The Tor Browser: testing/mochitest/pywebsocket/mod_pywebsocket/__init_

testing/mochitest/pywebsocket/mod_pywebsocket/init.py@b8a032363ba2 (annotated)

testing/mochitest/pywebsocket/mod_pywebsocket/init.py

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

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 """WebSocket extension for Apache HTTP Server.
 mod_pywebsocket is a WebSocket extension for Apache HTTP Server
 intended for testing or experimental purposes. mod_python is required.
 Installation:
 . Prepare an Apache HTTP Server for which mod_python is enabled.
 . Specify the following Apache HTTP Server directives to suit your
    configuration.
    If mod_pywebsocket is not in the Python path, specify the following.
    <websock_lib> is the directory where mod_pywebsocket is installed.
        PythonPath "sys.path+['<websock_lib>']"
    Always specify the following. <websock_handlers> is the directory where
    user-written WebSocket handlers are placed.
        PythonOption mod_pywebsocket.handler_root <websock_handlers>
        PythonHeaderParserHandler mod_pywebsocket.headerparserhandler
    To limit the search for WebSocket handlers to a directory <scan_dir>
    under <websock_handlers>, configure as follows:
        PythonOption mod_pywebsocket.handler_scan <scan_dir>
    <scan_dir> is useful in saving scan time when <websock_handlers>
    contains many non-WebSocket handler files.
    If you want to support old handshake based on
    draft-hixie-thewebsocketprotocol-75:
        PythonOption mod_pywebsocket.allow_draft75 On
    If you want to allow handlers whose canonical path is not under the root
    directory (i.e. symbolic link is in root directory but its target is not),
    configure as follows:
        PythonOption mod_pywebsocket.allow_handlers_outside_root_dir On
    Example snippet of httpd.conf:
    (mod_pywebsocket is in /websock_lib, WebSocket handlers are in
    /websock_handlers, port is 80 for ws, 443 for wss.)
        <IfModule python_module>
          PythonPath "sys.path+['/websock_lib']"
          PythonOption mod_pywebsocket.handler_root /websock_handlers
          PythonHeaderParserHandler mod_pywebsocket.headerparserhandler
        </IfModule>
 . Tune Apache parameters for serving WebSocket. We'd like to note that at
    least TimeOut directive from core features and RequestReadTimeout
    directive from mod_reqtimeout should be modified not to kill connections
    in only a few seconds of idle time.
 . Verify installation. You can use example/console.html to poke the server.
 Writing WebSocket handlers:
 When a WebSocket request comes in, the resource name
 specified in the handshake is considered as if it is a file path under
 <websock_handlers> and the handler defined in
 <websock_handlers>/<resource_name>_wsh.py is invoked.
 For example, if the resource name is /example/chat, the handler defined in
 <websock_handlers>/example/chat_wsh.py is invoked.
 A WebSocket handler is composed of the following three functions:
     web_socket_do_extra_handshake(request)
     web_socket_transfer_data(request)
     web_socket_passive_closing_handshake(request)
 where:
     request: mod_python request.
 web_socket_do_extra_handshake is called during the handshake after the
 headers are successfully parsed and WebSocket properties (ws_location,
 ws_origin, and ws_resource) are added to request. A handler
 can reject the request by raising an exception.
 A request object has the following properties that you can use during the
 extra handshake (web_socket_do_extra_handshake):
 - ws_resource
 - ws_origin
 - ws_version
 - ws_location (Hixie 75 and HyBi 00 only)
 - ws_extensions (Hybi 06 and later)
 - ws_deflate (HyBi 06 and later)
 - ws_protocol
 - ws_requested_protocols (HyBi 06 and later)
 The last two are a bit tricky.
 For HyBi 06 and later, ws_protocol is always set to None when
 web_socket_do_extra_handshake is called. If ws_requested_protocols is not
 None, you must choose one subprotocol from this list and set it to
 ws_protocol.
 For Hixie 75 and HyBi 00, when web_socket_do_extra_handshake is called,
 ws_protocol is set to the value given by the client in
 Sec-WebSocket-Protocol (WebSocket-Protocol for Hixie 75) header or None if
 such header was not found in the opening handshake request. Finish extra
 handshake with ws_protocol untouched to accept the request subprotocol.
 Then, Sec-WebSocket-Protocol (or WebSocket-Protocol) header will be sent to
 the client in response with the same value as requested. Raise an exception
 in web_socket_do_extra_handshake to reject the requested subprotocol.
 web_socket_transfer_data is called after the handshake completed
 successfully. A handler can receive/send messages from/to the client
 using request. mod_pywebsocket.msgutil module provides utilities
 for data transfer.
 You can receive a message by the following statement.
     message = request.ws_stream.receive_message()
 This call blocks until any complete text frame arrives, and the payload data
 of the incoming frame will be stored into message. When you're using IETF
 HyBi 00 or later protocol, receive_message() will return None on receiving
 client-initiated closing handshake. When any error occurs, receive_message()
 will raise some exception.
 You can send a message by the following statement.
     request.ws_stream.send_message(message)
 Executing the following statement or just return-ing from
 web_socket_transfer_data cause connection close.
     request.ws_stream.close_connection()
 When you're using IETF HyBi 00 or later protocol, close_connection will wait
 for closing handshake acknowledgement coming from the client. When it
 couldn't receive a valid acknowledgement, raises an exception.
 web_socket_passive_closing_handshake is called after the server receives
 incoming closing frame from the client peer immediately. You can specify
 code and reason by return values. They are sent as a outgoing closing frame
 from the server. A request object has the following properties that you can
 use in web_socket_passive_closing_handshake.
 - ws_close_code
 - ws_close_reason
 A WebSocket handler must be thread-safe if the server (Apache or
 standalone.py) is configured to use threads.
 """
 # vi:sts=4 sw=4 et tw=72

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testing/mochitest/pywebsocket/mod_pywebsocket/__init__.py@b8a032363ba2 (annotated)

testing/mochitest/pywebsocket/mod_pywebsocket/__init__.py

testing/mochitest/pywebsocket/mod_pywebsocket/init.py@b8a032363ba2 (annotated)

testing/mochitest/pywebsocket/mod_pywebsocket/init.py