ws2s: ws2s(websocket to socket)让运行在浏览器上的js，能使用socket来通信。

## ws2s--bring socket to browser-side js
ws2s(websocket to socket) is a websocket server that handle socket(tcp)s.

![](https://playlay.github.io/images/ws2s.png)

the simplest workflow might be like this:

first, a websocket client(we called **`"ws"`**) ask ws2s_server to create a socket(we called **`"s"`**) for it.    
then, **`"ws"`** ask ws2s_server to use **`"s"`** to send data.    
when **`"s"`** received data, ws2s_server will notify **`"ws"`** with the received data.

with this workflow, javaScript running on a browser got the ability to use socket.

## client case
a ws2s server at `wss://feling.io/ws2s-server/` is ready for test case.     
an online redis gui client powered by ws2s is provided at [fredis](https://feling.io/redis/).

### use origin javaScript
```javaScript
var ws = new WebSocket("wss://feling.io/ws2s-server/")
ws.onmessage = (event) => {
    console.log("onmessage: ", event.data)
}
ws.onopen = () => {
    console.log("onopen")
    ws.send(JSON.stringify(
        {
            command: "connect",
            host: "feling.io",
            port: 80
        }
    ))
    ws.send(JSON.stringify(
        {
            command: "send",
            data: "GET / HTTP/1.1\r\nHost: feling.io\r\nConnection: close\r\n\r\n"
        }
    ))
}
ws.onclose = () => {
    console.log("onclose")
}
```

### use [ws2s.js](ws2s-js/)
```javaScript
var socket = new WS2S("wss://feling.io/ws2s-server/").newSocket()

$('#connect-button').bind("click", () => {
    socket.connect("feling.io", 80)
})

$('#send-button').bind("click",  () => {
    socket.send("GET / HTTP/1.1\r\nHost: feling.io\r\nConnection: close\r\n\r\n")
})

socket.onRecv = (data) => {
    console.log('onRecv', data)
}
```

## install
ws2s works on py2、py3、Linux、OSX. I tried to support Windows, but there is too much adaptation to be handled for Windows.

It is recommended to install from github:    
```shell
pip install git+https://github.com/playlay/ws2s --upgrade
```

you can also install ws2s from pypi:    
```shell
pip install ws2s-python --upgrade
```

after installed ws2s:     
`ws2sd` command can be used in shell,     
`~/.ws2s/` directory will be created when you exec `ws2sd`

## config
config file is store at `~/.ws2s/config.json`.

## protocol
### request
all kinds of requests are listed below:     
```json
{
    "command": "connect",
    "host":"127.0.0.1",
    "port":80
}
{
    "command": "send",
    "data":"GET / HTTP/1.1\r\nHost: 127.0.0.1\r\nConnection: close\r\n\r\n"
}
{
    "command": "close"
}
```
you can find out that:

1. message(we called request) send to ws2s_sever is a json format string.   
2. a "command" field is required

### response
message(we called response) received from ws2s_sever, is a json format string too:      
```json
{
    "success": true,
    "code": -1,
    "message": "recv data",
    "data": []
}
```
```
As the example above:    
- "message" field is for human.   
- "success" field can be ignored.

when "code" field = -1, "data" field is presented.     
    that means ws2s_server received data from peer. "data" is a int array, each element represents a byte.

when "code" field = 0.      
    usually means ws2s_server successfully completed the most recent command

when "code" field > 0.      
    means something is not normal:      
    when "code" = 1:    
        unknown exception, you can submit an issue to ws2s

when "code" = 2:    
        ConnectionRefusedError raisesd when ws2s_server try to   
        connect host:port you specified

when "code" = 3:    
        IllegalSocketState, just reSend an "connect" request like:    
        {"command":"connect","host":"127.0.0.1","port":80}

when "code" = 4:    
        usually means you want ws2s_server to connect 127.0.0.1,    
        but ws2s_server refused to do that     
    
    when "code" = 5:    
        socket connection closed by socket server you connected to
```

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