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Websockets example | ||
================== | ||
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$ rebar compile | ||
$ ./start.sh |
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%% Feel free to use, reuse and abuse the code in this file. | ||
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{application, websockets, [ | ||
{description, "Cowboy Websockets example."}, | ||
{vsn, "1"}, | ||
{modules, []}, | ||
{registered, []}, | ||
{applications, [ | ||
kernel, | ||
stdlib, | ||
cowboy | ||
]}, | ||
{mod, {websockets_app, []}}, | ||
{env, []} | ||
]}. |
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-module(websockets). | ||
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%% API. | ||
-export([start/0]). | ||
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%% API. | ||
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start() -> | ||
ok = application:start(ranch), | ||
ok = application:start(cowboy), | ||
ok = application:start(websockets). |
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%% @private | ||
-module(websockets_app). | ||
-behaviour(application). | ||
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%% API. | ||
-export([start/2]). | ||
-export([stop/1]). | ||
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%% API. | ||
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start(_Type, _Args) -> | ||
Dispatch = [ | ||
{'_', [ | ||
{[], websockets_handler, []} | ||
]} | ||
], | ||
{ok, _} = cowboy:start_http(http, 100, [{port, 8080}], [ | ||
{dispatch, Dispatch} | ||
]), | ||
websockets_sup:start_link(). | ||
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stop(_State) -> | ||
ok. |
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-module(websockets_handler). | ||
-behaviour(cowboy_http_handler). | ||
-behaviour(cowboy_websocket_handler). | ||
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-export([init/3, handle/2, terminate/2]). | ||
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-export([websocket_init/3, websocket_handle/3, | ||
websocket_info/3, websocket_terminate/3]). | ||
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init({_Any, http}, Req, []) -> | ||
case cowboy_req:header(<<"upgrade">>, Req) of | ||
{undefined, Req2} -> {ok, Req2, undefined}; | ||
{<<"websocket">>, _Req2} -> {upgrade, protocol, cowboy_websocket} | ||
end. | ||
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handle(Req, State) -> | ||
{ok, Req2} = cowboy_req:reply(200, [{<<"Content-Type">>, <<"text/html">>}], | ||
%% HTML code taken from misultin's example file. | ||
<<"<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(){ | ||
if (\"MozWebSocket\" in window) { | ||
WebSocket = MozWebSocket; | ||
} | ||
if (\"WebSocket\" in window) { | ||
// browser supports websockets | ||
var ws = new WebSocket( (window.location.protocol == 'http:' | ||
? 'ws://' : 'wss://') + | ||
window.location.host + '/'); | ||
ws.onopen = function() { | ||
// websocket is connected | ||
addStatus('websocket connected!'); | ||
// send hello data to server. | ||
var msg = 'hello hello hello what\\'s going on \\'ere then?'; | ||
ws.send(msg); | ||
addStatus('sent message to server: ' + msg); | ||
}; | ||
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=\"\"> | ||
Hi! | ||
<input type=\"button\" onclick=\"ready();\" value=\"click\"/> | ||
<div id=\"status\"></div> | ||
</body> | ||
</html>">>, Req), | ||
{ok, Req2, State}. | ||
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terminate(_Req, _State) -> | ||
ok. | ||
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websocket_init(_Any, Req, []) -> | ||
timer:send_interval(1000, tick), | ||
Req2 = cowboy_req:compact(Req), | ||
{ok, Req2, undefined, hibernate}. | ||
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websocket_handle({text, Msg}, Req, State) -> | ||
{reply, {text, << "You said: ", Msg/binary >>}, Req, State, hibernate}; | ||
websocket_handle(_Any, Req, State) -> | ||
{ok, Req, State}. | ||
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%% send some repeated text to show compression at work if anyone is counting | ||
websocket_info(tick, Req, State) -> | ||
{reply, {text, <<"badger badger badger badger badger badger badger">>}, Req, State, hibernate}; | ||
websocket_info(_Info, Req, State) -> | ||
{ok, Req, State, hibernate}. | ||
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websocket_terminate(_Reason, _Req, _State) -> | ||
ok. |
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%% @private | ||
-module(websockets_sup). | ||
-behaviour(supervisor). | ||
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%% API. | ||
-export([start_link/0]). | ||
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%% supervisor. | ||
-export([init/1]). | ||
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%% API. | ||
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-spec start_link() -> {ok, pid()}. | ||
start_link() -> | ||
supervisor:start_link({local, ?MODULE}, ?MODULE, []). | ||
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%% supervisor. | ||
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init([]) -> | ||
Procs = [], | ||
{ok, {{one_for_one, 10, 10}, Procs}}. |
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#!/bin/sh | ||
erl -pa ebin ../../ebin ../../deps/*/ebin -boot start_sasl -s websockets \ | ||
-eval "io:format(\"Point your browser at http://localhost:8080~n\")." |