/usr/share/pyshared/eventlet/greenio.py is in python-eventlet 0.9.16-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 | from eventlet.support import get_errno
from eventlet.hubs import trampoline
BUFFER_SIZE = 4096
import errno
import os
import socket
from socket import socket as _original_socket
import sys
import time
import warnings
__all__ = ['GreenSocket', 'GreenPipe', 'shutdown_safe']
CONNECT_ERR = set((errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK))
CONNECT_SUCCESS = set((0, errno.EISCONN))
if sys.platform[:3]=="win":
CONNECT_ERR.add(errno.WSAEINVAL) # Bug 67
# Emulate _fileobject class in 3.x implementation
# Eventually this internal socket structure could be replaced with makefile calls.
try:
_fileobject = socket._fileobject
except AttributeError:
def _fileobject(sock, *args, **kwargs):
return _original_socket.makefile(sock, *args, **kwargs)
def socket_connect(descriptor, address):
"""
Attempts to connect to the address, returns the descriptor if it succeeds,
returns None if it needs to trampoline, and raises any exceptions.
"""
err = descriptor.connect_ex(address)
if err in CONNECT_ERR:
return None
if err not in CONNECT_SUCCESS:
raise socket.error(err, errno.errorcode[err])
return descriptor
def socket_checkerr(descriptor):
err = descriptor.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
if err not in CONNECT_SUCCESS:
raise socket.error(err, errno.errorcode[err])
def socket_accept(descriptor):
"""
Attempts to accept() on the descriptor, returns a client,address tuple
if it succeeds; returns None if it needs to trampoline, and raises
any exceptions.
"""
try:
return descriptor.accept()
except socket.error, e:
if get_errno(e) == errno.EWOULDBLOCK:
return None
raise
if sys.platform[:3]=="win":
# winsock sometimes throws ENOTCONN
SOCKET_BLOCKING = set((errno.EWOULDBLOCK,))
SOCKET_CLOSED = set((errno.ECONNRESET, errno.ENOTCONN, errno.ESHUTDOWN))
else:
# oddly, on linux/darwin, an unconnected socket is expected to block,
# so we treat ENOTCONN the same as EWOULDBLOCK
SOCKET_BLOCKING = set((errno.EWOULDBLOCK, errno.ENOTCONN))
SOCKET_CLOSED = set((errno.ECONNRESET, errno.ESHUTDOWN, errno.EPIPE))
def set_nonblocking(fd):
"""
Sets the descriptor to be nonblocking. Works on many file-like
objects as well as sockets. Only sockets can be nonblocking on
Windows, however.
"""
try:
setblocking = fd.setblocking
except AttributeError:
# fd has no setblocking() method. It could be that this version of
# Python predates socket.setblocking(). In that case, we can still set
# the flag "by hand" on the underlying OS fileno using the fcntl
# module.
try:
import fcntl
except ImportError:
# Whoops, Windows has no fcntl module. This might not be a socket
# at all, but rather a file-like object with no setblocking()
# method. In particular, on Windows, pipes don't support
# non-blocking I/O and therefore don't have that method. Which
# means fcntl wouldn't help even if we could load it.
raise NotImplementedError("set_nonblocking() on a file object "
"with no setblocking() method "
"(Windows pipes don't support non-blocking I/O)")
# We managed to import fcntl.
fileno = fd.fileno()
flags = fcntl.fcntl(fileno, fcntl.F_GETFL)
fcntl.fcntl(fileno, fcntl.F_SETFL, flags | os.O_NONBLOCK)
else:
# socket supports setblocking()
setblocking(0)
try:
from socket import _GLOBAL_DEFAULT_TIMEOUT
except ImportError:
_GLOBAL_DEFAULT_TIMEOUT = object()
class GreenSocket(object):
"""
Green version of socket.socket class, that is intended to be 100%
API-compatible.
"""
def __init__(self, family_or_realsock=socket.AF_INET, *args, **kwargs):
if isinstance(family_or_realsock, (int, long)):
fd = _original_socket(family_or_realsock, *args, **kwargs)
else:
fd = family_or_realsock
assert not args, args
assert not kwargs, kwargs
# import timeout from other socket, if it was there
try:
self._timeout = fd.gettimeout() or socket.getdefaulttimeout()
except AttributeError:
self._timeout = socket.getdefaulttimeout()
set_nonblocking(fd)
self.fd = fd
# when client calls setblocking(0) or settimeout(0) the socket must
# act non-blocking
self.act_non_blocking = False
@property
def _sock(self):
return self
#forward unknown attibutes to fd
# cache the value for future use.
# I do not see any simple attribute which could be changed
# so caching everything in self is fine,
# If we find such attributes - only attributes having __get__ might be cahed.
# For now - I do not want to complicate it.
def __getattr__(self, name):
attr = getattr(self.fd, name)
setattr(self, name, attr)
return attr
def accept(self):
if self.act_non_blocking:
return self.fd.accept()
fd = self.fd
while True:
res = socket_accept(fd)
if res is not None:
client, addr = res
set_nonblocking(client)
return type(self)(client), addr
trampoline(fd, read=True, timeout=self.gettimeout(),
timeout_exc=socket.timeout("timed out"))
def connect(self, address):
if self.act_non_blocking:
return self.fd.connect(address)
fd = self.fd
if self.gettimeout() is None:
while not socket_connect(fd, address):
trampoline(fd, write=True)
socket_checkerr(fd)
else:
end = time.time() + self.gettimeout()
while True:
if socket_connect(fd, address):
return
if time.time() >= end:
raise socket.timeout("timed out")
try:
trampoline(fd, write=True, timeout=end-time.time(),
timeout_exc=socket.timeout("timed out"))
except socket.timeout, e:
try:
if socket_connect(fd, address):
return
raise e
except:
raise e
socket_checkerr(fd)
def connect_ex(self, address):
if self.act_non_blocking:
return self.fd.connect_ex(address)
fd = self.fd
if self.gettimeout() is None:
while not socket_connect(fd, address):
try:
trampoline(fd, write=True)
socket_checkerr(fd)
except socket.error, ex:
return get_errno(ex)
else:
end = time.time() + self.gettimeout()
while True:
try:
if socket_connect(fd, address):
return 0
if time.time() >= end:
raise socket.timeout(errno.EAGAIN)
try:
trampoline(fd, write=True, timeout=end-time.time(),
timeout_exc=socket.timeout(errno.EAGAIN))
except socket.timeout, e:
try:
if socket_connect(fd, address):
return
raise e
except:
raise e
socket_checkerr(fd)
except socket.error, ex:
return get_errno(ex)
def dup(self, *args, **kw):
sock = self.fd.dup(*args, **kw)
set_nonblocking(sock)
newsock = type(self)(sock)
newsock.settimeout(self.gettimeout())
return newsock
def makefile(self, *args, **kw):
return _fileobject(self.dup(), *args, **kw)
def makeGreenFile(self, *args, **kw):
warnings.warn("makeGreenFile has been deprecated, please use "
"makefile instead", DeprecationWarning, stacklevel=2)
return self.makefile(*args, **kw)
def _read_io(self, fd, f, *args, **kwargs):
if self.act_non_blocking:
return f(*args, **kwargs)
while True:
try:
return f(*args, **kwargs)
except socket.error, e:
if get_errno(e) in SOCKET_BLOCKING:
pass
# XXX -- Why does recv() do this?
elif f == fd.recv and get_errno(e) in SOCKET_CLOSED:
return ''
else:
raise
try:
trampoline(fd,
read=True,
timeout=self.gettimeout(),
timeout_exc=socket.timeout("timed out"))
except socket.timeout, e:
# Try one last time to see if the timeout is 'real'
try:
return f(*args, **kwargs)
except:
raise e
def recv(self, buflen, flags=0):
return self._read_io(self.fd, self.fd.recv, buflen, flags)
def recvfrom(self, *args):
return self._read_io(self.fd, self.fd.recvfrom, *args)
def recvfrom_into(self, *args):
return self._read_io(self.fd, self.fd.recvfrom_into, *args)
def recv_into(self, *args):
return self._read_io(self.fd, self.fd.recv_into, *args)
def send(self, data, flags=0):
fd = self.fd
if self.act_non_blocking:
return fd.send(data, flags)
# blocking socket behavior - sends all, blocks if the buffer is full
total_sent = 0
len_data = len(data)
while True:
try:
total_sent += fd.send(data[total_sent:], flags)
except socket.error, e:
if get_errno(e) not in SOCKET_BLOCKING:
raise
if total_sent == len_data:
break
try:
trampoline(fd, write=True, timeout=self.gettimeout(),
timeout_exc=socket.timeout("timed out"))
except socket.timeout, e:
# Try one last time to see if the timeout is 'real'
try:
total_sent += fd.send(data[total_sent:], flags)
except:
raise e
return total_sent
def sendall(self, data, flags=0):
tail = self.send(data, flags)
len_data = len(data)
while tail < len_data:
tail += self.send(data[tail:], flags)
def sendto(self, *args):
fd = self.fd
if self.act_non_blocking:
return fd.sendto(*args)
while True:
try:
return fd.sendto(*args)
except socket.error, e:
if get_errno(e) in SOCKET_BLOCKING:
pass
else:
raise
try:
trampoline(fd, write=True, timeout=self.gettimeout(),
timeout_exc=socket.timeout("timed out"))
except socket.timeout, e:
# Try one last time to see if the timeout is 'real'
try:
return fd.sendto(*args)
except:
raise e
def setblocking(self, flag):
if flag:
self.act_non_blocking = False
self._timeout = None
else:
self.act_non_blocking = True
self._timeout = 0.0
def settimeout(self, howlong):
if howlong is None or howlong == _GLOBAL_DEFAULT_TIMEOUT:
self.setblocking(True)
return
try:
f = howlong.__float__
except AttributeError:
raise TypeError('a float is required')
howlong = f()
if howlong < 0.0:
raise ValueError('Timeout value out of range')
if howlong == 0.0:
self.setblocking(howlong)
else:
self._timeout = howlong
def gettimeout(self):
return self._timeout
class _SocketDuckForFd(object):
""" Class implementing all socket method used by _fileobject in cooperative manner using low level os I/O calls."""
def __init__(self, fileno):
self._fileno = fileno
@property
def _sock(self):
return self
def fileno(self):
return self._fileno
def recv(self, buflen):
while True:
try:
data = os.read(self._fileno, buflen)
return data
except OSError, e:
if get_errno(e) != errno.EAGAIN:
raise IOError(*e.args)
trampoline(self, read=True)
def sendall(self, data):
len_data = len(data)
os_write = os.write
fileno = self._fileno
try:
total_sent = os_write(fileno, data)
except OSError, e:
if get_errno(e) != errno.EAGAIN:
raise IOError(*e.args)
total_sent = 0
while total_sent <len_data:
trampoline(self, write=True)
try:
total_sent += os_write(fileno, data[total_sent:])
except OSError, e:
if get_errno(e) != errno. EAGAIN:
raise IOError(*e.args)
def __del__(self):
try:
os.close(self._fileno)
except:
# os.close may fail if __init__ didn't complete (i.e file dscriptor passed to popen was invalid
pass
def __repr__(self):
return "%s:%d" % (self.__class__.__name__, self._fileno)
def _operationOnClosedFile(*args, **kwargs):
raise ValueError("I/O operation on closed file")
class GreenPipe(_fileobject):
"""
GreenPipe is a cooperative replacement for file class.
It will cooperate on pipes. It will block on regular file.
Differneces from file class:
- mode is r/w property. Should re r/o
- encoding property not implemented
- write/writelines will not raise TypeError exception when non-string data is written
it will write str(data) instead
- Universal new lines are not supported and newlines property not implementeded
- file argument can be descriptor, file name or file object.
"""
def __init__(self, f, mode='r', bufsize=-1):
if not isinstance(f, (basestring, int, file)):
raise TypeError('f(ile) should be int, str, unicode or file, not %r' % f)
if isinstance(f, basestring):
f = open(f, mode, 0)
if isinstance(f, int):
fileno = f
self._name = "<fd:%d>" % fileno
else:
fileno = os.dup(f.fileno())
self._name = f.name
if f.mode != mode:
raise ValueError('file.mode %r does not match mode parameter %r' % (f.mode, mode))
self._name = f.name
f.close()
super(GreenPipe, self).__init__(_SocketDuckForFd(fileno), mode, bufsize)
set_nonblocking(self)
self.softspace = 0
@property
def name(self): return self._name
def __repr__(self):
return "<%s %s %r, mode %r at 0x%x>" % (
self.closed and 'closed' or 'open',
self.__class__.__name__,
self.name,
self.mode,
(id(self) < 0) and (sys.maxint +id(self)) or id(self))
def close(self):
super(GreenPipe, self).close()
for method in ['fileno', 'flush', 'isatty', 'next', 'read', 'readinto',
'readline', 'readlines', 'seek', 'tell', 'truncate',
'write', 'xreadlines', '__iter__', 'writelines']:
setattr(self, method, _operationOnClosedFile)
if getattr(file, '__enter__', None):
def __enter__(self):
return self
def __exit__(self, *args):
self.close()
def xreadlines(self, buffer):
return iterator(self)
def readinto(self, buf):
data = self.read(len(buf)) #FIXME could it be done without allocating intermediate?
n = len(data)
try:
buf[:n] = data
except TypeError, err:
if not isinstance(buf, array.array):
raise err
buf[:n] = array.array('c', data)
return n
def _get_readahead_len(self):
try:
return len(self._rbuf.getvalue()) # StringIO in 2.5
except AttributeError:
return len(self._rbuf) # str in 2.4
def _clear_readahead_buf(self):
len = self._get_readahead_len()
if len>0:
self.read(len)
def tell(self):
self.flush()
try:
return os.lseek(self.fileno(), 0, 1) - self._get_readahead_len()
except OSError, e:
raise IOError(*e.args)
def seek(self, offset, whence=0):
self.flush()
if whence == 1 and offset==0: # tell synonym
return self.tell()
if whence == 1: # adjust offset by what is read ahead
offset -= self.get_readahead_len()
try:
rv = os.lseek(self.fileno(), offset, whence)
except OSError, e:
raise IOError(*e.args)
else:
self._clear_readahead_buf()
return rv
if getattr(file, "truncate", None): # not all OSes implement truncate
def truncate(self, size=-1):
self.flush()
if size ==-1:
size = self.tell()
try:
rv = os.ftruncate(self.fileno(), size)
except OSError, e:
raise IOError(*e.args)
else:
self.seek(size) # move position&clear buffer
return rv
def isatty(self):
try:
return os.isatty(self.fileno())
except OSError, e:
raise IOError(*e.args)
# import SSL module here so we can refer to greenio.SSL.exceptionclass
try:
from OpenSSL import SSL
except ImportError:
# pyOpenSSL not installed, define exceptions anyway for convenience
class SSL(object):
class WantWriteError(object):
pass
class WantReadError(object):
pass
class ZeroReturnError(object):
pass
class SysCallError(object):
pass
def shutdown_safe(sock):
""" Shuts down the socket. This is a convenience method for
code that wants to gracefully handle regular sockets, SSL.Connection
sockets from PyOpenSSL and ssl.SSLSocket objects from Python 2.6
interchangeably. Both types of ssl socket require a shutdown() before
close, but they have different arity on their shutdown method.
Regular sockets don't need a shutdown before close, but it doesn't hurt.
"""
try:
try:
# socket, ssl.SSLSocket
return sock.shutdown(socket.SHUT_RDWR)
except TypeError:
# SSL.Connection
return sock.shutdown()
except socket.error, e:
# we don't care if the socket is already closed;
# this will often be the case in an http server context
if get_errno(e) != errno.ENOTCONN:
raise
|