notify event on remote config changed

config_remote_provider.go

@@ -1,6 +1,7 @@
 package nacos_viper_remote
 
 import (
+	"bytes"
 	"fmt"
 	"github.com/spf13/viper"
 )
@@ -16,9 +17,9 @@ func NewRemoteProvider(configType string) *ViperRemoteProvider {
 		configSet:  "yoyogo.cloud.discovery.metadata"}
 }
 
-func (provider *ViperRemoteProvider) GetProvider(runtime_viper *viper.Viper) *viper.Viper {
+func (provider *ViperRemoteProvider) GetProvider(runtimeViper *viper.Viper) *viper.Viper {
 	var option *Option
-	err := runtime_viper.Sub(provider.configSet).Unmarshal(&option)
+	err := runtimeViper.Sub(provider.configSet).Unmarshal(&option)
 	if err != nil {
 		panic(err)
 		return nil
@@ -32,7 +33,7 @@ func (provider *ViperRemoteProvider) GetProvider(runtime_viper *viper.Viper) *vi
 	remote_viper.SetConfigType(provider.configType)
 	err = remote_viper.ReadRemoteConfig()
 	if err == nil {
-		err = remote_viper.WatchRemoteConfigOnChannel()
+		//err = remote_viper.WatchRemoteConfigOnChannel()
 		if err == nil {
 			fmt.Println("used remote viper")
 			return remote_viper
@@ -40,5 +41,22 @@ func (provider *ViperRemoteProvider) GetProvider(runtime_viper *viper.Viper) *vi
 	} else {
 		panic(err)
 	}
-	return runtime_viper
+	return runtimeViper
+}
+
+func (provider *ViperRemoteProvider) WatchRemoteConfigOnChannel(remoteViper *viper.Viper) <-chan bool {
+	updater := make(chan bool)
+
+	respChan, _ := viper.RemoteConfig.WatchChannel(DefaultRemoteProvider())
+	go func(rc <-chan *viper.RemoteResponse) {
+		for {
+			b := <-rc
+			reader := bytes.NewReader(b.Value)
+			_ = remoteViper.ReadConfig(reader)
+			// configuration on changed
+			updater <- true
+		}
+	}(respChan)
+
+	return updater
 }

example/main.go

@@ -32,14 +32,21 @@ func main() {
 	remote_viper := viper.New()
 	err := remote_viper.AddRemoteProvider("nacos", "localhost", "")
 	remote_viper.SetConfigType("yaml")
-
 	err = remote_viper.ReadRemoteConfig()
-	if err == nil {
-		err = remote_viper.WatchRemoteConfigOnChannel()
+
 	if err == nil {
 		config_viper = remote_viper
 		fmt.Println("used remote viper")
+		provider := remote.NewRemoteProvider("yaml")
+		respChan := provider.WatchRemoteConfigOnChannel(config_viper)
+
+		go func(rc <-chan bool) {
+			for {
+				<-rc
+				fmt.Printf("remote async: %s", config_viper.GetString("yoyogo.application.name"))
 			}
+		}(respChan)
+
 	}
 
 	appName := config_viper.GetString("yoyogo.application.name")
@@ -50,7 +57,7 @@ func main() {
 		for {
 			time.Sleep(time.Second * 30) // delay after each request
 			appName = config_viper.GetString("yoyogo.application.name")
-			fmt.Println(appName)
+			fmt.Println("sync:" + appName)
 		}
 	}()
 

nacosprovider.go

@@ -0,0 +1,28 @@
+package nacos_viper_remote
+
+type nacosRemoteProvider struct {
+	provider      string
+	endpoint      string
+	path          string
+	secretKeyring string
+}
+
+func DefaultRemoteProvider() *nacosRemoteProvider {
+	return &nacosRemoteProvider{provider: "nacos", endpoint: "localhost", path: "", secretKeyring: ""}
+}
+
+func (rp nacosRemoteProvider) Provider() string {
+	return rp.provider
+}
+
+func (rp nacosRemoteProvider) Endpoint() string {
+	return rp.endpoint
+}
+
+func (rp nacosRemoteProvider) Path() string {
+	return rp.path
+}
+
+func (rp nacosRemoteProvider) SecretKeyring() string {
+	return rp.secretKeyring
+}

viper_remote.go

@@ -7,17 +7,20 @@ import (
 	"io"
 )
 
-var nacosOptions = &Option{}
+//var nacosOptions = &Option{}
 
 func SetOptions(option *Option) {
-	nacosOptions = option
+	manager, _ := NewNacosConfigManager(option)
+	viper.SupportedRemoteProviders = []string{"nacos"}
+	viper.RemoteConfig = &remoteConfigProvider{ConfigManager: manager}
 }
 
 type remoteConfigProvider struct {
+	ConfigManager *nacosConfigManager
 }
 
 func (rc *remoteConfigProvider) Get(rp viper.RemoteProvider) (io.Reader, error) {
-	cmt, err := getConfigManager(rp)
+	cmt, err := rc.getConfigManager(rp)
 	if err != nil {
 		return nil, err
 	}
@@ -37,7 +40,7 @@ func (rc *remoteConfigProvider) Watch(rp viper.RemoteProvider) (io.Reader, error
 }
 
 func (rc *remoteConfigProvider) WatchChannel(rp viper.RemoteProvider) (<-chan *viper.RemoteResponse, chan bool) {
-	cmt, err := getConfigManager(rp)
+	cmt, err := rc.getConfigManager(rp)
 	if err != nil {
 		return nil, nil
 	}
@@ -52,15 +55,10 @@ func (rc *remoteConfigProvider) WatchChannel(rp viper.RemoteProvider) (<-chan *v
 	return nil, nil
 }
 
-func getConfigManager(rp viper.RemoteProvider) (interface{}, error) {
+func (rc *remoteConfigProvider) getConfigManager(rp viper.RemoteProvider) (interface{}, error) {
 	if rp.Provider() == "nacos" {
-		return NewNacosConfigManager(nacosOptions)
+		return rc.ConfigManager, nil
 	} else {
 		return nil, errors.New("The Nacos configuration manager is not supported!")
 	}
 }
-
-func init() {
-	viper.SupportedRemoteProviders = []string{"nacos"}
-	viper.RemoteConfig = &remoteConfigProvider{}
-}