Consider this Lambda function triggered by an S3 object creation event:

medium📝 Predict Output Q4 of 15

AWS - Serverless Architecture

def lambda_handler(event, context):
    bucket_name = event['Records'][0]['s3']['bucket']['name']
    object_key = event['Records'][0]['s3']['object']['key']
    return f"Bucket: {bucket_name}, Object: {object_key}"

If a file named 'report.csv' is uploaded to the bucket 'data-archive', what will the function return?

AAn error due to missing event data

B"Bucket: report.csv, Object: data-archive"

C"Bucket: data-archive, Object: null"

D"Bucket: data-archive, Object: report.csv"

Step-by-Step Solution

Solution:

Step 1: Analyze event structure
The event contains 'Records' with S3 bucket name and object key for the uploaded file.
Step 2: Map variables
bucket_name is assigned event['Records'][0]['s3']['bucket']['name'] which is 'data-archive'. object_key is assigned event['Records'][0]['s3']['object']['key'] which is 'report.csv'.
Step 3: Return value
The function returns the formatted string with these values.
Final Answer:
"Bucket: data-archive, Object: report.csv" -> Option D
Quick Check:
Bucket and object key extracted correctly from event [OK]

Quick Trick: Bucket and key come from event['Records'][0]['s3'] [OK]

Common Mistakes:

Swapping bucket name and object key
Assuming object key is missing
Expecting an error without event data

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Consider this Lambda function triggered by an S3 object creation event:

Step 1: Analyze event structure

Step 2: Map variables

Step 3: Return value

Final Answer:

Quick Check:

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