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% ==========================================================================================================
% MISULTIN - Example: Shows misultin Websocket With an event support.
%
% >-|-|-(°>
%
% Copyright (C) 2011, Roberto Ostinelli <roberto@ostinelli.net>
% All rights reserved.
%
% BSD License
%
% Redistribution and use in source and binary forms, with or without modification, are permitted provided
% that the following conditions are met:
%
% * Redistributions of source code must retain the above copyright notice, this list of conditions and the
% following disclaimer.
% * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
% the following disclaimer in the documentation and/or other materials provided with the distribution.
% * Neither the name of the authors nor the names of its contributors may be used to endorse or promote
% products derived from this software without specific prior written permission.
%
% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
% WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
% PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
% ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
% TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
% HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
% NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
% POSSIBILITY OF SUCH DAMAGE.
% ==========================================================================================================
-module(misultin_websocket_event_example).
-export([start/1, stop/0]).
% start misultin http server
start(Port) ->
misultin:start_link([
{port, Port}, {loop, fun(Req) -> handle_http(Req, Port) end},
{ws_loop, fun(Ws) -> handle_websocket(Ws) end}, {ws_autoexit, false}
]).
% stop misultin
stop() ->
misultin:stop().
% callback on request received
handle_http(Req, Port) ->
% output
Req:ok([{"Content-Type", "text/html"}],
["
<html>
<head>
<script type=\"text/javascript\">
function addStatus(text){
var date = new Date();
document.getElementById('status').innerHTML = document.getElementById('status').innerHTML + date + \": \" + text + \"<br>\";
}
function ready(){
var ws;
if (\"WebSocket\" in window) {
ws = new WebSocket(\"ws://localhost:", erlang:integer_to_list(Port) ,"/service\");
} else if (\"MozWebSocket\" in window) {
ws = new MozWebSocket(\"ws://localhost:", erlang:integer_to_list(Port) ,"/service\");
}
if (ws) {
// browser supports websockets
ws.onopen = function() {
// websocket is connected
addStatus(\"websocket connected!\");
// send hello data to server.
ws.send(\"hello server!\");
addStatus(\"sent message to server: 'hello server'!\");
};
ws.onmessage = function (evt) {
var receivedMsg = evt.data;
addStatus(\"server sent the following: '\" + receivedMsg + \"'\");
};
ws.onclose = function() {
// websocket was closed
addStatus(\"websocket was closed\");
};
} else {
// browser does not support websockets
addStatus(\"sorry, your browser does not support websockets.\");
}
}
</script>
</head>
<body onload=\"ready();\">
<div id=\"status\"></div>
</body>
</html>"]).
% callback on received websockets data
handle_websocket(Ws) ->
receive
{browser, Data} ->
Ws:send(["received '", Data, "'"]),
handle_websocket(Ws);
closed ->
% IMPORTANT: since we specified the {ws_autoexit, false} option, we need to manually ensure that this process exits
% [otherwise it will become a zombie]
io:format("The WebSocket was CLOSED!~n");
_Ignore ->
handle_websocket(Ws)
after 5000 ->
Ws:send("pushing!"),
handle_websocket(Ws)
end.
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