[GitHub] [airflow] Tagar commented on a change in pull request #6090: [AIRFLOW-5470] Add Apache Livy REST operator

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Tagar commented on a change in pull request #6090: [AIRFLOW-5470] Add Apache Livy REST operator
URL: https://github.com/apache/airflow/pull/6090#discussion_r330639113
 
 

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 File path: airflow/contrib/hooks/livy_hook.py
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+# -*- coding: utf-8 -*-
+#
+# 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.
+
+"""
+This module contains the Apache Livy hook.
+"""
+
+import re
+from enum import Enum
+import json
+import requests
+
+from airflow.exceptions import AirflowException
+from airflow.hooks.base_hook import BaseHook
+from airflow.utils.log.logging_mixin import LoggingMixin
+
+
+class BatchState(Enum):
+    """
+    Batch session states
+    """
+    NOT_STARTED = 'not_started'
+    STARTING = 'starting'
+    RUNNING = 'running'
+    IDLE = 'idle'
+    BUSY = 'busy'
+    SHUTTING_DOWN = 'shutting_down'
+    ERROR = 'error'
+    DEAD = 'dead'
+    KILLED = 'killed'
+    SUCCESS = 'success'
+
+
+TERMINAL_STATES = {
+    BatchState.SUCCESS,
+    BatchState.DEAD,
+    BatchState.KILLED,
+    BatchState.ERROR,
+}
+
+
+class LivyHook(BaseHook, LoggingMixin):
+    """
+    Hook for Apache Livy through the REST API.
+
+    For more information about the API refer to
+    https://livy.apache.org/docs/latest/rest-api.html
+
+    :param livy_conn_id: reference to a pre-defined Livy Connection.
+    :type livy_conn_id: str
+    """
+    def __init__(self, livy_conn_id='livy_default'):
+        super(LivyHook, self).__init__(livy_conn_id)
+        self._livy_conn_id = livy_conn_id
+        self._build_base_url()
+
+    def _build_base_url(self):
+        """
+        Build connection URL
+        """
+        params = self.get_connection(self._livy_conn_id)
+
+        base_url = params.host
+
+        if not base_url:
+            raise AirflowException("Missing Livy endpoint hostname")
+
+        if '://' not in base_url:
+            base_url = '{}://{}'.format('http', base_url)
 
 Review comment:
   We use http**s**-backed Livy instance. 
   Would be great to make https/http schema configurable 

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