add ledis-dump tool

cmd/ledis-dump/main.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"github.com/siddontang/ledisdb/server"
+	"net"
+	"os"
+)
+
+var host = flag.String("host", "127.0.0.1", "ledis server host")
+var port = flag.Int("port", 6380, "ledis server port")
+var sock = flag.String("sock", "", "ledis unix socket domain")
+var dumpFile = flag.String("o", "./ledis.dump", "dump file to save")
+
+var fullSyncCmd = []byte("*1\r\n$8\r\nfullsync\r\n") //fullsync
+
+func main() {
+	flag.Parse()
+
+	var c net.Conn
+	var err error
+	var f *os.File
+
+	if f, err = os.OpenFile(*dumpFile, os.O_CREATE|os.O_WRONLY, os.ModePerm); err != nil {
+		println(err.Error())
+		return
+	}
+
+	defer f.Close()
+
+	if len(*sock) != 0 {
+		c, err = net.Dial("unix", *sock)
+	} else {
+		addr := fmt.Sprintf("%s:%d", *host, *port)
+		c, err = net.Dial("tcp", addr)
+	}
+
+	if err != nil {
+		println(err.Error())
+		return
+	}
+
+	defer c.Close()
+
+	println("dump begin")
+
+	if _, err = c.Write(fullSyncCmd); err != nil {
+		println(err.Error())
+		return
+	}
+
+	rb := bufio.NewReaderSize(c, 16*1024)
+
+	if err = server.ReadBulkTo(rb, f); err != nil {
+		println(err.Error())
+		return
+	}
+
+	println("dump end")
+}

server/client.go

@@ -81,7 +81,7 @@ func (c *client) run() {
 }
 
 func (c *client) readLine() ([]byte, error) {
-	return readLine(c.rb)
+	return ReadLine(c.rb)
 }
 
 //A client sends to the Redis server a RESP Array consisting of just Bulk Strings.

server/replication.go

@@ -254,7 +254,7 @@ func (m *master) fullSync() error {
 
 	defer os.Remove(dumpPath)
 
-	err = readBulkTo(m.rb, f)
+	err = ReadBulkTo(m.rb, f)
 	f.Close()
 	if err != nil {
 		log.Error("read dump data error %s", err.Error())
@@ -291,7 +291,7 @@ func (m *master) sync() error {
 
 	m.syncBuf.Reset()
 
-	err := readBulkTo(m.rb, &m.syncBuf)
+	err := ReadBulkTo(m.rb, &m.syncBuf)
 	if err != nil {
 		return err
 	}

server/util.go

@@ -14,7 +14,7 @@ var (
 	errLineFormat  = errors.New("bad response line format")
 )
 
-func readLine(rb *bufio.Reader) ([]byte, error) {
+func ReadLine(rb *bufio.Reader) ([]byte, error) {
 	p, err := rb.ReadSlice('\n')
 
 	if err != nil {
@@ -27,8 +27,8 @@ func readLine(rb *bufio.Reader) ([]byte, error) {
 	return p[:i], nil
 }
 
-func readBulkTo(rb *bufio.Reader, w io.Writer) error {
-	l, err := readLine(rb)
+func ReadBulkTo(rb *bufio.Reader, w io.Writer) error {
+	l, err := ReadLine(rb)
 	if len(l) == 0 {
 		return errBulkFormat
 	} else if l[0] == '$' {
@@ -43,7 +43,7 @@ func readBulkTo(rb *bufio.Reader, w io.Writer) error {
 				return err
 			}
 
-			if l, err = readLine(rb); err != nil {
+			if l, err = ReadLine(rb); err != nil {
 				return err
 			} else if len(l) != 0 {
 				return errBulkFormat