Add resource detectors to accounting service (#676)

CHANGELOG.md

@@ -178,3 +178,5 @@ significant modifications will be credited to OpenTelemetry Authors.
 ([#664](https://github.com/open-telemetry/opentelemetry-demo/pull/664))
 * Update loadgenerator python base image and dependencies
 ([#669](https://github.com/open-telemetry/opentelemetry-demo/pull/669))
+* Add resource detectors to accounting service
+([#676](https://github.com/open-telemetry/opentelemetry-demo/pull/676))

docs/services/accountingservice.md

@@ -22,6 +22,7 @@ func initTracerProvider() (*sdktrace.TracerProvider, error) {
     }
     tp := sdktrace.NewTracerProvider(
         sdktrace.WithBatcher(exporter),
+        sdktrace.WithResource(initResource()),
     )
     otel.SetTracerProvider(tp)
     otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))

src/accountingservice/main.go

@@ -20,18 +20,22 @@ import (
 	"os"
 	"os/signal"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/sirupsen/logrus"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
 	"go.opentelemetry.io/otel/propagation"
+	sdkresource "go.opentelemetry.io/otel/sdk/resource"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 
 	"github.com/open-telemetry/opentelemetry-demo/src/accountingservice/kafka"
 )
 
 var log *logrus.Logger
+var resource *sdkresource.Resource
+var initResourcesOnce sync.Once
 
 func init() {
 	log = logrus.New()
@@ -47,6 +51,23 @@ func init() {
 	log.Out = os.Stdout
 }
 
+func initResource() *sdkresource.Resource {
+	initResourcesOnce.Do(func() {
+		extraResources, _ := sdkresource.New(
+			context.Background(),
+			sdkresource.WithOS(),
+			sdkresource.WithProcess(),
+			sdkresource.WithContainer(),
+			sdkresource.WithHost(),
+		)
+		resource, _ = sdkresource.Merge(
+			sdkresource.Default(),
+			extraResources,
+		)
+	})
+	return resource
+}
+
 func initTracerProvider() (*sdktrace.TracerProvider, error) {
 	ctx := context.Background()
 
@@ -56,6 +77,7 @@ func initTracerProvider() (*sdktrace.TracerProvider, error) {
 	}
 	tp := sdktrace.NewTracerProvider(
 		sdktrace.WithBatcher(exporter),
+		sdktrace.WithResource(initResource()),
 	)
 	otel.SetTracerProvider(tp)
 	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))