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tables_filter.go
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tables_filter.go
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/*
Copyright 2019 The Vitess 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 binlog
import (
"strings"
"vitess.io/vitess/go/vt/log"
binlogdatapb "vitess.io/vitess/go/vt/proto/binlogdata"
querypb "vitess.io/vitess/go/vt/proto/query"
)
const (
streamComment = "/* _stream "
space = " "
)
// tablesFilterFunc returns a function that calls callback only if statements
// in the transaction match the specified tables. The resulting function can be
// passed into the Streamer: bls.Stream(file, pos, sendTransaction) ->
// bls.Stream(file, pos, tablesFilterFunc(sendTransaction))
func tablesFilterFunc(tables []string, callback func(*binlogdatapb.BinlogTransaction) error) sendTransactionFunc {
return func(eventToken *querypb.EventToken, statements []FullBinlogStatement) error {
matched := false
filtered := make([]*binlogdatapb.BinlogTransaction_Statement, 0, len(statements))
for _, statement := range statements {
switch statement.Statement.Category {
case binlogdatapb.BinlogTransaction_Statement_BL_SET:
filtered = append(filtered, statement.Statement)
case binlogdatapb.BinlogTransaction_Statement_BL_DDL:
log.Warningf("Not forwarding DDL: %s", statement.Statement.Sql)
continue
case binlogdatapb.BinlogTransaction_Statement_BL_INSERT,
binlogdatapb.BinlogTransaction_Statement_BL_UPDATE,
binlogdatapb.BinlogTransaction_Statement_BL_DELETE:
tableName := statement.Table
if tableName == "" {
// The statement doesn't
// contain the table name (SBR
// event), figure it out.
sql := string(statement.Statement.Sql)
tableIndex := strings.LastIndex(sql, streamComment)
if tableIndex == -1 {
updateStreamErrors.Add("TablesStream", 1)
log.Errorf("Error parsing table name: %s", sql)
continue
}
tableStart := tableIndex + len(streamComment)
tableEnd := strings.Index(sql[tableStart:], space)
if tableEnd == -1 {
updateStreamErrors.Add("TablesStream", 1)
log.Errorf("Error parsing table name: %s", sql)
continue
}
tableName = sql[tableStart : tableStart+tableEnd]
}
for _, t := range tables {
if t == tableName {
filtered = append(filtered, statement.Statement)
matched = true
break
}
}
case binlogdatapb.BinlogTransaction_Statement_BL_UNRECOGNIZED:
updateStreamErrors.Add("TablesStream", 1)
log.Errorf("Error parsing table name: %s", string(statement.Statement.Sql))
continue
}
}
trans := &binlogdatapb.BinlogTransaction{
EventToken: eventToken,
}
if matched {
trans.Statements = filtered
}
return callback(trans)
}
}