root / ganeti / ganeti-eventd.py @ 348f53de
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1 | b024b97a | Georgios Gousios | #!/usr/bin/env python
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2 | b024b97a | Georgios Gousios | #
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3 | b024b97a | Georgios Gousios | # Copyright (c) 2010 Greek Research and Technology Network
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4 | b024b97a | Georgios Gousios | #
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5 | 031d3f3a | Georgios Gousios | """Ganeti notification daemon with amqp
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6 | b024b97a | Georgios Gousios |
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7 | b024b97a | Georgios Gousios | A daemon to monitor the Ganeti job queue and publish job progress
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8 | b024b97a | Georgios Gousios | and Ganeti VM state notifications over a 0mq PUB endpoint.
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9 | b024b97a | Georgios Gousios |
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10 | b024b97a | Georgios Gousios | """
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11 | b024b97a | Georgios Gousios | |
12 | b024b97a | Georgios Gousios | from django.core.management import setup_environ |
13 | b024b97a | Georgios Gousios | |
14 | b024b97a | Georgios Gousios | import sys |
15 | b024b97a | Georgios Gousios | import os |
16 | b024b97a | Georgios Gousios | path = os.path.normpath(os.path.join(os.getcwd(), '..'))
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17 | b024b97a | Georgios Gousios | sys.path.append(path) |
18 | b024b97a | Georgios Gousios | import synnefo.settings as settings |
19 | b024b97a | Georgios Gousios | |
20 | b024b97a | Georgios Gousios | setup_environ(settings) |
21 | b024b97a | Georgios Gousios | |
22 | b024b97a | Georgios Gousios | import time |
23 | b024b97a | Georgios Gousios | import json |
24 | b024b97a | Georgios Gousios | import logging |
25 | b024b97a | Georgios Gousios | import pyinotify |
26 | b024b97a | Georgios Gousios | import daemon |
27 | b024b97a | Georgios Gousios | import daemon.pidlockfile |
28 | 348f53de | Georgios Gousios | import socket |
29 | b024b97a | Georgios Gousios | from signal import signal, SIGINT, SIGTERM |
30 | b024b97a | Georgios Gousios | |
31 | 031d3f3a | Georgios Gousios | from amqplib import client_0_8 as amqp |
32 | b024b97a | Georgios Gousios | |
33 | b024b97a | Georgios Gousios | from threading import Thread, Event, currentThread |
34 | b024b97a | Georgios Gousios | |
35 | b024b97a | Georgios Gousios | from ganeti import utils |
36 | b024b97a | Georgios Gousios | from ganeti import jqueue |
37 | b024b97a | Georgios Gousios | from ganeti import constants |
38 | b024b97a | Georgios Gousios | from ganeti import serializer |
39 | b024b97a | Georgios Gousios | |
40 | b024b97a | Georgios Gousios | class JobFileHandler(pyinotify.ProcessEvent): |
41 | 348f53de | Georgios Gousios | def __init__(self, logger): |
42 | 348f53de | Georgios Gousios | pyinotify.ProcessEvent.__init__(self)
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43 | 348f53de | Georgios Gousios | self.logger = logger
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44 | 348f53de | Georgios Gousios | self.chan = None |
45 | 348f53de | Georgios Gousios | |
46 | 348f53de | Georgios Gousios | def open_channel(self): |
47 | 348f53de | Georgios Gousios | conn = None
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48 | 348f53de | Georgios Gousios | while conn == None: |
49 | 348f53de | Georgios Gousios | handler_logger.info("Attempting to connect to %s", settings.RABBIT_HOST)
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50 | 348f53de | Georgios Gousios | conn = amqp.Connection( host=settings.RABBIT_HOST, |
51 | 348f53de | Georgios Gousios | userid=settings.RABBIT_USERNAME, |
52 | 348f53de | Georgios Gousios | password=settings.RABBIT_PASSWORD, |
53 | 348f53de | Georgios Gousios | virtual_host=settings.RABBIT_VHOST) |
54 | 348f53de | Georgios Gousios | time.sleep(1)
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55 | 348f53de | Georgios Gousios | |
56 | 348f53de | Georgios Gousios | handler_logger.info("Connection succesful, opening channel")
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57 | 348f53de | Georgios Gousios | return conn.channel()
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58 | b024b97a | Georgios Gousios | |
59 | b024b97a | Georgios Gousios | def process_IN_CLOSE_WRITE(self, event): |
60 | 348f53de | Georgios Gousios | if self.chan == None: |
61 | 348f53de | Georgios Gousios | self.chan = self.open_channel() |
62 | 348f53de | Georgios Gousios | |
63 | b024b97a | Georgios Gousios | jobfile = os.path.join(event.path, event.name) |
64 | b024b97a | Georgios Gousios | if not event.name.startswith("job-"): |
65 | b024b97a | Georgios Gousios | self.logger.debug("Not a job file: %s" % event.path) |
66 | b024b97a | Georgios Gousios | return
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67 | b024b97a | Georgios Gousios | |
68 | b024b97a | Georgios Gousios | try:
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69 | b024b97a | Georgios Gousios | data = utils.ReadFile(jobfile) |
70 | b024b97a | Georgios Gousios | except IOError: |
71 | b024b97a | Georgios Gousios | return
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72 | b024b97a | Georgios Gousios | |
73 | b024b97a | Georgios Gousios | data = serializer.LoadJson(data) |
74 | b024b97a | Georgios Gousios | job = jqueue._QueuedJob.Restore(None, data)
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75 | b024b97a | Georgios Gousios | |
76 | b024b97a | Georgios Gousios | for op in job.ops: |
77 | b024b97a | Georgios Gousios | instances = ""
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78 | b024b97a | Georgios Gousios | try:
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79 | b024b97a | Georgios Gousios | instances = " ".join(op.input.instances)
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80 | b024b97a | Georgios Gousios | except AttributeError: |
81 | b024b97a | Georgios Gousios | pass
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82 | b024b97a | Georgios Gousios | |
83 | b024b97a | Georgios Gousios | try:
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84 | b024b97a | Georgios Gousios | instances = op.input.instance_name |
85 | b024b97a | Georgios Gousios | except AttributeError: |
86 | b024b97a | Georgios Gousios | pass
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87 | b024b97a | Georgios Gousios | |
88 | b024b97a | Georgios Gousios | # Get the last line of the op log as message
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89 | b024b97a | Georgios Gousios | try:
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90 | b024b97a | Georgios Gousios | logmsg = op.log[-1][-1] |
91 | b024b97a | Georgios Gousios | except IndexError: |
92 | b024b97a | Georgios Gousios | logmsg = None
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93 | 348f53de | Georgios Gousios | |
94 | b024b97a | Georgios Gousios | self.logger.debug("%d: %s(%s) %s %s", |
95 | 348f53de | Georgios Gousios | int(job.id), op.input.OP_ID, instances, op.status, logmsg)
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96 | b024b97a | Georgios Gousios | |
97 | b024b97a | Georgios Gousios | # Construct message
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98 | b024b97a | Georgios Gousios | msg = { |
99 | 348f53de | Georgios Gousios | "type": "ganeti-op-status", |
100 | 348f53de | Georgios Gousios | "instance": instances,
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101 | 348f53de | Georgios Gousios | "operation": op.input.OP_ID,
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102 | 348f53de | Georgios Gousios | "jobId": int(job.id), |
103 | 348f53de | Georgios Gousios | "status": op.status,
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104 | 348f53de | Georgios Gousios | "logmsg": logmsg
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105 | 348f53de | Georgios Gousios | } |
106 | b024b97a | Georgios Gousios | if logmsg:
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107 | b024b97a | Georgios Gousios | msg["message"] = logmsg
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108 | 348f53de | Georgios Gousios | |
109 | b024b97a | Georgios Gousios | self.logger.debug("PUSHing msg: %s", json.dumps(msg)) |
110 | 031d3f3a | Georgios Gousios | msg = amqp.Message(json.dumps(msg)) |
111 | 031d3f3a | Georgios Gousios | msg.properties["delivery_mode"] = 2 #Persistent |
112 | 348f53de | Georgios Gousios | try:
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113 | 348f53de | Georgios Gousios | self.chan.basic_publish(msg,exchange="ganeti",routing_key="eventd") |
114 | 348f53de | Georgios Gousios | except socket.error:
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115 | 348f53de | Georgios Gousios | self.logger.error("Server went away, reconnecting...") |
116 | 348f53de | Georgios Gousios | self.chan = self.open_channel() |
117 | 348f53de | Georgios Gousios | self.chan.basic_publish(msg,exchange="ganeti",routing_key="eventd") |
118 | 348f53de | Georgios Gousios | except Exception: |
119 | 348f53de | Georgios Gousios | self.logger.error("Uknown error (msg: %s)", msg) |
120 | 348f53de | Georgios Gousios | raise
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121 | b024b97a | Georgios Gousios | |
122 | b024b97a | Georgios Gousios | handler_logger = None
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123 | b024b97a | Georgios Gousios | def fatal_signal_handler(signum, frame): |
124 | b024b97a | Georgios Gousios | global handler_logger
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125 | b024b97a | Georgios Gousios | |
126 | b024b97a | Georgios Gousios | handler_logger.info("Caught fatal signal %d, will raise SystemExit",
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127 | 348f53de | Georgios Gousios | signum) |
128 | b024b97a | Georgios Gousios | raise SystemExit |
129 | b024b97a | Georgios Gousios | |
130 | b024b97a | Georgios Gousios | def parse_arguments(args): |
131 | b024b97a | Georgios Gousios | from optparse import OptionParser |
132 | b024b97a | Georgios Gousios | |
133 | b024b97a | Georgios Gousios | parser = OptionParser() |
134 | b024b97a | Georgios Gousios | parser.add_option("-d", "--debug", action="store_true", dest="debug", |
135 | 348f53de | Georgios Gousios | help="Enable debugging information")
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136 | b024b97a | Georgios Gousios | parser.add_option("-l", "--log", dest="log_file", |
137 | 348f53de | Georgios Gousios | default=settings.GANETI_EVENTD_LOG_FILE, |
138 | 348f53de | Georgios Gousios | metavar="FILE",
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139 | 348f53de | Georgios Gousios | help="Write log to FILE instead of %s" %
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140 | 348f53de | Georgios Gousios | settings.GANETI_EVENTD_LOG_FILE), |
141 | b024b97a | Georgios Gousios | parser.add_option('--pid-file', dest="pid_file", |
142 | 348f53de | Georgios Gousios | default=settings.GANETI_EVENTD_PID_FILE, |
143 | 348f53de | Georgios Gousios | metavar='PIDFILE',
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144 | 348f53de | Georgios Gousios | help="Save PID to file (default: %s)" %
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145 | 348f53de | Georgios Gousios | settings.GANETI_EVENTD_PID_FILE) |
146 | b024b97a | Georgios Gousios | |
147 | b024b97a | Georgios Gousios | return parser.parse_args(args)
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148 | b024b97a | Georgios Gousios | |
149 | b024b97a | Georgios Gousios | def main(): |
150 | b024b97a | Georgios Gousios | global handler_logger
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151 | b024b97a | Georgios Gousios | |
152 | b024b97a | Georgios Gousios | (opts, args) = parse_arguments(sys.argv[1:])
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153 | b024b97a | Georgios Gousios | |
154 | b024b97a | Georgios Gousios | # Create pidfile
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155 | b024b97a | Georgios Gousios | pidf = daemon.pidlockfile.TimeoutPIDLockFile(opts.pid_file, 10)
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156 | b024b97a | Georgios Gousios | |
157 | b024b97a | Georgios Gousios | # Initialize logger
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158 | b024b97a | Georgios Gousios | lvl = logging.DEBUG if opts.debug else logging.INFO |
159 | b024b97a | Georgios Gousios | logger = logging.getLogger("ganeti-amqpd")
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160 | b024b97a | Georgios Gousios | logger.setLevel(lvl) |
161 | b024b97a | Georgios Gousios | formatter = logging.Formatter("%(asctime)s %(module)s[%(process)d] %(levelname)s: %(message)s",
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162 | 348f53de | Georgios Gousios | "%Y-%m-%d %H:%M:%S")
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163 | b024b97a | Georgios Gousios | handler = logging.FileHandler(opts.log_file) |
164 | b024b97a | Georgios Gousios | handler.setFormatter(formatter) |
165 | b024b97a | Georgios Gousios | logger.addHandler(handler) |
166 | b024b97a | Georgios Gousios | handler_logger = logger |
167 | b024b97a | Georgios Gousios | |
168 | 348f53de | Georgios Gousios | # Become a daemon:
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169 | 348f53de | Georgios Gousios | # Redirect stdout and stderr to handler.stream to catch
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170 | 348f53de | Georgios Gousios | # early errors in the daemonization process [e.g., pidfile creation]
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171 | 348f53de | Georgios Gousios | # which will otherwise go to /dev/null.
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172 | 348f53de | Georgios Gousios | daemon_context = daemon.DaemonContext( |
173 | 348f53de | Georgios Gousios | pidfile=pidf, |
174 | 348f53de | Georgios Gousios | umask=022,
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175 | 348f53de | Georgios Gousios | stdout=handler.stream, |
176 | 348f53de | Georgios Gousios | stderr=handler.stream, |
177 | 348f53de | Georgios Gousios | files_preserve=[handler.stream]) |
178 | 348f53de | Georgios Gousios | daemon_context.open() |
179 | 348f53de | Georgios Gousios | logger.info("Became a daemon")
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180 | 348f53de | Georgios Gousios | |
181 | 348f53de | Georgios Gousios | # Catch signals to ensure graceful shutdown
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182 | 348f53de | Georgios Gousios | signal(SIGINT, fatal_signal_handler) |
183 | 348f53de | Georgios Gousios | signal(SIGTERM, fatal_signal_handler) |
184 | 348f53de | Georgios Gousios | |
185 | 348f53de | Georgios Gousios | |
186 | b024b97a | Georgios Gousios | # Monitor the Ganeti job queue, create and push notifications
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187 | b024b97a | Georgios Gousios | wm = pyinotify.WatchManager() |
188 | b024b97a | Georgios Gousios | mask = pyinotify.EventsCodes.ALL_FLAGS["IN_CLOSE_WRITE"]
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189 | 348f53de | Georgios Gousios | handler = JobFileHandler(logger) |
190 | b024b97a | Georgios Gousios | notifier = pyinotify.Notifier(wm, handler) |
191 | b024b97a | Georgios Gousios | |
192 | b024b97a | Georgios Gousios | try:
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193 | b024b97a | Georgios Gousios | # Fail if adding the inotify() watch fails for any reason
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194 | b024b97a | Georgios Gousios | res = wm.add_watch(constants.QUEUE_DIR, mask) |
195 | b024b97a | Georgios Gousios | if res[constants.QUEUE_DIR] < 0: |
196 | b024b97a | Georgios Gousios | raise Exception("pyinotify add_watch returned negative watch descriptor") |
197 | 348f53de | Georgios Gousios | |
198 | b024b97a | Georgios Gousios | logger.info("Now watching %s" % constants.QUEUE_DIR)
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199 | b024b97a | Georgios Gousios | |
200 | b024b97a | Georgios Gousios | while True: # loop forever |
201 | 348f53de | Georgios Gousios | # process the queue of events as explained above
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202 | b024b97a | Georgios Gousios | notifier.process_events() |
203 | b024b97a | Georgios Gousios | if notifier.check_events():
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204 | b024b97a | Georgios Gousios | # read notified events and enqeue them
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205 | b024b97a | Georgios Gousios | notifier.read_events() |
206 | b024b97a | Georgios Gousios | except SystemExit: |
207 | b024b97a | Georgios Gousios | logger.info("SystemExit")
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208 | b024b97a | Georgios Gousios | except:
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209 | b024b97a | Georgios Gousios | logger.exception("Caught exception, terminating")
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210 | b024b97a | Georgios Gousios | finally:
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211 | b024b97a | Georgios Gousios | # destroy the inotify's instance on this interrupt (stop monitoring)
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212 | b024b97a | Georgios Gousios | notifier.stop() |
213 | b024b97a | Georgios Gousios | raise
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214 | b024b97a | Georgios Gousios | |
215 | b024b97a | Georgios Gousios | if __name__ == "__main__": |
216 | b024b97a | Georgios Gousios | sys.exit(main()) |
217 | b024b97a | Georgios Gousios | |
218 | 348f53de | Georgios Gousios | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |