add tracing example for grpc

.example/net/gtrace/1.http/client/main.go

@@ -32,15 +32,20 @@ func initTracer() func() {
 	return flush
 }
 
-func main() {
-	flush := initTracer()
-	defer flush()
-
-	ctx, span := gtrace.Tracer().Start(context.Background(), "test")
+func StartRequests() {
+	ctx, span := gtrace.Tracer().Start(context.Background(), "StartRequests")
 	defer span.End()
 
 	ctx = baggage.ContextWithValues(ctx, label.String("name", "john"))
 	client := g.Client().Use(ghttp.MiddlewareClientTracing)
+
 	content := client.Ctx(ctx).GetContent("http://127.0.0.1:8199/hello")
-	g.Log().Print(content)
+	g.Log().Ctx(ctx).Print(content)
+}
+
+func main() {
+	flush := initTracer()
+	defer flush()
+
+	StartRequests()
 }

.example/net/gtrace/4.http+db+redis+log/client/main.go

@@ -30,15 +30,11 @@ func initTracer() func() {
 	return flush
 }
 
-func main() {
-	flush := initTracer()
-	defer flush()
-
-	ctx, span := gtrace.Tracer().Start(context.Background(), "root")
+func StartRequests() {
+	ctx, span := gtrace.Tracer().Start(context.Background(), "StartRequests")
 	defer span.End()
 
 	client := g.Client().Use(ghttp.MiddlewareClientTracing)
-	//client := g.Client()
 	// Add user info.
 	idStr := client.Ctx(ctx).PostContent(
 		"http://127.0.0.1:8199/user/insert",
@@ -69,3 +65,10 @@ func main() {
 	)
 	g.Log().Ctx(ctx).Print("delete:", idStr, deleteResult)
 }
+
+func main() {
+	flush := initTracer()
+	defer flush()
+
+	StartRequests()
+}

.example/net/gtrace/5.grpc+db+redis+log/client/main.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"context"
+	"github.com/gogf/gf/.example/net/gtrace/5.grpc+db+redis+log/protobuf/user"
+	"github.com/gogf/gf/frame/g"
+	"github.com/gogf/gf/net/gtrace"
+	"go.opentelemetry.io/otel/exporters/trace/jaeger"
+	sdkTrace "go.opentelemetry.io/otel/sdk/trace"
+	"google.golang.org/grpc"
+)
+
+const (
+	JaegerEndpoint = "http://localhost:14268/api/traces"
+	ServiceName    = "tracing-grpc-client"
+)
+
+// initTracer creates a new trace provider instance and registers it as global trace provider.
+func initTracer() func() {
+	// Create and install Jaeger export pipeline.
+	flush, err := jaeger.InstallNewPipeline(
+		jaeger.WithCollectorEndpoint(JaegerEndpoint),
+		jaeger.WithProcess(jaeger.Process{
+			ServiceName: ServiceName,
+		}),
+		jaeger.WithSDK(&sdkTrace.Config{DefaultSampler: sdkTrace.AlwaysSample()}),
+	)
+	if err != nil {
+		g.Log().Fatal(err)
+	}
+	return flush
+}
+
+func StartRequests() {
+	ctx, span := gtrace.Tracer().Start(context.Background(), "StartRequests")
+	defer span.End()
+
+	conn, err := grpc.Dial(":8000", grpc.WithInsecure(), grpc.WithBlock())
+	if err != nil {
+		g.Log().Fatalf("did not connect: %v", err)
+	}
+	defer conn.Close()
+
+	client := user.NewUserClient(conn)
+
+	// Insert.
+	insertRes, err := client.Insert(ctx, &user.InsertReq{
+		Name: "john",
+	})
+	if err != nil {
+		g.Log().Ctx(ctx).Fatalf(`%+v`, err)
+	}
+	g.Log().Ctx(ctx).Println("insert:", insertRes.Id)
+
+	// Query.
+	queryRes, err := client.Query(ctx, &user.QueryReq{
+		Id: insertRes.Id,
+	})
+	if err != nil {
+		g.Log().Ctx(ctx).Fatalf(`%+v`, err)
+	}
+	g.Log().Ctx(ctx).Println("query:", queryRes)
+
+	// Delete.
+	_, err = client.Delete(ctx, &user.DeleteReq{
+		Id: insertRes.Id,
+	})
+	if err != nil {
+		g.Log().Ctx(ctx).Fatalf(`%+v`, err)
+	}
+	g.Log().Ctx(ctx).Println("delete:", "ok")
+
+}
+
+func main() {
+	flush := initTracer()
+	defer flush()
+
+	StartRequests()
+}