go_package option as go import path

.gitignore

@@ -0,0 +1 @@
+_output/

Makefile

@@ -39,6 +39,7 @@ GATEWAY_PLUGIN_SRC= utilities/doc.go \
 GOOGLEAPIS_DIR=third_party/googleapis
 OPTIONS_PROTO=$(GOOGLEAPIS_DIR)/google/api/annotations.proto $(GOOGLEAPIS_DIR)/google/api/http.proto
 OPTIONS_GO=$(OPTIONS_PROTO:.proto=.pb.go)
+OUTPUT_DIR=_output
 
 PKGMAP=Mgoogle/protobuf/descriptor.proto=$(GO_PLUGIN_PKG)/descriptor,Mgoogle/api/annotations.proto=$(PKG)/$(GOOGLEAPIS_DIR)/google/api,Mexamples/sub/message.proto=$(PKG)/examples/sub
 SWAGGER_EXAMPLES=examples/examplepb/echo_service.proto \
@@ -49,7 +50,7 @@ EXAMPLES=examples/examplepb/echo_service.proto \
 EXAMPLE_SVCSRCS=$(EXAMPLES:.proto=.pb.go)
 EXAMPLE_GWSRCS=$(EXAMPLES:.proto=.pb.gw.go)
 EXAMPLE_SWAGGERSRCS=$(EXAMPLES:.proto=.swagger.json)
-EXAMPLE_DEPS=examples/sub/message.proto
+EXAMPLE_DEPS=examples/sub/message.proto examples/sub2/message.proto
 EXAMPLE_DEPSRCS=$(EXAMPLE_DEPS:.proto=.pb.go)
 PROTOC_INC_PATH=$(dir $(shell which protoc))/../include
 
@@ -73,7 +74,9 @@ $(SWAGGER_PLUGIN): $(OPTIONS_GO) $(SWAGGER_PLUGIN_SRC)
 $(EXAMPLE_SVCSRCS): $(GO_PLUGIN) $(EXAMPLES)
 	protoc -I $(PROTOC_INC_PATH) -I. -I$(GOOGLEAPIS_DIR) --plugin=$(GO_PLUGIN) --go_out=$(PKGMAP),plugins=grpc:. $(EXAMPLES)
 $(EXAMPLE_DEPSRCS): $(GO_PLUGIN) $(EXAMPLE_DEPS)
-	protoc -I $(PROTOC_INC_PATH) -I. --plugin=$(GO_PLUGIN) --go_out=$(PKGMAP),plugins=grpc:. $(EXAMPLE_DEPS)
+	mkdir -p $(OUTPUT_DIR)
+	protoc -I $(PROTOC_INC_PATH) -I. --plugin=$(GO_PLUGIN) --go_out=$(PKGMAP),plugins=grpc:$(OUTPUT_DIR) $(@:.pb.go=.proto)
+	cp $(OUTPUT_DIR)/$(PKG)/$@ $@ || cp $(OUTPUT_DIR)/$@ $@
 $(EXAMPLE_GWSRCS): $(GATEWAY_PLUGIN) $(EXAMPLES)
 	protoc -I $(PROTOC_INC_PATH) -I. -I$(GOOGLEAPIS_DIR) --plugin=$(GATEWAY_PLUGIN) --grpc-gateway_out=logtostderr=true,$(PKGMAP):. $(EXAMPLES)
 $(EXAMPLE_SWAGGERSRCS): $(SWAGGER_PLUGIN) $(SWAGGER_EXAMPLES)

examples/examplepb/a_bit_of_everything.proto

@@ -4,6 +4,7 @@ package gengo.grpc.gateway.examples.examplepb;
 
 import "google/api/annotations.proto";
 import "examples/sub/message.proto";
+import "examples/sub2/message.proto";
 
 message ABitOfEverything {
 	message Nested {
@@ -40,10 +41,6 @@ message ABitOfEverything {
 message EmptyMessage {
 }
 
-message IdMessage {
-	string uuid = 1;
-}
-
 enum NumericEnum {
 	ZERO = 0;
 	ONE = 1;
@@ -68,7 +65,7 @@ service ABitOfEverythingService {
 			body: "*"
 		};
 	}
-	rpc Lookup(IdMessage) returns (ABitOfEverything) {
+	rpc Lookup(sub2.IdMessage) returns (ABitOfEverything) {
 		option (google.api.http) = {
 			get: "/v1/example/a_bit_of_everything/{uuid}"
 		};
@@ -84,7 +81,7 @@ service ABitOfEverythingService {
 			body: "*"
 		};
 	}
-	rpc Delete(IdMessage) returns (EmptyMessage) {
+	rpc Delete(sub2.IdMessage) returns (EmptyMessage) {
 		option (google.api.http) = {
 			delete: "/v1/example/a_bit_of_everything/{uuid}"
 		};

examples/server/a_bit_of_everything.go

@@ -7,6 +7,7 @@ import (
 
 	examples "github.com/gengo/grpc-gateway/examples/examplepb"
 	sub "github.com/gengo/grpc-gateway/examples/sub"
+	sub2 "github.com/gengo/grpc-gateway/examples/sub2"
 	"github.com/golang/glog"
 	"github.com/rogpeppe/fastuuid"
 	"golang.org/x/net/context"
@@ -84,7 +85,7 @@ func (s *_ABitOfEverythingServer) BulkCreate(stream examples.ABitOfEverythingSer
 	return stream.SendAndClose(new(examples.EmptyMessage))
 }
 
-func (s *_ABitOfEverythingServer) Lookup(ctx context.Context, msg *examples.IdMessage) (*examples.ABitOfEverything, error) {
+func (s *_ABitOfEverythingServer) Lookup(ctx context.Context, msg *sub2.IdMessage) (*examples.ABitOfEverything, error) {
 	s.m.Lock()
 	defer s.m.Unlock()
 	glog.Info(msg)
@@ -150,7 +151,7 @@ func (s *_ABitOfEverythingServer) Update(ctx context.Context, msg *examples.ABit
 	return new(examples.EmptyMessage), nil
 }
 
-func (s *_ABitOfEverythingServer) Delete(ctx context.Context, msg *examples.IdMessage) (*examples.EmptyMessage, error) {
+func (s *_ABitOfEverythingServer) Delete(ctx context.Context, msg *sub2.IdMessage) (*examples.EmptyMessage, error) {
 	s.m.Lock()
 	defer s.m.Unlock()
 

examples/sub2/message.proto

@@ -0,0 +1,7 @@
+syntax = "proto3";
+option go_package = "github.com/gengo/grpc-gateway/examples/sub2";
+package sub2;
+
+message IdMessage {
+	string uuid = 1;
+}

protoc-gen-grpc-gateway/descriptor/registry.go

@@ -223,13 +223,20 @@ func (r *Registry) ReserveGoPackageAlias(alias, pkgpath string) error {
 }
 
 // goPackagePath returns the go package path which go files generated from "f" should have.
-// It respects the mapping registered by AddPkgMap if exists. Or it generates a path from
-// the file name of "f" if otherwise.
+// It respects the mapping registered by AddPkgMap if exists. Or use go_package as import path
+// if it includes a slash,  Otherwide, it generates a path from the file name of "f".
 func (r *Registry) goPackagePath(f *descriptor.FileDescriptorProto) string {
 	name := f.GetName()
 	if pkg, ok := r.pkgMap[name]; ok {
 		return path.Join(r.prefix, pkg)
 	}
+
+	gopkg := f.Options.GetGoPackage()
+	idx := strings.LastIndex(gopkg, "/")
+	if idx >= 0 {
+		return gopkg
+	}
+
 	return path.Join(r.prefix, path.Dir(name))
 }
 
@@ -263,7 +270,13 @@ func defaultGoPackageName(f *descriptor.FileDescriptorProto) string {
 // as protoc-gen-go does.
 func packageIdentityName(f *descriptor.FileDescriptorProto) string {
 	if f.Options != nil && f.Options.GoPackage != nil {
-		return f.Options.GetGoPackage()
+		gopkg := f.Options.GetGoPackage()
+		idx := strings.LastIndex(gopkg, "/")
+		if idx < 0 {
+			return gopkg
+		}
+
+		return gopkg[idx+1:]
 	}
 
 	if f.Package == nil {