S3 and Lambda Integration

Your Lambda function can be called using Amazon S3. Here, the event data is passed as a parameter. This integration enables you to write Lambda functions that process Amazon S3 events, for example, when a new S3 bucket gets created and you want to take an action. You can write a Lambda function and invoke it based on the activity from Amazon S3:

Figure 2.13: Demonstrating the integration of AWS S3 with AWS Lambda

Exercise 3: Writing a Lambda Function to Read a Text File

In this exercise, we will demonstrate AWS S3 integration with the AWS Lambda service. We will create an S3 bucket and load a text file. Then, we will write a Lambda function to read that text file. You will see an enhancement for this demonstration later in this chapter when we integrate it further with the API Gateway service to show the output of that text file as an API response.

Here are the steps to perform this exercise:

Note

Observe the contents of this file's text message: Welcome to Lambda and...