package main import ( "context" "crypto/tls" "errors" "fmt" "io" "io/ioutil" "net/http" "strings" "time" "github.com/prometheus/client_golang/prometheus/promhttp" "github.com/spf13/cobra" "google.golang.org/grpc" "google.golang.org/grpc/metadata" greflectsvc "google.golang.org/grpc/reflection/grpc_reflection_v1alpha" "google.golang.org/protobuf/proto" "google.golang.org/protobuf/types/descriptorpb" "go.linka.cloud/grpc/client" "go.linka.cloud/grpc/interceptors/defaulter" metrics2 "go.linka.cloud/grpc/interceptors/metrics" validation2 "go.linka.cloud/grpc/interceptors/validation" "go.linka.cloud/grpc/logger" "go.linka.cloud/grpc/service" ) type GreeterHandler struct { UnimplementedGreeterServer } func hello(name string) string { return fmt.Sprintf("Hello %s !", name) } func (g *GreeterHandler) SayHello(ctx context.Context, req *HelloRequest) (*HelloReply, error) { return &HelloReply{Message: hello(req.Name)}, nil } func (g *GreeterHandler) SayHelloStream(req *HelloStreamRequest, s Greeter_SayHelloStreamServer) error { for i := int64(0); i < req.Count; i++ { if err := s.Send(&HelloReply{Message: fmt.Sprintf("Hello %s (%d)!", req.Name, i+1)}); err != nil { return err } // time.Sleep(time.Second) } return nil } func httpLogger(next http.Handler) http.Handler { return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) { start := time.Now() log := logger.From(request.Context()).WithFields( "method", request.Method, "host", request.Host, "path", request.URL.Path, "remoteAddress", request.RemoteAddr, ) next.ServeHTTP(writer, request) log.WithField("duration", time.Since(start)).Info() }) } func main() { f, opts := service.NewFlagSet() cmd := &cobra.Command{ Use: "example", Run: func(cmd *cobra.Command, args []string) { run(opts) }, } cmd.Flags().AddFlagSet(f) cmd.Execute() } func run(opts ...service.Option) { name := "greeter" version := "v0.0.1" secure := true ctx, cancel := context.WithCancel(context.Background()) defer cancel() log := logger.New().WithFields("service", name) ctx = logger.Set(ctx, log) done := make(chan struct{}) ready := make(chan struct{}) var svc service.Service var err error metrics := metrics2.NewInterceptors() validation := validation2.NewInterceptors(true) defaulter := defaulter.NewInterceptors() address := "0.0.0.0:9991" opts = append(opts, service.WithContext(ctx), service.WithName(name), service.WithVersion(version), service.WithAddress(address), // service.WithRegistry(mdns.NewRegistry()), service.WithReflection(true), service.WithSecure(secure), service.WithAfterStart(func() error { log.Info("Server listening on", svc.Options().Address()) close(ready) return nil }), service.WithAfterStop(func() error { log.Info("Stopping server") close(done) return nil }), service.WithGateway(RegisterGreeterHandler), service.WithGatewayPrefix("/rest"), service.WithGRPCWeb(true), service.WithGRPCWebPrefix("/grpc"), service.WithMiddlewares(httpLogger), service.WithInterceptors(metrics, defaulter, validation), ) svc, err = service.New(opts...) if err != nil { panic(err) } RegisterGreeterServer(svc, &GreeterHandler{}) metrics2.Register(svc) go func() { if err := svc.Start(); err != nil { panic(err) } }() go func() { http.Handle("/metrics", promhttp.Handler()) if err := http.ListenAndServe(":9992", nil); err != nil { panic(err) } }() <-ready s, err := client.New( // client.WithName(name), // client.WithVersion(version), client.WithAddress("localhost:9991"), // client.WithRegistry(mdns.NewRegistry()), client.WithSecure(secure), client.WithUnaryInterceptors(func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error { logger.From(ctx).WithFields("party", "client", "method", method).Info(req) return invoker(ctx, method, req, reply, cc, opts...) }), ) if err != nil { log.Fatal(err) } g := NewGreeterClient(s) defer cancel() md := metadata.MD{} res, err := g.SayHello(ctx, &HelloRequest{Name: "test"}, grpc.Header(&md)) if err != nil { log.Fatal(err) } logMetadata(ctx, md) log.Infof("received message: %s", res.Message) md = metadata.MD{} res, err = g.SayHello(ctx, &HelloRequest{}, grpc.Header(&md)) if err == nil { log.Fatal("expected validation error") } logMetadata(ctx, md) stream, err := g.SayHelloStream(ctx, &HelloStreamRequest{Name: "test"}, grpc.Header(&md)) if err != nil { log.Fatal(err) } if md, err := stream.Header(); err == nil { logMetadata(ctx, md) } for { m, err := stream.Recv() if errors.Is(err, io.EOF) { break } if err != nil { log.Fatal(err) } log.Infof("received stream message: %s", m.Message) } scheme := "http://" if secure { scheme = "https://" } httpc := &http.Client{ Transport: &http.Transport{ TLSClientConfig: &tls.Config{ InsecureSkipVerify: true, }, }, } req := `{"name":"test"}` do := func(url, contentType string) { resp, err := httpc.Post(url, contentType, strings.NewReader(req)) if err != nil { log.Fatal(err) } defer resp.Body.Close() b, err := ioutil.ReadAll(resp.Body) if err != nil { log.Fatal(err) } log.Info(string(b)) } do(scheme+address+"/rest/api/v1/greeter/hello", "application/json") do(scheme+address+"/grpc/helloworld.Greeter/SayHello", "application/grpc-web+json") if err := readSvcs(ctx, s); err != nil { log.Fatal(err) } cancel() <-done } func logMetadata(ctx context.Context, md metadata.MD) { log := logger.From(ctx) for k, v := range md { log.Infof("%s: %v", k, v) } } func readSvcs(ctx context.Context, c client.Client) (err error) { log := logger.From(ctx) rc := greflectsvc.NewServerReflectionClient(c) rstream, err := rc.ServerReflectionInfo(ctx) if err != nil { return err } defer func() { if err2 := rstream.CloseSend(); err2 != nil && err == nil { err = err2 } }() if err = rstream.Send(&greflectsvc.ServerReflectionRequest{MessageRequest: &greflectsvc.ServerReflectionRequest_ListServices{}}); err != nil { return err } var rres *greflectsvc.ServerReflectionResponse rres, err = rstream.Recv() if err != nil { return err } rlist, ok := rres.MessageResponse.(*greflectsvc.ServerReflectionResponse_ListServicesResponse) if !ok { return fmt.Errorf("unexpected reflection response type: %T", rres.MessageResponse) } for _, v := range rlist.ListServicesResponse.Service { if v.Name == "grpc.reflection.v1alpha.ServerReflection" { continue } parts := strings.Split(v.Name, ".") if len(parts) < 2 { return fmt.Errorf("malformed service name: %s", v.Name) } pkg := strings.Join(parts[:len(parts)-1], ".") svc := parts[len(parts)-1] if err = rstream.Send(&greflectsvc.ServerReflectionRequest{MessageRequest: &greflectsvc.ServerReflectionRequest_FileContainingSymbol{ FileContainingSymbol: v.Name, }}); err != nil { return err } rres, err = rstream.Recv() if err != nil { log.Fatal(err) } rfile, ok := rres.MessageResponse.(*greflectsvc.ServerReflectionResponse_FileDescriptorResponse) if !ok { return fmt.Errorf("unexpected reflection response type: %T", rres.MessageResponse) } fdps := make(map[string]*descriptorpb.DescriptorProto) var sdp *descriptorpb.ServiceDescriptorProto for _, v := range rfile.FileDescriptorResponse.FileDescriptorProto { fdp := &descriptorpb.FileDescriptorProto{} if err = proto.Unmarshal(v, fdp); err != nil { return err } for _, s := range fdp.GetService() { if fdp.GetPackage() == pkg && s.GetName() == svc { if sdp != nil { log.Warnf("service already found: %s.%s", fdp.GetPackage(), s.GetName()) continue } sdp = s } } for _, m := range fdp.GetMessageType() { fdps[fdp.GetPackage()+"."+m.GetName()] = m } } if sdp == nil { return fmt.Errorf("%s: service not found", v.Name) } for _, m := range sdp.GetMethod() { log.Infof("%s: %s", v.Name, m.GetName()) } } return nil }