ansible/library/async_wrapper

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#!/usr/bin/python
# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>, and others
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
#
try:
import json
except ImportError:
import simplejson as json
import shlex
import os
import subprocess
import sys
import datetime
import traceback
import signal
import time
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def daemonize_self():
# daemonizing code: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/66012
# logger.info("cobblerd started")
try:
pid = os.fork()
if pid > 0:
# exit first parent
sys.exit(0)
except OSError, e:
print >>sys.stderr, "fork #1 failed: %d (%s)" % (e.errno, e.strerror)
sys.exit(1)
# decouple from parent environment
os.chdir("/")
os.setsid()
os.umask(022)
# do second fork
try:
pid = os.fork()
if pid > 0:
# print "Daemon PID %d" % pid
sys.exit(0)
except OSError, e:
print >>sys.stderr, "fork #2 failed: %d (%s)" % (e.errno, e.strerror)
sys.exit(1)
dev_null = file('/dev/null','rw')
os.dup2(dev_null.fileno(), sys.stdin.fileno())
os.dup2(dev_null.fileno(), sys.stdout.fileno())
os.dup2(dev_null.fileno(), sys.stderr.fileno())
if len(sys.argv) < 3:
print json.dumps({
"failed" : True,
"msg" : "usage: async_wrapper <jid> <time_limit> <modulescript> <argsfile>. Humans, do not call directly!"
})
sys.exit(1)
jid = sys.argv[1]
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time_limit = sys.argv[2]
wrapped_module = sys.argv[3]
argsfile = sys.argv[4]
cmd = "%s %s" % (wrapped_module, argsfile)
# setup logging directory
logdir = os.path.expanduser("~/.ansible_async")
log_path = os.path.join(logdir, jid)
if not os.path.exists(logdir):
try:
os.makedirs(logdir)
except:
print json.dumps({
"failed" : 1,
"msg" : "could not create: %s" % logdir
})
def _run_command(wrapped_cmd, jid, log_path):
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logfile = open(log_path, "w")
logfile.write(json.dumps({ "started" : 1, "ansible_job_id" : jid }))
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logfile.close()
logfile = open(log_path, "w")
result = {}
outdata = ''
try:
cmd = shlex.split(wrapped_cmd)
script = subprocess.Popen(cmd, shell=False,
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stdin=None, stdout=logfile, stderr=logfile)
script.communicate()
outdata = file(log_path).read()
result = json.loads(outdata)
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except (OSError, IOError), e:
result = {
"failed": 1,
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"cmd" : wrapped_cmd,
"msg": str(e),
}
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result['ansible_job_id'] = jid
logfile.write(json.dumps(result))
except:
result = {
"failed" : 1,
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"cmd" : wrapped_cmd,
"data" : outdata, # temporary debug only
"msg" : traceback.format_exc()
}
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result['ansible_job_id'] = jid
logfile.write(json.dumps(result))
logfile.close()
# immediately exit this process, leaving an orphaned process
# running which immediately forks a supervisory timing process
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pid = os.fork()
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if pid != 0:
# the parent indicates the job has started
# print "RETURNING SUCCESS IN PARENT"
print json.dumps({ "started" : 1, "ansible_job_id" : jid, "results_file" : log_path })
sys.stdout.flush()
# we need to not return immmediately such that the launched command has an attempt
# to initialize PRIOR to ansible trying to clean up the launch directory (and argsfile)
# this probably could be done with some IPC later. Modules should always read
# the argsfile at the very first start of their execution anyway
time.sleep(1)
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sys.exit(0)
else:
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# the kid manages the job
# WARNING: the following call may be total overkill
daemonize_self()
# we are now daemonized in this other fork but still
# want to create a supervisory process
#print "DAEMONIZED KID MAKING MORE KIDS"
sub_pid = os.fork()
if sub_pid == 0:
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#print "RUNNING IN KID A"
_run_command(cmd, jid, log_path)
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#print "KID A COMPLETE"
sys.stdout.flush()
sys.exit(0)
else:
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#print "WATCHING IN KID B"
remaining = int(time_limit)
if os.path.exists("/proc/%s" % sub_pid):
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#print "STILL RUNNING"
time.sleep(1)
remaining = remaining - 1
else:
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#print "DONE IN KID B"
sys.stdout.flush()
sys.exit(0)
if remaining == 0:
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#print "SLAYING IN KID B"
os.kill(sub_pid, signals.SIGKILL)
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sys.stdout.flush()
sys.exit(1)
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sys.stdout.flush()
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sys.exit(0)