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序
本文次要钻研一下 dubbo-go 的 nacosRegistry
nacosRegistry
dubbo-go-v1.4.2/registry/nacos/registry.go
var (localIP = "")
const (
//RegistryConnDelay registry connection delay
RegistryConnDelay = 3
)
func init() {localIP, _ = gxnet.GetLocalIP()
extension.SetRegistry(constant.NACOS_KEY, newNacosRegistry)
}
type nacosRegistry struct {
*common.URL
namingClient naming_client.INamingClient
}
- nacosRegistry 定义了 common.URL、namingClient 属性
newNacosRegistry
dubbo-go-v1.4.2/registry/nacos/registry.go
func newNacosRegistry(url *common.URL) (registry.Registry, error) {nacosConfig, err := getNacosConfig(url)
if err != nil {return nil, err}
client, err := clients.CreateNamingClient(nacosConfig)
if err != nil {return nil, err}
registry := nacosRegistry{
URL: url,
namingClient: client,
}
return ®istry, nil
}
- newNacosRegistry 办法先通过 getNacosConfig 获取 nacosConfig,之后通过 clients.CreateNamingClient(nacosConfig) 创立 client,最初实例化 nacosRegistry
getNacosConfig
dubbo-go-v1.4.2/registry/nacos/registry.go
func getNacosConfig(url *common.URL) (map[string]interface{}, error) {
if url == nil {return nil, perrors.New("url is empty!")
}
if len(url.Location) == 0 {return nil, perrors.New("url.location is empty!")
}
configMap := make(map[string]interface{}, 2)
addresses := strings.Split(url.Location, ",")
serverConfigs := make([]nacosConstant.ServerConfig, 0, len(addresses))
for _, addr := range addresses {ip, portStr, err := net.SplitHostPort(addr)
if err != nil {return nil, perrors.WithMessagef(err, "split [%s]", addr)
}
port, _ := strconv.Atoi(portStr)
serverConfigs = append(serverConfigs, nacosConstant.ServerConfig{
IpAddr: ip,
Port: uint64(port),
})
}
configMap["serverConfigs"] = serverConfigs
var clientConfig nacosConstant.ClientConfig
timeout, err := time.ParseDuration(url.GetParam(constant.REGISTRY_TIMEOUT_KEY, constant.DEFAULT_REG_TIMEOUT))
if err != nil {return nil, err}
clientConfig.TimeoutMs = uint64(timeout.Seconds() * 1000)
clientConfig.ListenInterval = 2 * clientConfig.TimeoutMs
clientConfig.CacheDir = url.GetParam(constant.NACOS_CACHE_DIR_KEY, "")
clientConfig.LogDir = url.GetParam(constant.NACOS_LOG_DIR_KEY, "")
clientConfig.Endpoint = url.GetParam(constant.NACOS_ENDPOINT, "")
clientConfig.Username = url.GetParam(constant.NACOS_USERNAME, "")
clientConfig.Password = url.GetParam(constant.NACOS_PASSWORD, "")
clientConfig.NamespaceId = url.GetParam(constant.NACOS_NAMESPACEID, "")
clientConfig.NotLoadCacheAtStart = true
configMap["clientConfig"] = clientConfig
return configMap, nil
}
- getNacosConfig 办法解析 url.Location 为 addresses,而后遍历 addresses 创立 serverConfigs,之后设置 clientConfig 的参数,最初返回 configMap
Register
dubbo-go-v1.4.2/registry/nacos/registry.go
func (nr *nacosRegistry) Register(url common.URL) error {serviceName := getServiceName(url)
param := createRegisterParam(url, serviceName)
isRegistry, err := nr.namingClient.RegisterInstance(param)
if err != nil {return err}
if !isRegistry {return perrors.New("registry [" + serviceName + "] to nacos failed")
}
return nil
}
- Register 办法通过 getServiceName(url) 获取 serviceName,之后通过 createRegisterParam(url, serviceName) 创立注册参数,最初通过 nr.namingClient.RegisterInstance(param) 执行注册
Subscribe
dubbo-go-v1.4.2/registry/nacos/registry.go
//subscribe from registry
func (nr *nacosRegistry) Subscribe(url *common.URL, notifyListener registry.NotifyListener) {
for {if !nr.IsAvailable() {logger.Warnf("event listener game over.")
return
}
listener, err := nr.subscribe(url)
if err != nil {if !nr.IsAvailable() {logger.Warnf("event listener game over.")
return
}
logger.Warnf("getListener() = err:%v", perrors.WithStack(err))
time.Sleep(time.Duration(RegistryConnDelay) * time.Second)
continue
}
for {serviceEvent, err := listener.Next()
if err != nil {logger.Warnf("Selector.watch() = error{%v}", perrors.WithStack(err))
listener.Close()
return
}
logger.Infof("update begin, service event: %v", serviceEvent.String())
notifyListener.Notify(serviceEvent)
}
}
}
- Subscribe 办法执行 nr.subscribe(url) 获取 listener,而后通过 listener.Next() 获取 serviceEvent,而后通过 notifyListener.Notify(serviceEvent) 公布 serviceEvent
小结
newNacosRegistry 办法先通过 getNacosConfig 获取 nacosConfig,之后通过 clients.CreateNamingClient(nacosConfig) 创立 client,最初实例化 nacosRegistry
doc
- registry
正文完