frostfs-node/pkg/services/accounting/morph/executor.go
Alex Vanin d08c1c76c1 [] Reduce precision from balance contract to Fixed8.
Fixed8 won't overflow int64 for values less than 92 billion
that is suitable for GAS.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>
2020-10-29 10:14:59 +03:00

51 lines
1.4 KiB
Go

package accounting
import (
"context"
"github.com/nspcc-dev/neofs-api-go/pkg/owner"
"github.com/nspcc-dev/neofs-api-go/v2/accounting"
"github.com/nspcc-dev/neofs-node/pkg/morph/client/balance/wrapper"
accountingSvc "github.com/nspcc-dev/neofs-node/pkg/services/accounting"
"github.com/nspcc-dev/neofs-node/pkg/util/precision"
)
type morphExecutor struct {
client *wrapper.Wrapper
}
const fixed8Precision = 8
func NewExecutor(client *wrapper.Wrapper) accountingSvc.ServiceExecutor {
return &morphExecutor{
client: client,
}
}
func (s *morphExecutor) Balance(ctx context.Context, body *accounting.BalanceRequestBody) (*accounting.BalanceResponseBody, error) {
amount, err := s.client.BalanceOf(owner.NewIDFromV2(body.GetOwnerID()))
if err != nil {
return nil, err
}
balancePrecision, err := s.client.Decimals()
if err != nil {
return nil, err
}
// Convert amount to Fixed8 precision. This way it will definitely fit
// int64 value.
// Max Fixed8 decimal integer value that fit into int64: 92 233 720 368.
// Max Fixed12 decimal integer value that fit into int64: 9 223 372.
// Max Fixed16 decimal integer value that fit into int64: 922.
fixed8Amount := precision.Convert(balancePrecision, fixed8Precision, amount)
dec := new(accounting.Decimal)
dec.SetValue(fixed8Amount.Int64())
dec.SetPrecision(fixed8Precision)
res := new(accounting.BalanceResponseBody)
res.SetBalance(dec)
return res, nil
}