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How to use OnSendHeaders method of grpc Package

Best Venom code snippet using grpc.OnSendHeaders

invoke.go

Source:invoke.go

...20// generally called in the order they are listed below.21type InvocationEventHandler interface {22	// OnResolveMethod is called with a descriptor of the method that is being invoked.23	OnResolveMethod(*desc.MethodDescriptor)24	// OnSendHeaders is called with the request metadata that is being sent.25	OnSendHeaders(metadata.MD)26	// OnReceiveHeaders is called when response headers have been received.27	OnReceiveHeaders(metadata.MD)28	// OnReceiveResponse is called for each response message received.29	OnReceiveResponse(proto.Message) (string, error)30	// OnReceiveTrailers is called when response trailers and final RPC status have been received.31	OnReceiveTrailers(*status.Status, metadata.MD)32}33// RequestSupplier is a function that is called to populate messages for a gRPC operation. The34// function should populate the given message or return a non-nil error. If the supplier has no35// more messages, it should return io.EOF. When it returns io.EOF, it should not in any way36// modify the given message argument.37type RequestSupplier func(proto.Message) error38// InvokeRPC uses the given gRPC channel to invoke the given method. The given descriptor source39// is used to determine the type of method and the type of request and response message. The given40// headers are sent as request metadata. Methods on the given event handler are called as the41// invocation proceeds.42//43// The given requestData function supplies the actual data to send. It should return io.EOF when44// there is no more request data. If the method being invoked is a unary or server-streaming RPC45// (e.g. exactly one request message) and there is no request data (e.g. the first invocation of46// the function returns io.EOF), then an empty request message is sent.47//48// If the requestData function and the given event handler coordinate or share any state, they should49// be thread-safe. This is because the requestData function may be called from a different goroutine50// than the one invoking event callbacks. (This only happens for bi-directional streaming RPCs, where51// one goroutine sends request messages and another consumes the response messages).52func InvokeRPC(ctx context.Context, source DescriptorSource, ch grpcdynamic.Channel, methodName string,53	headers []string, handler InvocationEventHandler, requestData RequestSupplier) (string, error) {54	md := MetadataFromHeaders(headers)55	svc, mth := parseSymbol(methodName)56	if svc == "" || mth == "" {57		return "", fmt.Errorf("given method name %q is not in expected format: 'service/method' or 'service.method'", methodName)58	}59	dsc, err := source.FindSymbol(svc)60	if err != nil {61		if isNotFoundError(err) {62			return "", fmt.Errorf("target server does not expose service %q", svc)63		}64		return "", fmt.Errorf("failed to query for service descriptor %q: %v", svc, err)65	}66	sd, ok := dsc.(*desc.ServiceDescriptor)67	if !ok {68		return "", fmt.Errorf("target server does not expose service %q", svc)69	}70	mtd := sd.FindMethodByName(mth)71	if mtd == nil {72		return "", fmt.Errorf("service %q does not include a method named %q", svc, mth)73	}74	//handler.OnResolveMethod(mtd)75	// we also download any applicable extensions so we can provide full support for parsing user-provided data76	var ext dynamic.ExtensionRegistry77	alreadyFetched := map[string]bool{}78	if err = fetchAllExtensions(source, &ext, mtd.GetInputType(), alreadyFetched); err != nil {79		return "", fmt.Errorf("error resolving server extensions for message %s: %v", mtd.GetInputType().GetFullyQualifiedName(), err)80	}81	if err = fetchAllExtensions(source, &ext, mtd.GetOutputType(), alreadyFetched); err != nil {82		return "", fmt.Errorf("error resolving server extensions for message %s: %v", mtd.GetOutputType().GetFullyQualifiedName(), err)83	}84	msgFactory := dynamic.NewMessageFactoryWithExtensionRegistry(&ext)85	req := msgFactory.NewMessage(mtd.GetInputType())86	//handler.OnSendHeaders(md)87	ctx = metadata.NewOutgoingContext(ctx, md)88	stub := grpcdynamic.NewStubWithMessageFactory(ch, msgFactory)89	ctx, cancel := context.WithCancel(ctx)90	defer cancel()91	return invokeUnary(ctx, stub, mtd, handler, requestData, protov1.MessageV2(req))92}93func invokeUnary(ctx context.Context, stub grpcdynamic.Stub, md *desc.MethodDescriptor, handler InvocationEventHandler,94	requestData RequestSupplier, req proto.Message) (string, error) {95	err := requestData(req)96	if err != nil && err != io.EOF {97		return "", fmt.Errorf("error getting request data: %v", err)98	}99	if err != io.EOF {100		// verify there is no second message, which is a usage error...

handler.go

Source:handler.go

...73}74// OnResolveMethod is called with a descriptor of the method that is being invoked.75func (h *grpcHandler) OnResolveMethod(*desc.MethodDescriptor) {76}77// OnSendHeaders is called with the request metadata that is being sent.78func (h *grpcHandler) OnSendHeaders(metadata.MD) {79}80// OnReceiveHeaders is called when response headers have been received.81func (h *grpcHandler) OnReceiveHeaders(md metadata.MD) {82}83func (h *grpcHandler) OnReceiveResponse(resp proto.Message) {84	h.ml.Lock()85	defer h.ml.Unlock()86	h.msgs = append(h.msgs, resp)87}88func (h *grpcHandler) OnReceiveTrailers(s *status.Status, meta metadata.MD) {89	h.code = s.Code()90	h.msg = s.Message()91	h.details = s.Details()92}...

eventhandler.go

Source:eventhandler.go

...23	}24}25func (h *EventHandler) OnResolveMethod(_ *desc.MethodDescriptor) {26}27func (h *EventHandler) OnSendHeaders(_ metadata.MD) {28}29func (h *EventHandler) OnReceiveHeaders(_ metadata.MD) {30}31func (h *EventHandler) OnReceiveResponse(message proto.Message) {32	if err := h.marshaler.Marshal(h.writer, message); err != nil {33		logx.Error(err)34	}35}36func (h *EventHandler) OnReceiveTrailers(status *status.Status, _ metadata.MD) {37	h.Status = status38}...

OnSendHeaders

Using AI Code Generation

1import (2func main() {3	conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure())4	if err != nil {5		log.Fatalf("did not connect: %v", err)6	}7	defer conn.Close()8	c := NewGreeterClient(conn)9	ctx, cancel := context.WithTimeout(context.Background(), time.Second)10	defer cancel()11	ctx = metadata.AppendToOutgoingContext(ctx, "mykey", "myvalue")12	r, err := c.SayHello(ctx, &HelloRequest{Name: name})13	if err != nil {14		log.Fatalf("could not greet: %v", err)15	}16	fmt.Println("Greeting: ", r.Message)17}18import (19func main() {20	conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure())21	if err != nil {22		log.Fatalf("did not connect: %v", err)23	}24	defer conn.Close()25	c := NewGreeterClient(conn)26	ctx, cancel := context.WithTimeout(context.Background(), time.Second)27	defer cancel()28	ctx = metadata.AppendToOutgoingContext(ctx, "mykey", "myvalue")29	r, err := c.SayHello(ctx, &HelloRequest{Name: name})30	if err != nil {31		log.Fatalf("could not greet: %v", err)32	}33	fmt.Println("Greeting: ", r.Message)34}35import (36func main() {37	conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure

OnSendHeaders

Using AI Code Generation

1func main() {2    opts = append(opts, grpc.WithInsecure())3    opts = append(opts, grpc.WithUnaryInterceptor(4        grpc_middleware.ChainUnaryClient(5            grpc_opentracing.UnaryClientInterceptor(),6    conn, err := grpc.Dial("localhost:8080", opts...)7    if err != nil {8        log.Fatalf("did not connect: %v", err)9    }10    defer conn.Close()11    c := pb.NewGreeterClient(conn)12    if len(os.Args) > 1 {13    }14    ctx, cancel := context.WithTimeout(context.Background(), time.Second)15    defer cancel()16    r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name})17    if err != nil {18        log.Fatalf("could not greet: %v", err)19    }20    log.Printf("Greeting: %s", r.Message)21}22func main() {23    opts = append(opts, grpc.WithInsecure())24    opts = append(opts, grpc.WithUnaryInterceptor(25        grpc_middleware.ChainUnaryClient(26            grpc_opentracing.UnaryClientInterceptor(),27    conn, err := grpc.Dial("localhost:8080", opts...)28    if err != nil {29        log.Fatalf("did not connect: %v", err)30    }31    defer conn.Close()32    c := pb.NewGreeterClient(conn)33    if len(os.Args) > 1 {34    }35    ctx, cancel := context.WithTimeout(context.Background(), time.Second)36    defer cancel()37    r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name})38    if err != nil {39        log.Fatalf("could not greet: %v", err)40    }41    log.Printf("Greeting: %s", r.Message)42}43func main() {44    opts = append(opts, grpc.WithInsecure())45    opts = append(opts, grpc.WithUnaryInterceptor(46        grpc_middleware.ChainUnaryClient(

OnSendHeaders

Using AI Code Generation

1import (2func main() {3	conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure())4	if err != nil {5		log.Fatalf("did not connect: %v", err)6	}7	defer conn.Close()8	c := pb.NewGreeterClient(conn)9	ctx, cancel := context.WithTimeout(context.Background(), time.Second)10	defer cancel()11	ctx = metadata.AppendToOutgoingContext(ctx, "key", "value")12	r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name})13	if err != nil {14		log.Fatalf("could not greet: %v", err)15	}16	log.Printf("Greeting: %s", r.Message)17}18import (19func main() {20	conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure())21	if err != nil {22		log.Fatalf("did not connect: %v", err)23	}24	defer conn.Close()25	c := pb.NewGreeterClient(conn)26	ctx, cancel := context.WithTimeout(context.Background(), time.Second)27	defer cancel()28	ctx = metadata.AppendToOutgoingContext(ctx, "key", "value")29	r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name})30	if err != nil {31		log.Fatalf("could not greet: %v", err)32	}33	log.Printf("Greeting: %s", r.Message)34}35import (36func main() {

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