648 lines
20 KiB
Python
648 lines
20 KiB
Python
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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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from typing import Optional, Union
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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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"""
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_core.py
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websocket - WebSocket client library for Python
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Copyright 2023 engn33r
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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__all__ = ["WebSocket", "create_connection"]
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class WebSocket:
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"""
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Low level WebSocket interface.
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This class is based on the WebSocket protocol `draft-hixie-thewebsocketprotocol-76 <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.events")
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>>> ws.recv()
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'echo.websocket.events sponsored by Lob.com'
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>>> ws.send("Hello, Server")
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19
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>>> ws.recv()
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'Hello, Server'
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>>> ws.close()
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Parameters
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----------
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get_mask_key: func
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A callable function to get new mask keys, see the
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WebSocket.set_mask_key's docstring for more information.
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sockopt: tuple
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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
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Optional dict object for ssl socket options. See FAQ for details.
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fire_cont_frame: bool
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Fire recv event for each cont frame. Default is False.
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enable_multithread: bool
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If set to True, lock send method.
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skip_utf8_validation: bool
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Skip utf8 validation.
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"""
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def __init__(
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self,
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get_mask_key=None,
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sockopt=None,
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sslopt=None,
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fire_cont_frame: bool = False,
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enable_multithread: bool = True,
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skip_utf8_validation: bool = False,
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**_,
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):
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"""
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Initialize WebSocket object.
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Parameters
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----------
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sslopt: dict
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Optional dict object for ssl socket options. See FAQ for details.
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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: Optional[socket.socket] = 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(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 mask key. You can customize mask key generator.
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Mainly, this is for testing purpose.
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Parameters
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----------
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func: func
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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) -> Union[float, int, None]:
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"""
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Get the websocket timeout (in seconds) as an int or float
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Returns
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----------
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timeout: int or float
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returns timeout value (in seconds). This value could be either float/integer.
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"""
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return self.sock_opt.timeout
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def settimeout(self, timeout: Union[float, int, None]):
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"""
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Set the timeout to the websocket.
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Parameters
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----------
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timeout: int or float
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timeout time (in seconds). This value could be either float/integer.
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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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try:
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return isinstance(self.sock, ssl.SSLSocket)
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except:
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return False
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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.events",
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... header=["User-Agent: MyProgram",
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... "x-custom: header"])
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Parameters
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----------
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header: list or dict
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Custom http header list or dict.
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cookie: str
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Cookie value.
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origin: str
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Custom origin url.
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connection: str
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Custom connection header value.
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Default value "Upgrade" set in _handshake.py
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suppress_origin: bool
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Suppress outputting origin header.
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host: str
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Custom host header string.
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timeout: int or float
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Socket timeout time. This value is an integer or float.
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If you set None for this value, it means "use default_timeout value"
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http_proxy_host: str
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HTTP proxy host name.
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http_proxy_port: str or int
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HTTP proxy port. Default is 80.
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http_no_proxy: list
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Whitelisted host names that don't use the proxy.
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http_proxy_auth: tuple
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HTTP proxy auth information. Tuple of username and password. Default is None.
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http_proxy_timeout: int or float
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HTTP proxy timeout, default is 60 sec as per python-socks.
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redirect_limit: int
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Number of redirects to follow.
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subprotocols: list
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List of available subprotocols. Default is None.
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socket: socket
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Pre-initialized stream socket.
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"""
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self.sock_opt.timeout = options.get("timeout", self.sock_opt.timeout)
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self.sock, addrs = connect(
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url, self.sock_opt, proxy_info(**options), options.pop("socket", None)
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)
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try:
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self.handshake_response = handshake(self.sock, url, *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(
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url,
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self.sock_opt,
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proxy_info(**options),
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options.pop("socket", None),
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)
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self.handshake_response = handshake(
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self.sock, url, *addrs, **options
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)
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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: Union[bytes, str], opcode: int = ABNF.OPCODE_TEXT) -> int:
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"""
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Send the data as string.
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Parameters
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----------
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payload: str
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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: int
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Operation code (opcode) to send.
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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_text(self, text_data: str) -> int:
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"""
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Sends UTF-8 encoded text.
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"""
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return self.send(text_data, ABNF.OPCODE_TEXT)
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def send_bytes(self, data: Union[bytes, bytearray]) -> int:
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"""
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Sends a sequence of bytes.
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"""
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return self.send(data, ABNF.OPCODE_BINARY)
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def send_frame(self, frame) -> int:
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"""
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Send the data frame.
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>>> ws = create_connection("ws://echo.websocket.events")
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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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Parameters
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----------
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frame: ABNF frame
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frame data created by ABNF.create_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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if isEnabledForTrace():
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trace(f"++Sent raw: {repr(data)}")
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trace(f"++Sent decoded: {frame.__str__()}")
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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: bytes) -> int:
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"""
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Send a binary message (OPCODE_BINARY).
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Parameters
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----------
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payload: bytes
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payload of message to send.
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"""
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return self.send(payload, ABNF.OPCODE_BINARY)
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def ping(self, payload: Union[str, bytes] = ""):
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"""
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Send ping data.
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Parameters
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----------
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payload: str
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data payload to send server.
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"""
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if isinstance(payload, str):
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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: Union[str, bytes] = ""):
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"""
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Send pong data.
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Parameters
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----------
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payload: str
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data payload to send server.
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"""
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if isinstance(payload, str):
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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) -> Union[str, bytes]:
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"""
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Receive string data(byte array) from the server.
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Returns
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----------
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data: 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 opcode == ABNF.OPCODE_TEXT:
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data_received: Union[bytes, str] = data
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if isinstance(data_received, bytes):
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return data_received.decode("utf-8")
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elif isinstance(data_received, str):
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return data_received
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elif opcode == ABNF.OPCODE_BINARY:
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data_binary: bytes = data
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return data_binary
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else:
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return ""
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def recv_data(self, control_frame: bool = False) -> tuple:
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"""
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Receive data with operation code.
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Parameters
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----------
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control_frame: bool
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a boolean flag indicating whether to return control frame
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data, defaults to False
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|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
opcode, frame.data: tuple
|
||
|
|
tuple of operation code and string(byte array) value.
|
||
|
|
"""
|
||
|
|
opcode, frame = self.recv_data_frame(control_frame)
|
||
|
|
return opcode, frame.data
|
||
|
|
|
||
|
|
def recv_data_frame(self, control_frame: bool = False) -> tuple:
|
||
|
|
"""
|
||
|
|
Receive data with operation code.
|
||
|
|
|
||
|
|
If a valid ping message is received, a pong response is sent.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
control_frame: bool
|
||
|
|
a boolean flag indicating whether to return control frame
|
||
|
|
data, defaults to False
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
frame.opcode, frame: tuple
|
||
|
|
tuple of operation code and string(byte array) value.
|
||
|
|
"""
|
||
|
|
while True:
|
||
|
|
frame = self.recv_frame()
|
||
|
|
if isEnabledForTrace():
|
||
|
|
trace(f"++Rcv raw: {repr(frame.format())}")
|
||
|
|
trace(f"++Rcv decoded: {frame.__str__()}")
|
||
|
|
if not frame:
|
||
|
|
# handle error:
|
||
|
|
# 'NoneType' object has no attribute 'opcode'
|
||
|
|
raise WebSocketProtocolException(f"Not a valid frame {frame}")
|
||
|
|
elif frame.opcode in (
|
||
|
|
ABNF.OPCODE_TEXT,
|
||
|
|
ABNF.OPCODE_BINARY,
|
||
|
|
ABNF.OPCODE_CONT,
|
||
|
|
):
|
||
|
|
self.cont_frame.validate(frame)
|
||
|
|
self.cont_frame.add(frame)
|
||
|
|
|
||
|
|
if self.cont_frame.is_fire(frame):
|
||
|
|
return self.cont_frame.extract(frame)
|
||
|
|
|
||
|
|
elif frame.opcode == ABNF.OPCODE_CLOSE:
|
||
|
|
self.send_close()
|
||
|
|
return frame.opcode, frame
|
||
|
|
elif frame.opcode == ABNF.OPCODE_PING:
|
||
|
|
if len(frame.data) < 126:
|
||
|
|
self.pong(frame.data)
|
||
|
|
else:
|
||
|
|
raise WebSocketProtocolException("Ping message is too long")
|
||
|
|
if control_frame:
|
||
|
|
return frame.opcode, frame
|
||
|
|
elif frame.opcode == ABNF.OPCODE_PONG:
|
||
|
|
if control_frame:
|
||
|
|
return frame.opcode, frame
|
||
|
|
|
||
|
|
def recv_frame(self):
|
||
|
|
"""
|
||
|
|
Receive data as frame from server.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
self.frame_buffer.recv_frame(): ABNF frame object
|
||
|
|
"""
|
||
|
|
return self.frame_buffer.recv_frame()
|
||
|
|
|
||
|
|
def send_close(self, status: int = STATUS_NORMAL, reason: bytes = b""):
|
||
|
|
"""
|
||
|
|
Send close data to the server.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
status: int
|
||
|
|
Status code to send. See STATUS_XXX.
|
||
|
|
reason: str or bytes
|
||
|
|
The reason to close. This must be string or UTF-8 bytes.
|
||
|
|
"""
|
||
|
|
if status < 0 or status >= ABNF.LENGTH_16:
|
||
|
|
raise ValueError("code is invalid range")
|
||
|
|
self.connected = False
|
||
|
|
self.send(struct.pack("!H", status) + reason, ABNF.OPCODE_CLOSE)
|
||
|
|
|
||
|
|
def close(self, status: int = STATUS_NORMAL, reason: bytes = b"", timeout: int = 3):
|
||
|
|
"""
|
||
|
|
Close Websocket object
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
status: int
|
||
|
|
Status code to send. See VALID_CLOSE_STATUS in ABNF.
|
||
|
|
reason: bytes
|
||
|
|
The reason to close in UTF-8.
|
||
|
|
timeout: int or float
|
||
|
|
Timeout until receive a close frame.
|
||
|
|
If None, it will wait forever until receive a close frame.
|
||
|
|
"""
|
||
|
|
if not self.connected:
|
||
|
|
return
|
||
|
|
if status < 0 or status >= ABNF.LENGTH_16:
|
||
|
|
raise ValueError("code is invalid range")
|
||
|
|
|
||
|
|
try:
|
||
|
|
self.connected = False
|
||
|
|
self.send(struct.pack("!H", status) + reason, ABNF.OPCODE_CLOSE)
|
||
|
|
sock_timeout = self.sock.gettimeout()
|
||
|
|
self.sock.settimeout(timeout)
|
||
|
|
start_time = time.time()
|
||
|
|
while timeout is None or time.time() - start_time < timeout:
|
||
|
|
try:
|
||
|
|
frame = self.recv_frame()
|
||
|
|
if frame.opcode != ABNF.OPCODE_CLOSE:
|
||
|
|
continue
|
||
|
|
if isEnabledForError():
|
||
|
|
recv_status = struct.unpack("!H", frame.data[0:2])[0]
|
||
|
|
if recv_status >= 3000 and recv_status <= 4999:
|
||
|
|
debug(f"close status: {repr(recv_status)}")
|
||
|
|
elif recv_status != STATUS_NORMAL:
|
||
|
|
error(f"close status: {repr(recv_status)}")
|
||
|
|
break
|
||
|
|
except:
|
||
|
|
break
|
||
|
|
self.sock.settimeout(sock_timeout)
|
||
|
|
self.sock.shutdown(socket.SHUT_RDWR)
|
||
|
|
except:
|
||
|
|
pass
|
||
|
|
|
||
|
|
self.shutdown()
|
||
|
|
|
||
|
|
def abort(self):
|
||
|
|
"""
|
||
|
|
Low-level asynchronous abort, wakes up other threads that are waiting in recv_*
|
||
|
|
"""
|
||
|
|
if self.connected:
|
||
|
|
self.sock.shutdown(socket.SHUT_RDWR)
|
||
|
|
|
||
|
|
def shutdown(self):
|
||
|
|
"""
|
||
|
|
close socket, immediately.
|
||
|
|
"""
|
||
|
|
if self.sock:
|
||
|
|
self.sock.close()
|
||
|
|
self.sock = None
|
||
|
|
self.connected = False
|
||
|
|
|
||
|
|
def _send(self, data: Union[str, bytes]):
|
||
|
|
return send(self.sock, data)
|
||
|
|
|
||
|
|
def _recv(self, bufsize):
|
||
|
|
try:
|
||
|
|
return recv(self.sock, bufsize)
|
||
|
|
except WebSocketConnectionClosedException:
|
||
|
|
if self.sock:
|
||
|
|
self.sock.close()
|
||
|
|
self.sock = None
|
||
|
|
self.connected = False
|
||
|
|
raise
|
||
|
|
|
||
|
|
|
||
|
|
def create_connection(url: str, timeout=None, class_=WebSocket, **options):
|
||
|
|
"""
|
||
|
|
Connect to url and return websocket object.
|
||
|
|
|
||
|
|
Connect to url and return the WebSocket object.
|
||
|
|
Passing optional timeout parameter will set the timeout on the socket.
|
||
|
|
If no timeout is supplied,
|
||
|
|
the global default timeout setting returned by getdefaulttimeout() is used.
|
||
|
|
You can customize using 'options'.
|
||
|
|
If you set "header" list object, you can set your own custom header.
|
||
|
|
|
||
|
|
>>> conn = create_connection("ws://echo.websocket.events",
|
||
|
|
... header=["User-Agent: MyProgram",
|
||
|
|
... "x-custom: header"])
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
class_: class
|
||
|
|
class to instantiate when creating the connection. It has to implement
|
||
|
|
settimeout and connect. It's __init__ should be compatible with
|
||
|
|
WebSocket.__init__, i.e. accept all of it's kwargs.
|
||
|
|
header: list or dict
|
||
|
|
custom http header list or dict.
|
||
|
|
cookie: str
|
||
|
|
Cookie value.
|
||
|
|
origin: str
|
||
|
|
custom origin url.
|
||
|
|
suppress_origin: bool
|
||
|
|
suppress outputting origin header.
|
||
|
|
host: str
|
||
|
|
custom host header string.
|
||
|
|
timeout: int or float
|
||
|
|
socket timeout time. This value could be either float/integer.
|
||
|
|
If set to None, it uses the default_timeout value.
|
||
|
|
http_proxy_host: str
|
||
|
|
HTTP proxy host name.
|
||
|
|
http_proxy_port: str or int
|
||
|
|
HTTP proxy port. If not set, set to 80.
|
||
|
|
http_no_proxy: list
|
||
|
|
Whitelisted host names that don't use the proxy.
|
||
|
|
http_proxy_auth: tuple
|
||
|
|
HTTP proxy auth information. tuple of username and password. Default is None.
|
||
|
|
http_proxy_timeout: int or float
|
||
|
|
HTTP proxy timeout, default is 60 sec as per python-socks.
|
||
|
|
enable_multithread: bool
|
||
|
|
Enable lock for multithread.
|
||
|
|
redirect_limit: int
|
||
|
|
Number of redirects to follow.
|
||
|
|
sockopt: tuple
|
||
|
|
Values for socket.setsockopt.
|
||
|
|
sockopt must be a tuple and each element is an argument of sock.setsockopt.
|
||
|
|
sslopt: dict
|
||
|
|
Optional dict object for ssl socket options. See FAQ for details.
|
||
|
|
subprotocols: list
|
||
|
|
List of available subprotocols. Default is None.
|
||
|
|
skip_utf8_validation: bool
|
||
|
|
Skip utf8 validation.
|
||
|
|
socket: socket
|
||
|
|
Pre-initialized stream socket.
|
||
|
|
"""
|
||
|
|
sockopt = options.pop("sockopt", [])
|
||
|
|
sslopt = options.pop("sslopt", {})
|
||
|
|
fire_cont_frame = options.pop("fire_cont_frame", False)
|
||
|
|
enable_multithread = options.pop("enable_multithread", True)
|
||
|
|
skip_utf8_validation = options.pop("skip_utf8_validation", False)
|
||
|
|
websock = class_(
|
||
|
|
sockopt=sockopt,
|
||
|
|
sslopt=sslopt,
|
||
|
|
fire_cont_frame=fire_cont_frame,
|
||
|
|
enable_multithread=enable_multithread,
|
||
|
|
skip_utf8_validation=skip_utf8_validation,
|
||
|
|
**options,
|
||
|
|
)
|
||
|
|
websock.settimeout(timeout if timeout is not None else getdefaulttimeout())
|
||
|
|
websock.connect(url, **options)
|
||
|
|
return websock
|