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transaction: don't allocate new buffer to calculate hash

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We can write directly to hash.Hash.

name               old time/op    new time/op    delta
DecodeBinary-8       2.89µs ± 3%    2.82µs ± 5%     ~     (p=0.052 n=10+10)
DecodeJSON-8         13.0µs ± 1%    12.8µs ± 1%   -1.54%  (p=0.002 n=10+8)
DecodeFromBytes-8    2.37µs ± 1%    2.25µs ± 5%   -5.25%  (p=0.000 n=9+10)

name               old alloc/op   new alloc/op   delta
DecodeBinary-8       1.75kB ± 0%    1.53kB ± 0%  -12.79%  (p=0.000 n=10+10)
DecodeJSON-8         3.49kB ± 0%    3.26kB ± 0%   -6.42%  (p=0.000 n=10+10)
DecodeFromBytes-8    1.37kB ± 0%    1.14kB ± 0%  -16.37%  (p=0.000 n=10+10)

name               old allocs/op  new allocs/op  delta
DecodeBinary-8         26.0 ± 0%      23.0 ± 0%  -11.54%  (p=0.000 n=10+10)
DecodeJSON-8           58.0 ± 0%      55.0 ± 0%   -5.17%  (p=0.000 n=10+10)
DecodeFromBytes-8      18.0 ± 0%      15.0 ± 0%  -16.67%  (p=0.000 n=10+10)
This commit is contained in:
Roman Khimov 2021-08-04 23:43:20 +03:00
parent 6d10cdc2f6
commit 892c9785ad
1 changed files with 7 additions and 5 deletions
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12
pkg/core/transaction/transaction.go
View file

@ -1,6 +1,7 @@
package transaction
import (
"crypto/sha256"
"encoding/json"
"errors"
"fmt"
@ -234,13 +235,14 @@ func (t *Transaction) EncodeHashableFields() ([]byte, error) {
// createHash creates the hash of the transaction.
func (t *Transaction) createHash() error {
buf := io.NewBufBinWriter()
t.encodeHashableFields(buf.BinWriter)
if buf.Err != nil {
return buf.Err
shaHash := sha256.New()
bw := io.NewBinWriterFromIO(shaHash)
t.encodeHashableFields(bw)
if bw.Err != nil {
return bw.Err
}
t.hash = hash.Sha256(buf.Bytes())
shaHash.Sum(t.hash[:0])
return nil
}