[GitHub] [airflow] marshall7m commented on a change in pull request #13072: AWS Glue Crawler Integration

[GitBox <gi...@apache.org>]

marshall7m commented on a change in pull request #13072:
URL: https://github.com/apache/airflow/pull/13072#discussion_r548649373



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File path: airflow/providers/amazon/aws/hooks/glue_crawler.py
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@@ -0,0 +1,181 @@
+#
+# 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 time
+
+from cached_property import cached_property
+
+from airflow.exceptions import AirflowException
+from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
+
+
+class AwsGlueCrawlerHook(AwsBaseHook):
+    """
+    Interacts with AWS Glue Crawler
+    :param poll_interval: Time (in seconds) to wait between two consecutive calls to check crawler status
+    :type poll_interval: int
+    :param config = Configurations for the AWS Glue crawler
+    :type config = Optional[dict]
+    """
+
+    def __init__(self, poll_interval, *args, **kwargs):
+        self.poll_interval = poll_interval
+        kwargs['client_type'] = 'glue'
+        super().__init__(*args, **kwargs)
+
+    @cached_property
+    def glue_client(self):
+        """:return: AWS Glue client"""
+        return self.get_conn()
+
+    def get_iam_execution_role(self, role_name) -> str:
+        """:return: iam role for crawler execution"""
+        iam_client = self.get_client_type('iam', self.region_name)
+
+        try:
+            glue_execution_role = iam_client.get_role(RoleName=role_name)
+            self.log.info("Iam Role Name: %s", role_name)
+            return glue_execution_role
+        except Exception as general_error:
+            self.log.error("Failed to create aws glue crawler, error: %s", general_error)
+            raise
+
+    def get_or_create_crawler(self, config) -> str:
+        """
+        Creates the crawler if the crawler doesn't exists and returns the crawler name
+
+        :param config = Configurations for the AWS Glue crawler
+        :type config = Optional[dict]
+        :return: Name of the crawler
+        """
+        self.get_iam_execution_role(config["Role"])

Review comment:
       It's more of a check to see if the role exists/valid. I was using the glue job hook (`glue.py`) as a reference in which they used that method. As you said in another suggestion, I think the Glue API should be clear enough to catch when the glue crawler IAM role is invalid. I'll remove this method from the hook.




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