a0f9acddaa
Also keep two nio clients internally: one for loop-syncing, one for the rest; since they can't handle more than one talk at a time.
119 lines
3.2 KiB
Python
119 lines
3.2 KiB
Python
# Copyright 2019 miruka
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# This file is part of harmonyqml, licensed under GPLv3.
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import logging
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import socket
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import ssl
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import time
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from threading import Lock
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from typing import Callable, Optional, Tuple
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from uuid import UUID
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import nio
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import nio.responses as nr
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OptSock = Optional[ssl.SSLSocket]
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NioRequestFunc = Callable[..., Tuple[UUID, bytes]]
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class NioErrorResponse(Exception):
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def __init__(self, response: nr.ErrorResponse) -> None:
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self.response = response
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super().__init__(str(response))
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class NetworkManager:
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http_retry_codes = {408, 429, 500, 502, 503, 504, 507}
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def __init__(self, host: str, port: int, nio_client: nio.client.HttpClient
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) -> None:
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self.host = host
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self.port = port
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self.nio = nio_client
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self._ssl_context: ssl.SSLContext = ssl.create_default_context()
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self._ssl_session: Optional[ssl.SSLSession] = None
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self._lock: Lock = Lock()
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def _get_socket(self) -> ssl.SSLSocket:
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sock = self._ssl_context.wrap_socket( # type: ignore
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socket.create_connection((self.host, self.port)),
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server_hostname = self.host,
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session = self._ssl_session,
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)
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self._ssl_session = self._ssl_session or sock.session
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return sock
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@staticmethod
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def _close_socket(sock: socket.socket) -> None:
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sock.shutdown(how=socket.SHUT_RDWR)
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sock.close()
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def read(self, with_sock: OptSock = None) -> nr.Response:
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sock = with_sock or self._get_socket()
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response = None
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while not response:
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left_to_send = self.nio.data_to_send()
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if left_to_send:
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self.write(left_to_send, sock)
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self.nio.receive(sock.recv(4096))
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response = self.nio.next_response()
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if isinstance(response, nr.ErrorResponse):
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raise NioErrorResponse(response)
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if not with_sock:
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self._close_socket(sock)
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return response
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def write(self, data: bytes, with_sock: OptSock = None) -> None:
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if not data:
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return
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sock = with_sock or self._get_socket()
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sock.sendall(data)
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if not with_sock:
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self._close_socket(sock)
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def talk(self, nio_func: NioRequestFunc, *args, **kwargs) -> nr.Response:
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with self._lock:
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while True:
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to_send = nio_func(*args, **kwargs)[1]
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sock = self._get_socket()
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try:
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self.write(to_send, sock)
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response = self.read(sock)
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except NioErrorResponse as err:
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logging.error("bad read for %s: %s", nio_func, err)
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self._close_socket(sock)
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if self._should_abort_talk(err):
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logging.error("aborting talk")
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break
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time.sleep(10)
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else:
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break
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self._close_socket(sock)
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return response
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def _should_abort_talk(self, err: NioErrorResponse) -> bool:
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if err.response.status_code in self.http_retry_codes:
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return False
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return True
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