| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # |
| |
| from twitter.common.http import HttpServer |
| from twitter.common.http.server import request |
| from twitter.common.metrics import MetricSampler, RootMetrics |
| |
| |
| class VarsEndpoint(object): |
| """ |
| Wrap a MetricSampler to export the /vars endpoint for applications that register |
| exported variables. |
| """ |
| |
| def __init__(self, period=None, stats_filter=None): |
| self._metrics = RootMetrics() |
| self._stats_filter = stats_filter |
| if period is not None: |
| self._monitor = MetricSampler(self._metrics, period) |
| else: |
| self._monitor = MetricSampler(self._metrics) |
| self._monitor.start() |
| |
| @HttpServer.route("/vars") |
| @HttpServer.route("/vars/:var") |
| def handle_vars(self, var=None): |
| HttpServer.set_content_type('text/plain; charset=iso-8859-1') |
| filtered = self._parse_filtered_arg() |
| samples = self._monitor.sample() |
| |
| if var is None and filtered and self._stats_filter: |
| return '\n'.join( |
| '%s %s' % (key, val) for key, val in sorted(samples.items()) |
| if not self._stats_filter.match(key)) |
| elif var is None: |
| return '\n'.join( |
| '%s %s' % (key, val) for key, val in sorted(samples.items())) |
| else: |
| if var in samples: |
| return samples[var] |
| else: |
| HttpServer.abort(404, 'Unknown exported variable') |
| |
| @HttpServer.route("/vars.json") |
| def handle_vars_json(self, var=None, value=None): |
| filtered = self._parse_filtered_arg() |
| sample = self._monitor.sample() |
| if filtered and self._stats_filter: |
| return dict((key, val) for key, val in sample.items() if not self._stats_filter.match(key)) |
| else: |
| return sample |
| |
| def shutdown(self): |
| self._monitor.shutdown() |
| self._monitor.join() |
| |
| def _parse_filtered_arg(self): |
| return request.GET.get('filtered', '') in ('true', '1') |
