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block: Grow buffer on Trim, avoid reallocations

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This commit is contained in:
Roman Khimov 2021-08-20 11:05:46 +03:00
parent b8dd284d3d
commit abc48229a3
1 changed files with 3 additions and 1 deletions
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4
pkg/core/block/block.go
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@ -107,9 +107,11 @@ func New(stateRootEnabled bool) *Block {
// Notice that only the hashes of the transactions are stored.
func (b *Block) Trim() ([]byte, error) {
buf := io.NewBufBinWriter()
numTx := len(b.Transactions)
buf.Grow(b.GetExpectedBlockSizeWithoutTransactions(numTx) + util.Uint256Size*numTx)
b.Header.EncodeBinary(buf.BinWriter)
buf.WriteVarUint(uint64(len(b.Transactions)))
buf.WriteVarUint(uint64(numTx))
for _, tx := range b.Transactions {
h := tx.Hash()
h.EncodeBinary(buf.BinWriter)