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|
import errno
import selectors
import socket
from typing import Union
from ._exceptions import (
WebSocketConnectionClosedException,
WebSocketTimeoutException,
)
from ._ssl_compat import SSLError, SSLWantReadError, SSLWantWriteError
from ._utils import extract_error_code, extract_err_message
"""
_socket.py
websocket - WebSocket client library for Python
Copyright 2024 engn33r
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
DEFAULT_SOCKET_OPTION = [(socket.SOL_TCP, socket.TCP_NODELAY, 1)]
if hasattr(socket, "SO_KEEPALIVE"):
DEFAULT_SOCKET_OPTION.append((socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1))
if hasattr(socket, "TCP_KEEPIDLE"):
DEFAULT_SOCKET_OPTION.append((socket.SOL_TCP, socket.TCP_KEEPIDLE, 30))
if hasattr(socket, "TCP_KEEPINTVL"):
DEFAULT_SOCKET_OPTION.append((socket.SOL_TCP, socket.TCP_KEEPINTVL, 10))
if hasattr(socket, "TCP_KEEPCNT"):
DEFAULT_SOCKET_OPTION.append((socket.SOL_TCP, socket.TCP_KEEPCNT, 3))
_default_timeout = None
__all__ = [
"DEFAULT_SOCKET_OPTION",
"sock_opt",
"setdefaulttimeout",
"getdefaulttimeout",
"recv",
"recv_line",
"send",
]
class sock_opt:
def __init__(self, sockopt: list, sslopt: dict) -> None:
if sockopt is None:
sockopt = []
if sslopt is None:
sslopt = {}
self.sockopt = sockopt
self.sslopt = sslopt
self.timeout = None
def setdefaulttimeout(timeout: Union[int, float, None]) -> None:
"""
Set the global timeout setting to connect.
Parameters
----------
timeout: int or float
default socket timeout time (in seconds)
"""
global _default_timeout
_default_timeout = timeout
def getdefaulttimeout() -> Union[int, float, None]:
"""
Get default timeout
Returns
----------
_default_timeout: int or float
Return the global timeout setting (in seconds) to connect.
"""
return _default_timeout
def recv(sock: socket.socket, bufsize: int) -> bytes:
if not sock:
raise WebSocketConnectionClosedException("socket is already closed.")
def _recv():
try:
return sock.recv(bufsize)
except SSLWantReadError:
pass
except socket.error as exc:
error_code = extract_error_code(exc)
if error_code not in [errno.EAGAIN, errno.EWOULDBLOCK]:
raise
sel = selectors.DefaultSelector()
sel.register(sock, selectors.EVENT_READ)
r = sel.select(sock.gettimeout())
sel.close()
if r:
return sock.recv(bufsize)
try:
if sock.gettimeout() == 0:
bytes_ = sock.recv(bufsize)
else:
bytes_ = _recv()
except TimeoutError:
raise WebSocketTimeoutException("Connection timed out")
except socket.timeout as e:
message = extract_err_message(e)
raise WebSocketTimeoutException(message)
except SSLError as e:
message = extract_err_message(e)
if isinstance(message, str) and "timed out" in message:
raise WebSocketTimeoutException(message)
else:
raise
if not bytes_:
raise WebSocketConnectionClosedException("Connection to remote host was lost.")
return bytes_
def recv_line(sock: socket.socket) -> bytes:
line = []
while True:
c = recv(sock, 1)
line.append(c)
if c == b"\n":
break
return b"".join(line)
def send(sock: socket.socket, data: Union[bytes, str]) -> int:
if isinstance(data, str):
data = data.encode("utf-8")
if not sock:
raise WebSocketConnectionClosedException("socket is already closed.")
def _send():
try:
return sock.send(data)
except SSLWantWriteError:
pass
except socket.error as exc:
error_code = extract_error_code(exc)
if error_code is None:
raise
if error_code not in [errno.EAGAIN, errno.EWOULDBLOCK]:
raise
sel = selectors.DefaultSelector()
sel.register(sock, selectors.EVENT_WRITE)
w = sel.select(sock.gettimeout())
sel.close()
if w:
return sock.send(data)
try:
if sock.gettimeout() == 0:
return sock.send(data)
else:
return _send()
except socket.timeout as e:
message = extract_err_message(e)
raise WebSocketTimeoutException(message)
except Exception as e:
message = extract_err_message(e)
if isinstance(message, str) and "timed out" in message:
raise WebSocketTimeoutException(message)
else:
raise
|
