/usr/share/pyshared/flup/server/singleserver.py is in python-flup 1.0.2-4.
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 | # Copyright (c) 2005 Allan Saddi <allan@saddi.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id$
__author__ = 'Allan Saddi <allan@saddi.com>'
__version__ = '$Revision$'
import sys
import socket
import select
import signal
import errno
try:
import fcntl
except ImportError:
def setCloseOnExec(sock):
pass
else:
def setCloseOnExec(sock):
fcntl.fcntl(sock.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
__all__ = ['SingleServer']
class SingleServer(object):
def __init__(self, jobClass=None, jobArgs=(), **kw):
self._jobClass = jobClass
self._jobArgs = jobArgs
def run(self, sock, timeout=1.0):
"""
The main loop. Pass a socket that is ready to accept() client
connections. Return value will be True or False indiciating whether
or not the loop was exited due to SIGHUP.
"""
# Set up signal handlers.
self._keepGoing = True
self._hupReceived = False
# Might need to revisit this?
if not sys.platform.startswith('win'):
self._installSignalHandlers()
# Set close-on-exec
setCloseOnExec(sock)
# Main loop.
while self._keepGoing:
try:
r, w, e = select.select([sock], [], [], timeout)
except select.error, e:
if e[0] == errno.EINTR:
continue
raise
if r:
try:
clientSock, addr = sock.accept()
except socket.error, e:
if e[0] in (errno.EINTR, errno.EAGAIN):
continue
raise
setCloseOnExec(clientSock)
if not self._isClientAllowed(addr):
clientSock.close()
continue
# Hand off to Connection.
conn = self._jobClass(clientSock, addr, *self._jobArgs)
conn.run()
self._mainloopPeriodic()
# Restore signal handlers.
self._restoreSignalHandlers()
# Return bool based on whether or not SIGHUP was received.
return self._hupReceived
def _mainloopPeriodic(self):
"""
Called with just about each iteration of the main loop. Meant to
be overridden.
"""
pass
def _exit(self, reload=False):
"""
Protected convenience method for subclasses to force an exit. Not
really thread-safe, which is why it isn't public.
"""
if self._keepGoing:
self._keepGoing = False
self._hupReceived = reload
def _isClientAllowed(self, addr):
"""Override to provide access control."""
return True
# Signal handlers
def _hupHandler(self, signum, frame):
self._hupReceived = True
self._keepGoing = False
def _intHandler(self, signum, frame):
self._keepGoing = False
def _installSignalHandlers(self):
supportedSignals = [signal.SIGINT, signal.SIGTERM]
if hasattr(signal, 'SIGHUP'):
supportedSignals.append(signal.SIGHUP)
self._oldSIGs = [(x,signal.getsignal(x)) for x in supportedSignals]
for sig in supportedSignals:
if hasattr(signal, 'SIGHUP') and sig == signal.SIGHUP:
signal.signal(sig, self._hupHandler)
else:
signal.signal(sig, self._intHandler)
def _restoreSignalHandlers(self):
for signum,handler in self._oldSIGs:
signal.signal(signum, handler)
if __name__ == '__main__':
class TestJob(object):
def __init__(self, sock, addr):
self._sock = sock
self._addr = addr
def run(self):
print "Client connection opened from %s:%d" % self._addr
self._sock.send('Hello World!\n')
self._sock.setblocking(1)
self._sock.recv(1)
self._sock.close()
print "Client connection closed from %s:%d" % self._addr
sock = socket.socket()
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(('', 8080))
sock.listen(socket.SOMAXCONN)
SingleServer(jobClass=TestJob).run(sock)
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