Trouble Using AWS Lambda with S3 Event Notifications and Mapping Event Data
I'm a bit lost with Hey everyone, I'm running into an issue that's driving me crazy. I'm trying to set up an AWS Lambda function that is triggered by S3 event notifications when objects are created in a specific S3 bucket. I've configured the bucket to send notifications for 's3:ObjectCreated:*' events. However, I am struggling to correctly map the event data received by the Lambda function. The event payload seems to be coming through correctly, but when I log it, I see an unexpected structure that makes accessing the object details cumbersome. Here’s the relevant part of my Lambda function: ```python import json def lambda_handler(event, context): print("Received event:", json.dumps(event)) s3_bucket = event['Records'][0]['s3']['bucket']['name'] s3_key = event['Records'][0]['s3']['object']['key'] print(f'Bucket: {s3_bucket}, Key: {s3_key}') return { 'statusCode': 200, 'body': json.dumps('Success!') } ``` When I test this function with a simulated event, I get the following log output: ``` Received event: {"Records":[{"eventVersion":"2.1","eventSource":"aws:s3","awsRegion":"us-east-1","eventTime":"2023-10-15T12:00:00.000Z","eventName":"PutObject","userIdentity":{"principalId":"AWS:EXAMPLE"},"requestParameters":{"sourceIPAddress":"127.0.0.1"},"responseElements":{"x-amz-request-id":"EXAMPLE1234567890","x-amz-id-2":"EXAMPLE1234567890"},"s3":{"s3SchemaVersion":"1.0","configurationId":"exampleConfigId","bucket":{"name":"my-example-bucket","ownerIdentity":{"principalId":"EXAMPLE"},"arn":"arn:aws:s3:::my-example-bucket"},"object":{"key":"example-object.txt","size":12345,"eTag":"EXAMPLEETAG"}}}]} ``` I am able to extract the `bucket` and `object` details, but I need to ensure that my Lambda function can handle different types of S3 events and correctly identify the key and bucket name from the event payload regardless of its structure. I've also set the appropriate permissions in the IAM role associated with my Lambda function to allow it to read from the S3 bucket, but I'm concerned that if the structure of the S3 event changes in the future, my code might break. Has anyone encountered this issue? What best practices would you recommend for handling S3 event notifications in a more robust manner? Any insights or code snippets would be greatly appreciated! My development environment is Ubuntu. What am I doing wrong? Could someone point me to the right documentation? What's the best practice here? For context: I'm using Python on Windows 11. Thanks for any help you can provide!