fastify sqs-consumer

Description

This plugin for fastify 4.x allows you to consume messages from AWS SQS queues. On fastify shutdown a simple wait function is called to wait for the end of the processing of the messages in progress.

Warning
To use this plugin, you must have correctly configured your AWS credentials.

Install

npm i @fgiova/fastify-sqs-consumer

Usage

const fastify = require("fastify")()

fastify.register(require("fastify-sqs-consumer"), [
    {
        url: "https://sqs.us-east-1.amazonaws.com/123456789012/MyQueue",
        waitTimeSeconds: 20,
        timeout: 10_000,
        batchSize: 10,
        handlerFunction: async (message, fastify) => {
            return true;
        }
    }
]);

Options

Options are an array of objects with the following properties (one more for each queue):

Option	Type	Description
url*	string	The URL of the Amazon SQS queue from which messages are received.
waitTimeSeconds	number	The duration (in seconds, default 20s) for which the call waits for a message to arrive in the queue before returning. If a message is available, the call returns sooner than WaitTimeSeconds. If no messages are available and the wait time expires, the call returns successfully with an empty list of messages.
timeout	number	The duration before the message is considered as failed: default 90000ms.
batchSize	number	The maximum number of messages to return. Amazon SQS never returns more messages than this value (however, fewer messages might be returned). Valid values: 1 to 10. Default: 1.
handlerFunction*	function	The function that will be called for each message.
messageAttributeNames	string[]	Array of caught message's attributes for each message
attributeNames	string[]	Array of caught queue's attributes for each message
events	object	Events functions for the consumer (detail in next table)
sqs	SQSClient	Initialized SQS Client (useful for testing sessions)

handlerFunction

Handler function is an async function called for each message received from the queue. Each Error thrown by the function is caught and the message is not deleted from the queue. Otherwise, the message is deleted from the queue.

Events

Event name	Arguments	Description
error	error Object	Fired when a general error occurs
processingError	error Object, message SQS.Message	Fired when an error occurs pending message handling
timeoutError	error Object, message SQS.Message	Fired when processing of message exceed timeout duration If function return false message are discarded, otherwise message is bounced to queue.
messageReceived	message SQS.Message	Fired when message is received
messageProcessed	message SQS.Message	Fired when message is successfully processed
responseProcessed	void	Fired after one batch of items (up to batchSize) has been successfully processed.
stopped	void	Fired when the consumer finally stops its work.
empty	void	Fired when the queue is empty (All messages have been consumed).

License

Licensed under MIT.

Acknowledgements

This project is kindly sponsored by: isendu Srl www.isendu.com

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