Added the files for this package.

examples/multi-services/back-svc/Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:1.22-alpine3.20
+WORKDIR /go/src/toastielab.dev/toastie-stuff/otelchi
+
+RUN apk --no-cache add curl
+COPY . .
+
+WORKDIR /go/src/toastielab.dev/toastie-stuff/otelchi/examples/multi-services
+RUN go mod download -x
+
+WORKDIR /go/src/toastielab.dev/toastie-stuff/otelchi/examples/multi-services/back-svc
+RUN go build -o server
+
+ENTRYPOINT ["./server"]

examples/multi-services/back-svc/main.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"math/rand"
+	"net/http"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"go.opentelemetry.io/otel/trace"
+
+	"toastielab.dev/toastie-stuff/otelchi"
+	"toastielab.dev/toastie-stuff/otelchi/examples/multi-services/utils"
+)
+
+const (
+	addr        = ":8091"
+	serviceName = "back-svc"
+)
+
+func main() {
+	// init tracer provider
+	tracer, err := utils.NewTracer(serviceName)
+	if err != nil {
+		log.Fatalf("unable to initialize tracer provider due: %v", err)
+	}
+
+	if err = utils.NewMeter(serviceName); err != nil {
+		log.Fatalf("unable to initialize meter provider due: %v", err)
+	}
+
+	// define router
+	r := chi.NewRouter()
+	r.Use(otelchi.Middleware(serviceName, otelchi.WithChiRoutes(r)))
+	r.Get("/", utils.HealthCheckHandler)
+	r.Get("/name", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(generateName(r.Context(), tracer)))
+	})
+	log.Printf("back service is listening on %v", addr)
+	err = http.ListenAndServe(addr, r)
+	if err != nil {
+		log.Fatalf("unable to execute server due: %v", err)
+	}
+}
+
+func generateName(ctx context.Context, tracer trace.Tracer) string {
+	_, span := tracer.Start(ctx, "generateName")
+	defer span.End()
+
+	rndNum := rand.New(rand.NewSource(time.Now().UnixNano())).Intn(100000)
+	return fmt.Sprintf("user_%v", rndNum)
+}