3 files changed, 24 insertions, 23 deletions
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index fec75e6df..f67a125aa 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -18,7 +18,7 @@ import {
     CreateContractEvent,
     ContractEventObj,
     EventCallback,
-    ContractResponse,
+    ContractResponse, OrderCancellationRequest,
 } from '../types';
 import {assert} from '../utils/assert';
 import {utils} from '../utils/utils';
@@ -208,29 +208,31 @@ export class ExchangeWrapper extends ContractWrapper {
     /**
      * Batch version of cancelOrderAsync. Atomically cancels multiple orders in a single transaction.
      */
-    public async batchCancelOrderAsync(
-        orders: Array<Order|SignedOrder>, takerTokenCancelAmounts: BigNumber.BigNumber[]): Promise<void> {
-        const makers = _.map(orders, order => order.maker);
-        assert.isSameLength('orders', orders, 'takerTokenCancelAmounts', takerTokenCancelAmounts);
-        assert.assert(!_.isEmpty(orders), 'Can not cancel an empty batch');
+    public async batchCancelOrderAsync(cancellationRequestsBatch: OrderCancellationRequest[]): Promise<void> {
+        const makers = _.map(cancellationRequestsBatch, cancellationRequest => cancellationRequest.order.maker);
+        assert.assert(!_.isEmpty(cancellationRequestsBatch), 'Can not cancel an empty batch');
         assert.assert(_.uniq(makers).length === 1, 'Can not cancel orders from multiple makers in a single batch');
         const maker = makers[0];
-        // _.zip doesn't type check if values have different types :'(
-        const ordersAndTakerTokenCancelAmounts = _.zip<any>(orders, takerTokenCancelAmounts);
-        _.forEach(ordersAndTakerTokenCancelAmounts,
-            async ([order, takerTokenCancelAmount]: [Order|SignedOrder, BigNumber.BigNumber]) => {
+        _.forEach(cancellationRequestsBatch,
+            async (cancellationRequest: OrderCancellationRequest) => {
             assert.doesConformToSchema('order',
-                SchemaValidator.convertToJSONSchemaCompatibleObject(order as object), orderSchema);
-            assert.isBigNumber('takerTokenCancelAmount', takerTokenCancelAmount);
-            await assert.isSenderAddressAvailableAsync(this.web3Wrapper, 'order.maker', order.maker);
-            await this.validateCancelOrderAndThrowIfInvalidAsync(order, takerTokenCancelAmount);
+                SchemaValidator.convertToJSONSchemaCompatibleObject(cancellationRequest.order as object), orderSchema);
+            assert.isBigNumber('takerTokenCancelAmount', cancellationRequest.takerTokenCancelAmount);
+            await assert.isSenderAddressAvailableAsync(this.web3Wrapper, 'order.maker',
+                cancellationRequest.order.maker);
+            await this.validateCancelOrderAndThrowIfInvalidAsync(
+                cancellationRequest.order, cancellationRequest.takerTokenCancelAmount);
         });
         const exchangeInstance = await this.getExchangeContractAsync();
-        const orderAddressesAndValues = _.map(orders, order => {
-            return ExchangeWrapper.getOrderAddressesAndValues(order);
+        const orderAddressesValuesAndTakerTokenCancelAmounts = _.map(cancellationRequestsBatch, cancellationRequest => {
+            return [
+                ...ExchangeWrapper.getOrderAddressesAndValues(cancellationRequest.order),
+                cancellationRequest.takerTokenCancelAmount,
+            ];
         });
         // _.unzip doesn't type check if values have different types :'(
-        const [orderAddresses, orderValues] = _.unzip<any>(orderAddressesAndValues);
+        const [orderAddresses, orderValues, takerTokenCancelAmounts] =
+            _.unzip<any>(orderAddressesValuesAndTakerTokenCancelAmounts);
         const gas = await exchangeInstance.batchCancel.estimateGas(
             orderAddresses,
             orderValues,
diff --git a/src/types.ts b/src/types.ts
index 6c217fe51..1034893a4 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -222,3 +222,8 @@ export interface SubscriptionOpts {
 }
 
 export type DoneCallback = (err?: Error) => void;
+
+export interface OrderCancellationRequest {
+    order: Order|SignedOrder;
+    takerTokenCancelAmount: BigNumber.BigNumber;
+}
diff --git a/src/utils/assert.ts b/src/utils/assert.ts
index 61b7527e6..4dc6945a2 100644
--- a/src/utils/assert.ts
+++ b/src/utils/assert.ts
@@ -42,12 +42,6 @@ export const assert = {
         const availableAddresses = await web3Wrapper.getAvailableAddressesAsync();
         this.assert(!_.isEmpty(availableAddresses), 'No addresses were available on the provided web3 instance');
     },
-    isSameLength(variableName1: string, value1: any[], variableName2: string, value2: any[]) {
-        const length1 = value1.length;
-        const length2 = value2.length;
-        this.assert(length1 === length2, `${variableName1} and ${variableName2} length mismatch. \
-${length1} != ${length2}`);
-    },
     isNumber(variableName: string, value: number): void {
         this.assert(_.isFinite(value), this.typeAssertionMessage(variableName, 'number', value));
     },