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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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 sys
import errno
import time
from logging import getLogger
log = getLogger("qpid.messaging")
try:
set = set
except NameError:
from sets import Set as set
try:
from socket import SHUT_RDWR
except ImportError:
SHUT_RDWR = 2
try:
from traceback import format_exc
except ImportError:
import traceback
def format_exc():
return "".join(traceback.format_exception(*sys.exc_info()))
# QPID-5588: prefer poll() to select(), as it allows file descriptors with
# values > FD_SETSIZE
import select as _select_mod
try:
# QPID-5790: unless eventlet/greenthreads have monkey-patched the select
# module, as to date poll() is not properly supported by eventlet
import eventlet
_is_patched = eventlet.patcher.is_monkey_patched("select")
except ImportError:
_is_patched = False
if hasattr(_select_mod, "poll") and not _is_patched:
from select import error as SelectError
def select(rlist, wlist, xlist, timeout=None):
fd_count = 0
rset = set(rlist)
wset = set(wlist)
xset = set(xlist)
if timeout:
# select expects seconds, poll milliseconds
timeout = float(timeout) * 1000
poller = _select_mod.poll()
rwset = rset.intersection(wset)
for rw in rwset:
poller.register(rw, (_select_mod.POLLIN | _select_mod.POLLOUT))
fd_count += 1
for ro in rset.difference(rwset):
poller.register(ro, _select_mod.POLLIN)
fd_count += 1
for wo in wset.difference(rwset):
poller.register(wo, _select_mod.POLLOUT)
fd_count += 1
for x in xset:
poller.register(x, _select_mod.POLLPRI)
fd_count += 1
# select returns the objects passed in, but poll gives us back only the
# integer fds. Maintain a map to get back:
fd_map = {}
for o in rset | wset | xset:
if hasattr(o, "fileno"):
fd_map[o.fileno()] = o
log.debug("poll(%d fds, timeout=%s)", fd_count, timeout)
active = poller.poll(timeout)
log.debug("poll() returned %s fds", len(active))
rfds = []
wfds = []
xfds = []
# set the error conditions so we do a read(), which will report the error
rflags = (_select_mod.POLLIN | _select_mod.POLLERR | _select_mod.POLLHUP)
for fds, flags in active:
if fds in fd_map:
fds = fd_map[fds]
if (flags & rflags):
rfds.append(fds)
if (flags & _select_mod.POLLOUT):
wfds.append(fds)
if (flags & _select_mod.POLLPRI):
xfds.append(fds)
return (rfds, wfds, xfds)
else:
if tuple(sys.version_info[0:2]) < (2, 4):
from select import select as old_select
def select(rlist, wlist, xlist, timeout=None):
return old_select(list(rlist), list(wlist), list(xlist), timeout)
else:
from select import select
from select import error as SelectError
class BaseWaiter:
def wakeup(self):
self._do_write()
def wait(self, timeout=None):
start = time.time()
if timeout is not None:
ready = False
while timeout > 0:
try:
ready, _, _ = select([self], [], [], timeout)
break
except SelectError, e:
if e[0] == errno.EINTR:
elapsed = time.time() - start
timeout = timeout - elapsed
else:
raise e
else:
ready = True
if ready:
self._do_read()
return True
else:
return False
def reading(self):
return True
def readable(self):
self._do_read()
if sys.platform in ('win32', 'cygwin'):
import socket
class SockWaiter(BaseWaiter):
def __init__(self, read_sock, write_sock):
self.read_sock = read_sock
self.write_sock = write_sock
def _do_write(self):
self.write_sock.send("\0")
def _do_read(self):
self.read_sock.recv(65536)
def fileno(self):
return self.read_sock.fileno()
def close(self):
if self.write_sock is not None:
self.write_sock.close()
self.write_sock = None
self.read_sock.close()
self.read_sock = None
def __del__(self):
self.close()
def __repr__(self):
return "SockWaiter(%r, %r)" % (self.read_sock, self.write_sock)
def selectable_waiter():
listener = socket.socket()
listener.bind(('', 0))
listener.listen(1)
_, port = listener.getsockname()
write_sock = socket.socket()
write_sock.connect(("127.0.0.1", port))
read_sock, _ = listener.accept()
listener.close()
return SockWaiter(read_sock, write_sock)
else:
import os
class PipeWaiter(BaseWaiter):
def __init__(self):
self.read_fd, self.write_fd = os.pipe()
def _do_write(self):
os.write(self.write_fd, "\0")
def _do_read(self):
os.read(self.read_fd, 65536)
def fileno(self):
return self.read_fd
def close(self):
if self.write_fd is not None:
os.close(self.write_fd)
self.write_fd = None
os.close(self.read_fd)
self.read_fd = None
def __del__(self):
self.close()
def __repr__(self):
return "PipeWaiter(%r, %r)" % (self.read_fd, self.write_fd)
def selectable_waiter():
return PipeWaiter()
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