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implement the external timestamp client
Signed-off-by: YangKeao <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| // Copyright 2022 TiKV Authors | ||
| // | ||
| // 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 oracles | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync/atomic" | ||
|
|
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| "github.com/pkg/errors" | ||
| "github.com/tikv/client-go/v2/oracle" | ||
| ) | ||
|
|
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| type localExternalTimestamp struct { | ||
| externalTimestamp atomic.Uint64 | ||
| } | ||
|
|
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| func (l *localExternalTimestamp) setExternalTimestamp(ctx context.Context, o oracle.Oracle, newTimestamp uint64) error { | ||
| currentTSO, err := o.GetTimestamp(ctx, nil) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if newTimestamp > currentTSO { | ||
| return errors.New("external timestamp is greater than global tso") | ||
| } | ||
| for { | ||
| externalTimestamp := l.externalTimestamp.Load() | ||
| if externalTimestamp > newTimestamp { | ||
| return errors.New("cannot decrease the external timestamp") | ||
| } | ||
|
|
||
| if l.externalTimestamp.CompareAndSwap(externalTimestamp, newTimestamp) { | ||
| return nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (l *localExternalTimestamp) getExternalTimestamp(ctx context.Context) (uint64, error) { | ||
| return l.externalTimestamp.Load(), nil | ||
| } |
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