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open_protocol_message.go
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open_protocol_message.go
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// Copyright 2022 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 open
import (
"bytes"
"encoding/json"
"sort"
"strings"
timodel "github.com/pingcap/tidb/pkg/parser/model"
"github.com/pingcap/tiflow/cdc/model"
cerror "github.com/pingcap/tiflow/pkg/errors"
"github.com/pingcap/tiflow/pkg/sink/codec"
"github.com/pingcap/tiflow/pkg/sink/codec/common"
"github.com/pingcap/tiflow/pkg/sink/codec/internal"
)
type columnsArray []*model.Column
func (a columnsArray) Len() int {
return len(a)
}
func (a columnsArray) Less(i, j int) bool {
return a[i].Name < a[j].Name
}
func (a columnsArray) Swap(i, j int) {
a[i], a[j] = a[j], a[i]
}
// sortColumnArrays sort column arrays by name
func sortColumnArrays(arrays ...[]*model.Column) {
for _, array := range arrays {
if array != nil {
sort.Sort(columnsArray(array))
}
}
}
type messageRow struct {
Update map[string]internal.Column `json:"u,omitempty"`
PreColumns map[string]internal.Column `json:"p,omitempty"`
Delete map[string]internal.Column `json:"d,omitempty"`
}
func (m *messageRow) encode() ([]byte, error) {
data, err := json.Marshal(m)
return data, cerror.WrapError(cerror.ErrMarshalFailed, err)
}
func (m *messageRow) decode(data []byte) error {
decoder := json.NewDecoder(bytes.NewReader(data))
decoder.UseNumber()
err := decoder.Decode(m)
if err != nil {
return cerror.WrapError(cerror.ErrUnmarshalFailed, err)
}
for colName, column := range m.Update {
m.Update[colName] = internal.FormatColumn(column)
}
for colName, column := range m.Delete {
m.Delete[colName] = internal.FormatColumn(column)
}
for colName, column := range m.PreColumns {
m.PreColumns[colName] = internal.FormatColumn(column)
}
return nil
}
func (m *messageRow) dropNotUpdatedColumns() {
// if the column is not updated, do not output it.
for col, value := range m.Update {
oldValue, ok := m.PreColumns[col]
if !ok {
continue
}
// sql type is not equal
if value.Type != oldValue.Type {
continue
}
// value equal
if codec.IsColumnValueEqual(oldValue.Value, value.Value) {
delete(m.PreColumns, col)
}
}
}
type messageDDL struct {
Query string `json:"q"`
Type timodel.ActionType `json:"t"`
}
func (m *messageDDL) encode() ([]byte, error) {
data, err := json.Marshal(m)
return data, cerror.WrapError(cerror.ErrMarshalFailed, err)
}
func (m *messageDDL) decode(data []byte) error {
return cerror.WrapError(cerror.ErrUnmarshalFailed, json.Unmarshal(data, m))
}
func newResolvedMessage(ts uint64) *internal.MessageKey {
return &internal.MessageKey{
Ts: ts,
Type: model.MessageTypeResolved,
}
}
func rowChangeToMsg(
e *model.RowChangedEvent,
config *common.Config,
largeMessageOnlyHandleKeyColumns bool) (*internal.MessageKey, *messageRow, error) {
var partition *int64
if e.TableInfo.IsPartitionTable() {
tableID := e.GetTableID()
partition = &tableID
}
key := &internal.MessageKey{
Ts: e.CommitTs,
Schema: e.TableInfo.GetSchemaName(),
Table: e.TableInfo.GetTableName(),
RowID: e.RowID,
Partition: partition,
Type: model.MessageTypeRow,
OnlyHandleKey: largeMessageOnlyHandleKeyColumns,
}
value := &messageRow{}
if e.IsDelete() {
onlyHandleKeyColumns := config.DeleteOnlyHandleKeyColumns || largeMessageOnlyHandleKeyColumns
value.Delete = rowChangeColumns2CodecColumns(e.GetPreColumns(), onlyHandleKeyColumns)
if onlyHandleKeyColumns && len(value.Delete) == 0 {
return nil, nil, cerror.ErrOpenProtocolCodecInvalidData.GenWithStack("not found handle key columns for the delete event")
}
} else if e.IsUpdate() {
value.Update = rowChangeColumns2CodecColumns(e.GetColumns(), largeMessageOnlyHandleKeyColumns)
if config.OpenOutputOldValue {
value.PreColumns = rowChangeColumns2CodecColumns(e.GetPreColumns(), largeMessageOnlyHandleKeyColumns)
}
if largeMessageOnlyHandleKeyColumns && (len(value.Update) == 0 ||
(len(value.PreColumns) == 0 && config.OpenOutputOldValue)) {
return nil, nil, cerror.ErrOpenProtocolCodecInvalidData.GenWithStack("not found handle key columns for the update event")
}
if config.OnlyOutputUpdatedColumns {
value.dropNotUpdatedColumns()
}
} else {
value.Update = rowChangeColumns2CodecColumns(e.GetColumns(), largeMessageOnlyHandleKeyColumns)
if largeMessageOnlyHandleKeyColumns && len(value.Update) == 0 {
return nil, nil, cerror.ErrOpenProtocolCodecInvalidData.GenWithStack("not found handle key columns for the insert event")
}
}
return key, value, nil
}
func msgToRowChange(key *internal.MessageKey, value *messageRow) *model.RowChangedEvent {
e := new(model.RowChangedEvent)
// TODO: we lost the startTs from kafka message
// startTs-based txn filter is out of work
e.CommitTs = key.Ts
if len(value.Delete) != 0 {
preCols := codecColumns2RowChangeColumns(value.Delete)
sortColumnArrays(preCols)
indexColumns := model.GetHandleAndUniqueIndexOffsets4Test(preCols)
e.TableInfo = model.BuildTableInfo(key.Schema, key.Table, preCols, indexColumns)
e.PreColumns = model.Columns2ColumnDatas(preCols, e.TableInfo)
} else {
cols := codecColumns2RowChangeColumns(value.Update)
preCols := codecColumns2RowChangeColumns(value.PreColumns)
sortColumnArrays(cols)
sortColumnArrays(preCols)
indexColumns := model.GetHandleAndUniqueIndexOffsets4Test(cols)
e.TableInfo = model.BuildTableInfo(key.Schema, key.Table, cols, indexColumns)
e.Columns = model.Columns2ColumnDatas(cols, e.TableInfo)
e.PreColumns = model.Columns2ColumnDatas(preCols, e.TableInfo)
}
// TODO: we lost the tableID from kafka message
if key.Partition != nil {
e.PhysicalTableID = *key.Partition
e.TableInfo.TableName.IsPartition = true
}
return e
}
func rowChangeColumns2CodecColumns(cols []*model.Column, onlyHandleKeyColumns bool) map[string]internal.Column {
jsonCols := make(map[string]internal.Column, len(cols))
for _, col := range cols {
if col == nil {
continue
}
if onlyHandleKeyColumns && !col.Flag.IsHandleKey() {
continue
}
c := internal.Column{}
c.FromRowChangeColumn(col)
jsonCols[col.Name] = c
}
if len(jsonCols) == 0 {
return nil
}
return jsonCols
}
func codecColumns2RowChangeColumns(cols map[string]internal.Column) []*model.Column {
sinkCols := make([]*model.Column, 0, len(cols))
for name, col := range cols {
c := col.ToRowChangeColumn(name)
sinkCols = append(sinkCols, c)
}
if len(sinkCols) == 0 {
return nil
}
sort.Slice(sinkCols, func(i, j int) bool {
return strings.Compare(sinkCols[i].Name, sinkCols[j].Name) > 0
})
return sinkCols
}
func ddlEventToMsg(e *model.DDLEvent) (*internal.MessageKey, *messageDDL) {
key := &internal.MessageKey{
Ts: e.CommitTs,
Schema: e.TableInfo.TableName.Schema,
Table: e.TableInfo.TableName.Table,
Type: model.MessageTypeDDL,
}
value := &messageDDL{
Query: e.Query,
Type: e.Type,
}
return key, value
}
func msgToDDLEvent(key *internal.MessageKey, value *messageDDL) *model.DDLEvent {
e := new(model.DDLEvent)
e.TableInfo = new(model.TableInfo)
// TODO: we lost the startTs from kafka message
// startTs-based txn filter is out of work
e.CommitTs = key.Ts
e.TableInfo.TableName = model.TableName{
Schema: key.Schema,
Table: key.Table,
}
e.Type = value.Type
e.Query = value.Query
return e
}