| # Copyright 2015 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| # Disable the line-too-long warning. |
| # pylint: disable=C0301 |
| """This module implements the Chromium Performance Dashboard JSON v1.0 data |
| format. |
| |
| See http://www.chromium.org/developers/speed-infra/performance-dashboard/sending-data-to-the-performance-dashboard. |
| """ |
| |
| import json |
| from collections import defaultdict |
| |
| class ChartDataRecorder(object): |
| """Allows one to record measurement values one by one and then generate the |
| JSON string that represents them in the 'chart_data' format expected by the |
| performance dashboard. |
| """ |
| |
| def __init__(self): |
| self.charts = defaultdict(list) |
| |
| def record_scalar(self, chart_name, value_name, units, value): |
| """Records a single measurement value of a scalar type.""" |
| self.charts[chart_name].append({ |
| 'type': 'scalar', |
| 'name': value_name, |
| 'units': units, |
| 'value': value}) |
| |
| def get_json(self): |
| """Returns the JSON string representing the recorded chart data.""" |
| return json.dumps(self.charts) |
