-
Notifications
You must be signed in to change notification settings - Fork 22
/
fee_estimate.go
62 lines (55 loc) · 1.95 KB
/
fee_estimate.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
// Copyright (C) 2023 Gobalsky Labs Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package banking
import (
"code.vegaprotocol.io/vega/core/types"
"code.vegaprotocol.io/vega/libs/num"
)
// EstimateFee returns a transaction fee estimate with potential discount that can be applied to it.
func EstimateFee(
assetQuantum num.Decimal,
maxQuantumAmount num.Decimal,
transferFeeFactor num.Decimal,
amount *num.Uint,
accumulatedDiscount *num.Uint,
from string,
fromAccountType types.AccountType,
to string,
) (fee *num.Uint, discount *num.Uint) {
tFee := calculateFeeForTransfer(assetQuantum, maxQuantumAmount, transferFeeFactor, amount, from, fromAccountType, to)
return calculateDiscount(accumulatedDiscount, tFee)
}
func calculateFeeForTransfer(
assetQuantum num.Decimal,
maxQuantumAmount num.Decimal,
transferFeeFactor num.Decimal,
amount *num.Uint,
from string,
fromAccountType types.AccountType,
to string,
) *num.Uint {
feeAmount := num.UintZero()
// no fee for Vested account
if fromAccountType == types.AccountTypeVestedRewards && from == to {
return feeAmount
}
// now we calculate the fee
// min(transfer amount * transfer.fee.factor, transfer.fee.maxQuantumAmount * quantum)
feeAmount, _ = num.UintFromDecimal(num.MinD(
amount.ToDecimal().Mul(transferFeeFactor),
maxQuantumAmount.Mul(assetQuantum),
))
return feeAmount
}