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# -*- coding: utf-8 -*- |
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# |
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# Copyright (c) 2014-2015 Online SAS and Contributors. All Rights Reserved. |
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# Edouard Bonlieu <[email protected]> |
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# Julien Castets <[email protected]> |
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# Manfred Touron <[email protected]> |
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# Kevin Deldycke <[email protected]> |
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# |
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# Licensed under the BSD 2-Clause License (the "License"); you may not use this |
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# file except in compliance with the License. You may obtain a copy of the |
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# License at http://opensource.org/licenses/BSD-2-Clause |
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""" |
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Thread based concurrency around bulk ops. scaleway api is sync |
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""" |
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import logging |
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try: |
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from Queue import Queue, Empty |
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except ImportError: # Python3 |
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from queue import Queue, Empty |
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import threading |
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logger = logging.getLogger("juju.scaleway") |
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class Runner(object): |
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DEFAULT_NUM_RUNNER = 4 |
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def __init__(self): |
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self.jobs = Queue() |
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self.results = Queue() |
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self.job_count = 0 |
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self.runners = [] |
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self.started = False |
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def queue_op(self, operation): |
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self.jobs.put(operation) |
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self.job_count += 1 |
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def iter_results(self): |
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auto = not self.started |
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if auto: |
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self.start(min(self.DEFAULT_NUM_RUNNER, self.job_count)) |
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for _ in range(self.job_count): |
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self.job_count -= 1 |
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result = self.gather_result() |
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if isinstance(result, Exception): |
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continue |
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yield result |
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if auto: |
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self.stop() |
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def gather_result(self): |
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return self.results.get() |
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def start(self, count): |
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for _ in range(count): |
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runner = OpRunner(self.jobs, self.results) |
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runner.daemon = True |
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self.runners.append(runner) |
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runner.start() |
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self.started = True |
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def stop(self): |
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for runner in self.runners: |
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runner.join() |
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self.started = False |
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class OpRunner(threading.Thread): |
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def __init__(self, ops, results): |
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self.ops = ops |
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self.results = results |
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super(OpRunner, self).__init__() |
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def run(self): |
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while 1: |
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try: |
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operation = self.ops.get(block=False) |
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except Empty: |
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return |
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try: |
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result = operation.run() |
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except Exception as exc: |
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logger.exception("Error while processing op %s", operation) |
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result = exc |
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self.results.put(result) |
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scaleway /
juju-scaleway
