add graphql

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

example/example.proto

@@ -6,32 +6,20 @@ option go_package = "github.com/unistack-org/protoc-gen-go-micro/v3/example;exam
 
 import "tag/tag.proto";
 import "api/annotations.proto";
-import "openapiv2/annotations.proto";
+import "openapiv3/annotations.proto";
-import "google/protobuf/wrappers.proto";
+//import "google/protobuf/wrappers.proto";
-import "graphql.proto";
+import "graphql/graphql.proto";
 
 service Example {
-  option (graphql.service) = {
-    host: "localhost:9090";
-  };
 	rpc Call(CallReq) returns (CallRsp) {
-    option (graphql.schema) = {
+    option (micro.graphql.rpc) = {type: QUERY};
-      type: QUERY
-      name: "Call"
-    };
     option (micro.openapiv3.openapiv3_operation) = {
       operation_id: "Call";
       responses: {
-          key: "default";
+        default: {
-          value: {
+          reference: {_ref: ".example.Error"};
-            description: "Error response";
+        };
-            schema: {
+      };
-              json_schema: {
-                ref: ".example.Error";
-              }
-            }
-          }
-        }
     };
 		option (micro.api.http) = { post: "/v1/example/call/{name}"; body: "*"; };
 		option (micro.api.micro_method) = { timeout: "5s"; };
@@ -39,7 +27,7 @@ service Example {
 };
 
 message CallReq {
-  string name = 1 [(micro.tag.tags) = "xml:\",attr\"" ];
+  string name = 1 [(micro.graphql.field) = {required: true}]; 
   string req = 2;
 };
 

example/schema.graphql

@@ -0,0 +1,11 @@
+directive @Example on FIELD_DEFINITION
+input CallReqInput {
+	name: String!
+	req: String
+}
+type CallRsp {
+	rsp: String
+}
+type Query {
+	exampleCall(in: CallReqInput): CallRsp
+}

generate.go

@@ -0,0 +1,3 @@
+package main
+
+//go:generate sh -xc "protoc -I./example -I. -I$(go list -f '{{ .Dir }}' -m go.unistack.org/micro-proto/v3) --go-micro_out=components=graphqls,graphql_file=./schema.graphql:./example example/example.proto"

go.mod

@@ -5,17 +5,17 @@ go 1.20
 require (
 	github.com/danielvladco/go-proto-gql v0.10.0
 	github.com/fatih/structtag v1.2.0
+	github.com/jhump/protoreflect v1.7.1
 	github.com/vektah/gqlparser/v2 v2.5.1
 	go.unistack.org/micro-proto/v3 v3.4.1
 	golang.org/x/tools v0.11.0
-	google.golang.org/protobuf v1.31.0
+	google.golang.org/protobuf v1.28.1
 )
 
 require (
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/gnostic v0.6.9 // indirect
 	github.com/google/go-cmp v0.5.9 // indirect
-	github.com/jhump/protoreflect v1.7.1 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	golang.org/x/mod v0.12.0 // indirect
 	golang.org/x/sys v0.10.0 // indirect

go.sum

@@ -190,8 +190,8 @@ google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlba
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

graphql.go

@@ -0,0 +1,9 @@
+package main
+
+import (
+	"google.golang.org/protobuf/compiler/protogen"
+)
+
+func (g *Generator) graphqlGenerate(plugin *protogen.Plugin) error {
+	return nil
+}

graphql/callstack.go

@@ -0,0 +1,32 @@
+package generator
+
+type Callstack interface {
+	Push(entry interface{})
+	Pop(entry interface{})
+	Has(entry interface{}) bool
+}
+
+func NewCallstack() Callstack {
+	return &callstack{stack: make(map[interface{}]int), index: 0}
+}
+
+type callstack struct {
+	stack  map[interface{}]int
+	sorted []string
+	index  int
+}
+
+func (c *callstack) Pop(entry interface{}) {
+	delete(c.stack, entry)
+	c.index--
+}
+
+func (c *callstack) Push(entry interface{}) {
+	c.stack[entry] = c.index
+	c.index++
+}
+
+func (c *callstack) Has(entry interface{}) bool {
+	_, ok := c.stack[entry]
+	return ok
+}

graphql/descriptors.go

@@ -0,0 +1,77 @@
+package generator
+
+import (
+	"strings"
+
+	"github.com/jhump/protoreflect/desc"
+	"github.com/vektah/gqlparser/v2/ast"
+	any "google.golang.org/protobuf/types/known/anypb"
+)
+
+type ObjectDescriptor struct {
+	*ast.Definition
+	desc.Descriptor
+
+	types      []*ObjectDescriptor
+	fields     []*FieldDescriptor
+	fieldNames map[string]*FieldDescriptor
+}
+
+func (o *ObjectDescriptor) AsGraphql() *ast.Definition {
+	return o.Definition
+}
+
+func (o *ObjectDescriptor) uniqueName(f *desc.FieldDescriptor) string {
+	return strings.Title(f.GetName())
+}
+
+func (o *ObjectDescriptor) IsInput() bool {
+	return o.Kind == ast.InputObject
+}
+
+func (o *ObjectDescriptor) GetFields() []*FieldDescriptor {
+	return o.fields
+}
+
+func (o *ObjectDescriptor) GetTypes() []*ObjectDescriptor {
+	return o.types
+}
+
+func (o *ObjectDescriptor) IsMessage() bool {
+	_, ok := o.Descriptor.(*desc.MessageDescriptor)
+	return ok
+}
+
+// same isEmpty but for mortals
+func IsEmpty(o *desc.MessageDescriptor) bool { return isEmpty(o, NewCallstack()) }
+
+// make sure objects are fulled with all objects
+func isEmpty(o *desc.MessageDescriptor, callstack Callstack) bool {
+	callstack.Push(o)
+	defer callstack.Pop(o)
+
+	if len(o.GetFields()) == 0 {
+		return true
+	}
+	for _, f := range o.GetFields() {
+		objType := f.GetMessageType()
+		if objType == nil {
+			return false
+		}
+
+		// check if the call stack already contains a reference to this type and prevent it from calling itself again
+		if callstack.Has(objType) {
+			return true
+		}
+		if !isEmpty(objType, callstack) {
+			return false
+		}
+	}
+
+	return true
+}
+
+// TODO maybe not compare by strings
+func IsAny(o *desc.MessageDescriptor) bool {
+	return string((&any.Any{}).ProtoReflect().Descriptor().FullName()) == o.GetFullyQualifiedName()
+}

graphql/generator.go

@@ -0,0 +1,761 @@
+package generator
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/jhump/protoreflect/desc"
+	"github.com/vektah/gqlparser/v2/ast"
+	"google.golang.org/protobuf/compiler/protogen"
+	descriptor "google.golang.org/protobuf/types/descriptorpb"
+
+	gqlpb "go.unistack.org/micro-proto/v3/graphql"
+)
+
+const (
+	fieldPrefix        = "Field"
+	inputSuffix        = "Input"
+	typeSep            = "_"
+	packageSep         = "."
+	anyTypeDescription = "Any is any json type"
+	scalarBytes        = "Bytes"
+	goFieldDirective   = "goField"
+
+	DefaultExtension = "graphql"
+)
+
+func NewSchemas(descs []*desc.FileDescriptor, mergeSchemas, genServiceDesc bool, plugin *protogen.Plugin) (schemas SchemaDescriptorList, err error) {
+	var files []*descriptor.FileDescriptorProto
+	for _, d := range descs {
+		files = append(files, d.AsFileDescriptorProto())
+	}
+	var goref GoRef
+	if plugin != nil {
+		goref, err = NewGoRef(plugin)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if mergeSchemas {
+		schema := NewSchemaDescriptor(genServiceDesc, goref)
+		for _, file := range descs {
+			err := generateFile(file, schema)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		return []*SchemaDescriptor{schema}, nil
+	}
+
+	for _, file := range descs {
+		schema := NewSchemaDescriptor(genServiceDesc, goref)
+		err := generateFile(file, schema)
+		if err != nil {
+			return nil, err
+		}
+
+		schemas = append(schemas, schema)
+	}
+
+	return
+}
+
+func generateFile(file *desc.FileDescriptor, schema *SchemaDescriptor) error {
+	schema.FileDescriptors = append(schema.FileDescriptors, file)
+
+	for _, svc := range file.GetServices() {
+		svcOpts := GraphqlServiceOptions(svc.AsServiceDescriptorProto().GetOptions())
+		if svcOpts != nil && svcOpts.Ignore != nil && *svcOpts.Ignore {
+			continue
+		}
+		for _, rpc := range svc.GetMethods() {
+			rpcOpts := GraphqlMethodOptions(rpc.AsMethodDescriptorProto().GetOptions())
+			if rpcOpts != nil && rpcOpts.Ignore != nil && *rpcOpts.Ignore {
+				continue
+			}
+			in, err := schema.CreateObjects(rpc.GetInputType(), true)
+			if err != nil {
+				return err
+			}
+
+			out, err := schema.CreateObjects(rpc.GetOutputType(), false)
+			if err != nil {
+				return err
+			}
+
+			if rpc.IsServerStreaming() && rpc.IsClientStreaming() {
+				schema.GetMutation().addMethod(svc, rpc, in, out)
+			}
+
+			if rpc.IsServerStreaming() {
+				schema.GetSubscription().addMethod(svc, rpc, in, out)
+			} else {
+				switch GetRequestType(rpcOpts, svcOpts) {
+				case gqlpb.Type_QUERY:
+					schema.GetQuery().addMethod(svc, rpc, in, out)
+				default:
+					schema.GetMutation().addMethod(svc, rpc, in, out)
+				}
+			}
+		}
+	}
+
+	return nil
+}
+
+type SchemaDescriptorList []*SchemaDescriptor
+
+func (s SchemaDescriptorList) AsGraphql() (astSchema []*ast.Schema) {
+	for _, ss := range s {
+		astSchema = append(astSchema, ss.AsGraphql())
+	}
+	return
+}
+
+func (s SchemaDescriptorList) GetForDescriptor(file *protogen.File) *SchemaDescriptor {
+	for _, schema := range s {
+		for _, d := range schema.FileDescriptors {
+			if d.AsFileDescriptorProto() == file.Proto {
+				return schema
+			}
+		}
+	}
+	return nil
+}
+
+func NewSchemaDescriptor(genServiceDesc bool, goref GoRef) *SchemaDescriptor {
+	sd := &SchemaDescriptor{
+		Directives:                 map[string]*ast.DirectiveDefinition{},
+		reservedNames:              map[string]desc.Descriptor{},
+		createdObjects:             map[createdObjectKey]*ObjectDescriptor{},
+		generateServiceDescriptors: genServiceDesc,
+		goRef:                      goref,
+	}
+	for _, name := range graphqlReservedNames {
+		sd.reservedNames[name] = nil
+	}
+	return sd
+}
+
+type SchemaDescriptor struct {
+	Directives      map[string]*ast.DirectiveDefinition
+	FileDescriptors []*desc.FileDescriptor
+
+	files []*desc.FileDescriptor
+
+	query        *RootDefinition
+	mutation     *RootDefinition
+	subscription *RootDefinition
+
+	objects []*ObjectDescriptor
+
+	reservedNames  map[string]desc.Descriptor
+	createdObjects map[createdObjectKey]*ObjectDescriptor
+
+	generateServiceDescriptors bool
+
+	goRef GoRef
+}
+
+type createdObjectKey struct {
+	desc  desc.Descriptor
+	input bool
+}
+
+func (s *SchemaDescriptor) AsGraphql() *ast.Schema {
+	queryDef := *s.GetQuery().Definition
+	mutationDef := *s.GetMutation().Definition
+	subscriptionsDef := *s.GetSubscription().Definition
+	schema := &ast.Schema{Types: map[string]*ast.Definition{}, Directives: s.Directives}
+	schema.Query = &queryDef
+	schema.Types["Query"] = &queryDef
+	if s.query.methods == nil {
+		schema.Query.Fields = append(schema.Query.Fields, &ast.FieldDefinition{
+			Name: "dummy",
+			Type: ast.NamedType("Boolean", &ast.Position{}),
+		})
+	}
+	if s.mutation.methods != nil {
+		schema.Mutation = &mutationDef
+		schema.Types["Mutation"] = &mutationDef
+	}
+	if s.subscription.methods != nil {
+		schema.Subscription = &subscriptionsDef
+		schema.Types["Subscription"] = &subscriptionsDef
+	}
+
+	for _, o := range s.objects {
+		def := o.AsGraphql()
+		schema.Types[def.Name] = def
+	}
+	return schema
+}
+
+func (s *SchemaDescriptor) Objects() []*ObjectDescriptor {
+	return s.objects
+}
+
+func (s *SchemaDescriptor) GetMutation() *RootDefinition {
+	if s.mutation == nil {
+		s.mutation = NewRootDefinition(Mutation, s)
+	}
+	return s.mutation
+}
+
+func (s *SchemaDescriptor) GetSubscription() *RootDefinition {
+	if s.subscription == nil {
+		s.subscription = NewRootDefinition(Subscription, s)
+	}
+	return s.subscription
+}
+
+func (s *SchemaDescriptor) GetQuery() *RootDefinition {
+	if s.query == nil {
+		s.query = NewRootDefinition(Query, s)
+	}
+
+	return s.query
+}
+
+// make name be unique
+// just create a map and register every name
+func (s *SchemaDescriptor) uniqueName(d desc.Descriptor, input bool) (name string) {
+	var collisionPrefix string
+	var suffix string
+	if _, ok := d.(*desc.MessageDescriptor); input && ok {
+		suffix = inputSuffix
+	}
+	name = strings.Title(CamelCaseSlice(strings.Split(strings.TrimPrefix(d.GetFullyQualifiedName(), d.GetFile().GetPackage()+packageSep), packageSep)) + suffix)
+
+	if _, ok := d.(*desc.FieldDescriptor); ok {
+		collisionPrefix = fieldPrefix
+		name = CamelCaseSlice(strings.Split(strings.Trim(d.GetParent().GetName()+packageSep+strings.Title(d.GetName()), packageSep), packageSep))
+	} else {
+		collisionPrefix = CamelCaseSlice(strings.Split(d.GetFile().GetPackage(), packageSep))
+	}
+
+	originalName := name
+	for uniqueSuffix := 0; ; uniqueSuffix++ {
+		d2, ok := s.reservedNames[name]
+		if !ok {
+			break
+		}
+		if d2 == d {
+			return name
+		}
+		if uniqueSuffix == 0 {
+			name = collisionPrefix + typeSep + originalName
+			continue
+		}
+		name = collisionPrefix + typeSep + originalName + strconv.Itoa(uniqueSuffix)
+	}
+
+	s.reservedNames[name] = d
+	return
+}
+
+func (s *SchemaDescriptor) CreateObjects(d desc.Descriptor, input bool) (obj *ObjectDescriptor, err error) {
+	// the case if trying to resolve a primitive as a object. In this case we just return nil
+	if d == nil {
+		return
+	}
+	if obj, ok := s.createdObjects[createdObjectKey{d, input}]; ok {
+		return obj, nil
+	}
+
+	obj = &ObjectDescriptor{
+		Definition: &ast.Definition{
+			Description: getDescription(d),
+			Name:        s.uniqueName(d, input),
+			Position:    &ast.Position{},
+		},
+		Descriptor: d,
+	}
+
+	s.createdObjects[createdObjectKey{d, input}] = obj
+
+	switch dd := d.(type) {
+	case *desc.MessageDescriptor:
+		if IsEmpty(dd) {
+			return obj, nil
+		}
+		if IsAny(dd) {
+			// TODO find a better way to handle any types
+			delete(s.createdObjects, createdObjectKey{d, input})
+			any := s.createScalar(s.uniqueName(dd, false), anyTypeDescription)
+			return any, nil
+		}
+
+		kind := ast.Object
+		if input {
+			kind = ast.InputObject
+		}
+		fields := FieldDescriptorList{}
+		outputOneofRegistrar := map[*desc.OneOfDescriptor]struct{}{}
+
+		for _, df := range dd.GetFields() {
+			fieldOpts := GraphqlFieldOptions(df.AsFieldDescriptorProto().GetOptions())
+			if fieldOpts != nil && fieldOpts.Ignore != nil && *fieldOpts.Ignore {
+				continue
+			}
+			var fieldDirective []*ast.Directive
+			if df.GetType() == descriptor.FieldDescriptorProto_TYPE_MESSAGE && IsEmpty(df.GetMessageType()) {
+				continue
+			}
+
+			// Internally `optional` fields are represented as a oneof, and as such should be skipped.
+			if oneof := df.GetOneOf(); oneof != nil && !df.AsFieldDescriptorProto().GetProto3Optional() {
+				opts := GraphqlOneofOptions(oneof.AsOneofDescriptorProto().GetOptions())
+				if opts.GetIgnore() {
+					continue
+				}
+				if !input {
+					if _, ok := outputOneofRegistrar[oneof]; ok {
+						continue
+					}
+					outputOneofRegistrar[oneof] = struct{}{}
+					field, err := s.createUnion(oneof)
+					if err != nil {
+						return nil, err
+					}
+					fields = append(fields, field)
+					continue
+				}
+
+				// create oneofs as directives for input objects
+				directive := &ast.DirectiveDefinition{
+					Description: getDescription(oneof),
+					Name:        s.uniqueName(oneof, input),
+					Locations:   []ast.DirectiveLocation{ast.LocationInputFieldDefinition},
+					Position:    &ast.Position{Src: &ast.Source{}},
+				}
+				s.Directives[directive.Name] = directive
+				fieldDirective = append(fieldDirective, &ast.Directive{
+					Name:     directive.Name,
+					Position: &ast.Position{Src: &ast.Source{}},
+					// ParentDefinition: obj.Definition, TODO
+					Definition: directive,
+					Location:   ast.LocationInputFieldDefinition,
+				})
+			}
+
+			fieldObj, err := s.CreateObjects(resolveFieldType(df), input)
+			if err != nil {
+				return nil, err
+			}
+			if fieldObj == nil && df.GetMessageType() != nil {
+				continue
+			}
+			f, err := s.createField(df, fieldObj)
+			if err != nil {
+				return nil, err
+			}
+			f.Directives = append(f.Directives, fieldDirective...)
+			fields = append(fields, f)
+		}
+
+		obj.Definition.Fields = fields.AsGraphql()
+		obj.Definition.Kind = kind
+		obj.fields = fields
+	case *desc.EnumDescriptor:
+		obj.Definition.Kind = ast.Enum
+		obj.Definition.EnumValues = enumValues(dd.GetValues())
+	default:
+		panic(fmt.Sprintf("received unexpected value %v of type %T", dd, dd))
+	}
+
+	s.objects = append(s.objects, obj)
+	return obj, nil
+}
+
+func resolveFieldType(field *desc.FieldDescriptor) desc.Descriptor {
+	msgType := field.GetMessageType()
+	enumType := field.GetEnumType()
+	if msgType != nil {
+		return msgType
+	}
+	if enumType != nil {
+		return enumType
+	}
+	return nil
+}
+
+func enumValues(evals []*desc.EnumValueDescriptor) (vlist ast.EnumValueList) {
+	for _, eval := range evals {
+		vlist = append(vlist, &ast.EnumValueDefinition{
+			Description: getDescription(eval),
+			Name:        eval.GetName(),
+			Position:    &ast.Position{},
+		})
+	}
+
+	return vlist
+}
+
+type FieldDescriptorList []*FieldDescriptor
+
+func (fl FieldDescriptorList) AsGraphql() (dl []*ast.FieldDefinition) {
+	for _, f := range fl {
+		dl = append(dl, f.FieldDefinition)
+	}
+	return dl
+}
+
+type FieldDescriptor struct {
+	*ast.FieldDefinition
+	*desc.FieldDescriptor
+
+	typ *ObjectDescriptor
+}
+
+func (f *FieldDescriptor) GetType() *ObjectDescriptor {
+	return f.typ
+}
+
+type MethodDescriptor struct {
+	*desc.ServiceDescriptor
+	*desc.MethodDescriptor
+
+	*ast.FieldDefinition
+
+	input  *ObjectDescriptor
+	output *ObjectDescriptor
+}
+
+func (m *MethodDescriptor) AsGraphql() *ast.FieldDefinition {
+	return m.FieldDefinition
+}
+
+func (m *MethodDescriptor) GetInput() *ObjectDescriptor {
+	return m.input
+}
+
+func (m *MethodDescriptor) GetOutput() *ObjectDescriptor {
+	return m.output
+}
+
+type RootDefinition struct {
+	*ast.Definition
+
+	Parent *SchemaDescriptor
+
+	methods       []*MethodDescriptor
+	reservedNames map[string]ServiceAndMethod
+}
+
+type ServiceAndMethod struct {
+	svc *descriptor.ServiceDescriptorProto
+	rpc *descriptor.MethodDescriptorProto
+}
+
+func (r *RootDefinition) UniqueName(svc *descriptor.ServiceDescriptorProto, rpc *descriptor.MethodDescriptorProto) (name string) {
+	rpcOpts := GraphqlMethodOptions(rpc.GetOptions())
+	svcOpts := GraphqlServiceOptions(svc.GetOptions())
+	if rpcOpts != nil && rpcOpts.Name != nil {
+		name = *rpcOpts.Name
+	} else if svcOpts != nil && svcOpts.Name != nil {
+		if *svcOpts.Name == "" {
+			name = ToLowerFirst(rpc.GetName())
+		} else {
+			name = *svcOpts.Name + strings.Title(rpc.GetName())
+		}
+	} else {
+		name = ToLowerFirst(svc.GetName()) + strings.Title(rpc.GetName())
+	}
+
+	originalName := name
+	for uniqueSuffix := 0; ; uniqueSuffix++ {
+		snm, ok := r.reservedNames[name]
+		if !ok {
+			break
+		}
+		if svc == snm.svc && snm.rpc == rpc {
+			return name
+		}
+		name = originalName + strconv.Itoa(uniqueSuffix)
+	}
+
+	r.reservedNames[name] = ServiceAndMethod{svc, rpc}
+	return
+}
+
+func (r *RootDefinition) Methods() []*MethodDescriptor {
+	return r.methods
+}
+
+func (r *RootDefinition) addMethod(svc *desc.ServiceDescriptor, rpc *desc.MethodDescriptor, in, out *ObjectDescriptor) {
+	var args ast.ArgumentDefinitionList
+
+	if in != nil && (in.Descriptor != nil && !IsEmpty(in.Descriptor.(*desc.MessageDescriptor)) || in.Definition.Kind == ast.Scalar) {
+		args = append(args, &ast.ArgumentDefinition{
+			Name:     "in",
+			Type:     ast.NamedType(in.Name, &ast.Position{}),
+			Position: &ast.Position{},
+		})
+	}
+	objType := ast.NamedType("Boolean", &ast.Position{})
+	if out != nil && (out.Descriptor != nil && !IsEmpty(out.Descriptor.(*desc.MessageDescriptor)) || in.Definition.Kind == ast.Scalar) {
+		objType = ast.NamedType(out.Name, &ast.Position{})
+	}
+
+	svcDir := &ast.DirectiveDefinition{
+		Description: getDescription(svc),
+		Name:        svc.GetName(),
+		Locations:   []ast.DirectiveLocation{ast.LocationFieldDefinition},
+		Position:    &ast.Position{Src: &ast.Source{}},
+	}
+	r.Parent.Directives[svcDir.Name] = svcDir
+
+	m := &MethodDescriptor{
+		ServiceDescriptor: svc,
+		MethodDescriptor:  rpc,
+		FieldDefinition: &ast.FieldDefinition{
+			Description: getDescription(rpc),
+			Name:        r.UniqueName(svc.AsServiceDescriptorProto(), rpc.AsMethodDescriptorProto()),
+			Arguments:   args,
+			Type:        objType,
+			Position:    &ast.Position{},
+		},
+		input:  in,
+		output: out,
+	}
+	if r.Parent.generateServiceDescriptors {
+		m.Directives = []*ast.Directive{{
+			Name:       svcDir.Name,
+			Position:   &ast.Position{},
+			Definition: svcDir,
+			Location:   svcDir.Locations[0],
+		}}
+	}
+
+	r.methods = append(r.methods, m)
+	// TODO maybe not do it here?
+	r.Definition.Fields = append(r.Definition.Fields, m.FieldDefinition)
+}
+
+type rootName string
+
+const (
+	Mutation     rootName = "Mutation"
+	Query        rootName = "Query"
+	Subscription rootName = "Subscription"
+)
+
+func NewRootDefinition(name rootName, parent *SchemaDescriptor) *RootDefinition {
+	return &RootDefinition{Definition: &ast.Definition{
+		Kind:     ast.Object,
+		Name:     string(name),
+		Position: &ast.Position{},
+	}, Parent: parent, reservedNames: map[string]ServiceAndMethod{}}
+}
+
+func getDescription(descs ...desc.Descriptor) string {
+	var description []string
+	for _, d := range descs {
+		info := d.GetSourceInfo()
+		if info == nil {
+			continue
+		}
+		if info.LeadingComments != nil {
+			description = append(description, *info.LeadingComments)
+		}
+		if info.TrailingComments != nil {
+			description = append(description, *info.TrailingComments)
+		}
+	}
+
+	return strings.Join(description, "\n")
+}
+
+func (s *SchemaDescriptor) createField(field *desc.FieldDescriptor, obj *ObjectDescriptor) (_ *FieldDescriptor, err error) {
+	fieldAst := &ast.FieldDefinition{
+		Description: getDescription(field),
+		Name:        ToLowerFirst(CamelCase(field.GetName())),
+		Type:        &ast.Type{Position: &ast.Position{}},
+		Position:    &ast.Position{},
+	}
+	fieldOpts := GraphqlFieldOptions(field.AsFieldDescriptorProto().GetOptions())
+	if fieldOpts != nil && fieldOpts.Name != nil {
+		fieldAst.Name = *fieldOpts.Name
+		directive := &ast.DirectiveDefinition{
+			Name: goFieldDirective,
+			Arguments: []*ast.ArgumentDefinition{{
+				Name:     "forceResolver",
+				Type:     ast.NamedType("Boolean", &ast.Position{}),
+				Position: &ast.Position{},
+			}, {
+				Name:     "name",
+				Type:     ast.NamedType("String", &ast.Position{}),
+				Position: &ast.Position{},
+			}},
+			Locations: []ast.DirectiveLocation{ast.LocationInputFieldDefinition, ast.LocationFieldDefinition},
+			Position:  &ast.Position{Src: &ast.Source{}},
+		}
+		s.Directives[directive.Name] = directive
+		if s.goRef != nil {
+			fieldAst.Directives = []*ast.Directive{{
+				Name: directive.Name,
+				Arguments: []*ast.Argument{{
+					Name: "name",
+					Value: &ast.Value{
+						Raw:      s.goRef.FindGoField(field.GetFullyQualifiedName()).GoName,
+						Kind:     ast.StringValue,
+						Position: &ast.Position{},
+					},
+					Position: &ast.Position{},
+				}},
+				Position: &ast.Position{},
+				// ParentDefinition: nil, TODO
+				Definition: directive,
+			}}
+		}
+	}
+	switch field.GetType() {
+	case descriptor.FieldDescriptorProto_TYPE_DOUBLE,
+		descriptor.FieldDescriptorProto_TYPE_FLOAT:
+		fieldAst.Type.NamedType = ScalarFloat
+
+	case descriptor.FieldDescriptorProto_TYPE_BYTES:
+		scalar := s.createScalar(scalarBytes, "")
+		fieldAst.Type.NamedType = scalar.Name
+
+	case descriptor.FieldDescriptorProto_TYPE_INT64,
+		descriptor.FieldDescriptorProto_TYPE_SINT64,
+		descriptor.FieldDescriptorProto_TYPE_SFIXED64,
+		descriptor.FieldDescriptorProto_TYPE_INT32,
+		descriptor.FieldDescriptorProto_TYPE_SINT32,
+		descriptor.FieldDescriptorProto_TYPE_SFIXED32,
+		descriptor.FieldDescriptorProto_TYPE_UINT32,
+		descriptor.FieldDescriptorProto_TYPE_FIXED32,
+		descriptor.FieldDescriptorProto_TYPE_UINT64,
+		descriptor.FieldDescriptorProto_TYPE_FIXED64:
+		fieldAst.Type.NamedType = ScalarInt
+
+	case descriptor.FieldDescriptorProto_TYPE_BOOL:
+		fieldAst.Type.NamedType = ScalarBoolean
+
+	case descriptor.FieldDescriptorProto_TYPE_STRING:
+		fieldAst.Type.NamedType = ScalarString
+
+	case descriptor.FieldDescriptorProto_TYPE_GROUP:
+		return nil, fmt.Errorf("proto2 groups are not supported please use proto3 syntax")
+
+	case descriptor.FieldDescriptorProto_TYPE_ENUM:
+		fieldAst.Type.NamedType = obj.Name
+
+	case descriptor.FieldDescriptorProto_TYPE_MESSAGE:
+		fieldAst.Type.NamedType = obj.Name
+
+	default:
+		panic("unknown proto field type")
+	}
+
+	if isRepeated(field) {
+		fieldAst.Type = ast.ListType(fieldAst.Type, &ast.Position{})
+		fieldAst.Type.Elem.NonNull = true
+	}
+	if isRequired(field) {
+		fieldAst.Type.NonNull = true
+	}
+
+	return &FieldDescriptor{
+		FieldDefinition: fieldAst,
+		FieldDescriptor: field,
+		typ:             obj,
+	}, nil
+}
+
+func (s *SchemaDescriptor) createScalar(name string, description string) *ObjectDescriptor {
+	obj := &ObjectDescriptor{
+		Definition: &ast.Definition{
+			Kind:        ast.Scalar,
+			Description: description,
+			Name:        name,
+			Position:    &ast.Position{},
+		},
+	}
+	s.objects = append(s.objects, obj)
+	return obj
+}
+
+func (s *SchemaDescriptor) createUnion(oneof *desc.OneOfDescriptor) (*FieldDescriptor, error) {
+	var types []string
+	var objTypes []*ObjectDescriptor
+	for _, choice := range oneof.GetChoices() {
+		obj, err := s.CreateObjects(resolveFieldType(choice), false)
+		if err != nil {
+			return nil, err
+		}
+		f, err := s.createField(choice, obj)
+		if err != nil {
+			return nil, err
+		}
+
+		obj = &ObjectDescriptor{
+			Definition: &ast.Definition{
+				Kind:        ast.Object,
+				Description: getDescription(f),
+				Name:        s.uniqueName(choice, false),
+				Fields:      ast.FieldList{f.FieldDefinition},
+				Position:    &ast.Position{},
+			},
+			Descriptor: f,
+			fields:     []*FieldDescriptor{f},
+			fieldNames: map[string]*FieldDescriptor{},
+		}
+		s.objects = append(s.objects, obj)
+		types = append(types, obj.Name)
+		objTypes = append(objTypes, obj)
+	}
+	obj := &ObjectDescriptor{
+		Definition: &ast.Definition{
+			Kind:        ast.Union,
+			Description: getDescription(oneof),
+			Name:        s.uniqueName(oneof, false),
+			Types:       types,
+			Position:    &ast.Position{},
+		},
+		Descriptor: oneof,
+		types:      objTypes,
+	}
+	s.objects = append(s.objects, obj)
+	name := ToLowerFirst(CamelCase(oneof.GetName()))
+	opts := GraphqlOneofOptions(oneof.AsOneofDescriptorProto().GetOptions())
+	if opts.GetName() != "" {
+		name = opts.GetName()
+	}
+	return &FieldDescriptor{
+		FieldDefinition: &ast.FieldDefinition{
+			Description: getDescription(oneof),
+			Name:        name,
+			Type:        ast.NamedType(obj.Name, &ast.Position{}),
+			Position:    &ast.Position{},
+		},
+		FieldDescriptor: nil,
+		typ:             obj,
+	}, nil
+}
+
+func isRepeated(field *desc.FieldDescriptor) bool {
+	return field.GetLabel() == descriptor.FieldDescriptorProto_LABEL_REPEATED
+}
+
+func isRequired(field *desc.FieldDescriptor) bool {
+	if v := GraphqlFieldOptions(field.AsFieldDescriptorProto().GetOptions()); v != nil {
+		return v.GetRequired()
+	}
+	return false
+}
+
+const (
+	ScalarInt     = "Int"
+	ScalarFloat   = "Float"
+	ScalarString  = "String"
+	ScalarBoolean = "Boolean"
+	ScalarID      = "ID"
+)
+
+var graphqlReservedNames = []string{"__Directive", "__Type", "__Field", "__EnumValue", "__InputValue", "__Schema", "Int", "Float", "String", "Boolean", "ID"}

graphql/goreference.go

@@ -0,0 +1,30 @@
+package generator
+
+import (
+	"google.golang.org/protobuf/compiler/protogen"
+)
+
+type GoRef interface {
+	FindGoField(field string) *protogen.Field
+}
+
+func NewGoRef(p *protogen.Plugin) (GoRef, error) {
+	return goRef{p}, nil
+}
+
+type goRef struct {
+	*protogen.Plugin
+}
+
+func (g goRef) FindGoField(field string) *protogen.Field {
+	for _, file := range g.Files {
+		for _, msg := range file.Messages {
+			for _, f := range msg.Fields {
+				if string(f.Desc.FullName()) == field {
+					return f
+				}
+			}
+		}
+	}
+	return nil
+}

graphql/registry.go

@@ -0,0 +1,139 @@
+package generator
+
+import (
+	"sync"
+
+	"github.com/jhump/protoreflect/desc"
+	"github.com/vektah/gqlparser/v2/ast"
+)
+
+type Registry interface {
+	FindMethodByName(op ast.Operation, name string) *desc.MethodDescriptor
+	FindObjectByName(name string) *desc.MessageDescriptor
+
+	// FindObjectByFullyQualifiedName TODO maybe find a better way to get ast definition
+	FindObjectByFullyQualifiedName(fqn string) (*desc.MessageDescriptor, *ast.Definition)
+
+	// FindFieldByName given the proto Descriptor and the graphql field name get the the proto FieldDescriptor
+	FindFieldByName(msg desc.Descriptor, name string) *desc.FieldDescriptor
+
+	// FindUnionFieldByMessageFQNAndName given the proto Descriptor and the graphql field name get the the proto FieldDescriptor
+	FindUnionFieldByMessageFQNAndName(fqn, name string) *desc.FieldDescriptor
+
+	FindGraphqlFieldByProtoField(msg *ast.Definition, name string) *ast.FieldDefinition
+}
+
+func NewRegistry(files SchemaDescriptorList) Registry {
+	v := &repository{
+		mu:                       &sync.RWMutex{},
+		methodsByName:            map[ast.Operation]map[string]*desc.MethodDescriptor{},
+		objectsByName:            map[string]*desc.MessageDescriptor{},
+		objectsByFQN:             map[string]*ObjectDescriptor{},
+		graphqlFieldsByName:      map[desc.Descriptor]map[string]*desc.FieldDescriptor{},
+		graphqlUnionFieldsByName: map[string]map[string]*desc.FieldDescriptor{},
+		protoFieldsByName:        map[*ast.Definition]map[string]*ast.FieldDefinition{},
+	}
+	for _, f := range files {
+		v.methodsByName[ast.Mutation] = map[string]*desc.MethodDescriptor{}
+		for _, m := range f.GetMutation().Methods() {
+			v.methodsByName[ast.Mutation][m.Name] = m.MethodDescriptor
+		}
+		v.methodsByName[ast.Query] = map[string]*desc.MethodDescriptor{}
+		for _, m := range f.GetQuery().Methods() {
+			v.methodsByName[ast.Query][m.Name] = m.MethodDescriptor
+		}
+		v.methodsByName[ast.Subscription] = map[string]*desc.MethodDescriptor{}
+		for _, m := range f.GetSubscription().Methods() {
+			v.methodsByName[ast.Subscription][m.Name] = m.MethodDescriptor
+		}
+	}
+	for _, f := range files {
+		for _, m := range f.Objects() {
+			switch m.Kind {
+			case ast.Union:
+				fqn := m.Descriptor.GetParent().GetFullyQualifiedName()
+				if _, ok := v.graphqlUnionFieldsByName[fqn]; !ok {
+					v.graphqlUnionFieldsByName[fqn] = map[string]*desc.FieldDescriptor{}
+				}
+				for _, tt := range m.GetTypes() {
+					for _, f := range tt.GetFields() {
+						v.graphqlUnionFieldsByName[fqn][f.Name] = f.FieldDescriptor
+					}
+				}
+			case ast.Object:
+				v.protoFieldsByName[m.Definition] = map[string]*ast.FieldDefinition{}
+				for _, f := range m.GetFields() {
+					if f.FieldDescriptor != nil {
+						v.protoFieldsByName[m.Definition][f.FieldDescriptor.GetName()] = f.FieldDefinition
+					}
+				}
+			case ast.InputObject:
+				v.graphqlFieldsByName[m.Descriptor] = map[string]*desc.FieldDescriptor{}
+				for _, f := range m.GetFields() {
+					v.graphqlFieldsByName[m.Descriptor][f.Name] = f.FieldDescriptor
+				}
+			}
+			switch msgDesc := m.Descriptor.(type) {
+			case *desc.MessageDescriptor:
+				v.objectsByFQN[m.GetFullyQualifiedName()] = m
+				v.objectsByName[m.Name] = msgDesc
+			}
+		}
+	}
+	return v
+}
+
+type repository struct {
+	files SchemaDescriptorList
+	mu    *sync.RWMutex
+
+	methodsByName            map[ast.Operation]map[string]*desc.MethodDescriptor
+	objectsByName            map[string]*desc.MessageDescriptor
+	objectsByFQN             map[string]*ObjectDescriptor
+	graphqlFieldsByName      map[desc.Descriptor]map[string]*desc.FieldDescriptor
+	protoFieldsByName        map[*ast.Definition]map[string]*ast.FieldDefinition
+	graphqlUnionFieldsByName map[string]map[string]*desc.FieldDescriptor
+}
+
+func (r repository) FindMethodByName(op ast.Operation, name string) *desc.MethodDescriptor {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	m, _ := r.methodsByName[op][name]
+	return m
+}
+
+func (r repository) FindObjectByName(name string) *desc.MessageDescriptor {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	o, _ := r.objectsByName[name]
+	return o
+}
+
+func (r repository) FindObjectByFullyQualifiedName(fqn string) (*desc.MessageDescriptor, *ast.Definition) {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	o, _ := r.objectsByFQN[fqn]
+	msg, _ := o.Descriptor.(*desc.MessageDescriptor)
+	return msg, o.Definition
+}
+
+func (r repository) FindFieldByName(msg desc.Descriptor, name string) *desc.FieldDescriptor {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	f, _ := r.graphqlFieldsByName[msg][name]
+	return f
+}
+
+func (r repository) FindUnionFieldByMessageFQNAndName(fqn, name string) *desc.FieldDescriptor {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	f, _ := r.graphqlUnionFieldsByName[fqn][name]
+	return f
+}
+
+func (r repository) FindGraphqlFieldByProtoField(msg *ast.Definition, name string) *ast.FieldDefinition {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	f, _ := r.protoFieldsByName[msg][name]
+	return f
+}

graphql/utils.go

@@ -0,0 +1,291 @@
+package generator
+
+import (
+	"strings"
+	"unicode"
+	"unicode/utf8"
+
+	"github.com/jhump/protoreflect/desc"
+	"google.golang.org/protobuf/proto"
+	descriptor "google.golang.org/protobuf/types/descriptorpb"
+	"google.golang.org/protobuf/types/pluginpb"
+
+	gqlpb "go.unistack.org/micro-proto/v3/graphql"
+)
+
+func GraphqlMethodOptions(opts proto.Message) *gqlpb.Rpc {
+	if opts != nil {
+		v := proto.GetExtension(opts, gqlpb.E_Rpc)
+		if v != nil {
+			return v.(*gqlpb.Rpc)
+		}
+	}
+	return nil
+}
+
+func GraphqlServiceOptions(opts proto.Message) *gqlpb.Svc {
+	if opts != nil {
+		v := proto.GetExtension(opts, gqlpb.E_Svc)
+		if v != nil {
+			return v.(*gqlpb.Svc)
+		}
+	}
+	return nil
+}
+
+func GraphqlFieldOptions(opts proto.Message) *gqlpb.Field {
+	if opts != nil {
+		v := proto.GetExtension(opts, gqlpb.E_Field)
+		if v != nil && v.(*gqlpb.Field) != nil {
+			return v.(*gqlpb.Field)
+		}
+	}
+	return nil
+}
+
+func GraphqlOneofOptions(opts proto.Message) *gqlpb.Oneof {
+	if opts != nil {
+		v := proto.GetExtension(opts, gqlpb.E_Oneof)
+		if v != nil && v.(*gqlpb.Oneof) != nil {
+			return v.(*gqlpb.Oneof)
+		}
+	}
+	return nil
+}
+
+// GoCamelCase camel-cases a protobuf name for use as a Go identifier.
+//
+// If there is an interior underscore followed by a lower case letter,
+// drop the underscore and convert the letter to upper case.
+func GoCamelCase(s string) string {
+	// Invariant: if the next letter is lower case, it must be converted
+	// to upper case.
+	// That is, we process a word at a time, where words are marked by _ or
+	// upper case letter. Digits are treated as words.
+	var b []byte
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		switch {
+		case c == '.' && i+1 < len(s) && isASCIILower(s[i+1]):
+			// Skip over '.' in ".{{lowercase}}".
+		case c == '.':
+			b = append(b, '_') // convert '.' to '_'
+		case c == '_' && (i == 0 || s[i-1] == '.'):
+			// Convert initial '_' to ensure we start with a capital letter.
+			// Do the same for '_' after '.' to match historic behavior.
+			b = append(b, 'X') // convert '_' to 'X'
+		case c == '_' && i+1 < len(s) && isASCIILower(s[i+1]):
+			// Skip over '_' in "_{{lowercase}}".
+		case isASCIIDigit(c):
+			b = append(b, c)
+		default:
+			// Assume we have a letter now - if not, it's a bogus identifier.
+			// The next word is a sequence of characters that must start upper case.
+			if isASCIILower(c) {
+				c -= 'a' - 'A' // convert lowercase to uppercase
+			}
+			b = append(b, c)
+
+			// Accept lower case sequence that follows.
+			for ; i+1 < len(s) && isASCIILower(s[i+1]); i++ {
+				b = append(b, s[i+1])
+			}
+		}
+	}
+	return string(b)
+}
+
+func GetRequestType(rpcOpts *gqlpb.Rpc, svcOpts *gqlpb.Svc) gqlpb.Type {
+	if rpcOpts != nil && rpcOpts.Type != nil {
+		return *rpcOpts.Type
+	}
+	if svcOpts != nil && svcOpts.Type != nil {
+		return *svcOpts.Type
+	}
+	return gqlpb.Type_DEFAULT
+}
+
+func CreateDescriptorsFromProto(req *pluginpb.CodeGeneratorRequest) (descs []*desc.FileDescriptor, err error) {
+	dd, err := desc.CreateFileDescriptorsFromSet(&descriptor.FileDescriptorSet{
+		File: req.GetProtoFile(),
+	})
+	if err != nil {
+		return nil, err
+	}
+	for _, d := range dd {
+		for _, filename := range req.FileToGenerate {
+			if filename == d.GetName() {
+				descs = append(descs, d)
+			}
+		}
+	}
+	return
+}
+
+func ResolveProtoFilesRecursively(descs []*desc.FileDescriptor) (files FileDescriptors) {
+	for _, f := range descs {
+		files = append(files, ResolveProtoFilesRecursively(f.GetDependencies())...)
+		files = append(files, f)
+	}
+
+	return files
+}
+
+type FileDescriptors []*desc.FileDescriptor
+
+func (ds FileDescriptors) AsFileDescriptorProto() (files []*descriptor.FileDescriptorProto) {
+	for _, d := range ds {
+		files = append(files, d.AsFileDescriptorProto())
+	}
+	return
+}
+
+// Split splits the camelcase word and returns a list of words. It also
+// supports digits. Both lower camel case and upper camel case are supported.
+// For more info please check: http://en.wikipedia.org/wiki/CamelCase
+//
+// Examples
+//
+//	"" =>                     [""]
+//	"lowercase" =>            ["lowercase"]
+//	"Class" =>                ["Class"]
+//	"MyClass" =>              ["My", "Class"]
+//	"MyC" =>                  ["My", "C"]
+//	"HTML" =>                 ["HTML"]
+//	"PDFLoader" =>            ["PDF", "Loader"]
+//	"AString" =>              ["A", "String"]
+//	"SimpleXMLParser" =>      ["Simple", "XML", "Parser"]
+//	"vimRPCPlugin" =>         ["vim", "RPC", "Plugin"]
+//	"GL11Version" =>          ["GL", "11", "Version"]
+//	"99Bottles" =>            ["99", "Bottles"]
+//	"May5" =>                 ["May", "5"]
+//	"BFG9000" =>              ["BFG", "9000"]
+//	"BöseÜberraschung" =>     ["Böse", "Überraschung"]
+//	"Two  spaces" =>          ["Two", "  ", "spaces"]
+//	"BadUTF8\xe2\xe2\xa1" =>  ["BadUTF8\xe2\xe2\xa1"]
+//
+// Splitting rules
+//
+//  1. If string is not valid UTF-8, return it without splitting as
+//     single item array.
+//  2. Assign all unicode characters into one of 4 sets: lower case
+//     letters, upper case letters, numbers, and all other characters.
+//  3. Iterate through characters of string, introducing splits
+//     between adjacent characters that belong to different sets.
+//  4. Iterate through array of split strings, and if a given string
+//     is upper case:
+//     if subsequent string is lower case:
+//     move last character of upper case string to beginning of
+//     lower case string
+func SplitCamelCase(src string) (entries []string) {
+	// don't split invalid utf8
+	if !utf8.ValidString(src) {
+		return []string{src}
+	}
+	entries = []string{}
+	var runes [][]rune
+	lastClass := 0
+	class := 0
+	// split into fields based on class of unicode character
+	for _, r := range src {
+		switch true {
+		case unicode.IsLower(r):
+			class = 1
+		case unicode.IsUpper(r):
+			class = 2
+		case unicode.IsDigit(r):
+			class = 3
+		default:
+			class = 4
+		}
+		if class == lastClass {
+			runes[len(runes)-1] = append(runes[len(runes)-1], r)
+		} else {
+			runes = append(runes, []rune{r})
+		}
+		lastClass = class
+	}
+	// handle upper case -> lower case sequences, e.g.
+	// "PDFL", "oader" -> "PDF", "Loader"
+	for i := 0; i < len(runes)-1; i++ {
+		if unicode.IsUpper(runes[i][0]) && unicode.IsLower(runes[i+1][0]) {
+			runes[i+1] = append([]rune{runes[i][len(runes[i])-1]}, runes[i+1]...)
+			runes[i] = runes[i][:len(runes[i])-1]
+		}
+	}
+	// construct []string from results
+	for _, s := range runes {
+		if len(s) > 0 {
+			entries = append(entries, string(s))
+		}
+	}
+	return
+}
+
+// CamelCase returns the CamelCased name.
+// If there is an interior underscore followed by a lower case letter,
+// drop the underscore and convert the letter to upper case.
+// There is a remote possibility of this rewrite causing a name collision,
+// but it's so remote we're prepared to pretend it's nonexistent - since the
+// C++ generator lowercases names, it's extremely unlikely to have two fields
+// with different capitalizations.
+// In short, _my_field_name_2 becomes XMyFieldName_2.
+func CamelCase(s string) string {
+	if s == "" {
+		return ""
+	}
+	t := make([]byte, 0, 32)
+	i := 0
+	if s[0] == '_' {
+		// Need a capital letter; drop the '_'.
+		t = append(t, 'X')
+		i++
+	}
+	// Invariant: if the next letter is lower case, it must be converted
+	// to upper case.
+	// That is, we process a word at a time, where words are marked by _ or
+	// upper case letter. Digits are treated as words.
+	for ; i < len(s); i++ {
+		c := s[i]
+		if c == '_' && i+1 < len(s) && isASCIILower(s[i+1]) {
+			continue // Skip the underscore in s.
+		}
+		if isASCIIDigit(c) {
+			t = append(t, c)
+			continue
+		}
+		// Assume we have a letter now - if not, it's a bogus identifier.
+		// The next word is a sequence of characters that must start upper case.
+		if isASCIILower(c) {
+			c ^= ' ' // Make it a capital letter.
+		}
+		t = append(t, c) // Guaranteed not lower case.
+		// Accept lower case sequence that follows.
+		for i+1 < len(s) && isASCIILower(s[i+1]) {
+			i++
+			t = append(t, s[i])
+		}
+	}
+	return string(t)
+}
+
+// CamelCaseSlice is like CamelCase, but the argument is a slice of strings to
+// be joined with "_".
+func CamelCaseSlice(elem []string) string { return CamelCase(strings.Join(elem, "_")) }
+
+// Is c an ASCII lower-case letter?
+func isASCIILower(c byte) bool {
+	return 'a' <= c && c <= 'z'
+}
+
+// Is c an ASCII digit?
+func isASCIIDigit(c byte) bool {
+	return '0' <= c && c <= '9'
+}
+
+func ToLowerFirst(s string) string {
+	if len(s) > 0 {
+		return string(unicode.ToLower(rune(s[0]))) + s[1:]
+	}
+	return ""
+}

graphqls.go

@@ -3,12 +3,9 @@ package main
 import (
 	"bytes"
 	"os"
-	"path"
-	"path/filepath"
-	"strings"
 
-	"github.com/danielvladco/go-proto-gql/pkg/generator"
 	"github.com/vektah/gqlparser/v2/formatter"
+	generator "go.unistack.org/protoc-gen-go-micro/v3/graphql"
 	"google.golang.org/protobuf/compiler/protogen"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/pluginpb"
@@ -20,7 +17,7 @@ func (g *Generator) graphqlsGenerate(plugin *protogen.Plugin) error {
 		return err
 	}
 
-	gqlDesc, err := generator.NewSchemas(descs, true, true, plugin)
+	gqlDesc, err := generator.NewSchemas(descs, false, false, plugin)
 	if err != nil {
 		return err
 	}
@@ -30,10 +27,9 @@ func (g *Generator) graphqlsGenerate(plugin *protogen.Plugin) error {
 	for _, schema := range gqlDesc {
 		buf := &bytes.Buffer{}
 		formatter.NewFormatter(buf).FormatSchema(schema.AsGraphql())
-		protoFileName := schema.FileDescriptors[0].GetName()
 
 		outFiles = append(outFiles, &pluginpb.CodeGeneratorResponse_File{
-			Name:    proto.String(resolveGraphqlFilename(protoFileName)),
+			Name:    proto.String(g.graphqlFile),
 			Content: proto.String(buf.String()),
 		})
 	}
@@ -58,16 +54,3 @@ func (g *Generator) graphqlsGenerate(plugin *protogen.Plugin) error {
 
 	return nil
 }
-
-func resolveGraphqlFilename(protoFileName string) string {
-	gqlFileName := "schema." + "graphqls"
-	absProtoFileName, err := filepath.Abs(protoFileName)
-	if err == nil {
-		protoDirSlice := strings.Split(filepath.Dir(absProtoFileName), string(filepath.Separator))
-		if len(protoDirSlice) > 0 {
-			gqlFileName = protoDirSlice[len(protoDirSlice)-1] + "." + "graphqls"
-		}
-	}
-	protoDir, _ := path.Split(protoFileName)
-	return path.Join(protoDir, gqlFileName)
-}

main.go

@@ -18,7 +18,7 @@ var (
 	flagComponents    = flagSet.String("components", "micro|rpc|http|client|server|openapiv3|graphql", "specify components to generate")
 	flagTagPath       = flagSet.String("tag_path", "", "tag rewriting dir")
 	flagOpenapiFile   = flagSet.String("openapi_file", "apidocs.swagger.yaml", "openapi file name")
-	flagGraphqlFile   = flagSet.String("openapi_file", "schema.graphqls", "graphql file name")
+	flagGraphqlFile   = flagSet.String("graphql_file", "schema.graphqls", "graphql file name")
 	flagReflection    = flagSet.Bool("reflection", false, "enable server reflection support")
 	flagHelp          = flagSet.Bool("help", false, "display help message")
 )
@@ -47,6 +47,7 @@ type Generator struct {
 	fieldaligment bool
 	tagPath       string
 	openapiFile   string
+	graphqlFile   string
 	reflection    bool
 	plugin        *protogen.Plugin
 }
@@ -61,6 +62,7 @@ func (g *Generator) Generate(plugin *protogen.Plugin) error {
 	g.fieldaligment = *flagFieldaligment
 	g.tagPath = *flagTagPath
 	g.openapiFile = *flagOpenapiFile
+	g.graphqlFile = *flagGraphqlFile
 	g.reflection = *flagReflection
 	plugin.SupportedFeatures = uint64(pluginpb.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL)
 
@@ -106,6 +108,8 @@ func (g *Generator) Generate(plugin *protogen.Plugin) error {
 			err = g.openapiv3Generate(plugin)
 		case "graphqls":
 			err = g.graphqlsGenerate(plugin)
+		case "graphql":
+			err = g.graphqlGenerate(plugin)
 		case "none":
 			break
 		default:

tools.go

@@ -0,0 +1,7 @@
+//go:build ignore
+
+package tools
+
+import (
+	_ "go.unistack.org/micro-proto/v3/graphql"
+)