Source code for sosw.worker

"""
..  hidden-code-block:: text
    :label: View Licence Agreement <br>

    sosw - Serverless Orchestrator of Serverless Workers

    The MIT License (MIT)
    Copyright (C) 2019  sosw core contributors <[email protected]>

    Permission is hereby granted, free of charge, to any person obtaining a copy
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    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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"""

__all__ = ['Worker']
__author__ = "Nikolay Grishchenko"
__version__ = "1.0"

import json
import logging

from sosw.app import Processor
from typing import Dict


logger = logging.getLogger()
logger.setLevel(logging.INFO)


[docs]class Worker(Processor): """ We recommend that you inherit your core Processor from this class in Lambdas that are orchestrated by `sosw`. The ``__call__`` method is supposed to accept the ``event`` of the Lambda invocation. This is a dictionary with the payload received in the lambda_handler during invocation. Worker has all the common methods of :ref:`Processor` and tries to mark task as completed if received ``task_id`` in the ``event``. """ DEFAULT_CONFIG = { 'init_clients': ['lambda'], 'sosw_worker_assistant_lambda': 'sosw_worker_assistant' } # these clients will be initialized by Processor constructor lambda_client = None def __call__(self, event: Dict): """ You can either call super() at the end of your child function or completely overwrite this function. """ # Mark the task as completed in DynamoDB if the event had task_id. try: self.mark_task_as_completed(event.get('task_id')) except Exception: logger.exception(f"Failed to call WorkerAssistant for event {event}") pass super().__call__(event)
[docs] def mark_task_as_completed(self, task_id: str): """ Call worker assistant lambda and tell it to close task """ if not self.lambda_client: self.register_clients(['lambda']) worker_assistant_lambda_name = self.config.get('sosw_worker_assistant_lambda', 'sosw_worker_assistant') payload = { 'action': 'mark_task_as_completed', 'task_id': task_id } payload = json.dumps(payload) lambda_response = self.lambda_client.invoke( FunctionName=worker_assistant_lambda_name, InvocationType='Event', Payload=payload ) logger.debug(f"mark_task_as_completed response: {lambda_response}")