#Polling in sqs queue python code

The data to be sent as messages will be the current time when the function is executed. The get_queue_by_name method specifies the SQS queue described above, and the send_messages method sends messages to the queue. Queue = sqs.get_queue_by_name(QueueName=queue_name) Sqs = boto3.resource( 'sqs', region_name=region_name) import boto3ĭef lambda_handler (event, context): queue_name = os.environ Lambda1 describes the function to be executed inline.

#Polling in sqs queue python code

Resources: Queue: Type: AWS::SQS::Queue Properties: QueueName: !Sub $-function1 Handler: !Ref Handler MemorySize: !Ref MemorySize Runtime: !Ref Runtime Role: !GetAtt LambdaRole1.Arn Code language: YAML ( yaml )įor more information on the basics of Lambda functions, please refer to the following page. The key points when creating a queue are polling settings and visibility timeout. Basics of SQS are polling settings and visibility timeoutįirst, we need to check the SQS queue. Let’s take a look at the key points of each template file to configure this architecture. Join the conversation in our Gitter channel or open a GitHub Explanation of key points of template file Let us know what you think about the new queue poller. This allows you to manually delete the messages using ') You can skip message deletion by passing skip_delete: true. Messages are deleted from the queue when the block returns normally. If you change the visibility timeout of a message to zero, it will return to the queue immediately. Poller.change_message_visibility(msg, 60) This is useful when you need more time to finish processing the message. You can reset the visibility timeout of a single message by calling #change_message_visibility. Poller.poll(visibility_timeout:10) do |msg| You can provide an alternative visibility timeout when polling. By default, the queue’s VisibilityTimeout attribute is used. When receiving messages, you have a fixed amount of time to process and delete each message before it is added back into the queue. The maximum value for :max_number_of_messages is enforced by Amazon SQS. Poller.poll(max_number_of_messages:10) do |messages| # receives and yields up to 10 messages at a time When this is set to a positive value, greater than 1, the block will receive an array of messages, instead of a single message. You can specify a maximum number of messages to receive with each polling attempt via :max_number_of_messages. This will trigger significantly more API calls. When disabling :wait_time_seconds by passing nil, you must ensure the queue ReceiveMessageWaitTimeSeconds attribute is set to a non zero value, or you will be short polling.

Poller.poll(wait_time_seconds:nil) do |msg| # disables 20 second default, use queue ReceiveMessageWaitTimeSeconds attribute If you prefer to use the queue default wait time, then pass a nil value for :wait_time_seconds. This method will force a default :wait_time_seconds of 20 seconds. Long Pollingīy default, messages are received using long polling. This tool supports receiving and deleting messages in batches, long-polling, client-side tracking of stats, and more. Messages are automatically deleted from the queue at the end of the block. poller = Aws::SQS::QueuePoller.new(queue_url) We’ve recently added a utility class to the AWS SDK for Ruby that makes it easy to poll an Amazon SQS queue for messages.