81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// Copyright 2024 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"context"
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"sync"
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"time"
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"github.com/pingcap/tidb/pkg/ddl/logutil"
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"github.com/pingcap/tidb/pkg/metrics"
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clientv3 "go.etcd.io/etcd/client/v3"
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)
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// Watcher is responsible for watching the etcd path related operations.
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type Watcher interface {
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// WatchChan returns the chan for watching etcd path.
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WatchChan() clientv3.WatchChan
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// Watch watches the etcd path.
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Watch(ctx context.Context, etcdCli *clientv3.Client, path string)
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// Rewatch rewatches the etcd path.
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Rewatch(ctx context.Context, etcdCli *clientv3.Client, path string)
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}
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type watcher struct {
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wCh clientv3.WatchChan
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sync.RWMutex
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}
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// NewWatcher creates a new watcher.
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func NewWatcher() Watcher {
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return &watcher{}
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}
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// WatchChan implements SyncerWatch.WatchChan interface.
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func (w *watcher) WatchChan() clientv3.WatchChan {
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w.RLock()
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defer w.RUnlock()
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return w.wCh
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}
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// Watch implements SyncerWatch.Watch interface.
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func (w *watcher) Watch(ctx context.Context, etcdCli *clientv3.Client, path string) {
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w.Lock()
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w.wCh = etcdCli.Watch(ctx, path)
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w.Unlock()
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}
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// Rewatch implements SyncerWatch.Rewatch interface.
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func (w *watcher) Rewatch(ctx context.Context, etcdCli *clientv3.Client, path string) {
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startTime := time.Now()
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// Make sure the wCh doesn't receive the information of 'close' before we finish the rewatch.
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w.Lock()
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w.wCh = nil
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w.Unlock()
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go func() {
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defer func() {
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metrics.DeploySyncerHistogram.WithLabelValues(metrics.SyncerRewatch, metrics.RetLabel(nil)).Observe(time.Since(startTime).Seconds())
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}()
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wCh := etcdCli.Watch(ctx, path)
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w.Lock()
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w.wCh = wCh
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w.Unlock()
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logutil.DDLLogger().Info("syncer rewatch global info finished")
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}()
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}
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