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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
// Example using OTLP exporters + 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"
"os"
"os/signal"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/propagation"
sdkmetric "go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
"go.opentelemetry.io/otel/trace"
)
var serviceName = semconv.ServiceNameKey.String("test-service")
// Initialize a gRPC connection to be used by both the tracer and meter
// providers.
func initConn() (*grpc.ClientConn, error) {
// It connects the OpenTelemetry Collector through local gRPC connection.
// You may replace `localhost:4317` with your endpoint.
conn, err := grpc.NewClient("localhost:4317",
// Note the use of insecure transport here. TLS is recommended in production.
grpc.WithTransportCredentials(insecure.NewCredentials()),
)
if err != nil {
return nil, fmt.Errorf("failed to create gRPC connection to collector: %w", err)
}
return conn, err
}
// Initializes an OTLP exporter, and configures the corresponding trace provider.
func initTracerProvider(ctx context.Context, res *resource.Resource, conn *grpc.ClientConn) (func(context.Context) error, error) {
// Set up a trace exporter
traceExporter, err := otlptracegrpc.New(ctx, otlptracegrpc.WithGRPCConn(conn))
if err != nil {
return nil, fmt.Errorf("failed to create trace exporter: %w", err)
}
// Register the trace exporter with a TracerProvider, using a batch
// span processor to aggregate spans before export.
bsp := sdktrace.NewBatchSpanProcessor(traceExporter)
tracerProvider := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithResource(res),
sdktrace.WithSpanProcessor(bsp),
)
otel.SetTracerProvider(tracerProvider)
// Set global propagator to tracecontext (the default is no-op).
otel.SetTextMapPropagator(propagation.TraceContext{})
// Shutdown will flush any remaining spans and shut down the exporter.
return tracerProvider.Shutdown, nil
}
// Initializes an OTLP exporter, and configures the corresponding meter provider.
func initMeterProvider(ctx context.Context, res *resource.Resource, conn *grpc.ClientConn) (func(context.Context) error, error) {
metricExporter, err := otlpmetricgrpc.New(ctx, otlpmetricgrpc.WithGRPCConn(conn))
if err != nil {
return nil, fmt.Errorf("failed to create metrics exporter: %w", err)
}
meterProvider := sdkmetric.NewMeterProvider(
sdkmetric.WithReader(sdkmetric.NewPeriodicReader(metricExporter)),
sdkmetric.WithResource(res),
)
otel.SetMeterProvider(meterProvider)
return meterProvider.Shutdown, nil
}
func main() {
log.Printf("Waiting for connection...")
ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
defer cancel()
conn, err := initConn()
if err != nil {
log.Fatal(err)
}
res, err := resource.New(ctx,
resource.WithAttributes(
// The service name used to display traces in backends
serviceName,
),
)
if err != nil {
log.Fatal(err)
}
shutdownTracerProvider, err := initTracerProvider(ctx, res, conn)
if err != nil {
log.Fatal(err)
}
defer func() {
if err := shutdownTracerProvider(ctx); err != nil {
log.Fatalf("failed to shutdown TracerProvider: %s", err)
}
}()
shutdownMeterProvider, err := initMeterProvider(ctx, res, conn)
if err != nil {
log.Fatal(err)
}
defer func() {
if err := shutdownMeterProvider(ctx); err != nil {
log.Fatalf("failed to shutdown MeterProvider: %s", err)
}
}()
name := "go.opentelemetry.io/contrib/examples/otel-collector"
tracer := otel.Tracer(name)
meter := otel.Meter(name)
// Attributes represent additional key-value descriptors that can be bound
// to a metric observer or recorder.
commonAttrs := []attribute.KeyValue{
attribute.String("attrA", "chocolate"),
attribute.String("attrB", "raspberry"),
attribute.String("attrC", "vanilla"),
}
runCount, err := meter.Int64Counter("run", metric.WithDescription("The number of times the iteration ran"))
if err != nil {
log.Fatal(err)
}
// Work begins
ctx, span := tracer.Start(
ctx,
"CollectorExporter-Example",
trace.WithAttributes(commonAttrs...))
defer span.End()
for i := 0; i < 10; i++ {
_, iSpan := tracer.Start(ctx, fmt.Sprintf("Sample-%d", i))
runCount.Add(ctx, 1, metric.WithAttributes(commonAttrs...))
log.Printf("Doing really hard work (%d / 10)\n", i+1)
<-time.After(time.Second)
iSpan.End()
}
log.Printf("Done!")
}
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