Question

How do I set up a Lambda function in AWS and trigger it with an S3 event?

Answer 1

Example Code (Python using Boto3):

import boto3

lambda_client = boto3.client('lambda')

response = lambda_client.create_function(
    FunctionName='my-function',
    Runtime='python3.8',
    Role='arn:aws:iam::123456789012:role/lambda-execution-role',
    Handler='lambda_function.lambda_handler',
    Code={
        'S3Bucket': 'bucket-name',
        'S3Key': 'lambda.zip'
    },
    Timeout=30,
    MemorySize=128
)

lambda_client.add_permission(
    FunctionName='my-function',
    StatementId='1',
    Action='lambda:InvokeFunction',
    Principal='s3.amazonaws.com',
    SourceArn='arn:aws:s3:::bucket-name',
)