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80 lines
2.4 KiB
80 lines
2.4 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 oracle
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import (
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"context"
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"time"
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"github.com/pingcap/failpoint"
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"github.com/pingcap/tidb/util/logutil"
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"go.uber.org/zap"
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)
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// Oracle is the interface that provides strictly ascending timestamps.
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type Oracle interface {
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GetTimestamp(ctx context.Context) (uint64, error)
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GetTimestampAsync(ctx context.Context) Future
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GetLowResolutionTimestamp(ctx context.Context) (uint64, error)
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GetLowResolutionTimestampAsync(ctx context.Context) Future
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IsExpired(lockTimestamp uint64, TTL uint64) bool
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UntilExpired(lockTimeStamp uint64, TTL uint64) int64
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Close()
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}
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// Future is a future which promises to return a timestamp.
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type Future interface {
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Wait() (uint64, error)
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}
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const physicalShiftBits = 18
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// ComposeTS creates a ts from physical and logical parts.
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func ComposeTS(physical, logical int64) uint64 {
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failpoint.Inject("changeTSFromPD", func(val failpoint.Value) {
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valInt, ok := val.(int)
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if ok {
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origPhyTS := physical
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logical := logical
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newPhyTs := origPhyTS + int64(valInt)
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origTS := uint64((physical << physicalShiftBits) + logical)
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newTS := uint64((newPhyTs << physicalShiftBits) + logical)
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logutil.BgLogger().Warn("ComposeTS failpoint", zap.Uint64("origTS", origTS),
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zap.Int("valInt", valInt), zap.Uint64("ts", newTS))
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failpoint.Return(newTS)
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}
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})
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return uint64((physical << physicalShiftBits) + logical)
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}
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// ExtractPhysical returns a ts's physical part.
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func ExtractPhysical(ts uint64) int64 {
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return int64(ts >> physicalShiftBits)
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}
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// GetPhysical returns physical from an instant time with millisecond precision.
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func GetPhysical(t time.Time) int64 {
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return t.UnixNano() / int64(time.Millisecond)
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}
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// EncodeTSO encodes a millisecond into tso.
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func EncodeTSO(ts int64) uint64 {
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return uint64(ts) << physicalShiftBits
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}
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// GetTimeFromTS extracts time.Time from a timestamp.
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func GetTimeFromTS(ts uint64) time.Time {
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ms := ExtractPhysical(ts)
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return time.Unix(ms/1e3, (ms%1e3)*1e6)
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}
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