WaitGroup
 	// TLSConfig specifies tls.Config for secure serving
 	TLSConfig *tls.Config
 	// Metadata holds the server metadata
@@ -146,8 +147,11 @@ func Wait(wg *sync.WaitGroup) options.Option {
 	if wg == nil {
 		wg = new(sync.WaitGroup)
 	}
+
+	wrap := msync.WrapWaitGroup(wg)
+
 	return func(src interface{}) error {
-		return options.Set(src, wg, ".Wait")
+		return options.Set(src, wrap, ".Wait")
 	}
 }
 

server/registry.go

@@ -77,8 +77,8 @@ func NewRegisterService(s Server) (*register.Service, error) {
 	}
 	node.Metadata = metadata.Copy(opts.Metadata)
 
-	node.Metadata["server"] = s.String()
+	node.Metadata.Set("server", s.String())
-	node.Metadata["register"] = opts.Register.String()
+	node.Metadata.Set("register", opts.Register.String())
 
 	return &register.Service{
 		Name:     opts.Name,

sync/waitgroup.go

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

sync/waitgroup_test.go

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

tracer/options.go

@@ -171,7 +171,8 @@ func NewEventOptions(opts ...options.Option) EventOptions {
 // NewOptions returns default options
 func NewOptions(opts ...options.Option) Options {
 	options := Options{
-		Logger: logger.DefaultLogger,
+		Logger:  logger.DefaultLogger,
+		Context: context.Background(),
 	}
 	for _, o := range opts {
 		o(&options)

tracer/tracer.go

@@ -1,10 +1,8 @@
 // Package tracer provides an interface for distributed tracing
-package tracer // import "go.unistack.org/micro/v4/tracer"
+package tracer
 
 import (
 	"context"
-	"fmt"
-	"sort"
 
 	"go.unistack.org/micro/v4/logger"
 	"go.unistack.org/micro/v4/options"
@@ -71,37 +69,3 @@ type Span interface {
 	// SpanID returns span id
 	SpanID() string
 }
-
-// sort labels alphabeticaly by label name
-type byKey []interface{}
-
-func (k byKey) Len() int           { return len(k) / 2 }
-func (k byKey) Less(i, j int) bool { return fmt.Sprintf("%s", k[i*2]) < fmt.Sprintf("%s", k[j*2]) }
-func (k byKey) Swap(i, j int) {
-	k[i*2], k[j*2] = k[j*2], k[i*2]
-	k[i*2+1], k[j*2+1] = k[j*2+1], k[i*2+1]
-}
-
-func UniqLabels(labels []interface{}) []interface{} {
-	if len(labels)%2 == 1 {
-		labels = labels[:len(labels)-1]
-	}
-
-	if len(labels) > 2 {
-		sort.Sort(byKey(labels))
-
-		idx := 0
-		for {
-			if labels[idx] == labels[idx+2] {
-				copy(labels[idx:], labels[idx+2:])
-				labels = labels[:len(labels)-2]
-			} else {
-				idx += 2
-			}
-			if idx+2 >= len(labels) {
-				break
-			}
-		}
-	}
-	return labels
-}

util/reflect/reflect.go

@@ -1,6 +1,7 @@
-package reflect // import "go.unistack.org/micro/v4/util/reflect"
+package reflect
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"reflect"
@@ -45,15 +46,23 @@ func SliceAppend(b bool) Option {
 
 // Merge merges map[string]interface{} to destination struct
 func Merge(dst interface{}, mp map[string]interface{}, opts ...Option) error {
-	var err error
-	var sval reflect.Value
-	var fname string
-
 	options := Options{}
 	for _, o := range opts {
 		o(&options)
 	}
 
+	if unmarshaler, ok := dst.(json.Unmarshaler); ok {
+		buf, err := json.Marshal(mp)
+		if err == nil {
+			err = unmarshaler.UnmarshalJSON(buf)
+		}
+		return err
+	}
+
+	var err error
+	var sval reflect.Value
+	var fname string
+
 	dviface := reflect.ValueOf(dst)
 	if dviface.Kind() == reflect.Ptr {
 		dviface = dviface.Elem()
@@ -532,6 +541,9 @@ func Equal(src interface{}, dst interface{}, excptFields ...string) bool {
 			}
 			s := srcVal.MapIndex(key)
 			d := dstVal.MapIndex(key)
+			if !s.IsValid() || !d.IsValid() {
+				return false
+			}
 			if !Equal(s.Interface(), d.Interface(), excptFields...) {
 				return false
 			}

util/register/util.go

@@ -109,12 +109,11 @@ func Merge(olist []*register.Service, nlist []*register.Service) []*register.Ser
 				seen = true
 				srv = append(srv, sp)
 				break
-			} else {
-				sp := &register.Service{}
-				// make copy
-				*sp = *o
-				srv = append(srv, sp)
 			}
+			sp := &register.Service{}
+			// make copy
+			*sp = *o
+			srv = append(srv, sp)
 		}
 		if !seen {
 			srv = append(srv, Copy([]*register.Service{n})...)

util/sort/sort.go

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

util/structfs/metadata_ec2.go

@@ -12,7 +12,7 @@ type EC2Metadata struct {
 			InstanceType       string   `json:"instance-type"`
 			LocalHostname      string   `json:"local-hostname"`
 			LocalIPv4          string   `json:"local-ipv4"`
-			kernelID           int      `json:"kernel-id"`
+			KernelID           int      `json:"kernel-id"`
 			Placement          string   `json:"placement"`
 			AvailabilityZone   string   `json:"availability-zone"`
 			ProductCodes       string   `json:"product-codes"`

util/structfs/structfs.go

@@ -67,9 +67,9 @@ func (fi *fileInfo) Name() string {
 
 func (fi *fileInfo) Mode() os.FileMode {
 	if strings.HasSuffix(fi.name, "/") {
-		return os.FileMode(0755) | os.ModeDir
+		return os.FileMode(0o755) | os.ModeDir
 	}
-	return os.FileMode(0644)
+	return os.FileMode(0o644)
 }
 
 func (fi *fileInfo) IsDir() bool {
@@ -112,15 +112,14 @@ func (f *file) Readdir(count int) ([]os.FileInfo, error) {
 func (f *file) Seek(offset int64, whence int) (int64, error) {
 	//	log.Printf("seek %d %d %s\n", offset, whence, f.name)
 	switch whence {
-	case os.SEEK_SET:
+	case io.SeekStart:
 		f.offset = offset
-	case os.SEEK_CUR:
+	case io.SeekCurrent:
 		f.offset += offset
-	case os.SEEK_END:
+	case io.SeekEnd:
 		f.offset = int64(len(f.data)) + offset
 	}
 	return f.offset, nil
-
 }
 
 func (f *file) Stat() (os.FileInfo, error) {

util/structfs/structfs_test.go

@@ -2,7 +2,7 @@ package structfs
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"reflect"
 	"testing"
@@ -82,7 +82,7 @@ func get(path string) ([]byte, error) {
 		return nil, err
 	}
 	defer res.Body.Close()
-	return ioutil.ReadAll(res.Body)
+	return io.ReadAll(res.Body)
 }
 
 func TestAll(t *testing.T) {

util/time/duration_test.go

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

util/xpool/pool.go

@@ -0,0 +1,25 @@
+package pool
+
+import "sync"
+
+type Pool[T any] struct {
+	p *sync.Pool
+}
+
+func NewPool[T any](fn func() T) Pool[T] {
+	return Pool[T]{
+		p: &sync.Pool{
+			New: func() interface{} {
+				return fn()
+			},
+		},
+	}
+}
+
+func (p Pool[T]) Get() T {
+	return p.p.Get().(T)
+}
+
+func (p Pool[T]) Put(t T) {
+	p.p.Put(t)
+}

util/xpool/pool_test.go

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