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etcdv3.go
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etcdv3.go
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// Copyright 2020 Douyu
//
// 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 etcdv3
import (
"context"
"time"
"github.com/douyu/jupiter/pkg/client/etcdv3"
"github.com/douyu/jupiter/pkg/conf"
"github.com/douyu/jupiter/pkg/util/xgo"
"github.com/pkg/errors"
"go.etcd.io/etcd/api/v3/mvccpb"
clientv3 "go.etcd.io/etcd/client/v3"
)
type etcdv3DataSource struct {
propertyKey string
lastUpdatedRevision int64
client *etcdv3.Client
// cancel is the func, call cancel will stop watching on the propertyKey
cancel context.CancelFunc
// closed indicate whether continuing to watch on the propertyKey
// closed util.AtomicBool
// logger *xlog.Logger
changed chan struct{}
}
// NewDataSource new a etcdv3DataSource instance.
// client is the etcdv3 client, it must be useful and should be release by User.
func NewDataSource(client *etcdv3.Client, key string) conf.DataSource {
ds := &etcdv3DataSource{
client: client,
propertyKey: key,
}
xgo.Go(ds.watch)
return ds
}
// ReadConfig ...
func (s *etcdv3DataSource) ReadConfig() ([]byte, error) {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
resp, err := s.client.Get(ctx, s.propertyKey)
if err != nil {
return nil, err
}
if resp.Count == 0 {
return nil, errors.New("empty response")
}
s.lastUpdatedRevision = resp.Header.GetRevision()
return resp.Kvs[0].Value, nil
}
// IsConfigChanged ...
func (s *etcdv3DataSource) IsConfigChanged() <-chan struct{} {
return s.changed
}
func (s *etcdv3DataSource) handle(resp *clientv3.WatchResponse) {
if resp.CompactRevision > s.lastUpdatedRevision {
s.lastUpdatedRevision = resp.CompactRevision
}
if resp.Header.GetRevision() > s.lastUpdatedRevision {
s.lastUpdatedRevision = resp.Header.GetRevision()
}
if err := resp.Err(); err != nil {
return
}
for _, ev := range resp.Events {
if ev.Type == mvccpb.PUT || ev.Type == mvccpb.DELETE {
select {
case s.changed <- struct{}{}:
default:
}
}
}
}
func (s *etcdv3DataSource) watch() {
ctx, cancel := context.WithCancel(context.Background())
s.cancel = cancel
rch := s.client.Watch(ctx, s.propertyKey, clientv3.WithCreatedNotify(), clientv3.WithRev(s.lastUpdatedRevision))
for {
for resp := range rch {
s.handle(&resp)
}
time.Sleep(time.Second)
ctx, cancel = context.WithCancel(context.Background())
if s.lastUpdatedRevision > 0 {
rch = s.client.Watch(ctx, s.propertyKey, clientv3.WithCreatedNotify(), clientv3.WithRev(s.lastUpdatedRevision))
} else {
rch = s.client.Watch(ctx, s.propertyKey, clientv3.WithCreatedNotify())
}
s.cancel = cancel
}
}
// Close ...
func (s *etcdv3DataSource) Close() error {
s.cancel()
return nil
}