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# Copyright (C) 2018 Codethink Limited
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Author:
# Tristan Daniël Maat <tristan.maat@codethink.co.uk>
#
from .job import Job, ChildJob
# ElementJob()
#
# A job to run an element's commands. When this job is started
# `action_cb` will be called, and when it completes `complete_cb` will
# be called.
#
# Args:
# scheduler (Scheduler): The scheduler
# action_name (str): The queue action name
# max_retries (int): The maximum number of retries
# action_cb (callable): The function to execute on the child
# complete_cb (callable): The function to execute when the job completes
# element (Element): The element to work on
# kwargs: Remaining Job() constructor arguments
#
# Here is the calling signature of the action_cb:
#
# action_cb():
#
# This function will be called in the child task
#
# Args:
# element (Element): The element passed to the Job() constructor
#
# Returns:
# (object): Any abstract simple python object, including a string, int,
# bool, list or dict, this must be a simple serializable object.
#
# Here is the calling signature of the complete_cb:
#
# complete_cb():
#
# This function will be called when the child task completes
#
# Args:
# job (Job): The job object which completed
# element (Element): The element passed to the Job() constructor
# status (JobStatus): The status of whether the workload raised an exception
# result (object): The deserialized object returned by the `action_cb`, or None
# if `success` is False
#
class ElementJob(Job):
def __init__(self, *args, element, queue, action_cb, complete_cb, **kwargs):
super().__init__(*args, **kwargs)
self.set_name(element._get_full_name())
self.queue = queue
self._element = element # Set the Element pertaining to the job
self._action_cb = action_cb # The action callable function
self._complete_cb = complete_cb # The complete callable function
# Set the plugin element name & key for logging purposes
self.set_message_element_name(self.name)
self.set_message_element_key(self._element._get_display_key())
def parent_complete(self, status, result):
self._complete_cb(self, self._element, status, self._result)
def create_child_job(self, *args, **kwargs):
return ChildElementJob(*args, element=self._element, action_cb=self._action_cb, **kwargs)
class ChildElementJob(ChildJob):
def __init__(self, *args, element, action_cb, **kwargs):
super().__init__(*args, **kwargs)
self._element = element
self._action_cb = action_cb
def child_process(self):
# Run the action
return self._action_cb(self._element)
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