2 files changed, 36 insertions, 29 deletions
diff --git a/packages/order-utils/src/order_state_utils.ts b/packages/order-utils/src/order_state_utils.ts
index 7974d5d0b..18fc18bf6 100644
--- a/packages/order-utils/src/order_state_utils.ts
+++ b/packages/order-utils/src/order_state_utils.ts
@@ -25,6 +25,14 @@ interface SidedOrderRelevantState {
     remainingFillableAssetAmount: BigNumber;
     isOrderCancelled: boolean;
 }
+interface OrderValidResult {
+    isValid: true;
+}
+interface OrderInvalidResult {
+    isValid: false;
+    error: ExchangeContractErrs;
+}
+type OrderValidationResult = OrderValidResult | OrderInvalidResult;
 
 export class OrderStateUtils {
     private readonly _balanceAndProxyAllowanceFetcher: AbstractBalanceAndProxyAllowanceFetcher;
@@ -32,46 +40,42 @@ export class OrderStateUtils {
     private static _validateIfOrderIsValid(
         signedOrder: SignedOrder,
         sidedOrderRelevantState: SidedOrderRelevantState,
-    ): void {
+    ): OrderValidationResult {
         const isMakerSide = sidedOrderRelevantState.isMakerSide;
         if (sidedOrderRelevantState.isOrderCancelled) {
-            throw new Error(ExchangeContractErrs.OrderAlreadyCancelledOrFilled);
+            return { isValid: false, error: ExchangeContractErrs.OrderCancelled };
         }
         const availableTakerAssetAmount = signedOrder.takerAssetAmount.minus(
             sidedOrderRelevantState.filledTakerAssetAmount,
         );
         if (availableTakerAssetAmount.eq(0)) {
-            throw new Error(ExchangeContractErrs.OrderRemainingFillAmountZero);
+            return { isValid: false, error: ExchangeContractErrs.OrderRemainingFillAmountZero };
         }
 
         if (sidedOrderRelevantState.traderBalance.eq(0)) {
-            throw new Error(
-                isMakerSide
-                    ? ExchangeContractErrs.InsufficientMakerBalance
-                    : ExchangeContractErrs.InsufficientTakerBalance,
-            );
+            const error = isMakerSide
+                ? ExchangeContractErrs.InsufficientMakerBalance
+                : ExchangeContractErrs.InsufficientTakerBalance;
+            return { isValid: false, error };
         }
         if (sidedOrderRelevantState.traderProxyAllowance.eq(0)) {
-            throw new Error(
-                isMakerSide
-                    ? ExchangeContractErrs.InsufficientMakerAllowance
-                    : ExchangeContractErrs.InsufficientTakerAllowance,
-            );
+            const error = isMakerSide
+                ? ExchangeContractErrs.InsufficientMakerAllowance
+                : ExchangeContractErrs.InsufficientTakerAllowance;
+            return { isValid: false, error };
         }
         if (!signedOrder.makerFee.eq(0)) {
             if (sidedOrderRelevantState.traderFeeBalance.eq(0)) {
-                throw new Error(
-                    isMakerSide
-                        ? ExchangeContractErrs.InsufficientMakerFeeBalance
-                        : ExchangeContractErrs.InsufficientTakerFeeBalance,
-                );
+                const error = isMakerSide
+                    ? ExchangeContractErrs.InsufficientMakerFeeBalance
+                    : ExchangeContractErrs.InsufficientTakerFeeBalance;
+                return { isValid: false, error };
             }
             if (sidedOrderRelevantState.traderFeeProxyAllowance.eq(0)) {
-                throw new Error(
-                    isMakerSide
-                        ? ExchangeContractErrs.InsufficientMakerFeeAllowance
-                        : ExchangeContractErrs.InsufficientTakerFeeAllowance,
-                );
+                const error = isMakerSide
+                    ? ExchangeContractErrs.InsufficientMakerFeeAllowance
+                    : ExchangeContractErrs.InsufficientTakerFeeAllowance;
+                return { isValid: false, error };
             }
         }
         const remainingTakerAssetAmount = signedOrder.takerAssetAmount.minus(
@@ -83,8 +87,9 @@ export class OrderStateUtils {
             signedOrder.makerAssetAmount,
         );
         if (isRoundingError) {
-            throw new Error(ExchangeContractErrs.OrderFillRoundingError);
+            return { isValid: false, error: ExchangeContractErrs.OrderFillRoundingError };
         }
+        return { isValid: true };
     }
     constructor(
         balanceAndProxyAllowanceFetcher: AbstractBalanceAndProxyAllowanceFetcher,
@@ -107,19 +112,19 @@ export class OrderStateUtils {
             remainingFillableAssetAmount: orderRelevantState.remainingFillableMakerAssetAmount,
             isOrderCancelled,
         };
-        try {
-            OrderStateUtils._validateIfOrderIsValid(signedOrder, sidedOrderRelevantState);
+        const orderValidationResult = OrderStateUtils._validateIfOrderIsValid(signedOrder, sidedOrderRelevantState);
+        if (orderValidationResult.isValid) {
             const orderState: OrderStateValid = {
                 isValid: true,
                 orderHash,
                 orderRelevantState,
             };
             return orderState;
-        } catch (err) {
+        } else {
             const orderState: OrderStateInvalid = {
                 isValid: false,
                 orderHash,
-                error: err.message,
+                error: orderValidationResult.error,
             };
             return orderState;
         }
diff --git a/packages/order-utils/test/order_state_utils_test.ts b/packages/order-utils/test/order_state_utils_test.ts
index 9292c40a4..91ef23b69 100644
--- a/packages/order-utils/test/order_state_utils_test.ts
+++ b/packages/order-utils/test/order_state_utils_test.ts
@@ -2,7 +2,9 @@ import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import 'mocha';
 
-import { AbstractBalanceAndProxyAllowanceFetcher, AbstractOrderFilledCancelledFetcher, OrderStateUtils } from '../src';
+import { AbstractBalanceAndProxyAllowanceFetcher } from '../src/abstract/abstract_balance_and_proxy_allowance_fetcher';
+import { AbstractOrderFilledCancelledFetcher } from '../src/abstract/abstract_order_filled_cancelled_fetcher';
+import { OrderStateUtils } from '../src/order_state_utils';
 
 import { chaiSetup } from './utils/chai_setup';
 import { testOrderFactory } from './utils/test_order_factory';