61 lines
2.1 KiB
Go
61 lines
2.1 KiB
Go
// Copyright 2018 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 etcd
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import (
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"context"
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"time"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/pkg/metrics"
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"github.com/pingcap/tidb/pkg/util/logutil"
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clientv3 "go.etcd.io/etcd/client/v3"
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"go.etcd.io/etcd/client/v3/namespace"
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"go.uber.org/zap"
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)
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const (
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// KeyOpDefaultTimeout is the default timeout for each key operation.
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KeyOpDefaultTimeout = 2 * time.Second
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// KeyOpDefaultRetryCnt is the default retry times for each key operation.
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KeyOpDefaultRetryCnt = 5
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// KeyOpRetryInterval is the interval between two key operations.
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KeyOpRetryInterval = 30 * time.Millisecond
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)
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// SetEtcdCliByNamespace is used to add an etcd namespace prefix before etcd path.
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func SetEtcdCliByNamespace(cli *clientv3.Client, namespacePrefix string) {
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cli.KV = namespace.NewKV(cli.KV, namespacePrefix)
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cli.Watcher = namespace.NewWatcher(cli.Watcher, namespacePrefix)
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cli.Lease = namespace.NewLease(cli.Lease, namespacePrefix)
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}
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// DeleteKeyFromEtcd deletes key value from etcd.
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func DeleteKeyFromEtcd(key string, etcdCli *clientv3.Client, retryCnt int, timeout time.Duration) error {
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var err error
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ctx := context.Background()
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for i := range retryCnt {
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childCtx, cancel := context.WithTimeout(ctx, timeout)
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_, err = etcdCli.Delete(childCtx, key)
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cancel()
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if err == nil {
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return nil
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}
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metrics.RetryableErrorCount.WithLabelValues(err.Error()).Inc()
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logutil.BgLogger().Warn("etcd-cli delete key failed", zap.String("key", key), zap.Error(err), zap.Int("retryCnt", i))
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}
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return errors.Trace(err)
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}
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