tmiller-msft commented on a change in pull request #4265: [AIRFLOW-3406] Implement an Azure CosmosDB operator URL: https://github.com/apache/incubator-airflow/pull/4265#discussion_r239224262
########## File path: airflow/contrib/hooks/azure_cosmos_hook.py ########## @@ -0,0 +1,287 @@ +# -*- coding: utf-8 -*- +# +# 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 azure.cosmos.cosmos_client as cosmos_client +from azure.cosmos.errors import HTTPFailure +import uuid + +from airflow.exceptions import AirflowBadRequest +from airflow.hooks.base_hook import BaseHook + + +class AzureCosmosDBHook(BaseHook): + """ + Interacts with Azure CosmosDB. + + login should be the endpoint uri, password should be the master key + optionally, you can use the following extras to default these values + {"database_name": "<DATABASE_NAME>", "collection_name": "COLLECTION_NAME"}. + + :param azure_cosmos_conn_id: Reference to the Azure CosmosDB connection. + :type azure_cosmos_conn_id: str + """ + + def __init__(self, azure_cosmos_conn_id='azure_cosmos_default'): + self.conn_id = azure_cosmos_conn_id + self.connection = self.get_connection(self.conn_id) + self.extras = self.connection.extra_dejson + + self.endpoint_uri = self.connection.login + self.master_key = self.connection.password + self.default_database_name = self.extras.get('database_name') + self.default_collection_name = self.extras.get('collection_name') + self.cosmos_client = None + + def get_conn(self): + """ + Return a cosmos db client. + """ + if self.cosmos_client is not None: + return self.cosmos_client + + # Initialize the Python Azure Cosmos DB client + self.cosmos_client = cosmos_client.CosmosClient(self.endpoint_uri, {'masterKey': self.master_key}) + + return self.cosmos_client + + def get_database_name(self, database_name=None): + db_name = database_name + if db_name is None: + db_name = self.default_database_name + + if db_name is None: + raise AirflowBadRequest("Database name must be specified") + + return db_name + + def get_collection_name(self, collection_name=None): + coll_name = collection_name + if coll_name is None: + coll_name = self.default_collection_name + + if coll_name is None: + raise AirflowBadRequest("Collection name must be specified") + + return coll_name + + def does_collection_exist(self, collection_name, database_name=None): + """ + Checks if a collection exists in CosmosDB. + """ + if collection_name is None: + raise AirflowBadRequest("Collection name cannot be None.") + + existing_container = list(self.get_conn().QueryContainers( + GetDatabaseLink(self.get_database_name(database_name)), { + "query": "SELECT * FROM r WHERE r.id=@id", + "parameters": [ + {"name": "@id", "value": collection_name} + ] + })) + if len(existing_container) == 0: + return False + + return True + + def create_collection(self, collection_name, database_name=None): + """ + Creates a new collection in the CosmosDB database. + """ + if collection_name is None: + raise AirflowBadRequest("Collection name cannot be None.") + + # We need to check to see if this container already exists so we don't try + # to create it twice + existing_container = list(self.get_conn().QueryContainers( + GetDatabaseLink(self.get_database_name(database_name)), { + "query": "SELECT * FROM r WHERE r.id=@id", + "parameters": [ + {"name": "@id", "value": collection_name} + ] + })) + + # Only create if we did not find it already existing + if len(existing_container) == 0: + self.get_conn().CreateContainer( + GetDatabaseLink(self.get_database_name(database_name)), + {"id": collection_name}) + + def does_database_exist(self, database_name): + """ + Checks if a database exists in CosmosDB. + """ + if database_name is None: + raise AirflowBadRequest("Database name cannot be None.") + + existing_database = list(self.get_conn().QueryDatabases({ + "query": "SELECT * FROM r WHERE r.id=@id", + "parameters": [ + {"name": "@id", "value": database_name} + ] + })) + if len(existing_database) == 0: + return False + + return True + + def create_database(self, database_name): + """ + Creates a new database in CosmosDB. + """ + if database_name is None: + raise AirflowBadRequest("Database name cannot be None.") + + # We need to check to see if this database already exists so we don't try + # to create it twice + existing_database = list(self.get_conn().QueryDatabases({ + "query": "SELECT * FROM r WHERE r.id=@id", Review comment: Yes, this is the syntax for queries for cosmos ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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