From dfd11c94c1ad5261caa43128a39fcce550edf61d Mon Sep 17 00:00:00 2001
From: Kevin Chabowski <kevin@kch42.de>
Date: Thu, 27 Mar 2014 12:28:05 +0100
Subject: Chat now works on the client side

---
 chat/messages.go |   2 +-
 pages.go         |   6 ++--
 static/chat.js   | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 static/style.css |  26 +++++++++++++++
 tpls/chat.html   |  16 +++++++--
 websock.go       |  15 +++++++--
 6 files changed, 156 insertions(+), 9 deletions(-)
 create mode 100644 static/chat.js
 create mode 100644 static/style.css

diff --git a/chat/messages.go b/chat/messages.go
index dbcd150..eed62fa 100644
--- a/chat/messages.go
+++ b/chat/messages.go
@@ -26,7 +26,7 @@ func (mt MsgType) String() string {
 	return "???"
 }
 
-func (mt *MsgType) MarshalJSON() ([]byte, error) {
+func (mt MsgType) MarshalJSON() ([]byte, error) {
 	return json.Marshal(mt.String())
 }
 
diff --git a/pages.go b/pages.go
index 40c2c21..886f1d6 100644
--- a/pages.go
+++ b/pages.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"github.com/gorilla/mux"
 	"html/template"
 	"net/http"
 	"path"
@@ -11,7 +12,7 @@ var (
 )
 
 type ChatpageData struct {
-	Websock string
+	Websock, Roomname string
 }
 
 func PrepTemplates() {
@@ -24,5 +25,6 @@ func Home(rw http.ResponseWriter, req *http.Request) {
 }
 
 func Chatpage(rw http.ResponseWriter, req *http.Request) {
-	TplChat.Execute(rw, ChatpageData{"ws://" + req.Host + req.URL.Path + "socket"})
+	vars := mux.Vars(req)
+	TplChat.Execute(rw, ChatpageData{"ws://" + req.Host + req.URL.Path + "socket", vars["chatroom"]})
 }
diff --git a/static/chat.js b/static/chat.js
new file mode 100644
index 0000000..d9c89fe
--- /dev/null
+++ b/static/chat.js
@@ -0,0 +1,100 @@
+function askTryAgain(reason, ws_url) {
+	if(confirm("Could not join chat (Reason: "+ reason +"). Try again?")) {
+		window.setTimeout(RunChat, 1, ws_url); // We use a timeout, so we don't accidentally fill up the call stack.
+	}
+}
+
+function addBuddy(nick) {
+	var found = false;
+	$("#buddies li").each(function(index) {
+		if($(this).text() == nick) {
+			found = true;
+		}
+	});
+	if(!found) {
+		$("#buddies").append($("<li/>").text(nick));
+	}
+}
+
+function removeBuddy(nick) {
+	$("#buddies li").each(function(index) {
+		var self = $(this);
+		if(self.text() == nick) {
+			self.remove();
+		}
+	});
+}
+
+function chatlogWriter(event) {
+	var data = JSON.parse(event.data);
+	var msgtext = "";
+	switch(data.type) {
+	case "chat":
+		msgtext = data.text;
+		break;
+	case "join":
+		msgtext = "joined the room";
+		addBuddy(data.user);
+		break;
+	case "leave":
+		msgtext = "left the room";
+		removeBuddy(data.user);
+		break;
+	}
+	
+	var elemNick = $("<span/>").addClass("nick").text(data.user);
+	var elemText = $("<span/>").addClass("msg").text(msgtext);
+	var logentry = $("<li/>").addClass(data.type).append(elemNick).append(elemText);
+	$("#chatlog").append(logentry);
+	window.scrollTo(0, logentry.offset().top);
+}
+
+function initChatSender(ws) {
+	var send = function() {
+		var ct = $("#chattext")
+		ws.send(ct.prop("value"));
+		ct.prop("value","");
+		ct.focus();
+	};
+	
+	$("#sendbtn").click(send);
+	$("#chattext").keyup(function(event) {
+		if(event.keyCode==13) {
+			send();
+		}
+	});
+}
+
+function Join(ws_url, nick) {
+	var ws = new WebSocket(ws_url, "chat");
+	ws.onopen = function(_) {
+		ws.send(nick); 
+		ws.onmessage = function(event) {
+			var data = JSON.parse(event.data);
+			if(data.ok) {
+				ws.onmessage = chatlogWriter;
+				for(i in data.buddies) {
+					addBuddy(data.buddies[i]);
+				}
+				initChatSender(ws);
+				ws.onclose = function(_) {
+					alert("Connection lost. Try refreshing the page.");
+				};
+			} else {
+				ws.close();
+				askTryAgain(data.error, ws_url);
+			}
+		};
+	};
+}
+
+function RunChat(ws_url) {
+	var nick = "";
+	while(nick == "") {
+		nick = prompt("Choose a nickname");
+		if(nick === null) {
+			return;
+		}
+	}
+	Join(ws_url, nick);
+}
diff --git a/static/style.css b/static/style.css
new file mode 100644
index 0000000..00fe4a4
--- /dev/null
+++ b/static/style.css
@@ -0,0 +1,26 @@
+* {
+	font-family: sans-serif;
+}
+
+#chatlog {
+	display: table;
+	list-style: none;
+	margin: 0;
+	padding: 0
+}
+
+#chatlog li {
+	display: table-row;
+	margin: 0;
+	padding: 0;
+}
+
+#chatlog li .nick {
+	display: table-cell;
+	padding-right: 1ex;
+	font-weight: bold;
+}
+
+#chatlog li .msg {
+	display: table-cell;
+}
\ No newline at end of file
diff --git a/tpls/chat.html b/tpls/chat.html
index c107b49..27ad69f 100644
--- a/tpls/chat.html
+++ b/tpls/chat.html
@@ -1,9 +1,19 @@
 <!DOCTYPE html>
 <html>
 <head>
-	<title></title>
+	<title>{{.Roomname}}</title>
+	<script type="text/javascript" src="/static/jquery.min.js"></script>
+	<script type="text/javascript" src="/static/chat.js"></script>
+	<script type="text/javascript">$("document").ready(function(){RunChat("{{.Websock}}");});</script>
+	<link rel="stylesheet" type="text/css" href="/static/style.css" />
 </head>
 <body>
-{{ .Websock }}
+	<h1>{{.Roomname}}</h1>
+	<ul id="buddies"></ul>
+	<ul id="chatlog"></ul>
+	<div id="chatinput">
+		<input type="text" name="chattext" id="chattext"/>
+		<button id="sendbtn">Chat</button>
+	</div>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/websock.go b/websock.go
index bf4fabd..9734e65 100644
--- a/websock.go
+++ b/websock.go
@@ -43,11 +43,13 @@ func AcceptWebSock(rw http.ResponseWriter, req *http.Request) {
 			return
 		}
 
+		exit := make(chan struct{})
+
 		go func() {
 			var s string
 			for {
 				if websocket.Message.Receive(ws, &s) != nil {
-					return
+					break
 				}
 
 				if s == "" {
@@ -56,11 +58,18 @@ func AcceptWebSock(rw http.ResponseWriter, req *http.Request) {
 
 				buddy.Say(s)
 			}
+
+			exit <- struct{}{}
 		}()
 
-		for m := range buddy.Receive {
-			if send(m) != nil {
+		for {
+			select {
+			case <-exit:
 				return
+			case m := <-buddy.Receive:
+				if send(m) != nil {
+					return
+				}
 			}
 		}
 	}).ServeHTTP(rw, req)
-- 
cgit v1.2.3-70-g09d2