Add parser and swagger support for enum, no gengateway yet

examples/examplepb/a_bit_of_everything.proto

@@ -9,6 +9,11 @@ message ABitOfEverything {
 	message Nested {
 		string name = 1;
 		uint32 amount = 2;
+		enum DeepEnum {
+			FALSE = 0;
+			TRUE = 1;
+		}
+		DeepEnum ok = 3;
 	}
 
 	string uuid = 1;
@@ -24,11 +29,12 @@ message ABitOfEverything {
 	string string_value = 11;
 	// TODO(yugui) add bytes_value
 	uint32 uint32_value = 13;
-	// TODO(yugui) add enum_value
+	NumericEnum enum_value = 14;
 	sfixed32 sfixed32_value = 15;
 	sfixed64 sfixed64_value = 16;
 	sint32 sint32_value = 17;
 	sint64 sint64_value = 18;
+	repeated string repeated_string_value = 19;
 }
 
 message EmptyMessage {
@@ -38,8 +44,14 @@ message IdMessage {
 	string uuid = 1;
 }
 
+enum NumericEnum {
+	ZERO = 0;
+	ONE = 1;
+}
+
 service ABitOfEverythingService {
 	rpc Create(ABitOfEverything) returns (ABitOfEverything) {
+		// TODO add enum_value
 		option (google.api.http) = {
 			post: "/v1/example/a_bit_of_everything/{float_value}/{double_value}/{int64_value}/separator/{uint64_value}/{int32_value}/{fixed64_value}/{fixed32_value}/{bool_value}/{string_value=strprefix/*}/{uint32_value}/{sfixed32_value}/{sfixed64_value}/{sint32_value}/{sint64_value}"
 		};

examples/examplepb/streamless_everything.proto

@@ -9,6 +9,11 @@ message ABitOfEverything {
 	message Nested {
 		string name = 1;
 		uint32 amount = 2;
+		enum DeepEnum {
+			FALSE = 0;
+			TRUE = 1;
+		}
+		DeepEnum ok = 3;
 	}
 
 	string uuid = 1;
@@ -24,12 +29,12 @@ message ABitOfEverything {
 	string string_value = 11;
 	// TODO(yugui) add bytes_value
 	uint32 uint32_value = 13;
-	// TODO(yugui) add enum_value
+	NumericEnum enum_value = 14;
 	sfixed32 sfixed32_value = 15;
 	sfixed64 sfixed64_value = 16;
 	sint32 sint32_value = 17;
 	sint64 sint64_value = 18;
-  repeated string repeated_string_value = 19;
+	repeated string repeated_string_value = 19;
 }
 
 message EmptyMessage {
@@ -39,8 +44,14 @@ message IdMessage {
 	string uuid = 1;
 }
 
+enum NumericEnum {
+	ZERO = 0;
+	ONE  = 1;
+}
+
 service ABitOfEverythingService {
 	rpc Create(ABitOfEverything) returns (ABitOfEverything) {
+		// TODO add enum_value
 		option (google.api.http) = {
 			post: "/v1/example/a_bit_of_everything/{float_value}/{double_value}/{int64_value}/separator/{uint64_value}/{int32_value}/{fixed64_value}/{fixed32_value}/{bool_value}/{string_value=strprefix/*}/{uint32_value}/{sfixed32_value}/{sfixed64_value}/{sint32_value}/{sint64_value}"
 		};

examples/examplepb/streamless_everything.swagger.json

@@ -266,9 +266,20 @@
         "name": {
           "type": "string",
           "format": "string"
+        },
+        "ok": {
+          "$ref": "#/definitions/NestedDeepEnum"
         }
       }
     },
+    "NestedDeepEnum": {
+      "type": "string",
+      "enum": [
+        "FALSE",
+        "TRUE"
+      ],
+      "default": "FALSE"
+    },
     "examplepbABitOfEverything": {
       "properties": {
         "bool_value": {
@@ -279,6 +290,9 @@
           "type": "number",
           "format": "double"
         },
+        "enum_value": {
+          "$ref": "#/definitions/examplepbNumericEnum"
+        },
         "fixed32_value": {
           "type": "integer",
           "format": "int32"
@@ -355,6 +369,14 @@
         }
       }
     },
+    "examplepbNumericEnum": {
+      "type": "string",
+      "enum": [
+        "ZERO",
+        "ONE"
+      ],
+      "default": "ZERO"
+    },
     "subStringMessage": {
       "properties": {
         "value": {

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

@@ -16,6 +16,9 @@ type Registry struct {
 	// msgs is a mapping from fully-qualified message name to descriptor
 	msgs map[string]*Message
 
+	// enums is a mapping from fully-qualified enum name to descriptor
+	enums map[string]*Enum
+
 	// files is a mapping from file path to descriptor
 	files map[string]*File
 
@@ -33,13 +36,14 @@ type Registry struct {
 func NewRegistry() *Registry {
 	return &Registry{
 		msgs:       make(map[string]*Message),
+		enums:      make(map[string]*Enum),
 		files:      make(map[string]*File),
 		pkgMap:     make(map[string]string),
 		pkgAliases: make(map[string]string),
 	}
 }
 
-// Load loads definitions of services, methods, messages and fields from "req".
+// Load loads definitions of services, methods, messages, enumerations and fields from "req".
 func (r *Registry) Load(req *plugin.CodeGeneratorRequest) error {
 	for _, file := range req.GetProtoFile() {
 		r.loadFile(file)
@@ -67,7 +71,7 @@ func (r *Registry) Load(req *plugin.CodeGeneratorRequest) error {
 	return nil
 }
 
-// loadFile loads messages and fiels from "file".
+// loadFile loads messages, enumerations and fields from "file".
 // It does not loads services and methods in "file".  You need to call
 // loadServices after loadFiles is called for all files to load services and methods.
 func (r *Registry) loadFile(file *descriptor.FileDescriptorProto) {
@@ -91,6 +95,7 @@ func (r *Registry) loadFile(file *descriptor.FileDescriptorProto) {
 
 	r.files[file.GetName()] = f
 	r.registerMsg(f, nil, file.GetMessageType())
+	r.registerEnum(f, nil, file.GetEnumType())
 }
 
 func (r *Registry) registerMsg(file *File, outerPath []string, msgs []*descriptor.DescriptorProto) {
@@ -114,6 +119,20 @@ func (r *Registry) registerMsg(file *File, outerPath []string, msgs []*descripto
 		outers = append(outers, outerPath...)
 		outers = append(outers, m.GetName())
 		r.registerMsg(file, outers, m.GetNestedType())
+		r.registerEnum(file, outers, m.GetEnumType())
+	}
+}
+
+func (r *Registry) registerEnum(file *File, outerPath []string, enums []*descriptor.EnumDescriptorProto) {
+	for _, ed := range enums {
+		e := &Enum{
+			File:                file,
+			Outers:              outerPath,
+			EnumDescriptorProto: ed,
+		}
+		file.Enums = append(file.Enums, e)
+		r.enums[e.FQEN()] = e
+		glog.V(1).Infof("register enum name: %s", e.FQEN())
 	}
 }
 
@@ -143,6 +162,32 @@ func (r *Registry) LookupMsg(location, name string) (*Message, error) {
 	return nil, fmt.Errorf("no message found: %s", name)
 }
 
+// LookupEnum looks up a enum type by "name".
+// It tries to resolve "name" from "location" if "name" is a relative enum name.
+func (r *Registry) LookupEnum(location, name string) (*Enum, error) {
+	glog.V(1).Infof("lookup enum %s from %s", name, location)
+	if strings.HasPrefix(name, ".") {
+		e, ok := r.enums[name]
+		if !ok {
+			return nil, fmt.Errorf("no enum found: %s", name)
+		}
+		return e, nil
+	}
+
+	if !strings.HasPrefix(location, ".") {
+		location = fmt.Sprintf(".%s", location)
+	}
+	components := strings.Split(location, ".")
+	for len(components) > 0 {
+		fqen := strings.Join(append(components, name), ".")
+		if e, ok := r.enums[fqen]; ok {
+			return e, nil
+		}
+		components = components[:len(components)-1]
+	}
+	return nil, fmt.Errorf("no enum found: %s", name)
+}
+
 // LookupFile looks up a file by name.
 func (r *Registry) LookupFile(name string) (*File, error) {
 	f, ok := r.files[name]
@@ -197,6 +242,15 @@ func (r *Registry) GetAllFQMNs() []string {
 	return keys
 }
 
+// GetAllFQENs returns a list of all FQENs
+func (r *Registry) GetAllFQENs() []string {
+	var keys []string
+	for k := range r.enums {
+		keys = append(keys, k)
+	}
+	return keys
+}
+
 // defaultGoPackageName returns the default go package name to be used for go files generated from "f".
 // You might need to use an unique alias for the package when you import it.  Use ReserveGoPackageAlias to get a unique alias.
 func defaultGoPackageName(f *descriptor.FileDescriptorProto) string {

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

@@ -39,6 +39,8 @@ type File struct {
 	GoPkg GoPackage
 	// Messages is the list of messages defined in this file.
 	Messages []*Message
+	// Enums is the list of enums defined in this file.
+	Enums []*Enum
 	// Services is the list of services defined in this file.
 	Services []*Service
 }
@@ -88,6 +90,26 @@ func (m *Message) GoType(currentPackage string) string {
 	return fmt.Sprintf("%s.%s", pkg, name)
 }
 
+// Enum describes a protocol buffer enum types
+type Enum struct {
+	// File is the file where the enum is defined
+	File *File
+	// Outers is a list of outer messages if this enum is a nested type.
+	Outers []string
+	*descriptor.EnumDescriptorProto
+}
+
+// FQEN returns a fully qualified enum name of this enum.
+func (e *Enum) FQEN() string {
+	components := []string{""}
+	if e.File.Package != nil {
+		components = append(components, e.File.GetPackage())
+	}
+	components = append(components, e.Outers...)
+	components = append(components, e.GetName())
+	return strings.Join(components, ".")
+}
+
 // Service wraps descriptor.ServiceDescriptorProto for richer features.
 type Service struct {
 	// File is the file where this service is defined.