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Payroll: handle both cases of extra salary being sent to accrued balance #912

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merged 1 commit into from Jul 8, 2019
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Payroll: handle both cases of extra salary being sent to accrued balance #912

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7 changes: 5 additions & 2 deletions future-apps/payroll/contracts/Payroll.sol
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Expand Up @@ -660,11 +660,14 @@ contract Payroll is EtherTokenConstant, IForwarder, IsContract, AragonApp {
// If they're being paid an amount that doesn't match perfectly with the adjusted time
// (up to a seconds' worth of salary), add the second and put the extra remaining salary
// into their accrued salary
uint256 extraSalary = currentSalaryPaid % salary;
// The extra check is to handle the case where someone requested less than one second of their salary
uint256 extraSalary = currentSalaryPaid < salary ? salary - currentSalaryPaid : currentSalaryPaid % salary;
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salary - extraSalary should go to acrued salary in case when currentSalaryPaid > salary

I think the following code should work fine, or am I missing something?

uint256 extraSalary = currentSalaryPaid % salary;
if (extraSalary > 0) {
            timeDiff = timeDiff.add(1);
            employee.accruedSalary = salary - extraSalary;
        }

Examples:

  1. Salary == 10 and you want to get currentSalaryPaid == 21.
    Time difference would be 3. Contract will transfer currentSalaryPaid == 21 and 10 - 21%10 = 9 will go to the accrued salary.
  2. Salary == 10 and you want to get currentSalaryPaid == 1.
    Time difference would be 1. Contract will transfer currentSalaryPaid == 1 and 10 - 1%10 = 9 will go to the accrued salary.

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Yes... this is a good catch. I think the current state doesn't represent the

currentSalaryPaid == 21 and 10 - 21%10 = 9

case correctly; it'd put 1 into the accrued salary instead of 9.

cc @facuspagnuolo may also want to double check this, but your judgement on this simplification seems correct @Corsaire :).

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True, we were close in our first attempt here haha 😅

if (extraSalary > 0) {
timeDiff = timeDiff.add(1);
employee.accruedSalary = salary - currentSalaryPaid;
employee.accruedSalary = extraSalary;
} else if (accruedSalary > 0) {
// We finally need to clear their accrued salary, but as an optimization, we only do
// this if they had a non-zero value before
employee.accruedSalary = 0;
}

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