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state: optimize NEP17Balance deserialization

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```
BenchmarkNEP17BalanceFromBytes/stackitem-8         	 2402318	       503.3 ns/op	     208 B/op	      10 allocs/op
BenchmarkNEP17BalanceFromBytes/from_bytes-8        	 7623139	       160.7 ns/op	      72 B/op	       3 allocs/op
```

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Evgeniy Stratonikov 2021-08-04 11:39:45 +03:00
parent 3218b74ea5
commit b210a34b1e
2 changed files with 63 additions and 5 deletions
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23
pkg/core/state/native_state.go
View file

@ -25,12 +25,25 @@ type NEOBalance struct {
// NEP17BalanceFromBytes converts serialized NEP17Balance to structure.
func NEP17BalanceFromBytes(b []byte) (*NEP17Balance, error) {
balance := new(NEP17Balance)
err := balanceFromBytes(b, balance)
if err != nil {
return nil, err
if len(b) < 4 {
if len(b) == 0 {
return new(NEP17Balance), nil
}
return nil, errors.New("invalid format")
}
return balance, nil
if b[0] != byte(stackitem.StructT) {
return nil, errors.New("not a struct")
}
if b[1] != 1 {
return nil, errors.New("invalid item count")
}
if st := stackitem.Type(b[2]); st != stackitem.IntegerT {
return nil, fmt.Errorf("invalid balance: %s", st)
}
if int(b[3]) != len(b[4:]) {
return nil, errors.New("invalid balance format")
}
return &NEP17Balance{Balance: *bigint.FromBytes(b[4:])}, nil
}
// Bytes returns serialized NEP17Balance.

45
pkg/core/state/native_state_test.go
View file

@ -20,6 +20,31 @@ func TestNEP17Balance_Bytes(t *testing.T) {
ret := b.Bytes(buf[:0])
require.Equal(t, ret, buf[:len(ret)])
})
actual, err := NEP17BalanceFromBytes(data)
require.NoError(t, err)
require.Equal(t, &b, actual)
}
func TestNEP17BalanceFromBytesInvalid(t *testing.T) {
b, err := NEP17BalanceFromBytes(nil) // 0 is ok
require.NoError(t, err)
require.Equal(t, int64(0), b.Balance.Int64())
_, err = NEP17BalanceFromBytes([]byte{byte(stackitem.StructT)})
require.Error(t, err)
_, err = NEP17BalanceFromBytes([]byte{byte(stackitem.IntegerT), 4, 0, 1, 2, 3})
require.Error(t, err)
_, err = NEP17BalanceFromBytes([]byte{byte(stackitem.StructT), 0, byte(stackitem.IntegerT), 1, 1})
require.Error(t, err)
_, err = NEP17BalanceFromBytes([]byte{byte(stackitem.StructT), 1, byte(stackitem.ByteArrayT), 1, 1})
require.Error(t, err)
_, err = NEP17BalanceFromBytes([]byte{byte(stackitem.StructT), 1, byte(stackitem.IntegerT), 2, 1})
require.Error(t, err)
}
func BenchmarkNEP17BalanceBytes(b *testing.B) {
@ -48,3 +73,23 @@ func BenchmarkNEP17BalanceBytes(b *testing.B) {
}
})
}
func BenchmarkNEP17BalanceFromBytes(b *testing.B) {
var bl NEP17Balance
bl.Balance.SetInt64(0x12345678910)
buf := bl.Bytes(nil)
b.Run("stackitem", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
_ = stackitem.DeserializeConvertible(buf, new(NEP17Balance))
}
})
b.Run("from bytes", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
_, _ = NEP17BalanceFromBytes(buf)
}
})
}