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opentelemetry-go/example/basic/main.go
Joshua MacDonald ee3c9ed1a5
Rename Observer to ValueObserver (#734)
* Observer -> ValueObserver

* Move wrappers into async.go
2020-05-18 11:03:43 -07:00

127 lines
3.6 KiB
Go

// Copyright The 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"
"go.opentelemetry.io/otel/api/correlation"
"go.opentelemetry.io/otel/api/global"
"go.opentelemetry.io/otel/api/kv"
"go.opentelemetry.io/otel/api/metric"
"go.opentelemetry.io/otel/api/trace"
metricstdout "go.opentelemetry.io/otel/exporters/metric/stdout"
tracestdout "go.opentelemetry.io/otel/exporters/trace/stdout"
"go.opentelemetry.io/otel/sdk/metric/controller/push"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
var (
fooKey = kv.Key("ex.com/foo")
barKey = kv.Key("ex.com/bar")
lemonsKey = kv.Key("ex.com/lemons")
anotherKey = kv.Key("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()}),
sdktrace.WithResourceAttributes(kv.String("rk1", "rv11"), kv.Int64("rk2", 5)))
if err != nil {
log.Panicf("failed to initialize trace provider %v", err)
}
global.SetTraceProvider(tp)
}
func initMeter() *push.Controller {
pusher, err := metricstdout.InstallNewPipeline(metricstdout.Config{
Quantiles: []float64{0.5, 0.9, 0.99},
PrettyPrint: false,
})
if err != nil {
log.Panicf("failed to initialize metric stdout exporter %v", err)
}
return pusher
}
func main() {
defer initMeter().Stop()
initTracer()
tracer := global.Tracer("ex.com/basic")
meter := global.Meter("ex.com/basic")
commonLabels := []kv.KeyValue{lemonsKey.Int(10), kv.String("A", "1"), kv.String("B", "2"), kv.String("C", "3")}
oneMetricCB := func(result metric.Float64ObserverResult) {
result.Observe(1, commonLabels...)
}
_ = metric.Must(meter).RegisterFloat64ValueObserver("ex.com.one", oneMetricCB,
metric.WithDescription("A ValueObserver set to 1.0"),
)
valuerecorderTwo := metric.Must(meter).NewFloat64ValueRecorder("ex.com.two")
ctx := context.Background()
ctx = correlation.NewContext(ctx,
fooKey.String("foo1"),
barKey.String("bar1"),
)
valuerecorder := valuerecorderTwo.Bind(commonLabels...)
defer valuerecorder.Unbind()
err := tracer.WithSpan(ctx, "operation", func(ctx context.Context) error {
trace.SpanFromContext(ctx).AddEvent(ctx, "Nice operation!", kv.Key("bogons").Int(100))
trace.SpanFromContext(ctx).SetAttributes(anotherKey.String("yes"))
meter.RecordBatch(
// Note: call-site variables added as context Entries:
correlation.NewContext(ctx, anotherKey.String("xyz")),
commonLabels,
valuerecorderTwo.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")
valuerecorder.Record(ctx, 1.3)
return nil
},
)
})
if err != nil {
panic(err)
}
}