sqs-polling 0.1.0

Polls AWS SQS messages and executes your callback.

sqs-polling

sqs-polling is simple AWS SQS daemon. The following is all.

• Polls SQS at regular intervals.
• Receives messages and executes your callback.
• If your callback function returns True, deletes the message.

Installation

$ pip install sqs-polling

Usage

The key function is sqs_polling, please check its interface.

The simplest usage is below.

from sqs_polling import sqs_polling


def your_callback(message, greeting):
    print(greeting + message["name"])
    return True


your_queue_url="https://sqs.your-region.amazonaws.com/XXXXXXXXXXXX/your-sqs",
sqs_polling(queue_url=your_queue_url, callback=your_callback, callback_args={"greeting": "Hello, "})

Callback

Your callback function must return 1 bool value. If True, deletes the processed message. If False, the message is remaining in your SQS and reprocessed after visibility_timeout seconds. It is recommended to return False if message processing fails.

Configuration

AWS account profile

In the example above, explicit AWS account profiles is omitted.

If explicit authentication is required, you can access SQS by setting additional profiles in aws_profile_dict argument.

your_aws_profile = {
    "region_name": "your-region",
    "aws_access_key_id": "XXXXXXXXXXXXXXXXXXXX",
    "aws_secret_access_key": "YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY",
}

sqs_polling(queue_url=your_queue_url, callback=your_callback, aws_profile_dict=your_aws_profile)

Polling

The arguments related to polling settings are as follows.

• extract_body: Whether to extract the message body. (default: True)
  • The body here refers to $.Messages.Body JSON element of SQS messages.
• interval_seconds: Message reception interval seconds. (default: 1.0)
• visibility_timeout: Message visibility timeout seconds. (default: 300)

Concurrency

sqs-polling can process messages in parallel using threads or processes. It can be controlled by the following arguments.

• max_workers: Max number of concurrent threads or processes. (default: 1)
• process_worker: If this is True, processes is used instead of threads. (default: False)

# Parallel processing with up to 64 threads.
sqs_polling(queue_url=your_queue_url, callback=your_callback, max_workers=64)

# Parallel processing with up to 4 processes.
sqs_polling(queue_url=your_queue_url, callback=your_callback, process_worker=True, max_workers=4)