[1.0.4] cocos2dx socketIO - Migrating from 0.9 issue

[ghost]

handshaking issue

I can't find handshake url

0.9 under - http://uri/socket.io/1
1.0.4 - http://uri/socket.io/?EIO=2&transport=polling <----- ??
I just found with packet sniffer

it returns sid and pinginterval timeout with http response code 200
but return value has binary data beginning of value <--- just right?

i don't know exactly what this value is correct.

and then I want connect to websocket but can't find any documents for version 1.0.4

where i connect to?

[hden]

Here: https://github.com/Automattic/engine.io-protocol#urls

Replacement of engine.io/ with socket.io/ take place in here

[ghost]

@hden
I can't find. poor document
where i connect to websocket server
any examples?

[hden]

Try GET http://HOST:PORT/socket.io/?EIO=3&transport=polling&b64=0

response 200

97:0{"sid":"ZDKctOVp2IY4hwXjAAAA","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":60000}

The b64 flag specifies base64 encoding

To perform further action, try GET http://HOST:PORT/socket.io/?EIO=3&transport=polling&b64=0&sid=ZDKctOVp2IY4hwXjAAAA

response 200

2:40

[ghost]

I tried like below

request

http://HOST:PORT/socket.io/?EIO=3&transport=polling&b64=0

response

97:0{"sid":"ZDKctOVp2IY4hwXjAAAA","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":60000}

and transport websocket using sid(session key)

request

http://HOST:PORT/socket.io/?EIO=3&transport=websocket&b64=0&sid=ZDKctOVp2IY4hwXjAAAA

response

{"code":3,"message":"Bad request"}

In 0.9 version of socket.io, websocket url was

http://HOST:PORT/socket.io/1/websocket

In 1.0.4 version, where I connect to?

[hden]

Please do a transport upgrade

Corresponding JavaScript code

[ajslater]

But there is no way for legacy clients, say... deployed mobile clients to connect with websockets first to a 1.0 socket.io server?

[hden]

Nope according to the spec. Legacy clients does not have corresponding parser in the first place.

[ghost]

thanks @hden
how to send upgrade transport?
is it mean ping pong?

To perform further action, try GET http://HOST:PORT/socket.io/?EIO=3&transport=polling&b64=0&sid=ZDKctOVp2IY4hwXjAAAA

response 200 
2:40

and what means 2:40 ?

[hden]

It's a engine.io payload [{length: 2, type: 4, data:'0'}], please see the spec for detail.

Official JavaScript implementation can be found here.

[ghost]

thanks i'll see them too

i'm modifying cocos2d-x source socketIO.cpp

i changed this line

pre << "http://" << _uri << "/socket.io/1";

to

pre << "http://" << _uri << "/socket.io/?EIO=2&transport=polling&b64=0";

like this.

and this block

to

    std::string res = s.str();
    std::string sid;
    int pos = 0;

    // sid
    const char* sid_key = "\"sid\":";
    pos = res.find(sid_key);
    if (pos > 0)
        res.erase(0, pos + strlen(sid_key)+1);
    pos = res.find("\"");
    if (pos > 0)
        _sid = res.substr(0, pos);

    // interval
    res = s.str();
    const char* interval_key = "\"pingInterval\":";
    pos = res.find(interval_key);
    if (pos > 0)
        res.erase(0, pos + strlen(interval_key));
    pos = res.find(",");
    pos = MIN(pos, res.find("}"));
    if (pos > 0 )
        _heartbeat = atoi(res.substr(0, pos).c_str()) / 1000;

    // timeout
    res = s.str();
    const char* timeout_key = "\"pingTimeout\":";
    pos = res.find(timeout_key);
    if (pos > 0)
        res.erase(0, pos + strlen(timeout_key));
    pos = res.find(",");
    pos = MIN(pos, res.find("}"));
    if (pos > 0 )
        _timeout = atoi(res.substr(0, pos).c_str()) / 1000;

for updated version.

this block parses 97:0{"sid":"ZDKctOVp2IY4hwXjAAAA","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":60000}

so then handshake is done.

next call opensocket function

In last version of socket.io

openSocket URL

url was /socket.io/1/websocket

help to change this line

I tried s << _uri << "/socket.io/?EIO=3&transport=websocket&sid=" << _sid;

but it returns error

according to engine.io README document

it may needs to a upgrade transport

README engine.io

how to upgrade transport?

thanks

[hden]

upgrade packet. corresponding code
probe packet. corresponding code

[man2]

is there any update on this? is it solved yet? really need this for my game :(

[lee-nk]

I'm just starting to look at this, and having the same issues. Some of the problems addressed above are just json parsing problems. Maybe Cocos2d-x would benefit from am integrated json parser.

[man2]

there is a library in %cocos2d-x-root%/external/json. maybe you could try to look at that

[fpanettieri]

I'm writting a Unity-Socket.IO plugin so I've been working with the message parsing.

What I've found is that the first digit matches an Engine.IO packet type id. (https://github.com/automattic/engine.io-protocol#packet)

The second digit it's the Socket.IO packet ID.

Using this rule, a packet "40" actually means
4: Engine.IO message
0: Socket.IO connect

Edit:
You can check the encoder & decoder classes on this repository
(https://github.com/fpanettieri/unity-socket.io/tree/master/SocketIO/Scripts/SocketIO)

[okelot]

is there any solution for connection to Socket.io version 1 from cocos2d-x?

[lee-nk]

FYI there has been discussion of this subject on the Cocos2d-x forum, including a response from Chris Hannon, the author of the SIOClient class:

http://discuss.cocos2d-x.org/t/sioclient-bug-found-in-emit-function/15526

[darrachequesne]

Closed due to inactivity, please reopen if needed.