handler.py

def lambda_handler(event, context):
    """
    Main event handler, calls thumbor with received event.
    """
    try:
        start_time = timeit.default_timer()
        global log_level
        log_level = str(os.environ.get('LOG_LEVEL')).upper()
        if log_level not in [
                                'DEBUG', 'INFO',
                                'WARNING', 'ERROR',
                                'CRITICAL'
                            ]:
            log_level = 'ERROR'
        logging.getLogger().setLevel(log_level)

        if event['requestContext']['httpMethod'] != 'GET' and\
           event['requestContext']['httpMethod'] != 'HEAD':
            return response_formater(status_code=405)
        result = call_thumbor(event)
        if str(os.environ.get('SEND_ANONYMOUS_DATA')).upper() == 'YES':
            send_metrics(event, result, start_time)

        # save image to other bucket before exiting
        if result['statusCode'] == 200:
            import boto3
            # check event context for API method and use that
            # to decide what bucket to write to
            # TODO: something you would implement
            bucket = derive_bucket_from_event(event)
            prefix = os.path.basename(event['path'])
            s3 = boto3.resource('s3')
            s3.Object(bucket, prefix).put(Body=result['body'])
        return result
    except Exception as error:
        logging.error('lambda_handler error: %s' % (error))
        logging.error('lambda_handler trace: %s' % traceback.format_exc())
        return response_formater(status_code='500',
                                 cache_control='no-cache,no-store')