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"""This module contains AWS Glue Catalog Hook"""
from __future__ import annotations
from botocore.exceptions import ClientError
from airflow.exceptions import AirflowException
from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
[docs]class GlueCatalogHook(AwsBaseHook):
"""
Interact with AWS Glue Catalog
Additional arguments (such as ``aws_conn_id``) may be specified and
are passed down to the underlying AwsBaseHook.
.. seealso::
:class:`~airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook`
"""
def __init__(self, *args, **kwargs):
super().__init__(client_type="glue", *args, **kwargs)
[docs] def get_partitions(
self,
database_name: str,
table_name: str,
expression: str = "",
page_size: int | None = None,
max_items: int | None = None,
) -> set[tuple]:
"""
Retrieves the partition values for a table.
:param database_name: The name of the catalog database where the partitions reside.
:param table_name: The name of the partitions' table.
:param expression: An expression filtering the partitions to be returned.
Please see official AWS documentation for further information.
https://docs.aws.amazon.com/glue/latest/dg/aws-glue-api-catalog-partitions.html#aws-glue-api-catalog-partitions-GetPartitions
:param page_size: pagination size
:param max_items: maximum items to return
:return: set of partition values where each value is a tuple since
a partition may be composed of multiple columns. For example:
``{('2018-01-01','1'), ('2018-01-01','2')}``
"""
config = {
"PageSize": page_size,
"MaxItems": max_items,
}
paginator = self.get_conn().get_paginator("get_partitions")
response = paginator.paginate(
DatabaseName=database_name, TableName=table_name, Expression=expression, PaginationConfig=config
)
partitions = set()
for page in response:
for partition in page["Partitions"]:
partitions.add(tuple(partition["Values"]))
return partitions
[docs] def check_for_partition(self, database_name: str, table_name: str, expression: str) -> bool:
"""
Checks whether a partition exists
:param database_name: Name of hive database (schema) @table belongs to
:param table_name: Name of hive table @partition belongs to
:expression: Expression that matches the partitions to check for
(eg `a = 'b' AND c = 'd'`)
>>> hook = GlueCatalogHook()
>>> t = 'static_babynames_partitioned'
>>> hook.check_for_partition('airflow', t, "ds='2015-01-01'")
True
"""
partitions = self.get_partitions(database_name, table_name, expression, max_items=1)
return bool(partitions)
[docs] def get_table(self, database_name: str, table_name: str) -> dict:
"""
Get the information of the table
:param database_name: Name of hive database (schema) @table belongs to
:param table_name: Name of hive table
>>> hook = GlueCatalogHook()
>>> r = hook.get_table('db', 'table_foo')
>>> r['Name'] = 'table_foo'
"""
result = self.get_conn().get_table(DatabaseName=database_name, Name=table_name)
return result["Table"]
[docs] def get_table_location(self, database_name: str, table_name: str) -> str:
"""
Get the physical location of the table
:param database_name: Name of hive database (schema) @table belongs to
:param table_name: Name of hive table
:return: str
"""
table = self.get_table(database_name, table_name)
return table["StorageDescriptor"]["Location"]
[docs] def get_partition(self, database_name: str, table_name: str, partition_values: list[str]) -> dict:
"""
Gets a Partition
:param database_name: Database name
:param table_name: Database's Table name
:param partition_values: List of utf-8 strings that define the partition
Please see official AWS documentation for further information.
https://docs.aws.amazon.com/glue/latest/dg/aws-glue-api-catalog-partitions.html#aws-glue-api-catalog-partitions-GetPartition
:raises: AirflowException
>>> hook = GlueCatalogHook()
>>> partition = hook.get_partition('db', 'table', ['string'])
>>> partition['Values']
"""
try:
response = self.get_conn().get_partition(
DatabaseName=database_name, TableName=table_name, PartitionValues=partition_values
)
return response["Partition"]
except ClientError as e:
self.log.error("Client error: %s", e)
raise AirflowException("AWS request failed, check logs for more info")
[docs] def create_partition(self, database_name: str, table_name: str, partition_input: dict) -> dict:
"""
Creates a new Partition
:param database_name: Database name
:param table_name: Database's Table name
:param partition_input: Definition of how the partition is created
Please see official AWS documentation for further information.
https://docs.aws.amazon.com/glue/latest/dg/aws-glue-api-catalog-partitions.html#aws-glue-api-catalog-partitions-CreatePartition
:raises: AirflowException
>>> hook = GlueCatalogHook()
>>> partition_input = {"Values": []}
>>> hook.create_partition(database_name="db", table_name="table", partition_input=partition_input)
"""
try:
return self.get_conn().create_partition(
DatabaseName=database_name, TableName=table_name, PartitionInput=partition_input
)
except ClientError as e:
self.log.error("Client error: %s", e)
raise AirflowException("AWS request failed, check logs for more info")
