[GitHub] [airflow] ashb commented on a change in pull request #4887: [AIRFLOW-4055] Add AWS SQS Sensor

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ashb commented on a change in pull request #4887: [AIRFLOW-4055] Add AWS SQS Sensor
URL: https://github.com/apache/airflow/pull/4887#discussion_r272376840
 
 

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 File path: airflow/contrib/sensors/aws_sqs_sensor.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.
+
+from airflow.sensors.base_sensor_operator import BaseSensorOperator
+from airflow.utils.decorators import apply_defaults
+from airflow.contrib.hooks.aws_sqs_hook import SQSHook
+from airflow.exceptions import AirflowException
+
+
+class SQSSensor(BaseSensorOperator):
+    """
+    Get messages from an SQS queue and passes them through XCom.
+
+    :param aws_conn_id: AWS connection id
+    :type aws_conn_id: str
+    :param sqs_queue: The SQS queue
+    :type sqs_queue: str
+    :param max_messages: The maximum number of messages to retrieve for each poke
+    :type max_messages: int
+    """
+
+    template_fields = ('sqs_queue', 'max_messages')
+
+    @apply_defaults
+    def __init__(self, sqs_queue, aws_conn_id='aws_default', max_messages=5, *args, **kwargs):
+        super(SQSSensor, self).__init__(*args, **kwargs)
+        self.sqs_queue = sqs_queue
+        self.aws_conn_id = aws_conn_id
+        self.max_messages = max_messages
+
+    def poke(self, context):
+        """
+        Check for message on subscribed queue and write to xcom the message with key ``messages``
+
+        :param context: the context object
+        :type context: dict
+        :return: ``True`` if message is available or ``False``
+        """
+
+        sqs_hook = SQSHook(aws_conn_id=self.aws_conn_id)
+        sqs_conn = sqs_hook.get_conn()
+
+        self.log.info('SQSSensor checking for message on queue: %s', self.sqs_queue)
+
+        messages = sqs_conn.receive_message(QueueUrl=self.sqs_queue,
+                                            MaxNumberOfMessages=self.max_messages)
 
 Review comment:
   We should probably pass `WaitTimeSeconds` argument here if the sensor mode is not reschedule.

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