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513 lines
17 KiB
513 lines
17 KiB
"""
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websocket - WebSocket client library for Python
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Copyright (C) 2010 Hiroki Ohtani(liris)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1335 USA
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"""
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from __future__ import print_function
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import socket
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import struct
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import threading
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import time
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import six
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# websocket modules
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from ._abnf import *
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from ._exceptions import *
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from ._handshake import *
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from ._http import *
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from ._logging import *
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from ._socket import *
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from ._ssl_compat import *
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from ._utils import *
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__all__ = ['WebSocket', 'create_connection']
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"""
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websocket python client.
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=========================
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This version support only hybi-13.
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Please see http://tools.ietf.org/html/rfc6455 for protocol.
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"""
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class WebSocket(object):
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"""
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Low level WebSocket interface.
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This class is based on
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The WebSocket protocol draft-hixie-thewebsocketprotocol-76
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http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76
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We can connect to the websocket server and send/receive data.
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The following example is an echo client.
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>>> import websocket
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>>> ws = websocket.WebSocket()
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>>> ws.connect("ws://echo.websocket.org")
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>>> ws.send("Hello, Server")
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>>> ws.recv()
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'Hello, Server'
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>>> ws.close()
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get_mask_key: a callable to produce new mask keys, see the set_mask_key
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function's docstring for more details
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sockopt: values for socket.setsockopt.
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sockopt must be tuple and each element is argument of sock.setsockopt.
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sslopt: dict object for ssl socket option.
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fire_cont_frame: fire recv event for each cont frame. default is False
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enable_multithread: if set to True, lock send method.
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skip_utf8_validation: skip utf8 validation.
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"""
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def __init__(self, get_mask_key=None, sockopt=None, sslopt=None,
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fire_cont_frame=False, enable_multithread=False,
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skip_utf8_validation=False, **_):
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"""
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Initialize WebSocket object.
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"""
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self.sock_opt = sock_opt(sockopt, sslopt)
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self.handshake_response = None
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self.sock = None
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self.connected = False
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self.get_mask_key = get_mask_key
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# These buffer over the build-up of a single frame.
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self.frame_buffer = frame_buffer(self._recv, skip_utf8_validation)
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self.cont_frame = continuous_frame(
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fire_cont_frame, skip_utf8_validation)
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if enable_multithread:
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self.lock = threading.Lock()
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self.readlock = threading.Lock()
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else:
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self.lock = NoLock()
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self.readlock = NoLock()
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def __iter__(self):
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"""
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Allow iteration over websocket, implying sequential `recv` executions.
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"""
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while True:
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yield self.recv()
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def __next__(self):
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return self.recv()
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def next(self):
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return self.__next__()
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def fileno(self):
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return self.sock.fileno()
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def set_mask_key(self, func):
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"""
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set function to create musk key. You can customize mask key generator.
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Mainly, this is for testing purpose.
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func: callable object. the func takes 1 argument as integer.
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The argument means length of mask key.
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This func must return string(byte array),
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which length is argument specified.
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"""
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self.get_mask_key = func
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def gettimeout(self):
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"""
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Get the websocket timeout(second).
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"""
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return self.sock_opt.timeout
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def settimeout(self, timeout):
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"""
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Set the timeout to the websocket.
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timeout: timeout time(second).
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"""
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self.sock_opt.timeout = timeout
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if self.sock:
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self.sock.settimeout(timeout)
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timeout = property(gettimeout, settimeout)
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def getsubprotocol(self):
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"""
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get subprotocol
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"""
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if self.handshake_response:
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return self.handshake_response.subprotocol
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else:
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return None
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subprotocol = property(getsubprotocol)
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def getstatus(self):
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"""
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get handshake status
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"""
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if self.handshake_response:
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return self.handshake_response.status
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else:
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return None
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status = property(getstatus)
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def getheaders(self):
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"""
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get handshake response header
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"""
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if self.handshake_response:
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return self.handshake_response.headers
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else:
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return None
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def is_ssl(self):
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return isinstance(self.sock, ssl.SSLSocket)
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headers = property(getheaders)
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def connect(self, url, **options):
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"""
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Connect to url. url is websocket url scheme.
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ie. ws://host:port/resource
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You can customize using 'options'.
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If you set "header" list object, you can set your own custom header.
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>>> ws = WebSocket()
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>>> ws.connect("ws://echo.websocket.org/",
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... header=["User-Agent: MyProgram",
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... "x-custom: header"])
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timeout: socket timeout time. This value is integer.
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if you set None for this value,
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it means "use default_timeout value"
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options: "header" -> custom http header list or dict.
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"cookie" -> cookie value.
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"origin" -> custom origin url.
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"suppress_origin" -> suppress outputting origin header.
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"host" -> custom host header string.
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"http_proxy_host" - http proxy host name.
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"http_proxy_port" - http proxy port. If not set, set to 80.
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"http_no_proxy" - host names, which doesn't use proxy.
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"http_proxy_auth" - http proxy auth information.
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tuple of username and password.
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default is None
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"redirect_limit" -> number of redirects to follow.
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"subprotocols" - array of available sub protocols.
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default is None.
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"socket" - pre-initialized stream socket.
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"""
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self.sock, addrs = connect(url, self.sock_opt, proxy_info(**options),
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options.pop('socket', None))
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try:
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self.handshake_response = handshake(self.sock, *addrs, **options)
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for attempt in range(options.pop('redirect_limit', 3)):
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if self.handshake_response.status in SUPPORTED_REDIRECT_STATUSES:
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url = self.handshake_response.headers['location']
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self.sock.close()
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self.sock, addrs = connect(url, self.sock_opt, proxy_info(**options),
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options.pop('socket', None))
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self.handshake_response = handshake(self.sock, *addrs, **options)
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self.connected = True
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except:
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if self.sock:
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self.sock.close()
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self.sock = None
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raise
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def send(self, payload, opcode=ABNF.OPCODE_TEXT):
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"""
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Send the data as string.
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payload: Payload must be utf-8 string or unicode,
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if the opcode is OPCODE_TEXT.
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Otherwise, it must be string(byte array)
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opcode: operation code to send. Please see OPCODE_XXX.
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"""
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frame = ABNF.create_frame(payload, opcode)
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return self.send_frame(frame)
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def send_frame(self, frame):
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"""
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Send the data frame.
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frame: frame data created by ABNF.create_frame
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>>> ws = create_connection("ws://echo.websocket.org/")
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>>> frame = ABNF.create_frame("Hello", ABNF.OPCODE_TEXT)
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>>> ws.send_frame(frame)
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>>> cont_frame = ABNF.create_frame("My name is ", ABNF.OPCODE_CONT, 0)
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>>> ws.send_frame(frame)
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>>> cont_frame = ABNF.create_frame("Foo Bar", ABNF.OPCODE_CONT, 1)
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>>> ws.send_frame(frame)
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"""
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if self.get_mask_key:
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frame.get_mask_key = self.get_mask_key
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data = frame.format()
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length = len(data)
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trace("send: " + repr(data))
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with self.lock:
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while data:
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l = self._send(data)
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data = data[l:]
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return length
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def send_binary(self, payload):
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return self.send(payload, ABNF.OPCODE_BINARY)
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def ping(self, payload=""):
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"""
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send ping data.
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payload: data payload to send server.
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"""
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if isinstance(payload, six.text_type):
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payload = payload.encode("utf-8")
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self.send(payload, ABNF.OPCODE_PING)
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def pong(self, payload):
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"""
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send pong data.
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payload: data payload to send server.
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"""
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if isinstance(payload, six.text_type):
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payload = payload.encode("utf-8")
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self.send(payload, ABNF.OPCODE_PONG)
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def recv(self):
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"""
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Receive string data(byte array) from the server.
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return value: string(byte array) value.
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"""
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with self.readlock:
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opcode, data = self.recv_data()
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if six.PY3 and opcode == ABNF.OPCODE_TEXT:
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return data.decode("utf-8")
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elif opcode == ABNF.OPCODE_TEXT or opcode == ABNF.OPCODE_BINARY:
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return data
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else:
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return ''
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def recv_data(self, control_frame=False):
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"""
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Receive data with operation code.
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control_frame: a boolean flag indicating whether to return control frame
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data, defaults to False
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return value: tuple of operation code and string(byte array) value.
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"""
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opcode, frame = self.recv_data_frame(control_frame)
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return opcode, frame.data
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def recv_data_frame(self, control_frame=False):
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"""
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Receive data with operation code.
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control_frame: a boolean flag indicating whether to return control frame
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data, defaults to False
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return value: tuple of operation code and string(byte array) value.
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"""
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while True:
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frame = self.recv_frame()
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if not frame:
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# handle error:
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# 'NoneType' object has no attribute 'opcode'
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raise WebSocketProtocolException(
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"Not a valid frame %s" % frame)
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elif frame.opcode in (ABNF.OPCODE_TEXT, ABNF.OPCODE_BINARY, ABNF.OPCODE_CONT):
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self.cont_frame.validate(frame)
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self.cont_frame.add(frame)
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if self.cont_frame.is_fire(frame):
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return self.cont_frame.extract(frame)
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elif frame.opcode == ABNF.OPCODE_CLOSE:
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self.send_close()
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return frame.opcode, frame
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elif frame.opcode == ABNF.OPCODE_PING:
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if len(frame.data) < 126:
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self.pong(frame.data)
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else:
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raise WebSocketProtocolException(
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"Ping message is too long")
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if control_frame:
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return frame.opcode, frame
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elif frame.opcode == ABNF.OPCODE_PONG:
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if control_frame:
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return frame.opcode, frame
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def recv_frame(self):
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"""
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receive data as frame from server.
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return value: ABNF frame object.
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"""
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return self.frame_buffer.recv_frame()
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def send_close(self, status=STATUS_NORMAL, reason=six.b("")):
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"""
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send close data to the server.
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status: status code to send. see STATUS_XXX.
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reason: the reason to close. This must be string or bytes.
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"""
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if status < 0 or status >= ABNF.LENGTH_16:
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raise ValueError("code is invalid range")
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self.connected = False
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self.send(struct.pack('!H', status) + reason, ABNF.OPCODE_CLOSE)
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def close(self, status=STATUS_NORMAL, reason=six.b(""), timeout=3):
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"""
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Close Websocket object
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status: status code to send. see STATUS_XXX.
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reason: the reason to close. This must be string.
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timeout: timeout until receive a close frame.
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If None, it will wait forever until receive a close frame.
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"""
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if self.connected:
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if status < 0 or status >= ABNF.LENGTH_16:
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raise ValueError("code is invalid range")
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try:
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self.connected = False
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self.send(struct.pack('!H', status) +
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reason, ABNF.OPCODE_CLOSE)
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sock_timeout = self.sock.gettimeout()
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self.sock.settimeout(timeout)
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start_time = time.time()
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while timeout is None or time.time() - start_time < timeout:
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try:
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frame = self.recv_frame()
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if frame.opcode != ABNF.OPCODE_CLOSE:
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continue
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if isEnabledForError():
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recv_status = struct.unpack("!H", frame.data[0:2])[0]
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if recv_status != STATUS_NORMAL:
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error("close status: " + repr(recv_status))
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break
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except:
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break
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self.sock.settimeout(sock_timeout)
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self.sock.shutdown(socket.SHUT_RDWR)
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except:
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pass
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self.shutdown()
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def abort(self):
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"""
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Low-level asynchronous abort, wakes up other threads that are waiting in recv_*
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"""
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if self.connected:
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self.sock.shutdown(socket.SHUT_RDWR)
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def shutdown(self):
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"""close socket, immediately."""
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if self.sock:
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self.sock.close()
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self.sock = None
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self.connected = False
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def _send(self, data):
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return send(self.sock, data)
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def _recv(self, bufsize):
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try:
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return recv(self.sock, bufsize)
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except WebSocketConnectionClosedException:
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if self.sock:
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self.sock.close()
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self.sock = None
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self.connected = False
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raise
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|
|
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def create_connection(url, timeout=None, class_=WebSocket, **options):
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"""
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connect to url and return websocket object.
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Connect to url and return the WebSocket object.
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Passing optional timeout parameter will set the timeout on the socket.
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If no timeout is supplied,
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the global default timeout setting returned by getdefauttimeout() is used.
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|
You can customize using 'options'.
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|
If you set "header" list object, you can set your own custom header.
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>>> conn = create_connection("ws://echo.websocket.org/",
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... header=["User-Agent: MyProgram",
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... "x-custom: header"])
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|
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timeout: socket timeout time. This value is integer.
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if you set None for this value,
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it means "use default_timeout value"
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|
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class_: class to instantiate when creating the connection. It has to implement
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|
settimeout and connect. It's __init__ should be compatible with
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WebSocket.__init__, i.e. accept all of it's kwargs.
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|
options: "header" -> custom http header list or dict.
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|
"cookie" -> cookie value.
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|
"origin" -> custom origin url.
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|
"suppress_origin" -> suppress outputting origin header.
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|
"host" -> custom host header string.
|
|
"http_proxy_host" - http proxy host name.
|
|
"http_proxy_port" - http proxy port. If not set, set to 80.
|
|
"http_no_proxy" - host names, which doesn't use proxy.
|
|
"http_proxy_auth" - http proxy auth information.
|
|
tuple of username and password.
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|
default is None
|
|
"enable_multithread" -> enable lock for multithread.
|
|
"redirect_limit" -> number of redirects to follow.
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|
"sockopt" -> socket options
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|
"sslopt" -> ssl option
|
|
"subprotocols" - array of available sub protocols.
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|
default is None.
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|
"skip_utf8_validation" - skip utf8 validation.
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|
"socket" - pre-initialized stream socket.
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|
"""
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|
sockopt = options.pop("sockopt", [])
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|
sslopt = options.pop("sslopt", {})
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|
fire_cont_frame = options.pop("fire_cont_frame", False)
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|
enable_multithread = options.pop("enable_multithread", False)
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|
skip_utf8_validation = options.pop("skip_utf8_validation", False)
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|
websock = class_(sockopt=sockopt, sslopt=sslopt,
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fire_cont_frame=fire_cont_frame,
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enable_multithread=enable_multithread,
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skip_utf8_validation=skip_utf8_validation, **options)
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websock.settimeout(timeout if timeout is not None else getdefaulttimeout())
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websock.connect(url, **options)
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return websock
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