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reporter.go
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reporter.go
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/*
* Copyright 2017 Google Inc.
*
* 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 telemetry
import (
"expvar"
"time"
"golang.org/x/net/context"
)
// Reporter aggregates telemetry registered with expvar and reports it to Sink endpoints
type Reporter interface {
Start(ctx context.Context)
}
type reporter struct {
period time.Duration
sinks []Sink
}
// NewReporter provides a time based Reporter
func NewReporter(period time.Duration, sinks ...Sink) Reporter {
return &reporter{period: period, sinks: sinks}
}
func (r *reporter) Start(ctx context.Context) {
ticker := time.NewTicker(r.period)
data := r.data()
for _, sink := range r.sinks {
sink.Init(data)
}
go func() {
for {
select {
case <-ticker.C:
r.report()
case <-ctx.Done():
r.report()
return
}
}
}()
}
func (r *reporter) report() {
data := r.data()
for _, sink := range r.sinks {
sink.Report(data)
}
}
func (r *reporter) data() []*expvar.KeyValue {
var points []*expvar.KeyValue
forEachMetric(func(point expvar.KeyValue) {
points = append(points, &point)
})
return points
}