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tables_filter.go
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tables_filter.go
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// Copyright 2012, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package binlog
import (
"strings"
log "github.com/golang/glog"
binlogdatapb "github.com/youtube/vitess/go/vt/proto/binlogdata"
querypb "github.com/youtube/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)
}
}