#
# Licensed to the Apache Software Foundation (ASF) under one
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# 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.
"""
This module contains integration with Azure CosmosDB.
AzureCosmosDBHook communicates via the Azure Cosmos library. Make sure that a
Airflow connection of type `azure_cosmos` exists. Authorization can be done by supplying a
login (=Endpoint uri), password (=secret key) and extra fields database_name and collection_name to specify
the default database and collection to use (see connection `azure_cosmos_default` for an example).
"""
from __future__ import annotations
import json
import uuid
from typing import Any
from azure.cosmos.cosmos_client import CosmosClient
from azure.cosmos.exceptions import CosmosHttpResponseError
from airflow.exceptions import AirflowBadRequest
from airflow.hooks.base import BaseHook
from airflow.providers.microsoft.azure.utils import _ensure_prefixes, get_field
[docs]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
:ref:`Azure CosmosDB connection<howto/connection:azure_cosmos>`.
"""
[docs] conn_name_attr = "azure_cosmos_conn_id"
[docs] default_conn_name = "azure_cosmos_default"
[docs] conn_type = "azure_cosmos"
[docs] hook_name = "Azure CosmosDB"
@staticmethod
@staticmethod
@_ensure_prefixes(conn_type="azure_cosmos") # todo: remove when min airflow version >= 2.5
[docs] def get_ui_field_behaviour() -> dict[str, Any]:
"""Returns custom field behaviour."""
return {
"hidden_fields": ["schema", "port", "host", "extra"],
"relabeling": {
"login": "Cosmos Endpoint URI",
"password": "Cosmos Master Key Token",
},
"placeholders": {
"login": "endpoint uri",
"password": "master key",
"database_name": "database name",
"collection_name": "collection name",
},
}
def __init__(self, azure_cosmos_conn_id: str = default_conn_name) -> None:
super().__init__()
self.conn_id = azure_cosmos_conn_id
self._conn: CosmosClient | None = None
self.default_database_name = None
self.default_collection_name = None
def _get_field(self, extras, name):
return get_field(
conn_id=self.conn_id,
conn_type=self.conn_type,
extras=extras,
field_name=name,
)
[docs] def get_conn(self) -> CosmosClient:
"""Return a cosmos db client."""
if not self._conn:
conn = self.get_connection(self.conn_id)
extras = conn.extra_dejson
endpoint_uri = conn.login
master_key = conn.password
self.default_database_name = self._get_field(extras, "database_name")
self.default_collection_name = self._get_field(extras, "collection_name")
# Initialize the Python Azure Cosmos DB client
self._conn = CosmosClient(endpoint_uri, {"masterKey": master_key})
return self._conn
def __get_database_name(self, database_name: str | None = None) -> str:
self.get_conn()
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: str | None = None) -> str:
self.get_conn()
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
[docs] def does_collection_exist(self, collection_name: str, database_name: str) -> bool:
"""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()
.get_database_client(self.__get_database_name(database_name))
.query_containers(
"SELECT * FROM r WHERE r.id=@id",
parameters=[json.dumps({"name": "@id", "value": collection_name})],
)
)
if len(existing_container) == 0:
return False
return True
[docs] def create_collection(
self,
collection_name: str,
database_name: str | None = None,
partition_key: str | None = None,
) -> 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()
.get_database_client(self.__get_database_name(database_name))
.query_containers(
"SELECT * FROM r WHERE r.id=@id",
parameters=[json.dumps({"name": "@id", "value": collection_name})],
)
)
# Only create if we did not find it already existing
if len(existing_container) == 0:
self.get_conn().get_database_client(self.__get_database_name(database_name)).create_container(
collection_name, partition_key=partition_key
)
[docs] def does_database_exist(self, database_name: str) -> bool:
"""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().query_databases(
"SELECT * FROM r WHERE r.id=@id",
parameters=[json.dumps({"name": "@id", "value": database_name})],
)
)
if len(existing_database) == 0:
return False
return True
[docs] def create_database(self, database_name: str) -> None:
"""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().query_databases(
"SELECT * FROM r WHERE r.id=@id",
parameters=[json.dumps({"name": "@id", "value": database_name})],
)
)
# Only create if we did not find it already existing
if len(existing_database) == 0:
self.get_conn().create_database(database_name)
[docs] def delete_database(self, database_name: str) -> None:
"""Deletes an existing database in CosmosDB."""
if database_name is None:
raise AirflowBadRequest("Database name cannot be None.")
self.get_conn().delete_database(database_name)
[docs] def delete_collection(self, collection_name: str, database_name: str | None = None) -> None:
"""Deletes an existing collection in the CosmosDB database."""
if collection_name is None:
raise AirflowBadRequest("Collection name cannot be None.")
self.get_conn().get_database_client(self.__get_database_name(database_name)).delete_container(
collection_name
)
[docs] def upsert_document(self, document, database_name=None, collection_name=None, document_id=None):
"""
Inserts a new document (or updates an existing one) into an existing
collection in the CosmosDB database.
"""
# Assign unique ID if one isn't provided
if document_id is None:
document_id = str(uuid.uuid4())
if document is None:
raise AirflowBadRequest("You cannot insert a None document")
# Add document id if isn't found
if "id" in document:
if document["id"] is None:
document["id"] = document_id
else:
document["id"] = document_id
created_document = (
self.get_conn()
.get_database_client(self.__get_database_name(database_name))
.get_container_client(self.__get_collection_name(collection_name))
.upsert_item(document)
)
return created_document
[docs] def insert_documents(
self, documents, database_name: str | None = None, collection_name: str | None = None
) -> list:
"""Insert a list of new documents into an existing collection in the CosmosDB database."""
if documents is None:
raise AirflowBadRequest("You cannot insert empty documents")
created_documents = []
for single_document in documents:
created_documents.append(
self.get_conn()
.get_database_client(self.__get_database_name(database_name))
.get_container_client(self.__get_collection_name(collection_name))
.create_item(single_document)
)
return created_documents
[docs] def delete_document(
self,
document_id: str,
database_name: str | None = None,
collection_name: str | None = None,
partition_key: str | None = None,
) -> None:
"""Delete an existing document out of a collection in the CosmosDB database."""
if document_id is None:
raise AirflowBadRequest("Cannot delete a document without an id")
(
self.get_conn()
.get_database_client(self.__get_database_name(database_name))
.get_container_client(self.__get_collection_name(collection_name))
.delete_item(document_id, partition_key=partition_key)
)
[docs] def get_document(
self,
document_id: str,
database_name: str | None = None,
collection_name: str | None = None,
partition_key: str | None = None,
):
"""Get a document from an existing collection in the CosmosDB database."""
if document_id is None:
raise AirflowBadRequest("Cannot get a document without an id")
try:
return (
self.get_conn()
.get_database_client(self.__get_database_name(database_name))
.get_container_client(self.__get_collection_name(collection_name))
.read_item(document_id, partition_key=partition_key)
)
except CosmosHttpResponseError:
return None
[docs] def get_documents(
self,
sql_string: str,
database_name: str | None = None,
collection_name: str | None = None,
partition_key: str | None = None,
) -> list | None:
"""Get a list of documents from an existing collection in the CosmosDB database via SQL query."""
if sql_string is None:
raise AirflowBadRequest("SQL query string cannot be None")
try:
result_iterable = (
self.get_conn()
.get_database_client(self.__get_database_name(database_name))
.get_container_client(self.__get_collection_name(collection_name))
.query_items(sql_string, partition_key=partition_key)
)
return list(result_iterable)
except CosmosHttpResponseError:
return None
[docs] def test_connection(self):
"""Test a configured Azure Cosmos connection."""
try:
# Attempt to list existing databases under the configured subscription and retrieve the first in
# the returned iterator. The Azure Cosmos API does allow for creation of a
# CosmosClient with incorrect values but then will fail properly once items are
# retrieved using the client. We need to _actually_ try to retrieve an object to properly test the
# connection.
next(iter(self.get_conn().list_databases()), None)
except Exception as e:
return False, str(e)
return True, "Successfully connected to Azure Cosmos."
[docs]def get_database_link(database_id: str) -> str:
"""Get Azure CosmosDB database link."""
return "dbs/" + database_id
[docs]def get_collection_link(database_id: str, collection_id: str) -> str:
"""Get Azure CosmosDB collection link."""
return get_database_link(database_id) + "/colls/" + collection_id
[docs]def get_document_link(database_id: str, collection_id: str, document_id: str) -> str:
"""Get Azure CosmosDB document link."""
return get_collection_link(database_id, collection_id) + "/docs/" + document_id
