Source code for airflow.providers.amazon.aws.hooks.glue_catalog
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"""This module contains AWS Glue Catalog Hook"""
from typing import Optional, Set
from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
[docs]class AwsGlueCatalogHook(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: Optional[int] = None,
max_items: Optional[int] = None,
) -> Set[tuple]:
"""
Retrieves the partition values for a table.
:param database_name: The name of the catalog database where the partitions reside.
:type database_name: str
:param table_name: The name of the partitions' table.
:type table_name: str
: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
:type expression: str
:param page_size: pagination size
:type page_size: int
:param max_items: maximum items to return
:type max_items: int
: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
:type database_name: str
:param table_name: Name of hive table @partition belongs to
:type table_name: str
:expression: Expression that matches the partitions to check for
(eg `a = 'b' AND c = 'd'`)
:type expression: str
:rtype: bool
>>> hook = AwsGlueCatalogHook()
>>> 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
:type database_name: str
:param table_name: Name of hive table
:type table_name: str
:rtype: dict
>>> hook = AwsGlueCatalogHook()
>>> 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
:type database_name: str
:param table_name: Name of hive table
:type table_name: str
:return: str
"""
table = self.get_table(database_name, table_name)
return table['StorageDescriptor']['Location']