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100 lines
2.3 KiB
100 lines
2.3 KiB
// Copyright 2016 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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package oracles
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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/store/tikv/oracle"
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)
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var _ oracle.Oracle = &localOracle{}
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type localOracle struct {
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sync.Mutex
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lastTimeStampTS uint64
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n uint64
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hook *struct {
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currentTime time.Time
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}
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}
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// NewLocalOracle creates an Oracle that uses local time as data source.
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func NewLocalOracle() oracle.Oracle {
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return &localOracle{}
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}
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func (l *localOracle) IsExpired(lockTS uint64, TTL uint64) bool {
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now := time.Now()
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if l.hook != nil {
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now = l.hook.currentTime
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}
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return oracle.GetPhysical(now) >= oracle.ExtractPhysical(lockTS)+int64(TTL)
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}
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func (l *localOracle) GetTimestamp(context.Context) (uint64, error) {
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l.Lock()
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defer l.Unlock()
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now := time.Now()
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if l.hook != nil {
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now = l.hook.currentTime
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}
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physical := oracle.GetPhysical(now)
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ts := oracle.ComposeTS(physical, 0)
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if l.lastTimeStampTS == ts {
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l.n++
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return ts + l.n, nil
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}
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l.lastTimeStampTS = ts
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l.n = 0
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return ts, nil
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}
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func (l *localOracle) GetTimestampAsync(ctx context.Context) oracle.Future {
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return &future{
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ctx: ctx,
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l: l,
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}
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}
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func (l *localOracle) GetLowResolutionTimestamp(ctx context.Context) (uint64, error) {
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return l.GetTimestamp(ctx)
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}
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func (l *localOracle) GetLowResolutionTimestampAsync(ctx context.Context) oracle.Future {
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return l.GetTimestampAsync(ctx)
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}
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type future struct {
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ctx context.Context
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l *localOracle
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}
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func (f *future) Wait() (uint64, error) {
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return f.l.GetTimestamp(f.ctx)
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}
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// UntilExpired implement oracle.Oracle interface.
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func (l *localOracle) UntilExpired(lockTimeStamp uint64, TTL uint64) int64 {
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now := time.Now()
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if l.hook != nil {
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now = l.hook.currentTime
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}
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return oracle.ExtractPhysical(lockTimeStamp) + int64(TTL) - oracle.GetPhysical(now)
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}
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func (l *localOracle) Close() {
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}
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