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# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
import logging
import os
import time
import Queue
from datetime import datetime, timedelta
import signal
import sys
import faulthandler
import pylons
from paste.deploy import loadapp
from paste.deploy.converters import asint
from webob import Request
import base
faulthandler.enable()
status_log = logging.getLogger('taskdstatus')
class TaskdCommand(base.Command):
summary = 'Task server'
parser = base.Command.standard_parser(verbose=True)
parser.add_option('--only', dest='only', type='string', default=None,
help='only handle tasks of the given name(s) (can be comma-separated list)')
def command(self):
self.basic_setup()
self.keep_running = True
self.restart_when_done = False
base.log.info('Starting taskd, pid %s' % os.getpid())
signal.signal(signal.SIGHUP, self.graceful_restart)
signal.signal(signal.SIGTERM, self.graceful_stop)
signal.signal(signal.SIGUSR1, self.log_current_task)
# restore default behavior of not interrupting system calls
# see http://docs.python.org/library/signal.html#signal.siginterrupt
# and http://linux.die.net/man/3/siginterrupt
signal.siginterrupt(signal.SIGHUP, False)
signal.siginterrupt(signal.SIGTERM, False)
signal.siginterrupt(signal.SIGUSR1, False)
self.worker()
def graceful_restart(self, signum, frame):
base.log.info('taskd pid %s recieved signal %s preparing to do a graceful restart' % (os.getpid(), signum))
self.keep_running = False
self.restart_when_done = True
def graceful_stop(self, signum, frame):
base.log.info('taskd pid %s recieved signal %s preparing to do a graceful stop' % (os.getpid(), signum))
self.keep_running = False
def log_current_task(self, signum, frame):
entry = 'taskd pid %s is currently handling task %s' % (os.getpid(), getattr(self, 'task', None))
status_log.info(entry)
base.log.info(entry)
def worker(self):
from allura import model as M
name = '%s pid %s' % (os.uname()[1], os.getpid())
wsgi_app = loadapp('config:%s#task' % self.args[0],relative_to=os.getcwd())
poll_interval = asint(pylons.config.get('monq.poll_interval', 10))
only = self.options.only
if only:
only = only.split(',')
# errors get logged via regular logging and also recorded into the mongo task record
# so this is generally not needed, and only present to avoid errors within
# weberror's ErrorMiddleware if the default error stream (stderr?) doesn't work
wsgi_error_log = open(pylons.config.get('taskd.wsgi_log', '/dev/null'), 'a')
def start_response(status, headers, exc_info=None):
pass
def waitfunc_amqp():
try:
return pylons.app_globals.amq_conn.queue.get(timeout=poll_interval)
except Queue.Empty:
return None
def waitfunc_noq():
time.sleep(poll_interval)
def check_running(func):
def waitfunc_checks_running():
if self.keep_running:
return func()
else:
raise StopIteration
return waitfunc_checks_running
if pylons.app_globals.amq_conn:
waitfunc = waitfunc_amqp
else:
waitfunc = waitfunc_noq
waitfunc = check_running(waitfunc)
while self.keep_running:
if pylons.app_globals.amq_conn:
pylons.app_globals.amq_conn.reset()
try:
while self.keep_running:
self.task = M.MonQTask.get(
process=name,
waitfunc=waitfunc,
only=only)
if self.task:
# Build the (fake) request
r = Request.blank('/--%s--/' % self.task.task_name,
{'task': self.task,
'wsgi.errors': wsgi_error_log, # ErrorMiddleware records error details here
})
list(wsgi_app(r.environ, start_response))
self.task = None
except Exception as e:
if self.keep_running:
base.log.exception('taskd error %s; pausing for 10s before taking more tasks' % e)
time.sleep(10)
else:
base.log.exception('taskd error %s' % e)
finally:
wsgi_error_log.flush()
base.log.info('taskd pid %s stopping gracefully.' % os.getpid())
if self.restart_when_done:
base.log.info('taskd pid %s restarting itself' % os.getpid())
os.execv(sys.argv[0], sys.argv)
class TaskCommand(base.Command):
summary = 'Task command'
parser = base.Command.standard_parser(verbose=True)
parser.add_option('-s', '--state', dest='state', default='ready',
help='state of processes to examine')
parser.add_option('-t', '--timeout', dest='timeout', type=int, default=60,
help='timeout (in seconds) for busy tasks')
min_args = 2
max_args = None
usage = '<ini file> [list|retry|purge|timeout|commit]'
def command(self):
self.basic_setup()
cmd = self.args[1]
tab = dict(
list=self._list,
retry=self._retry,
purge=self._purge,
timeout=self._timeout,
commit=self._commit)
tab[cmd]()
def _list(self):
'''List tasks'''
from allura import model as M
base.log.info('Listing tasks of state %s', self.options.state)
if self.options.state == '*':
q = dict()
else:
q = dict(state=self.options.state)
for t in M.MonQTask.query.find(q):
print t
def _retry(self):
'''Retry tasks in an error state'''
from allura import model as M
base.log.info('Retry tasks in error state')
M.MonQTask.query.update(
dict(state='error'),
{'$set': dict(state='ready')},
multi=True)
def _purge(self):
'''Purge completed tasks'''
from allura import model as M
base.log.info('Purge complete/forget tasks')
M.MonQTask.query.remove(
dict(state='complete', result_type='forget'))
def _timeout(self):
'''Reset tasks that have been busy too long to 'ready' state'''
from allura import model as M
base.log.info('Reset tasks stuck for %ss or more', self.options.timeout)
cutoff = datetime.utcnow() - timedelta(seconds=self.options.timeout)
M.MonQTask.timeout_tasks(cutoff)
def _commit(self):
'''Schedule a SOLR commit'''
from allura.tasks import index_tasks
base.log.info('Commit to solr')
index_tasks.commit.post()