grpc-gateway service run error

[lowmanisbusy]

🐛 Bug Report

I make helloworld.pb.gw.go and write reverse-proxy server successful, but when I execute go run，it can't start and raising exceptions like that:

../helloworld/helloworld.pb.gw.go:34:90: undefined: GreeterClient
../helloworld/helloworld.pb.gw.go:35:15: undefined: HelloRequest
../helloworld/helloworld.pb.gw.go:51:96: undefined: GreeterServer
../helloworld/helloworld.pb.gw.go:52:15: undefined: HelloRequest
../helloworld/helloworld.pb.gw.go:72:86: undefined: GreeterServer
../helloworld/helloworld.pb.gw.go:128:48: undefined: NewGreeterClient
../helloworld/helloworld.pb.gw.go:136:86: undefined: GreeterClient

my helloworld.pb.gw.go code is:

`// Code generated by protoc-gen-grpc-gateway. DO NOT EDIT.
// source: helloworld.proto

/*
Package helloworld is a reverse proxy.

It translates gRPC into RESTful JSON APIs.
*/
package helloworld

import (
	"context"
	"io"
	"net/http"

	"github.com/grpc-ecosystem/grpc-gateway/runtime"
	"github.com/grpc-ecosystem/grpc-gateway/utilities"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/grpclog"
	"google.golang.org/grpc/metadata"
	"google.golang.org/grpc/status"
	"google.golang.org/protobuf/proto"
)

// Suppress "imported and not used" errors
var _ codes.Code
var _ io.Reader
var _ status.Status
var _ = runtime.String
var _ = utilities.NewDoubleArray
var _ = metadata.Join

func request_Greeter_SayHello_0(ctx context.Context, marshaler runtime.Marshaler, client GreeterClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
	var protoReq HelloRequest
	var metadata runtime.ServerMetadata

	newReader, berr := utilities.IOReaderFactory(req.Body)
	if berr != nil {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
	}
	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
	}

	msg, err := client.SayHello(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
	return msg, metadata, err

}

func local_request_Greeter_SayHello_0(ctx context.Context, marshaler runtime.Marshaler, server GreeterServer, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
	var protoReq HelloRequest
	var metadata runtime.ServerMetadata

	newReader, berr := utilities.IOReaderFactory(req.Body)
	if berr != nil {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", berr)
	}
	if err := marshaler.NewDecoder(newReader()).Decode(&protoReq); err != nil && err != io.EOF {
		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
	}

	msg, err := server.SayHello(ctx, &protoReq)
	return msg, metadata, err

}

// RegisterGreeterHandlerServer registers the http handlers for service Greeter to "mux".
// UnaryRPC     :call GreeterServer directly.
// StreamingRPC :currently unsupported pending https://github.com/grpc/grpc-go/issues/906.
// Note that using this registration option will cause many gRPC library features to stop working. Consider using RegisterGreeterHandlerFromEndpoint instead.
func RegisterGreeterHandlerServer(ctx context.Context, mux *runtime.ServeMux, server GreeterServer) error {

	mux.Handle("POST", pattern_Greeter_SayHello_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
		ctx, cancel := context.WithCancel(req.Context())
		defer cancel()
		var stream runtime.ServerTransportStream
		ctx = grpc.NewContextWithServerTransportStream(ctx, &stream)
		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
		rctx, err := runtime.AnnotateIncomingContext(ctx, mux, req, "/helloworld.Greeter/SayHello")
		if err != nil {
			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
			return
		}
		resp, md, err := local_request_Greeter_SayHello_0(rctx, inboundMarshaler, server, req, pathParams)
		md.HeaderMD, md.TrailerMD = metadata.Join(md.HeaderMD, stream.Header()), metadata.Join(md.TrailerMD, stream.Trailer())
		ctx = runtime.NewServerMetadataContext(ctx, md)
		if err != nil {
			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
			return
		}

		forward_Greeter_SayHello_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)

	})

	return nil
}

// RegisterGreeterHandlerFromEndpoint is same as RegisterGreeterHandler but
// automatically dials to "endpoint" and closes the connection when "ctx" gets done.
func RegisterGreeterHandlerFromEndpoint(ctx context.Context, mux *runtime.ServeMux, endpoint string, opts []grpc.DialOption) (err error) {
	conn, err := grpc.Dial(endpoint, opts...)
	if err != nil {
		return err
	}
	defer func() {
		if err != nil {
			if cerr := conn.Close(); cerr != nil {
				grpclog.Infof("Failed to close conn to %s: %v", endpoint, cerr)
			}
			return
		}
		go func() {
			<-ctx.Done()
			if cerr := conn.Close(); cerr != nil {
				grpclog.Infof("Failed to close conn to %s: %v", endpoint, cerr)
			}
		}()
	}()

	return RegisterGreeterHandler(ctx, mux, conn)
}

// RegisterGreeterHandler registers the http handlers for service Greeter to "mux".
// The handlers forward requests to the grpc endpoint over "conn".
func RegisterGreeterHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc.ClientConn) error {
	return RegisterGreeterHandlerClient(ctx, mux, NewGreeterClient(conn))
}

// RegisterGreeterHandlerClient registers the http handlers for service Greeter
// to "mux". The handlers forward requests to the grpc endpoint over the given implementation of "GreeterClient".
// Note: the gRPC framework executes interceptors within the gRPC handler. If the passed in "GreeterClient"
// doesn't go through the normal gRPC flow (creating a gRPC client etc.) then it will be up to the passed in
// "GreeterClient" to call the correct interceptors.
func RegisterGreeterHandlerClient(ctx context.Context, mux *runtime.ServeMux, client GreeterClient) error {

	mux.Handle("POST", pattern_Greeter_SayHello_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
		ctx, cancel := context.WithCancel(req.Context())
		defer cancel()
		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
		rctx, err := runtime.AnnotateContext(ctx, mux, req, "/helloworld.Greeter/SayHello")
		if err != nil {
			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
			return
		}
		resp, md, err := request_Greeter_SayHello_0(rctx, inboundMarshaler, client, req, pathParams)
		ctx = runtime.NewServerMetadataContext(ctx, md)
		if err != nil {
			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
			return
		}

		forward_Greeter_SayHello_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)

	})

	return nil
}

var (
	pattern_Greeter_SayHello_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1}, []string{"v1", "hello"}, ""))
)

var (
	forward_Greeter_SayHello_0 = runtime.ForwardResponseMessage
)

I don't know why, did I do something wrong?

[johanbrandhorst]

Looks like you need to run the protoc-gen-go generator too? It needs to be run and output into the same folder.

[lowmanisbusy]

Looks like you need to run the protoc-gen-go generator too? It needs to be run and output into the same folder.

You are right，I lost something like that： go_out , protoc-gen-go-grpc, protoc-gen-go and go-grpc_out,
Thank you!