sqs_count_custom_metric.py

"""
 Copyright (c) 2018 MeteoGroup Deutschland GmbH

 Licensed 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 logging
import os
import time

import boto3

from log.LoggingInitializer import LoggingInitializer


def main():
    LoggingInitializer.setup_once()
    log_level = os.getenv("LOG_LEVEL", logging.INFO)
    logger = logging.getLogger(__name__)
    logger.setLevel(log_level)

    wait_time_in_seconds = int(os.getenv("WAIT_TIME_IN_SECONDS", 10))
    queue_name = os.getenv("QUEUE_NAME")
    environment = os.getenv("ENVIRONMENT") \
        or os.getenv('stage') \
        or os.getenv('env')
    namespace = os.getenv("METRICS_NAMESPACE")

    logger.info("Starting up with "
                "WAIT_TIME_IN_SECONDS: {} | "
                "QUEUE_NAME: {} | "
                "ENVIRONMENT: {} | "
                "METRICS_NAMESPACE: {}".format(
                    wait_time_in_seconds,
                    queue_name,
                    environment,
                    namespace
    ))

    while True:
        try:
            sqs_count_custom_metric(queue_name, environment,
                                    namespace, log_level)
        except Exception as e:
            logger.error(str(e))
        time.sleep(wait_time_in_seconds)


def sqs_count_custom_metric(queue_name, environment, namespace, log_level):
    sqs = boto3.resource('sqs')
    cloudwatch = boto3.client('cloudwatch')

    queue = sqs.get_queue_by_name(QueueName=queue_name)
    msg_count = queue.attributes.get('ApproximateNumberOfMessages')

    # Send to Custom SQS Metrics
    cloudwatch.put_metric_data(
        MetricData=[
            {
                'MetricName': 'ApproximateNumberOfMessages',
                'Dimensions': [
                    {
                        'Name': 'QueueName',
                        'Value': queue_name
                    },
                    {
                        'Name': 'env',
                        'Value': environment
                    },

                ],
                'Unit': 'None',
                'Value': float(msg_count)
            },
        ],
        Namespace=namespace
    )
    logger = logging.getLogger(__name__)
    logger.setLevel(log_level)
    logger.debug("Sent another probe to {}: "
                 "ApproximateNumberOfMessages = {}"
                 .format(namespace, msg_count))
    return msg_count


if __name__ == '__main__':
    main()