root / ganeti / snf-ganeti-eventd.py @ 737b0e28
History | View | Annotate | Download (8.9 kB)
1 |
#!/usr/bin/env python
|
---|---|
2 |
#
|
3 |
# -*- coding: utf-8 -*-
|
4 |
#
|
5 |
# Copyright 2011 GRNET S.A. All rights reserved.
|
6 |
#
|
7 |
# Redistribution and use in source and binary forms, with or
|
8 |
# without modification, are permitted provided that the following
|
9 |
# conditions are met:
|
10 |
#
|
11 |
# 1. Redistributions of source code must retain the above
|
12 |
# copyright notice, this list of conditions and the following
|
13 |
# disclaimer.
|
14 |
#
|
15 |
# 2. Redistributions in binary form must reproduce the above
|
16 |
# copyright notice, this list of conditions and the following
|
17 |
# disclaimer in the documentation and/or other materials
|
18 |
# provided with the distribution.
|
19 |
#
|
20 |
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
|
21 |
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
22 |
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
23 |
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
|
24 |
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
25 |
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
26 |
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
27 |
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
28 |
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
29 |
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
30 |
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
31 |
# POSSIBILITY OF SUCH DAMAGE.
|
32 |
#
|
33 |
# The views and conclusions contained in the software and
|
34 |
# documentation are those of the authors and should not be
|
35 |
# interpreted as representing official policies, either expressed
|
36 |
# or implied, of GRNET S.A.
|
37 |
#
|
38 |
"""Ganeti notification daemon with AMQP support
|
39 |
|
40 |
A daemon to monitor the Ganeti job queue and publish job progress
|
41 |
and Ganeti VM state notifications to the ganeti exchange
|
42 |
|
43 |
"""
|
44 |
|
45 |
#from django.core.management import setup_environ
|
46 |
|
47 |
import sys |
48 |
import os |
49 |
path = os.path.normpath(os.path.join(os.getcwd(), '..'))
|
50 |
sys.path.append(path) |
51 |
import synnefo.settings as settings |
52 |
|
53 |
#setup_environ(settings)
|
54 |
|
55 |
import time |
56 |
import json |
57 |
import logging |
58 |
import pyinotify |
59 |
import daemon |
60 |
import daemon.pidlockfile |
61 |
import socket |
62 |
from signal import signal, SIGINT, SIGTERM |
63 |
|
64 |
from amqplib import client_0_8 as amqp |
65 |
|
66 |
from ganeti import utils |
67 |
from ganeti import jqueue |
68 |
from ganeti import constants |
69 |
from ganeti import serializer |
70 |
|
71 |
class JobFileHandler(pyinotify.ProcessEvent): |
72 |
def __init__(self, logger): |
73 |
pyinotify.ProcessEvent.__init__(self)
|
74 |
self.logger = logger
|
75 |
self.chan = None |
76 |
|
77 |
def open_channel(self): |
78 |
conn = None
|
79 |
while conn == None: |
80 |
handler_logger.info("Attempting to connect to %s",
|
81 |
settings.RABBIT_HOST) |
82 |
try:
|
83 |
conn = amqp.Connection(host=settings.RABBIT_HOST, |
84 |
userid=settings.RABBIT_USERNAME, |
85 |
password=settings.RABBIT_PASSWORD, |
86 |
virtual_host=settings.RABBIT_VHOST) |
87 |
except socket.error:
|
88 |
time.sleep(1)
|
89 |
|
90 |
handler_logger.info("Connection succesful, opening channel")
|
91 |
return conn.channel()
|
92 |
|
93 |
def process_IN_CLOSE_WRITE(self, event): |
94 |
self.process_IN_MOVED_TO(event)
|
95 |
|
96 |
def process_IN_MOVED_TO(self, event): |
97 |
if self.chan == None: |
98 |
self.chan = self.open_channel() |
99 |
|
100 |
jobfile = os.path.join(event.path, event.name) |
101 |
if not event.name.startswith("job-"): |
102 |
self.logger.debug("Not a job file: %s" % event.path) |
103 |
return
|
104 |
|
105 |
try:
|
106 |
data = utils.ReadFile(jobfile) |
107 |
except IOError: |
108 |
return
|
109 |
|
110 |
data = serializer.LoadJson(data) |
111 |
job = jqueue._QueuedJob.Restore(None, data)
|
112 |
|
113 |
for op in job.ops: |
114 |
instances = ""
|
115 |
try:
|
116 |
instances = " ".join(op.input.instances)
|
117 |
except AttributeError: |
118 |
pass
|
119 |
|
120 |
try:
|
121 |
instances = op.input.instance_name |
122 |
except AttributeError: |
123 |
pass
|
124 |
|
125 |
# Get the last line of the op log as message
|
126 |
try:
|
127 |
logmsg = op.log[-1][-1] |
128 |
except IndexError: |
129 |
logmsg = None
|
130 |
|
131 |
self.logger.debug("Job: %d: %s(%s) %s %s", |
132 |
int(job.id), op.input.OP_ID, instances, op.status, logmsg)
|
133 |
|
134 |
# Construct message
|
135 |
msg = { |
136 |
"type": "ganeti-op-status", |
137 |
"instance": instances,
|
138 |
"operation": op.input.OP_ID,
|
139 |
"jobId": int(job.id), |
140 |
"status": op.status,
|
141 |
"logmsg": logmsg
|
142 |
} |
143 |
if logmsg:
|
144 |
msg["message"] = logmsg
|
145 |
|
146 |
instance = instances.split('-')[0] |
147 |
routekey = "ganeti.%s.event.op" % instance
|
148 |
|
149 |
self.logger.debug("Delivering msg: %s (key=%s)", |
150 |
json.dumps(msg), routekey) |
151 |
msg = amqp.Message(json.dumps(msg)) |
152 |
msg.properties["delivery_mode"] = 2 # Persistent |
153 |
|
154 |
while True: |
155 |
try:
|
156 |
self.chan.basic_publish(msg,
|
157 |
exchange=settings.EXCHANGE_GANETI, |
158 |
routing_key=routekey) |
159 |
return
|
160 |
except socket.error:
|
161 |
self.logger.exception("Server went away, reconnecting...") |
162 |
self.chan = self.open_channel() |
163 |
except Exception: |
164 |
self.logger.exception("Caught unexpected exception, msg: ", |
165 |
msg) |
166 |
raise
|
167 |
|
168 |
handler_logger = None
|
169 |
def fatal_signal_handler(signum, frame): |
170 |
global handler_logger
|
171 |
|
172 |
handler_logger.info("Caught fatal signal %d, will raise SystemExit",
|
173 |
signum) |
174 |
raise SystemExit |
175 |
|
176 |
def parse_arguments(args): |
177 |
from optparse import OptionParser |
178 |
|
179 |
parser = OptionParser() |
180 |
parser.add_option("-d", "--debug", action="store_true", dest="debug", |
181 |
help="Enable debugging information")
|
182 |
parser.add_option("-l", "--log", dest="log_file", |
183 |
default=settings.GANETI_EVENTD_LOG_FILE, |
184 |
metavar="FILE",
|
185 |
help="Write log to FILE instead of %s" %
|
186 |
settings.GANETI_EVENTD_LOG_FILE) |
187 |
parser.add_option('--pid-file', dest="pid_file", |
188 |
default=settings.GANETI_EVENTD_PID_FILE, |
189 |
metavar='PIDFILE',
|
190 |
help="Save PID to file (default: %s)" %
|
191 |
settings.GANETI_EVENTD_PID_FILE) |
192 |
|
193 |
return parser.parse_args(args)
|
194 |
|
195 |
def main(): |
196 |
global handler_logger
|
197 |
|
198 |
(opts, args) = parse_arguments(sys.argv[1:])
|
199 |
|
200 |
# Create pidfile
|
201 |
pidf = daemon.pidlockfile.TimeoutPIDLockFile(opts.pid_file, 10)
|
202 |
|
203 |
# Initialize logger
|
204 |
lvl = logging.DEBUG if opts.debug else logging.INFO |
205 |
logger = logging.getLogger("ganeti.eventd")
|
206 |
logger.setLevel(lvl) |
207 |
formatter = logging.Formatter( |
208 |
"%(asctime)s %(module)s[%(process)d] %(levelname)s: %(message)s",
|
209 |
"%Y-%m-%d %H:%M:%S")
|
210 |
handler = logging.FileHandler(opts.log_file) |
211 |
handler.setFormatter(formatter) |
212 |
logger.addHandler(handler) |
213 |
handler_logger = logger |
214 |
|
215 |
# Become a daemon:
|
216 |
# Redirect stdout and stderr to handler.stream to catch
|
217 |
# early errors in the daemonization process [e.g., pidfile creation]
|
218 |
# which will otherwise go to /dev/null.
|
219 |
daemon_context = daemon.DaemonContext( |
220 |
pidfile=pidf, |
221 |
umask=022,
|
222 |
stdout=handler.stream, |
223 |
stderr=handler.stream, |
224 |
files_preserve=[handler.stream]) |
225 |
daemon_context.open() |
226 |
logger.info("Became a daemon")
|
227 |
|
228 |
# Catch signals to ensure graceful shutdown
|
229 |
signal(SIGINT, fatal_signal_handler) |
230 |
signal(SIGTERM, fatal_signal_handler) |
231 |
|
232 |
# Monitor the Ganeti job queue, create and push notifications
|
233 |
wm = pyinotify.WatchManager() |
234 |
mask = pyinotify.EventsCodes.ALL_FLAGS["IN_MOVED_TO"] | \
|
235 |
pyinotify.EventsCodes.ALL_FLAGS["IN_CLOSE_WRITE"]
|
236 |
handler = JobFileHandler(logger) |
237 |
notifier = pyinotify.Notifier(wm, handler) |
238 |
|
239 |
try:
|
240 |
# Fail if adding the inotify() watch fails for any reason
|
241 |
res = wm.add_watch(constants.QUEUE_DIR, mask) |
242 |
if res[constants.QUEUE_DIR] < 0: |
243 |
raise Exception("pyinotify add_watch returned negative descriptor") |
244 |
|
245 |
logger.info("Now watching %s" % constants.QUEUE_DIR)
|
246 |
|
247 |
while True: # loop forever |
248 |
# process the queue of events as explained above
|
249 |
notifier.process_events() |
250 |
if notifier.check_events():
|
251 |
# read notified events and enqeue them
|
252 |
notifier.read_events() |
253 |
except SystemExit: |
254 |
logger.info("SystemExit")
|
255 |
except:
|
256 |
logger.exception("Caught exception, terminating")
|
257 |
finally:
|
258 |
# destroy the inotify's instance on this interrupt (stop monitoring)
|
259 |
notifier.stop() |
260 |
raise
|
261 |
|
262 |
if __name__ == "__main__": |
263 |
sys.exit(main()) |
264 |
|
265 |
# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :
|