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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
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()))
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
class BaseWaiter:
def wakeup(self):
self._do_write()
def wait(self, timeout=None):
if timeout is not None:
ready, _, _ = select([self], [], [], timeout)
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 __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, read_fd, write_fd):
self.read_fd = read_fd
self.write_fd = write_fd
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 __repr__(self):
return "PipeWaiter(%r, %r)" % (self.read_fd, self.write_fd)
def selectable_waiter():
return PipeWaiter(*os.pipe())
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