diff --git a/vendor/github.com/siddontang/go/log/doc.go b/vendor/github.com/siddontang/go/log/doc.go
new file mode 100644
index 0000000..81a60ee
--- /dev/null
+++ b/vendor/github.com/siddontang/go/log/doc.go
@@ -0,0 +1,21 @@
+// log package supplies more advanced features than go orign log package.
+//
+// It supports log different level: trace, debug, info, warn, error, fatal.
+//
+// It also supports different log handlers which you can log to stdout, file, socket, etc...
+//
+// Use
+//
+//  import "github.com/siddontang/go/log"
+//
+//  //log with different level
+//  log.Info("hello world")
+//  log.Error("hello world")
+//
+//  //create a logger with specified handler
+//  h := NewStreamHandler(os.Stdout)
+//  l := log.NewDefault(h)
+//  l.Info("hello world")
+//  l.Infof("%s %d", "hello", 123)
+//
+package log
diff --git a/vendor/github.com/siddontang/go/log/filehandler.go b/vendor/github.com/siddontang/go/log/filehandler.go
new file mode 100644
index 0000000..308896a
--- /dev/null
+++ b/vendor/github.com/siddontang/go/log/filehandler.go
@@ -0,0 +1,200 @@
+package log
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"time"
+)
+
+//FileHandler writes log to a file.
+type FileHandler struct {
+	fd *os.File
+}
+
+func NewFileHandler(fileName string, flag int) (*FileHandler, error) {
+	dir := path.Dir(fileName)
+	os.Mkdir(dir, 0777)
+
+	f, err := os.OpenFile(fileName, flag, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	h := new(FileHandler)
+
+	h.fd = f
+
+	return h, nil
+}
+
+func (h *FileHandler) Write(b []byte) (n int, err error) {
+	return h.fd.Write(b)
+}
+
+func (h *FileHandler) Close() error {
+	return h.fd.Close()
+}
+
+//RotatingFileHandler writes log a file, if file size exceeds maxBytes,
+//it will backup current file and open a new one.
+//
+//max backup file number is set by backupCount, it will delete oldest if backups too many.
+type RotatingFileHandler struct {
+	fd *os.File
+
+	fileName    string
+	maxBytes    int
+	backupCount int
+}
+
+func NewRotatingFileHandler(fileName string, maxBytes int, backupCount int) (*RotatingFileHandler, error) {
+	dir := path.Dir(fileName)
+	os.Mkdir(dir, 0777)
+
+	h := new(RotatingFileHandler)
+
+	if maxBytes <= 0 {
+		return nil, fmt.Errorf("invalid max bytes")
+	}
+
+	h.fileName = fileName
+	h.maxBytes = maxBytes
+	h.backupCount = backupCount
+
+	var err error
+	h.fd, err = os.OpenFile(fileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+	if err != nil {
+		return nil, err
+	}
+
+	return h, nil
+}
+
+func (h *RotatingFileHandler) Write(p []byte) (n int, err error) {
+	h.doRollover()
+	return h.fd.Write(p)
+}
+
+func (h *RotatingFileHandler) Close() error {
+	if h.fd != nil {
+		return h.fd.Close()
+	}
+	return nil
+}
+
+func (h *RotatingFileHandler) doRollover() {
+	f, err := h.fd.Stat()
+	if err != nil {
+		return
+	}
+
+	if h.maxBytes <= 0 {
+		return
+	} else if f.Size() < int64(h.maxBytes) {
+		return
+	}
+
+	if h.backupCount > 0 {
+		h.fd.Close()
+
+		for i := h.backupCount - 1; i > 0; i-- {
+			sfn := fmt.Sprintf("%s.%d", h.fileName, i)
+			dfn := fmt.Sprintf("%s.%d", h.fileName, i+1)
+
+			os.Rename(sfn, dfn)
+		}
+
+		dfn := fmt.Sprintf("%s.1", h.fileName)
+		os.Rename(h.fileName, dfn)
+
+		h.fd, _ = os.OpenFile(h.fileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+	}
+}
+
+//TimeRotatingFileHandler writes log to a file,
+//it will backup current and open a new one, with a period time you sepecified.
+//
+//refer: http://docs.python.org/2/library/logging.handlers.html.
+//same like python TimedRotatingFileHandler.
+type TimeRotatingFileHandler struct {
+	fd *os.File
+
+	baseName   string
+	interval   int64
+	suffix     string
+	rolloverAt int64
+}
+
+const (
+	WhenSecond = iota
+	WhenMinute
+	WhenHour
+	WhenDay
+)
+
+func NewTimeRotatingFileHandler(baseName string, when int8, interval int) (*TimeRotatingFileHandler, error) {
+	dir := path.Dir(baseName)
+	os.Mkdir(dir, 0777)
+
+	h := new(TimeRotatingFileHandler)
+
+	h.baseName = baseName
+
+	switch when {
+	case WhenSecond:
+		h.interval = 1
+		h.suffix = "2006-01-02_15-04-05"
+	case WhenMinute:
+		h.interval = 60
+		h.suffix = "2006-01-02_15-04"
+	case WhenHour:
+		h.interval = 3600
+		h.suffix = "2006-01-02_15"
+	case WhenDay:
+		h.interval = 3600 * 24
+		h.suffix = "2006-01-02"
+	default:
+		return nil, fmt.Errorf("invalid when_rotate: %d", when)
+	}
+
+	h.interval = h.interval * int64(interval)
+
+	var err error
+	h.fd, err = os.OpenFile(h.baseName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+	if err != nil {
+		return nil, err
+	}
+
+	fInfo, _ := h.fd.Stat()
+	h.rolloverAt = fInfo.ModTime().Unix() + h.interval
+
+	return h, nil
+}
+
+func (h *TimeRotatingFileHandler) doRollover() {
+	//refer http://hg.python.org/cpython/file/2.7/Lib/logging/handlers.py
+	now := time.Now()
+
+	if h.rolloverAt <= now.Unix() {
+		fName := h.baseName + now.Format(h.suffix)
+		h.fd.Close()
+		e := os.Rename(h.baseName, fName)
+		if e != nil {
+			panic(e)
+		}
+
+		h.fd, _ = os.OpenFile(h.baseName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+
+		h.rolloverAt = time.Now().Unix() + h.interval
+	}
+}
+
+func (h *TimeRotatingFileHandler) Write(b []byte) (n int, err error) {
+	h.doRollover()
+	return h.fd.Write(b)
+}
+
+func (h *TimeRotatingFileHandler) Close() error {
+	return h.fd.Close()
+}
diff --git a/vendor/github.com/siddontang/go/log/handler.go b/vendor/github.com/siddontang/go/log/handler.go
new file mode 100644
index 0000000..4dc086f
--- /dev/null
+++ b/vendor/github.com/siddontang/go/log/handler.go
@@ -0,0 +1,48 @@
+package log
+
+import (
+	"io"
+)
+
+//Handler writes logs to somewhere
+type Handler interface {
+	Write(p []byte) (n int, err error)
+	Close() error
+}
+
+//StreamHandler writes logs to a specified io Writer, maybe stdout, stderr, etc...
+type StreamHandler struct {
+	w io.Writer
+}
+
+func NewStreamHandler(w io.Writer) (*StreamHandler, error) {
+	h := new(StreamHandler)
+
+	h.w = w
+
+	return h, nil
+}
+
+func (h *StreamHandler) Write(b []byte) (n int, err error) {
+	return h.w.Write(b)
+}
+
+func (h *StreamHandler) Close() error {
+	return nil
+}
+
+//NullHandler does nothing, it discards anything.
+type NullHandler struct {
+}
+
+func NewNullHandler() (*NullHandler, error) {
+	return new(NullHandler), nil
+}
+
+func (h *NullHandler) Write(b []byte) (n int, err error) {
+	return len(b), nil
+}
+
+func (h *NullHandler) Close() {
+
+}
diff --git a/vendor/github.com/siddontang/go/log/log.go b/vendor/github.com/siddontang/go/log/log.go
new file mode 100644
index 0000000..f2e5ef2
--- /dev/null
+++ b/vendor/github.com/siddontang/go/log/log.go
@@ -0,0 +1,366 @@
+package log
+
+import (
+	"fmt"
+	"os"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+//log level, from low to high, more high means more serious
+const (
+	LevelTrace = iota
+	LevelDebug
+	LevelInfo
+	LevelWarn
+	LevelError
+	LevelFatal
+)
+
+const (
+	Ltime  = 1 << iota //time format "2006/01/02 15:04:05"
+	Lfile              //file.go:123
+	Llevel             //[Trace|Debug|Info...]
+)
+
+var LevelName [6]string = [6]string{"Trace", "Debug", "Info", "Warn", "Error", "Fatal"}
+
+const TimeFormat = "2006/01/02 15:04:05"
+
+const maxBufPoolSize = 16
+
+type atomicInt32 int32
+
+func (i *atomicInt32) Set(n int) {
+	atomic.StoreInt32((*int32)(i), int32(n))
+}
+
+func (i *atomicInt32) Get() int {
+	return int(atomic.LoadInt32((*int32)(i)))
+}
+
+type Logger struct {
+	level atomicInt32
+	flag  int
+
+	hMutex  sync.Mutex
+	handler Handler
+
+	quit chan struct{}
+	msg  chan []byte
+
+	bufMutex sync.Mutex
+	bufs     [][]byte
+
+	wg sync.WaitGroup
+
+	closed atomicInt32
+}
+
+//new a logger with specified handler and flag
+func New(handler Handler, flag int) *Logger {
+	var l = new(Logger)
+
+	l.level.Set(LevelInfo)
+	l.handler = handler
+
+	l.flag = flag
+
+	l.quit = make(chan struct{})
+	l.closed.Set(0)
+
+	l.msg = make(chan []byte, 1024)
+
+	l.bufs = make([][]byte, 0, 16)
+
+	l.wg.Add(1)
+	go l.run()
+
+	return l
+}
+
+//new a default logger with specified handler and flag: Ltime|Lfile|Llevel
+func NewDefault(handler Handler) *Logger {
+	return New(handler, Ltime|Lfile|Llevel)
+}
+
+func newStdHandler() *StreamHandler {
+	h, _ := NewStreamHandler(os.Stdout)
+	return h
+}
+
+var std = NewDefault(newStdHandler())
+
+func (l *Logger) run() {
+	defer l.wg.Done()
+	for {
+		select {
+		case msg := <-l.msg:
+			l.hMutex.Lock()
+			l.handler.Write(msg)
+			l.hMutex.Unlock()
+			l.putBuf(msg)
+		case <-l.quit:
+			//we must log all msg
+			if len(l.msg) == 0 {
+				return
+			}
+		}
+	}
+}
+
+func (l *Logger) popBuf() []byte {
+	l.bufMutex.Lock()
+	var buf []byte
+	if len(l.bufs) == 0 {
+		buf = make([]byte, 0, 1024)
+	} else {
+		buf = l.bufs[len(l.bufs)-1]
+		l.bufs = l.bufs[0 : len(l.bufs)-1]
+	}
+	l.bufMutex.Unlock()
+
+	return buf
+}
+
+func (l *Logger) putBuf(buf []byte) {
+	l.bufMutex.Lock()
+	if len(l.bufs) < maxBufPoolSize {
+		buf = buf[0:0]
+		l.bufs = append(l.bufs, buf)
+	}
+	l.bufMutex.Unlock()
+}
+
+func (l *Logger) Close() {
+	if l.closed.Get() == 1 {
+		return
+	}
+	l.closed.Set(1)
+
+	close(l.quit)
+
+	l.wg.Wait()
+
+	l.quit = nil
+
+	l.handler.Close()
+}
+
+//set log level, any log level less than it will not log
+func (l *Logger) SetLevel(level int) {
+	l.level.Set(level)
+}
+
+// name can be in ["trace", "debug", "info", "warn", "error", "fatal"]
+func (l *Logger) SetLevelByName(name string) {
+	name = strings.ToLower(name)
+	switch name {
+	case "trace":
+		l.SetLevel(LevelTrace)
+	case "debug":
+		l.SetLevel(LevelDebug)
+	case "info":
+		l.SetLevel(LevelInfo)
+	case "warn":
+		l.SetLevel(LevelWarn)
+	case "error":
+		l.SetLevel(LevelError)
+	case "fatal":
+		l.SetLevel(LevelFatal)
+	}
+}
+
+func (l *Logger) SetHandler(h Handler) {
+	if l.closed.Get() == 1 {
+		return
+	}
+
+	l.hMutex.Lock()
+	if l.handler != nil {
+		l.handler.Close()
+	}
+	l.handler = h
+	l.hMutex.Unlock()
+}
+
+func (l *Logger) Output(callDepth int, level int, s string) {
+	if l.closed.Get() == 1 {
+		// closed
+		return
+	}
+
+	if l.level.Get() > level {
+		// higher level can be logged
+		return
+	}
+
+	buf := l.popBuf()
+
+	if l.flag&Ltime > 0 {
+		now := time.Now().Format(TimeFormat)
+		buf = append(buf, '[')
+		buf = append(buf, now...)
+		buf = append(buf, "] "...)
+	}
+
+	if l.flag&Lfile > 0 {
+		_, file, line, ok := runtime.Caller(callDepth)
+		if !ok {
+			file = "???"
+			line = 0
+		} else {
+			for i := len(file) - 1; i > 0; i-- {
+				if file[i] == '/' {
+					file = file[i+1:]
+					break
+				}
+			}
+		}
+
+		buf = append(buf, file...)
+		buf = append(buf, ':')
+
+		buf = strconv.AppendInt(buf, int64(line), 10)
+		buf = append(buf, ' ')
+	}
+
+	if l.flag&Llevel > 0 {
+		buf = append(buf, '[')
+		buf = append(buf, LevelName[level]...)
+		buf = append(buf, "] "...)
+	}
+
+	buf = append(buf, s...)
+
+	if s[len(s)-1] != '\n' {
+		buf = append(buf, '\n')
+	}
+
+	l.msg <- buf
+}
+
+//log with Trace level
+func (l *Logger) Trace(v ...interface{}) {
+	l.Output(2, LevelTrace, fmt.Sprint(v...))
+}
+
+//log with Debug level
+func (l *Logger) Debug(v ...interface{}) {
+	l.Output(2, LevelDebug, fmt.Sprint(v...))
+}
+
+//log with info level
+func (l *Logger) Info(v ...interface{}) {
+	l.Output(2, LevelInfo, fmt.Sprint(v...))
+}
+
+//log with warn level
+func (l *Logger) Warn(v ...interface{}) {
+	l.Output(2, LevelWarn, fmt.Sprint(v...))
+}
+
+//log with error level
+func (l *Logger) Error(v ...interface{}) {
+	l.Output(2, LevelError, fmt.Sprint(v...))
+}
+
+//log with fatal level
+func (l *Logger) Fatal(v ...interface{}) {
+	l.Output(2, LevelFatal, fmt.Sprint(v...))
+}
+
+//log with Trace level
+func (l *Logger) Tracef(format string, v ...interface{}) {
+	l.Output(2, LevelTrace, fmt.Sprintf(format, v...))
+}
+
+//log with Debug level
+func (l *Logger) Debugf(format string, v ...interface{}) {
+	l.Output(2, LevelDebug, fmt.Sprintf(format, v...))
+}
+
+//log with info level
+func (l *Logger) Infof(format string, v ...interface{}) {
+	l.Output(2, LevelInfo, fmt.Sprintf(format, v...))
+}
+
+//log with warn level
+func (l *Logger) Warnf(format string, v ...interface{}) {
+	l.Output(2, LevelWarn, fmt.Sprintf(format, v...))
+}
+
+//log with error level
+func (l *Logger) Errorf(format string, v ...interface{}) {
+	l.Output(2, LevelError, fmt.Sprintf(format, v...))
+}
+
+//log with fatal level
+func (l *Logger) Fatalf(format string, v ...interface{}) {
+	l.Output(2, LevelFatal, fmt.Sprintf(format, v...))
+}
+
+func SetLevel(level int) {
+	std.SetLevel(level)
+}
+
+// name can be in ["trace", "debug", "info", "warn", "error", "fatal"]
+func SetLevelByName(name string) {
+	std.SetLevelByName(name)
+}
+
+func SetHandler(h Handler) {
+	std.SetHandler(h)
+}
+
+func Trace(v ...interface{}) {
+	std.Output(2, LevelTrace, fmt.Sprint(v...))
+}
+
+func Debug(v ...interface{}) {
+	std.Output(2, LevelDebug, fmt.Sprint(v...))
+}
+
+func Info(v ...interface{}) {
+	std.Output(2, LevelInfo, fmt.Sprint(v...))
+}
+
+func Warn(v ...interface{}) {
+	std.Output(2, LevelWarn, fmt.Sprint(v...))
+}
+
+func Error(v ...interface{}) {
+	std.Output(2, LevelError, fmt.Sprint(v...))
+}
+
+func Fatal(v ...interface{}) {
+	std.Output(2, LevelFatal, fmt.Sprint(v...))
+}
+
+func Tracef(format string, v ...interface{}) {
+	std.Output(2, LevelTrace, fmt.Sprintf(format, v...))
+}
+
+func Debugf(format string, v ...interface{}) {
+	std.Output(2, LevelDebug, fmt.Sprintf(format, v...))
+}
+
+func Infof(format string, v ...interface{}) {
+	std.Output(2, LevelInfo, fmt.Sprintf(format, v...))
+}
+
+func Warnf(format string, v ...interface{}) {
+	std.Output(2, LevelWarn, fmt.Sprintf(format, v...))
+}
+
+func Errorf(format string, v ...interface{}) {
+	std.Output(2, LevelError, fmt.Sprintf(format, v...))
+}
+
+func Fatalf(format string, v ...interface{}) {
+	std.Output(2, LevelFatal, fmt.Sprintf(format, v...))
+}
diff --git a/vendor/github.com/siddontang/go/log/sockethandler.go b/vendor/github.com/siddontang/go/log/sockethandler.go
new file mode 100644
index 0000000..3e7494d
--- /dev/null
+++ b/vendor/github.com/siddontang/go/log/sockethandler.go
@@ -0,0 +1,65 @@
+package log
+
+import (
+	"encoding/binary"
+	"net"
+	"time"
+)
+
+//SocketHandler writes log to a connectionl.
+//Network protocol is simple: log length + log | log length + log. log length is uint32, bigendian.
+//you must implement your own log server, maybe you can use logd instead simply.
+type SocketHandler struct {
+	c        net.Conn
+	protocol string
+	addr     string
+}
+
+func NewSocketHandler(protocol string, addr string) (*SocketHandler, error) {
+	s := new(SocketHandler)
+
+	s.protocol = protocol
+	s.addr = addr
+
+	return s, nil
+}
+
+func (h *SocketHandler) Write(p []byte) (n int, err error) {
+	if err = h.connect(); err != nil {
+		return
+	}
+
+	buf := make([]byte, len(p)+4)
+
+	binary.BigEndian.PutUint32(buf, uint32(len(p)))
+
+	copy(buf[4:], p)
+
+	n, err = h.c.Write(buf)
+	if err != nil {
+		h.c.Close()
+		h.c = nil
+	}
+	return
+}
+
+func (h *SocketHandler) Close() error {
+	if h.c != nil {
+		h.c.Close()
+	}
+	return nil
+}
+
+func (h *SocketHandler) connect() error {
+	if h.c != nil {
+		return nil
+	}
+
+	var err error
+	h.c, err = net.DialTimeout(h.protocol, h.addr, 20*time.Second)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}