I talked quickly about APE in a recent post. I recently downloaded a new version of their program and

I’ve installed it successfully and it works much better. Since the first released verison, it has become quite easy, you just have to launch “./build.sh”. I had some problems with the linker on my CentOS system and the mysql libraries. But I solved it by added “-L/var/lib64/mysql” to some line of the Makefile.

How to make the demos work

They are some tiny bugs that took me quite some time to bypass :

• To use the controller demo, you need to put the modules/conf/inlinepush.conf file into bin. I guess this will be fixed someday soon but still, that’s how it works right now.
• To use the move demo, you need to change the scripts/main.ape.js file and add this line :

include("examples/move.js");

• To use the TCPSocket demo, you need to copy the modules/conf/proxy.conf file into bin.

Note : Each time you modify a script file (within the “scripts” directoy of APE), you have to restart the server.

The very interesting javascript backend

This project is very interesting because everything in the backend is handled by some little javascript files, the move example file is this one :

Ape.registerCmd('setpos', true, function(params, infos) {
if ((!$defined(params.x) || !$defined(params.y)) && (!isFinite(params.x) || !isFinite(params.y))) return ;

infos.user.setProperty('x', params.x);
infos.user.setProperty('y', params.y);

// We get the channel
var chan = Ape.getChannelByPubid(params.pipe);

// And send the position data of the calling user on it
if (chan) {
chan.pipe.sendRaw('positions', {'x': params.x, 'y': params.y}, {'from': infos.user.pipe});
} else {
return ['109', 'UNKNOWN_PIPE'];
}

return 1;
});


This is what allows the client to send this kind of request :

[
{
"cmd": "SETPOS",
"chl": 10,
"params": {
"x": 282,
"y": 38,
"pipe": "3dcaa701e8ee3394d65d5f71cd18e428"
},
"sessid": "b897476d835d12c150fb9fc337c7c93d"
}
]


If you don’t add the include line, the answer will be something like that :

[
{
"time": "1260123358",
"raw": "ERR",
"data": {
"chl": 10,
"code": "003",
}
}
]


The “BAD_CMD” reply means that this commands hasn’t be registered by the Ape.registerCmd method. If you come here because that happened to you, just fix it.

For the Controller demo, this is exactly the same. The file is :

Ape.registerCmd("inlinepush", false, function(params, infos) {
// If every request parameters have been correctly defined
if ($defined(params.channel) &&$defined(params.data) && $defined(params.raw)) { // We get the channel var chan = Ape.getChannelByName(params.channel); if (!$defined(chan)) return ["401", "UNKNOWN_CHANNEL"];

// We send the data (as received) back to the channel
chan.pipe.sendRaw(params.raw, params.data);

return {"name":"pushed","data":{"value":"ok"}};
} else {
return ;
}
} else {
}
});


return ["400", "BAD_PASSWORD, the right one is :"+Ape.config("inlinepush.conf", "password")];


If you get “BAD_PASSWORD, the right one is :“. There’s a good chance you didn’t move the inlinepush.conf into the bin directory.

Sample communications

Here is a sample chat communication:

Echange CHAT :
--> [{"cmd":"script","params":{"domain":"ape.webingenia.com","scripts":["http://ape.webingenia.com/Source/mootools-core.js","http://ape.webingenia.com/Source/Core/APE.js","http://ape.webingenia.com/Source/Core/Events.js","http://ape.webingenia.com/Source/Core/Core.js","http://ape.webingenia.com/Source/Pipe/Pipe.js","http://ape.webingenia.com/Source/Pipe/PipeProxy.js","http://ape.webingenia.com/Source/Pipe/PipeMulti.js","http://ape.webingenia.com/Source/Pipe/PipeSingle.js","http://ape.webingenia.com/Source/Request/Request.js","http://ape.webingenia.com/Source/Request/Request.Stack.js","http://ape.webingenia.com/Source/Request/Request.CycledStack.js","http://ape.webingenia.com/Source/Transport/Transport.longPolling.js","http://ape.webingenia.com/Source/Transport/Transport.SSE.js","http://ape.webingenia.com/Source/Transport/Transport.XHRStreaming.js","http://ape.webingenia.com/Source/Transport/Transport.JSONP.js","http://ape.webingenia.com/Source/Core/Utility.js","http://ape.webingenia.com/Source/Core/JSON.js","http://ape.webingenia.com/Source/Core/Session.js"]}}]
<-- (useless html response)

// We  try some "CONNECT" and then "JOIN" commands with the name "superfc"
--> [{"cmd":"CONNECT","chl":1,"params":{"name":"superfc"}},{"cmd":"JOIN","chl":2,"params":{"channels":"test"}}]
// Error, the nick name is already use
<-- [{"time":"1260119123","raw":"ERR","data":{"code":"005","value":"NICK_USED"}}]

// We  try some "CONNECT" and then "JOIN" commands with the name "Florent"
--> [{"cmd":"CONNECT","chl":5,"params":{"name":"Hello"}},{"cmd":"JOIN","chl":6,"params":{"channels":"test"}}]
// This works !
{"time":"1260119134","raw":"IDENT","data":{"user":{"casttype":"uni","pubid":"8b5fec5af11df915d9806a3be4b46c35","properties":{"name":"Hello"}}}},
{"time":"1260119134","raw":"CHANNEL","data":{"users":[{"casttype":"uni","pubid":"8b5fec5af11df915d9806a3be4b46c35","properties":{"name":"Hello"},"level":1},{"casttype":"uni","pubid":"cc03a08f304a75cc133827c6c4b561c8","properties":{"name":"superfc"},"level":1},{"casttype":"uni","pubid":"541e78a0fbfbc08457c800aacccd212d","properties":{"name":"Florent"},"level":1}],"pipe":{"casttype":"multi","pubid":"2b27244bdb42c193d5158e818ec577d0","properties":{"name":"test"}}}}]

// We send
--> [{"cmd":"SESSION","chl":7,"params":{"action":"set","values":{"currentPipe":"2b27244bdb42c193d5158e818ec577d0"}},"sessid":"36a60d006d50882d0d2cd6bcfda90cb9"}]
<-- [{"time":"1260119136","raw":"LEFT","data":{"user":{"casttype":"uni","pubid":"cc03a08f304a75cc133827c6c4b561c8","properties":{"name":"superfc"}},"pipe":{"casttype":"multi","pubid":"2b27244bdb42c193d5158e818ec577d0","properties":{"name":"test"}}}}]

// These next requests are long polls with nothing
--> [{"cmd":"CHECK","chl":9,"sessid":"36a60d006d50882d0d2cd6bcfda90cb9"}]

// Nothing new
<-- [{"time":"1260119186","raw":"CLOSE","data":{"value":"null"}}]

--> [{"cmd":"CHECK","chl":10,"sessid":"36a60d006d50882d0d2cd6bcfda90cb9"}]
<-- [{"time":"1260119211","raw":"CLOSE","data":{"value":"null"}}]

--> [{"cmd":"CHECK","chl":11,"sessid":"36a60d006d50882d0d2cd6bcfda90cb9"}]
<-- [{"time":"1260119239","raw":"CLOSE","data":{"value":"null"}}]

// We send some text ("hello")
--> [{"cmd":"SEND","chl":19,"params":{"msg":"Hello hello","pipe":"2b27244bdb42c193d5158e818ec577d0"},"sessid":"36a60d006d50882d0d2cd6bcfda90cb9"}]
// And we receive it ("hello")
<-- [{"time":"1260119399","raw":"DATA","data":{"msg":"hello","from":{"casttype":"uni","pubid":"541e78a0fbfbc08457c800aacccd212d","properties":{"name":"Florent"}},"pipe":{"casttype":"multi","pubid":"2b27244bdb42c193d5158e818ec577d0","properties":{"name":"test"}}}}]


If you don’t understand what is long polling, please look at previous post on the subject.

Please not that that the “CLOSE” RAW isn’t some sort of “session closed” message. I’m not sure this it’s what the developer planned but right now it only means that there’s nothing to receive. So if you get that, don’t panic. Everything is working fine.