From f645c42eb3629a402fcd878899f622011d8a9b24 Mon Sep 17 00:00:00 2001
From: Stephen McQuay <stephen@mcquay.me>
Date: Sun, 9 Mar 2014 23:58:56 -0700
Subject: [PATCH] Added encoding negociation step into protocol.

This is the first step involved in letting go clients talk gob to the game
server.

Still missing: actually use the client's prefered encoding
---
 protocol.go | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/protocol.go b/protocol.go
index 4e76d92..959b4df 100644
--- a/protocol.go
+++ b/protocol.go
@@ -200,11 +200,36 @@ func addPlayer(ws *websocket.Conn) {
 		return
 	}
 
-	gameParam := game.gameParam()
-	err = websocket.JSON.Send(ws, gameParam)
+	err = websocket.JSON.Send(ws,
+		[]string{"json", "jsonz", "gob"},
+	)
 	if err != nil {
-		log.Printf("%s %s game param parse error", gid.Id, player_id)
-		websocket.JSON.Send(ws, NewFailure("game param parse error"))
+		log.Printf("%s %s unable to send supported encodings msg", gid.Id, player_id)
+		websocket.JSON.Send(ws, NewFailure("encoding send error"))
+		return
+	}
+	var encoding string
+	err = websocket.JSON.Receive(ws, &encoding)
+	if err != nil {
+		log.Printf("%s %s unable to parse encoding", gid.Id, player_id)
+		websocket.JSON.Send(ws, NewFailure("encoding recieve error"))
+		return
+	}
+	log.Printf("negociated encoding: %s", encoding)
+	// TODO: use this negociated encoding
+
+	gameParam := game.gameParam()
+	gp := struct {
+		GameParam
+		Encoding string `json:"encoding"`
+	}{
+		GameParam: *gameParam,
+		Encoding:  encoding,
+	}
+	err = websocket.JSON.Send(ws, gp)
+	if err != nil {
+		log.Printf("%s %s game param send error", gid.Id, player_id)
+		websocket.JSON.Send(ws, NewFailure("game param send error"))
 		return
 	} else {
 		log.Printf("%s -> %s: sent %+v", gid.Id, player_id, gameParam)