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chaindump: microoptimize memory management

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Reuse buffers.

Signed-off-by: Roman Khimov <roman@nspcc.ru>
This commit is contained in:
Roman Khimov 2024-07-16 15:03:00 +03:00
parent d9d9d00775
commit 1aefd7d16a
1 changed files with 10 additions and 2 deletions
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12
pkg/core/chaindump/dump.go
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@ -20,13 +20,14 @@ type DumperRestorer interface {
// Dump writes count blocks from start to the provided writer. // Dump writes count blocks from start to the provided writer.
// Note: header needs to be written separately by a client. // Note: header needs to be written separately by a client.
func Dump(bc DumperRestorer, w *io.BinWriter, start, count uint32) error { func Dump(bc DumperRestorer, w *io.BinWriter, start, count uint32) error {
var buf = io.NewBufBinWriter()
for i := start; i < start+count; i++ { for i := start; i < start+count; i++ {
bh := bc.GetHeaderHash(i) bh := bc.GetHeaderHash(i)
b, err := bc.GetBlock(bh) b, err := bc.GetBlock(bh)
if err != nil { if err != nil {
return err return err
} }
buf := io.NewBufBinWriter()
b.EncodeBinary(buf.BinWriter) b.EncodeBinary(buf.BinWriter)
bytes := buf.Bytes() bytes := buf.Bytes()
w.WriteU32LE(uint32(len(bytes))) w.WriteU32LE(uint32(len(bytes)))
@ -34,6 +35,7 @@ func Dump(bc DumperRestorer, w *io.BinWriter, start, count uint32) error {
if w.Err != nil { if w.Err != nil {
return w.Err return w.Err
} }
buf.Reset()
} }
return nil return nil
} }
@ -41,9 +43,15 @@ func Dump(bc DumperRestorer, w *io.BinWriter, start, count uint32) error {
// Restore restores blocks from the provided reader. // Restore restores blocks from the provided reader.
// f is called after addition of every block. // 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 { func Restore(bc DumperRestorer, r *io.BinReader, skip, count uint32, f func(b *block.Block) error) error {
var buf []byte
readBlock := func(r *io.BinReader) ([]byte, error) { readBlock := func(r *io.BinReader) ([]byte, error) {
var size = r.ReadU32LE() var size = r.ReadU32LE()
buf := make([]byte, size) if uint32(cap(buf)) < size {
buf = make([]byte, size)
} else {
buf = buf[:size]
}
r.ReadBytes(buf) r.ReadBytes(buf)
return buf, r.Err return buf, r.Err
} }