483 lines
17 KiB
Python
483 lines
17 KiB
Python
import errno
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import os
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import socket
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import sys
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import time
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import warnings
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import eventlet
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from eventlet.hubs import trampoline, notify_opened, IOClosed
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from eventlet.support import get_errno, six
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__all__ = [
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'GreenSocket', '_GLOBAL_DEFAULT_TIMEOUT', 'set_nonblocking',
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'SOCKET_CLOSED', 'CONNECT_ERR', 'CONNECT_SUCCESS',
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'shutdown_safe', 'SSL',
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]
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BUFFER_SIZE = 4096
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CONNECT_ERR = set((errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK))
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CONNECT_SUCCESS = set((0, errno.EISCONN))
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if sys.platform[:3] == "win":
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CONNECT_ERR.add(errno.WSAEINVAL) # Bug 67
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if six.PY2:
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_python2_fileobject = socket._fileobject
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_original_socket = eventlet.patcher.original('socket').socket
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def socket_connect(descriptor, address):
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"""
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Attempts to connect to the address, returns the descriptor if it succeeds,
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returns None if it needs to trampoline, and raises any exceptions.
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"""
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err = descriptor.connect_ex(address)
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if err in CONNECT_ERR:
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return None
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if err not in CONNECT_SUCCESS:
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raise socket.error(err, errno.errorcode[err])
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return descriptor
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def socket_checkerr(descriptor):
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err = descriptor.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
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if err not in CONNECT_SUCCESS:
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raise socket.error(err, errno.errorcode[err])
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def socket_accept(descriptor):
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"""
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Attempts to accept() on the descriptor, returns a client,address tuple
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if it succeeds; returns None if it needs to trampoline, and raises
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any exceptions.
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"""
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try:
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return descriptor.accept()
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except socket.error as e:
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if get_errno(e) == errno.EWOULDBLOCK:
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return None
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raise
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if sys.platform[:3] == "win":
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# winsock sometimes throws ENOTCONN
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SOCKET_BLOCKING = set((errno.EAGAIN, errno.EWOULDBLOCK,))
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SOCKET_CLOSED = set((errno.ECONNRESET, errno.ENOTCONN, errno.ESHUTDOWN))
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else:
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# oddly, on linux/darwin, an unconnected socket is expected to block,
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# so we treat ENOTCONN the same as EWOULDBLOCK
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SOCKET_BLOCKING = set((errno.EAGAIN, errno.EWOULDBLOCK, errno.ENOTCONN))
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SOCKET_CLOSED = set((errno.ECONNRESET, errno.ESHUTDOWN, errno.EPIPE))
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def set_nonblocking(fd):
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"""
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Sets the descriptor to be nonblocking. Works on many file-like
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objects as well as sockets. Only sockets can be nonblocking on
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Windows, however.
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"""
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try:
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setblocking = fd.setblocking
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except AttributeError:
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# fd has no setblocking() method. It could be that this version of
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# Python predates socket.setblocking(). In that case, we can still set
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# the flag "by hand" on the underlying OS fileno using the fcntl
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# module.
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try:
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import fcntl
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except ImportError:
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# Whoops, Windows has no fcntl module. This might not be a socket
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# at all, but rather a file-like object with no setblocking()
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# method. In particular, on Windows, pipes don't support
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# non-blocking I/O and therefore don't have that method. Which
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# means fcntl wouldn't help even if we could load it.
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raise NotImplementedError("set_nonblocking() on a file object "
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"with no setblocking() method "
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"(Windows pipes don't support non-blocking I/O)")
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# We managed to import fcntl.
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fileno = fd.fileno()
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orig_flags = fcntl.fcntl(fileno, fcntl.F_GETFL)
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new_flags = orig_flags | os.O_NONBLOCK
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if new_flags != orig_flags:
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fcntl.fcntl(fileno, fcntl.F_SETFL, new_flags)
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else:
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# socket supports setblocking()
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setblocking(0)
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try:
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from socket import _GLOBAL_DEFAULT_TIMEOUT
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except ImportError:
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_GLOBAL_DEFAULT_TIMEOUT = object()
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class GreenSocket(object):
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"""
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Green version of socket.socket class, that is intended to be 100%
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API-compatible.
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It also recognizes the keyword parameter, 'set_nonblocking=True'.
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Pass False to indicate that socket is already in non-blocking mode
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to save syscalls.
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"""
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# This placeholder is to prevent __getattr__ from creating an infinite call loop
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fd = None
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def __init__(self, family_or_realsock=socket.AF_INET, *args, **kwargs):
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should_set_nonblocking = kwargs.pop('set_nonblocking', True)
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if isinstance(family_or_realsock, six.integer_types):
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fd = _original_socket(family_or_realsock, *args, **kwargs)
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# Notify the hub that this is a newly-opened socket.
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notify_opened(fd.fileno())
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else:
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fd = family_or_realsock
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# import timeout from other socket, if it was there
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try:
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self._timeout = fd.gettimeout() or socket.getdefaulttimeout()
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except AttributeError:
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self._timeout = socket.getdefaulttimeout()
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if should_set_nonblocking:
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set_nonblocking(fd)
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self.fd = fd
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# when client calls setblocking(0) or settimeout(0) the socket must
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# act non-blocking
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self.act_non_blocking = False
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# Copy some attributes from underlying real socket.
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# This is the easiest way that i found to fix
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# https://bitbucket.org/eventlet/eventlet/issue/136
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# Only `getsockopt` is required to fix that issue, others
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# are just premature optimization to save __getattr__ call.
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self.bind = fd.bind
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self.close = fd.close
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self.fileno = fd.fileno
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self.getsockname = fd.getsockname
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self.getsockopt = fd.getsockopt
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self.listen = fd.listen
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self.setsockopt = fd.setsockopt
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self.shutdown = fd.shutdown
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self._closed = False
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@property
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def _sock(self):
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return self
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if six.PY3:
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def _get_io_refs(self):
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return self.fd._io_refs
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def _set_io_refs(self, value):
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self.fd._io_refs = value
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_io_refs = property(_get_io_refs, _set_io_refs)
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# Forward unknown attributes to fd, cache the value for future use.
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# I do not see any simple attribute which could be changed
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# so caching everything in self is fine.
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# If we find such attributes - only attributes having __get__ might be cached.
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# For now - I do not want to complicate it.
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def __getattr__(self, name):
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if self.fd is None:
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raise AttributeError(name)
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attr = getattr(self.fd, name)
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setattr(self, name, attr)
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return attr
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def _trampoline(self, fd, read=False, write=False, timeout=None, timeout_exc=None):
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""" We need to trampoline via the event hub.
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We catch any signal back from the hub indicating that the operation we
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were waiting on was associated with a filehandle that's since been
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invalidated.
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"""
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if self._closed:
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# If we did any logging, alerting to a second trampoline attempt on a closed
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# socket here would be useful.
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raise IOClosed()
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try:
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return trampoline(fd, read=read, write=write, timeout=timeout,
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timeout_exc=timeout_exc,
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mark_as_closed=self._mark_as_closed)
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except IOClosed:
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# This socket's been obsoleted. De-fang it.
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self._mark_as_closed()
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raise
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def accept(self):
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if self.act_non_blocking:
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return self.fd.accept()
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fd = self.fd
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while True:
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res = socket_accept(fd)
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if res is not None:
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client, addr = res
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set_nonblocking(client)
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return type(self)(client), addr
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self._trampoline(fd, read=True, timeout=self.gettimeout(),
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timeout_exc=socket.timeout("timed out"))
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def _mark_as_closed(self):
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""" Mark this socket as being closed """
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self._closed = True
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def __del__(self):
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# This is in case self.close is not assigned yet (currently the constructor does it)
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close = getattr(self, 'close', None)
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if close is not None:
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close()
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def connect(self, address):
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if self.act_non_blocking:
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return self.fd.connect(address)
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fd = self.fd
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if self.gettimeout() is None:
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while not socket_connect(fd, address):
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try:
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self._trampoline(fd, write=True)
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except IOClosed:
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raise socket.error(errno.EBADFD)
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socket_checkerr(fd)
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else:
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end = time.time() + self.gettimeout()
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while True:
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if socket_connect(fd, address):
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return
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if time.time() >= end:
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raise socket.timeout("timed out")
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try:
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self._trampoline(fd, write=True, timeout=end - time.time(),
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timeout_exc=socket.timeout("timed out"))
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except IOClosed:
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# ... we need some workable errno here.
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raise socket.error(errno.EBADFD)
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socket_checkerr(fd)
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def connect_ex(self, address):
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if self.act_non_blocking:
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return self.fd.connect_ex(address)
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fd = self.fd
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if self.gettimeout() is None:
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while not socket_connect(fd, address):
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try:
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self._trampoline(fd, write=True)
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socket_checkerr(fd)
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except socket.error as ex:
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return get_errno(ex)
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except IOClosed:
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return errno.EBADFD
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else:
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end = time.time() + self.gettimeout()
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while True:
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try:
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if socket_connect(fd, address):
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return 0
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if time.time() >= end:
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raise socket.timeout(errno.EAGAIN)
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self._trampoline(fd, write=True, timeout=end - time.time(),
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timeout_exc=socket.timeout(errno.EAGAIN))
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socket_checkerr(fd)
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except socket.error as ex:
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return get_errno(ex)
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except IOClosed:
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return errno.EBADFD
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def dup(self, *args, **kw):
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sock = self.fd.dup(*args, **kw)
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newsock = type(self)(sock, set_nonblocking=False)
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newsock.settimeout(self.gettimeout())
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return newsock
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if six.PY3:
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def makefile(self, *args, **kwargs):
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return _original_socket.makefile(self, *args, **kwargs)
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else:
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def makefile(self, *args, **kwargs):
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dupped = self.dup()
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res = _python2_fileobject(dupped, *args, **kwargs)
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if hasattr(dupped, "_drop"):
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dupped._drop()
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return res
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def makeGreenFile(self, *args, **kw):
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warnings.warn("makeGreenFile has been deprecated, please use "
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"makefile instead", DeprecationWarning, stacklevel=2)
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return self.makefile(*args, **kw)
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def _read_trampoline(self):
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self._trampoline(
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self.fd,
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read=True,
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timeout=self.gettimeout(),
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timeout_exc=socket.timeout("timed out"))
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def _recv_loop(self, recv_meth, *args):
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fd = self.fd
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if self.act_non_blocking:
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return recv_meth(*args)
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while True:
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try:
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# recv: bufsize=0?
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# recv_into: buffer is empty?
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# This is needed because behind the scenes we use sockets in
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# nonblocking mode and builtin recv* methods. Attempting to read
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# 0 bytes from a nonblocking socket using a builtin recv* method
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# does not raise a timeout exception. Since we're simulating
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# a blocking socket here we need to produce a timeout exception
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# if needed, hence the call to trampoline.
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if not args[0]:
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self._read_trampoline()
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return recv_meth(*args)
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except socket.error as e:
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if get_errno(e) in SOCKET_BLOCKING:
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pass
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elif get_errno(e) in SOCKET_CLOSED:
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return b''
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else:
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raise
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try:
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self._read_trampoline()
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except IOClosed as e:
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# Perhaps we should return '' instead?
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raise EOFError()
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def recv(self, bufsize, flags=0):
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return self._recv_loop(self.fd.recv, bufsize, flags)
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def recvfrom(self, bufsize, flags=0):
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return self._recv_loop(self.fd.recvfrom, bufsize, flags)
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def recv_into(self, buffer, nbytes=0, flags=0):
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return self._recv_loop(self.fd.recv_into, buffer, nbytes, flags)
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def recvfrom_into(self, buffer, nbytes=0, flags=0):
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return self._recv_loop(self.fd.recvfrom_into, buffer, nbytes, flags)
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def _send_loop(self, send_method, data, *args):
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if self.act_non_blocking:
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return send_method(data, *args)
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while 1:
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try:
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return send_method(data, *args)
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except socket.error as e:
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eno = get_errno(e)
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if eno == errno.ENOTCONN or eno not in SOCKET_BLOCKING:
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raise
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try:
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self._trampoline(self.fd, write=True, timeout=self.gettimeout(),
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timeout_exc=socket.timeout("timed out"))
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except IOClosed:
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raise socket.error(errno.ECONNRESET, 'Connection closed by another thread')
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def send(self, data, flags=0):
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return self._send_loop(self.fd.send, data, flags)
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def sendto(self, data, *args):
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return self._send_loop(self.fd.sendto, data, *args)
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def sendall(self, data, flags=0):
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tail = self.send(data, flags)
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len_data = len(data)
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while tail < len_data:
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tail += self.send(data[tail:], flags)
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def setblocking(self, flag):
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if flag:
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self.act_non_blocking = False
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self._timeout = None
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else:
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self.act_non_blocking = True
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self._timeout = 0.0
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def settimeout(self, howlong):
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if howlong is None or howlong == _GLOBAL_DEFAULT_TIMEOUT:
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self.setblocking(True)
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return
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try:
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f = howlong.__float__
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except AttributeError:
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raise TypeError('a float is required')
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howlong = f()
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if howlong < 0.0:
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raise ValueError('Timeout value out of range')
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if howlong == 0.0:
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self.act_non_blocking = True
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self._timeout = 0.0
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else:
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self.act_non_blocking = False
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self._timeout = howlong
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def gettimeout(self):
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return self._timeout
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if "__pypy__" in sys.builtin_module_names:
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def _reuse(self):
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getattr(self.fd, '_sock', self.fd)._reuse()
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def _drop(self):
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getattr(self.fd, '_sock', self.fd)._drop()
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def _operation_on_closed_file(*args, **kwargs):
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raise ValueError("I/O operation on closed file")
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greenpipe_doc = """
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GreenPipe is a cooperative replacement for file class.
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It will cooperate on pipes. It will block on regular file.
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Differneces from file class:
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- mode is r/w property. Should re r/o
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- encoding property not implemented
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- write/writelines will not raise TypeError exception when non-string data is written
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it will write str(data) instead
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- Universal new lines are not supported and newlines property not implementeded
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- file argument can be descriptor, file name or file object.
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"""
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# import SSL module here so we can refer to greenio.SSL.exceptionclass
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try:
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from OpenSSL import SSL
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except ImportError:
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# pyOpenSSL not installed, define exceptions anyway for convenience
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class SSL(object):
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class WantWriteError(Exception):
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pass
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class WantReadError(Exception):
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pass
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|
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class ZeroReturnError(Exception):
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pass
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|
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class SysCallError(Exception):
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pass
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|
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def shutdown_safe(sock):
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""" Shuts down the socket. This is a convenience method for
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code that wants to gracefully handle regular sockets, SSL.Connection
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sockets from PyOpenSSL and ssl.SSLSocket objects from Python 2.6
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interchangeably. Both types of ssl socket require a shutdown() before
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close, but they have different arity on their shutdown method.
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Regular sockets don't need a shutdown before close, but it doesn't hurt.
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"""
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try:
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try:
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# socket, ssl.SSLSocket
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return sock.shutdown(socket.SHUT_RDWR)
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except TypeError:
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# SSL.Connection
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return sock.shutdown()
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except socket.error as e:
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# we don't care if the socket is already closed;
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# this will often be the case in an http server context
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if get_errno(e) not in (errno.ENOTCONN, errno.EBADF):
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raise
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