Bugfix: Websocket ping/pong improvements (#406)

* Renames func. Creates new func to setup pinghander either via gorilla style or our own

* Cleans up all ping pong handlers.......

* Clears up issues, makes naming a bit better

* Adds tests

* Adds ping support to binance

* Cleans up ping pongs and adds a comment

* Cleans up waitgroup stuff.

* DISCREETLY cleans up woeful function

* Fixes Kraken ping message type. Removes unnecessary test property. Adds `if err == websocket.ErrCloseSent {` to ping func

* +1 for +v

exchanges/binance/binance_websocket.go

@@ -20,6 +20,7 @@ import (
 
 const (
 	binanceDefaultWebsocketURL = "wss://stream.binance.com:9443"
+	pingDelay                  = time.Minute * 9
 )
 
 // WsConnect intiates a websocket connection
@@ -71,7 +72,11 @@ func (b *Binance) WsConnect() error {
 			b.Name,
 			err)
 	}
-
+	b.WebsocketConn.SetupPingHandler(wshandler.WebsocketPingHandler{
+		UseGorillaHandler: true,
+		MessageType:       websocket.PongMessage,
+		Delay:             pingDelay,
+	})
 	go b.WsHandleData()
 
 	return nil