AWS Lambda function Key Error with trigger on S3 - amazon-web-services

Question

Basic lambda function trying to get contents of the bucket but getting errors though
import json
import urllib.parse
import boto3
print('Loading function')
s3 = boto3.client('s3')
def lambda_handler(event, context):
#print("Received event: " + json.dumps(event, indent=2))
# Get the object from the event and show its content type
bucket = event['Records'][0]['s3']['bucket']['name']
key = urllib.parse.unquote_plus(event['Records'][0]['s3']['object']['key'], encoding='utf-8')
try:
response = s3.get_object(Bucket=bucket, Key=key)
print("CONTENT TYPE: " + response['ContentType'])
return response['ContentType']
except Exception as e:
print(e)
print('Error getting object {} from bucket {}. Make sure they exist and your bucket is in the same region as this function.'.format(key, bucket))
raise e
Here is the error message when i run the lambda function.
Error message
{
"errorMessage": "'Records'",
"errorType": "KeyError",
"requestId": "5c89bb8e-a70e-4c33-ba00-43174095544e",
"stackTrace": [
" File \"/var/task/lambda_function.py\", line 13, in lambda_handler\n bucket = event['Records'][0]['s3']['bucket']['name']\n"
]
}
Function Logs
START RequestId: 5c89bb8e-a70e-4c33-ba00-43174095544e Version: $LATEST
[ERROR] KeyError: 'Records'
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 13, in lambda_handler
    bucket = event['Records'][0]['s3']['bucket']['name']
END RequestId: 5c89bb8e-a70e-4c33-ba00-43174095544e
REPORT RequestId: 5c89bb8e-a70e-4c33-ba00-43174095544e Duration: 1.89 ms Billed Duration: 2 ms Memory Size: 128 MB Max Memory Used: 69 MB Init Duration: 356.28 ms

Answer 1

The problem is that
bucket = event['Records'][0]['s3']['bucket']['name']
Doesn't exist. Check the event object when its been triggered from S3. If you want to test in console you need to pass a similarly shaped object as the event.