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02-aws-lambda.md

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9.2 AWS Lambda

AWS Lambda is a serverless computing service that lets you execute code without worrying about managing servers. Here's an overview of how it works and its benefits:

Setting Up a Lambda Function 🛠️

  1. Accessing Lambda:

    • Go to the AWS Management Console and search for the Lambda service.

  2. Creating a Function:

    • Choose the Author from scratch option.
    • Name your function (e.g., mlzoomcamp-test).
    • Select the runtime environment (e.g., Python 3.9) and architecture (x86_64).

  3. Understanding Function Parameters:

    • event: Contains the input data passed to the function (e.g., a JSON payload).
    • context: Provides details about the invocation, configuration, and execution environment.

  4. Updating the Default Function:

    • Edit lambda_function.py with custom logic. Example: 
      def lambda_handler(event, context):
    print("Parameters:", event) # Print input parameters
    url = event["url"]  # Extract URL from input
    return {"prediction": "clothes"}  # Sample response

Testing and Deployment 🚀

  1. Create a Test Event:

    • Define a mock input to simulate real-world data.

  2. Deploy Changes:

    • Save and deploy the function to apply updates.

  3. Test Your Function:

    • Run the function with the test event to ensure it works as expected.

Advantages of AWS Lambda ✅

  • Serverless Architecture 🖥️: No need to provision or manage servers.
  • Cost-Effective 💰: Pay only for requests and compute time—idle time is free!
  • Automatic Scaling 📈: Adjusts automatically based on request volume.
  • Ease of Use 🎯: Focus on coding; AWS handles infrastructure.

Dynamic Link Management Use Case 🌐

AWS lambda was used to automatically redirect users to updated invite links for joining the DataTalks.Club community. This is to avoid expired links on the user side, by using a Lambda function that reads from a config file where invitation links can be update.

Free Tier Usage

Note that AWS Lambda offers a free tier that includes a certain number of free requests (1 million requests per month), and free compute time (400,000 GB-seconds per month).

Notes

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