package downloader import ( "context" "fmt" "time" pb "github.com/harmony-one/harmony/api/service/syncing/downloader/proto" "github.com/harmony-one/harmony/internal/utils" "google.golang.org/grpc" ) // Client is the client model for downloader package. type Client struct { dlClient pb.DownloaderClient opts []grpc.DialOption conn *grpc.ClientConn } // ClientSetup setups a Client given ip and port. func ClientSetup(ip, port string) *Client { client := Client{} client.opts = append(client.opts, grpc.WithInsecure()) var err error client.conn, err = grpc.Dial(fmt.Sprintf(ip+":"+port), client.opts...) if err != nil { utils.GetLogInstance().Info("client.go:ClientSetup fail to dial: ", "error", err) return nil } client.dlClient = pb.NewDownloaderClient(client.conn) return &client } // Close closes the Client. func (client *Client) Close() { err := client.conn.Close() if err != nil { utils.GetLogInstance().Info("unable to close connection ") } } // GetBlockHashes gets block hashes from all the peers by calling grpc request. func (client *Client) GetBlockHashes(startHash []byte) *pb.DownloaderResponse { ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) defer cancel() request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_HEADER, BlockHash: startHash} response, err := client.dlClient.Query(ctx, request) if err != nil { utils.GetLogInstance().Info("[SYNC] GetBlockHashes query failed", "error", err) } 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) defer cancel() request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_BLOCK} 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.GetLogInstance().Info("[SYNC] downloader/client.go:GetBlocks query failed.", "error", err) } return response } // Register will register node's ip/port information to peers receive newly created blocks in future // hash is the bytes of "ip:port" string representation func (client *Client) Register(hash []byte, ip, port string) *pb.DownloaderResponse { ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second) defer cancel() request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_REGISTER} request.PeerHash = make([]byte, len(hash)) copy(request.PeerHash, hash) request.Ip = ip request.Port = port response, err := client.dlClient.Query(ctx, request) if err != nil || response == nil { utils.GetLogInstance().Info("[SYNC] client.go:Register failed.", "error", err, "response", response) } return response } // PushNewBlock will send the lastest verified block to registered nodes func (client *Client) PushNewBlock(selfPeerHash [20]byte, blockHash []byte, timeout bool) *pb.DownloaderResponse { ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) defer cancel() request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_NEWBLOCK} request.BlockHash = make([]byte, len(blockHash)) copy(request.BlockHash, blockHash) request.PeerHash = make([]byte, len(selfPeerHash)) copy(request.PeerHash, selfPeerHash[:]) if timeout { request.Type = pb.DownloaderRequest_REGISTERTIMEOUT } response, err := client.dlClient.Query(ctx, request) if err != nil { utils.GetLogInstance().Info("[SYNC] unable to send new block to unsync node", "error", err) } return response } // GetBlockChainHeight gets the blockheight from peer func (client *Client) GetBlockChainHeight() *pb.DownloaderResponse { ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) defer cancel() request := &pb.DownloaderRequest{Type: pb.DownloaderRequest_BLOCKHEIGHT} response, err := client.dlClient.Query(ctx, request) if err != nil { utils.GetLogInstance().Info("[SYNC] unable to get blockchain height", "error", err) } return response }