mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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6b48fce4ec
* example/basic: make basic example work - use stdout as exportor (otherwise no output when you run it) * meter does not work yet, rephrase TODO
116 lines
3.1 KiB
Go
116 lines
3.1 KiB
Go
// Copyright 2019, 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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"log"
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"go.opentelemetry.io/otel/api/distributedcontext"
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"go.opentelemetry.io/otel/api/key"
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"go.opentelemetry.io/otel/api/metric"
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"go.opentelemetry.io/otel/api/trace"
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"go.opentelemetry.io/otel/exporter/trace/stdout"
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"go.opentelemetry.io/otel/global"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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)
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var (
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fooKey = key.New("ex.com/foo")
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barKey = key.New("ex.com/bar")
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lemonsKey = key.New("ex.com/lemons")
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anotherKey = key.New("ex.com/another")
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)
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// initTracer creates and registers trace provider instance.
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func initTracer() {
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var err error
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exp, err := stdout.NewExporter(stdout.Options{PrettyPrint: false})
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if err != nil {
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log.Panicf("failed to initialize stdout exporter %v\n", err)
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return
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}
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tp, err := sdktrace.NewProvider(sdktrace.WithSyncer(exp),
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sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}))
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if err != nil {
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log.Panicf("failed to initialize trace provider %v\n", err)
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}
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global.SetTraceProvider(tp)
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}
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func main() {
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initTracer()
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tracer := global.TraceProvider().GetTracer("ex.com/basic")
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// TODO: Meter doesn't work yet, check if resources to be shared afterwards.
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meter := global.MeterProvider().GetMeter("ex.com/basic")
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oneMetric := meter.NewFloat64Gauge("ex.com.one",
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metric.WithKeys(fooKey, barKey, lemonsKey),
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metric.WithDescription("A gauge set to 1.0"),
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)
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measureTwo := meter.NewFloat64Measure("ex.com.two")
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ctx := context.Background()
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ctx = distributedcontext.NewContext(ctx,
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fooKey.String("foo1"),
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barKey.String("bar1"),
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)
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commonLabels := meter.Labels(lemonsKey.Int(10))
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gauge := oneMetric.AcquireHandle(commonLabels)
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defer gauge.Release()
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measure := measureTwo.AcquireHandle(commonLabels)
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defer measure.Release()
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err := tracer.WithSpan(ctx, "operation", func(ctx context.Context) error {
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trace.CurrentSpan(ctx).AddEvent(ctx, "Nice operation!", key.New("bogons").Int(100))
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trace.CurrentSpan(ctx).SetAttributes(anotherKey.String("yes"))
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gauge.Set(ctx, 1)
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meter.RecordBatch(
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// Note: call-site variables added as context Entries:
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distributedcontext.NewContext(ctx, anotherKey.String("xyz")),
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commonLabels,
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oneMetric.Measurement(1.0),
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measureTwo.Measurement(2.0),
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)
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return tracer.WithSpan(
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ctx,
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"Sub operation...",
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func(ctx context.Context) error {
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trace.CurrentSpan(ctx).SetAttribute(lemonsKey.String("five"))
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trace.CurrentSpan(ctx).AddEvent(ctx, "Sub span event")
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measure.Record(ctx, 1.3)
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return nil
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},
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)
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})
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if err != nil {
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panic(err)
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}
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}
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