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watcher.go
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watcher.go
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package nacos
import (
"errors"
"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"
"github.com/yoyofx/yoyogo/abstractions/servicediscovery"
"github.com/yoyofx/yoyogo/abstractions/xlog"
"reflect"
"strconv"
"sync"
)
type Watcher struct {
serviceName string
namingClient naming_client.INamingClient
done chan bool
results chan *servicediscovery.Result
cacheLock sync.Mutex
instanceMap map[string]model.Instance //Instance map of host for key
subscribeParam *vo.SubscribeParam
logger xlog.ILogger
serviceConfig *Config
}
func newWatcher(client naming_client.INamingClient, config *Config, log xlog.ILogger, opts ...servicediscovery.WatchOption) (servicediscovery.Watcher, error) {
var wo servicediscovery.WatchOptions
for _, o := range opts {
o(&wo)
}
w := &Watcher{
serviceName: wo.Service,
namingClient: client,
logger: log,
done: make(chan bool),
results: make(chan *servicediscovery.Result),
instanceMap: map[string]model.Instance{},
serviceConfig: config,
}
err := w.start()
return w, err
}
func (w *Watcher) Next() (*servicediscovery.Result, error) {
for {
select {
case <-w.done:
w.logger.Warning("nacos listener is close!")
return nil, errors.New("listener stopped")
case e := <-w.results:
id := e.Service.Name
if len(e.Service.Nodes) > 0 {
id = e.Service.Nodes[0].GetId()
}
w.logger.Debug("got nacos %s event by servicename: %s", e.Action, id)
return e, nil
}
}
}
func (w *Watcher) Stop() {
_ = w.namingClient.Unsubscribe(w.subscribeParam)
close(w.done)
}
func (w *Watcher) start() error {
if w.namingClient == nil {
return errors.New("nacos naming client is nil")
}
w.subscribeParam = &vo.SubscribeParam{ServiceName: w.serviceName, GroupName: w.serviceConfig.GroupName, Clusters: []string{w.serviceConfig.Cluster}, SubscribeCallback: w.callback}
go func() {
_ = w.namingClient.Subscribe(w.subscribeParam)
}()
return nil
}
// Callback will be invoked when got subscribed events.
func (w *Watcher) callback(services []model.SubscribeService, err error) {
if err != nil {
w.logger.Error("nacos subscribe callback error:%s , subscribe:%+v ", err.Error(), w.subscribeParam)
return
}
w.cacheLock.Lock()
defer w.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))
//add and update cache
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 := w.instanceMap[host]; !ok {
// instance does not exist 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)
}
}
}
//del cache
for host, inst := range w.instanceMap {
if _, ok := newInstanceMap[host]; !ok {
// cache instance does not exist in new instance list, remove it from cache
delInstances = append(delInstances, inst)
}
}
w.instanceMap = newInstanceMap
for i := range addInstances {
w.results <- &servicediscovery.Result{
Action: "create", Service: &servicediscovery.Service{
Name: w.serviceName,
Nodes: []servicediscovery.ServiceInstance{toServiceInstance(addInstances[i])},
},
}
}
for i := range delInstances {
w.results <- &servicediscovery.Result{
Action: "delete", Service: &servicediscovery.Service{
Name: w.serviceName,
Nodes: []servicediscovery.ServiceInstance{toServiceInstance(delInstances[i])},
},
}
}
for i := range updateInstances {
w.results <- &servicediscovery.Result{
Action: "update", Service: &servicediscovery.Service{
Name: w.serviceName,
Nodes: []servicediscovery.ServiceInstance{toServiceInstance(updateInstances[i])},
},
}
}
}
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 toServiceInstance(s model.Instance) *servicediscovery.DefaultServiceInstance {
instance := &servicediscovery.DefaultServiceInstance{
Id: s.InstanceId,
ServiceName: s.ServiceName,
Host: s.Ip,
Port: s.Port,
ClusterName: s.ClusterName,
Enable: true,
Weight: s.Weight,
Healthy: s.Healthy,
Metadata: s.Metadata,
}
return instance
}