add handle binlog tool

cmd/ledis-binlog/main.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"github.com/siddontang/ledisdb/ledis"
+	"os"
+	"time"
+)
+
+var TimeFormat = "2006-01-02 15:04:05"
+
+var startDateTime = flag.String("start-datetime", "",
+	"Start reading the binary log at the first event having a timestamp equal to or later than the datetime argument.")
+var stopDateTime = flag.String("stop-datetime", "",
+	"Stop reading the binary log at the first event having a timestamp equal to or earlier than the datetime argument.")
+
+var startTime uint32 = 0
+var stopTime uint32 = 0xFFFFFFFF
+
+func main() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage of %s [options] log_file\n", os.Args[0])
+		flag.PrintDefaults()
+	}
+
+	flag.Parse()
+
+	logFile := flag.Arg(0)
+	f, err := os.Open(logFile)
+	if err != nil {
+		println(err.Error())
+		return
+	}
+	defer f.Close()
+
+	var t time.Time
+
+	if len(*startDateTime) > 0 {
+		if t, err = time.Parse(TimeFormat, *startDateTime); err != nil {
+			println("parse start-datetime error: ", err.Error())
+			return
+		}
+
+		startTime = uint32(t.Unix())
+	}
+
+	if len(*stopDateTime) > 0 {
+		if t, err = time.Parse(TimeFormat, *stopDateTime); err != nil {
+			println("parse stop-datetime error: ", err.Error())
+			return
+		}
+
+		stopTime = uint32(t.Unix())
+	}
+
+	rb := bufio.NewReaderSize(f, 4096)
+	err = ledis.ReadEventFromReader(rb, printEvent)
+	if err != nil {
+		println("read event error: ", err.Error())
+		return
+	}
+}
+
+func printEvent(createTime uint32, event []byte) error {
+	if createTime < startTime || createTime > stopTime {
+		return nil
+	}
+
+	t := time.Unix(int64(createTime), 0)
+
+	fmt.Printf("%s ", t.Format(TimeFormat))
+
+	s, err := ledis.FormatBinLogEvent(event)
+	if err != nil {
+		fmt.Printf("%s", err.Error())
+	} else {
+		fmt.Printf(s)
+	}
+
+	fmt.Printf("\n")
+
+	return nil
+}