ashb commented on a change in pull request #8701: URL: https://github.com/apache/airflow/pull/8701#discussion_r426575179
########## File path: airflow/providers/amazon/aws/hooks/elasticache.py ########## @@ -0,0 +1,259 @@ +# +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +import re +from time import sleep + +from airflow.exceptions import AirflowException +from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook + + +class ElastiCacheHook(AwsBaseHook): + """ + Interact with AWS ElastiCache + """ + + # Constants for ElastiCache describe API response keys + REPLICATION_GROUPS = 'ReplicationGroups' + REPLICATION_GROUP = 'ReplicationGroup' + STATUS = 'Status' + + # Constants for ElastiCache delete API response messages + RESPONSE_NOT_VALID_STATE = 'not in a valid state to be deleted' + RESPONSE_DELETING_STATE = 'has status deleting which is not valid for deletion' + RESPONSE_MODIFYING_STATE = 'has status modifying which is not valid for deletion' + + # Constants for ElastiCache replication group status + STATUS_CREATING = 'creating' + STATUS_AVAILABLE = 'available' + STATUS_DELETING = 'deleting' + STATUS_CREATE_FAILED = 'create-failed' + + def __init__( + self, max_retries=10, exponential_back_off_factor=1, initial_poke_interval=60, *args, **kwargs + ): + """ + :param max_retries: Max tries for checking availability of and deleting replication group + :param exponential_back_off_factor: Factor for deciding next sleep time + :param initial_poke_interval: Initial sleep time in seconds + """ + self.max_retries = max_retries + self.exponential_back_off_factor = exponential_back_off_factor + self.initial_poke_interval = initial_poke_interval + + super().__init__(client_type='elasticache', *args, **kwargs) + + def create_replication_group(self, config): + """ + Call ElastiCache API for creating a replication group + :param config: Python dictionary to use as config for creating replication group + :return: Response from ElastiCache create replication group API + """ + return self.conn.create_replication_group(**config) + + def delete_replication_group(self, replication_group_id): + """ + Call ElastiCache API for deleting a replication group + :param replication_group_id: ID of replication group to delete + :return: Response from ElastiCache delete replication group API + """ + return self.conn.delete_replication_group(ReplicationGroupId=replication_group_id) + + def describe_replication_group(self, replication_group_id): + """ + Call ElastiCache API for describing a replication group + :param replication_group_id: ID of replication group to describe + :return: Response from ElastiCache describe replication group API + """ + return self.conn.describe_replication_groups(ReplicationGroupId=replication_group_id) + + def get_replication_group_status(self, replication_group_id): + """ + Get current status of replication group + :param replication_group_id: ID of replication group to check for status + :return: Current status of replication group + """ + return self.describe_replication_group(replication_group_id)[self.REPLICATION_GROUPS][0][self.STATUS] + + def is_replication_group_available(self, replication_group_id): + """ + Helper for checking if replication is available or not + :param replication_group_id: ID of replication group to check for availability + :return: True if available else False + replication group + """ + return self.get_replication_group_status( + replication_group_id=replication_group_id + ) == self.STATUS_AVAILABLE + + def should_stop_poking(self, replication_group_id): + """ + Helper for checking if we should stop poking replication group for availability or not + :param replication_group_id: ID of replication group to check + :return: Flag to check if availability check should be stopped or not and current status of + replication group + """ + status = self.get_replication_group_status(replication_group_id=replication_group_id) + + return status in ( + self.STATUS_AVAILABLE, + self.STATUS_CREATE_FAILED, + self.STATUS_DELETING + ), status + + def wait_for_availability( + self, + replication_group_id, + initial_sleep_time=None, + exponential_back_off_factor=None, + max_retries=None + ): + """ + Check if replication is available or not by performing a describe over it + :param max_retries: Max tries for checking availability of replication group + :param exponential_back_off_factor: Factor for deciding next sleep time + :param initial_sleep_time: Initial sleep time in seconds + :param replication_group_id: ID of replication group to check for availability + :return: True if replication is available else False + """ + sleep_time = initial_sleep_time or self.initial_poke_interval Review comment: This doesn't let you put any of these values as `0` -- it would then fallback to the `self.initial_poke_interval` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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