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  • WebSocket client for python

    Project description

    websocket-client module is WebSocket client for python. This provide the low level APIs for WebSocket. All APIs are the synchronous functions.

    websocket-client supports only hybi-13.

    License

    • LGPL

    Installation

    This module is tested on Python 2.7 and Python 3.4+.

    Type “python setup.py install” or “pip install websocket-client” to install.

    Caution!

    from v0.16.0, we can install by “pip install websocket-client” for Python 3.

    This module depends on

    • six
    • backports.ssl_match_hostname for Python 2.x

    performance

    “send” method is too slow on pure python. If you want to get better performace, please install numpy or wsaccel. You can get the best performance from numpy.

    How about Python 3

    Now, we support Python 3 on single source code from version 0.14.0. Thanks, @battlemidget and @ralphbean.

    HTTP Proxy

    Support websocket access via http proxy. The proxy server must allow “CONNECT” method to websocket port. Default squid setting is “ALLOWED TO CONNECT ONLY HTTPS PORT”.

    Current implementation of websocket-client is using “CONNECT” method via proxy.

    example

    import websocket
    ws = websocket.WebSocket()
    ws.connect("ws://example.com/websocket", http_proxy_host="proxy_host_name", http_proxy_port=3128)
    

    Examples

    Long-lived connection

    This example is similar to how WebSocket code looks in browsers using JavaScript.

    import websocket
    try:
        import thread
    except ImportError:
        import _thread as thread
    import time
    
    def on_message(ws, message):
        print(message)
    
    def on_error(ws, error):
        print(error)
    
    def on_close(ws):
        print("### closed ###")
    
    def on_open(ws):
        def run(*args):
            for i in range(3):
                time.sleep(1)
                ws.send("Hello %d" % i)
            time.sleep(1)
            ws.close()
            print("thread terminating...")
        thread.start_new_thread(run, ())
    
    
    if __name__ == "__main__":
        websocket.enableTrace(True)
        ws = websocket.WebSocketApp("ws://echo.websocket.org/",
                                  on_message = on_message,
                                  on_error = on_error,
                                  on_close = on_close)
        ws.on_open = on_open
        ws.run_forever()

    Short-lived one-off send-receive

    This is if you want to communicate a short message and disconnect immediately when done.

    from websocket import create_connection
    ws = create_connection("ws://echo.websocket.org/")
    print("Sending 'Hello, World'...")
    ws.send("Hello, World")
    print("Sent")
    print("Receiving...")
    result =  ws.recv()
    print("Received '%s'" % result)
    ws.close()

    If you want to customize socket options, set sockopt.

    sockopt example

    from websocket import create_connection
    ws = create_connection("ws://echo.websocket.org/",
                            sockopt=((socket.IPPROTO_TCP, socket.TCP_NODELAY),))

    More advanced: Custom class

    You can also write your own class for the connection, if you want to handle the nitty-gritty details yourself.

    import socket
    from websocket import create_connection, WebSocket
    class MyWebSocket(WebSocket):
        def recv_frame(self):
            frame = super().recv_frame()
            print('yay! I got this frame: ', frame)
            return frame
    
    ws = create_connection("ws://echo.websocket.org/",
                            sockopt=((socket.IPPROTO_TCP, socket.TCP_NODELAY, 1),), class_=MyWebSocket)

    FAQ

    How to disable ssl cert verification?

    Please set sslopt to {“cert_reqs”: ssl.CERT_NONE}.

    WebSocketApp sample

    ws = websocket.WebSocketApp("wss://echo.websocket.org")
    ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})

    create_connection sample

    ws = websocket.create_connection("wss://echo.websocket.org",
      sslopt={"cert_reqs": ssl.CERT_NONE})

    WebSocket sample

    ws = websocket.WebSocket(sslopt={"cert_reqs": ssl.CERT_NONE})
    ws.connect("wss://echo.websocket.org")

    How to disable hostname verification.

    Please set sslopt to {“check_hostname”: False}. (since v0.18.0)

    WebSocketApp sample

    ws = websocket.WebSocketApp("wss://echo.websocket.org")
    ws.run_forever(sslopt={"check_hostname": False})

    create_connection sample

    ws = websocket.create_connection("wss://echo.websocket.org",
      sslopt={"check_hostname": False})

    WebSocket sample

    ws = websocket.WebSocket(sslopt={"check_hostname": False})
    ws.connect("wss://echo.websocket.org")

    How to enable SNI?

    SNI support is available for Python 2.7.9+ and 3.2+. It will be enabled automatically whenever possible.

    Sub Protocols.

    The server needs to support sub protocols, please set the subprotocol like this.

    Subprotocol sample

    ws = websocket.create_connection("ws://example.com/websocket", subprotocols=["binary", "base64"])

    wsdump.py

    wsdump.py is simple WebSocket test(debug) tool.

    sample for echo.websocket.org:

    $ wsdump.py ws://echo.websocket.org/
    Press Ctrl+C to quit
    > Hello, WebSocket
    < Hello, WebSocket
    > How are you?
    < How are you?
    

    Usage

    usage:

    wsdump.py [-h] [-v [VERBOSE]] ws_url
    

    WebSocket Simple Dump Tool

    positional arguments:
    ws_url websocket url. ex. ws://echo.websocket.org/
    optional arguments:
    -h, --help show this help message and exit
    WebSocketApp
    -v VERBOSE--verbose VERBOSE
      set verbose mode. If set to 1, show opcode. If set to 2, enable to trace websocket module

    example:

    $ wsdump.py ws://echo.websocket.org/
    $ wsdump.py ws://echo.websocket.org/ -v
    $ wsdump.py ws://echo.websocket.org/ -vv
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  • 原文地址:https://www.cnblogs.com/bitquant/p/python-websocket.html
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