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116 lines
2.8 KiB
116 lines
2.8 KiB
// 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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mockoracle
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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/errors"
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"github.com/pingcap/tidb/store/tikv/oracle"
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)
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var errStopped = errors.New("stopped")
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// MockOracle is a mock oracle for test.
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type MockOracle struct {
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sync.RWMutex
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stop bool
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offset time.Duration
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lastTS uint64
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}
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// Enable enables the Oracle
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func (o *MockOracle) Enable() {
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o.Lock()
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defer o.Unlock()
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o.stop = false
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}
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// Disable disables the Oracle
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func (o *MockOracle) Disable() {
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o.Lock()
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defer o.Unlock()
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o.stop = true
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}
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// AddOffset adds the offset of the oracle.
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func (o *MockOracle) AddOffset(d time.Duration) {
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o.Lock()
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defer o.Unlock()
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o.offset += d
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}
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// GetTimestamp implements oracle.Oracle interface.
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func (o *MockOracle) GetTimestamp(context.Context) (uint64, error) {
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o.Lock()
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defer o.Unlock()
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if o.stop {
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return 0, errors.Trace(errStopped)
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}
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physical := oracle.GetPhysical(time.Now().Add(o.offset))
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ts := oracle.ComposeTS(physical, 0)
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if oracle.ExtractPhysical(o.lastTS) == physical {
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ts = o.lastTS + 1
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}
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o.lastTS = ts
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return ts, nil
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}
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type mockOracleFuture struct {
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o *MockOracle
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ctx context.Context
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}
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func (m *mockOracleFuture) Wait() (uint64, error) {
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return m.o.GetTimestamp(m.ctx)
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}
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// GetTimestampAsync implements oracle.Oracle interface.
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func (o *MockOracle) GetTimestampAsync(ctx context.Context) oracle.Future {
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return &mockOracleFuture{o, ctx}
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}
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// GetLowResolutionTimestamp implements oracle.Oracle interface.
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func (o *MockOracle) GetLowResolutionTimestamp(ctx context.Context) (uint64, error) {
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return o.GetTimestamp(ctx)
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}
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// GetLowResolutionTimestampAsync implements oracle.Oracle interface.
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func (o *MockOracle) GetLowResolutionTimestampAsync(ctx context.Context) oracle.Future {
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return o.GetTimestampAsync(ctx)
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}
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// IsExpired implements oracle.Oracle interface.
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func (o *MockOracle) IsExpired(lockTimestamp uint64, TTL uint64) bool {
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o.RLock()
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defer o.RUnlock()
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return oracle.GetPhysical(time.Now().Add(o.offset)) >= oracle.ExtractPhysical(lockTimestamp)+int64(TTL)
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}
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// UntilExpired implement oracle.Oracle interface.
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func (o *MockOracle) UntilExpired(lockTimeStamp uint64, TTL uint64) int64 {
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o.RLock()
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defer o.RUnlock()
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return oracle.ExtractPhysical(lockTimeStamp) + int64(TTL) - oracle.GetPhysical(time.Now().Add(o.offset))
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}
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// Close implements oracle.Oracle interface.
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func (o *MockOracle) Close() {
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}
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