In this module we will test the serverless application by sending a message to the newly created SQS queue so we can observe it triggering the Lambda function and publishing the result into the S3 bucket.

Implementation

Use the following command to get the SQS URL and store it in $SQS_URL environment variable

SQS_URL=$(aws sqs list-queues --output json | jq -r '.QueueUrls|map(select(contains("test-sqs-lambda-s3"))) | .[0]' | tr -d '[:space:]')

The command will only store the first url that contains test-sqs-lambda-s3 in the name. Validate you have the correct url:

echo $SQS_URL

Send a message to the queue.

aws sqs send-message --queue-url $SQS_URL --message-body abc

Or send 100 messages to the queue.

for i in {1..100}; do aws sqs send-message --queue-url $SQS_URL --message-body abc ; done

Navigate to the AWS console and observe the SQS triggering the Lambda, and publishing the result in the S3 bucket.

Conclusion

In this module, we tested the serverless application by sending messages to the SQS queue to verify that it triggers the Lambda function and publishes the result to the S3 bucket.