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*: separate resolvedTs event from txnEvent (#231)
* common: add TEvent Signed-off-by: dongmen <[email protected]> * common: add resolvedTs event Signed-off-by: dongmen <[email protected]> * common: unit test cases Signed-off-by: dongmen <[email protected]> * fix panic Signed-off-by: dongmen <[email protected]> * revert dispatcher metrics changes Signed-off-by: dongmen <[email protected]> --------- Signed-off-by: dongmen <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,180 @@ | ||
| // Copyright 2020 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package common | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "fmt" | ||
| "log" | ||
|
|
||
| "github.com/pingcap/tidb/pkg/parser/model" | ||
| "github.com/pingcap/tidb/pkg/util/chunk" | ||
| ) | ||
|
|
||
| const ( | ||
| // TEvent is the event type of a transaction. | ||
| TypeTEvent = iota | ||
| // DDLEvent is the event type of a DDL. | ||
| TypeDDLEvent | ||
| // ResolvedEvent is the event type of a resolvedTs. | ||
| TypeResolvedEvent | ||
| // BatchResolvedTs is the event type of a batch resolvedTs. | ||
| TypeBatchResolvedTs | ||
| TypeTxnEvent | ||
| ) | ||
|
|
||
| type Event interface { | ||
| GetType() int | ||
| GetDispatcherID() DispatcherID | ||
| } | ||
|
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| type BatchResolvedTs struct { | ||
| Events []ResolvedEvent | ||
| } | ||
|
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| func (b BatchResolvedTs) GetType() int { | ||
| return TypeBatchResolvedTs | ||
| } | ||
|
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| func (b BatchResolvedTs) GetDispatcherID() DispatcherID { | ||
| // It's a fake dispatcherID. | ||
| return NewDispatcherID() | ||
| } | ||
|
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| func (b *BatchResolvedTs) Marshal() ([]byte, error) { | ||
| buf := make([]byte, 0, len(b.Events)*24) | ||
| for _, e := range b.Events { | ||
| data, err := e.Marshal() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| buf = append(buf, data...) | ||
| } | ||
| return buf, nil | ||
| } | ||
|
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| func (b *BatchResolvedTs) Unmarshal(data []byte) error { | ||
| if len(data)%24 != 0 { | ||
| log.Panic("BatchResolvedTs.Unmarshal: invalid data") | ||
| } | ||
| b.Events = make([]ResolvedEvent, 0, len(data)/24) | ||
| for i := 0; i < len(data); i += 24 { | ||
| var e ResolvedEvent | ||
| if err := e.Unmarshal(data[i : i+24]); err != nil { | ||
| return err | ||
| } | ||
| b.Events = append(b.Events, e) | ||
| } | ||
| return nil | ||
| } | ||
|
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| // ResolvedEvent represents a resolvedTs event of a dispatcher. | ||
| type ResolvedEvent struct { | ||
| DispatcherID DispatcherID | ||
| ResolvedTs Ts | ||
| } | ||
|
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| func (e ResolvedEvent) GetType() int { | ||
| return TypeResolvedEvent | ||
| } | ||
|
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| func (e ResolvedEvent) GetDispatcherID() DispatcherID { | ||
| return e.DispatcherID | ||
| } | ||
|
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| func (e ResolvedEvent) Marshal() ([]byte, error) { | ||
| buf := e.DispatcherID.Marshal() | ||
| buf = append(buf, make([]byte, 8)...) | ||
| binary.LittleEndian.PutUint64(buf[16:24], e.ResolvedTs) | ||
| return buf, nil | ||
| } | ||
|
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| func (e *ResolvedEvent) Unmarshal(data []byte) error { | ||
| if len(data) != 24 { | ||
| log.Panic("ResolvedEvent.Unmarshal: invalid data") | ||
| } | ||
| e.DispatcherID.Unmarshal(data[:16]) | ||
| e.ResolvedTs = Ts(binary.LittleEndian.Uint64(data[16:24])) | ||
| return nil | ||
| } | ||
|
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| func (e ResolvedEvent) String() string { | ||
| return fmt.Sprintf("ResolvedEvent{DispatcherID: %s, ResolvedTs: %d}", e.DispatcherID, e.ResolvedTs) | ||
| } | ||
|
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| // TEvent represent a transaction, it contains the rows of the transaction. | ||
| // Note: The PreRows is the rows before the transaction, it is used to generate the update and delete SQL. | ||
| // The Rows is the rows after the transaction, it is used to generate the insert and update SQL. | ||
| type TEvent struct { | ||
| DispatcherID DispatcherID | ||
| PhysicalTableID uint64 | ||
| StartTs uint64 | ||
| CommitTs uint64 | ||
|
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| Rows chunk.Chunk | ||
| PreRows chunk.Chunk | ||
| } | ||
|
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| func (t TEvent) GetType() int { | ||
| return TypeTEvent | ||
| } | ||
|
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| func (t TEvent) GetDispatcherID() DispatcherID { | ||
| return t.DispatcherID | ||
| } | ||
|
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| func (t TEvent) Marshal() ([]byte, error) { | ||
| // TODO | ||
| log.Panic("TEvent.Marshal: not implemented") | ||
| buf := make([]byte, 0) | ||
| return buf, nil | ||
| } | ||
|
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| func (t TEvent) Unmarshal(data []byte) error { | ||
| //TODO | ||
| log.Panic("TEvent.Unmarshal: not implemented") | ||
| return nil | ||
| } | ||
|
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| type DDLEventX struct { | ||
| DispatcherID DispatcherID | ||
| // commitTS of the rawKV | ||
| CommitTS Ts | ||
| Job *model.Job | ||
| } | ||
|
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| func (d DDLEventX) GetType() int { | ||
| return TypeDDLEvent | ||
| } | ||
|
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| func (d DDLEventX) GetDispatcherID() DispatcherID { | ||
| return d.DispatcherID | ||
| } | ||
|
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| func (d DDLEventX) Marshal() ([]byte, error) { | ||
| // TODO | ||
| log.Panic("DDLEvent.Marshal: not implemented") | ||
| buf := make([]byte, 0) | ||
| return buf, nil | ||
| } | ||
|
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| func (d DDLEventX) Unmarshal(data []byte) error { | ||
| //TODO | ||
| log.Panic("DDLEvent.Unmarshal: not implemented") | ||
| return nil | ||
| } | ||
|
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| func (d DDLEventX) String() string { | ||
| return fmt.Sprintf("DDLEvent{DispatcherID: %s, CommitTS: %d, Job: %v}", d.DispatcherID, d.CommitTS, d.Job) | ||
| } |
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