mirror of https://github.com/morpheus65535/bazarr
413 lines
15 KiB
Python
413 lines
15 KiB
Python
"""
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"""
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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 2021 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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import selectors
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import sys
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import threading
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import time
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import traceback
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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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from . import _logging
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__all__ = ["WebSocketApp"]
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class Dispatcher:
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"""
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Dispatcher
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"""
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def __init__(self, app, ping_timeout):
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self.app = app
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self.ping_timeout = ping_timeout
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def read(self, sock, read_callback, check_callback):
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while self.app.keep_running:
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sel = selectors.DefaultSelector()
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sel.register(self.app.sock.sock, selectors.EVENT_READ)
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r = sel.select(self.ping_timeout)
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if r:
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if not read_callback():
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break
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check_callback()
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sel.close()
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class SSLDispatcher:
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"""
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SSLDispatcher
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"""
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def __init__(self, app, ping_timeout):
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self.app = app
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self.ping_timeout = ping_timeout
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def read(self, sock, read_callback, check_callback):
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while self.app.keep_running:
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r = self.select()
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if r:
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if not read_callback():
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break
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check_callback()
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def select(self):
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sock = self.app.sock.sock
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if sock.pending():
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return [sock,]
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sel = selectors.DefaultSelector()
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sel.register(sock, selectors.EVENT_READ)
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r = sel.select(self.ping_timeout)
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sel.close()
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if len(r) > 0:
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return r[0][0]
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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__(self, url, header=None,
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on_open=None, on_message=None, on_error=None,
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on_close=None, on_ping=None, on_pong=None,
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on_cont_message=None,
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keep_running=True, get_mask_key=None, cookie=None,
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subprotocols=None,
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on_data=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
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Custom header for websocket handshake.
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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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"""
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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 = None
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self.last_ping_tm = 0
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self.last_pong_tm = 0
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self.subprotocols = subprotocols
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def send(self, data, opcode=ABNF.OPCODE_TEXT):
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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(
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"Connection is already closed.")
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def close(self, **kwargs):
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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 _send_ping(self, interval, event, payload):
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while not event.wait(interval):
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self.last_ping_tm = time.time()
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if self.sock:
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try:
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self.sock.ping(payload)
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except Exception as ex:
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_logging.warning("send_ping routine terminated: {}".format(ex))
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break
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def run_forever(self, sockopt=None, sslopt=None,
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ping_interval=0, ping_timeout=None,
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ping_payload="",
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http_proxy_host=None, http_proxy_port=None,
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http_no_proxy=None, http_proxy_auth=None,
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skip_utf8_validation=False,
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host=None, origin=None, dispatcher=None,
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suppress_origin=False, proxy_type=None):
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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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skip_utf8_validation: bool
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skip utf8 validation.
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host: str
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update host header.
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origin: str
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update origin header.
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dispatcher: Dispatcher object
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customize reading data from socket.
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suppress_origin: bool
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suppress outputting origin header.
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Returns
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-------
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teardown: bool
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False if caught KeyboardInterrupt, True if other exception was raised during a loop
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"""
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if ping_timeout is not None and ping_timeout <= 0:
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raise WebSocketException("Ensure ping_timeout > 0")
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if ping_interval is not None and ping_interval < 0:
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raise WebSocketException("Ensure ping_interval >= 0")
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if ping_timeout and ping_interval and ping_interval <= ping_timeout:
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raise WebSocketException("Ensure ping_interval > ping_timeout")
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if not sockopt:
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sockopt = []
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if not sslopt:
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sslopt = {}
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if self.sock:
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raise WebSocketException("socket is already opened")
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thread = None
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self.keep_running = True
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self.last_ping_tm = 0
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self.last_pong_tm = 0
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def teardown(close_frame=None):
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"""
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Tears down the connection.
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Parameters
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----------
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close_frame: ABNF frame
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If close_frame is set, the on_close handler is invoked
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with the statusCode and reason from the provided frame.
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"""
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if thread and thread.is_alive():
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event.set()
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thread.join()
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self.keep_running = False
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if self.sock:
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self.sock.close()
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close_status_code, close_reason = self._get_close_args(
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close_frame if close_frame else None)
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self.sock = None
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# Finally call the callback AFTER all teardown is complete
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self._callback(self.on_close, close_status_code, close_reason)
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try:
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self.sock = WebSocket(
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self.get_mask_key, sockopt=sockopt, sslopt=sslopt,
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fire_cont_frame=self.on_cont_message is not None,
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skip_utf8_validation=skip_utf8_validation,
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enable_multithread=True)
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self.sock.settimeout(getdefaulttimeout())
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self.sock.connect(
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self.url, header=self.header, cookie=self.cookie,
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http_proxy_host=http_proxy_host,
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http_proxy_port=http_proxy_port, http_no_proxy=http_no_proxy,
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http_proxy_auth=http_proxy_auth, subprotocols=self.subprotocols,
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host=host, origin=origin, suppress_origin=suppress_origin,
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proxy_type=proxy_type)
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if not dispatcher:
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dispatcher = self.create_dispatcher(ping_timeout)
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self._callback(self.on_open)
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if ping_interval:
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event = threading.Event()
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thread = threading.Thread(
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target=self._send_ping, args=(ping_interval, event, ping_payload))
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thread.daemon = True
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thread.start()
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def read():
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if not self.keep_running:
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return teardown()
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op_code, frame = self.sock.recv_data_frame(True)
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if op_code == ABNF.OPCODE_CLOSE:
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return teardown(frame)
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elif op_code == ABNF.OPCODE_PING:
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self._callback(self.on_ping, frame.data)
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elif op_code == ABNF.OPCODE_PONG:
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self.last_pong_tm = time.time()
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self._callback(self.on_pong, frame.data)
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elif op_code == ABNF.OPCODE_CONT and self.on_cont_message:
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self._callback(self.on_data, frame.data,
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frame.opcode, frame.fin)
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self._callback(self.on_cont_message,
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frame.data, frame.fin)
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else:
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data = frame.data
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if op_code == ABNF.OPCODE_TEXT:
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data = data.decode("utf-8")
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self._callback(self.on_data, data, frame.opcode, True)
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self._callback(self.on_message, data)
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return True
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def check():
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if (ping_timeout):
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has_timeout_expired = time.time() - self.last_ping_tm > ping_timeout
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has_pong_not_arrived_after_last_ping = self.last_pong_tm - self.last_ping_tm < 0
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has_pong_arrived_too_late = self.last_pong_tm - self.last_ping_tm > ping_timeout
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if (self.last_ping_tm and
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has_timeout_expired and
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(has_pong_not_arrived_after_last_ping or has_pong_arrived_too_late)):
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raise WebSocketTimeoutException("ping/pong timed out")
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return True
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dispatcher.read(self.sock.sock, read, check)
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except (Exception, KeyboardInterrupt, SystemExit) as e:
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self._callback(self.on_error, e)
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if isinstance(e, SystemExit):
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# propagate SystemExit further
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raise
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teardown()
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return not isinstance(e, KeyboardInterrupt)
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def create_dispatcher(self, ping_timeout):
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timeout = ping_timeout or 10
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if self.sock.is_ssl():
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return SSLDispatcher(self, timeout)
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return Dispatcher(self, timeout)
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def _get_close_args(self, close_frame):
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"""
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_get_close_args extracts the close code and reason from the close body
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if it exists (RFC6455 says WebSocket Connection Close Code is optional)
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"""
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# Need to catch the case where close_frame is None
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# Otherwise the following if statement causes an error
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if not self.on_close or not close_frame:
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return [None, None]
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# Extract close frame status code
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if close_frame.data and len(close_frame.data) >= 2:
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close_status_code = 256 * close_frame.data[0] + close_frame.data[1]
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reason = close_frame.data[2:].decode('utf-8')
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return [close_status_code, reason]
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else:
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# Most likely reached this because len(close_frame_data.data) < 2
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return [None, None]
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def _callback(self, callback, *args):
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if callback:
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try:
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callback(self, *args)
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except Exception as e:
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_logging.error("error from callback {}: {}".format(callback, e))
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if self.on_error:
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self.on_error(self, e)
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