/
main.go
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/
main.go
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// 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 using the OTLP exporter + collector + third-party backends. For
// information about using the exporter, see:
// https://pkg.go.dev/go.opentelemetry.io/otel/exporters/otlp?tab=doc#example-package-Insecure
package main
import (
"context"
"fmt"
"log"
"time"
"google.golang.org/grpc"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/otlp"
"go.opentelemetry.io/otel/exporters/otlp/otlpgrpc"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/metric/global"
"go.opentelemetry.io/otel/propagation"
controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
processor "go.opentelemetry.io/otel/sdk/metric/processor/basic"
"go.opentelemetry.io/otel/sdk/metric/selector/simple"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
"go.opentelemetry.io/otel/trace"
)
// Initializes an OTLP exporter, and configures the corresponding trace and
// metric providers.
func initProvider() func() {
ctx := context.Background()
// If the OpenTelemetry Collector is running on a local cluster (minikube or
// microk8s), it should be accessible through the NodePort service at the
// `localhost:30080` endpoint. Otherwise, replace `localhost` with the
// endpoint of your cluster. If you run the app inside k8s, then you can
// probably connect directly to the service through dns
driver := otlpgrpc.NewDriver(
otlpgrpc.WithInsecure(),
otlpgrpc.WithEndpoint("localhost:30080"),
otlpgrpc.WithDialOption(grpc.WithBlock()), // useful for testing
)
exp, err := otlp.New(ctx, driver)
handleErr(err, "failed to create exporter")
res, err := resource.New(ctx,
resource.WithAttributes(
// the service name used to display traces in backends
semconv.ServiceNameKey.String("test-service"),
),
)
handleErr(err, "failed to create resource")
bsp := sdktrace.NewBatchSpanProcessor(exp)
tracerProvider := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithResource(res),
sdktrace.WithSpanProcessor(bsp),
)
cont := controller.New(
processor.New(
simple.NewWithExactDistribution(),
exp,
),
controller.WithExporter(exp),
controller.WithCollectPeriod(2*time.Second),
)
// set global propagator to tracecontext (the default is no-op).
otel.SetTextMapPropagator(propagation.TraceContext{})
otel.SetTracerProvider(tracerProvider)
global.SetMeterProvider(cont.MeterProvider())
handleErr(cont.Start(context.Background()), "failed to start controller")
return func() {
// Push any last metric events to the exporter.
handleErr(cont.Stop(context.Background()), "failed to stop controller")
// Shutdown will flush any remaining spans and shut down the exporter.
handleErr(tracerProvider.Shutdown(ctx), "failed to shutdown TracerProvider")
}
}
func main() {
log.Printf("Waiting for connection...")
shutdown := initProvider()
defer shutdown()
tracer := otel.Tracer("test-tracer")
meter := global.Meter("test-meter")
// labels represent additional key-value descriptors that can be bound to a
// metric observer or recorder.
commonLabels := []attribute.KeyValue{
attribute.String("labelA", "chocolate"),
attribute.String("labelB", "raspberry"),
attribute.String("labelC", "vanilla"),
}
// Recorder metric example
valuerecorder := metric.Must(meter).
NewFloat64Counter(
"an_important_metric",
metric.WithDescription("Measures the cumulative epicness of the app"),
).Bind(commonLabels...)
defer valuerecorder.Unbind()
// work begins
ctx, span := tracer.Start(
context.Background(),
"CollectorExporter-Example",
trace.WithAttributes(commonLabels...))
defer span.End()
for i := 0; i < 10; i++ {
_, iSpan := tracer.Start(ctx, fmt.Sprintf("Sample-%d", i))
log.Printf("Doing really hard work (%d / 10)\n", i+1)
valuerecorder.Add(ctx, 1.0)
<-time.After(time.Second)
iSpan.End()
}
log.Printf("Done!")
}
func handleErr(err error, message string) {
if err != nil {
log.Fatalf("%s: %v", message, err)
}
}