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/
mydumper.go
74 lines (67 loc) · 1.93 KB
/
mydumper.go
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// Copyright 2019 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 utils
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
"github.com/siddontang/go-mysql/mysql"
"github.com/pingcap/dm/pkg/terror"
)
// ParseMetaData parses mydumper's output meta file and returns binlog position
func ParseMetaData(filename string) (*mysql.Position, error) {
fd, err := os.Open(filename)
if err != nil {
return nil, terror.ErrParseMydumperMeta.Generate(err)
}
defer fd.Close()
var logName = ""
br := bufio.NewReader(fd)
for {
line, err := br.ReadString('\n')
if err == io.EOF {
break
} else if err != nil {
return nil, terror.ErrParseMydumperMeta.Generate(err)
}
line = strings.TrimSpace(line[:len(line)-1])
if len(line) == 0 {
continue
}
// ref: https://github.com/maxbube/mydumper/blob/master/mydumper.c#L434
if strings.Contains(line, "SHOW SLAVE STATUS") {
// now, we only parse log / pos for `SHOW MASTER STATUS`
break
}
parts := strings.Split(line, ": ")
if len(parts) != 2 {
continue
}
if parts[0] == "Log" {
logName = parts[1]
} else if parts[0] == "Pos" {
pos64, err := strconv.ParseUint(parts[1], 10, 32)
if err != nil {
return nil, terror.ErrParseMydumperMeta.Generate(err)
}
if len(logName) > 0 {
return &mysql.Position{Name: logName, Pos: uint32(pos64)}, nil
}
break // Pos extracted, but no Log, error occurred
}
}
return nil, terror.ErrParseMydumperMeta.Generate(fmt.Sprintf("file %s invalid format", filename))
}