103 lines
3.1 KiB
Python
103 lines
3.1 KiB
Python
#!/usr/bin/env python
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# Copyright (C) 2011-2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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#
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import threading
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import logging
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import queue
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import time
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from nodepool import stats
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class ManagerStoppedException(Exception):
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pass
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class TaskManager(object):
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log = logging.getLogger("nodepool.TaskManager")
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def __init__(self, client, name, rate):
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super(TaskManager, self).__init__()
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self.daemon = True
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self.queue = queue.Queue()
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self._running = True
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self.name = name
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self.rate = float(rate)
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self._client = None
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self.statsd = stats.get_client()
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self._thread = threading.Thread(name=name, target=self.run)
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self._thread.daemon = True
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def setClient(self, client):
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self._client = client
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def start(self):
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self._thread.start()
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def stop(self):
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self._running = False
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self.queue.put(None)
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def join(self):
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self._thread.join()
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def run(self):
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last_ts = 0
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try:
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while True:
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task = self.queue.get()
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if not task:
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if not self._running:
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break
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continue
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while True:
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delta = time.time() - last_ts
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if delta >= self.rate:
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break
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time.sleep(self.rate - delta)
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self.log.debug("Manager %s running task %s (queue: %s)" %
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(self.name, type(task).__name__,
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self.queue.qsize()))
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start = time.time()
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self.runTask(task)
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last_ts = time.time()
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dt = last_ts - start
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self.log.debug("Manager %s ran task %s in %ss" %
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(self.name, type(task).__name__, dt))
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if self.statsd:
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# nodepool.task.PROVIDER.subkey
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subkey = type(task).__name__
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key = 'nodepool.task.%s.%s' % (self.name, subkey)
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self.statsd.timing(key, int(dt * 1000))
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self.statsd.incr(key)
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self.queue.task_done()
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except Exception:
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self.log.exception("Task manager died.")
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raise
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def submitTask(self, task):
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if not self._running:
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raise ManagerStoppedException(
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"Manager %s is no longer running" % self.name)
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self.queue.put(task)
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return task.wait()
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def runTask(self, task):
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task.run(self._client)
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