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import os
import datetime
import time
import signal
try:
import multiprocessing
except:
import sys
sys.exit("multiprocessing was not available")
from pyres import ResQ
from pyres.exceptions import NoQueueError
from pyres.worker import Worker
class JuniorWorker(Worker):
def work(self, interval=5):
self.startup()
while True:
if self._shutdown:
break
job = self.reserve()
if job:
print "got: %s" % job
self.child = os.fork()
if self.child:
print 'Forked %s at %s' % (self.child,
datetime.datetime.now())
os.waitpid(self.child, 0)
else:
print 'Processing %s since %s' % (job._queue,
datetime.datetime.now())
self.process(job)
os._exit(0)
self.child = None
else:
break
self.unregister_worker()
class Manager(object):
def __init__(self, queues, host, max_children=10):
self.queues = queues
self._host = host
self.max_children = max_children
self._shutdown = False
self.children = []
self.resq = ResQ(host)
self.validate_queues()
self.reports = {}
def __str__(self):
hostname = os.uname()[1]
pid = os.getpid()
return 'Manager:%s:%s:%s' % (hostname, pid, ','.join(self.queues))
def validate_queues(self):
if not self.queues:
raise NoQueueError("Please give each worker at least one queue.")
def check_rising(self, queue, size):
if queue in self.reports:
new_time = time.time()
old_size = self.reports[queue][0]
old_time = self.reports[queue][1]
if new_time > old_time + 5 and size > old_size + 20:
return True
else:
self.reports[queue] = (size, time.time())
return False
def work(self):
self.startup()
while True:
if self._shutdown:
break
#check to see if stuff is still going
for queue in self.queues:
#check queue size
size = self.resq.size(queue)
if self.check_rising(queue, size):
if len(self.children) < self.max_children:
self.start_child(queue)
def startup(self):
self.register_manager()
self.register_signals()
def register_manager(self):
self.resq.redis.sadd('managers', str(self))
def unregister_manager(self):
self.resq.redis.srem('managers', str(self))
def register_signals(self):
signal.signal(signal.SIGTERM, self.shutdown_all)
signal.signal(signal.SIGINT, self.shutdown_all)
signal.signal(signal.SIGQUIT, self.schedule_shutdown)
signal.signal(signal.SIGUSR1, self.kill_children)
def shutdown_all(self, signum, frame):
self.schedule_shutdown(signum, frame)
self.kill_children(signum, frame)
def schedule_shutdown(self, signum, frame):
self._shutdown = True
def kill_children(self):
for child in self.children:
child.terminate()
def start_child(self, queue):
p = multiprocessing.Process(target=JuniorWorker.run, args=([queue],
self._host))
self.children.append(p)
p.start()
return True
@classmethod
def run(cls, queues=(), host="localhost:6379"):
manager = cls(queues, host)
manager.work()
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