feat: registry.

2025-06-02 11:53:18 +08:00
parent b0e91998e1
commit 59c731904a
83 changed files with 7154 additions and 1784 deletions
--- a/registry/consul/client.go
+++ b/registry/consul/client.go
@@ -1,31 +1,245 @@
 package consul

 import (
-	consulKratos "github.com/go-kratos/kratos/contrib/registry/consul/v2"
+	"context"
+	"errors"
+	"fmt"
+	"math/rand"
+	"net"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
 	"github.com/go-kratos/kratos/v2/log"
+	"github.com/go-kratos/kratos/v2/registry"

-	consulClient "github.com/hashicorp/consul/api"
-
-	conf "github.com/tx7do/kratos-bootstrap/api/gen/go/conf/v1"
+	"github.com/hashicorp/consul/api"
 )

-// NewRegistry 创建一个注册发现客户端 - Consul
-func NewRegistry(c *conf.Registry) *consulKratos.Registry {
-	if c == nil || c.Consul == nil {
-		return nil
-	}
+type Datacenter string

-	cfg := consulClient.DefaultConfig()
-	cfg.Address = c.Consul.GetAddress()
-	cfg.Scheme = c.Consul.GetScheme()
+const (
+	SingleDatacenter Datacenter = "SINGLE"
+	MultiDatacenter  Datacenter = "MULTI"
+)

-	var cli *consulClient.Client
-	var err error
-	if cli, err = consulClient.NewClient(cfg); err != nil {
-		log.Fatal(err)
-	}
+// Client is consul client config
+type Client struct {
+	dc     Datacenter
+	cli    *api.Client
+	ctx    context.Context
+	cancel context.CancelFunc

-	reg := consulKratos.New(cli, consulKratos.WithHealthCheck(c.Consul.GetHealthCheck()))
-
-	return reg
+	// resolve service entry endpoints
+	resolver ServiceResolver
+	// healthcheck time interval in seconds
+	healthcheckInterval int
+	// heartbeat enable heartbeat
+	heartbeat bool
+	// deregisterCriticalServiceAfter time interval in seconds
+	deregisterCriticalServiceAfter int
+	// serviceChecks  user custom checks
+	serviceChecks api.AgentServiceChecks
+}
+
+func defaultResolver(_ context.Context, entries []*api.ServiceEntry) []*registry.ServiceInstance {
+	services := make([]*registry.ServiceInstance, 0, len(entries))
+	for _, entry := range entries {
+		var version string
+		for _, tag := range entry.Service.Tags {
+			ss := strings.SplitN(tag, "=", 2)
+			if len(ss) == 2 && ss[0] == "version" {
+				version = ss[1]
+			}
+		}
+		endpoints := make([]string, 0)
+		for scheme, addr := range entry.Service.TaggedAddresses {
+			if scheme == "lan_ipv4" || scheme == "wan_ipv4" || scheme == "lan_ipv6" || scheme == "wan_ipv6" {
+				continue
+			}
+			endpoints = append(endpoints, addr.Address)
+		}
+		if len(endpoints) == 0 && entry.Service.Address != "" && entry.Service.Port != 0 {
+			endpoints = append(endpoints, fmt.Sprintf("http://%s:%d", entry.Service.Address, entry.Service.Port))
+		}
+		services = append(services, &registry.ServiceInstance{
+			ID:        entry.Service.ID,
+			Name:      entry.Service.Service,
+			Metadata:  entry.Service.Meta,
+			Version:   version,
+			Endpoints: endpoints,
+		})
+	}
+
+	return services
+}
+
+// ServiceResolver is used to resolve service endpoints
+type ServiceResolver func(ctx context.Context, entries []*api.ServiceEntry) []*registry.ServiceInstance
+
+// Service get services from consul
+func (c *Client) Service(ctx context.Context, service string, index uint64, passingOnly bool) ([]*registry.ServiceInstance, uint64, error) {
+	if c.dc == MultiDatacenter {
+		return c.multiDCService(ctx, service, index, passingOnly)
+	}
+
+	opts := &api.QueryOptions{
+		WaitIndex:  index,
+		WaitTime:   time.Second * 55,
+		Datacenter: string(c.dc),
+	}
+	opts = opts.WithContext(ctx)
+
+	if c.dc == SingleDatacenter {
+		opts.Datacenter = ""
+	}
+
+	entries, meta, err := c.singleDCEntries(service, "", passingOnly, opts)
+	if err != nil {
+		return nil, 0, err
+	}
+	return c.resolver(ctx, entries), meta.LastIndex, nil
+}
+
+func (c *Client) multiDCService(ctx context.Context, service string, index uint64, passingOnly bool) ([]*registry.ServiceInstance, uint64, error) {
+	opts := &api.QueryOptions{
+		WaitIndex: index,
+		WaitTime:  time.Second * 55,
+	}
+	opts = opts.WithContext(ctx)
+
+	var instances []*registry.ServiceInstance
+
+	dcs, err := c.cli.Catalog().Datacenters()
+	if err != nil {
+		return nil, 0, err
+	}
+
+	for _, dc := range dcs {
+		opts.Datacenter = dc
+		e, m, err := c.singleDCEntries(service, "", passingOnly, opts)
+		if err != nil {
+			return nil, 0, err
+		}
+
+		ins := c.resolver(ctx, e)
+		for _, in := range ins {
+			if in.Metadata == nil {
+				in.Metadata = make(map[string]string, 1)
+			}
+			in.Metadata["dc"] = dc
+		}
+
+		instances = append(instances, ins...)
+		opts.WaitIndex = m.LastIndex
+	}
+
+	return instances, opts.WaitIndex, nil
+}
+
+func (c *Client) singleDCEntries(service, tag string, passingOnly bool, opts *api.QueryOptions) ([]*api.ServiceEntry, *api.QueryMeta, error) {
+	return c.cli.Health().Service(service, tag, passingOnly, opts)
+}
+
+// Register register service instance to consul
+func (c *Client) Register(_ context.Context, svc *registry.ServiceInstance, enableHealthCheck bool) error {
+	addresses := make(map[string]api.ServiceAddress, len(svc.Endpoints))
+	checkAddresses := make([]string, 0, len(svc.Endpoints))
+	for _, endpoint := range svc.Endpoints {
+		raw, err := url.Parse(endpoint)
+		if err != nil {
+			return err
+		}
+		addr := raw.Hostname()
+		port, _ := strconv.ParseUint(raw.Port(), 10, 16)
+
+		checkAddresses = append(checkAddresses, net.JoinHostPort(addr, strconv.FormatUint(port, 10)))
+		addresses[raw.Scheme] = api.ServiceAddress{Address: endpoint, Port: int(port)}
+	}
+	asr := &api.AgentServiceRegistration{
+		ID:              svc.ID,
+		Name:            svc.Name,
+		Meta:            svc.Metadata,
+		Tags:            []string{fmt.Sprintf("version=%s", svc.Version)},
+		TaggedAddresses: addresses,
+	}
+	if len(checkAddresses) > 0 {
+		host, portRaw, _ := net.SplitHostPort(checkAddresses[0])
+		port, _ := strconv.ParseInt(portRaw, 10, 32)
+		asr.Address = host
+		asr.Port = int(port)
+	}
+	if enableHealthCheck {
+		for _, address := range checkAddresses {
+			asr.Checks = append(asr.Checks, &api.AgentServiceCheck{
+				TCP:                            address,
+				Interval:                       fmt.Sprintf("%ds", c.healthcheckInterval),
+				DeregisterCriticalServiceAfter: fmt.Sprintf("%ds", c.deregisterCriticalServiceAfter),
+				Timeout:                        "5s",
+			})
+		}
+		// custom checks
+		asr.Checks = append(asr.Checks, c.serviceChecks...)
+	}
+	if c.heartbeat {
+		asr.Checks = append(asr.Checks, &api.AgentServiceCheck{
+			CheckID:                        "service:" + svc.ID,
+			TTL:                            fmt.Sprintf("%ds", c.healthcheckInterval*2),
+			DeregisterCriticalServiceAfter: fmt.Sprintf("%ds", c.deregisterCriticalServiceAfter),
+		})
+	}
+
+	err := c.cli.Agent().ServiceRegister(asr)
+	if err != nil {
+		return err
+	}
+	if c.heartbeat {
+		go func() {
+			time.Sleep(time.Second)
+			err = c.cli.Agent().UpdateTTL("service:"+svc.ID, "pass", "pass")
+			if err != nil {
+				log.Errorf("[Consul]update ttl heartbeat to consul failed!err:=%v", err)
+			}
+			ticker := time.NewTicker(time.Second * time.Duration(c.healthcheckInterval))
+			defer ticker.Stop()
+			for {
+				select {
+				case <-c.ctx.Done():
+					_ = c.cli.Agent().ServiceDeregister(svc.ID)
+					return
+				default:
+				}
+				select {
+				case <-c.ctx.Done():
+					_ = c.cli.Agent().ServiceDeregister(svc.ID)
+					return
+				case <-ticker.C:
+					// ensure that unregistered services will not be re-registered by mistake
+					if errors.Is(c.ctx.Err(), context.Canceled) || errors.Is(c.ctx.Err(), context.DeadlineExceeded) {
+						_ = c.cli.Agent().ServiceDeregister(svc.ID)
+						return
+					}
+					err = c.cli.Agent().UpdateTTL("service:"+svc.ID, "pass", "pass")
+					if err != nil {
+						log.Errorf("[Consul] update ttl heartbeat to consul failed! err=%v", err)
+						// when the previous report fails, try to re register the service
+						time.Sleep(time.Duration(rand.Intn(5)) * time.Second)
+						if err := c.cli.Agent().ServiceRegister(asr); err != nil {
+							log.Errorf("[Consul] re registry service failed!, err=%v", err)
+						} else {
+							log.Warn("[Consul] re registry of service occurred success")
+						}
+					}
+				}
+			}
+		}()
+	}
+	return nil
+}
+
+// Deregister service by service ID
+func (c *Client) Deregister(_ context.Context, serviceID string) error {
+	defer c.cancel()
+	return c.cli.Agent().ServiceDeregister(serviceID)
 }
--- a/registry/consul/client_creator.go
+++ b/registry/consul/client_creator.go
@@ -0,0 +1,34 @@
+package consul
+
+import (
+	"github.com/go-kratos/kratos/v2/log"
+	consulClient "github.com/hashicorp/consul/api"
+
+	conf "github.com/tx7do/kratos-bootstrap/api/gen/go/conf/v1"
+)
+
+func init() {
+	// 注册 Consul 注册发现客户端
+	//registry.RegisterDiscoveryCreator(registry.Consul, NewRegistry)
+}
+
+// NewRegistry 创建一个注册发现客户端 - Consul
+func NewRegistry(c *conf.Registry) *Registry {
+	if c == nil || c.Consul == nil {
+		return nil
+	}
+
+	cfg := consulClient.DefaultConfig()
+	cfg.Address = c.Consul.GetAddress()
+	cfg.Scheme = c.Consul.GetScheme()
+
+	var cli *consulClient.Client
+	var err error
+	if cli, err = consulClient.NewClient(cfg); err != nil {
+		log.Fatal(err)
+	}
+
+	reg := New(cli, WithHealthCheck(c.Consul.GetHealthCheck()))
+
+	return reg
+}
--- a/registry/consul/client_creator_test.go
+++ b/registry/consul/client_creator_test.go
--- a/registry/consul/go.mod
+++ b/registry/consul/go.mod
@@ -0,0 +1,48 @@
+module github.com/tx7do/kratos-bootstrap/registry/consul
+
+go 1.24.0
+
+toolchain go1.24.3
+
+replace (
+	github.com/armon/go-metrics => github.com/hashicorp/go-metrics v0.4.1
+
+	github.com/tx7do/kratos-bootstrap/api => ../../api
+	github.com/tx7do/kratos-bootstrap/registry => ../registry
+)
+
+require (
+	github.com/go-kratos/kratos/v2 v2.8.4
+	github.com/hashicorp/consul/api v1.32.1
+	github.com/stretchr/testify v1.10.0
+	github.com/tx7do/kratos-bootstrap/api v0.0.20
+)
+
+require (
+	github.com/armon/go-metrics v0.5.4 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/fatih/color v1.18.0 // indirect
+	github.com/google/btree v1.1.3 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-hclog v1.6.3 // indirect
+	github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
+	github.com/hashicorp/go-metrics v0.5.4 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+	github.com/hashicorp/golang-lru v1.0.2 // indirect
+	github.com/hashicorp/serf v0.10.2 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/rogpeppe/go-internal v1.13.1 // indirect
+	golang.org/x/exp v0.0.0-20250531010427-b6e5de432a8b // indirect
+	golang.org/x/net v0.40.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+	google.golang.org/protobuf v1.36.6 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
--- a/registry/consul/go.sum
+++ b/registry/consul/go.sum
@@ -0,0 +1,244 @@
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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--- a/registry/consul/options.go
+++ b/registry/consul/options.go
@@ -0,0 +1,75 @@
+package consul
+
+import (
+	"github.com/hashicorp/consul/api"
+	"time"
+)
+
+// Option is consul registry option.
+type Option func(*Registry)
+
+// WithHealthCheck with registry health check option.
+func WithHealthCheck(enable bool) Option {
+	return func(o *Registry) {
+		o.enableHealthCheck = enable
+	}
+}
+
+// WithTimeout with get services timeout option.
+func WithTimeout(timeout time.Duration) Option {
+	return func(o *Registry) {
+		o.timeout = timeout
+	}
+}
+
+// WithDatacenter with registry datacenter option
+func WithDatacenter(dc Datacenter) Option {
+	return func(o *Registry) {
+		o.cli.dc = dc
+	}
+}
+
+// WithHeartbeat enable or disable heartbeat
+func WithHeartbeat(enable bool) Option {
+	return func(o *Registry) {
+		if o.cli != nil {
+			o.cli.heartbeat = enable
+		}
+	}
+}
+
+// WithServiceResolver with endpoint function option.
+func WithServiceResolver(fn ServiceResolver) Option {
+	return func(o *Registry) {
+		if o.cli != nil {
+			o.cli.resolver = fn
+		}
+	}
+}
+
+// WithHealthCheckInterval with healthcheck interval in seconds.
+func WithHealthCheckInterval(interval int) Option {
+	return func(o *Registry) {
+		if o.cli != nil {
+			o.cli.healthcheckInterval = interval
+		}
+	}
+}
+
+// WithDeregisterCriticalServiceAfter with deregister-critical-service-after in seconds.
+func WithDeregisterCriticalServiceAfter(interval int) Option {
+	return func(o *Registry) {
+		if o.cli != nil {
+			o.cli.deregisterCriticalServiceAfter = interval
+		}
+	}
+}
+
+// WithServiceCheck with service checks
+func WithServiceCheck(checks ...*api.AgentServiceCheck) Option {
+	return func(o *Registry) {
+		if o.cli != nil {
+			o.cli.serviceChecks = checks
+		}
+	}
+}
--- a/registry/consul/registry.go
+++ b/registry/consul/registry.go
@@ -0,0 +1,189 @@
+package consul
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/hashicorp/consul/api"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+var (
+	_ registry.Registrar = (*Registry)(nil)
+	_ registry.Discovery = (*Registry)(nil)
+)
+
+// Config is consul registry config
+type Config struct {
+	*api.Config
+}
+
+// Registry is consul registry
+type Registry struct {
+	cli               *Client
+	enableHealthCheck bool
+	registry          map[string]*serviceSet
+	lock              sync.RWMutex
+	timeout           time.Duration
+}
+
+// New creates consul registry
+func New(apiClient *api.Client, opts ...Option) *Registry {
+	r := &Registry{
+		registry:          make(map[string]*serviceSet),
+		enableHealthCheck: true,
+		timeout:           10 * time.Second,
+		cli: &Client{
+			dc:                             SingleDatacenter,
+			cli:                            apiClient,
+			resolver:                       defaultResolver,
+			healthcheckInterval:            10,
+			heartbeat:                      true,
+			deregisterCriticalServiceAfter: 600,
+		},
+	}
+	for _, o := range opts {
+		o(r)
+	}
+	r.cli.ctx, r.cli.cancel = context.WithCancel(context.Background())
+	return r
+}
+
+// Register register service
+func (r *Registry) Register(ctx context.Context, svc *registry.ServiceInstance) error {
+	return r.cli.Register(ctx, svc, r.enableHealthCheck)
+}
+
+// Deregister deregister service
+func (r *Registry) Deregister(ctx context.Context, svc *registry.ServiceInstance) error {
+	return r.cli.Deregister(ctx, svc.ID)
+}
+
+// GetService return service by name
+func (r *Registry) GetService(ctx context.Context, name string) ([]*registry.ServiceInstance, error) {
+	r.lock.RLock()
+	defer r.lock.RUnlock()
+	set := r.registry[name]
+
+	getRemote := func() []*registry.ServiceInstance {
+		services, _, err := r.cli.Service(ctx, name, 0, true)
+		if err == nil && len(services) > 0 {
+			return services
+		}
+		return nil
+	}
+
+	if set == nil {
+		if s := getRemote(); len(s) > 0 {
+			return s, nil
+		}
+		return nil, fmt.Errorf("service %s not resolved in registry", name)
+	}
+	ss, _ := set.services.Load().([]*registry.ServiceInstance)
+	if ss == nil {
+		if s := getRemote(); len(s) > 0 {
+			return s, nil
+		}
+		return nil, fmt.Errorf("service %s not found in registry", name)
+	}
+	return ss, nil
+}
+
+// ListServices return service list.
+func (r *Registry) ListServices() (allServices map[string][]*registry.ServiceInstance, err error) {
+	r.lock.RLock()
+	defer r.lock.RUnlock()
+	allServices = make(map[string][]*registry.ServiceInstance)
+	for name, set := range r.registry {
+		var services []*registry.ServiceInstance
+		ss, _ := set.services.Load().([]*registry.ServiceInstance)
+		if ss == nil {
+			continue
+		}
+		services = append(services, ss...)
+		allServices[name] = services
+	}
+	return
+}
+
+// Watch resolve service by name
+func (r *Registry) Watch(ctx context.Context, name string) (registry.Watcher, error) {
+	r.lock.Lock()
+	defer r.lock.Unlock()
+	set, ok := r.registry[name]
+	if !ok {
+		set = &serviceSet{
+			watcher:     make(map[*watcher]struct{}),
+			services:    &atomic.Value{},
+			serviceName: name,
+		}
+		r.registry[name] = set
+	}
+
+	// init watcher
+	w := &watcher{
+		event: make(chan struct{}, 1),
+	}
+	w.ctx, w.cancel = context.WithCancel(ctx)
+	w.set = set
+	set.lock.Lock()
+	set.watcher[w] = struct{}{}
+	set.lock.Unlock()
+	ss, _ := set.services.Load().([]*registry.ServiceInstance)
+	if len(ss) > 0 {
+		// If the service has a value, it needs to be pushed to the watcher,
+		// otherwise the initial data may be blocked forever during the watch.
+		w.event <- struct{}{}
+	}
+
+	if !ok {
+		err := r.resolve(ctx, set)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return w, nil
+}
+
+func (r *Registry) resolve(ctx context.Context, ss *serviceSet) error {
+	timeoutCtx, cancel := context.WithTimeout(ctx, r.timeout)
+	defer cancel()
+
+	services, idx, err := r.cli.Service(timeoutCtx, ss.serviceName, 0, true)
+	if err != nil {
+		return err
+	}
+	if len(services) > 0 {
+		ss.broadcast(services)
+	}
+
+	go func() {
+		ticker := time.NewTicker(time.Second)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ticker.C:
+				timeoutCtx, cancel := context.WithTimeout(context.Background(), r.timeout)
+				tmpService, tmpIdx, err := r.cli.Service(timeoutCtx, ss.serviceName, idx, true)
+				cancel()
+				if err != nil {
+					time.Sleep(time.Second)
+					continue
+				}
+				if len(tmpService) != 0 && tmpIdx != idx {
+					services = tmpService
+					ss.broadcast(services)
+				}
+				idx = tmpIdx
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+
+	return nil
+}
--- a/registry/consul/registry_test.go
+++ b/registry/consul/registry_test.go
@@ -0,0 +1,430 @@
+package consul
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/hashicorp/consul/api"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+func tcpServer(lis net.Listener) {
+	for {
+		conn, err := lis.Accept()
+		if err != nil {
+			return
+		}
+		fmt.Println("get tcp")
+		conn.Close()
+	}
+}
+
+func TestRegistry_Register(t *testing.T) {
+	opts := []Option{
+		WithHealthCheck(false),
+	}
+
+	type args struct {
+		ctx        context.Context
+		serverName string
+		server     []*registry.ServiceInstance
+	}
+
+	test := []struct {
+		name    string
+		args    args
+		want    []*registry.ServiceInstance
+		wantErr bool
+	}{
+		{
+			name: "normal",
+			args: args{
+				ctx:        context.Background(),
+				serverName: "server-1",
+				server: []*registry.ServiceInstance{
+					{
+						ID:        "1",
+						Name:      "server-1",
+						Version:   "v0.0.1",
+						Metadata:  nil,
+						Endpoints: []string{"http://127.0.0.1:8000"},
+					},
+				},
+			},
+			want: []*registry.ServiceInstance{
+				{
+					ID:        "1",
+					Name:      "server-1",
+					Version:   "v0.0.1",
+					Metadata:  nil,
+					Endpoints: []string{"http://127.0.0.1:8000"},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "registry new service replace old service",
+			args: args{
+				ctx:        context.Background(),
+				serverName: "server-1",
+				server: []*registry.ServiceInstance{
+					{
+						ID:        "2",
+						Name:      "server-1",
+						Version:   "v0.0.1",
+						Metadata:  nil,
+						Endpoints: []string{"http://127.0.0.1:8000"},
+					},
+					{
+						ID:        "2",
+						Name:      "server-1",
+						Version:   "v0.0.2",
+						Metadata:  nil,
+						Endpoints: []string{"http://127.0.0.1:8000"},
+					},
+				},
+			},
+			want: []*registry.ServiceInstance{
+				{
+					ID:        "2",
+					Name:      "server-1",
+					Version:   "v0.0.2",
+					Metadata:  nil,
+					Endpoints: []string{"http://127.0.0.1:8000"},
+				},
+			},
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range test {
+		t.Run(tt.name, func(t *testing.T) {
+			cli, err := api.NewClient(&api.Config{Address: "127.0.0.1:8500"})
+			if err != nil {
+				t.Fatalf("create consul client failed: %v", err)
+			}
+
+			r := New(cli, opts...)
+
+			for _, instance := range tt.args.server {
+				err = r.Register(tt.args.ctx, instance)
+				if err != nil {
+					t.Error(err)
+				}
+			}
+
+			watch, err := r.Watch(tt.args.ctx, tt.args.serverName)
+			if err != nil {
+				t.Error(err)
+			}
+			got, err := watch.Next()
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("GetService() error = %v, wantErr %v", err, tt.wantErr)
+				t.Errorf("GetService() got = %v", got)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("GetService() got = %v, want %v", got, tt.want)
+			}
+
+			for _, instance := range tt.args.server {
+				_ = r.Deregister(tt.args.ctx, instance)
+			}
+		})
+	}
+}
+
+func TestRegistry_GetService(t *testing.T) {
+	addr := fmt.Sprintf("%s:9091", getIntranetIP())
+	lis, err := net.Listen("tcp", addr)
+	if err != nil {
+		t.Errorf("listen tcp %s failed!", addr)
+		t.Fail()
+	}
+	defer lis.Close()
+	go tcpServer(lis)
+	time.Sleep(time.Millisecond * 100)
+	cli, err := api.NewClient(&api.Config{Address: "127.0.0.1:8500"})
+	if err != nil {
+		t.Fatalf("create consul client failed: %v", err)
+	}
+	opts := []Option{
+		WithHeartbeat(true),
+		WithHealthCheck(true),
+		WithHealthCheckInterval(5),
+	}
+	r := New(cli, opts...)
+
+	instance1 := &registry.ServiceInstance{
+		ID:        "1",
+		Name:      "server-1",
+		Version:   "v0.0.1",
+		Endpoints: []string{fmt.Sprintf("tcp://%s?isSecure=false", addr)},
+	}
+
+	instance2 := &registry.ServiceInstance{
+		ID:        "2",
+		Name:      "server-1",
+		Version:   "v0.0.1",
+		Endpoints: []string{fmt.Sprintf("tcp://%s?isSecure=false", addr)},
+	}
+
+	type fields struct {
+		registry *Registry
+	}
+	type args struct {
+		ctx         context.Context
+		serviceName string
+	}
+	tests := []struct {
+		name      string
+		fields    fields
+		args      args
+		want      []*registry.ServiceInstance
+		wantErr   bool
+		preFunc   func(t *testing.T)
+		deferFunc func(t *testing.T)
+	}{
+		{
+			name:   "normal",
+			fields: fields{r},
+			args: args{
+				ctx:         context.Background(),
+				serviceName: "server-1",
+			},
+			want:    []*registry.ServiceInstance{instance1},
+			wantErr: false,
+			preFunc: func(t *testing.T) {
+				if err := r.Register(context.Background(), instance1); err != nil {
+					t.Error(err)
+				}
+				watch, err := r.Watch(context.Background(), instance1.Name)
+				if err != nil {
+					t.Error(err)
+				}
+				_, err = watch.Next()
+				if err != nil {
+					t.Error(err)
+				}
+			},
+			deferFunc: func(t *testing.T) {
+				err := r.Deregister(context.Background(), instance1)
+				if err != nil {
+					t.Error(err)
+				}
+			},
+		},
+		{
+			name:   "can't get any",
+			fields: fields{r},
+			args: args{
+				ctx:         context.Background(),
+				serviceName: "server-x",
+			},
+			want:    nil,
+			wantErr: true,
+			preFunc: func(t *testing.T) {
+				if err := r.Register(context.Background(), instance2); err != nil {
+					t.Error(err)
+				}
+				watch, err := r.Watch(context.Background(), instance2.Name)
+				if err != nil {
+					t.Error(err)
+				}
+				_, err = watch.Next()
+				if err != nil {
+					t.Error(err)
+				}
+			},
+			deferFunc: func(t *testing.T) {
+				err := r.Deregister(context.Background(), instance2)
+				if err != nil {
+					t.Error(err)
+				}
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if test.preFunc != nil {
+				test.preFunc(t)
+			}
+			if test.deferFunc != nil {
+				defer test.deferFunc(t)
+			}
+
+			service, err := test.fields.registry.GetService(context.Background(), test.args.serviceName)
+			if (err != nil) != test.wantErr {
+				t.Errorf("GetService() error = %v, wantErr %v", err, test.wantErr)
+				t.Errorf("GetService() got = %v", service)
+				return
+			}
+			if !reflect.DeepEqual(service, test.want) {
+				t.Errorf("GetService() got = %v, want %v", service, test.want)
+			}
+		})
+	}
+}
+
+func TestRegistry_Watch(t *testing.T) {
+	addr := fmt.Sprintf("%s:9091", getIntranetIP())
+
+	time.Sleep(time.Millisecond * 100)
+	cli, err := api.NewClient(&api.Config{Address: "127.0.0.1:8500", WaitTime: 2 * time.Second})
+	if err != nil {
+		t.Fatalf("create consul client failed: %v", err)
+	}
+
+	instance1 := &registry.ServiceInstance{
+		ID:        "1",
+		Name:      "server-1",
+		Version:   "v0.0.1",
+		Endpoints: []string{fmt.Sprintf("tcp://%s?isSecure=false", addr)},
+	}
+
+	instance2 := &registry.ServiceInstance{
+		ID:        "2",
+		Name:      "server-1",
+		Version:   "v0.0.1",
+		Endpoints: []string{fmt.Sprintf("tcp://%s?isSecure=false", addr)},
+	}
+
+	instance3 := &registry.ServiceInstance{
+		ID:        "3",
+		Name:      "server-1",
+		Version:   "v0.0.1",
+		Endpoints: []string{fmt.Sprintf("tcp://%s?isSecure=false", addr)},
+	}
+
+	type args struct {
+		ctx      context.Context
+		cancel   func()
+		opts     []Option
+		instance *registry.ServiceInstance
+	}
+	canceledCtx, cancel := context.WithCancel(context.Background())
+
+	tests := []struct {
+		name    string
+		args    args
+		want    []*registry.ServiceInstance
+		wantErr bool
+		preFunc func(t *testing.T)
+	}{
+		{
+			name: "normal",
+			args: args{
+				ctx:      context.Background(),
+				instance: instance1,
+				opts: []Option{
+					WithHealthCheck(false),
+				},
+			},
+			want:    []*registry.ServiceInstance{instance1},
+			wantErr: false,
+			preFunc: func(t *testing.T) {
+			},
+		},
+		{
+			name: "ctx has been cancelled",
+			args: args{
+				ctx:      canceledCtx,
+				cancel:   cancel,
+				instance: instance2,
+				opts: []Option{
+					WithHealthCheck(false),
+				},
+			},
+			want:    nil,
+			wantErr: true,
+			preFunc: func(t *testing.T) {
+			},
+		},
+		{
+			name: "register with healthCheck",
+			args: args{
+				ctx:      context.Background(),
+				instance: instance3,
+				opts: []Option{
+					WithHeartbeat(true),
+					WithHealthCheck(true),
+					WithHealthCheckInterval(5),
+				},
+			},
+			want:    []*registry.ServiceInstance{instance3},
+			wantErr: false,
+			preFunc: func(t *testing.T) {
+				lis, err := net.Listen("tcp", addr)
+				if err != nil {
+					t.Errorf("listen tcp %s failed!", addr)
+					return
+				}
+				go tcpServer(lis)
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.preFunc != nil {
+				tt.preFunc(t)
+			}
+
+			r := New(cli, tt.args.opts...)
+
+			err := r.Register(tt.args.ctx, tt.args.instance)
+			if err != nil {
+				t.Error(err)
+			}
+			defer func() {
+				err = r.Deregister(tt.args.ctx, tt.args.instance)
+				if err != nil {
+					t.Error(err)
+				}
+			}()
+
+			watch, err := r.Watch(tt.args.ctx, tt.args.instance.Name)
+			if err != nil {
+				t.Error(err)
+			}
+
+			if tt.args.cancel != nil {
+				tt.args.cancel()
+			}
+
+			service, err := watch.Next()
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("GetService() error = %v, wantErr %v", err, tt.wantErr)
+				t.Errorf("GetService() got = %v", service)
+				return
+			}
+			if !reflect.DeepEqual(service, tt.want) {
+				t.Errorf("GetService() got = %v, want %v", service, tt.want)
+			}
+		})
+	}
+}
+
+func getIntranetIP() string {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		return "127.0.0.1"
+	}
+
+	for _, address := range addrs {
+		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+			if ipnet.IP.To4() != nil {
+				return ipnet.IP.String()
+			}
+		}
+	}
+	return "127.0.0.1"
+}
--- a/registry/consul/service.go
+++ b/registry/consul/service.go
@@ -0,0 +1,27 @@
+package consul
+
+import (
+	"sync"
+	"sync/atomic"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+type serviceSet struct {
+	serviceName string
+	watcher     map[*watcher]struct{}
+	services    *atomic.Value
+	lock        sync.RWMutex
+}
+
+func (s *serviceSet) broadcast(ss []*registry.ServiceInstance) {
+	s.services.Store(ss)
+	s.lock.RLock()
+	defer s.lock.RUnlock()
+	for k := range s.watcher {
+		select {
+		case k.event <- struct{}{}:
+		default:
+		}
+	}
+}
--- a/registry/consul/watcher.go
+++ b/registry/consul/watcher.go
@@ -0,0 +1,40 @@
+package consul
+
+import (
+	"context"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+type watcher struct {
+	event chan struct{}
+	set   *serviceSet
+
+	// for cancel
+	ctx    context.Context
+	cancel context.CancelFunc
+}
+
+func (w *watcher) Next() (services []*registry.ServiceInstance, err error) {
+	select {
+	case <-w.ctx.Done():
+		err = w.ctx.Err()
+		return
+	case <-w.event:
+	}
+
+	ss, ok := w.set.services.Load().([]*registry.ServiceInstance)
+
+	if ok {
+		services = append(services, ss...)
+	}
+	return
+}
+
+func (w *watcher) Stop() error {
+	w.cancel()
+	w.set.lock.Lock()
+	defer w.set.lock.Unlock()
+	delete(w.set.watcher, w)
+	return nil
+}