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This is an automated cherry-pick of pingcap#12038
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,228 @@ | ||
| // Copyright 2023 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 codec | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
|
|
||
| timodel "github.com/pingcap/tidb/pkg/meta/model" | ||
| "github.com/pingcap/tiflow/cdc/model" | ||
| codecv1 "github.com/pingcap/tiflow/cdc/model/codec/v1" | ||
| "github.com/tinylib/msgp/msgp" | ||
| ) | ||
|
|
||
| const ( | ||
| v1HeaderLength int = 4 | ||
| versionPrefixLength int = 2 | ||
| versionFieldLength int = 2 | ||
|
|
||
| latestVersion uint16 = 2 | ||
| ) | ||
|
|
||
| // NOTE: why we need this? | ||
| // | ||
| // Before this logic is introduced, redo log is encoded into byte slice without a version field. | ||
| // This makes it hard to extend in the future. | ||
| // However, in the old format (i.e. v1 format), the first 5 bytes are always same, which can be | ||
| // confirmed in v1/codec_gen.go. So we reuse those bytes, and add a version field in them. | ||
| var ( | ||
| versionPrefix = [versionPrefixLength]byte{0xff, 0xff} | ||
| ) | ||
|
|
||
| func postUnmarshal(r *model.RedoLog) { | ||
| workaroundColumn := func(c *model.Column, redoC *model.RedoColumn) { | ||
| c.Flag = model.ColumnFlagType(redoC.Flag) | ||
| if redoC.ValueIsEmptyBytes { | ||
| c.Value = []byte{} | ||
| } else { | ||
| c.Value = redoC.Value | ||
| } | ||
| } | ||
|
|
||
| if r.RedoRow.Row != nil { | ||
| row := r.RedoRow.Row | ||
| for i, c := range row.Columns { | ||
| if c != nil { | ||
| workaroundColumn(c, &r.RedoRow.Columns[i]) | ||
| } | ||
| } | ||
| for i, c := range row.PreColumns { | ||
| if c != nil { | ||
| workaroundColumn(c, &r.RedoRow.PreColumns[i]) | ||
| } | ||
| } | ||
| r.RedoRow.Columns = nil | ||
| r.RedoRow.PreColumns = nil | ||
| } | ||
| if r.RedoDDL.DDL != nil { | ||
| r.RedoDDL.DDL.Type = timodel.ActionType(r.RedoDDL.Type) | ||
| r.RedoDDL.DDL.TableInfo = &model.TableInfo{ | ||
| TableName: r.RedoDDL.TableName, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func preMarshal(r *model.RedoLog) { | ||
| // Workaround empty byte slice for msgp#247 | ||
| workaroundColumn := func(redoC *model.RedoColumn) { | ||
| switch v := redoC.Value.(type) { | ||
| case []byte: | ||
| if len(v) == 0 { | ||
| redoC.ValueIsEmptyBytes = true | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if r.RedoRow.Row != nil { | ||
| row := r.RedoRow.Row | ||
| r.RedoRow.Columns = make([]model.RedoColumn, 0, len(row.Columns)) | ||
| r.RedoRow.PreColumns = make([]model.RedoColumn, 0, len(row.PreColumns)) | ||
| for _, c := range row.Columns { | ||
| redoC := model.RedoColumn{} | ||
| if c != nil { | ||
| redoC.Value = c.Value | ||
| redoC.Flag = uint64(c.Flag) | ||
| workaroundColumn(&redoC) | ||
| } | ||
| r.RedoRow.Columns = append(r.RedoRow.Columns, redoC) | ||
| } | ||
| for _, c := range row.PreColumns { | ||
| redoC := model.RedoColumn{} | ||
| if c != nil { | ||
| redoC.Value = c.Value | ||
| redoC.Flag = uint64(c.Flag) | ||
| workaroundColumn(&redoC) | ||
| } | ||
| r.RedoRow.PreColumns = append(r.RedoRow.PreColumns, redoC) | ||
| } | ||
| } | ||
| if r.RedoDDL.DDL != nil { | ||
| r.RedoDDL.Type = byte(r.RedoDDL.DDL.Type) | ||
| if r.RedoDDL.DDL.TableInfo != nil { | ||
| r.RedoDDL.TableName = r.RedoDDL.DDL.TableInfo.TableName | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // UnmarshalRedoLog unmarshals a RedoLog from the given byte slice. | ||
| func UnmarshalRedoLog(bts []byte) (r *model.RedoLog, o []byte, err error) { | ||
| if len(bts) < versionPrefixLength { | ||
| err = msgp.ErrShortBytes | ||
| return | ||
| } | ||
|
|
||
| shouldBeV1 := false | ||
| for i := 0; i < versionPrefixLength; i++ { | ||
| if bts[i] != versionPrefix[i] { | ||
| shouldBeV1 = true | ||
| break | ||
| } | ||
| } | ||
| if shouldBeV1 { | ||
| var rv1 *codecv1.RedoLog = new(codecv1.RedoLog) | ||
| if o, err = rv1.UnmarshalMsg(bts); err != nil { | ||
| return | ||
| } | ||
| codecv1.PostUnmarshal(rv1) | ||
| r = redoLogFromV1(rv1) | ||
| } else { | ||
| bts = bts[versionPrefixLength:] | ||
| version, bts := decodeVersion(bts) | ||
| if version == latestVersion { | ||
| r = new(model.RedoLog) | ||
| if o, err = r.UnmarshalMsg(bts); err != nil { | ||
| return | ||
| } | ||
| postUnmarshal(r) | ||
| } else { | ||
| panic("unsupported codec version") | ||
| } | ||
| } | ||
| return | ||
| } | ||
|
|
||
| // MarshalRedoLog marshals a RedoLog into bytes. | ||
| func MarshalRedoLog(r *model.RedoLog, b []byte) (o []byte, err error) { | ||
| preMarshal(r) | ||
| b = append(b, versionPrefix[:]...) | ||
| b = binary.BigEndian.AppendUint16(b, latestVersion) | ||
| o, err = r.MarshalMsg(b) | ||
| return | ||
| } | ||
|
|
||
| // MarshalDDLAsRedoLog converts a DDLEvent into RedoLog, and then marshals it. | ||
| func MarshalDDLAsRedoLog(d *model.DDLEvent, b []byte) (o []byte, err error) { | ||
| log := &model.RedoLog{ | ||
| RedoDDL: model.RedoDDLEvent{DDL: d}, | ||
| Type: model.RedoLogTypeDDL, | ||
| } | ||
| return MarshalRedoLog(log, b) | ||
| } | ||
|
|
||
| func decodeVersion(bts []byte) (uint16, []byte) { | ||
| version := binary.BigEndian.Uint16(bts[0:versionFieldLength]) | ||
| return version, bts[versionFieldLength:] | ||
| } | ||
|
|
||
| func redoLogFromV1(rv1 *codecv1.RedoLog) (r *model.RedoLog) { | ||
| r = &model.RedoLog{Type: (model.RedoLogType)(rv1.Type)} | ||
| if rv1.RedoRow != nil && rv1.RedoRow.Row != nil { | ||
| r.RedoRow.Row = &model.RowChangedEventInRedoLog{ | ||
| StartTs: rv1.RedoRow.Row.StartTs, | ||
| CommitTs: rv1.RedoRow.Row.CommitTs, | ||
| Table: tableNameFromV1(rv1.RedoRow.Row.Table), | ||
| Columns: make([]*model.Column, 0, len(rv1.RedoRow.Row.Columns)), | ||
| PreColumns: make([]*model.Column, 0, len(rv1.RedoRow.Row.PreColumns)), | ||
| IndexColumns: rv1.RedoRow.Row.IndexColumns, | ||
| } | ||
| for _, c := range rv1.RedoRow.Row.Columns { | ||
| r.RedoRow.Row.Columns = append(r.RedoRow.Row.Columns, columnFromV1(c)) | ||
| } | ||
| for _, c := range rv1.RedoRow.Row.PreColumns { | ||
| r.RedoRow.Row.PreColumns = append(r.RedoRow.Row.PreColumns, columnFromV1(c)) | ||
| } | ||
| } | ||
| if rv1.RedoDDL != nil && rv1.RedoDDL.DDL != nil { | ||
| r.RedoDDL.DDL = &model.DDLEvent{ | ||
| StartTs: rv1.RedoDDL.DDL.StartTs, | ||
| CommitTs: rv1.RedoDDL.DDL.CommitTs, | ||
| Query: rv1.RedoDDL.DDL.Query, | ||
| TableInfo: rv1.RedoDDL.DDL.TableInfo, | ||
| PreTableInfo: rv1.RedoDDL.DDL.PreTableInfo, | ||
| Type: rv1.RedoDDL.DDL.Type, | ||
| } | ||
| r.RedoDDL.DDL.Done.Store(rv1.RedoDDL.DDL.Done) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func tableNameFromV1(t *codecv1.TableName) *model.TableName { | ||
| return &model.TableName{ | ||
| Schema: t.Schema, | ||
| Table: t.Table, | ||
| TableID: t.TableID, | ||
| IsPartition: t.IsPartition, | ||
| } | ||
| } | ||
|
|
||
| func columnFromV1(c *codecv1.Column) *model.Column { | ||
| return &model.Column{ | ||
| Name: c.Name, | ||
| Type: c.Type, | ||
| Charset: c.Charset, | ||
| Flag: c.Flag, | ||
| Value: c.Value, | ||
| ApproximateBytes: c.ApproximateBytes, | ||
| } | ||
| } |
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