package chaindump import ( "fmt" "github.com/nspcc-dev/neo-go/pkg/config" "github.com/nspcc-dev/neo-go/pkg/core/block" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/util" ) // DumperRestorer is an interface to get/add blocks from/to. type DumperRestorer interface { AddBlock(block *block.Block) error GetBlock(hash util.Uint256) (*block.Block, error) GetConfig() config.Blockchain GetHeaderHash(uint32) util.Uint256 } // Dump writes count blocks from start to the provided writer. // Note: header needs to be written separately by a client. func Dump(bc DumperRestorer, w *io.BinWriter, start, count uint32) error { for i := start; i < start+count; i++ { bh := bc.GetHeaderHash(i) b, err := bc.GetBlock(bh) if err != nil { return err } buf := io.NewBufBinWriter() b.EncodeBinary(buf.BinWriter) bytes := buf.Bytes() w.WriteU32LE(uint32(len(bytes))) w.WriteBytes(bytes) if w.Err != nil { return w.Err } } return nil } // Restore restores blocks from the provided reader. // f is called after addition of every block. func Restore(bc DumperRestorer, r *io.BinReader, skip, count uint32, f func(b *block.Block) error) error { readBlock := func(r *io.BinReader) ([]byte, error) { var size = r.ReadU32LE() buf := make([]byte, size) r.ReadBytes(buf) return buf, r.Err } i := uint32(0) for ; i < skip; i++ { _, err := readBlock(r) if err != nil { return err } } stateRootInHeader := bc.GetConfig().StateRootInHeader for ; i < skip+count; i++ { buf, err := readBlock(r) if err != nil { return err } b := block.New(stateRootInHeader) r := io.NewBinReaderFromBuf(buf) b.DecodeBinary(r) if r.Err != nil { return r.Err } if b.Index != 0 || i != 0 || skip != 0 { err = bc.AddBlock(b) if err != nil { return fmt.Errorf("failed to add block %d: %w", i, err) } } if f != nil { if err := f(b); err != nil { return err } } } return nil }