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|
##
# Copyright (c) 2013 Yury Selivanov
# License: Apache 2.0
##
"""Greensocket (non-blocking) for asyncio.
Use ``greenio.socket`` in the same way as you would use stdlib's
``socket.socket`` in ``greenio.task`` tasks or coroutines invoked
from them.
"""
from __future__ import absolute_import
from greenio import asyncio
from socket import error, SOCK_STREAM
from socket import socket as std_socket
from . import yield_from
from . import _GreenLoopMixin
class socket:
def __init__(self, *args, **kwargs):
_from_sock = kwargs.pop('_from_sock', None)
if _from_sock:
own_sock = None
self._sock = _from_sock
else:
own_sock = std_socket(*args, **kwargs)
self._sock = own_sock
try:
self._sock.setblocking(False)
self._loop = asyncio.get_event_loop()
assert isinstance(self._loop, _GreenLoopMixin), \
'greenio event loop is required'
except:
if own_sock is not None:
# An unexpected error has occurred. Close the
# socket object if it was created in __init__.
own_sock.close()
raise
@classmethod
def from_socket(cls, sock):
return cls(_from_sock=sock)
@property
def family(self):
return self._sock.family
@property
def type(self):
return self._sock.type
@property
def proto(self):
return self._sock.proto
def _proxy(attr):
def proxy(self, *args, **kwargs):
meth = getattr(self._sock, attr)
return meth(*args, **kwargs)
proxy.__name__ = attr
proxy.__qualname__ = attr
proxy.__doc__ = getattr(getattr(std_socket, attr), '__doc__', None)
return proxy
def _copydoc(func):
func.__doc__ = getattr(
getattr(std_socket, func.__name__), '__doc__', None)
return func
@_copydoc
def setblocking(self, flag):
if flag:
raise error('greenio.socket does not support blocking mode')
@_copydoc
def recv(self, nbytes):
fut = self._loop.sock_recv(self._sock, nbytes)
yield_from(fut)
return fut.result()
@_copydoc
def connect(self, addr):
fut = self._loop.sock_connect(self._sock, addr)
yield_from(fut)
return fut.result()
@_copydoc
def sendall(self, data, flags=0):
assert not flags
fut = self._loop.sock_sendall(self._sock, data)
yield_from(fut)
return fut.result()
@_copydoc
def send(self, data, flags=0):
self.sendall(data, flags)
return len(data)
@_copydoc
def accept(self):
fut = self._loop.sock_accept(self._sock)
yield_from(fut)
sock, addr = fut.result()
return self.__class__.from_socket(sock), addr
@_copydoc
def makefile(self, mode, *args, **kwargs):
if mode == 'rb':
return ReadFile(self._loop, self._sock)
elif mode == 'wb':
return WriteFile(self._loop, self._sock)
raise NotImplementedError
bind = _proxy('bind')
listen = _proxy('listen')
getsockname = _proxy('getsockname')
getpeername = _proxy('getpeername')
gettimeout = _proxy('gettimeout')
getsockopt = _proxy('getsockopt')
setsockopt = _proxy('setsockopt')
fileno = _proxy('fileno')
# socket.detach() was added in Python 3.2
if hasattr(std_socket, 'detach'):
detach = _proxy('detach')
close = _proxy('close')
shutdown = _proxy('shutdown')
del _copydoc, _proxy
class ReadFile:
def __init__(self, loop, sock):
self._loop = loop
self._sock = sock
self._buf = bytearray()
def read(self, size):
while 1:
if size <= len(self._buf):
data = self._buf[:size]
del self._buf[:size]
return data
fut = self._loop.sock_recv(self._sock, size - len(self._buf))
yield_from(fut)
res = fut.result()
self._buf.extend(res)
if size <= len(self._buf):
data = self._buf[:size]
del self._buf[:size]
return data
else:
data = self._buf[:]
del self._buf[:]
return data
def close(self):
pass
class WriteFile:
def __init__(self, loop, sock):
self._loop = loop
self._sock = sock
def write(self, data):
fut = self._loop.sock_sendall(self._sock, data)
yield_from(fut)
return fut.result()
def flush(self):
pass
def close(self):
pass
def create_connection(address, timeout=None):
loop = asyncio.get_event_loop()
host, port = address
rslt = yield_from(
loop.getaddrinfo(host, port, family=0, type=SOCK_STREAM))
for res in rslt:
af, socktype, proto, canonname, sa = res
sock = None
try:
sock = socket(af, socktype, proto)
sock.connect(sa)
return sock
except ConnectionError:
if sock:
sock.close()
raise error('unable to connect to {!r}'.format(address))
|
