How to use OnSendHeaders method of grpc Package

Best Venom code snippet using grpc.OnSendHeaders

invoke.go

Source:invoke.go Github

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...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...

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handler.go

Source:handler.go Github

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...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}...

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eventhandler.go

Source:eventhandler.go Github

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...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}...

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OnSendHeaders

Using AI Code Generation

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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

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OnSendHeaders

Using AI Code Generation

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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(

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OnSendHeaders

Using AI Code Generation

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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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