tidb backoff 源码
tidb backoff 代码
文件路径：/store/driver/backoff/backoff.go
// Copyright 2021 PingCAP, Inc.
//
// 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 backoff
import (
"context"
"github.com/pingcap/tidb/kv"
derr "github.com/pingcap/tidb/store/driver/error"
"github.com/tikv/client-go/v2/tikv"
)
// Backoffer wraps tikv.Backoffer and converts the error which returns by the functions of tikv.Backoffer to tidb error.
type Backoffer struct {
b *tikv.Backoffer
}
// NewBackofferWithVars creates a Backoffer with maximum sleep time(in ms) and kv.Variables.
func NewBackofferWithVars(ctx context.Context, maxSleep int, vars *kv.Variables) *Backoffer {
b := tikv.NewBackofferWithVars(ctx, maxSleep, vars)
return &Backoffer{b: b}
}
// NewBackoffer creates a Backoffer with maximum sleep time(in ms).
func NewBackoffer(ctx context.Context, maxSleep int) *Backoffer {
b := tikv.NewBackoffer(ctx, maxSleep)
return &Backoffer{b: b}
}
// TiKVBackoffer returns tikv.Backoffer.
func (b *Backoffer) TiKVBackoffer() *tikv.Backoffer {
return b.b
}
// Backoff sleeps a while base on the BackoffConfig and records the error message.
// It returns a retryable error if total sleep time exceeds maxSleep.
func (b *Backoffer) Backoff(cfg *tikv.BackoffConfig, err error) error {
e := b.b.Backoff(cfg, err)
return derr.ToTiDBErr(e)
}
// BackoffWithMaxSleepTxnLockFast sleeps a while for the operation TxnLockFast and records the error message
// and never sleep more than maxSleepMs for each sleep.
func (b *Backoffer) BackoffWithMaxSleepTxnLockFast(maxSleepMs int, err error) error {
e := b.b.BackoffWithMaxSleepTxnLockFast(maxSleepMs, err)
return derr.ToTiDBErr(e)
}
// GetBackoffTimes returns a map contains backoff time count by type.
func (b *Backoffer) GetBackoffTimes() map[string]int {
return b.b.GetBackoffTimes()
}
// GetCtx returns the binded context.
func (b *Backoffer) GetCtx() context.Context {
return b.b.GetCtx()
}
// GetVars returns the binded vars.
func (b *Backoffer) GetVars() *tikv.Variables {
return b.b.GetVars()
}
// GetBackoffSleepMS returns a map contains backoff sleep time by type.
func (b *Backoffer) GetBackoffSleepMS() map[string]int {
return b.b.GetBackoffSleepMS()
}
// GetTotalSleep returns total sleep time.
func (b *Backoffer) GetTotalSleep() int {
return b.b.GetTotalSleep()
}
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