Introduction to AWS Lambda

AWS Lambda is an event-driven, serverless computing platform that allows you to run code in response to events without provisioning or managing servers. It is part of the Amazon Web Services (AWS) suite of cloud services.

Creating Your First AWS Lambda Function

  import json

  def lambda_handler(event, context):
      return {
          'statusCode': 200,
          'body': json.dumps('Hello from Lambda!')
      }

Using AWS Lambda with API Gateway

AWS API Gateway is a service that makes it easy to create, publish, maintain, monitor, and secure APIs. You can integrate API Gateway with Lambda to create serverless REST APIs.

  import json

  def api_gateway_handler(event, context):
      return {
          'statusCode': 200,
          'body': json.dumps('Hello from API Gateway and Lambda!')
      }

Accessing AWS Services from Lambda

One of the powerful features of AWS Lambda is its integration with other AWS services, such as S3, DynamoDB, and more.

S3 Example

  import json
  import boto3

  s3 = boto3.client('s3')

  def s3_handler(event, context):
      bucket = 'my-bucket'
      key = 'my-object'
      response = s3.get_object(Bucket=bucket, Key=key)
      content = response['Body'].read().decode('utf-8')
      
      return {
          'statusCode': 200,
          'body': json.dumps(content)
      }

DynamoDB Example

  import json
  import boto3

  dynamodb = boto3.resource('dynamodb')
  table = dynamodb.Table('my-table')

  def dynamodb_handler(event, context):
      response = table.get_item(
          Key={
              'id': 'my-id'
          }
      )
      item = response.get('Item', {})
      
      return {
          'statusCode': 200,
          'body': json.dumps(item)
      }

Building an Application Using AWS Lambda

Let’s build a sample serverless application that uses several AWS Lambda functions to demonstrate their power and versatility.

Application Overview

Our application will consist of the following components:

• API Gateway to expose HTTP endpoints
• Lambda functions for handling requests
• S3 for object storage
• DynamoDB for data storage

Setting up API Gateway

  import json

  def api_gateway_entry_point(event, context):
      path = event['path']

      if path == '/get-object':
          return s3_handler(event, context)
      elif path == '/get-item':
          return dynamodb_handler(event, context)
      else:
          return {
              'statusCode': 404,
              'body': json.dumps('Path not found')
          }

Main Function

  import json

  def lambda_handler(event, context):
      return {
          'statusCode': 200,
          'body': json.dumps('Hello from Serverless Application!')
      }

By combining these Lambda functions with API Gateway, S3, and DynamoDB, you can create a scalable and maintainable serverless application. These examples should provide a solid foundation to get started with AWS Lambda and explore its capabilities further.

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