[NOD-1151] Update DNSSeeder to use grpc (#903)

* [NOD-1151] Added gRPC server for seeding peers

* [NOD-1151] Fix  branch after rebase

* [NOD-1151] Lint infrastructure/config/config.go

* [NOD-1151] Use Warnf instead of Infof

* [NOD-1151] Check if a.cfg.GRPCSeed is defined

* [NOD-1151] Delete Makefile

- Use go generate instead of Makefile

* [NOD-1151] Panic in case of GRPCSeed and DNSSeed are both defined

* [NOD-1151] Add generate.go file

* [NOD-1151] Allow dnsseed and grpcseed to work together

Co-authored-by: Bogdan Ovsiannikov <takahawkkun@gmail.com>
Co-authored-by: yaroslavr-itd <yaroslav.r@it-dimension.com>
Co-authored-by: Ori Newman <orinewman1@gmail.com>

app/app.go

@@ -173,6 +173,13 @@ func (a *App) maybeSeedFromDNS() {
 				a.addressManager.AddAddresses(addresses, addresses[0], nil)
 			})
 	}
+
+	if a.cfg.GRPCSeed != "" {
+		dnsseed.SeedFromGRPC(a.cfg.NetParams(), a.cfg.GRPCSeed, appmessage.SFNodeNetwork, false, nil,
+			func(addresses []*appmessage.NetAddress) {
+				a.addressManager.AddAddresses(addresses, addresses[0], nil)
+			})
+	}
 }
 func setupDAG(cfg *config.Config, databaseContext *dbaccess.DatabaseContext, interrupt <-chan struct{},
 	sigCache *txscript.SigCache, indexManager blockdag.IndexManager) (*blockdag.BlockDAG, error) {

infrastructure/config/config.go

@@ -106,6 +106,7 @@ type Flags struct {
 	DisableTLS           bool          `long:"notls" description:"Disable TLS for the RPC server -- NOTE: This is only allowed if the RPC server is bound to localhost"`
 	DisableDNSSeed       bool          `long:"nodnsseed" description:"Disable DNS seeding for peers"`
 	DNSSeed              string        `long:"dnsseed" description:"Override DNS seeds with specified hostname (Only 1 hostname allowed)"`
+	GRPCSeed             string        `long:"grpcseed" description:"Hostname of gRPC server for seeding peers"`
 	ExternalIPs          []string      `long:"externalip" description:"Add an ip to the list of local addresses we claim to listen on to peers"`
 	Proxy                string        `long:"proxy" description:"Connect via SOCKS5 proxy (eg. 127.0.0.1:9050)"`
 	ProxyUser            string        `long:"proxyuser" description:"Username for proxy server"`

infrastructure/network/dnsseed/pb/generate.go

@@ -0,0 +1,3 @@
+//go:generate protoc --go_out=. --go-grpc_out=. --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative peer_service.proto
+
+package pb

infrastructure/network/dnsseed/pb/peer_service.pb.go

@@ -0,0 +1,333 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0-devel
+// 	protoc        v3.6.1
+// source: peer_service.proto
+
+package pb
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+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)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type GetPeersListRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ServiceFlag           uint64 `protobuf:"varint,1,opt,name=serviceFlag,proto3" json:"serviceFlag,omitempty"`
+	SubnetworkID          []byte `protobuf:"bytes,2,opt,name=subnetworkID,proto3" json:"subnetworkID,omitempty"`
+	IncludeAllSubnetworks bool   `protobuf:"varint,3,opt,name=includeAllSubnetworks,proto3" json:"includeAllSubnetworks,omitempty"`
+}
+
+func (x *GetPeersListRequest) Reset() {
+	*x = GetPeersListRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_peer_service_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetPeersListRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetPeersListRequest) ProtoMessage() {}
+
+func (x *GetPeersListRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_peer_service_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 mi.MessageOf(x)
+}
+
+// Deprecated: Use GetPeersListRequest.ProtoReflect.Descriptor instead.
+func (*GetPeersListRequest) Descriptor() ([]byte, []int) {
+	return file_peer_service_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *GetPeersListRequest) GetServiceFlag() uint64 {
+	if x != nil {
+		return x.ServiceFlag
+	}
+	return 0
+}
+
+func (x *GetPeersListRequest) GetSubnetworkID() []byte {
+	if x != nil {
+		return x.SubnetworkID
+	}
+	return nil
+}
+
+func (x *GetPeersListRequest) GetIncludeAllSubnetworks() bool {
+	if x != nil {
+		return x.IncludeAllSubnetworks
+	}
+	return false
+}
+
+type GetPeersListResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Addresses []*NetAddress `protobuf:"bytes,1,rep,name=addresses,proto3" json:"addresses,omitempty"`
+}
+
+func (x *GetPeersListResponse) Reset() {
+	*x = GetPeersListResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_peer_service_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetPeersListResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetPeersListResponse) ProtoMessage() {}
+
+func (x *GetPeersListResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_peer_service_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetPeersListResponse.ProtoReflect.Descriptor instead.
+func (*GetPeersListResponse) Descriptor() ([]byte, []int) {
+	return file_peer_service_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *GetPeersListResponse) GetAddresses() []*NetAddress {
+	if x != nil {
+		return x.Addresses
+	}
+	return nil
+}
+
+type NetAddress struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Timestamp int64  `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	Services  uint64 `protobuf:"varint,2,opt,name=services,proto3" json:"services,omitempty"`
+	IP        []byte `protobuf:"bytes,3,opt,name=IP,proto3" json:"IP,omitempty"`
+	Port      uint32 `protobuf:"varint,4,opt,name=port,proto3" json:"port,omitempty"`
+}
+
+func (x *NetAddress) Reset() {
+	*x = NetAddress{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_peer_service_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *NetAddress) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*NetAddress) ProtoMessage() {}
+
+func (x *NetAddress) ProtoReflect() protoreflect.Message {
+	mi := &file_peer_service_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use NetAddress.ProtoReflect.Descriptor instead.
+func (*NetAddress) Descriptor() ([]byte, []int) {
+	return file_peer_service_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *NetAddress) GetTimestamp() int64 {
+	if x != nil {
+		return x.Timestamp
+	}
+	return 0
+}
+
+func (x *NetAddress) GetServices() uint64 {
+	if x != nil {
+		return x.Services
+	}
+	return 0
+}
+
+func (x *NetAddress) GetIP() []byte {
+	if x != nil {
+		return x.IP
+	}
+	return nil
+}
+
+func (x *NetAddress) GetPort() uint32 {
+	if x != nil {
+		return x.Port
+	}
+	return 0
+}
+
+var File_peer_service_proto protoreflect.FileDescriptor
+
+var file_peer_service_proto_rawDesc = []byte{
+	0x0a, 0x12, 0x70, 0x65, 0x65, 0x72, 0x5f, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x2e, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x22, 0x91, 0x01, 0x0a, 0x13, 0x47, 0x65, 0x74, 0x50, 0x65, 0x65, 0x72,
+	0x73, 0x4c, 0x69, 0x73, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x20, 0x0a, 0x0b,
+	0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x46, 0x6c, 0x61, 0x67, 0x18, 0x01, 0x20, 0x01, 0x28,
+	0x04, 0x52, 0x0b, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x46, 0x6c, 0x61, 0x67, 0x12, 0x22,
+	0x0a, 0x0c, 0x73, 0x75, 0x62, 0x6e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x49, 0x44, 0x18, 0x02,
+	0x20, 0x01, 0x28, 0x0c, 0x52, 0x0c, 0x73, 0x75, 0x62, 0x6e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b,
+	0x49, 0x44, 0x12, 0x34, 0x0a, 0x15, 0x69, 0x6e, 0x63, 0x6c, 0x75, 0x64, 0x65, 0x41, 0x6c, 0x6c,
+	0x53, 0x75, 0x62, 0x6e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x73, 0x18, 0x03, 0x20, 0x01, 0x28,
+	0x08, 0x52, 0x15, 0x69, 0x6e, 0x63, 0x6c, 0x75, 0x64, 0x65, 0x41, 0x6c, 0x6c, 0x53, 0x75, 0x62,
+	0x6e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x73, 0x22, 0x41, 0x0a, 0x14, 0x47, 0x65, 0x74, 0x50,
+	0x65, 0x65, 0x72, 0x73, 0x4c, 0x69, 0x73, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
+	0x12, 0x29, 0x0a, 0x09, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x65, 0x73, 0x18, 0x01, 0x20,
+	0x03, 0x28, 0x0b, 0x32, 0x0b, 0x2e, 0x4e, 0x65, 0x74, 0x41, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73,
+	0x52, 0x09, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x65, 0x73, 0x22, 0x6a, 0x0a, 0x0a, 0x4e,
+	0x65, 0x74, 0x41, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x12, 0x1c, 0x0a, 0x09, 0x74, 0x69, 0x6d,
+	0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x18, 0x01, 0x20, 0x01, 0x28, 0x03, 0x52, 0x09, 0x74, 0x69,
+	0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x12, 0x1a, 0x0a, 0x08, 0x73, 0x65, 0x72, 0x76, 0x69,
+	0x63, 0x65, 0x73, 0x18, 0x02, 0x20, 0x01, 0x28, 0x04, 0x52, 0x08, 0x73, 0x65, 0x72, 0x76, 0x69,
+	0x63, 0x65, 0x73, 0x12, 0x0e, 0x0a, 0x02, 0x49, 0x50, 0x18, 0x03, 0x20, 0x01, 0x28, 0x0c, 0x52,
+	0x02, 0x49, 0x50, 0x12, 0x12, 0x0a, 0x04, 0x70, 0x6f, 0x72, 0x74, 0x18, 0x04, 0x20, 0x01, 0x28,
+	0x0d, 0x52, 0x04, 0x70, 0x6f, 0x72, 0x74, 0x32, 0x4c, 0x0a, 0x0b, 0x50, 0x65, 0x65, 0x72, 0x53,
+	0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x12, 0x3d, 0x0a, 0x0c, 0x47, 0x65, 0x74, 0x50, 0x65, 0x65,
+	0x72, 0x73, 0x4c, 0x69, 0x73, 0x74, 0x12, 0x14, 0x2e, 0x47, 0x65, 0x74, 0x50, 0x65, 0x65, 0x72,
+	0x73, 0x4c, 0x69, 0x73, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x15, 0x2e, 0x47,
+	0x65, 0x74, 0x50, 0x65, 0x65, 0x72, 0x73, 0x4c, 0x69, 0x73, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f,
+	0x6e, 0x73, 0x65, 0x22, 0x00, 0x42, 0x1f, 0x5a, 0x1d, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e,
+	0x63, 0x6f, 0x6d, 0x2f, 0x6b, 0x61, 0x73, 0x70, 0x61, 0x6e, 0x65, 0x74, 0x2f, 0x6b, 0x61, 0x73,
+	0x70, 0x61, 0x64, 0x2f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_peer_service_proto_rawDescOnce sync.Once
+	file_peer_service_proto_rawDescData = file_peer_service_proto_rawDesc
+)
+
+func file_peer_service_proto_rawDescGZIP() []byte {
+	file_peer_service_proto_rawDescOnce.Do(func() {
+		file_peer_service_proto_rawDescData = protoimpl.X.CompressGZIP(file_peer_service_proto_rawDescData)
+	})
+	return file_peer_service_proto_rawDescData
+}
+
+var file_peer_service_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_peer_service_proto_goTypes = []interface{}{
+	(*GetPeersListRequest)(nil),  // 0: GetPeersListRequest
+	(*GetPeersListResponse)(nil), // 1: GetPeersListResponse
+	(*NetAddress)(nil),           // 2: NetAddress
+}
+var file_peer_service_proto_depIdxs = []int32{
+	2, // 0: GetPeersListResponse.addresses:type_name -> NetAddress
+	0, // 1: PeerService.GetPeersList:input_type -> GetPeersListRequest
+	1, // 2: PeerService.GetPeersList:output_type -> GetPeersListResponse
+	2, // [2:3] is the sub-list for method output_type
+	1, // [1:2] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_peer_service_proto_init() }
+func file_peer_service_proto_init() {
+	if File_peer_service_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_peer_service_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetPeersListRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_peer_service_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetPeersListResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_peer_service_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*NetAddress); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_peer_service_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   3,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_peer_service_proto_goTypes,
+		DependencyIndexes: file_peer_service_proto_depIdxs,
+		MessageInfos:      file_peer_service_proto_msgTypes,
+	}.Build()
+	File_peer_service_proto = out.File
+	file_peer_service_proto_rawDesc = nil
+	file_peer_service_proto_goTypes = nil
+	file_peer_service_proto_depIdxs = nil
+}

infrastructure/network/dnsseed/pb/peer_service.proto

@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+option go_package = "github.com/kaspanet/kaspad/pb";
+
+service PeerService {
+  rpc GetPeersList(GetPeersListRequest) returns (GetPeersListResponse) {}
+}
+
+message GetPeersListRequest {
+  uint64 serviceFlag = 1;
+  bytes subnetworkID = 2;
+  bool includeAllSubnetworks = 3;
+}
+
+message GetPeersListResponse {
+  repeated NetAddress addresses = 1;
+}
+
+message NetAddress {
+  int64 timestamp = 1;
+  uint64 services = 2;
+  bytes IP = 3;
+  uint32 port = 4;
+}

infrastructure/network/dnsseed/pb/peer_service_grpc.pb.go

@@ -0,0 +1,90 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+
+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.
+const _ = grpc.SupportPackageIsVersion6
+
+// PeerServiceClient is the client API for PeerService 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 PeerServiceClient interface {
+	GetPeersList(ctx context.Context, in *GetPeersListRequest, opts ...grpc.CallOption) (*GetPeersListResponse, error)
+}
+
+type peerServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewPeerServiceClient(cc grpc.ClientConnInterface) PeerServiceClient {
+	return &peerServiceClient{cc}
+}
+
+func (c *peerServiceClient) GetPeersList(ctx context.Context, in *GetPeersListRequest, opts ...grpc.CallOption) (*GetPeersListResponse, error) {
+	out := new(GetPeersListResponse)
+	err := c.cc.Invoke(ctx, "/PeerService/GetPeersList", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// PeerServiceServer is the server API for PeerService service.
+// All implementations must embed UnimplementedPeerServiceServer
+// for forward compatibility
+type PeerServiceServer interface {
+	GetPeersList(context.Context, *GetPeersListRequest) (*GetPeersListResponse, error)
+	mustEmbedUnimplementedPeerServiceServer()
+}
+
+// UnimplementedPeerServiceServer must be embedded to have forward compatible implementations.
+type UnimplementedPeerServiceServer struct {
+}
+
+func (*UnimplementedPeerServiceServer) GetPeersList(context.Context, *GetPeersListRequest) (*GetPeersListResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetPeersList not implemented")
+}
+func (*UnimplementedPeerServiceServer) mustEmbedUnimplementedPeerServiceServer() {}
+
+func RegisterPeerServiceServer(s *grpc.Server, srv PeerServiceServer) {
+	s.RegisterService(&_PeerService_serviceDesc, srv)
+}
+
+func _PeerService_GetPeersList_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetPeersListRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(PeerServiceServer).GetPeersList(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/PeerService/GetPeersList",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(PeerServiceServer).GetPeersList(ctx, req.(*GetPeersListRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _PeerService_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "PeerService",
+	HandlerType: (*PeerServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GetPeersList",
+			Handler:    _PeerService_GetPeersList_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "peer_service.proto",
+}

infrastructure/network/dnsseed/seed.go

@@ -5,13 +5,17 @@
 package dnsseed
 
 import (
+	"context"
 	"fmt"
-	"github.com/kaspanet/kaspad/app/appmessage"
 	"math/rand"
 	"net"
 	"strconv"
 	"time"
 
+	"github.com/kaspanet/kaspad/app/appmessage"
+	pb2 "github.com/kaspanet/kaspad/infrastructure/network/dnsseed/pb"
+	"google.golang.org/grpc"
+
 	"github.com/kaspanet/kaspad/util/mstime"
 
 	"github.com/kaspanet/kaspad/util/subnetworkid"
@@ -97,3 +101,71 @@ func SeedFromDNS(dagParams *dagconfig.Params, customSeed string, reqServices app
 		})
 	}
 }
+
+// SeedFromGRPC send gRPC request to get list of peers for a given host
+func SeedFromGRPC(dagParams *dagconfig.Params, host string, reqServices appmessage.ServiceFlag, includeAllSubnetworks bool,
+	subnetworkID *subnetworkid.SubnetworkID, seedFn OnSeed) {
+
+	spawn("SeedFromGRPC", func() {
+
+		randSource := rand.New(rand.NewSource(time.Now().UnixNano()))
+
+		conn, err := grpc.Dial(host, grpc.WithInsecure())
+		client := pb2.NewPeerServiceClient(conn)
+		if err != nil {
+			log.Warnf("Failed to connect to gRPC server: %s", host)
+		}
+
+		var subnetID []byte
+		if subnetworkID != nil {
+			subnetID = subnetworkID.CloneBytes()
+		} else {
+			subnetID = nil
+		}
+
+		req := &pb2.GetPeersListRequest{
+			ServiceFlag:           uint64(reqServices),
+			SubnetworkID:          subnetID,
+			IncludeAllSubnetworks: includeAllSubnetworks,
+		}
+		res, err := client.GetPeersList(context.Background(), req)
+
+		if err != nil {
+			log.Infof("gRPC request to get peers failed (host=%s): %s", host, err)
+			return
+		}
+
+		seedPeers := fromProtobufAddresses(res.Addresses)
+
+		numPeers := len(seedPeers)
+
+		log.Infof("%d addresses found from DNS seed %s", numPeers, host)
+
+		if numPeers == 0 {
+			return
+		}
+		addresses := make([]*appmessage.NetAddress, len(seedPeers))
+		// if this errors then we have *real* problems
+		intPort, _ := strconv.Atoi(dagParams.DefaultPort)
+		for i, peer := range seedPeers {
+			addresses[i] = appmessage.NewNetAddressTimestamp(
+				// seed with addresses from a time randomly selected
+				// between 3 and 7 days ago.
+				mstime.Now().Add(-1*time.Second*time.Duration(secondsIn3Days+
+					randSource.Int31n(secondsIn4Days))),
+				0, peer, uint16(intPort))
+		}
+
+		seedFn(addresses)
+	})
+}
+
+func fromProtobufAddresses(proto []*pb2.NetAddress) []net.IP {
+	var addresses []net.IP
+
+	for _, pbAddr := range proto {
+		addresses = append(addresses, net.IP(pbAddr.IP))
+	}
+
+	return addresses
+}