mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-14 10:13:10 +02:00
ce49579d66
* The exp.Stop() as argument to handleErr is getting executed immediately. Wrap this with an anonymous func so that this argument is executed when the defer statement is activated. * From the "Tour of Go" docs on Defer: "The deferred call's arguments are evaluated immediately, but the function call is not executed until the surrounding function returns."
117 lines
3.3 KiB
Go
117 lines
3.3 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.
|
|
//
|
|
// Example application showcasing opentelemetry Go using the OTLP wire
|
|
// protocol
|
|
|
|
package main
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"log"
|
|
"time"
|
|
|
|
"go.opentelemetry.io/otel/api/global"
|
|
"go.opentelemetry.io/otel/api/kv"
|
|
"go.opentelemetry.io/otel/api/metric"
|
|
"go.opentelemetry.io/otel/exporters/otlp"
|
|
"go.opentelemetry.io/otel/sdk/metric/controller/push"
|
|
"go.opentelemetry.io/otel/sdk/metric/selector/simple"
|
|
sdktrace "go.opentelemetry.io/otel/sdk/trace"
|
|
)
|
|
|
|
// Initializes an OTLP exporter, and configures the corresponding trace and
|
|
// metric providers.
|
|
func initProvider() (*otlp.Exporter, *push.Controller) {
|
|
exp, err := otlp.NewExporter(
|
|
otlp.WithInsecure(),
|
|
otlp.WithAddress("localhost:55680"),
|
|
)
|
|
handleErr(err, "Failed to create exporter: $v")
|
|
|
|
traceProvider, err := sdktrace.NewProvider(
|
|
sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
|
|
sdktrace.WithSyncer(exp),
|
|
)
|
|
handleErr(err, "Failed to create trace provider: %v")
|
|
|
|
pusher := push.New(
|
|
simple.NewWithExactDistribution(),
|
|
exp,
|
|
push.WithStateful(true),
|
|
push.WithPeriod(2*time.Second),
|
|
)
|
|
|
|
global.SetTraceProvider(traceProvider)
|
|
global.SetMeterProvider(pusher.Provider())
|
|
pusher.Start()
|
|
|
|
return exp, pusher
|
|
}
|
|
|
|
func main() {
|
|
exp, pusher := initProvider()
|
|
defer func() { handleErr(exp.Stop(), "Failed to stop exporter") }()
|
|
defer pusher.Stop() // pushes any last exports to the receiver
|
|
|
|
tracer := global.Tracer("mage-sense")
|
|
meter := global.Meter("mage-read")
|
|
|
|
// labels represent additional descriptors that can be bound to a metric
|
|
// observer or recorder. In this case they describe the location in
|
|
// which a spell scroll is scribed.
|
|
commonLabels := []kv.KeyValue{
|
|
kv.String("work-room", "East Scriptorium"),
|
|
kv.String("occupancy", "69,105"),
|
|
kv.String("priority", "Ultra"),
|
|
}
|
|
|
|
// Observer metric example
|
|
oneMetricCB := func(_ context.Context, result metric.Float64ObserverResult) {
|
|
result.Observe(1, commonLabels...)
|
|
}
|
|
_ = metric.Must(meter).NewFloat64ValueObserver("scrying.glass.one", oneMetricCB,
|
|
metric.WithDescription("A ValueObserver set to 1.0"),
|
|
)
|
|
|
|
// Recorder metric example
|
|
valuerecorder := metric.Must(meter).
|
|
NewFloat64ValueRecorder("scrying.glass.two").
|
|
Bind(commonLabels...)
|
|
defer valuerecorder.Unbind()
|
|
|
|
// work begins
|
|
ctx, span := tracer.Start(context.Background(), "Archmage-Overlord-Inspection")
|
|
for i := 0; i < 10; i++ {
|
|
_, innerSpan := tracer.Start(ctx, fmt.Sprintf("Minion-%d", i))
|
|
log.Println("Minions hard at work, scribing...")
|
|
valuerecorder.Record(ctx, float64(i)*1.5)
|
|
|
|
<-time.After(time.Second)
|
|
innerSpan.End()
|
|
}
|
|
|
|
span.End()
|
|
<-time.After(time.Second)
|
|
|
|
log.Println("Spell-scroll scribed!")
|
|
}
|
|
|
|
func handleErr(err error, message string) {
|
|
if err != nil {
|
|
log.Fatalf("%s: %v", message, err)
|
|
}
|
|
}
|