Repository: go-kratos/kratos
Pull request #2277 (2022-08-15 10:31:24)

refactor: unify selector filter
```go
client:
- WithNodeFilter(... NodeFilter)

selector:
- GlobalSelector(Builder)
- SetGlobalSelector(Builder)
```


Patch:
diff --git a/contrib/registry/servicecomb/README.md b/contrib/registry/servicecomb/README.md
new file mode 100644
index 00000000..ea48cb93
--- /dev/null
+++ b/contrib/registry/servicecomb/README.md
@@ -0,0 +1,67 @@
+# Servicecomb Registry
+
+## example
+### server
+```go
+package main
+
+import (
+	"log"
+
+	"github.com/go-chassis/sc-client"
+	"github.com/go-kratos/kratos/contrib/registry/servicecomb/v2"
+	"github.com/go-kratos/kratos/v2"
+)
+
+func main() {
+	c, err := sc.NewClient(sc.Options{
+		Endpoints: []string{"127.0.0.1:30100"},
+	})
+	if err != nil {
+		log.Panic(err)
+	}
+	r := servicecomb.NewRegistry(c)
+	app := kratos.New(
+		kratos.Name("helloServicecomb"),
+		kratos.Registrar(r),
+	)
+	if err := app.Run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+```
+### client
+```go
+package main
+
+import (
+	"context"
+	"log"
+
+	"github.com/go-chassis/sc-client"
+	"github.com/go-kratos/kratos/contrib/registry/servicecomb/v2"
+	"github.com/go-kratos/kratos/v2/transport/grpc"
+)
+
+func main() {
+	c, err := sc.NewClient(sc.Options{
+		Endpoints: []string{"127.0.0.1:30100"},
+	})
+	if err != nil {
+		log.Panic(err)
+	}
+	r := servicecomb.NewRegistry(c)
+	ctx := context.Background()
+	conn, err := grpc.DialInsecure(
+		ctx,
+		grpc.WithEndpoint("discovery:///helloServicecomb"),
+		grpc.WithDiscovery(r),
+	)
+	if err != nil {
+		return
+	}
+	defer conn.Close()
+}
+
+```
\ No newline at end of file
diff --git a/contrib/registry/servicecomb/go.mod b/contrib/registry/servicecomb/go.mod
new file mode 100644
index 00000000..43661281
--- /dev/null
+++ b/contrib/registry/servicecomb/go.mod
@@ -0,0 +1,15 @@
+module github.com/go-kratos/kratos/contrib/registry/servicecomb/v2
+
+go 1.16
+
+require (
+	github.com/go-chassis/cari v0.6.0
+	github.com/go-chassis/sc-client v0.6.1-0.20210615014358-a45e9090c751
+	github.com/go-kratos/kratos/v2 v2.3.1
+	github.com/gofrs/uuid v4.2.0+incompatible
+)
+
+require (
+	github.com/stretchr/testify v1.7.1
+	golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4
+)
diff --git a/contrib/registry/servicecomb/go.sum b/contrib/registry/servicecomb/go.sum
new file mode 100644
index 00000000..738943db
--- /dev/null
+++ b/contrib/registry/servicecomb/go.sum
@@ -0,0 +1,737 @@
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+k8s.io/api v0.17.0/go.mod h1:npsyOePkeP0CPwyGfXDHxvypiYMJxBWAMpQxCaJ4ZxI=
+k8s.io/apimachinery v0.17.0/go.mod h1:b9qmWdKlLuU9EBh+06BtLcSf/Mu89rWL33naRxs1uZg=
+k8s.io/client-go v0.17.0/go.mod h1:TYgR6EUHs6k45hb6KWjVD6jFZvJV4gHDikv/It0xz+k=
+k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
+k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
+k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
+k8s.io/klog v1.0.0/go.mod h1:4Bi6QPql/J/LkTDqv7R/cd3hPo4k2DG6Ptcz060Ez5I=
+k8s.io/kube-openapi v0.0.0-20191107075043-30be4d16710a/go.mod h1:1TqjTSzOxsLGIKfj0lK8EeCP7K1iUG65v09OM0/WG5E=
+k8s.io/utils v0.0.0-20191114184206-e782cd3c129f/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
diff --git a/contrib/registry/servicecomb/registry.go b/contrib/registry/servicecomb/registry.go
new file mode 100644
index 00000000..7dd388c9
--- /dev/null
+++ b/contrib/registry/servicecomb/registry.go
@@ -0,0 +1,174 @@
+package servicecomb
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"time"
+
+	"github.com/go-chassis/cari/discovery"
+	pb "github.com/go-chassis/cari/discovery"
+	"github.com/go-chassis/cari/pkg/errsvc"
+	"github.com/go-chassis/sc-client"
+
+	"github.com/go-kratos/kratos/v2/log"
+	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/gofrs/uuid"
+)
+
+func init() {
+	appID = os.Getenv(appIDVar)
+	if appID == "" {
+		appID = "default"
+	}
+	env = os.Getenv(envVar)
+}
+
+var (
+	_ registry.Registrar = (*Registry)(nil)
+	_ registry.Discovery = (*Registry)(nil)
+)
+
+var (
+	curServiceID string
+	appID        string
+	env          string
+)
+
+const (
+	appIDKey         = "appId"
+	envKey           = "environment"
+	envVar           = "CAS_ENVIRONMENT_ID"
+	appIDVar         = "CAS_APPLICATION_NAME"
+	frameWorkName    = "kratos"
+	frameWorkVersion = "v2"
+)
+
+type RegistryClient interface {
+	GetMicroServiceID(appID, microServiceName, version, env string, opts ...sc.CallOption) (string, error)
+	FindMicroServiceInstances(consumerID, appID, microServiceName, versionRule string, opts ...sc.CallOption) ([]*discovery.MicroServiceInstance, error)
+	RegisterService(microService *discovery.MicroService) (string, error)
+	RegisterMicroServiceInstance(microServiceInstance *discovery.MicroServiceInstance) (string, error)
+	Heartbeat(microServiceID, microServiceInstanceID string) (bool, error)
+	UnregisterMicroServiceInstance(microServiceID, microServiceInstanceID string) (bool, error)
+	WatchMicroService(microServiceID string, callback func(*sc.MicroServiceInstanceChangedEvent)) error
+}
+
+// Registry is servicecomb registry.
+type Registry struct {
+	cli RegistryClient
+}
+
+func NewRegistry(client RegistryClient) *Registry {
+	r := &Registry{
+		cli: client,
+	}
+	return r
+}
+
+func (r *Registry) GetService(_ context.Context, serviceName string) ([]*registry.ServiceInstance, error) {
+	instances, err := r.cli.FindMicroServiceInstances("", appID, serviceName, "")
+	if err != nil {
+		return nil, err
+	}
+	svcInstances := make([]*registry.ServiceInstance, 0, len(instances))
+	for _, instance := range instances {
+		svcInstances = append(svcInstances, &registry.ServiceInstance{
+			ID:        instance.InstanceId,
+			Name:      serviceName,
+			Metadata:  instance.Properties,
+			Endpoints: instance.Endpoints,
+			Version:   instance.ServiceId,
+		})
+	}
+	return svcInstances, nil
+}
+
+func (r *Registry) Watch(ctx context.Context, serviceName string) (registry.Watcher, error) {
+	return newWatcher(ctx, r.cli, serviceName)
+}
+
+func (r *Registry) Register(_ context.Context, svcIns *registry.ServiceInstance) error {
+	fw := &discovery.FrameWork{
+		Name:    frameWorkName,
+		Version: frameWorkVersion,
+	}
+	ms := &discovery.MicroService{
+		ServiceName: svcIns.Name,
+		AppId:       appID,
+		Version:     svcIns.Version,
+		Environment: env,
+		Framework:   fw,
+	}
+	// 先尝试创建微服务
+	sid, err := r.cli.RegisterService(ms)
+	// 若失败，说明服务可能已注册
+	if err != nil {
+		registryException, ok := err.(*sc.RegistryException)
+		if !ok {
+			return err
+		}
+		var svcErr errsvc.Error
+		parseErr := json.Unmarshal([]byte(registryException.Message), &svcErr)
+		if parseErr != nil {
+			return parseErr
+		}
+		// 若错误码显示服务未注册，直接返回
+		if svcErr.Code != pb.ErrServiceAlreadyExists {
+			return err
+		}
+		sid, err = r.cli.GetMicroServiceID(appID, ms.ServiceName, ms.Version, ms.Environment)
+		if err != nil {
+			return err
+		}
+	} else {
+		// 保存当前版本微服务对应的sid
+		curServiceID = sid
+	}
+	props := make(map[string]string)
+	props[appIDKey] = appID
+	props[envKey] = env
+	if svcIns.ID == "" {
+		var id uuid.UUID
+		id, err = uuid.NewV4()
+		if err != nil {
+			return err
+		}
+		svcIns.ID = id.String()
+	}
+	_, err = r.cli.RegisterMicroServiceInstance(&discovery.MicroServiceInstance{
+		InstanceId: svcIns.ID,
+		ServiceId:  sid,
+		Endpoints:  svcIns.Endpoints,
+		HostName:   svcIns.ID,
+		Properties: props,
+		Version:    svcIns.Version,
+	})
+	if err != nil {
+		return err
+	}
+	ticker := time.NewTicker(30 * time.Second)
+	go func() {
+		for {
+			<-ticker.C
+			_, err = r.cli.Heartbeat(sid, svcIns.ID)
+			if err != nil {
+				log.Errorf("failed to send heartbeat: %v", err)
+				continue
+			}
+		}
+	}()
+	return nil
+}
+
+func (r *Registry) Deregister(_ context.Context, svcIns *registry.ServiceInstance) error {
+	sid, err := r.cli.GetMicroServiceID(appID, svcIns.Name, svcIns.Version, env)
+	if err != nil {
+		return err
+	}
+	_, err = r.cli.UnregisterMicroServiceInstance(sid, svcIns.ID)
+	if err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/contrib/registry/servicecomb/watcher.go b/contrib/registry/servicecomb/watcher.go
new file mode 100644
index 00000000..2b2117e8
--- /dev/null
+++ b/contrib/registry/servicecomb/watcher.go
@@ -0,0 +1,63 @@
+package servicecomb
+
+import (
+	"github.com/go-chassis/sc-client"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	"golang.org/x/net/context"
+)
+
+var _ registry.Watcher = (*Watcher)(nil)
+
+type Watcher struct {
+	cli RegistryClient
+	ch  chan *registry.ServiceInstance
+}
+
+func newWatcher(_ context.Context, cli RegistryClient, serviceName string) (*Watcher, error) {
+	// 构建当前服务与目标服务之间的依赖关系，完成discovery
+	_, err := cli.FindMicroServiceInstances(curServiceID, appID, serviceName, "")
+	if err != nil {
+		return nil, err
+	}
+	w := &Watcher{
+		cli: cli,
+		ch:  make(chan *registry.ServiceInstance),
+	}
+	go func() {
+		watchErr := w.cli.WatchMicroService(curServiceID, func(event *sc.MicroServiceInstanceChangedEvent) {
+			if event.Key.ServiceName != serviceName {
+				return
+			}
+			svcIns := &registry.ServiceInstance{
+				ID:        event.Instance.InstanceId,
+				Name:      event.Key.ServiceName,
+				Version:   event.Key.Version,
+				Metadata:  event.Instance.Properties,
+				Endpoints: event.Instance.Endpoints,
+			}
+			w.Put(svcIns)
+		})
+		if watchErr != nil {
+			return
+		}
+	}()
+	return w, nil
+}
+
+// Put only for UT
+func (w *Watcher) Put(svcIns *registry.ServiceInstance) {
+	w.ch <- svcIns
+}
+
+func (w *Watcher) Next() ([]*registry.ServiceInstance, error) {
+	var svcInstances []*registry.ServiceInstance
+	svcIns := <-w.ch
+	svcInstances = append(svcInstances, svcIns)
+	return svcInstances, nil
+}
+
+func (w *Watcher) Stop() error {
+	close(w.ch)
+	return nil
+}
diff --git a/selector/default_selector.go b/selector/default_selector.go
index 0e99249e..247af2e9 100644
--- a/selector/default_selector.go
+++ b/selector/default_selector.go
@@ -9,7 +9,6 @@ import (
 type Default struct {
 	NodeBuilder WeightedNodeBuilder
 	Balancer    Balancer
-	Filters     []Filter
 
 	nodes atomic.Value
 }
@@ -27,16 +26,13 @@ func (d *Default) Select(ctx context.Context, opts ...SelectOption) (selected No
 	for _, o := range opts {
 		o(&options)
 	}
-	if len(d.Filters) > 0 || len(options.Filters) > 0 {
+	if len(options.NodeFilters) > 0 {
 		newNodes := make([]Node, len(nodes))
 		for i, wc := range nodes {
 			newNodes[i] = wc
 		}
-		for _, f := range d.Filters {
-			newNodes = f(ctx, newNodes)
-		}
-		for _, f := range options.Filters {
-			newNodes = f(ctx, newNodes)
+		for _, filter := range options.NodeFilters {
+			newNodes = filter(ctx, newNodes)
 		}
 		candidates = make([]WeightedNode, len(newNodes))
 		for i, n := range newNodes {
@@ -74,7 +70,6 @@ func (d *Default) Apply(nodes []Node) {
 type DefaultBuilder struct {
 	Node     WeightedNodeBuilder
 	Balancer BalancerBuilder
-	Filters  []Filter
 }
 
 // Build create builder
@@ -82,6 +77,5 @@ func (db *DefaultBuilder) Build() Selector {
 	return &Default{
 		NodeBuilder: db.Node,
 		Balancer:    db.Balancer.Build(),
-		Filters:     db.Filters,
 	}
 }
diff --git a/selector/filter.go b/selector/filter.go
index e88a52da..c8b630d2 100644
--- a/selector/filter.go
+++ b/selector/filter.go
@@ -2,5 +2,5 @@ package selector
 
 import "context"
 
-// Filter is select filter.
-type Filter func(context.Context, []Node) []Node
+// NodeFilter is select filter.
+type NodeFilter func(context.Context, []Node) []Node
diff --git a/selector/filter/version.go b/selector/filter/version.go
index 815d3fb7..41d56fbd 100644
--- a/selector/filter/version.go
+++ b/selector/filter/version.go
@@ -7,7 +7,7 @@ import (
 )
 
 // Version is version filter.
-func Version(version string) selector.Filter {
+func Version(version string) selector.NodeFilter {
 	return func(_ context.Context, nodes []selector.Node) []selector.Node {
 		newNodes := nodes[:0]
 		for _, n := range nodes {
diff --git a/selector/global.go b/selector/global.go
new file mode 100644
index 00000000..2f951212
--- /dev/null
+++ b/selector/global.go
@@ -0,0 +1,13 @@
+package selector
+
+var globalSelector Builder
+
+// GlobalSelector returns global selector builder.
+func GlobalSelector() Builder {
+	return globalSelector
+}
+
+// SetGlobalSelector set global selector builder.
+func SetGlobalSelector(builder Builder) {
+	globalSelector = builder
+}
diff --git a/selector/options.go b/selector/options.go
index c9129fb3..14b441d7 100644
--- a/selector/options.go
+++ b/selector/options.go
@@ -2,15 +2,15 @@ package selector
 
 // SelectOptions is Select Options.
 type SelectOptions struct {
-	Filters []Filter
+	NodeFilters []NodeFilter
 }
 
 // SelectOption is Selector option.
 type SelectOption func(*SelectOptions)
 
-// WithFilter with filter options
-func WithFilter(fn ...Filter) SelectOption {
+// WithNodeFilter with filter options
+func WithNodeFilter(fn ...NodeFilter) SelectOption {
 	return func(opts *SelectOptions) {
-		opts.Filters = fn
+		opts.NodeFilters = fn
 	}
 }
diff --git a/selector/p2c/p2c.go b/selector/p2c/p2c.go
index 21a2199b..6f8d5a3f 100644
--- a/selector/p2c/p2c.go
+++ b/selector/p2c/p2c.go
@@ -19,20 +19,11 @@ const (
 
 var _ selector.Balancer = &Balancer{}
 
-// WithFilter with select filters
-func WithFilter(filters ...selector.Filter) Option {
-	return func(o *options) {
-		o.filters = filters
-	}
-}
-
 // Option is random builder option.
 type Option func(o *options)
 
 // options is random builder options
-type options struct {
-	filters []selector.Filter
-}
+type options struct{}
 
 // New creates a p2c selector.
 func New(opts ...Option) selector.Selector {
@@ -95,7 +86,6 @@ func NewBuilder(opts ...Option) selector.Builder {
 		opt(&option)
 	}
 	return &selector.DefaultBuilder{
-		Filters:  option.filters,
 		Balancer: &Builder{},
 		Node:     &ewma.Builder{},
 	}
diff --git a/selector/random/random.go b/selector/random/random.go
index 824fb883..cf59534d 100644
--- a/selector/random/random.go
+++ b/selector/random/random.go
@@ -15,20 +15,11 @@ const (
 
 var _ selector.Balancer = &Balancer{} // Name is balancer name
 
-// WithFilter with select filters
-func WithFilter(filters ...selector.Filter) Option {
-	return func(o *options) {
-		o.filters = filters
-	}
-}
-
 // Option is random builder option.
 type Option func(o *options)
 
 // options is random builder options
-type options struct {
-	filters []selector.Filter
-}
+type options struct{}
 
 // Balancer is a random balancer.
 type Balancer struct{}
@@ -56,7 +47,6 @@ func NewBuilder(opts ...Option) selector.Builder {
 		opt(&option)
 	}
 	return &selector.DefaultBuilder{
-		Filters:  option.filters,
 		Balancer: &Builder{},
 		Node:     &direct.Builder{},
 	}
diff --git a/selector/selector.go b/selector/selector.go
index 79ecdf78..e346f6c3 100644
--- a/selector/selector.go
+++ b/selector/selector.go
@@ -57,7 +57,7 @@ type DoneInfo struct {
 	// Response Error
 	Err error
 	// Response Metadata
-	ReplyMeta ReplyMeta
+	ReplyMD ReplyMD
 
 	// BytesSent indicates if any bytes have been sent to the server.
 	BytesSent bool
@@ -65,8 +65,8 @@ type DoneInfo struct {
 	BytesReceived bool
 }
 
-// ReplyMeta is Reply Metadata.
-type ReplyMeta interface {
+// ReplyMD is Reply Metadata.
+type ReplyMD interface {
 	Get(key string) string
 }
 
diff --git a/selector/wrr/wrr.go b/selector/wrr/wrr.go
index c3405915..0b95e04f 100644
--- a/selector/wrr/wrr.go
+++ b/selector/wrr/wrr.go
@@ -15,20 +15,11 @@ const (
 
 var _ selector.Balancer = &Balancer{} // Name is balancer name
 
-// WithFilter with select filters
-func WithFilter(filters ...selector.Filter) Option {
-	return func(o *options) {
-		o.filters = filters
-	}
-}
-
 // Option is random builder option.
 type Option func(o *options)
 
 // options is random builder options
-type options struct {
-	filters []selector.Filter
-}
+type options struct{}
 
 // Balancer is a random balancer.
 type Balancer struct {
@@ -77,7 +68,6 @@ func NewBuilder(opts ...Option) selector.Builder {
 		opt(&option)
 	}
 	return &selector.DefaultBuilder{
-		Filters:  option.filters,
 		Balancer: &Builder{},
 		Node:     &direct.Builder{},
 	}
diff --git a/transport/grpc/balancer.go b/transport/grpc/balancer.go
index 2a27c05a..bd50f098 100644
--- a/transport/grpc/balancer.go
+++ b/transport/grpc/balancer.go
@@ -1,59 +1,45 @@
 package grpc
 
 import (
-	"sync"
-
 	"github.com/go-kratos/kratos/v2/registry"
 	"github.com/go-kratos/kratos/v2/selector"
-	"github.com/go-kratos/kratos/v2/selector/p2c"
-	"github.com/go-kratos/kratos/v2/selector/random"
-	"github.com/go-kratos/kratos/v2/selector/wrr"
 	"github.com/go-kratos/kratos/v2/transport"
 
-	gBalancer "google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/balancer/base"
 	"google.golang.org/grpc/metadata"
 )
 
-var (
-	_ base.PickerBuilder = &Builder{}
-	_ gBalancer.Picker   = &Picker{}
+const (
+	balancerName = "selector"
+)
 
-	mu sync.Mutex
+var (
+	_ base.PickerBuilder = &balancerBuilder{}
+	_ balancer.Picker    = &balancerPicker{}
 )
 
 func init() {
-	// inject global grpc balancer
-	SetGlobalBalancer(random.Name, random.NewBuilder())
-	SetGlobalBalancer(wrr.Name, wrr.NewBuilder())
-	SetGlobalBalancer(p2c.Name, p2c.NewBuilder())
-}
-
-// SetGlobalBalancer set grpc balancer with scheme.
-func SetGlobalBalancer(scheme string, builder selector.Builder) {
-	mu.Lock()
-	defer mu.Unlock()
-
 	b := base.NewBalancerBuilder(
-		scheme,
-		&Builder{builder: builder},
+		balancerName,
+		&balancerBuilder{
+			builder: selector.GlobalSelector(),
+		},
 		base.Config{HealthCheck: true},
 	)
-	gBalancer.Register(b)
+	balancer.Register(b)
 }
 
-// Builder is grpc balancer builder.
-type Builder struct {
+type balancerBuilder struct {
 	builder selector.Builder
 }
 
 // Build creates a grpc Picker.
-func (b *Builder) Build(info base.PickerBuildInfo) gBalancer.Picker {
+func (b *balancerBuilder) Build(info base.PickerBuildInfo) balancer.Picker {
 	if len(info.ReadySCs) == 0 {
 		// Block the RPC until a new picker is available via UpdateState().
-		return base.NewErrPicker(gBalancer.ErrNoSubConnAvailable)
+		return base.NewErrPicker(balancer.ErrNoSubConnAvailable)
 	}
-
 	nodes := make([]selector.Node, 0)
 	for conn, info := range info.ReadySCs {
 		ins, _ := info.Address.Attributes.Value("rawServiceInstance").(*registry.ServiceInstance)
@@ -62,40 +48,40 @@ func (b *Builder) Build(info base.PickerBuildInfo) gBalancer.Picker {
 			subConn: conn,
 		})
 	}
-	p := &Picker{
+	p := &balancerPicker{
 		selector: b.builder.Build(),
 	}
 	p.selector.Apply(nodes)
 	return p
 }
 
-// Picker is a grpc picker.
-type Picker struct {
+// balancerPicker is a grpc picker.
+type balancerPicker struct {
 	selector selector.Selector
 }
 
 // Pick pick instances.
-func (p *Picker) Pick(info gBalancer.PickInfo) (gBalancer.PickResult, error) {
-	var filters []selector.Filter
+func (p *balancerPicker) Pick(info balancer.PickInfo) (balancer.PickResult, error) {
+	var filters []selector.NodeFilter
 	if tr, ok := transport.FromClientContext(info.Ctx); ok {
 		if gtr, ok := tr.(*Transport); ok {
-			filters = gtr.SelectFilters()
+			filters = gtr.NodeFilters()
 		}
 	}
 
-	n, done, err := p.selector.Select(info.Ctx, selector.WithFilter(filters...))
+	n, done, err := p.selector.Select(info.Ctx, selector.WithNodeFilter(filters...))
 	if err != nil {
-		return gBalancer.PickResult{}, err
+		return balancer.PickResult{}, err
 	}
 
-	return gBalancer.PickResult{
+	return balancer.PickResult{
 		SubConn: n.(*grpcNode).subConn,
-		Done: func(di gBalancer.DoneInfo) {
+		Done: func(di balancer.DoneInfo) {
 			done(info.Ctx, selector.DoneInfo{
 				Err:           di.Err,
 				BytesSent:     di.BytesSent,
 				BytesReceived: di.BytesReceived,
-				ReplyMeta:     Trailer(di.Trailer),
+				ReplyMD:       Trailer(di.Trailer),
 			})
 		},
 	}, nil
@@ -115,5 +101,5 @@ func (t Trailer) Get(k string) string {
 
 type grpcNode struct {
 	selector.Node
-	subConn gBalancer.SubConn
+	subConn balancer.SubConn
 }
diff --git a/transport/grpc/client.go b/transport/grpc/client.go
index 923e5267..a1424d20 100644
--- a/transport/grpc/client.go
+++ b/transport/grpc/client.go
@@ -10,7 +10,7 @@ import (
 	"github.com/go-kratos/kratos/v2/middleware"
 	"github.com/go-kratos/kratos/v2/registry"
 	"github.com/go-kratos/kratos/v2/selector"
-	"github.com/go-kratos/kratos/v2/selector/wrr"
+	"github.com/go-kratos/kratos/v2/selector/p2c"
 	"github.com/go-kratos/kratos/v2/transport"
 	"github.com/go-kratos/kratos/v2/transport/grpc/resolver/discovery"
 
@@ -23,6 +23,12 @@ import (
 	grpcmd "google.golang.org/grpc/metadata"
 )
 
+func init() {
+	if selector.GlobalSelector() == nil {
+		selector.SetGlobalSelector(p2c.NewBuilder())
+	}
+}
+
 // ClientOption is gRPC client option.
 type ClientOption func(o *clientOptions)
 
@@ -75,15 +81,8 @@ func WithOptions(opts ...grpc.DialOption) ClientOption {
 	}
 }
 
-// WithBalancerName with balancer name
-func WithBalancerName(name string) ClientOption {
-	return func(o *clientOptions) {
-		o.balancerName = name
-	}
-}
-
-// WithFilter with select filters
-func WithFilter(filters ...selector.Filter) ClientOption {
+// WithNodeFilter with select filters
+func WithNodeFilter(filters ...selector.NodeFilter) ClientOption {
 	return func(o *clientOptions) {
 		o.filters = filters
 	}
@@ -105,7 +104,7 @@ type clientOptions struct {
 	ints         []grpc.UnaryClientInterceptor
 	grpcOpts     []grpc.DialOption
 	balancerName string
-	filters      []selector.Filter
+	filters      []selector.NodeFilter
 }
 
 // Dial returns a GRPC connection.
@@ -121,7 +120,7 @@ func DialInsecure(ctx context.Context, opts ...ClientOption) (*grpc.ClientConn,
 func dial(ctx context.Context, insecure bool, opts ...ClientOption) (*grpc.ClientConn, error) {
 	options := clientOptions{
 		timeout:      2000 * time.Millisecond,
-		balancerName: wrr.Name,
+		balancerName: balancerName,
 	}
 	for _, o := range opts {
 		o(&options)
@@ -156,13 +155,13 @@ func dial(ctx context.Context, insecure bool, opts ...ClientOption) (*grpc.Clien
 	return grpc.DialContext(ctx, options.endpoint, grpcOpts...)
 }
 
-func unaryClientInterceptor(ms []middleware.Middleware, timeout time.Duration, filters []selector.Filter) grpc.UnaryClientInterceptor {
+func unaryClientInterceptor(ms []middleware.Middleware, timeout time.Duration, filters []selector.NodeFilter) grpc.UnaryClientInterceptor {
 	return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
 		ctx = transport.NewClientContext(ctx, &Transport{
-			endpoint:  cc.Target(),
-			operation: method,
-			reqHeader: headerCarrier{},
-			filters:   filters,
+			endpoint:    cc.Target(),
+			operation:   method,
+			reqHeader:   headerCarrier{},
+			nodeFilters: filters,
 		})
 		if timeout > 0 {
 			var cancel context.CancelFunc
diff --git a/transport/grpc/transport.go b/transport/grpc/transport.go
index efa70e74..a11a271a 100644
--- a/transport/grpc/transport.go
+++ b/transport/grpc/transport.go
@@ -14,7 +14,7 @@ type Transport struct {
 	operation   string
 	reqHeader   headerCarrier
 	replyHeader headerCarrier
-	filters     []selector.Filter
+	nodeFilters []selector.NodeFilter
 }
 
 // Kind returns the transport kind.
@@ -42,9 +42,9 @@ func (tr *Transport) ReplyHeader() transport.Header {
 	return tr.replyHeader
 }
 
-// SelectFilters returns the client select filters.
-func (tr *Transport) SelectFilters() []selector.Filter {
-	return tr.filters
+// NodeFilters returns the client select filters.
+func (tr *Transport) NodeFilters() []selector.NodeFilter {
+	return tr.nodeFilters
 }
 
 type headerCarrier metadata.MD
diff --git a/transport/http/client.go b/transport/http/client.go
index f1c21359..79ac4f91 100644
--- a/transport/http/client.go
+++ b/transport/http/client.go
@@ -16,10 +16,16 @@ import (
 	"github.com/go-kratos/kratos/v2/middleware"
 	"github.com/go-kratos/kratos/v2/registry"
 	"github.com/go-kratos/kratos/v2/selector"
-	"github.com/go-kratos/kratos/v2/selector/wrr"
+	"github.com/go-kratos/kratos/v2/selector/p2c"
 	"github.com/go-kratos/kratos/v2/transport"
 )
 
+func init() {
+	if selector.GlobalSelector() == nil {
+		selector.SetGlobalSelector(p2c.NewBuilder())
+	}
+}
+
 // DecodeErrorFunc is decode error func.
 type DecodeErrorFunc func(ctx context.Context, res *http.Response) error
 
@@ -43,7 +49,7 @@ type clientOptions struct {
 	decoder      DecodeResponseFunc
 	errorDecoder DecodeErrorFunc
 	transport    http.RoundTripper
-	selector     selector.Selector
+	nodeFilters  []selector.NodeFilter
 	discovery    registry.Discovery
 	middleware   []middleware.Middleware
 	block        bool
@@ -112,10 +118,10 @@ func WithDiscovery(d registry.Discovery) ClientOption {
 	}
 }
 
-// WithSelector with client selector.
-func WithSelector(selector selector.Selector) ClientOption {
+// WithNodeFilter with select filters
+func WithNodeFilter(filters ...selector.NodeFilter) ClientOption {
 	return func(o *clientOptions) {
-		o.selector = selector
+		o.nodeFilters = filters
 	}
 }
 
@@ -140,6 +146,7 @@ type Client struct {
 	r        *resolver
 	cc       *http.Client
 	insecure bool
+	selector selector.Selector
 }
 
 // NewClient returns an HTTP client.
@@ -151,7 +158,6 @@ func NewClient(ctx context.Context, opts ...ClientOption) (*Client, error) {
 		decoder:      DefaultResponseDecoder,
 		errorDecoder: DefaultErrorDecoder,
 		transport:    http.DefaultTransport,
-		selector:     wrr.New(),
 	}
 	for _, o := range opts {
 		o(&options)
@@ -166,10 +172,11 @@ func NewClient(ctx context.Context, opts ...ClientOption) (*Client, error) {
 	if err != nil {
 		return nil, err
 	}
+	selector := selector.GlobalSelector().Build()
 	var r *resolver
 	if options.discovery != nil {
 		if target.Scheme == "discovery" {
-			if r, err = newResolver(ctx, options.discovery, target, options.selector, options.block, insecure); err != nil {
+			if r, err = newResolver(ctx, options.discovery, target, selector, options.block, insecure); err != nil {
 				return nil, fmt.Errorf("[http client] new resolver failed!err: %v", options.endpoint)
 			}
 		} else if _, _, err := host.ExtractHostPort(options.endpoint); err != nil {
@@ -185,6 +192,7 @@ func NewClient(ctx context.Context, opts ...ClientOption) (*Client, error) {
 			Timeout:   options.timeout,
 			Transport: options.transport,
 		},
+		selector: selector,
 	}, nil
 }
 
@@ -276,7 +284,7 @@ func (client *Client) do(req *http.Request) (*http.Response, error) {
 			err  error
 			node selector.Node
 		)
-		if node, done, err = client.opts.selector.Select(req.Context()); err != nil {
+		if node, done, err = client.selector.Select(req.Context(), selector.WithNodeFilter(client.opts.nodeFilters...)); err != nil {
 			return nil, errors.ServiceUnavailable("NODE_NOT_FOUND", err.Error())
 		}
 		if client.insecure {


Test patch:
diff --git a/contrib/registry/servicecomb/registry_test.go b/contrib/registry/servicecomb/registry_test.go
new file mode 100644
index 00000000..d100c68a
--- /dev/null
+++ b/contrib/registry/servicecomb/registry_test.go
@@ -0,0 +1,128 @@
+package servicecomb
+
+import (
+	"context"
+	"testing"
+
+	pb "github.com/go-chassis/cari/discovery"
+	"github.com/go-chassis/sc-client"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/gofrs/uuid"
+	"github.com/stretchr/testify/assert"
+)
+
+var r *Registry
+
+func init() {
+	c := &mockClient{}
+	r = NewRegistry(c)
+}
+
+type mockClient struct{}
+
+func (receiver *mockClient) WatchMicroService(microServiceID string, callback func(*sc.MicroServiceInstanceChangedEvent)) error {
+	return nil
+}
+
+//nolint
+func (receiver *mockClient) FindMicroServiceInstances(consumerID,
+	appID, microServiceName, versionRule string, opts ...sc.CallOption,
+
+) ([]*pb.MicroServiceInstance, error) {
+	if microServiceName == "KratosServicecomb" {
+		return []*pb.MicroServiceInstance{{}}, nil
+	}
+	return nil, nil
+}
+
+func (receiver *mockClient) RegisterService(microService *pb.MicroService) (string, error) {
+	return "", nil
+}
+
+func (receiver *mockClient) RegisterMicroServiceInstance(microServiceInstance *pb.MicroServiceInstance) (string, error) {
+	return "", nil
+}
+
+func (receiver *mockClient) Heartbeat(microServiceID, microServiceInstanceID string) (bool, error) {
+	return true, nil
+}
+
+func (receiver *mockClient) UnregisterMicroServiceInstance(microServiceID, microServiceInstanceID string) (bool, error) {
+	return true, nil
+}
+
+func (receiver *mockClient) GetMicroServiceID(appID, microServiceName, version, env string, opts ...sc.CallOption) (string, error) {
+	return "", nil
+}
+
+// TestRegistry
+func TestRegistry(t *testing.T) {
+	instanceID, err := uuid.NewV4()
+	assert.NoError(t, err)
+	svc := &registry.ServiceInstance{
+		Name:      "KratosServicecomb",
+		Version:   "0.0.1",
+		Metadata:  map[string]string{"app": "kratos"},
+		Endpoints: []string{"tcp://127.0.0.1:9000?isSecure=false"},
+		ID:        instanceID.String(),
+	}
+	ctx := context.TODO()
+	t.Run("Register test, expected: success.", func(t *testing.T) {
+		err = r.Register(ctx, svc)
+		assert.NoError(t, err)
+	})
+	t.Run("GetService test, expected: success.", func(t *testing.T) {
+		var insts []*registry.ServiceInstance
+		insts, err = r.GetService(ctx, svc.Name)
+		assert.NoError(t, err)
+		assert.Greater(t, len(insts), 0)
+	})
+	t.Run("Deregister test, expected: success.", func(t *testing.T) {
+		svc.ID = instanceID.String()
+		err = r.Deregister(ctx, svc)
+		assert.NoError(t, err)
+	})
+}
+
+func TestWatcher(t *testing.T) {
+	ctx := context.TODO()
+	instanceID1, err := uuid.NewV4()
+	assert.NoError(t, err)
+	svc1 := &registry.ServiceInstance{
+		Name:      "WatcherTest",
+		Version:   "0.0.1",
+		Metadata:  map[string]string{"app": "kratos"},
+		Endpoints: []string{"tcp://127.0.0.1:9000?isSecure=false"},
+		ID:        instanceID1.String(),
+	}
+	err = r.Register(ctx, svc1)
+	assert.NoError(t, err)
+	w, err := r.Watch(ctx, "WatcherTest")
+	assert.NoError(t, err)
+	assert.NotEmpty(t, w)
+	sbWatcher := w.(*Watcher)
+	t.Run("Watch register event, expected: success", func(t *testing.T) {
+		go sbWatcher.Put(svc1)
+		var instances []*registry.ServiceInstance
+		instances, err = w.Next()
+		assert.NoError(t, err)
+		assert.NotEmpty(t, instances)
+		assert.Equal(t, instanceID1.String(), instances[0].ID)
+	})
+	t.Run("Watch deregister event, expected: success", func(t *testing.T) {
+		// Deregister instance1.
+		err = r.Deregister(ctx, svc1)
+		assert.NoError(t, err)
+		go sbWatcher.Put(svc1)
+		var instances []*registry.ServiceInstance
+		instances, err = w.Next()
+		assert.NoError(t, err)
+		assert.NotEmpty(t, instances)
+		assert.Equal(t, instanceID1.String(), instances[0].ID)
+	})
+	t.Run("Stop test, expected: success", func(t *testing.T) {
+		err = w.Stop()
+		assert.NoError(t, err)
+	})
+}
diff --git a/selector/p2c/p2c_test.go b/selector/p2c/p2c_test.go
index 03d549e2..f23412b7 100644
--- a/selector/p2c/p2c_test.go
+++ b/selector/p2c/p2c_test.go
@@ -16,7 +16,7 @@ import (
 )
 
 func TestWrr3(t *testing.T) {
-	p2c := New(WithFilter(filter.Version("v2.0.0")))
+	p2c := New()
 	var nodes []selector.Node
 	for i := 0; i < 3; i++ {
 		addr := fmt.Sprintf("127.0.0.%d:8080", i)
@@ -41,7 +41,7 @@ func TestWrr3(t *testing.T) {
 			d := time.Duration(rand.Intn(500)) * time.Millisecond
 			lk.Unlock()
 			time.Sleep(d)
-			n, done, err := p2c.Select(context.Background())
+			n, done, err := p2c.Select(context.Background(), selector.WithNodeFilter(filter.Version("v2.0.0")))
 			if err != nil {
 				t.Errorf("expect %v, got %v", nil, err)
 			}
@@ -92,7 +92,7 @@ func TestEmpty(t *testing.T) {
 }
 
 func TestOne(t *testing.T) {
-	p2c := New(WithFilter(filter.Version("v2.0.0")))
+	p2c := New()
 	var nodes []selector.Node
 	for i := 0; i < 1; i++ {
 		addr := fmt.Sprintf("127.0.0.%d:8080", i)
@@ -106,7 +106,7 @@ func TestOne(t *testing.T) {
 			}))
 	}
 	p2c.Apply(nodes)
-	n, done, err := p2c.Select(context.Background())
+	n, done, err := p2c.Select(context.Background(), selector.WithNodeFilter(filter.Version("v2.0.0")))
 	if err != nil {
 		t.Errorf("expect %v, got %v", nil, err)
 	}
diff --git a/selector/random/random_test.go b/selector/random/random_test.go
index 7e69f3ee..33e68994 100644
--- a/selector/random/random_test.go
+++ b/selector/random/random_test.go
@@ -10,7 +10,7 @@ import (
 )
 
 func TestWrr(t *testing.T) {
-	random := New(WithFilter(filter.Version("v2.0.0")))
+	random := New()
 	var nodes []selector.Node
 	nodes = append(nodes, selector.NewNode(
 		"http",
@@ -31,7 +31,7 @@ func TestWrr(t *testing.T) {
 	random.Apply(nodes)
 	var count1, count2 int
 	for i := 0; i < 200; i++ {
-		n, done, err := random.Select(context.Background())
+		n, done, err := random.Select(context.Background(), selector.WithNodeFilter(filter.Version("v2.0.0")))
 		if err != nil {
 			t.Errorf("expect no error, got %v", err)
 		}
diff --git a/selector/selector_test.go b/selector/selector_test.go
index 25e70acd..f7c1f1bc 100644
--- a/selector/selector_test.go
+++ b/selector/selector_test.go
@@ -49,7 +49,7 @@ func (b *mockWeightedNodeBuilder) Build(n Node) WeightedNode {
 	return &mockWeightedNode{Node: n}
 }
 
-func mockFilter(version string) Filter {
+func mockFilter(version string) NodeFilter {
 	return func(_ context.Context, nodes []Node) []Node {
 		newNodes := nodes[:0]
 		for _, n := range nodes {
@@ -83,7 +83,6 @@ func (b *mockBalancer) Pick(ctx context.Context, nodes []WeightedNode) (selected
 func TestDefault(t *testing.T) {
 	builder := DefaultBuilder{
 		Node:     &mockWeightedNodeBuilder{},
-		Filters:  []Filter{mockFilter("v2.0.0")},
 		Balancer: &mockBalancerBuilder{},
 	}
 	selector := builder.Build()
@@ -109,7 +108,7 @@ func TestDefault(t *testing.T) {
 			Metadata:  map[string]string{"weight": "10"},
 		}))
 	selector.Apply(nodes)
-	n, done, err := selector.Select(context.Background(), WithFilter(mockFilter("v2.0.0")))
+	n, done, err := selector.Select(context.Background(), WithNodeFilter(mockFilter("v2.0.0")))
 	if err != nil {
 		t.Errorf("expect %v, got %v", nil, err)
 	}
@@ -137,7 +136,7 @@ func TestDefault(t *testing.T) {
 	done(context.Background(), DoneInfo{})
 
 	// no v3.0.0 instance
-	n, done, err = selector.Select(context.Background(), WithFilter(mockFilter("v3.0.0")))
+	n, done, err = selector.Select(context.Background(), WithNodeFilter(mockFilter("v3.0.0")))
 	if !errors.Is(ErrNoAvailable, err) {
 		t.Errorf("expect %v, got %v", ErrNoAvailable, err)
 	}
@@ -150,7 +149,7 @@ func TestDefault(t *testing.T) {
 
 	// apply zero instance
 	selector.Apply([]Node{})
-	n, done, err = selector.Select(context.Background(), WithFilter(mockFilter("v2.0.0")))
+	n, done, err = selector.Select(context.Background(), WithNodeFilter(mockFilter("v2.0.0")))
 	if !errors.Is(ErrNoAvailable, err) {
 		t.Errorf("expect %v, got %v", ErrNoAvailable, err)
 	}
@@ -163,7 +162,7 @@ func TestDefault(t *testing.T) {
 
 	// apply zero instance
 	selector.Apply(nil)
-	n, done, err = selector.Select(context.Background(), WithFilter(mockFilter("v2.0.0")))
+	n, done, err = selector.Select(context.Background(), WithNodeFilter(mockFilter("v2.0.0")))
 	if !errors.Is(ErrNoAvailable, err) {
 		t.Errorf("expect %v, got %v", ErrNoAvailable, err)
 	}
diff --git a/selector/wrr/wrr_test.go b/selector/wrr/wrr_test.go
index e3e96ed4..f1d4b45f 100644
--- a/selector/wrr/wrr_test.go
+++ b/selector/wrr/wrr_test.go
@@ -11,7 +11,7 @@ import (
 )
 
 func TestWrr(t *testing.T) {
-	wrr := New(WithFilter(filter.Version("v2.0.0")))
+	wrr := New()
 	var nodes []selector.Node
 	nodes = append(nodes, selector.NewNode(
 		"http",
@@ -32,7 +32,7 @@ func TestWrr(t *testing.T) {
 	wrr.Apply(nodes)
 	var count1, count2 int
 	for i := 0; i < 90; i++ {
-		n, done, err := wrr.Select(context.Background())
+		n, done, err := wrr.Select(context.Background(), selector.WithNodeFilter(filter.Version("v2.0.0")))
 		if err != nil {
 			t.Errorf("expect no error, got %v", err)
 		}
diff --git a/transport/grpc/balancer_test.go b/transport/grpc/balancer_test.go
index bff519bd..5b700264 100644
--- a/transport/grpc/balancer_test.go
+++ b/transport/grpc/balancer_test.go
@@ -19,19 +19,10 @@ func TestTrailer(t *testing.T) {
 	}
 }
 
-func TestBalancerName(t *testing.T) {
-	o := &clientOptions{}
-
-	WithBalancerName("p2c")(o)
-	if !reflect.DeepEqual("p2c", o.balancerName) {
-		t.Errorf("expect %v, got %v", "p2c", o.balancerName)
-	}
-}
-
 func TestFilters(t *testing.T) {
 	o := &clientOptions{}
 
-	WithFilter(func(_ context.Context, nodes []selector.Node) []selector.Node {
+	WithNodeFilter(func(_ context.Context, nodes []selector.Node) []selector.Node {
 		return nodes
 	})(o)
 	if !reflect.DeepEqual(1, len(o.filters)) {
diff --git a/transport/http/client_test.go b/transport/http/client_test.go
index c768b364..4ee00456 100644
--- a/transport/http/client_test.go
+++ b/transport/http/client_test.go
@@ -182,13 +182,18 @@ func TestWithDiscovery(t *testing.T) {
 	}
 }
 
-func TestWithSelector(t *testing.T) {
-	ov := &selector.Default{}
-	o := WithSelector(ov)
+func TestWithNodeFilter(t *testing.T) {
+	ov := func(context.Context, []selector.Node) []selector.Node {
+		return []selector.Node{&selector.DefaultNode{}}
+	}
+	o := WithNodeFilter(ov)
 	co := &clientOptions{}
 	o(co)
-	if !reflect.DeepEqual(co.selector, ov) {
-		t.Errorf("expected selector to be %v, got %v", ov, co.selector)
+	for _, n := range co.nodeFilters {
+		ret := n(context.Background(), nil)
+		if len(ret) != 1 {
+			t.Errorf("expected node  length to be 1, got %v", len(ret))
+		}
 	}
 }