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-rw-r--r--packages/0x.js/src/order_watcher/remaining_fillable_calculator.ts23
-rw-r--r--packages/0x.js/src/utils/order_state_utils.ts3
2 files changed, 15 insertions, 11 deletions
diff --git a/packages/0x.js/src/order_watcher/remaining_fillable_calculator.ts b/packages/0x.js/src/order_watcher/remaining_fillable_calculator.ts
index fe373eae4..45f60ada3 100644
--- a/packages/0x.js/src/order_watcher/remaining_fillable_calculator.ts
+++ b/packages/0x.js/src/order_watcher/remaining_fillable_calculator.ts
@@ -10,12 +10,12 @@ export class RemainingFillableCalculator {
private _remainingMakerTokenAmount: BigNumber;
private _remainingMakerFeeAmount: BigNumber;
constructor(signedOrder: SignedOrder,
- zrxAddress: string,
+ isMakerTokenZRX: boolean,
transferrableMakerTokenAmount: BigNumber,
transferrableMakerFeeTokenAmount: BigNumber,
remainingMakerTokenAmount: BigNumber) {
this._signedOrder = signedOrder;
- this._isMakerTokenZRX = signedOrder.makerTokenAddress === zrxAddress;
+ this._isMakerTokenZRX = isMakerTokenZRX;
this._transferrableMakerTokenAmount = transferrableMakerTokenAmount;
this._transferrableMakerFeeTokenAmount = transferrableMakerFeeTokenAmount;
this._remainingMakerTokenAmount = remainingMakerTokenAmount;
@@ -51,18 +51,21 @@ export class RemainingFillableCalculator {
private calculatePartiallyFillableMakerTokenAmount(): BigNumber {
const orderToFeeRatio = this._signedOrder.makerTokenAmount.dividedToIntegerBy(this._signedOrder.makerFee);
- const fillableTimesInFeeToken = BigNumber.min(this._transferrableMakerFeeTokenAmount,
- this._remainingMakerFeeAmount);
- let fillableTimesInMakerToken = this._transferrableMakerTokenAmount.dividedToIntegerBy(orderToFeeRatio);
+ // Maximum number of times the Maker can fill the order, given the fees
+ const fillableTimesInFeeTokenUnits = BigNumber.min(this._transferrableMakerFeeTokenAmount,
+ this._remainingMakerFeeAmount);
+ // Maximum number of times the Maker can fill the order, given the Maker Token Balance
+ let fillableTimesInMakerTokenUnits = this._transferrableMakerTokenAmount.dividedToIntegerBy(orderToFeeRatio);
if (this._isMakerTokenZRX) {
- // when zrx == maker token transferrable maker == transfer
const totalZRXTokenPooled = this._transferrableMakerTokenAmount;
- fillableTimesInMakerToken = totalZRXTokenPooled.dividedToIntegerBy(
- orderToFeeRatio.plus(new BigNumber(1)));
+ // The purchasing power here is less as the tokens are taken from the same Pool
+ // For every one number of fills, we have to take an extra ZRX out of the pool
+ fillableTimesInMakerTokenUnits = totalZRXTokenPooled.dividedToIntegerBy(
+ orderToFeeRatio.plus(new BigNumber(1)));
}
- const partiallyFillableMakerTokenAmount = fillableTimesInMakerToken.times(orderToFeeRatio);
- const partiallyFillableFeeTokenAmount = fillableTimesInFeeToken.times(orderToFeeRatio);
+ const partiallyFillableMakerTokenAmount = fillableTimesInMakerTokenUnits.times(orderToFeeRatio);
+ const partiallyFillableFeeTokenAmount = fillableTimesInFeeTokenUnits.times(orderToFeeRatio);
return BigNumber.min(partiallyFillableMakerTokenAmount, partiallyFillableFeeTokenAmount);
}
}
diff --git a/packages/0x.js/src/utils/order_state_utils.ts b/packages/0x.js/src/utils/order_state_utils.ts
index 9ff26a7f1..1d8f02a18 100644
--- a/packages/0x.js/src/utils/order_state_utils.ts
+++ b/packages/0x.js/src/utils/order_state_utils.ts
@@ -82,8 +82,9 @@ export class OrderStateUtils {
const transferrableMakerTokenAmount = BigNumber.min([makerProxyAllowance, makerBalance]);
const transferrableFeeTokenAmount = BigNumber.min([makerFeeProxyAllowance, makerFeeBalance]);
+ const isMakerTokenZRX = signedOrder.makerTokenAddress === zrxTokenAddress;
const remainingFillableCalculator = new RemainingFillableCalculator(signedOrder,
- zrxTokenAddress,
+ isMakerTokenZRX,
transferrableMakerTokenAmount,
transferrableFeeTokenAmount,
remainingMakerTokenAmount);