b889a7e5d4
removed unnecesary header in license added missing header in files Change-Id: Iea79505307479541de01231dd25c3821e9e8997c
172 lines
4.9 KiB
Python
172 lines
4.9 KiB
Python
"""
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(c) Copyright 2014,2015 Hewlett-Packard 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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http://www.apache.org/licenses/LICENSE-2.0
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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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Freezer general utils functions
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"""
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import threading
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import logging
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import Queue
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class Wait(Exception):
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pass
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class StorageManager:
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def __init__(self, input_queue, output_queues):
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"""
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:type input_queue: streaming.RichQueue
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:param input_queue:
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:type output_queues: collections.Iterable[streaming.RichQueue]
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:param output_queues:
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:return:
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"""
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self.input_queue = input_queue
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self.output_queues = output_queues
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self.broken_output_queues = set()
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def send_message(self, message, finish=False):
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for output_queue in self.output_queues:
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if output_queue not in self.broken_output_queues:
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try:
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if finish:
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output_queue.finish()
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else:
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output_queue.put(message)
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except Exception as e:
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logging.exception(e)
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StorageManager.one_fails_all_fail(
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self.input_queue, self.output_queues)
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self.broken_output_queues.add(output_queue)
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def transmit(self):
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for message in self.input_queue.get_messages():
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self.send_message(message)
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self.send_message("", True)
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@staticmethod
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def one_fails_all_fail(input_queue, output_queues):
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input_queue.force_stop()
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for output_queue in output_queues:
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output_queue.force_stop()
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raise Exception("All fail")
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class RichQueue:
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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, 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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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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self.rich_queue.force_stop()
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raise e
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def stream(read_function, read_function_kwargs,
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write_function, write_function_kwargs, queue_size=10):
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"""
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:param queue_size:
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:type queue_size: int
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:return:
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"""
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input_queue = RichQueue(queue_size)
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read_stream = QueuedThread(read_function, input_queue,
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kwargs=read_function_kwargs)
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output_queue = RichQueue(queue_size)
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write_stream = QueuedThread(write_function, output_queue,
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kwargs=write_function_kwargs)
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read_stream.daemon = True
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write_stream.daemon = True
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read_stream.start()
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write_stream.start()
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manager = StorageManager(input_queue, [output_queue])
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manager.transmit()
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read_stream.join()
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write_stream.join()
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