def history()

in flask/utils.py [0:0]

• 17 lines of code
• 5 McCabe index (conditional complexity)

def history(dynamodb_client, table_name, metric, i, interval=50):
    """
    Returns an event's history (items in a DynamoDB table) as a DataFrame
    :param dynamodb_client: Connection to DynamoDB service
    :param table_name: Name of DynamoDB table (string)
    :param metric: Name of metric subtopic (string)
    :param i: ID of message payload (integer)
    :param interval: Interval of history (integer)
    :return: A DataFrame
    """
    records = []
    if i > interval:
        floor = i - interval
    else:
        floor = 0
    response = dynamodb_client.query(TableName=table_name, KeyConditionExpression="Metric = :metric AND ID > :floor",
                                     ExpressionAttributeValues={":metric": {"S": metric}, ":floor": {"N": str(floor)}})
    for n in range(0, interval - 1):
        record = response['Items'][n]['payload']['M']
        new_record = {}
        for key in record.keys():
            for dt in record[key]:
                new_record[key] = record[key][dt]
        records.append(new_record)
    metric_df = pd.DataFrame(records, dtype=float)
    return metric_df