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subscribe_callback.go
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subscribe_callback.go
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/*
* Copyright 1999-2020 Alibaba Group Holding Ltd.
*
* Licensed 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 naming_client
import (
"errors"
"github.com/easystack/nacos-sdk-go-v1x/clients/cache"
"github.com/easystack/nacos-sdk-go-v1x/common/logger"
"github.com/easystack/nacos-sdk-go-v1x/model"
"github.com/easystack/nacos-sdk-go-v1x/util"
)
type SubscribeCallback struct {
callbackFuncsMap cache.ConcurrentMap
}
func NewSubscribeCallback() SubscribeCallback {
ed := SubscribeCallback{}
ed.callbackFuncsMap = cache.NewConcurrentMap()
return ed
}
func (ed *SubscribeCallback) AddCallbackFuncs(serviceName string, clusters string, callbackFunc *func(services []model.SubscribeService, err error)) {
logger.Info("adding " + serviceName + " with " + clusters + " to listener map")
key := util.GetServiceCacheKey(serviceName, clusters)
var funcs []*func(services []model.SubscribeService, err error)
old, ok := ed.callbackFuncsMap.Get(key)
if ok {
funcs = append(funcs, old.([]*func(services []model.SubscribeService, err error))...)
}
funcs = append(funcs, callbackFunc)
ed.callbackFuncsMap.Set(key, funcs)
}
func (ed *SubscribeCallback) RemoveCallbackFuncs(serviceName string, clusters string, callbackFunc *func(services []model.SubscribeService, err error)) {
logger.Info("removing " + serviceName + " with " + clusters + " to listener map")
key := util.GetServiceCacheKey(serviceName, clusters)
funcs, ok := ed.callbackFuncsMap.Get(key)
if ok && funcs != nil {
var newFuncs []*func(services []model.SubscribeService, err error)
for _, funcItem := range funcs.([]*func(services []model.SubscribeService, err error)) {
if funcItem != callbackFunc {
newFuncs = append(newFuncs, funcItem)
}
}
ed.callbackFuncsMap.Set(key, newFuncs)
}
}
func (ed *SubscribeCallback) ServiceChanged(service *model.Service) {
if service == nil || service.Name == "" {
return
}
key := util.GetServiceCacheKey(service.Name, service.Clusters)
funcs, ok := ed.callbackFuncsMap.Get(key)
if ok {
for _, funcItem := range funcs.([]*func(services []model.SubscribeService, err error)) {
var subscribeServices []model.SubscribeService
if len(service.Hosts) == 0 {
(*funcItem)(subscribeServices, errors.New("[client.Subscribe] subscribe failed,hosts is empty"))
return
}
for _, host := range service.Hosts {
subscribeService := model.SubscribeService{
Valid: host.Valid,
Port: host.Port,
Ip: host.Ip,
Metadata: host.Metadata,
ServiceName: host.ServiceName,
ClusterName: host.ClusterName,
Weight: host.Weight,
InstanceId: host.InstanceId,
Enable: host.Enable,
Healthy: host.Healthy,
}
subscribeServices = append(subscribeServices, subscribeService)
}
(*funcItem)(subscribeServices, nil)
}
}
}