airflow glue_catalog 源码

airflow glue_catalog 代码

文件路径：/airflow/providers/amazon/aws/hooks/glue_catalog.py

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# to you under the Apache License, Version 2.0 (the
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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


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)

    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

    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'`)
        :rtype: bool

        >>> 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)

    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
        :rtype: dict

        >>> 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']

    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']

    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

        :rtype: dict

        :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")

    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

        :rtype: dict

        :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")

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