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
|
# 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)
from flup.server.threadpool import ThreadPool
__all__ = ['ThreadedServer']
class ThreadedServer(object):
def __init__(self, jobClass=None, jobArgs=(), **kw):
self._jobClass = jobClass
self._jobArgs = jobArgs
self._threadPool = ThreadPool(**kw)
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)
if not self._threadPool.addJob(conn, allowQueuing=False):
# No thread left, immediately close the socket to hopefully
# indicate to the web server that we're at our limit...
# and to prevent having too many opened (and useless)
# files.
clientSock.close()
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)
ThreadedServer(maxThreads=10, jobClass=TestJob).run(sock)
|