mirror of https://github.com/nocturn9x/giambio.git
109 lines
3.3 KiB
Python
109 lines
3.3 KiB
Python
""" Basic abstraction layer for giambio asynchronous sockets
|
|
|
|
Copyright (C) 2020 nocturn9x
|
|
|
|
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.
|
|
"""
|
|
|
|
import socket
|
|
from giambio.run import get_event_loop
|
|
from giambio.exceptions import ResourceClosed
|
|
|
|
|
|
class AsyncSocket:
|
|
"""
|
|
Abstraction layer for asynchronous sockets
|
|
"""
|
|
|
|
def __init__(self, sock: socket.socket):
|
|
self.sock = sock
|
|
self.loop = get_event_loop()
|
|
self._closed = False
|
|
self.sock.setblocking(False)
|
|
|
|
async def receive(self, max_size: int):
|
|
"""
|
|
Receives up to max_size bytes from a socket asynchronously
|
|
"""
|
|
|
|
if self._closed:
|
|
raise ResourceClosed("I/O operation on closed socket")
|
|
return await self.loop.read_sock(self.sock, max_size)
|
|
|
|
async def accept(self):
|
|
"""
|
|
Accepts the socket, completing the 3-step TCP handshake asynchronously
|
|
"""
|
|
|
|
if self._closed:
|
|
raise ResourceClosed("I/O operation on closed socket")
|
|
to_wrap = await self.loop.accept_sock(self.sock)
|
|
return wrap_socket(to_wrap[0]), to_wrap[1]
|
|
|
|
async def send_all(self, data: bytes):
|
|
"""
|
|
Sends all data inside the buffer asynchronously until it is empty
|
|
"""
|
|
|
|
if self._closed:
|
|
raise ResourceClosed("I/O operation on closed socket")
|
|
return await self.loop.sock_sendall(self.sock, data)
|
|
|
|
async def close(self):
|
|
"""
|
|
Closes the socket asynchronously
|
|
"""
|
|
|
|
if self._closed:
|
|
raise ResourceClosed("I/O operation on closed socket")
|
|
await self.loop.close_sock(self.sock)
|
|
self._closed = True
|
|
|
|
async def connect(self, addr: tuple):
|
|
"""
|
|
Connects the socket to an endpoint
|
|
"""
|
|
|
|
if self._closed:
|
|
raise ResourceClosed("I/O operation on closed socket")
|
|
await self.loop.connect_sock(self.sock, addr)
|
|
|
|
def __del__(self):
|
|
"""
|
|
Implements the destructor for the async socket,
|
|
notifying the event loop that the socket must not
|
|
be listened for anymore. This avoids the loop
|
|
blocking forever on trying to read from a socket
|
|
that's gone out of scope without being closed
|
|
"""
|
|
|
|
if not self._closed and self.loop.selector.get_map() and self.sock in self.loop.selector.get_map():
|
|
self.loop.selector.unregister(self.sock)
|
|
|
|
async def __aenter__(self):
|
|
return self
|
|
|
|
async def __aexit__(self, *_):
|
|
await self.close()
|
|
|
|
def __repr__(self):
|
|
return f"giambio.socket.AsyncSocket({self.sock}, {self.loop})"
|
|
|
|
|
|
def wrap_socket(sock: socket.socket) -> AsyncSocket:
|
|
"""
|
|
Wraps a standard socket into an async socket
|
|
"""
|
|
|
|
return AsyncSocket(sock)
|