5 files changed, 54 insertions, 4 deletions

diff --git a/src/0x.js.ts b/src/0x.js.ts
index a95bc3384..c799e63e9 100644
--- a/src/0x.js.ts
+++ b/src/0x.js.ts
@@ -70,10 +70,10 @@ export class ZeroEx {
         return salt;
     }
     /** Checks if order hash is valid */
-    public static isValidOrderHash(orderHash: string): boolean {
-        assert.isString('orderHash', orderHash);
-        const isValid = /^0x[0-9A-F]{64}$/i.test(orderHash);
-        return isValid;
+    public static isValidOrderHash(orderHashHex: string): boolean {
+        assert.isString('orderHashHex', orderHashHex);
+        const isValidOrderHash = utils.isValidOrderHash(orderHashHex);
+        return isValidOrderHash;
     }
     /**
      * A unit amount is defined as the amount of a token above the specified decimal places (integer part).
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index dc2c95d4e..0822ef875 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -1,4 +1,5 @@
 import * as _ from 'lodash';
+import * as BigNumber from 'bignumber.js';
 import {Web3Wrapper} from '../web3_wrapper';
 import {
     ECSignature,
@@ -61,6 +62,38 @@ export class ExchangeWrapper extends ContractWrapper {
         return isValidSignature;
     }
     /**
+     * Returns the unavailable takerAmount of an order. Unavailable amount is defined as the total
+     * amount that has been filled or cancelled. The remaining takerAmount can be calculated by
+     * subtracting the unavailable amount from the total order takerAmount.
+     */
+    public async getUnavailableTakerAmountAsync(orderHashHex: string): Promise<BigNumber.BigNumber> {
+        assert.isValidOrderHash('orderHashHex', orderHashHex);
+
+        const exchangeContract = await this.getExchangeContractAsync();
+        const unavailableAmountInBaseUnits = await exchangeContract.getUnavailableValueT.call(orderHashHex);
+        return unavailableAmountInBaseUnits;
+    }
+    /**
+     * Retrieve the takerAmount of an order that has already been filled.
+     */
+    public async getFilledTakerAmountAsync(orderHashHex: string): Promise<BigNumber.BigNumber> {
+        assert.isValidOrderHash('orderHashHex', orderHashHex);
+
+        const exchangeContract = await this.getExchangeContractAsync();
+        const fillAmountInBaseUnits = await exchangeContract.filled.call(orderHashHex);
+        return fillAmountInBaseUnits;
+    }
+    /**
+     * Retrieve the takerAmount of an order that has been cancelled.
+     */
+    public async getCanceledTakerAmountAsync(orderHashHex: string): Promise<BigNumber.BigNumber> {
+        assert.isValidOrderHash('orderHashHex', orderHashHex);
+
+        const exchangeContract = await this.getExchangeContractAsync();
+        const cancelledAmountInBaseUnits = await exchangeContract.cancelled.call(orderHashHex);
+        return cancelledAmountInBaseUnits;
+    }
+    /**
      * Fills a signed order with a fillAmount denominated in baseUnits of the taker token. The caller can
      * decide whether they want the call to throw if the balance/allowance checks fail by setting
      * shouldCheckTransfer to false. If set to true, the call will fail without throwing, preserving gas costs.
diff --git a/src/types.ts b/src/types.ts
index ad5d8fb17..2686c140a 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -34,12 +34,21 @@ export type OrderValues = [BigNumber.BigNumber, BigNumber.BigNumber, BigNumber.B
 
 export interface ExchangeContract {
     isValidSignature: any;
+    getUnavailableValueT: {
+        call: (orderHash: string) => BigNumber.BigNumber;
+    };
     fill: {
         (orderAddresses: OrderAddresses, orderValues: OrderValues, fillAmount: BigNumber.BigNumber,
          shouldCheckTransfer: boolean, v: number, r: string, s: string, txOpts: TxOpts): ContractResponse;
         estimateGas: (orderAddresses: OrderAddresses, orderValues: OrderValues, fillAmount: BigNumber.BigNumber,
                       shouldCheckTransfer: boolean, v: number, r: string, s: string, txOpts: TxOpts) => number;
     };
+    filled: {
+        call: (orderHash: string) => BigNumber.BigNumber;
+    };
+    cancelled: {
+        call: (orderHash: string) => BigNumber.BigNumber;
+    };
 }
 
 export interface TokenContract {
diff --git a/src/utils/assert.ts b/src/utils/assert.ts
index aeed1c6dc..406f2b149 100644
--- a/src/utils/assert.ts
+++ b/src/utils/assert.ts
@@ -2,6 +2,7 @@ import * as _ from 'lodash';
 import * as BigNumber from 'bignumber.js';
 import * as Web3 from 'web3';
 import {SchemaValidator} from './schema_validator';
+import {utils} from './utils';
 
 const HEX_REGEX = /^0x[0-9A-F]*$/i;
 
@@ -27,6 +28,9 @@ export const assert = {
     isNumber(variableName: string, value: number): void {
         this.assert(_.isFinite(value), this.typeAssertionMessage(variableName, 'number', value));
     },
+    isValidOrderHash(variableName: string, value: string): void {
+        this.assert(utils.isValidOrderHash(value), this.typeAssertionMessage(variableName, 'orderHash', value));
+    },
     isBoolean(variableName: string, value: boolean): void {
         this.assert(_.isBoolean(value), this.typeAssertionMessage(variableName, 'boolean', value));
     },
diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index 336eaf7bb..e6840a624 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -18,4 +18,8 @@ export const utils = {
     isParityNode(nodeVersion: string): boolean {
         return _.includes(nodeVersion, 'Parity');
     },
+    isValidOrderHash(orderHashHex: string) {
+        const isValid = /^0x[0-9A-F]{64}$/i.test(orderHashHex);
+        return isValid;
+    },
 };