95 lines
3.1 KiB
Python
95 lines
3.1 KiB
Python
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#
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# Copyright (C) 2018 Red Hat, Inc.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions of
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# the GNU General Public License v.2, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY expressed or implied, including the implied warranties of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details. You should have received a copy of the
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# GNU General Public License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
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# source code or documentation are not subject to the GNU General Public
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# License and may only be used or replicated with the express permission of
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# Red Hat, Inc.
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#
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import math
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from time import sleep, perf_counter
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from pyanaconda.modules.common.task.task_interface import TaskInterface
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from pyanaconda.modules.common.task.task import Task, ValidationTask, AbstractTask
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__all__ = ["sync_run_task", "async_run_task", "wait_for_task", "AbstractTask", "Task",
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"ValidationTask", "TaskInterface"]
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def sync_run_task(task_proxy, callback=None):
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"""Run a remote task synchronously.
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The given callback will be called every iteration.
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:param task_proxy: a proxy of the remote task
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:param callback: a callback
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:raise: a remote error
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"""
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task_proxy.Start()
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while task_proxy.IsRunning:
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if callback:
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callback(task_proxy)
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sleep(0.1)
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task_proxy.Finish()
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def async_run_task(task_proxy, callback):
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"""Run a remote task asynchronously.
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The callback is called once the task is done. You should always
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call the Finish method of the remote task in your callback and
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handle the remote errors.
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Example of the callback:
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def callback(task_proxy):
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try:
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task_proxy.Finish()
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except RemoteError as e:
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pass
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:param task_proxy: a proxy of the remote task
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:param callback: a callback with a task_proxy argument
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"""
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def _callback():
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callback(task_proxy)
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task_proxy.Stopped.connect(_callback)
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task_proxy.Start()
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def wait_for_task(task_proxy, timeout=math.inf):
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"""Wait for an existing and running task with optional timeout.
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If the timeout exception is raised, the task is not done. To call its Finish method and
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receive potential errors from its run, you can attach callbacks to the tasks's signals.
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Alternatively, you can give up re-raising the errors entirely.
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:param task_proxy: a proxy of the remote task
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:param float timeout: stop waiting after this time in seconds
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:raise TimeoutError: when the task did not finish before timeout
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"""
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start = perf_counter()
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end = start + timeout
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while task_proxy.IsRunning and perf_counter() <= end:
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sleep(0.1)
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if task_proxy.IsRunning:
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raise TimeoutError()
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task_proxy.Finish()
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