AWS Lambda: Determine Event Source from event object. Based on this javascript gist https://gist.github.com/jeshan/52cb021fd20d871c56ad5ce6d2654d7b

get_lambda_event_source.py

def get_lambda_event_source(self, event: dict):
    if 'pathParameters' in event and 'proxy' in event['pathParameters']:
        return 'api_gateway_aws_proxy'
    if 'requestContext' in event and 'resourceId' in event['requestContext']:
        return 'api_gateway_http'
    elif 'Records' in event and len(event['Records']) > 0 and 'eventSource' in event['Records'][0] and event['Records'][0]['eventSource'] == 'aws:s3':
        return 's3'
    elif 'Records' in event and len(event['Records']) > 0 and 'EventSource' in event['Records'][0] and event['Records'][0]['EventSource'] == 'aws:sns':
        return 'sns'
    elif 'Records' in event and len(event['Records']) > 0 and 'eventSource' in event['Records'][0] and event['Records'][0]['eventSource'] == 'aws:dynamodb':
        return 'dynamo_db'
    elif 'Records' in event and len(event['Records']) > 0 and 'cf' in event['Records'][0]:
        return 'cloudfront'
    elif 'source' in event and event['source'] == 'aws.events':
        return 'scheduled_event'
    elif 'awslogs' in event and 'data' in event['awslogs']:
        return 'cloud_watch_logs'
    elif 'authorizationToken' in event and event['authorizationToken'] == "incoming-client-token":
        return 'api_gateway_authorizer'
    elif 'configRuleId' in event and 'configRuleName' in event and 'configRuleArn' in event:
        return 'aws_config'
    elif 'StackId' in event and 'RequestType' in event and 'ResourceType' in event:
        return 'cloud_formation'
    elif 'Records' in event and len(event['Records']) > 0 and 'eventSource' in event['Records'][0] and event['Records'][0]['eventSource'] == 'aws:codecommit':
        return 'code_commit'
    elif 'Records' in event and len(event['Records']) > 0 and 'eventSource' in event['Records'][0] and event['Records'][0]['eventSource'] == 'aws:ses':
        return 'ses'
    elif 'Records' in event and len(event['Records']) > 0 and 'eventSource' in event['Records'][0] and event['Records'][0]['eventSource'] == 'aws:kinesis':
        return 'kinesis'
    elif 'records' in event and len(event['Records']) > 0 and 'approximateArrivalTimestamp' in event['records'][0]:
        return 'kinesis_firehose'
    elif 'records' in event and len(event['Records']) > 0 and 'deliveryStreamArn' in event and event['deliveryStreamArn'] is str and event['deliveryStreamArn'].startswith('arn:aws:kinesis:'):
        return 'kinesis_firehose'
    elif 'eventType' in event and event['eventType'] == 'SyncTrigger' and 'identityId' in event and 'identityPoolId' in event:
        return 'cognito_sync_trigger'
    elif 'operation' in event and 'message' in event:
        return 'is_mobile_backend'

You seem to be missing SQS