mirror of https://github.com/nocturn9x/giambio.git
91 lines
2.9 KiB
Python
91 lines
2.9 KiB
Python
"""
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Basic abstraction layer for giambio asynchronous sockets
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Copyright (C) 2020 nocturn9x
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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 socket
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from .exceptions import ResourceClosed
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from ._traps import sleep
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try:
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from ssl import SSLWantReadError, SSLWantWriteError
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WantRead = (BlockingIOError, InterruptedError, SSLWantReadError)
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WantWrite = (BlockingIOError, InterruptedError, SSLWantWriteError)
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except ImportError:
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WantRead = (BlockingIOError, InterruptedError)
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WantWrite = (BlockingIOError, InterruptedError)
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class AsyncSocket(object):
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"""Abstraction layer for asynchronous sockets"""
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def __init__(self, sock: socket.socket, loop):
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self.sock = sock
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self.sock.setblocking(False)
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self.loop = loop
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self._closed = False
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async def receive(self, max_size: int):
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"""Receives up to max_size from a socket asynchronously"""
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if self._closed:
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raise ResourceClosed("I/O operation on closed socket")
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self.loop.current_task.status = "I/O"
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return await self.loop.read_sock(self.sock, max_size)
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async def accept(self):
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"""Accepts the socket, completing the 3-step TCP handshake asynchronously"""
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if self._closed:
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raise ResourceClosed("I/O operation on closed socket")
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to_wrap = await self.loop.accept_sock(self.sock)
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return self.loop.wrap_socket(to_wrap[0]), to_wrap[1]
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async def send_all(self, data: bytes):
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"""Sends all data inside the buffer asynchronously until it is empty"""
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if self._closed:
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raise ResourceClosed("I/O operation on closed socket")
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return await self.loop.sock_sendall(self.sock, data)
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async def close(self):
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"""Closes the socket asynchronously"""
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if self._closed:
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raise ResourceClosed("I/O operation on closed socket")
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await sleep(0) # Give the scheduler the time to unregister the socket first
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await self.loop.close_sock(self.sock)
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self._closed = True
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async def connect(self, addr: tuple):
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"""Connects the socket to an endpoint"""
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if self._closed:
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raise ResourceClosed("I/O operation on closed socket")
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await self.loop.connect_sock(self.sock, addr)
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def __enter__(self):
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return self.sock.__enter__()
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def __exit__(self, *args):
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return self.sock.__exit__(*args)
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def __repr__(self):
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return f"giambio.socket.AsyncSocket({self.sock}, {self.loop})"
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