Move version to const and expose via Version()

whisper/whisper.go

@@ -18,6 +18,7 @@ import (
 const (
 	statusMsg      = 0x0
 	envelopesMsg   = 0x01
+	whisperVersion = 0x02
 )
 
 type MessageEvent struct {
@@ -56,7 +57,7 @@ func New() *Whisper {
 	// p2p whisper sub protocol handler
 	whisper.protocol = p2p.Protocol{
 		Name:    "shh",
-		Version: 2,
+		Version: uint(whisperVersion),
 		Length:  2,
 		Run:     whisper.msgHandler,
 	}
@@ -64,6 +65,10 @@ func New() *Whisper {
 	return whisper
 }
 
+func (self *Whisper) Version() uint {
+	return self.protocol.Version
+}
+
 func (self *Whisper) Start() {
 	wlogger.Infoln("Whisper started")
 	go self.update()