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