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support nacos registry #151
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,199 @@ | ||
| package nacos | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "net/url" | ||
| "reflect" | ||
| "strconv" | ||
| "sync" | ||
| ) | ||
|
|
||
| import ( | ||
| "github.com/nacos-group/nacos-sdk-go/clients/naming_client" | ||
| "github.com/nacos-group/nacos-sdk-go/model" | ||
| "github.com/nacos-group/nacos-sdk-go/vo" | ||
| perrors "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| import ( | ||
| "github.com/apache/dubbo-go/common" | ||
| "github.com/apache/dubbo-go/common/constant" | ||
| "github.com/apache/dubbo-go/common/logger" | ||
| "github.com/apache/dubbo-go/registry" | ||
| "github.com/apache/dubbo-go/remoting" | ||
| ) | ||
|
|
||
| type nacosListener struct { | ||
| namingClient naming_client.INamingClient | ||
| listenUrl common.URL | ||
| events chan *remoting.ConfigChangeEvent | ||
| instanceMap map[string]model.Instance | ||
| cacheLock sync.Mutex | ||
| done chan struct{} | ||
| subscribeParam *vo.SubscribeParam | ||
| } | ||
|
|
||
| func NewNacosListener(url common.URL, namingClient naming_client.INamingClient) (*nacosListener, error) { | ||
| listener := &nacosListener{ | ||
| namingClient: namingClient, | ||
| listenUrl: url, events: make(chan *remoting.ConfigChangeEvent, 32), | ||
| instanceMap: map[string]model.Instance{}, | ||
| done: make(chan struct{}), | ||
| } | ||
| err := listener.startListen() | ||
| return listener, err | ||
| } | ||
|
|
||
| func generateInstance(ss model.SubscribeService) model.Instance { | ||
| return model.Instance{ | ||
| InstanceId: ss.InstanceId, | ||
| Ip: ss.Ip, | ||
| Port: ss.Port, | ||
| ServiceName: ss.ServiceName, | ||
| Valid: ss.Valid, | ||
| Enable: ss.Enable, | ||
| Weight: ss.Weight, | ||
| Metadata: ss.Metadata, | ||
| ClusterName: ss.ClusterName, | ||
| } | ||
| } | ||
|
|
||
| func generateUrl(instance model.Instance) *common.URL { | ||
| if instance.Metadata == nil { | ||
| logger.Errorf("nacos instance metadata is empty,instance:%+v", instance) | ||
| return nil | ||
| } | ||
| path := instance.Metadata["path"] | ||
| myInterface := instance.Metadata["interface"] | ||
| if len(path) == 0 && len(myInterface) == 0 { | ||
| logger.Errorf("nacos instance metadata does not have both path key and interface key,instance:%+v", instance) | ||
| return nil | ||
| } | ||
| if len(path) == 0 && len(myInterface) != 0 { | ||
| path = "/" + myInterface | ||
| } | ||
| protocol := instance.Metadata["protocol"] | ||
| if len(protocol) == 0 { | ||
| logger.Errorf("nacos instance metadata does not have protocol key,instance:%+v", instance) | ||
| return nil | ||
| } | ||
| urlMap := url.Values{} | ||
| for k, v := range instance.Metadata { | ||
| urlMap.Set(k, v) | ||
| } | ||
| return common.NewURLWithOptions( | ||
| common.WithIp(instance.Ip), | ||
| common.WithPort(strconv.Itoa(int(instance.Port))), | ||
| common.WithProtocol(protocol), | ||
| common.WithParams(urlMap), | ||
| common.WithPath(path), | ||
| ) | ||
| } | ||
|
|
||
| func (nl *nacosListener) Callback(services []model.SubscribeService, err error) { | ||
| if err != nil { | ||
| logger.Errorf("nacos subscribe callback error:%s , subscribe:%+v ", err.Error(), nl.subscribeParam) | ||
| return | ||
| } | ||
| nl.cacheLock.Lock() | ||
| defer nl.cacheLock.Unlock() | ||
| addInstances := make([]model.Instance, 0, len(services)) | ||
| delInstances := make([]model.Instance, 0, len(services)) | ||
| updateInstances := make([]model.Instance, 0, len(services)) | ||
|
|
||
| newInstanceMap := make(map[string]model.Instance, len(services)) | ||
|
|
||
| for i := range services { | ||
| if !services[i].Enable || !services[i].Valid { | ||
| // instance is not available,so ignore it | ||
| continue | ||
| } | ||
| host := services[i].Ip + ":" + strconv.Itoa(int(services[i].Port)) | ||
| instance := generateInstance(services[i]) | ||
| newInstanceMap[host] = instance | ||
| if old, ok := nl.instanceMap[host]; !ok { | ||
| //instance is not exsit in cache,add it to cache | ||
| addInstances = append(addInstances, instance) | ||
| } else { | ||
| //instance is not different from cache,update it to cache | ||
| if !reflect.DeepEqual(old, instance) { | ||
| updateInstances = append(updateInstances, instance) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| for host, inst := range nl.instanceMap { | ||
| if _, ok := newInstanceMap[host]; !ok { | ||
| //cache instance is not exsit in new instance list, remove it from cache | ||
| delInstances = append(delInstances, inst) | ||
| } | ||
| } | ||
|
|
||
| nl.instanceMap = newInstanceMap | ||
|
|
||
| for i := range addInstances { | ||
| newUrl := generateUrl(addInstances[i]) | ||
| if newUrl != nil { | ||
| nl.process(&remoting.ConfigChangeEvent{Value: *newUrl, ConfigType: remoting.EventTypeAdd}) | ||
| } | ||
| } | ||
| for i := range delInstances { | ||
| newUrl := generateUrl(delInstances[i]) | ||
| if newUrl != nil { | ||
| nl.process(&remoting.ConfigChangeEvent{Value: *newUrl, ConfigType: remoting.EventTypeDel}) | ||
| } | ||
| } | ||
|
|
||
| for i := range updateInstances { | ||
| newUrl := generateUrl(updateInstances[i]) | ||
| if newUrl != nil { | ||
| nl.process(&remoting.ConfigChangeEvent{Value: *newUrl, ConfigType: remoting.EvnetTypeUpdate}) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func getSubscribeName(url common.URL) string { | ||
| var buffer bytes.Buffer | ||
|
|
||
| buffer.Write([]byte(common.DubboNodes[common.PROVIDER])) | ||
| appendParam(&buffer, url, constant.INTERFACE_KEY) | ||
| appendParam(&buffer, url, constant.VERSION_KEY) | ||
| appendParam(&buffer, url, constant.GROUP_KEY) | ||
| return buffer.String() | ||
| } | ||
|
|
||
| func (nl *nacosListener) startListen() error { | ||
| if nl.namingClient == nil { | ||
| return perrors.New("nacos naming client stopped") | ||
| } | ||
| serviceName := getSubscribeName(nl.listenUrl) | ||
| nl.subscribeParam = &vo.SubscribeParam{ServiceName: serviceName, SubscribeCallback: nl.Callback} | ||
| return nl.namingClient.Subscribe(nl.subscribeParam) | ||
| } | ||
|
|
||
| func (nl *nacosListener) stopListen() error { | ||
| return nl.namingClient.Unsubscribe(nl.subscribeParam) | ||
| } | ||
|
|
||
| func (nl *nacosListener) process(configType *remoting.ConfigChangeEvent) { | ||
| nl.events <- configType | ||
| } | ||
|
|
||
| func (nl *nacosListener) Next() (*registry.ServiceEvent, error) { | ||
| for { | ||
| select { | ||
| case <-nl.done: | ||
| logger.Warnf("nacos listener is close!listenUrl:%+v", nl.listenUrl) | ||
| return nil, perrors.New("listener stopped") | ||
|
|
||
| case e := <-nl.events: | ||
| logger.Debugf("got nacos event %s", e) | ||
| return ®istry.ServiceEvent{Action: e.ConfigType, Service: e.Value.(common.URL)}, nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (nl *nacosListener) Close() { | ||
| nl.stopListen() | ||
| close(nl.done) | ||
| } | ||
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a var block "var (
addInstances []model.Instance
delInstances []model.Instance
updateInstances []model.Instance
)" pls.