Update to use the latest protobuf package to build pb (#5193)

* Update to use the latest protobuf package to build pb

The pb package was generated some time ago with old version
of https://github.com/golang/protobuf which was deprecated
and in favor of google.golang.org/protobuf (see
deprecation notice in https://pkg.go.dev/github.com/golang/protobuf)

This PR updates the generation of pb package with
v1.27.1 of google.golang.org/protobuf.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Exclude pb from import test

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

6 files changed, 229 insertions, 121 deletions

diff --git a/core/dnsserver/server_grpc.go b/core/dnsserver/server_grpc.go
index d5726e8a6..766c27e36 100644
--- a/core/dnsserver/server_grpc.go
+++ b/core/dnsserver/server_grpc.go
@@ -22,6 +22,7 @@ import (
 // ServergRPC represents an instance of a DNS-over-gRPC server.
 type ServergRPC struct {
 	*Server
+	*pb.UnimplementedDnsServiceServer
 	grpcServer *grpc.Server
 	listenAddr net.Addr
 	tlsConfig  *tls.Config
diff --git a/pb/Makefile b/pb/Makefile
index a666d6c15..7e8cdaf26 100644
--- a/pb/Makefile
+++ b/pb/Makefile
@@ -2,11 +2,18 @@
 # from: https://github.com/golang/protobuf to make this work.
 # The generate dns.pb.go is checked into git, so for normal builds we don't need
 # to run this generation step.
+# Note: The following has been used when regenerate pb:
+#  curl -OL https://github.com/protocolbuffers/protobuf/releases/download/v3.19.4/protoc-3.19.4-linux-x86_64.zip
+#  go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.27.1
+#  go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.2.0
+#  export PATH="$PATH:$(go env GOPATH)/bin"
+#  rm pb/dns.pb.go pb/dns_grpc.pb.go
+#  make pb
 
 all: dns.pb.go
 
 dns.pb.go: dns.proto
-	protoc --go_out=plugins=grpc:. dns.proto
+	protoc --go_out=. --go-grpc_out=. dns.proto
 
 .PHONY: clean
 clean:
diff --git a/pb/dns.pb.go b/pb/dns.pb.go
index 919f0e7d7..e2a311cc1 100644
--- a/pb/dns.pb.go
+++ b/pb/dns.pb.go
@@ -1,156 +1,147 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.27.1
+// 	protoc        v3.19.4
 // source: dns.proto
 
 package pb
 
 import (
-	context "context"
-	fmt "fmt"
-	math "math"
-
-	proto "github.com/golang/protobuf/proto"
-	grpc "google.golang.org/grpc"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
 )
 
-// Reference imports to suppress errors if they are not otherwise used.
-var _ = proto.Marshal
-var _ = fmt.Errorf
-var _ = math.Inf
-
-/* Miek: disabled this manually, because I don't know what the heck */
-/*
-// This is a compile-time assertion to ensure that this generated file
-// is compatible with the proto package it is being compiled against.
-// A compilation error at this line likely means your copy of the
-// proto package needs to be updated.
-const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
-*/
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
 
 type DnsPacket struct {
-	Msg                  []byte   `protobuf:"bytes,1,opt,name=msg,proto3" json:"msg,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
-}
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
 
-func (m *DnsPacket) Reset()         { *m = DnsPacket{} }
-func (m *DnsPacket) String() string { return proto.CompactTextString(m) }
-func (*DnsPacket) ProtoMessage()    {}
-func (*DnsPacket) Descriptor() ([]byte, []int) {
-	return fileDescriptor_638ff8d8aaf3d8ae, []int{0}
+	Msg []byte `protobuf:"bytes,1,opt,name=msg,proto3" json:"msg,omitempty"`
 }
 
-func (m *DnsPacket) XXX_Unmarshal(b []byte) error {
-	return xxx_messageInfo_DnsPacket.Unmarshal(m, b)
-}
-func (m *DnsPacket) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
-	return xxx_messageInfo_DnsPacket.Marshal(b, m, deterministic)
-}
-func (m *DnsPacket) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_DnsPacket.Merge(m, src)
-}
-func (m *DnsPacket) XXX_Size() int {
-	return xxx_messageInfo_DnsPacket.Size(m)
+func (x *DnsPacket) Reset() {
+	*x = DnsPacket{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_dns_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
 }
-func (m *DnsPacket) XXX_DiscardUnknown() {
-	xxx_messageInfo_DnsPacket.DiscardUnknown(m)
+
+func (x *DnsPacket) String() string {
+	return protoimpl.X.MessageStringOf(x)
 }
 
-var xxx_messageInfo_DnsPacket proto.InternalMessageInfo
+func (*DnsPacket) ProtoMessage() {}
 
-func (m *DnsPacket) GetMsg() []byte {
-	if m != nil {
-		return m.Msg
+func (x *DnsPacket) ProtoReflect() protoreflect.Message {
+	mi := &file_dns_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
 	}
-	return nil
+	return mi.MessageOf(x)
 }
 
-func init() {
-	proto.RegisterType((*DnsPacket)(nil), "coredns.dns.DnsPacket")
+// Deprecated: Use DnsPacket.ProtoReflect.Descriptor instead.
+func (*DnsPacket) Descriptor() ([]byte, []int) {
+	return file_dns_proto_rawDescGZIP(), []int{0}
 }
 
-func init() { proto.RegisterFile("dns.proto", fileDescriptor_638ff8d8aaf3d8ae) }
-
-var fileDescriptor_638ff8d8aaf3d8ae = []byte{
-	// 120 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0xe2, 0x4c, 0xc9, 0x2b, 0xd6,
-	0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0xe2, 0x4e, 0xce, 0x2f, 0x4a, 0x05, 0x71, 0x53, 0xf2, 0x8a,
-	0x95, 0x64, 0xb9, 0x38, 0x5d, 0xf2, 0x8a, 0x03, 0x12, 0x93, 0xb3, 0x53, 0x4b, 0x84, 0x04, 0xb8,
-	0x98, 0x73, 0x8b, 0xd3, 0x25, 0x18, 0x15, 0x18, 0x35, 0x78, 0x82, 0x40, 0x4c, 0x23, 0x57, 0x2e,
-	0x2e, 0x97, 0xbc, 0xe2, 0xe0, 0xd4, 0xa2, 0xb2, 0xcc, 0xe4, 0x54, 0x21, 0x73, 0x2e, 0xd6, 0xc0,
-	0xd2, 0xd4, 0xa2, 0x4a, 0x21, 0x31, 0x3d, 0x24, 0x33, 0xf4, 0xe0, 0x06, 0x48, 0xe1, 0x10, 0x77,
-	0x62, 0x89, 0x62, 0x2a, 0x48, 0x4a, 0x62, 0x03, 0xdb, 0x6f, 0x0c, 0x08, 0x00, 0x00, 0xff, 0xff,
-	0xf5, 0xd1, 0x3f, 0x26, 0x8c, 0x00, 0x00, 0x00,
+func (x *DnsPacket) GetMsg() []byte {
+	if x != nil {
+		return x.Msg
+	}
+	return nil
 }
 
-// Reference imports to suppress errors if they are not otherwise used.
-var _ context.Context
-var _ grpc.ClientConn
-
-// This is a compile-time assertion to ensure that this generated file
-// is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion4
-
-// DnsServiceClient is the client API for DnsService service.
-//
-// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
-type DnsServiceClient interface {
-	Query(ctx context.Context, in *DnsPacket, opts ...grpc.CallOption) (*DnsPacket, error)
-}
+var File_dns_proto protoreflect.FileDescriptor
 
-type dnsServiceClient struct {
-	cc *grpc.ClientConn
+var file_dns_proto_rawDesc = []byte{
+	0x0a, 0x09, 0x64, 0x6e, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0b, 0x63, 0x6f, 0x72,
+	0x65, 0x64, 0x6e, 0x73, 0x2e, 0x64, 0x6e, 0x73, 0x22, 0x1d, 0x0a, 0x09, 0x44, 0x6e, 0x73, 0x50,
+	0x61, 0x63, 0x6b, 0x65, 0x74, 0x12, 0x10, 0x0a, 0x03, 0x6d, 0x73, 0x67, 0x18, 0x01, 0x20, 0x01,
+	0x28, 0x0c, 0x52, 0x03, 0x6d, 0x73, 0x67, 0x32, 0x45, 0x0a, 0x0a, 0x44, 0x6e, 0x73, 0x53, 0x65,
+	0x72, 0x76, 0x69, 0x63, 0x65, 0x12, 0x37, 0x0a, 0x05, 0x51, 0x75, 0x65, 0x72, 0x79, 0x12, 0x16,
+	0x2e, 0x63, 0x6f, 0x72, 0x65, 0x64, 0x6e, 0x73, 0x2e, 0x64, 0x6e, 0x73, 0x2e, 0x44, 0x6e, 0x73,
+	0x50, 0x61, 0x63, 0x6b, 0x65, 0x74, 0x1a, 0x16, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x64, 0x6e, 0x73,
+	0x2e, 0x64, 0x6e, 0x73, 0x2e, 0x44, 0x6e, 0x73, 0x50, 0x61, 0x63, 0x6b, 0x65, 0x74, 0x42, 0x06,
+	0x5a, 0x04, 0x2e, 0x3b, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
-func NewDnsServiceClient(cc *grpc.ClientConn) DnsServiceClient {
-	return &dnsServiceClient{cc}
-}
+var (
+	file_dns_proto_rawDescOnce sync.Once
+	file_dns_proto_rawDescData = file_dns_proto_rawDesc
+)
 
-func (c *dnsServiceClient) Query(ctx context.Context, in *DnsPacket, opts ...grpc.CallOption) (*DnsPacket, error) {
-	out := new(DnsPacket)
-	err := c.cc.Invoke(ctx, "/coredns.dns.DnsService/Query", in, out, opts...)
-	if err != nil {
-		return nil, err
-	}
-	return out, nil
+func file_dns_proto_rawDescGZIP() []byte {
+	file_dns_proto_rawDescOnce.Do(func() {
+		file_dns_proto_rawDescData = protoimpl.X.CompressGZIP(file_dns_proto_rawDescData)
+	})
+	return file_dns_proto_rawDescData
 }
 
-// DnsServiceServer is the server API for DnsService service.
-type DnsServiceServer interface {
-	Query(context.Context, *DnsPacket) (*DnsPacket, error)
+var file_dns_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_dns_proto_goTypes = []interface{}{
+	(*DnsPacket)(nil), // 0: coredns.dns.DnsPacket
 }
-
-func RegisterDnsServiceServer(s *grpc.Server, srv DnsServiceServer) {
-	s.RegisterService(&_DnsService_serviceDesc, srv)
+var file_dns_proto_depIdxs = []int32{
+	0, // 0: coredns.dns.DnsService.Query:input_type -> coredns.dns.DnsPacket
+	0, // 1: coredns.dns.DnsService.Query:output_type -> coredns.dns.DnsPacket
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
 }
 
-func _DnsService_Query_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(DnsPacket)
-	if err := dec(in); err != nil {
-		return nil, err
-	}
-	if interceptor == nil {
-		return srv.(DnsServiceServer).Query(ctx, in)
+func init() { file_dns_proto_init() }
+func file_dns_proto_init() {
+	if File_dns_proto != nil {
+		return
 	}
-	info := &grpc.UnaryServerInfo{
-		Server:     srv,
-		FullMethod: "/coredns.dns.DnsService/Query",
+	if !protoimpl.UnsafeEnabled {
+		file_dns_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DnsPacket); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
-	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(DnsServiceServer).Query(ctx, req.(*DnsPacket))
-	}
-	return interceptor(ctx, in, info, handler)
-}
-
-var _DnsService_serviceDesc = grpc.ServiceDesc{
-	ServiceName: "coredns.dns.DnsService",
-	HandlerType: (*DnsServiceServer)(nil),
-	Methods: []grpc.MethodDesc{
-		{
-			MethodName: "Query",
-			Handler:    _DnsService_Query_Handler,
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_dns_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   1,
 		},
-	},
-	Streams:  []grpc.StreamDesc{},
-	Metadata: "dns.proto",
+		GoTypes:           file_dns_proto_goTypes,
+		DependencyIndexes: file_dns_proto_depIdxs,
+		MessageInfos:      file_dns_proto_msgTypes,
+	}.Build()
+	File_dns_proto = out.File
+	file_dns_proto_rawDesc = nil
+	file_dns_proto_goTypes = nil
+	file_dns_proto_depIdxs = nil
 }
diff --git a/pb/dns.proto b/pb/dns.proto
index 8461f01e6..ee24cb0bb 100644
--- a/pb/dns.proto
+++ b/pb/dns.proto
@@ -1,7 +1,7 @@
 syntax = "proto3";
 
 package coredns.dns;
-option go_package = "pb";
+option go_package = ".;pb";
 
 message DnsPacket {
 	bytes msg = 1;
diff --git a/pb/dns_grpc.pb.go b/pb/dns_grpc.pb.go
new file mode 100644
index 000000000..6ff3faf11
--- /dev/null
+++ b/pb/dns_grpc.pb.go
@@ -0,0 +1,105 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.19.4
+// source: dns.proto
+
+package pb
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// DnsServiceClient is the client API for DnsService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type DnsServiceClient interface {
+	Query(ctx context.Context, in *DnsPacket, opts ...grpc.CallOption) (*DnsPacket, error)
+}
+
+type dnsServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewDnsServiceClient(cc grpc.ClientConnInterface) DnsServiceClient {
+	return &dnsServiceClient{cc}
+}
+
+func (c *dnsServiceClient) Query(ctx context.Context, in *DnsPacket, opts ...grpc.CallOption) (*DnsPacket, error) {
+	out := new(DnsPacket)
+	err := c.cc.Invoke(ctx, "/coredns.dns.DnsService/Query", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// DnsServiceServer is the server API for DnsService service.
+// All implementations must embed UnimplementedDnsServiceServer
+// for forward compatibility
+type DnsServiceServer interface {
+	Query(context.Context, *DnsPacket) (*DnsPacket, error)
+	mustEmbedUnimplementedDnsServiceServer()
+}
+
+// UnimplementedDnsServiceServer must be embedded to have forward compatible implementations.
+type UnimplementedDnsServiceServer struct {
+}
+
+func (UnimplementedDnsServiceServer) Query(context.Context, *DnsPacket) (*DnsPacket, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Query not implemented")
+}
+func (UnimplementedDnsServiceServer) mustEmbedUnimplementedDnsServiceServer() {}
+
+// UnsafeDnsServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to DnsServiceServer will
+// result in compilation errors.
+type UnsafeDnsServiceServer interface {
+	mustEmbedUnimplementedDnsServiceServer()
+}
+
+func RegisterDnsServiceServer(s grpc.ServiceRegistrar, srv DnsServiceServer) {
+	s.RegisterService(&DnsService_ServiceDesc, srv)
+}
+
+func _DnsService_Query_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(DnsPacket)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DnsServiceServer).Query(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/coredns.dns.DnsService/Query",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DnsServiceServer).Query(ctx, req.(*DnsPacket))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// DnsService_ServiceDesc is the grpc.ServiceDesc for DnsService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var DnsService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "coredns.dns.DnsService",
+	HandlerType: (*DnsServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Query",
+			Handler:    _DnsService_Query_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "dns.proto",
+}
diff --git a/test/presubmit_test.go b/test/presubmit_test.go
index 903661ba0..b94beb31b 100644
--- a/test/presubmit_test.go
+++ b/test/presubmit_test.go
@@ -250,6 +250,10 @@ func (w *testImportOrderingWalker) walk(path string, info os.FileInfo, _ error)
 	if filepath.Ext(path) != ".go" {
 		return nil
 	}
+	// pb files are autogenerated by protoc
+	if strings.HasPrefix(path, "../pb/") {
+		return nil
+	}
 
 	fs := token.NewFileSet()
 	f, err := parser.ParseFile(fs, path, nil, parser.AllErrors)