s3-lambda.py

import boto3
import json


def lambda_handler(event, context):
    # i want to know that event thing
    print(event)

    # extract relevant information from the s3 event trigger
    bucket_name = event['Records'][0]['s3']['bucket']['name']
    object_key = event['Records'][0]['s3']['object']['key']

    # perform desired operations with the uploaded file
    print(f"File '{object_key}' was uploaded to bucket '{bucket_name}'")

    # example: send a notification via SNS
    sns_client = boto3.client('sns')
    topic_arn = 'arn:aws:sns:us-east-1:<account-id>:s3-lambda-sns'
    sns_client.publish(
        TopicArn=topic_arn,
        Subject='s3 object created !!',
        Message=f"File '{object_key}' was uploaded to bucket '{bucket_name}'"
    )

    # Example: Trigger another Lambda function
    # lambda_client = boto3.client('lambda')
    # target_function_name = 'my-another-lambda-function'
    # lambda_client.invoke(
    #     FunctionName=target_function_name,
    #     InvocationType='Event',
    #     Payload=json.dumps({'bucket_name': bucket_name, 'object_key': object_key})
    # )
    # in case of queuing and other objectives similar to the Netflix flow of triggering

    return {
        'statusCode': 200,
        'body': json.dumps("Lambda function executed successfully !!")
    }