root / logic / dispatcher.py @ e6209aa2
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1 | d08a5f6f | Vangelis Koukis | #!/usr/bin/env python
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2 | 48130e66 | Georgios Gousios | # Copyright 2011 GRNET S.A. All rights reserved.
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3 | 87ace70f | Vassilios Karakoidas | #
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4 | 48130e66 | Georgios Gousios | # Redistribution and use in source and binary forms, with or without
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5 | 48130e66 | Georgios Gousios | # modification, are permitted provided that the following conditions
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6 | 48130e66 | Georgios Gousios | # are met:
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7 | 7bd50624 | Vassilios Karakoidas | #
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8 | 48130e66 | Georgios Gousios | # 1. Redistributions of source code must retain the above copyright
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9 | 48130e66 | Georgios Gousios | # notice, this list of conditions and the following disclaimer.
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10 | 48130e66 | Georgios Gousios | #
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11 | 48130e66 | Georgios Gousios | # 2. Redistributions in binary form must reproduce the above copyright
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12 | 48130e66 | Georgios Gousios | # notice, this list of conditions and the following disclaimer in the
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13 | 48130e66 | Georgios Gousios | # documentation and/or other materials provided with the distribution.
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14 | 48130e66 | Georgios Gousios | #
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15 | 48130e66 | Georgios Gousios | # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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16 | 48130e66 | Georgios Gousios | # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 | 48130e66 | Georgios Gousios | # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 | 48130e66 | Georgios Gousios | # ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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19 | 48130e66 | Georgios Gousios | # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 | 48130e66 | Georgios Gousios | # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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21 | 48130e66 | Georgios Gousios | # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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22 | 48130e66 | Georgios Gousios | # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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23 | 48130e66 | Georgios Gousios | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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24 | 48130e66 | Georgios Gousios | # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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25 | 48130e66 | Georgios Gousios | # SUCH DAMAGE.
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26 | 48130e66 | Georgios Gousios | #
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27 | 48130e66 | Georgios Gousios | # The views and conclusions contained in the software and documentation are
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28 | 48130e66 | Georgios Gousios | # those of the authors and should not be interpreted as representing official
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29 | 48130e66 | Georgios Gousios | # policies, either expressed or implied, of GRNET S.A.
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30 | 48130e66 | Georgios Gousios | |
31 | 48130e66 | Georgios Gousios | |
32 | e6209aa2 | Georgios Gousios | """ Message queue setup, dispatch and admin
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33 | c183005e | Georgios Gousios |
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34 | 2cd99e7a | Georgios Gousios | This program sets up connections to the queues configured in settings.py
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35 | 2cd99e7a | Georgios Gousios | and implements the message wait and dispatch loops. Actual messages are
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36 | 2cd99e7a | Georgios Gousios | handled in the dispatched functions.
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37 | fcbc5bb3 | Vassilios Karakoidas |
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38 | d08a5f6f | Vangelis Koukis | """
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39 | 87ace70f | Vassilios Karakoidas | |
40 | d08a5f6f | Vangelis Koukis | from django.core.management import setup_environ |
41 | c99fe4c7 | Vassilios Karakoidas | |
42 | d08a5f6f | Vangelis Koukis | import sys |
43 | 86221fd5 | Panos Louridas | import os |
44 | 86221fd5 | Panos Louridas | path = os.path.normpath(os.path.join(os.getcwd(), '..'))
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45 | 86221fd5 | Panos Louridas | sys.path.append(path) |
46 | a5c17ad3 | Dimitris Moraitis | import synnefo.settings as settings |
47 | f13691b3 | Georgios Gousios | from synnefo.logic import log |
48 | d08a5f6f | Vangelis Koukis | |
49 | d08a5f6f | Vangelis Koukis | setup_environ(settings) |
50 | d08a5f6f | Vangelis Koukis | |
51 | da102335 | Georgios Gousios | from amqplib import client_0_8 as amqp |
52 | 8861126f | Georgios Gousios | from signal import signal, SIGINT, SIGTERM |
53 | 23c84263 | Georgios Gousios | |
54 | 8d8ea051 | Georgios Gousios | import time |
55 | 8d8ea051 | Georgios Gousios | import socket |
56 | 4ed2e471 | Georgios Gousios | from daemon import daemon |
57 | 4ed2e471 | Georgios Gousios | |
58 | 4ed2e471 | Georgios Gousios | # Take care of differences between python-daemon versions.
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59 | 4ed2e471 | Georgios Gousios | try:
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60 | 4ed2e471 | Georgios Gousios | from daemon import pidfile |
61 | 4ed2e471 | Georgios Gousios | except:
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62 | 4ed2e471 | Georgios Gousios | from daemon import pidlockfile |
63 | 8d8ea051 | Georgios Gousios | |
64 | 9cb903f9 | Vangelis Koukis | from synnefo.logic import callbacks |
65 | c99fe4c7 | Vassilios Karakoidas | |
66 | 78e2d194 | Georgios Gousios | class Dispatcher: |
67 | 8d8ea051 | Georgios Gousios | |
68 | 78e2d194 | Georgios Gousios | logger = None
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69 | 78e2d194 | Georgios Gousios | chan = None
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70 | 5d081749 | Georgios Gousios | debug = False
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71 | 5d081749 | Georgios Gousios | clienttags = [] |
72 | 78e2d194 | Georgios Gousios | |
73 | 57d0082a | Georgios Gousios | def __init__(self, debug = False): |
74 | f13691b3 | Georgios Gousios | |
75 | 57d0082a | Georgios Gousios | # Initialize logger
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76 | f13691b3 | Georgios Gousios | self.logger = log.get_logger('synnefo.dispatcher') |
77 | 57d0082a | Georgios Gousios | |
78 | 5d081749 | Georgios Gousios | self.debug = debug
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79 | 5d081749 | Georgios Gousios | self._init()
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80 | da102335 | Georgios Gousios | |
81 | 78e2d194 | Georgios Gousios | def wait(self): |
82 | 78e2d194 | Georgios Gousios | while True: |
83 | 78e2d194 | Georgios Gousios | try:
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84 | 78e2d194 | Georgios Gousios | self.chan.wait()
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85 | 78e2d194 | Georgios Gousios | except SystemExit: |
86 | 78e2d194 | Georgios Gousios | break
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87 | cadaffb1 | Georgios Gousios | except amqp.exceptions.AMQPConnectionException:
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88 | cadaffb1 | Georgios Gousios | self.logger.error("Server went away, reconnecting...") |
89 | cadaffb1 | Georgios Gousios | self._init()
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90 | 5d081749 | Georgios Gousios | except socket.error:
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91 | 5d081749 | Georgios Gousios | self.logger.error("Server went away, reconnecting...") |
92 | 5d081749 | Georgios Gousios | self._init()
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93 | 78e2d194 | Georgios Gousios | |
94 | 5d081749 | Georgios Gousios | [self.chan.basic_cancel(clienttag) for clienttag in self.clienttags] |
95 | 78e2d194 | Georgios Gousios | self.chan.connection.close()
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96 | 838239fa | Georgios Gousios | self.chan.close()
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97 | 78e2d194 | Georgios Gousios | |
98 | 5d081749 | Georgios Gousios | def _init(self): |
99 | 57d0082a | Georgios Gousios | self.logger.info("Initializing") |
100 | 57d0082a | Georgios Gousios | |
101 | c183005e | Georgios Gousios | # Connect to RabbitMQ
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102 | 23c84263 | Georgios Gousios | conn = None
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103 | 23c84263 | Georgios Gousios | while conn == None: |
104 | c183005e | Georgios Gousios | self.logger.info("Attempting to connect to %s", |
105 | c183005e | Georgios Gousios | settings.RABBIT_HOST) |
106 | 23c84263 | Georgios Gousios | try:
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107 | 41f2249e | Vangelis Koukis | conn = amqp.Connection(host=settings.RABBIT_HOST, |
108 | 41f2249e | Vangelis Koukis | userid=settings.RABBIT_USERNAME, |
109 | 41f2249e | Vangelis Koukis | password=settings.RABBIT_PASSWORD, |
110 | 41f2249e | Vangelis Koukis | virtual_host=settings.RABBIT_VHOST) |
111 | 23c84263 | Georgios Gousios | except socket.error:
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112 | 23c84263 | Georgios Gousios | time.sleep(1)
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113 | 23c84263 | Georgios Gousios | |
114 | 23c84263 | Georgios Gousios | self.logger.info("Connection succesful, opening channel") |
115 | 23c84263 | Georgios Gousios | self.chan = conn.channel()
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116 | 78e2d194 | Georgios Gousios | |
117 | c183005e | Georgios Gousios | # Declare queues and exchanges
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118 | f30730c0 | Georgios Gousios | for exchange in settings.EXCHANGES: |
119 | c183005e | Georgios Gousios | self.chan.exchange_declare(exchange=exchange, type="topic", |
120 | c183005e | Georgios Gousios | durable=True, auto_delete=False) |
121 | f30730c0 | Georgios Gousios | |
122 | f30730c0 | Georgios Gousios | for queue in settings.QUEUES: |
123 | c183005e | Georgios Gousios | self.chan.queue_declare(queue=queue, durable=True, |
124 | c183005e | Georgios Gousios | exclusive=False, auto_delete=False) |
125 | 78e2d194 | Georgios Gousios | |
126 | 23c84263 | Georgios Gousios | bindings = settings.BINDINGS |
127 | 78e2d194 | Georgios Gousios | |
128 | c183005e | Georgios Gousios | # Special queue for debugging, should not appear in production
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129 | 5d081749 | Georgios Gousios | if self.debug: |
130 | c183005e | Georgios Gousios | self.chan.queue_declare(queue=settings.QUEUE_DEBUG, durable=True, |
131 | c183005e | Georgios Gousios | exclusive=False, auto_delete=False) |
132 | 23c84263 | Georgios Gousios | bindings += settings.BINDINGS_DEBUG |
133 | 78e2d194 | Georgios Gousios | |
134 | c183005e | Georgios Gousios | # Bind queues to handler methods
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135 | 5d081749 | Georgios Gousios | for binding in bindings: |
136 | 78e2d194 | Georgios Gousios | try:
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137 | 9cb903f9 | Vangelis Koukis | callback = getattr(callbacks, binding[3]) |
138 | 23c84263 | Georgios Gousios | except AttributeError: |
139 | 23c84263 | Georgios Gousios | self.logger.error("Cannot find callback %s" % binding[3]) |
140 | c183005e | Georgios Gousios | continue
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141 | 8d8ea051 | Georgios Gousios | |
142 | c183005e | Georgios Gousios | self.chan.queue_bind(queue=binding[0], exchange=binding[1], |
143 | c183005e | Georgios Gousios | routing_key=binding[2])
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144 | 2cd99e7a | Georgios Gousios | tag = self.chan.basic_consume(queue=binding[0], callback=callback) |
145 | 23c84263 | Georgios Gousios | self.logger.debug("Binding %s(%s) to queue %s with handler %s" % |
146 | 23c84263 | Georgios Gousios | (binding[1], binding[2], binding[0], binding[3])) |
147 | 23c84263 | Georgios Gousios | self.clienttags.append(tag)
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148 | 8d8ea051 | Georgios Gousios | |
149 | c183005e | Georgios Gousios | |
150 | c183005e | Georgios Gousios | def _exit_handler(signum, frame): |
151 | c183005e | Georgios Gousios | """"Catch exit signal in children processes."""
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152 | 2cd99e7a | Georgios Gousios | print "%d: Caught signal %d, will raise SystemExit" % (os.getpid(), signum) |
153 | 8d8ea051 | Georgios Gousios | raise SystemExit |
154 | 8d8ea051 | Georgios Gousios | |
155 | c183005e | Georgios Gousios | |
156 | c183005e | Georgios Gousios | def _parent_handler(signum, frame): |
157 | c183005e | Georgios Gousios | """"Catch exit signal in parent process and forward it to children."""
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158 | 8861126f | Georgios Gousios | global children
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159 | 8861126f | Georgios Gousios | print "Caught signal %d, sending kill signal to children" % signum |
160 | 8861126f | Georgios Gousios | [os.kill(pid, SIGTERM) for pid in children] |
161 | 8861126f | Georgios Gousios | |
162 | c183005e | Georgios Gousios | |
163 | 57d0082a | Georgios Gousios | def child(cmdline): |
164 | c183005e | Georgios Gousios | """The context of the child process"""
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165 | c183005e | Georgios Gousios | |
166 | c183005e | Georgios Gousios | # Cmd line argument parsing
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167 | 78e2d194 | Georgios Gousios | (opts, args) = parse_arguments(cmdline) |
168 | 57d0082a | Georgios Gousios | disp = Dispatcher(debug = opts.debug) |
169 | 78e2d194 | Georgios Gousios | |
170 | c183005e | Georgios Gousios | # Start the event loop
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171 | 2cd99e7a | Georgios Gousios | disp.wait() |
172 | 78e2d194 | Georgios Gousios | |
173 | c183005e | Georgios Gousios | |
174 | 78e2d194 | Georgios Gousios | def parse_arguments(args): |
175 | 78e2d194 | Georgios Gousios | from optparse import OptionParser |
176 | 78e2d194 | Georgios Gousios | |
177 | 78e2d194 | Georgios Gousios | parser = OptionParser() |
178 | c183005e | Georgios Gousios | parser.add_option("-d", "--debug", action="store_true", default=False, |
179 | 2cd99e7a | Georgios Gousios | dest="debug", help="Enable debug mode") |
180 | e6209aa2 | Georgios Gousios | parser.add_option("-w", "--workers", default=2, dest="workers", |
181 | e6209aa2 | Georgios Gousios | help="Number of workers to spawn", type="int") |
182 | e6209aa2 | Georgios Gousios | parser.add_option("-p", '--pid-file', dest="pid_file", |
183 | e6209aa2 | Georgios Gousios | default=os.path.join(os.getcwd(), "dispatcher.pid"),
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184 | e6209aa2 | Georgios Gousios | help="Save PID to file (default:%s)" %
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185 | e6209aa2 | Georgios Gousios | os.path.join(os.getcwd(), "dispatcher.pid"))
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186 | 979482ce | Georgios Gousios | parser.add_option("--purge-queues", action="store_true", |
187 | 979482ce | Georgios Gousios | default=False, dest="purge_queues", |
188 | 57d0082a | Georgios Gousios | help="Remove all declared queues (DANGEROUS!)")
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189 | 979482ce | Georgios Gousios | parser.add_option("--purge-exchanges", action="store_true", |
190 | 979482ce | Georgios Gousios | default=False, dest="purge_exchanges", |
191 | 979482ce | Georgios Gousios | help="Remove all exchanges. Implies deleting all queues \
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192 | 979482ce | Georgios Gousios | first (DANGEROUS!)")
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193 | e6209aa2 | Georgios Gousios | parser.add_option("--drain-queue", dest="queue", |
194 | e6209aa2 | Georgios Gousios | help="Strips a queue from all outstanding messages")
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195 | de081774 | Georgios Gousios | |
196 | 78e2d194 | Georgios Gousios | return parser.parse_args(args)
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197 | 78e2d194 | Georgios Gousios | |
198 | f30730c0 | Georgios Gousios | |
199 | 979482ce | Georgios Gousios | def purge_queues() : |
200 | 979482ce | Georgios Gousios | """
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201 | 979482ce | Georgios Gousios | Delete declared queues from RabbitMQ. Use with care!
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202 | 979482ce | Georgios Gousios | """
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203 | 979482ce | Georgios Gousios | conn = get_connection() |
204 | f30730c0 | Georgios Gousios | chan = conn.channel() |
205 | f30730c0 | Georgios Gousios | |
206 | f30730c0 | Georgios Gousios | print "Queues to be deleted: ", settings.QUEUES |
207 | f30730c0 | Georgios Gousios | |
208 | 979482ce | Georgios Gousios | if not get_user_confirmation(): |
209 | f30730c0 | Georgios Gousios | return
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210 | f30730c0 | Georgios Gousios | |
211 | f30730c0 | Georgios Gousios | for queue in settings.QUEUES: |
212 | f30730c0 | Georgios Gousios | try:
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213 | f30730c0 | Georgios Gousios | chan.queue_delete(queue=queue) |
214 | 979482ce | Georgios Gousios | print "Deleting queue %s" % queue |
215 | 979482ce | Georgios Gousios | except amqp.exceptions.AMQPChannelException as e: |
216 | 979482ce | Georgios Gousios | print e.amqp_reply_code, " ", e.amqp_reply_text |
217 | 979482ce | Georgios Gousios | chan = conn.channel() |
218 | 979482ce | Georgios Gousios | |
219 | 979482ce | Georgios Gousios | chan.connection.close() |
220 | 979482ce | Georgios Gousios | |
221 | 979482ce | Georgios Gousios | |
222 | 979482ce | Georgios Gousios | def purge_exchanges(): |
223 | 979482ce | Georgios Gousios | """
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224 | 979482ce | Georgios Gousios | Delete declared exchanges from RabbitMQ, after removing all queues first
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225 | 979482ce | Georgios Gousios | """
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226 | 979482ce | Georgios Gousios | purge_queues() |
227 | 979482ce | Georgios Gousios | |
228 | 979482ce | Georgios Gousios | conn = get_connection() |
229 | 979482ce | Georgios Gousios | chan = conn.channel() |
230 | 979482ce | Georgios Gousios | |
231 | 979482ce | Georgios Gousios | print "Exchnages to be deleted: ", settings.EXCHANGES |
232 | 979482ce | Georgios Gousios | |
233 | 979482ce | Georgios Gousios | if not get_user_confirmation(): |
234 | 979482ce | Georgios Gousios | return
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235 | 979482ce | Georgios Gousios | |
236 | 979482ce | Georgios Gousios | for exchange in settings.EXCHANGES: |
237 | 979482ce | Georgios Gousios | try:
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238 | 979482ce | Georgios Gousios | chan.exchange_delete(exchange=exchange) |
239 | f30730c0 | Georgios Gousios | except amqp.exceptions.AMQPChannelException as e: |
240 | f30730c0 | Georgios Gousios | print e.amqp_reply_code, " ", e.amqp_reply_text |
241 | 979482ce | Georgios Gousios | |
242 | 8861126f | Georgios Gousios | chan.connection.close() |
243 | f30730c0 | Georgios Gousios | |
244 | c183005e | Georgios Gousios | |
245 | 979482ce | Georgios Gousios | def drain_queue(queue): |
246 | 979482ce | Georgios Gousios | """
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247 | 979482ce | Georgios Gousios | Strip a (declared) queue from all outstanding messages
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248 | 979482ce | Georgios Gousios | """
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249 | 979482ce | Georgios Gousios | if not queue: |
250 | 979482ce | Georgios Gousios | return
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251 | 979482ce | Georgios Gousios | |
252 | 979482ce | Georgios Gousios | if not queue in settings.QUEUES: |
253 | 979482ce | Georgios Gousios | print "Queue %s not configured" % queue |
254 | 979482ce | Georgios Gousios | return
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255 | 979482ce | Georgios Gousios | |
256 | 979482ce | Georgios Gousios | print "Queue to be drained: %s" % queue |
257 | 979482ce | Georgios Gousios | |
258 | 979482ce | Georgios Gousios | if not get_user_confirmation(): |
259 | 979482ce | Georgios Gousios | return
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260 | 979482ce | Georgios Gousios | conn = get_connection() |
261 | 979482ce | Georgios Gousios | chan = conn.channel() |
262 | 979482ce | Georgios Gousios | |
263 | e6209aa2 | Georgios Gousios | # Register a temporary queue binding
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264 | e6209aa2 | Georgios Gousios | for binding in settings.BINDINGS: |
265 | e6209aa2 | Georgios Gousios | if binding[0] == queue: |
266 | e6209aa2 | Georgios Gousios | exch = binding[1]
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267 | e6209aa2 | Georgios Gousios | |
268 | e6209aa2 | Georgios Gousios | if not exch: |
269 | e6209aa2 | Georgios Gousios | print "Queue not bound to any exchange: %s" % queue |
270 | e6209aa2 | Georgios Gousios | return
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271 | e6209aa2 | Georgios Gousios | |
272 | e6209aa2 | Georgios Gousios | chan.queue_bind(queue=queue, exchange=exch,routing_key='#')
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273 | e6209aa2 | Georgios Gousios | tag = chan.basic_consume(queue=queue, callback=callbacks.dummy_proc) |
274 | e6209aa2 | Georgios Gousios | |
275 | e6209aa2 | Georgios Gousios | print "Queue draining about to start, hit Ctrl+c when done" |
276 | e6209aa2 | Georgios Gousios | time.sleep(2)
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277 | e6209aa2 | Georgios Gousios | print "Queue draining starting" |
278 | e6209aa2 | Georgios Gousios | |
279 | e6209aa2 | Georgios Gousios | signal(SIGTERM, _exit_handler) |
280 | e6209aa2 | Georgios Gousios | signal(SIGINT, _exit_handler) |
281 | e6209aa2 | Georgios Gousios | |
282 | e6209aa2 | Georgios Gousios | while True: |
283 | e6209aa2 | Georgios Gousios | chan.wait() |
284 | e6209aa2 | Georgios Gousios | chan.basic_cancel(tag) |
285 | 979482ce | Georgios Gousios | chan.connection.close() |
286 | 979482ce | Georgios Gousios | |
287 | 979482ce | Georgios Gousios | def get_connection(): |
288 | 979482ce | Georgios Gousios | conn = amqp.Connection( host=settings.RABBIT_HOST, |
289 | 979482ce | Georgios Gousios | userid=settings.RABBIT_USERNAME, |
290 | 979482ce | Georgios Gousios | password=settings.RABBIT_PASSWORD, |
291 | 979482ce | Georgios Gousios | virtual_host=settings.RABBIT_VHOST) |
292 | 979482ce | Georgios Gousios | return conn
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293 | 979482ce | Georgios Gousios | |
294 | 979482ce | Georgios Gousios | def get_user_confirmation(): |
295 | 979482ce | Georgios Gousios | ans = raw_input("Are you sure (N/y):") |
296 | 979482ce | Georgios Gousios | |
297 | 979482ce | Georgios Gousios | if not ans: |
298 | 979482ce | Georgios Gousios | return False |
299 | 979482ce | Georgios Gousios | if ans not in ['Y', 'y']: |
300 | 979482ce | Georgios Gousios | return False |
301 | 979482ce | Georgios Gousios | return True |
302 | 979482ce | Georgios Gousios | |
303 | 979482ce | Georgios Gousios | |
304 | 57d0082a | Georgios Gousios | def debug_mode(): |
305 | 57d0082a | Georgios Gousios | disp = Dispatcher(debug = True)
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306 | 838239fa | Georgios Gousios | signal(SIGINT, _exit_handler) |
307 | 838239fa | Georgios Gousios | signal(SIGTERM, _exit_handler) |
308 | 838239fa | Georgios Gousios | |
309 | 838239fa | Georgios Gousios | disp.wait() |
310 | 838239fa | Georgios Gousios | |
311 | 838239fa | Georgios Gousios | |
312 | 78e2d194 | Georgios Gousios | def main(): |
313 | 8861126f | Georgios Gousios | global children, logger
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314 | 78e2d194 | Georgios Gousios | (opts, args) = parse_arguments(sys.argv[1:])
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315 | 78e2d194 | Georgios Gousios | |
316 | f13691b3 | Georgios Gousios | logger = log.get_logger("synnefo.dispatcher")
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317 | 8861126f | Georgios Gousios | |
318 | c183005e | Georgios Gousios | # Special case for the clean up queues action
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319 | 979482ce | Georgios Gousios | if opts.purge_queues:
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320 | 979482ce | Georgios Gousios | purge_queues() |
321 | 979482ce | Georgios Gousios | return
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322 | 979482ce | Georgios Gousios | |
323 | 979482ce | Georgios Gousios | # Special case for the clean up exch action
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324 | 979482ce | Georgios Gousios | if opts.purge_exchanges:
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325 | 979482ce | Georgios Gousios | purge_exchanges() |
326 | 979482ce | Georgios Gousios | return
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327 | 979482ce | Georgios Gousios | |
328 | 979482ce | Georgios Gousios | if opts.clean_queue:
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329 | e6209aa2 | Georgios Gousios | drain_queue(opts.queue) |
330 | f30730c0 | Georgios Gousios | return
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331 | f30730c0 | Georgios Gousios | |
332 | 838239fa | Georgios Gousios | # Debug mode, process messages without spawning workers
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333 | 838239fa | Georgios Gousios | if opts.debug:
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334 | 57d0082a | Georgios Gousios | debug_mode() |
335 | 838239fa | Georgios Gousios | return
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336 | 838239fa | Georgios Gousios | |
337 | 57d0082a | Georgios Gousios | # Become a daemon
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338 | 57d0082a | Georgios Gousios | daemon_context = daemon.DaemonContext( |
339 | 4dc0b46a | Georgios Gousios | stdout=sys.stdout, |
340 | 4dc0b46a | Georgios Gousios | stderr=sys.stderr, |
341 | 4dc0b46a | Georgios Gousios | umask=022)
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342 | 4dc0b46a | Georgios Gousios | |
343 | 57d0082a | Georgios Gousios | daemon_context.open() |
344 | de081774 | Georgios Gousios | |
345 | 4ed2e471 | Georgios Gousios | # Create pidfile. Take care of differences between python-daemon versions.
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346 | 4ed2e471 | Georgios Gousios | try:
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347 | 4ed2e471 | Georgios Gousios | pidf = pidfile.TimeoutPIDLockFile(opts.pid_file, 10)
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348 | 4ed2e471 | Georgios Gousios | except:
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349 | 4ed2e471 | Georgios Gousios | pidf = pidlockfile.TimeoutPIDLockFile(opts.pid_file, 10)
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350 | 4ed2e471 | Georgios Gousios | |
351 | de081774 | Georgios Gousios | pidf.acquire() |
352 | de081774 | Georgios Gousios | |
353 | 57d0082a | Georgios Gousios | logger.info("Became a daemon")
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354 | 57d0082a | Georgios Gousios | |
355 | c183005e | Georgios Gousios | # Fork workers
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356 | 8861126f | Georgios Gousios | children = [] |
357 | 8861126f | Georgios Gousios | |
358 | 8861126f | Georgios Gousios | i = 0
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359 | 8861126f | Georgios Gousios | while i < opts.workers:
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360 | 8861126f | Georgios Gousios | newpid = os.fork() |
361 | 8861126f | Georgios Gousios | |
362 | 8861126f | Georgios Gousios | if newpid == 0: |
363 | 4dc0b46a | Georgios Gousios | signal(SIGINT, _exit_handler) |
364 | c183005e | Georgios Gousios | signal(SIGTERM, _exit_handler) |
365 | 57d0082a | Georgios Gousios | child(sys.argv[1:])
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366 | 4dc0b46a | Georgios Gousios | sys.exit(1)
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367 | 8861126f | Georgios Gousios | else:
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368 | 8861126f | Georgios Gousios | pids = (os.getpid(), newpid) |
369 | 8861126f | Georgios Gousios | logger.debug("%d, forked child: %d" % pids)
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370 | 8861126f | Georgios Gousios | children.append(pids[1])
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371 | 8861126f | Georgios Gousios | i += 1
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372 | 8861126f | Georgios Gousios | |
373 | 8d8ea051 | Georgios Gousios | # Catch signals to ensure graceful shutdown
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374 | c183005e | Georgios Gousios | signal(SIGINT, _parent_handler) |
375 | c183005e | Georgios Gousios | signal(SIGTERM, _parent_handler) |
376 | 8861126f | Georgios Gousios | |
377 | 57d0082a | Georgios Gousios | # Wait for all children processes to die, one by one
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378 | de081774 | Georgios Gousios | try :
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379 | de081774 | Georgios Gousios | for pid in children: |
380 | de081774 | Georgios Gousios | try:
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381 | de081774 | Georgios Gousios | os.waitpid(pid, 0)
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382 | de081774 | Georgios Gousios | except Exception: |
383 | de081774 | Georgios Gousios | pass
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384 | de081774 | Georgios Gousios | finally:
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385 | de081774 | Georgios Gousios | pidf.release() |
386 | c183005e | Georgios Gousios | |
387 | d08a5f6f | Vangelis Koukis | if __name__ == "__main__": |
388 | d08a5f6f | Vangelis Koukis | sys.exit(main()) |
389 | d08a5f6f | Vangelis Koukis | |
390 | 8d8ea051 | Georgios Gousios | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |