120 lines
3.3 KiB
Python
120 lines
3.3 KiB
Python
# (c) Copyright 2014,2015 Hewlett-Packard Development Company, L.P.
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# (c) Copyright 2016 Hewlett-Packard Enterprise Development Company, L.P.
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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 implied.
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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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"""
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Freezer general utils functions
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"""
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import threading
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from oslo_log import log
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import queue
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LOG = log.getLogger(__name__)
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class Wait(Exception):
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pass
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class RichQueue(object):
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"""
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:type data_queue: Queue.Queue
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"""
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def __init__(self, size=2):
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"""
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:type size: int
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:return:
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"""
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self.data_queue = queue.Queue(maxsize=size)
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# transmission changes in atomic way so no synchronization needed
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self.finish_transmission = False
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self.is_force_stop = False
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def finish(self):
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self.finish_transmission = True
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def force_stop(self):
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self.is_force_stop = True
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def empty(self):
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return self.data_queue.empty()
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def get(self):
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try:
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res = self.data_queue.get(timeout=1)
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self.data_queue.task_done()
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return res
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except queue.Empty:
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raise Wait()
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def check_stop(self):
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if self.is_force_stop:
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raise Exception("Forced stop")
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def put_messages(self, messages):
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for message in messages:
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self.put(message)
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self.finish()
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def has_more(self):
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self.check_stop()
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return not self.finish_transmission or not self.data_queue.empty()
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def put(self, message):
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while True:
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try:
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self.data_queue.put(message, timeout=1)
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break
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except queue.Full:
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self.check_stop()
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def get_messages(self):
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while self.has_more():
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try:
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yield self.get()
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except Wait:
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self.check_stop()
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class QueuedThread(threading.Thread):
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def __init__(self, target, rich_queue, exception_queue,
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args=(), kwargs=None):
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"""
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:type args: collections.Iterable
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:type kwargs: dict
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:type target: () -> ()
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:type rich_queue: RichQueue
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"""
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self.args = args
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kwargs = kwargs or {}
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self.rich_queue = rich_queue
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self._exception_queue = exception_queue
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kwargs["rich_queue"] = rich_queue
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super(QueuedThread, self).__init__(target=target, args=args,
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kwargs=kwargs)
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def run(self):
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try:
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super(QueuedThread, self).run()
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except Exception as e:
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LOG.exception(e)
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self._exception_queue.put_nowait(e)
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self.rich_queue.force_stop()
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# Thread will exit at this point.
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# @todo print the error using traceback.print_exc(file=sys.stdout)
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raise
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