add block header download api to grpc

api/service/syncing/downloader/client.go

@@ -44,7 +44,7 @@ func (client *Client) Close() {
 func (client *Client) GetBlockHashes(startHash []byte, size uint32, ip, port string) *pb.DownloaderResponse {
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()
-	request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_HEADER, BlockHash: startHash, Size: size}
+	request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_BLOCKHASH, BlockHash: startHash, Size: size}
 	request.Ip = ip
 	request.Port = port
 	response, err := client.dlClient.Query(ctx, request)
@@ -54,6 +54,23 @@ func (client *Client) GetBlockHashes(startHash []byte, size uint32, ip, port str
 	return response
 }
 
+// GetBlockHeaders gets block headers in serialization byte array by calling a grpc request.
+func (client *Client) GetBlockHeaders(hashes [][]byte) *pb.DownloaderResponse {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_BLOCKHEADER}
+	request.Hashes = make([][]byte, len(hashes))
+	for i := range hashes {
+		request.Hashes[i] = make([]byte, len(hashes[i]))
+		copy(request.Hashes[i], hashes[i])
+	}
+	response, err := client.dlClient.Query(ctx, request)
+	if err != nil {
+		utils.Logger().Error().Err(err).Str("target", client.conn.Target()).Msg("[SYNC] downloader/client.go:GetBlockHeaders query failed")
+	}
+	return response
+}
+
 // GetBlocks gets blocks in serialization byte array by calling a grpc request.
 func (client *Client) GetBlocks(hashes [][]byte) *pb.DownloaderResponse {
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)

api/service/syncing/downloader/gen.sh

@@ -1 +1,2 @@
-protoc -I proto/ proto/downloader.proto --go_out=plugins=grpc:proto
+SRC_DIR=$(dirname $0)
+protoc -I ${SRC_DIR}/proto/ ${SRC_DIR}/proto/downloader.proto --go_out=plugins=grpc:${SRC_DIR}/proto

api/service/syncing/downloader/proto/downloader.pb.go

@@ -8,6 +8,8 @@ import (
 	fmt "fmt"
 	proto "github.com/golang/protobuf/proto"
 	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
 	math "math"
 )
 
@@ -25,33 +27,36 @@ const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
 type DownloaderRequest_RequestType int32
 
 const (
-	DownloaderRequest_HEADER          DownloaderRequest_RequestType = 0
+	DownloaderRequest_BLOCKHASH       DownloaderRequest_RequestType = 0
 	DownloaderRequest_BLOCK           DownloaderRequest_RequestType = 1
 	DownloaderRequest_NEWBLOCK        DownloaderRequest_RequestType = 2
 	DownloaderRequest_BLOCKHEIGHT     DownloaderRequest_RequestType = 3
 	DownloaderRequest_REGISTER        DownloaderRequest_RequestType = 4
 	DownloaderRequest_REGISTERTIMEOUT DownloaderRequest_RequestType = 5
 	DownloaderRequest_UNKNOWN         DownloaderRequest_RequestType = 6
+	DownloaderRequest_BLOCKHEADER     DownloaderRequest_RequestType = 7
 )
 
 var DownloaderRequest_RequestType_name = map[int32]string{
-	0: "HEADER",
+	0: "BLOCKHASH",
 	1: "BLOCK",
 	2: "NEWBLOCK",
 	3: "BLOCKHEIGHT",
 	4: "REGISTER",
 	5: "REGISTERTIMEOUT",
 	6: "UNKNOWN",
+	7: "BLOCKHEADER",
 }
 
 var DownloaderRequest_RequestType_value = map[string]int32{
-	"HEADER":          0,
+	"BLOCKHASH":       0,
 	"BLOCK":           1,
 	"NEWBLOCK":        2,
 	"BLOCKHEIGHT":     3,
 	"REGISTER":        4,
 	"REGISTERTIMEOUT": 5,
 	"UNKNOWN":         6,
+	"BLOCKHEADER":     7,
 }
 
 func (x DownloaderRequest_RequestType) String() string {
@@ -135,7 +140,7 @@ func (m *DownloaderRequest) GetType() DownloaderRequest_RequestType {
 	if m != nil {
 		return m.Type
 	}
-	return DownloaderRequest_HEADER
+	return DownloaderRequest_BLOCKHASH
 }
 
 func (m *DownloaderRequest) GetHashes() [][]byte {
@@ -248,32 +253,33 @@ func init() {
 func init() { proto.RegisterFile("downloader.proto", fileDescriptor_6a99ec95c7ab1ff1) }
 
 var fileDescriptor_6a99ec95c7ab1ff1 = []byte{
-	// 399 bytes of a gzipped FileDescriptorProto
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-	0x27, 0x7f, 0x02, 0x00, 0x00, 0xff, 0xff, 0x68, 0xc1, 0xb5, 0x25, 0xa9, 0x02, 0x00, 0x00,
+	// 410 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x7c, 0x52, 0xcd, 0x6e, 0xd3, 0x40,
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+	0x73, 0x98, 0x68, 0x48, 0x09, 0x2e, 0x61, 0x16, 0x07, 0x97, 0x1d, 0x32, 0xf0, 0x08, 0x16, 0x5d,
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+	0x64, 0x8e, 0x5f, 0xed, 0xdf, 0xc6, 0x19, 0x5d, 0x59, 0xfa, 0x54, 0x4f, 0xff, 0x04, 0x00, 0x00,
+	0xff, 0xff, 0x00, 0xaf, 0x33, 0x33, 0xbe, 0x02, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -313,6 +319,14 @@ type DownloaderServer interface {
 	Query(context.Context, *DownloaderRequest) (*DownloaderResponse, error)
 }
 
+// UnimplementedDownloaderServer can be embedded to have forward compatible implementations.
+type UnimplementedDownloaderServer struct {
+}
+
+func (*UnimplementedDownloaderServer) Query(ctx context.Context, req *DownloaderRequest) (*DownloaderResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Query not implemented")
+}
+
 func RegisterDownloaderServer(s *grpc.Server, srv DownloaderServer) {
 	s.RegisterService(&_Downloader_serviceDesc, srv)
 }

api/service/syncing/downloader/proto/downloader.proto

@@ -10,13 +10,14 @@ service Downloader {
 // DownloaderRequest is the generic download request.
 message DownloaderRequest {
   enum RequestType {
-    HEADER = 0;
+    BLOCKHASH = 0;
     BLOCK = 1;
     NEWBLOCK = 2;
     BLOCKHEIGHT = 3;
     REGISTER = 4;
     REGISTERTIMEOUT = 5;
     UNKNOWN = 6;
+    BLOCKHEADER = 7;
   }
 
   // Request type.

node/node_syncing.go

@@ -310,7 +310,7 @@ func (node *Node) SendNewBlockToUnsync() {
 func (node *Node) CalculateResponse(request *downloader_pb.DownloaderRequest, incomingPeer string) (*downloader_pb.DownloaderResponse, error) {
 	response := &downloader_pb.DownloaderResponse{}
 	switch request.Type {
-	case downloader_pb.DownloaderRequest_HEADER:
+	case downloader_pb.DownloaderRequest_BLOCKHASH:
 		if request.BlockHash == nil {
 			return response, fmt.Errorf("[SYNC] GetBlockHashes Request BlockHash is NIL")
 		}
@@ -347,6 +347,21 @@ func (node *Node) CalculateResponse(request *downloader_pb.DownloaderRequest, in
 			response.Payload = append(response.Payload, blockHash[:])
 		}
 
+	case downloader_pb.DownloaderRequest_BLOCKHEADER:
+		for _, bytes := range request.Hashes {
+			var hash common.Hash
+			hash.SetBytes(bytes)
+			blockHeader := node.Blockchain().GetHeaderByHash(hash)
+			if blockHeader == nil {
+				continue
+			}
+			encodedBlockHeader, err := rlp.EncodeToBytes(blockHeader)
+
+			if err == nil {
+				response.Payload = append(response.Payload, encodedBlockHeader)
+			}
+		}
+
 	case downloader_pb.DownloaderRequest_BLOCK:
 		for _, bytes := range request.Hashes {
 			var hash common.Hash