666 lines
23 KiB
Python
666 lines
23 KiB
Python
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import inspect
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import selectors
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import socket
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import threading
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import time
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from typing import Any, Callable, Optional, Union
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from . import _logging
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from ._abnf import ABNF
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from ._core import WebSocket, getdefaulttimeout
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from ._exceptions import (
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WebSocketConnectionClosedException,
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WebSocketException,
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WebSocketTimeoutException,
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)
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from ._url import parse_url
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"""
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_app.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__ = ["WebSocketApp"]
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RECONNECT = 0
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def setReconnect(reconnectInterval: int) -> None:
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global RECONNECT
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RECONNECT = reconnectInterval
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class DispatcherBase:
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"""
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DispatcherBase
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"""
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def __init__(self, app: Any, ping_timeout: Union[float, int, None]) -> None:
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self.app = app
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self.ping_timeout = ping_timeout
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def timeout(self, seconds: Union[float, int, None], callback: Callable) -> None:
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time.sleep(seconds)
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callback()
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def reconnect(self, seconds: int, reconnector: Callable) -> None:
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try:
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_logging.info(
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f"reconnect() - retrying in {seconds} seconds [{len(inspect.stack())} frames in stack]"
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)
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time.sleep(seconds)
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reconnector(reconnecting=True)
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except KeyboardInterrupt as e:
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_logging.info(f"User exited {e}")
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raise e
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class Dispatcher(DispatcherBase):
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"""
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Dispatcher
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"""
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def read(
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self,
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sock: socket.socket,
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read_callback: Callable,
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check_callback: Callable,
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) -> None:
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sel = selectors.DefaultSelector()
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sel.register(self.app.sock.sock, selectors.EVENT_READ)
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try:
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while self.app.keep_running:
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if sel.select(self.ping_timeout):
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if not read_callback():
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break
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check_callback()
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finally:
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sel.close()
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class SSLDispatcher(DispatcherBase):
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"""
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SSLDispatcher
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"""
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def read(
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self,
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sock: socket.socket,
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read_callback: Callable,
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check_callback: Callable,
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) -> None:
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sock = self.app.sock.sock
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sel = selectors.DefaultSelector()
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sel.register(sock, selectors.EVENT_READ)
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try:
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while self.app.keep_running:
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if self.select(sock, sel):
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if not read_callback():
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break
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check_callback()
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finally:
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sel.close()
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def select(self, sock, sel: selectors.DefaultSelector):
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sock = self.app.sock.sock
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if sock.pending():
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return [
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sock,
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]
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r = sel.select(self.ping_timeout)
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if len(r) > 0:
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return r[0][0]
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class WrappedDispatcher:
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"""
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WrappedDispatcher
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"""
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def __init__(self, app, ping_timeout: Union[float, int, None], dispatcher) -> None:
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self.app = app
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self.ping_timeout = ping_timeout
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self.dispatcher = dispatcher
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dispatcher.signal(2, dispatcher.abort) # keyboard interrupt
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def read(
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self,
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sock: socket.socket,
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read_callback: Callable,
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check_callback: Callable,
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) -> None:
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self.dispatcher.read(sock, read_callback)
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self.ping_timeout and self.timeout(self.ping_timeout, check_callback)
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def timeout(self, seconds: float, callback: Callable) -> None:
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self.dispatcher.timeout(seconds, callback)
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def reconnect(self, seconds: int, reconnector: Callable) -> None:
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self.timeout(seconds, reconnector)
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class WebSocketApp:
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"""
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Higher level of APIs are provided. The interface is like JavaScript WebSocket object.
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"""
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def __init__(
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self,
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url: str,
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header: Union[list, dict, Callable, None] = None,
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on_open: Optional[Callable[[WebSocket], None]] = None,
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on_message: Optional[Callable[[WebSocket, Any], None]] = None,
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on_error: Optional[Callable[[WebSocket, Any], None]] = None,
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on_close: Optional[Callable[[WebSocket, Any, Any], None]] = None,
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on_ping: Optional[Callable] = None,
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on_pong: Optional[Callable] = None,
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on_cont_message: Optional[Callable] = None,
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keep_running: bool = True,
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get_mask_key: Optional[Callable] = None,
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cookie: Optional[str] = None,
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subprotocols: Optional[list] = None,
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on_data: Optional[Callable] = None,
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socket: Optional[socket.socket] = None,
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) -> None:
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"""
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WebSocketApp initialization
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Parameters
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----------
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url: str
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Websocket url.
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header: list or dict or Callable
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Custom header for websocket handshake.
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If the parameter is a callable object, it is called just before the connection attempt.
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The returned dict or list is used as custom header value.
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This could be useful in order to properly setup timestamp dependent headers.
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on_open: function
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Callback object which is called at opening websocket.
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on_open has one argument.
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The 1st argument is this class object.
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on_message: function
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Callback object which is called when received data.
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on_message has 2 arguments.
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The 1st argument is this class object.
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The 2nd argument is utf-8 data received from the server.
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on_error: function
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Callback object which is called when we get error.
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on_error has 2 arguments.
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The 1st argument is this class object.
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The 2nd argument is exception object.
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on_close: function
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Callback object which is called when connection is closed.
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on_close has 3 arguments.
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The 1st argument is this class object.
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The 2nd argument is close_status_code.
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The 3rd argument is close_msg.
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on_cont_message: function
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Callback object which is called when a continuation
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frame is received.
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on_cont_message has 3 arguments.
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The 1st argument is this class object.
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The 2nd argument is utf-8 string which we get from the server.
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The 3rd argument is continue flag. if 0, the data continue
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to next frame data
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on_data: function
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Callback object which is called when a message received.
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This is called before on_message or on_cont_message,
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and then on_message or on_cont_message is called.
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on_data has 4 argument.
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The 1st argument is this class object.
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The 2nd argument is utf-8 string which we get from the server.
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The 3rd argument is data type. ABNF.OPCODE_TEXT or ABNF.OPCODE_BINARY will be came.
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The 4th argument is continue flag. If 0, the data continue
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keep_running: bool
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This parameter is obsolete and ignored.
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get_mask_key: function
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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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cookie: str
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Cookie value.
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subprotocols: list
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List of available sub protocols. 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.url = url
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self.header = header if header is not None else []
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self.cookie = cookie
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self.on_open = on_open
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self.on_message = on_message
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self.on_data = on_data
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self.on_error = on_error
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self.on_close = on_close
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self.on_ping = on_ping
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self.on_pong = on_pong
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self.on_cont_message = on_cont_message
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self.keep_running = False
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self.get_mask_key = get_mask_key
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self.sock: Optional[WebSocket] = None
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self.last_ping_tm = float(0)
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self.last_pong_tm = float(0)
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self.ping_thread: Optional[threading.Thread] = None
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self.stop_ping: Optional[threading.Event] = None
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self.ping_interval = float(0)
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self.ping_timeout: Union[float, int, None] = None
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self.ping_payload = ""
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self.subprotocols = subprotocols
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self.prepared_socket = socket
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self.has_errored = False
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self.has_done_teardown = False
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self.has_done_teardown_lock = threading.Lock()
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def send(self, data: Union[bytes, str], opcode: int = ABNF.OPCODE_TEXT) -> None:
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"""
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send message
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Parameters
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----------
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data: str
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Message to send. If you set opcode to OPCODE_TEXT,
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data must be utf-8 string or unicode.
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opcode: int
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Operation code of data. Default is OPCODE_TEXT.
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"""
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if not self.sock or self.sock.send(data, opcode) == 0:
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raise WebSocketConnectionClosedException("Connection is already closed.")
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def send_text(self, text_data: str) -> None:
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"""
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Sends UTF-8 encoded text.
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"""
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if not self.sock or self.sock.send(text_data, ABNF.OPCODE_TEXT) == 0:
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raise WebSocketConnectionClosedException("Connection is already closed.")
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def send_bytes(self, data: Union[bytes, bytearray]) -> None:
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"""
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Sends a sequence of bytes.
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"""
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if not self.sock or self.sock.send(data, ABNF.OPCODE_BINARY) == 0:
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raise WebSocketConnectionClosedException("Connection is already closed.")
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def close(self, **kwargs) -> None:
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"""
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Close websocket connection.
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"""
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self.keep_running = False
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if self.sock:
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self.sock.close(**kwargs)
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self.sock = None
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def _start_ping_thread(self) -> None:
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self.last_ping_tm = self.last_pong_tm = float(0)
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self.stop_ping = threading.Event()
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self.ping_thread = threading.Thread(target=self._send_ping)
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self.ping_thread.daemon = True
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self.ping_thread.start()
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def _stop_ping_thread(self) -> None:
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if self.stop_ping:
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self.stop_ping.set()
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if self.ping_thread and self.ping_thread.is_alive():
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self.ping_thread.join(3)
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self.last_ping_tm = self.last_pong_tm = float(0)
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def _send_ping(self) -> None:
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if self.stop_ping.wait(self.ping_interval) or self.keep_running is False:
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return
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while not self.stop_ping.wait(self.ping_interval) and self.keep_running is True:
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if self.sock:
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self.last_ping_tm = time.time()
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try:
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_logging.debug("Sending ping")
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self.sock.ping(self.ping_payload)
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except Exception as e:
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_logging.debug(f"Failed to send ping: {e}")
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def run_forever(
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self,
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sockopt: tuple = None,
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sslopt: dict = None,
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ping_interval: Union[float, int] = 0,
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ping_timeout: Union[float, int, None] = None,
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ping_payload: str = "",
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http_proxy_host: str = None,
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http_proxy_port: Union[int, str] = None,
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http_no_proxy: list = None,
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http_proxy_auth: tuple = None,
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http_proxy_timeout: Optional[float] = None,
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skip_utf8_validation: bool = False,
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host: str = None,
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origin: str = None,
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dispatcher=None,
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suppress_origin: bool = False,
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proxy_type: str = None,
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reconnect: int = None,
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) -> bool:
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"""
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Run event loop for WebSocket framework.
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This loop is an infinite loop and is alive while websocket is available.
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Parameters
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----------
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sockopt: tuple
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Values for socket.setsockopt.
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sockopt must be tuple
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and each element is argument of sock.setsockopt.
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sslopt: dict
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Optional dict object for ssl socket option.
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ping_interval: int or float
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Automatically send "ping" command
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every specified period (in seconds).
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If set to 0, no ping is sent periodically.
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ping_timeout: int or float
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Timeout (in seconds) if the pong message is not received.
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ping_payload: str
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Payload message to send with each ping.
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http_proxy_host: str
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HTTP proxy host name.
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http_proxy_port: int or str
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HTTP proxy port. If not set, set to 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_timeout: int or float
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HTTP proxy timeout, default is 60 sec as per python-socks.
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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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||
|
|
skip_utf8_validation: bool
|
||
|
|
skip utf8 validation.
|
||
|
|
host: str
|
||
|
|
update host header.
|
||
|
|
origin: str
|
||
|
|
update origin header.
|
||
|
|
dispatcher: Dispatcher object
|
||
|
|
customize reading data from socket.
|
||
|
|
suppress_origin: bool
|
||
|
|
suppress outputting origin header.
|
||
|
|
proxy_type: str
|
||
|
|
type of proxy from: http, socks4, socks4a, socks5, socks5h
|
||
|
|
reconnect: int
|
||
|
|
delay interval when reconnecting
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
teardown: bool
|
||
|
|
False if the `WebSocketApp` is closed or caught KeyboardInterrupt,
|
||
|
|
True if any other exception was raised during a loop.
|
||
|
|
"""
|
||
|
|
|
||
|
|
if reconnect is None:
|
||
|
|
reconnect = RECONNECT
|
||
|
|
|
||
|
|
if ping_timeout is not None and ping_timeout <= 0:
|
||
|
|
raise WebSocketException("Ensure ping_timeout > 0")
|
||
|
|
if ping_interval is not None and ping_interval < 0:
|
||
|
|
raise WebSocketException("Ensure ping_interval >= 0")
|
||
|
|
if ping_timeout and ping_interval and ping_interval <= ping_timeout:
|
||
|
|
raise WebSocketException("Ensure ping_interval > ping_timeout")
|
||
|
|
if not sockopt:
|
||
|
|
sockopt = ()
|
||
|
|
if not sslopt:
|
||
|
|
sslopt = {}
|
||
|
|
if self.sock:
|
||
|
|
raise WebSocketException("socket is already opened")
|
||
|
|
|
||
|
|
self.ping_interval = ping_interval
|
||
|
|
self.ping_timeout = ping_timeout
|
||
|
|
self.ping_payload = ping_payload
|
||
|
|
self.keep_running = True
|
||
|
|
|
||
|
|
def teardown(close_frame: ABNF = None):
|
||
|
|
"""
|
||
|
|
Tears down the connection.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
close_frame: ABNF frame
|
||
|
|
If close_frame is set, the on_close handler is invoked
|
||
|
|
with the statusCode and reason from the provided frame.
|
||
|
|
"""
|
||
|
|
|
||
|
|
# teardown() is called in many code paths to ensure resources are cleaned up and on_close is fired.
|
||
|
|
# To ensure the work is only done once, we use this bool and lock.
|
||
|
|
with self.has_done_teardown_lock:
|
||
|
|
if self.has_done_teardown:
|
||
|
|
return
|
||
|
|
self.has_done_teardown = True
|
||
|
|
|
||
|
|
self._stop_ping_thread()
|
||
|
|
self.keep_running = False
|
||
|
|
if self.sock:
|
||
|
|
self.sock.close()
|
||
|
|
close_status_code, close_reason = self._get_close_args(
|
||
|
|
close_frame if close_frame else None
|
||
|
|
)
|
||
|
|
self.sock = None
|
||
|
|
|
||
|
|
# Finally call the callback AFTER all teardown is complete
|
||
|
|
self._callback(self.on_close, close_status_code, close_reason)
|
||
|
|
|
||
|
|
def setSock(reconnecting: bool = False) -> None:
|
||
|
|
if reconnecting and self.sock:
|
||
|
|
self.sock.shutdown()
|
||
|
|
|
||
|
|
self.sock = WebSocket(
|
||
|
|
self.get_mask_key,
|
||
|
|
sockopt=sockopt,
|
||
|
|
sslopt=sslopt,
|
||
|
|
fire_cont_frame=self.on_cont_message is not None,
|
||
|
|
skip_utf8_validation=skip_utf8_validation,
|
||
|
|
enable_multithread=True,
|
||
|
|
)
|
||
|
|
|
||
|
|
self.sock.settimeout(getdefaulttimeout())
|
||
|
|
try:
|
||
|
|
header = self.header() if callable(self.header) else self.header
|
||
|
|
|
||
|
|
self.sock.connect(
|
||
|
|
self.url,
|
||
|
|
header=header,
|
||
|
|
cookie=self.cookie,
|
||
|
|
http_proxy_host=http_proxy_host,
|
||
|
|
http_proxy_port=http_proxy_port,
|
||
|
|
http_no_proxy=http_no_proxy,
|
||
|
|
http_proxy_auth=http_proxy_auth,
|
||
|
|
http_proxy_timeout=http_proxy_timeout,
|
||
|
|
subprotocols=self.subprotocols,
|
||
|
|
host=host,
|
||
|
|
origin=origin,
|
||
|
|
suppress_origin=suppress_origin,
|
||
|
|
proxy_type=proxy_type,
|
||
|
|
socket=self.prepared_socket,
|
||
|
|
)
|
||
|
|
|
||
|
|
_logging.info("Websocket connected")
|
||
|
|
|
||
|
|
if self.ping_interval:
|
||
|
|
self._start_ping_thread()
|
||
|
|
|
||
|
|
self._callback(self.on_open)
|
||
|
|
|
||
|
|
dispatcher.read(self.sock.sock, read, check)
|
||
|
|
except (
|
||
|
|
WebSocketConnectionClosedException,
|
||
|
|
ConnectionRefusedError,
|
||
|
|
KeyboardInterrupt,
|
||
|
|
SystemExit,
|
||
|
|
Exception,
|
||
|
|
) as e:
|
||
|
|
handleDisconnect(e, reconnecting)
|
||
|
|
|
||
|
|
def read() -> bool:
|
||
|
|
if not self.keep_running:
|
||
|
|
return teardown()
|
||
|
|
|
||
|
|
try:
|
||
|
|
op_code, frame = self.sock.recv_data_frame(True)
|
||
|
|
except (
|
||
|
|
WebSocketConnectionClosedException,
|
||
|
|
KeyboardInterrupt,
|
||
|
|
) as e:
|
||
|
|
if custom_dispatcher:
|
||
|
|
return handleDisconnect(e)
|
||
|
|
else:
|
||
|
|
raise e
|
||
|
|
|
||
|
|
if op_code == ABNF.OPCODE_CLOSE:
|
||
|
|
return teardown(frame)
|
||
|
|
elif op_code == ABNF.OPCODE_PING:
|
||
|
|
self._callback(self.on_ping, frame.data)
|
||
|
|
elif op_code == ABNF.OPCODE_PONG:
|
||
|
|
self.last_pong_tm = time.time()
|
||
|
|
self._callback(self.on_pong, frame.data)
|
||
|
|
elif op_code == ABNF.OPCODE_CONT and self.on_cont_message:
|
||
|
|
self._callback(self.on_data, frame.data, frame.opcode, frame.fin)
|
||
|
|
self._callback(self.on_cont_message, frame.data, frame.fin)
|
||
|
|
else:
|
||
|
|
data = frame.data
|
||
|
|
if op_code == ABNF.OPCODE_TEXT and not skip_utf8_validation:
|
||
|
|
data = data.decode("utf-8")
|
||
|
|
self._callback(self.on_data, data, frame.opcode, True)
|
||
|
|
self._callback(self.on_message, data)
|
||
|
|
|
||
|
|
return True
|
||
|
|
|
||
|
|
def check() -> bool:
|
||
|
|
if self.ping_timeout:
|
||
|
|
has_timeout_expired = (
|
||
|
|
time.time() - self.last_ping_tm > self.ping_timeout
|
||
|
|
)
|
||
|
|
has_pong_not_arrived_after_last_ping = (
|
||
|
|
self.last_pong_tm - self.last_ping_tm < 0
|
||
|
|
)
|
||
|
|
has_pong_arrived_too_late = (
|
||
|
|
self.last_pong_tm - self.last_ping_tm > self.ping_timeout
|
||
|
|
)
|
||
|
|
|
||
|
|
if (
|
||
|
|
self.last_ping_tm
|
||
|
|
and has_timeout_expired
|
||
|
|
and (
|
||
|
|
has_pong_not_arrived_after_last_ping
|
||
|
|
or has_pong_arrived_too_late
|
||
|
|
)
|
||
|
|
):
|
||
|
|
raise WebSocketTimeoutException("ping/pong timed out")
|
||
|
|
return True
|
||
|
|
|
||
|
|
def handleDisconnect(
|
||
|
|
e: Union[
|
||
|
|
WebSocketConnectionClosedException,
|
||
|
|
ConnectionRefusedError,
|
||
|
|
KeyboardInterrupt,
|
||
|
|
SystemExit,
|
||
|
|
Exception,
|
||
|
|
],
|
||
|
|
reconnecting: bool = False,
|
||
|
|
) -> bool:
|
||
|
|
self.has_errored = True
|
||
|
|
self._stop_ping_thread()
|
||
|
|
if not reconnecting:
|
||
|
|
self._callback(self.on_error, e)
|
||
|
|
|
||
|
|
if isinstance(e, (KeyboardInterrupt, SystemExit)):
|
||
|
|
teardown()
|
||
|
|
# Propagate further
|
||
|
|
raise
|
||
|
|
|
||
|
|
if reconnect:
|
||
|
|
_logging.info(f"{e} - reconnect")
|
||
|
|
if custom_dispatcher:
|
||
|
|
_logging.debug(
|
||
|
|
f"Calling custom dispatcher reconnect [{len(inspect.stack())} frames in stack]"
|
||
|
|
)
|
||
|
|
dispatcher.reconnect(reconnect, setSock)
|
||
|
|
else:
|
||
|
|
_logging.error(f"{e} - goodbye")
|
||
|
|
teardown()
|
||
|
|
|
||
|
|
custom_dispatcher = bool(dispatcher)
|
||
|
|
dispatcher = self.create_dispatcher(
|
||
|
|
ping_timeout, dispatcher, parse_url(self.url)[3]
|
||
|
|
)
|
||
|
|
|
||
|
|
try:
|
||
|
|
setSock()
|
||
|
|
if not custom_dispatcher and reconnect:
|
||
|
|
while self.keep_running:
|
||
|
|
_logging.debug(
|
||
|
|
f"Calling dispatcher reconnect [{len(inspect.stack())} frames in stack]"
|
||
|
|
)
|
||
|
|
dispatcher.reconnect(reconnect, setSock)
|
||
|
|
except (KeyboardInterrupt, Exception) as e:
|
||
|
|
_logging.info(f"tearing down on exception {e}")
|
||
|
|
teardown()
|
||
|
|
finally:
|
||
|
|
if not custom_dispatcher:
|
||
|
|
# Ensure teardown was called before returning from run_forever
|
||
|
|
teardown()
|
||
|
|
|
||
|
|
return self.has_errored
|
||
|
|
|
||
|
|
def create_dispatcher(
|
||
|
|
self,
|
||
|
|
ping_timeout: Union[float, int, None],
|
||
|
|
dispatcher: Optional[DispatcherBase] = None,
|
||
|
|
is_ssl: bool = False,
|
||
|
|
) -> Union[Dispatcher, SSLDispatcher, WrappedDispatcher]:
|
||
|
|
if dispatcher: # If custom dispatcher is set, use WrappedDispatcher
|
||
|
|
return WrappedDispatcher(self, ping_timeout, dispatcher)
|
||
|
|
timeout = ping_timeout or 10
|
||
|
|
if is_ssl:
|
||
|
|
return SSLDispatcher(self, timeout)
|
||
|
|
return Dispatcher(self, timeout)
|
||
|
|
|
||
|
|
def _get_close_args(self, close_frame: ABNF) -> list:
|
||
|
|
"""
|
||
|
|
_get_close_args extracts the close code and reason from the close body
|
||
|
|
if it exists (RFC6455 says WebSocket Connection Close Code is optional)
|
||
|
|
"""
|
||
|
|
# Need to catch the case where close_frame is None
|
||
|
|
# Otherwise the following if statement causes an error
|
||
|
|
if not self.on_close or not close_frame:
|
||
|
|
return [None, None]
|
||
|
|
|
||
|
|
# Extract close frame status code
|
||
|
|
if close_frame.data and len(close_frame.data) >= 2:
|
||
|
|
close_status_code = 256 * int(close_frame.data[0]) + int(
|
||
|
|
close_frame.data[1]
|
||
|
|
)
|
||
|
|
reason = close_frame.data[2:]
|
||
|
|
if isinstance(reason, bytes):
|
||
|
|
reason = reason.decode("utf-8")
|
||
|
|
return [close_status_code, reason]
|
||
|
|
else:
|
||
|
|
# Most likely reached this because len(close_frame_data.data) < 2
|
||
|
|
return [None, None]
|
||
|
|
|
||
|
|
def _callback(self, callback, *args) -> None:
|
||
|
|
if callback:
|
||
|
|
try:
|
||
|
|
callback(self, *args)
|
||
|
|
|
||
|
|
except Exception as e:
|
||
|
|
_logging.error(f"error from callback {callback}: {e}")
|
||
|
|
if self.on_error:
|
||
|
|
self.on_error(self, e)
|