// Copyright 2019, OpenTelemetry 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 main import ( "context" "log" "time" "go.opentelemetry.io/otel/api/distributedcontext" "go.opentelemetry.io/otel/api/global" "go.opentelemetry.io/otel/api/key" "go.opentelemetry.io/otel/api/metric" "go.opentelemetry.io/otel/api/trace" metricstdout "go.opentelemetry.io/otel/exporter/metric/stdout" tracestdout "go.opentelemetry.io/otel/exporter/trace/stdout" metricsdk "go.opentelemetry.io/otel/sdk/metric" "go.opentelemetry.io/otel/sdk/metric/batcher/defaultkeys" "go.opentelemetry.io/otel/sdk/metric/controller/push" "go.opentelemetry.io/otel/sdk/metric/selector/simple" sdktrace "go.opentelemetry.io/otel/sdk/trace" ) var ( fooKey = key.New("ex.com/foo") barKey = key.New("ex.com/bar") lemonsKey = key.New("ex.com/lemons") anotherKey = key.New("ex.com/another") ) // initTracer creates and registers trace provider instance. func initTracer() { var err error exp, err := tracestdout.NewExporter(tracestdout.Options{PrettyPrint: false}) if err != nil { log.Panicf("failed to initialize trace stdout exporter %v", err) return } tp, err := sdktrace.NewProvider(sdktrace.WithSyncer(exp), sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()})) if err != nil { log.Panicf("failed to initialize trace provider %v", err) } global.SetTraceProvider(tp) } func initMeter() *push.Controller { selector := simple.NewWithExactMeasure() exporter, err := metricstdout.New(metricstdout.Options{ Quantiles: []float64{0.5, 0.9, 0.99}, PrettyPrint: false, }) if err != nil { log.Panicf("failed to initialize metric stdout exporter %v", err) } batcher := defaultkeys.New(selector, metricsdk.NewDefaultLabelEncoder(), true) pusher := push.New(batcher, exporter, time.Second) pusher.Start() global.SetMeterProvider(pusher) return pusher } func main() { defer initMeter().Stop() initTracer() // Note: Have to get the meter and tracer after the global is // initialized. See OTEP 0005. tracer := global.TraceProvider().Tracer("ex.com/basic") meter := global.MeterProvider().Meter("ex.com/basic") oneMetric := meter.NewFloat64Gauge("ex.com.one", metric.WithKeys(fooKey, barKey, lemonsKey), metric.WithDescription("A gauge set to 1.0"), ) measureTwo := meter.NewFloat64Measure("ex.com.two") ctx := context.Background() ctx = distributedcontext.NewContext(ctx, fooKey.String("foo1"), barKey.String("bar1"), ) commonLabels := meter.Labels(lemonsKey.Int(10), key.String("A", "1"), key.String("B", "2"), key.String("C", "3")) gauge := oneMetric.Bind(commonLabels) defer gauge.Unbind() measure := measureTwo.Bind(commonLabels) defer measure.Unbind() err := tracer.WithSpan(ctx, "operation", func(ctx context.Context) error { trace.SpanFromContext(ctx).AddEvent(ctx, "Nice operation!", key.New("bogons").Int(100)) trace.SpanFromContext(ctx).SetAttributes(anotherKey.String("yes")) gauge.Set(ctx, 1) meter.RecordBatch( // Note: call-site variables added as context Entries: distributedcontext.NewContext(ctx, anotherKey.String("xyz")), commonLabels, oneMetric.Measurement(1.0), measureTwo.Measurement(2.0), ) return tracer.WithSpan( ctx, "Sub operation...", func(ctx context.Context) error { trace.SpanFromContext(ctx).SetAttributes(lemonsKey.String("five")) trace.SpanFromContext(ctx).AddEvent(ctx, "Sub span event") measure.Record(ctx, 1.3) return nil }, ) }) if err != nil { panic(err) } }