mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-18 16:47:18 +02:00
115 lines
2.9 KiB
Go
115 lines
2.9 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"context"
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"fmt"
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"log"
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"net/http"
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"sync"
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"time"
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"go.opentelemetry.io/otel/exporters/metric/prometheus"
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"go.opentelemetry.io/otel/global"
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"go.opentelemetry.io/otel/label"
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"go.opentelemetry.io/otel/metric"
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)
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var (
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lemonsKey = label.Key("ex.com/lemons")
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)
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func initMeter() {
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exporter, err := prometheus.InstallNewPipeline(prometheus.Config{})
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if err != nil {
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log.Panicf("failed to initialize prometheus exporter %v", err)
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}
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http.HandleFunc("/", exporter.ServeHTTP)
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go func() {
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_ = http.ListenAndServe(":2222", nil)
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}()
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fmt.Println("Prometheus server running on :2222")
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}
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func main() {
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initMeter()
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meter := global.Meter("ex.com/basic")
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observerLock := new(sync.RWMutex)
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observerValueToReport := new(float64)
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observerLabelsToReport := new([]label.KeyValue)
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cb := func(_ context.Context, result metric.Float64ObserverResult) {
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(*observerLock).RLock()
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value := *observerValueToReport
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labels := *observerLabelsToReport
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(*observerLock).RUnlock()
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result.Observe(value, labels...)
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}
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_ = metric.Must(meter).NewFloat64ValueObserver("ex.com.one", cb,
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metric.WithDescription("A ValueObserver set to 1.0"),
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)
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valuerecorder := metric.Must(meter).NewFloat64ValueRecorder("ex.com.two")
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counter := metric.Must(meter).NewFloat64Counter("ex.com.three")
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commonLabels := []label.KeyValue{lemonsKey.Int(10), label.String("A", "1"), label.String("B", "2"), label.String("C", "3")}
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notSoCommonLabels := []label.KeyValue{lemonsKey.Int(13)}
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ctx := context.Background()
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(*observerLock).Lock()
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*observerValueToReport = 1.0
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*observerLabelsToReport = commonLabels
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(*observerLock).Unlock()
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meter.RecordBatch(
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ctx,
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commonLabels,
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valuerecorder.Measurement(2.0),
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counter.Measurement(12.0),
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)
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time.Sleep(5 * time.Second)
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(*observerLock).Lock()
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*observerValueToReport = 1.0
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*observerLabelsToReport = notSoCommonLabels
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(*observerLock).Unlock()
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meter.RecordBatch(
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ctx,
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notSoCommonLabels,
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valuerecorder.Measurement(2.0),
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counter.Measurement(22.0),
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)
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time.Sleep(5 * time.Second)
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(*observerLock).Lock()
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*observerValueToReport = 13.0
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*observerLabelsToReport = commonLabels
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(*observerLock).Unlock()
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meter.RecordBatch(
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ctx,
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commonLabels,
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valuerecorder.Measurement(12.0),
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counter.Measurement(13.0),
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)
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fmt.Println("Example finished updating, please visit :2222")
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select {}
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}
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