(Blog) Find the largest event in a binary log file

largest_event.go

/*
  @File : largest_event.go
  @Description : Find the largest event in a binary log file.
  @Usage : ./largest_event.go -file=<binary log file>
*/

package main

import (
	"flag"
	"fmt"
	"github.com/vaquita/mysql"
	"os"
)

func main() {
	var (
		b         mysql.Binlog
		dsn       string
		eventName string
		eventSize uint32
		file      string
	)

	flag.StringVar(&file, "file", "/tmp/master-bin.000001",
		"Binary log file (absolute path)")
	flag.Parse()

	dsn = fmt.Sprint("file://", file)

	// Open a binary log handle
	if err := b.Connect(dsn); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	// Start reading from the specified binary log file
	if err := b.Begin(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	// Close the binary log handle
	defer b.Close()

	// Iterate through the events
	for b.Next() {
		re, err := b.RawEvent()

		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		if re.Size() > eventSize {
			eventSize = re.Size()
			eventName = re.Name()
		}
	}

	fmt.Println("Event :", eventName)
	fmt.Println("Size  :", eventSize)
}