13.5. Configuring AWS Lambda: Configuring triggers and events for Lambda functions

AWS Lambda is a serverless computing service that lets you run your code without provisioning or managing servers. With AWS Lambda, you can run code for virtually any type of application or backend service without administration. Just upload your code and Lambda takes care of everything needed to run and scale your code with high availability.

Configuring Triggers

AWS Lambda triggers are specific actions that can start a Lambda function to run. These triggers can be a modification to an S3 object, a change to a DynamoDB table, a custom event generated by your applications, and more.

To configure a trigger, you first need to create a Lambda function. Once created, you can add triggers to the function. In the AWS Lambda console, on the function configuration page, you must select the "Add trigger" option. Next, you must select the trigger type, such as S3, DynamoDB, etc., and configure the specific properties for that trigger type.

Configuring Events for Lambda Functions

Events are JSON objects that contain information about the change in the environment that triggered the Lambda function. They can contain information about a modification to an S3 object, a change to a DynamoDB table, a custom event raised by your applications, etc.

To configure events for a Lambda function, you must first create a Lambda function. Once created, you can add events to the function. In the AWS Lambda console, on the function configuration page, you must select the "Add event" option. Then you must select the event type, such as S3, DynamoDB, etc., and configure the specific properties for that event type.

Trigger and Event Configuration Example

Let's consider an example where we are configuring a trigger and event for a Lambda function that fires whenever a new file is uploaded to an S3 bucket.

First, we create the Lambda function in the AWS Lambda console. Then, on the function configuration page, we select the "Add trigger" option. From the drop-down menu we select "S3". We then configure the trigger properties to indicate that we want the Lambda function to fire whenever a new file is uploaded to the S3 bucket.

Next, we add an event to the function. On the function configuration page, we select the "Add event" option. From the drop-down menu we select "S3". We then configure the event properties to indicate that we want the Lambda function to receive information about the new file uploaded to the S3 bucket.

With this, whenever a new file is uploaded to the S3 bucket, the Lambda function will be triggered and receive information about the uploaded file.

Conclusion

Configuring triggers and events for Lambda functions is an important part of developing serverless applications with AWS Lambda. Enables you to create reactive applications that respond to changes in your environment quickly and efficiently. With the right configuration of triggers and events, you can build robust, scalable, and highly available applications with AWS Lambda.