lambda_s3_uploaded.py

import gzip
import json
import boto3

def lambda_handler(event, context):
    bucket_name = event['Records'][0]['s3']['bucket']['name']
    object_key = event['Records'][0]['s3']['object']['key']
    
    s3 = boto3.client('s3')
    res = s3.get_object(Bucket=bucket_name, Key=object_key)
    log = json.loads(gzip.decompress(res['Body'].read()).decode('utf-8'))
    
    print(json.dumps(log, indent=2))
    return log