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listener.go
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listener.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package nacos
import (
"bytes"
"net/url"
"reflect"
"strconv"
"sync"
)
import (
gxchan "github.com/dubbogo/gost/container/chan"
nacosClient "github.com/dubbogo/gost/database/kv/nacos"
"github.com/nacos-group/nacos-sdk-go/model"
"github.com/nacos-group/nacos-sdk-go/vo"
perrors "github.com/pkg/errors"
)
import (
"dubbo.apache.org/dubbo-go/v3/common"
"dubbo.apache.org/dubbo-go/v3/common/constant"
"dubbo.apache.org/dubbo-go/v3/common/logger"
"dubbo.apache.org/dubbo-go/v3/config_center"
"dubbo.apache.org/dubbo-go/v3/registry"
"dubbo.apache.org/dubbo-go/v3/remoting"
)
var (
listenerCache sync.Map
)
type callback func(services []model.SubscribeService, err error)
type nacosListener struct {
namingClient *nacosClient.NacosNamingClient
listenURL *common.URL
regURL *common.URL
events *gxchan.UnboundedChan
instanceMap map[string]model.Instance
cacheLock sync.Mutex
done chan struct{}
subscribeParam *vo.SubscribeParam
}
// NewNacosListener creates a data listener for nacos
func NewNacosListener(url, regURL *common.URL, namingClient *nacosClient.NacosNamingClient) (*nacosListener, error) {
listener := &nacosListener{
namingClient: namingClient,
listenURL: url,
regURL: regURL,
events: gxchan.NewUnboundedChan(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,
Healthy: ss.Healthy,
}
}
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),
)
}
// Callback will be invoked when got subscribed events.
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
}
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))
nl.cacheLock.Lock()
defer nl.cacheLock.Unlock()
for i := range services {
if !services[i].Enable {
// 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.Healthy {
// instance does not exist in cache, add it to cache
addInstances = append(addInstances, instance)
} else if !reflect.DeepEqual(old, instance) && instance.Healthy {
// instance is not different from cache, update it to cache
updateInstances = append(updateInstances, instance)
}
}
for host, inst := range nl.instanceMap {
if newInstance, ok := newInstanceMap[host]; !ok || !newInstance.Healthy {
// cache instance does not exist in new instance list, remove it from cache
delInstances = append(delInstances, inst)
}
}
nl.instanceMap = newInstanceMap
for i := range addInstances {
if newUrl := generateUrl(addInstances[i]); newUrl != nil {
nl.process(&config_center.ConfigChangeEvent{Value: newUrl, ConfigType: remoting.EventTypeAdd})
}
}
for i := range delInstances {
if newUrl := generateUrl(delInstances[i]); newUrl != nil {
nl.process(&config_center.ConfigChangeEvent{Value: newUrl, ConfigType: remoting.EventTypeDel})
}
}
for i := range updateInstances {
if newUrl := generateUrl(updateInstances[i]); newUrl != nil {
nl.process(&config_center.ConfigChangeEvent{Value: newUrl, ConfigType: remoting.EventTypeUpdate})
}
}
}
func getSubscribeName(url *common.URL) string {
var buffer bytes.Buffer
buffer.Write([]byte(common.DubboNodes[common.PROVIDER]))
appendParam(&buffer, url, constant.InterfaceKey)
appendParam(&buffer, url, constant.VersionKey)
appendParam(&buffer, url, constant.GroupKey)
return buffer.String()
}
func (nl *nacosListener) startListen() error {
if nl.namingClient == nil {
return perrors.New("nacos naming namingClient stopped")
}
nl.subscribeParam = createSubscribeParam(nl.listenURL, nl.regURL, nl.Callback)
if nl.subscribeParam == nil {
return perrors.New("create nacos subscribeParam failed")
}
go func() {
err := nl.namingClient.Client().Subscribe(nl.subscribeParam)
if err == nil {
listenerCache.Store(nl.subscribeParam.ServiceName+nl.subscribeParam.GroupName, nl)
}
}()
return nil
}
func (nl *nacosListener) stopListen() error {
return nl.namingClient.Client().Unsubscribe(nl.subscribeParam)
}
func (nl *nacosListener) process(configType *config_center.ConfigChangeEvent) {
nl.events.In() <- configType
}
// Next returns the service event from nacos.
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 val := <-nl.events.Out():
e, _ := val.(*config_center.ConfigChangeEvent)
logger.Debugf("got nacos event %s", e)
return ®istry.ServiceEvent{Action: e.ConfigType, Service: e.Value.(*common.URL)}, nil
}
}
}
// nolint
func (nl *nacosListener) Close() {
_ = nl.stopListen()
close(nl.done)
}