Amazon S3 service is used for file storage, where you can upload or remove files. We can trigger AWS Lambda on S3 when there are any file uploads in S3 buckets. AWS Lambda has a handler function which acts as a start point for AWS Lambda function. The handler has the details of the events. In this chapter, let us see how to use AWS S3 to trigger AWS Lambda function when we upload files in S3 bucket.
Steps for Using AWS Lambda Function with Amazon S3
To start using AWS Lambda with Amazon S3, we need the following −
Create S3 Bucket
Create role which has permission to work with s3 and lambda
Create lambda function and add s3 as the trigger.
Example
Let us see these steps with the help of an example which shows the basic interaction between Amazon S3 and AWS Lambda.
User will upload a file in Amazon S3 bucket
Once the file is uploaded, it will trigger AWS Lambda function in the background which will display an output in the form of a console message that the file is uploaded.
The user will be able to see the message in Cloudwatch logs once the file is uploaded.
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