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eth: Round up bumped gas price for the replacement transactions #2126

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Dec 7, 2021
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eth: Round up bumped gas price for the replacement transactions #2126

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26a1483
eth: Round up bumped gas price for the replacement transactions
leszko Dec 7, 2021
d00c850
Update CHANGELOG_PENDING.md
leszko Dec 7, 2021
6bda31f
Update CHANGELOG_PENDING.md
leszko Dec 7, 2021
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1 change: 1 addition & 0 deletions CHANGELOG_PENDING.md
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@

- \#2114 Add option to repeat the benchmarking process (@jailuthra)
- \#2111 Ensure `maxFeePerGas` in all transactions never exceed `-masGasPrice` defined by the user (@leszko)
- \#2126 Round up bumped gas price for the replacement transactions (@leszko)

#### Broadcaster

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3 changes: 2 additions & 1 deletion eth/transactionManager.go
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Expand Up @@ -252,7 +252,8 @@ func (tm *TransactionManager) newAdjustedTx(tx *types.Transaction) *types.Transa
func applyPriceBump(val *big.Int, priceBump uint64) *big.Int {
a := big.NewInt(100 + int64(priceBump))
b := new(big.Int).Mul(a, val)
return b.Div(b, big.NewInt(100))
// div round up
return b.Div(new(big.Int).Add(b, big.NewInt(99)), big.NewInt(100))
}

func newReplacementTx(tx *types.Transaction) *types.Transaction {
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12 changes: 9 additions & 3 deletions eth/transactionManager_test.go
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Expand Up @@ -380,10 +380,16 @@ func TestApplyPriceBump(t *testing.T) {
res = applyPriceBump(big.NewInt(500), 101)
assert.Equal(big.NewInt(1005), res)

// Test round down when result is not a whole number
// 50 * 1.11 = 55.5 -> 55
// Tests round up when result is not a whole number
// 50 * 1.11 = 55.5 -> 56
res = applyPriceBump(big.NewInt(50), 11)
assert.Equal(big.NewInt(55), res)
assert.Equal(big.NewInt(56), res)
// 501 * 1.11 = 556.11 -> 557
res = applyPriceBump(big.NewInt(501), 11)
assert.Equal(big.NewInt(557), res)
// 9 * 1.11 = 9.99 -> 10
res = applyPriceBump(big.NewInt(9), 11)
assert.Equal(big.NewInt(10), res)
}

func TestNewReplacementTx(t *testing.T) {
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