| // Copyright 2016 The LUCI Authors. |
| // |
| // 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. |
| |
| package tsmon |
| |
| import ( |
| "context" |
| |
| "go.chromium.org/luci/common/tsmon/types" |
| ) |
| |
| // Callback is a function that is run at metric collection time to set the |
| // values of one or more metrics. A callback can be registered with |
| // RegisterCallback. |
| type Callback func(ctx context.Context) |
| |
| // A GlobalCallback is a Callback with the list of metrics it affects, so those |
| // metrics can be reset after they are flushed. |
| type GlobalCallback struct { |
| Callback |
| metrics []types.Metric |
| } |
| |
| // RegisterCallback registers a callback function that will be run at metric |
| // collection time to set the values of one or more metrics. RegisterCallback |
| // should be called from an init() function in your module. |
| func RegisterCallback(f Callback) { |
| RegisterCallbackIn(context.Background(), f) |
| } |
| |
| // RegisterCallbackIn is like RegisterCallback but registers in a given context. |
| func RegisterCallbackIn(ctx context.Context, f Callback) { |
| GetState(ctx).RegisterCallbacks(f) |
| } |
| |
| // RegisterGlobalCallback registers a callback function that will be run once |
| // per minute on *one* instance of your application. It is supported primarily |
| // on GAE. |
| // |
| // You must specify the list of metrics that your callback affects - these |
| // metrics will be reset after flushing to ensure they are not sent by multiple |
| // instances. |
| // |
| // RegisterGlobalCallback should be called from an init() function in your |
| // module. |
| func RegisterGlobalCallback(f Callback, metrics ...types.Metric) { |
| RegisterGlobalCallbackIn(context.Background(), f, metrics...) |
| } |
| |
| // RegisterGlobalCallbackIn is like RegisterGlobalCallback but registers in a |
| // given context. |
| func RegisterGlobalCallbackIn(ctx context.Context, f Callback, metrics ...types.Metric) { |
| if len(metrics) == 0 { |
| panic("RegisterGlobalCallback called without any metrics") |
| } |
| |
| GetState(ctx).RegisterGlobalCallbacks(GlobalCallback{f, metrics}) |
| } |