100 lines
1.9 KiB
Go
100 lines
1.9 KiB
Go
package etcd
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"time"
|
|
|
|
"github.com/coreos/etcd/clientv3"
|
|
"github.com/micro/go-micro/v3/registry"
|
|
)
|
|
|
|
type etcdWatcher struct {
|
|
stop chan bool
|
|
w clientv3.WatchChan
|
|
client *clientv3.Client
|
|
timeout time.Duration
|
|
}
|
|
|
|
func newEtcdWatcher(r *etcdRegistry, timeout time.Duration, opts ...registry.WatchOption) (registry.Watcher, error) {
|
|
var wo registry.WatchOptions
|
|
for _, o := range opts {
|
|
o(&wo)
|
|
}
|
|
if len(wo.Domain) == 0 {
|
|
wo.Domain = defaultDomain
|
|
}
|
|
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
stop := make(chan bool, 1)
|
|
|
|
go func() {
|
|
<-stop
|
|
cancel()
|
|
}()
|
|
|
|
watchPath := prefix
|
|
if wo.Domain == registry.WildcardDomain {
|
|
if len(wo.Service) > 0 {
|
|
return nil, errors.New("Cannot watch a service across domains")
|
|
}
|
|
watchPath = prefix
|
|
} else if len(wo.Service) > 0 {
|
|
watchPath = servicePath(wo.Domain, wo.Service) + "/"
|
|
}
|
|
|
|
return &etcdWatcher{
|
|
stop: stop,
|
|
w: r.client.Watch(ctx, watchPath, clientv3.WithPrefix(), clientv3.WithPrevKV()),
|
|
client: r.client,
|
|
timeout: timeout,
|
|
}, nil
|
|
}
|
|
|
|
func (ew *etcdWatcher) Next() (*registry.Result, error) {
|
|
for wresp := range ew.w {
|
|
if wresp.Err() != nil {
|
|
return nil, wresp.Err()
|
|
}
|
|
if wresp.Canceled {
|
|
return nil, errors.New("could not get next")
|
|
}
|
|
for _, ev := range wresp.Events {
|
|
service := decode(ev.Kv.Value)
|
|
var action string
|
|
|
|
switch ev.Type {
|
|
case clientv3.EventTypePut:
|
|
if ev.IsCreate() {
|
|
action = "create"
|
|
} else if ev.IsModify() {
|
|
action = "update"
|
|
}
|
|
case clientv3.EventTypeDelete:
|
|
action = "delete"
|
|
|
|
// get service from prevKv
|
|
service = decode(ev.PrevKv.Value)
|
|
}
|
|
|
|
if service == nil {
|
|
continue
|
|
}
|
|
return ®istry.Result{
|
|
Action: action,
|
|
Service: service,
|
|
}, nil
|
|
}
|
|
}
|
|
return nil, errors.New("could not get next")
|
|
}
|
|
|
|
func (ew *etcdWatcher) Stop() {
|
|
select {
|
|
case <-ew.stop:
|
|
return
|
|
default:
|
|
close(ew.stop)
|
|
}
|
|
}
|