Merge pull request #106 from 0xProject/single-exchange

Single exchange

10 files changed, 67 insertions, 199 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 413203e4c..6675dedfb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,8 +2,7 @@
 
 v0.9.0 - TBD
 ------------------------
-    * Move `zeroEx.exchange.getAvailableContractAddressesAsync` to `zeroEx.getAvailableExchangeContractAddressesAsync` (#94)
-    * Move `zeroEx.exchange.getProxyAuthorizedContractAddressesAsync` to `zeroEx.getProxyAuthorizedExchangeContractAddressesAsync` (#94)
+    * Remove the ability to call methods on multiple authorized Exchange smart contracts (#106)
     * Cache `net_version` requests and invalidate the cache on calls to `setProvider` (#95)
     * Rename `zeroEx.exchange.batchCancelOrderAsync` to `zeroEx.exchange.batchCancelOrdersAsync`
     * Rename `zeroEx.exchange.batchFillOrderAsync` to `zeroEx.exchange.batchFillOrdersAsync`
diff --git a/src/0x.ts b/src/0x.ts
index 92a892336..aeed7b042 100644
--- a/src/0x.ts
+++ b/src/0x.ts
@@ -21,7 +21,6 @@ import {ECSignature, ZeroExError, Order, SignedOrder, Web3Provider} from './type
 import {orderHashSchema} from './schemas/order_hash_schema';
 import {orderSchema} from './schemas/order_schemas';
 import {SchemaValidator} from './utils/schema_validator';
-import {ExchangeArtifactsByName} from './exchange_artifacts_by_name';
 
 // Customize our BigNumber instances
 bigNumberConfigs.configure();
@@ -245,42 +244,4 @@ export class ZeroEx {
 
         throw new Error(ZeroExError.INVALID_SIGNATURE);
     }
-    /**
-     * Returns the ethereum addresses of all available exchange contracts
-     * supported by this library on the network that the supplied web3
-     * provider is connected to
-     * @return  The ethereum addresses of all available exchange contracts.
-     */
-    public async getAvailableExchangeContractAddressesAsync(): Promise<string[]> {
-        const networkId = await this._web3Wrapper.getNetworkIdIfExistsAsync();
-        if (_.isUndefined(networkId)) {
-            return [];
-        } else {
-            const exchangeArtifacts = _.values(ExchangeArtifactsByName);
-            const networkSpecificExchangeArtifacts = _.compact(_.map(
-                exchangeArtifacts, exchangeArtifact => exchangeArtifact.networks[networkId]));
-            const exchangeAddresses = _.map(
-                networkSpecificExchangeArtifacts,
-                networkSpecificExchangeArtifact => networkSpecificExchangeArtifact.address,
-            );
-            return exchangeAddresses;
-        }
-    }
-    /**
-     * Returns the ethereum addresses of all available exchange contracts
-     * supported by this library on the network that the supplied web3
-     * provider is connected to that are currently authorized by the Proxy contract
-     * @return  The ethereum addresses of all available and authorized exchange contract.
-     */
-    public async getProxyAuthorizedExchangeContractAddressesAsync(): Promise<string[]> {
-        const exchangeContractAddresses = await this.getAvailableExchangeContractAddressesAsync();
-        const proxyAuthorizedExchangeContractAddresses = [];
-        for (const exchangeContractAddress of exchangeContractAddresses) {
-            const isAuthorized = await this.proxy.isAuthorizedAsync(exchangeContractAddress);
-            if (isAuthorized) {
-                proxyAuthorizedExchangeContractAddresses.push(exchangeContractAddress);
-            }
-        }
-        return proxyAuthorizedExchangeContractAddresses;
-    }
 }
diff --git a/src/artifacts/exchange/Exchange_v1.json b/src/artifacts/Exchange.json
index a9481d13f..a9481d13f 100644
--- a/src/artifacts/exchange/Exchange_v1.json
+++ b/src/artifacts/Exchange.json
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index c352c782b..a6eab0fa2 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -49,7 +49,7 @@ import {signedOrderSchema, orderSchema} from '../schemas/order_schemas';
 import {constants} from '../utils/constants';
 import {TokenWrapper} from './token_wrapper';
 import {decorators} from '../utils/decorators';
-import {ExchangeArtifactsByName} from '../exchange_artifacts_by_name';
+import * as ExchangeArtifacts from '../artifacts/Exchange.json';
 
 /**
  * This class includes all the functionality related to calling methods and subscribing to
@@ -64,7 +64,7 @@ export class ExchangeWrapper extends ContractWrapper {
         [ExchangeContractErrCodes.ERROR_FILL_TRUNCATION]: ExchangeContractErrs.ORDER_FILL_ROUNDING_ERROR,
         [ExchangeContractErrCodes.ERROR_FILL_BALANCE_ALLOWANCE]: ExchangeContractErrs.FILL_BALANCE_ALLOWANCE_ERROR,
     };
-    private _exchangeContractByAddress: ExchangeContractByAddress;
+    private _exchangeContractIfExists?: ExchangeContract;
     private _exchangeLogEventEmitters: ContractEventEmitter[];
     private _tokenWrapper: TokenWrapper;
     private static _getOrderAddressesAndValues(order: Order): [OrderAddresses, OrderValues] {
@@ -89,7 +89,6 @@ export class ExchangeWrapper extends ContractWrapper {
         super(web3Wrapper);
         this._tokenWrapper = tokenWrapper;
         this._exchangeLogEventEmitters = [];
-        this._exchangeContractByAddress = {};
     }
     /**
      * Returns the unavailable takerAmount of an order. Unavailable amount is defined as the total
@@ -97,14 +96,12 @@ export class ExchangeWrapper extends ContractWrapper {
      * subtracting the unavailable amount from the total order takerAmount.
      * @param   orderHash               The hex encoded orderHash for which you would like to retrieve the
      *                                  unavailable takerAmount.
-     * @param   exchangeContractAddress The hex encoded address of the Exchange contract to call.
      * @return  The amount of the order (in taker tokens) that has either been filled or canceled.
      */
-    public async getUnavailableTakerAmountAsync(orderHash: string,
-                                                exchangeContractAddress: string): Promise<BigNumber.BigNumber> {
+    public async getUnavailableTakerAmountAsync(orderHash: string): Promise<BigNumber.BigNumber> {
         assert.doesConformToSchema('orderHash', orderHash, orderHashSchema);
 
-        const exchangeContract = await this._getExchangeContractAsync(exchangeContractAddress);
+        const exchangeContract = await this._getExchangeContractAsync();
         let unavailableTakerTokenAmount = await exchangeContract.getUnavailableTakerTokenAmount.call(orderHash);
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         unavailableTakerTokenAmount = new BigNumber(unavailableTakerTokenAmount);
@@ -113,14 +110,12 @@ export class ExchangeWrapper extends ContractWrapper {
     /**
      * Retrieve the takerAmount of an order that has already been filled.
      * @param   orderHash    The hex encoded orderHash for which you would like to retrieve the filled takerAmount.
-     * @param   exchangeContractAddress The hex encoded address of the Exchange contract to call.
      * @return  The amount of the order (in taker tokens) that has already been filled.
      */
-    public async getFilledTakerAmountAsync(orderHash: string,
-                                           exchangeContractAddress: string): Promise<BigNumber.BigNumber> {
+    public async getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber.BigNumber> {
         assert.doesConformToSchema('orderHash', orderHash, orderHashSchema);
 
-        const exchangeContract = await this._getExchangeContractAsync(exchangeContractAddress);
+        const exchangeContract = await this._getExchangeContractAsync();
         let fillAmountInBaseUnits = await exchangeContract.filled.call(orderHash);
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         fillAmountInBaseUnits = new BigNumber(fillAmountInBaseUnits);
@@ -130,14 +125,12 @@ export class ExchangeWrapper extends ContractWrapper {
      * Retrieve the takerAmount of an order that has been cancelled.
      * @param   orderHash    The hex encoded orderHash for which you would like to retrieve the
      *                       cancelled takerAmount.
-     * @param   exchangeContractAddress The hex encoded address of the Exchange contract to call.
      * @return  The amount of the order (in taker tokens) that has been cancelled.
      */
-    public async getCanceledTakerAmountAsync(orderHash: string,
-                                             exchangeContractAddress: string): Promise<BigNumber.BigNumber> {
+    public async getCanceledTakerAmountAsync(orderHash: string): Promise<BigNumber.BigNumber> {
         assert.doesConformToSchema('orderHash', orderHash, orderHashSchema);
 
-        const exchangeContract = await this._getExchangeContractAsync(exchangeContractAddress);
+        const exchangeContract = await this._getExchangeContractAsync();
         let cancelledAmountInBaseUnits = await exchangeContract.cancelled.call(orderHash);
         // Wrap BigNumbers returned from web3 with our own (later) version of BigNumber
         cancelledAmountInBaseUnits = new BigNumber(cancelledAmountInBaseUnits);
@@ -169,7 +162,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isBoolean('shouldThrowOnInsufficientBalanceOrAllowance', shouldThrowOnInsufficientBalanceOrAllowance);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
 
-        const exchangeInstance = await this._getExchangeContractAsync(signedOrder.exchangeContractAddress);
+        const exchangeInstance = await this._getExchangeContractAsync();
         await this._validateFillOrderAndThrowIfInvalidAsync(signedOrder, fillTakerTokenAmount, takerAddress);
 
         const [orderAddresses, orderValues] = ExchangeWrapper._getOrderAddressesAndValues(signedOrder);
@@ -228,9 +221,6 @@ export class ExchangeWrapper extends ContractWrapper {
         const takerTokenAddresses = _.map(signedOrders, signedOrder => signedOrder.takerTokenAddress);
         assert.hasAtMostOneUniqueValue(takerTokenAddresses,
                                        ExchangeContractErrs.MULTIPLE_TAKER_TOKENS_IN_FILL_UP_TO_DISALLOWED);
-        const exchangeContractAddresses = _.map(signedOrders, signedOrder => signedOrder.exchangeContractAddress);
-        assert.hasAtMostOneUniqueValue(exchangeContractAddresses,
-                                       ExchangeContractErrs.BATCH_ORDERS_MUST_HAVE_SAME_EXCHANGE_ADDRESS);
         assert.isBigNumber('fillTakerTokenAmount', fillTakerTokenAmount);
         assert.isBoolean('shouldThrowOnInsufficientBalanceOrAllowance', shouldThrowOnInsufficientBalanceOrAllowance);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
@@ -255,7 +245,7 @@ export class ExchangeWrapper extends ContractWrapper {
             orderAddressesValuesAndSignatureArray,
         );
 
-        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddresses[0]);
+        const exchangeInstance = await this._getExchangeContractAsync();
         const gas = await exchangeInstance.fillOrdersUpTo.estimateGas(
             orderAddressesArray,
             orderValuesArray,
@@ -310,12 +300,6 @@ export class ExchangeWrapper extends ContractWrapper {
                                       shouldThrowOnInsufficientBalanceOrAllowance: boolean,
                                       takerAddress: string): Promise<void> {
         assert.doesConformToSchema('orderFillRequests', orderFillRequests, orderFillRequestsSchema);
-        const exchangeContractAddresses = _.map(
-            orderFillRequests,
-            orderFillRequest => orderFillRequest.signedOrder.exchangeContractAddress,
-        );
-        assert.hasAtMostOneUniqueValue(exchangeContractAddresses,
-                                       ExchangeContractErrs.BATCH_ORDERS_MUST_HAVE_SAME_EXCHANGE_ADDRESS);
         assert.isBoolean('shouldThrowOnInsufficientBalanceOrAllowance', shouldThrowOnInsufficientBalanceOrAllowance);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
         for (const orderFillRequest of orderFillRequests) {
@@ -340,7 +324,7 @@ export class ExchangeWrapper extends ContractWrapper {
             orderAddressesValuesAmountsAndSignatureArray,
         );
 
-        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddresses[0]);
+        const exchangeInstance = await this._getExchangeContractAsync();
         const gas = await exchangeInstance.batchFillOrders.estimateGas(
             orderAddressesArray,
             orderValuesArray,
@@ -384,11 +368,10 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isBigNumber('fillTakerTokenAmount', fillTakerTokenAmount);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper);
 
-        const exchangeInstance = await this._getExchangeContractAsync(signedOrder.exchangeContractAddress);
+        const exchangeInstance = await this._getExchangeContractAsync();
         await this._validateFillOrderAndThrowIfInvalidAsync(signedOrder, fillTakerTokenAmount, takerAddress);
 
-        await this._validateFillOrKillOrderAndThrowIfInvalidAsync(signedOrder, exchangeInstance.address,
-                                                                 fillTakerTokenAmount);
+        await this._validateFillOrKillOrderAndThrowIfInvalidAsync(signedOrder, fillTakerTokenAmount);
 
         const [orderAddresses, orderValues] = ExchangeWrapper._getOrderAddressesAndValues(signedOrder);
 
@@ -438,10 +421,9 @@ export class ExchangeWrapper extends ContractWrapper {
         if (_.isEmpty(orderFillOrKillRequests)) {
             return; // no-op
         }
-        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddresses[0]);
+        const exchangeInstance = await this._getExchangeContractAsync();
         for (const request of orderFillOrKillRequests) {
-            await this._validateFillOrKillOrderAndThrowIfInvalidAsync(request.signedOrder, exchangeInstance.address,
-                                                                     request.fillTakerAmount);
+            await this._validateFillOrKillOrderAndThrowIfInvalidAsync(request.signedOrder, request.fillTakerAmount);
         }
 
         const orderAddressesValuesAndTakerTokenFillAmounts = _.map(orderFillOrKillRequests, request => {
@@ -497,7 +479,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isBigNumber('takerTokenCancelAmount', cancelTakerTokenAmount);
         await assert.isSenderAddressAsync('order.maker', order.maker, this._web3Wrapper);
 
-        const exchangeInstance = await this._getExchangeContractAsync(order.exchangeContractAddress);
+        const exchangeInstance = await this._getExchangeContractAsync();
         await this._validateCancelOrderAndThrowIfInvalidAsync(order, cancelTakerTokenAmount);
 
         const [orderAddresses, orderValues] = ExchangeWrapper._getOrderAddressesAndValues(order);
@@ -551,7 +533,7 @@ export class ExchangeWrapper extends ContractWrapper {
         if (_.isEmpty(orderCancellationRequests)) {
             return; // no-op
         }
-        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddresses[0]);
+        const exchangeInstance = await this._getExchangeContractAsync();
         const orderAddressesValuesAndTakerTokenCancelAmounts = _.map(orderCancellationRequests, cancellationRequest => {
             return [
                 ...ExchangeWrapper._getOrderAddressesAndValues(cancellationRequest.order),
@@ -596,7 +578,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.doesBelongToStringEnum('eventName', eventName, ExchangeEvents);
         assert.doesConformToSchema('subscriptionOpts', subscriptionOpts, subscriptionOptsSchema);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, indexFilterValuesSchema);
-        const exchangeContract = await this._getExchangeContractAsync(exchangeContractAddress);
+        const exchangeContract = await this._getExchangeContractAsync();
         let createLogEvent: CreateContractEvent;
         switch (eventName) {
             case ExchangeEvents.LogFill:
@@ -626,18 +608,26 @@ export class ExchangeWrapper extends ContractWrapper {
         await Promise.all(stopWatchingPromises);
         this._exchangeLogEventEmitters = [];
     }
+    /**
+     * Retrieves the Ethereum address of the Exchange contract deployed on the network
+     * that the user-passed web3 provider is connected to.
+     * @returns The Ethereum address of the Exchange contract being used.
+     */
+    public async getContractAddressAsync(): Promise<string> {
+        const exchangeInstance = await this._getExchangeContractAsync();
+        return exchangeInstance.address;
+    }
     private async _invalidateContractInstancesAsync(): Promise<void> {
         await this.stopWatchingAllEventsAsync();
-        this._exchangeContractByAddress = {};
+        delete this._exchangeContractIfExists;
     }
     private async _isValidSignatureUsingContractCallAsync(dataHex: string, ecSignature: ECSignature,
-                                                          signerAddressHex: string,
-                                                          exchangeContractAddress: string): Promise<boolean> {
+                                                          signerAddressHex: string): Promise<boolean> {
         assert.isHexString('dataHex', dataHex);
         assert.doesConformToSchema('ecSignature', ecSignature, ecSignatureSchema);
         assert.isETHAddressHex('signerAddressHex', signerAddressHex);
 
-        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddress);
+        const exchangeInstance = await this._getExchangeContractAsync();
 
         const isValidSignature = await exchangeInstance.isValidSignature.call(
             signerAddressHex,
@@ -649,7 +639,7 @@ export class ExchangeWrapper extends ContractWrapper {
         return isValidSignature;
     }
     private async _getOrderHashHexUsingContractCallAsync(order: Order|SignedOrder): Promise<string> {
-        const exchangeInstance = await this._getExchangeContractAsync(order.exchangeContractAddress);
+        const exchangeInstance = await this._getExchangeContractAsync();
         const [orderAddresses, orderValues] = ExchangeWrapper._getOrderAddressesAndValues(order);
         const orderHashHex = await exchangeInstance.getOrderHash.call(orderAddresses, orderValues);
         return orderHashHex;
@@ -673,7 +663,6 @@ export class ExchangeWrapper extends ContractWrapper {
 
         const wouldRoundingErrorOccur = await this._isRoundingErrorAsync(
             signedOrder.takerTokenAmount, fillTakerAmount, signedOrder.makerTokenAmount,
-            signedOrder.exchangeContractAddress,
         );
         if (wouldRoundingErrorOccur) {
             throw new Error(ExchangeContractErrs.ORDER_FILL_ROUNDING_ERROR);
@@ -685,7 +674,7 @@ export class ExchangeWrapper extends ContractWrapper {
             throw new Error(ExchangeContractErrs.ORDER_CANCEL_AMOUNT_ZERO);
         }
         const orderHash = utils.getOrderHashHex(order);
-        const unavailableAmount = await this.getUnavailableTakerAmountAsync(orderHash, order.exchangeContractAddress);
+        const unavailableAmount = await this.getUnavailableTakerAmountAsync(orderHash);
         if (order.takerTokenAmount.minus(unavailableAmount).eq(0)) {
             throw new Error(ExchangeContractErrs.ORDER_ALREADY_CANCELLED_OR_FILLED);
         }
@@ -695,11 +684,10 @@ export class ExchangeWrapper extends ContractWrapper {
         }
     }
     private async _validateFillOrKillOrderAndThrowIfInvalidAsync(signedOrder: SignedOrder,
-                                                                 exchangeContractAddress: string,
                                                                  fillTakerAmount: BigNumber.BigNumber) {
         // Check that fillValue available >= fillTakerAmount
         const orderHashHex = utils.getOrderHashHex(signedOrder);
-        const unavailableTakerAmount = await this.getUnavailableTakerAmountAsync(orderHashHex, exchangeContractAddress);
+        const unavailableTakerAmount = await this.getUnavailableTakerAmountAsync(orderHashHex);
         const remainingTakerAmount = signedOrder.takerTokenAmount.minus(unavailableTakerAmount);
         if (remainingTakerAmount < fillTakerAmount) {
             throw new Error(ExchangeContractErrs.INSUFFICIENT_REMAINING_FILL_AMOUNT);
@@ -776,40 +764,24 @@ export class ExchangeWrapper extends ContractWrapper {
     }
     private async _isRoundingErrorAsync(numerator: BigNumber.BigNumber,
                                         demoninator: BigNumber.BigNumber,
-                                        makerTokenAmount: BigNumber.BigNumber,
-                                        exchangeContractAddress: string): Promise<boolean> {
+                                        makerTokenAmount: BigNumber.BigNumber): Promise<boolean> {
         await assert.isUserAddressAvailableAsync(this._web3Wrapper);
-        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddress);
+        const exchangeInstance = await this._getExchangeContractAsync();
         const isRoundingError = await exchangeInstance.isRoundingError.call(
             demoninator, numerator, makerTokenAmount,
         );
         return isRoundingError;
     }
-    private async _getExchangeContractAsync(exchangeContractAddress: string): Promise<ExchangeContract> {
-        if (!_.isUndefined(this._exchangeContractByAddress[exchangeContractAddress])) {
-            return this._exchangeContractByAddress[exchangeContractAddress];
+    private async _getExchangeContractAsync(): Promise<ExchangeContract> {
+        if (!_.isUndefined(this._exchangeContractIfExists)) {
+            return this._exchangeContractIfExists;
         }
-        const ExchangeArtifacts = this._getExchangeArtifactsByAddressOrThrow(exchangeContractAddress);
         const contractInstance = await this._instantiateContractIfExistsAsync((ExchangeArtifacts as any));
-        this._exchangeContractByAddress[exchangeContractAddress] = contractInstance as ExchangeContract;
-        return this._exchangeContractByAddress[exchangeContractAddress];
-    }
-    private _getExchangeArtifactsByAddressOrThrow(exchangeContractAddress: string): ContractArtifact {
-        const exchangeArtifacts = _.values<ContractArtifact>(ExchangeArtifactsByName);
-        for (const exchangeArtifact of exchangeArtifacts) {
-            const networkSpecificExchangeArtifactValues = _.values(exchangeArtifact.networks);
-            const exchangeAddressesInArtifact = _.map(
-                networkSpecificExchangeArtifactValues,
-                networkSpecificExchangeArtifact => networkSpecificExchangeArtifact.address,
-            );
-            if (_.includes(exchangeAddressesInArtifact, exchangeContractAddress)) {
-                return exchangeArtifact;
-            }
-        }
-        throw new Error(ZeroExError.EXCHANGE_CONTRACT_DOES_NOT_EXIST);
+        this._exchangeContractIfExists = contractInstance as ExchangeContract;
+        return this._exchangeContractIfExists;
     }
     private async _getZRXTokenAddressAsync(exchangeContractAddress: string): Promise<string> {
-        const exchangeInstance = await this._getExchangeContractAsync(exchangeContractAddress);
+        const exchangeInstance = await this._getExchangeContractAsync();
         const ZRXtokenAddress = await exchangeInstance.ZRX_TOKEN_CONTRACT.call();
         return ZRXtokenAddress;
     }
diff --git a/src/contract_wrappers/proxy_wrapper.ts b/src/contract_wrappers/proxy_wrapper.ts
index 05d4e142c..c247754f8 100644
--- a/src/contract_wrappers/proxy_wrapper.ts
+++ b/src/contract_wrappers/proxy_wrapper.ts
@@ -21,10 +21,9 @@ export class ProxyWrapper extends ContractWrapper {
     }
     /**
      * Get the list of all Exchange contract addresses authorized by the Proxy contract.
-     * @param   exchangeContractAddress     The hex encoded address of the Exchange contract to call.
      * @return  The list of authorized addresses.
      */
-    public async getAuthorizedAddressesAsync(exchangeContractAddress: string): Promise<string[]> {
+    public async getAuthorizedAddressesAsync(): Promise<string[]> {
         const proxyContractInstance = await this._getProxyContractAsync();
         const authorizedAddresses = await proxyContractInstance.getAuthorizedAddresses.call();
         return authorizedAddresses;
diff --git a/src/exchange_artifacts_by_name.ts b/src/exchange_artifacts_by_name.ts
deleted file mode 100644
index d5ae6e180..000000000
--- a/src/exchange_artifacts_by_name.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-import {ContractArtifact} from './types';
-import * as Exchange_v1 from './artifacts/exchange/Exchange_v1.json';
-
-export const ExchangeArtifactsByName = {
-    Exchange_v1: Exchange_v1 as any as ContractArtifact,
-};
diff --git a/test/0x.js_test.ts b/test/0x.js_test.ts
index 0c82c803d..c6ede843f 100644
--- a/test/0x.js_test.ts
+++ b/test/0x.js_test.ts
@@ -17,11 +17,10 @@ describe('ZeroEx library', () => {
     const zeroEx = new ZeroEx(web3.currentProvider);
     describe('#setProvider', () => {
         it('overrides provider in nested web3s and invalidates contractInstances', async () => {
-            const [exchangeContractAddress] = await zeroEx.getAvailableExchangeContractAddressesAsync();
             // Instantiate the contract instances with the current provider
-            await (zeroEx.exchange as any)._getExchangeContractAsync(exchangeContractAddress);
+            await (zeroEx.exchange as any)._getExchangeContractAsync();
             await (zeroEx.tokenRegistry as any)._getTokenRegistryContractAsync();
-            expect((zeroEx.exchange as any)._exchangeContractByAddress[exchangeContractAddress]).to.not.be.undefined();
+            expect((zeroEx.exchange as any)._exchangeContractIfExists).to.not.be.undefined();
             expect((zeroEx.tokenRegistry as any)._tokenRegistryContractIfExists).to.not.be.undefined();
 
             const newProvider = web3Factory.getRpcProvider();
@@ -30,7 +29,7 @@ describe('ZeroEx library', () => {
             await zeroEx.setProviderAsync(newProvider);
 
             // Check that contractInstances with old provider are removed after provider update
-            expect((zeroEx.exchange as any)._exchangeContractByAddress[exchangeContractAddress]).to.be.undefined();
+            expect((zeroEx.exchange as any)._exchangeContractIfExists).to.be.undefined();
             expect((zeroEx.tokenRegistry as any)._tokenRegistryContractIfExists).to.be.undefined();
 
             // Check that all nested web3 wrapper instances return the updated provider
@@ -52,10 +51,6 @@ describe('ZeroEx library', () => {
             s: '0x40349190569279751135161d22529dc25add4f6069af05be04cacbda2ace2254',
         };
         const address = '0x5409ed021d9299bf6814279a6a1411a7e866a631';
-        let exchangeContractAddress: string;
-        before(async () => {
-            [exchangeContractAddress] = await zeroEx.getAvailableExchangeContractAddressesAsync();
-        });
         it('should return false if the data doesn\'t pertain to the signature & address', async () => {
             expect(ZeroEx.isValidSignature('0x0', signature, address)).to.be.false();
             return expect(
@@ -81,7 +76,7 @@ describe('ZeroEx library', () => {
             const isValidSignatureLocal = ZeroEx.isValidSignature(dataHex, signature, address);
             expect(isValidSignatureLocal).to.be.true();
             const isValidSignatureOnContract = await (zeroEx.exchange as any)
-                ._isValidSignatureUsingContractCallAsync(dataHex, signature, address, exchangeContractAddress);
+                ._isValidSignatureUsingContractCallAsync(dataHex, signature, address);
             return expect(isValidSignatureOnContract).to.be.true();
         });
     });
@@ -210,22 +205,4 @@ describe('ZeroEx library', () => {
             expect(ecSignature).to.deep.equal(expectedECSignature);
         });
     });
-    describe('#getAvailableExchangeContractAddressesAsync', () => {
-        it('returns the exchange contract addresses', async () => {
-            const exchangeAddresses = await zeroEx.getAvailableExchangeContractAddressesAsync();
-            _.map(exchangeAddresses, exchangeAddress => {
-                assert.isETHAddressHex('exchangeAddress', exchangeAddress);
-            });
-        });
-    });
-    describe('#getProxyAuthorizedExchangeContractAddressesAsync', () => {
-        it('returns the Proxy authorized exchange contract addresses', async () => {
-            const exchangeAddresses = await zeroEx.getProxyAuthorizedExchangeContractAddressesAsync();
-            for (const exchangeAddress of exchangeAddresses) {
-                assert.isETHAddressHex('exchangeAddress', exchangeAddress);
-                const isAuthorized = await zeroEx.proxy.isAuthorizedAsync(exchangeAddress);
-                expect(isAuthorized).to.be.true();
-            }
-        });
-    });
 });
diff --git a/test/artifacts_test.ts b/test/artifacts_test.ts
index 8393250aa..04b9ecb2d 100644
--- a/test/artifacts_test.ts
+++ b/test/artifacts_test.ts
@@ -27,8 +27,7 @@ describe('Artifacts', () => {
             await (zeroEx.token as any)._getProxyAddressAsync();
         }).timeout(TIMEOUT);
         it('exchange contract is deployed', async () => {
-            const exchangeContractAddresses = await zeroEx.getAvailableExchangeContractAddressesAsync();
-            expect(exchangeContractAddresses).to.have.lengthOf.above(0);
+            await zeroEx.exchange.getContractAddressAsync();
         }).timeout(TIMEOUT);
     });
 });
diff --git a/test/exchange_wrapper_test.ts b/test/exchange_wrapper_test.ts
index ed2e45abf..d8af9d1cd 100644
--- a/test/exchange_wrapper_test.ts
+++ b/test/exchange_wrapper_test.ts
@@ -44,7 +44,7 @@ describe('ExchangeWrapper', () => {
     before(async () => {
         web3 = web3Factory.create();
         zeroEx = new ZeroEx(web3.currentProvider);
-        [exchangeContractAddress] = await zeroEx.getAvailableExchangeContractAddressesAsync();
+        exchangeContractAddress = await zeroEx.exchange.getContractAddressAsync();
         userAddresses = await promisify(web3.eth.getAccounts)();
         tokens = await zeroEx.tokenRegistry.getTokensAsync();
         tokenUtils = new TokenUtils(tokens);
@@ -418,12 +418,8 @@ describe('ExchangeWrapper', () => {
                 });
                 it('should successfully fill multiple orders', async () => {
                     await zeroEx.exchange.batchFillOrdersAsync(orderFillBatch, shouldCheckTransfer, takerAddress);
-                    const filledAmount = await zeroEx.exchange.getFilledTakerAmountAsync(
-                        signedOrderHashHex, exchangeContractAddress,
-                    );
-                    const anotherFilledAmount = await zeroEx.exchange.getFilledTakerAmountAsync(
-                        anotherOrderHashHex, exchangeContractAddress,
-                    );
+                    const filledAmount = await zeroEx.exchange.getFilledTakerAmountAsync(signedOrderHashHex);
+                    const anotherFilledAmount = await zeroEx.exchange.getFilledTakerAmountAsync(anotherOrderHashHex);
                     expect(filledAmount).to.be.bignumber.equal(fillTakerAmount);
                     expect(anotherFilledAmount).to.be.bignumber.equal(fillTakerAmount);
                 });
@@ -455,12 +451,8 @@ describe('ExchangeWrapper', () => {
                     await zeroEx.exchange.fillOrdersUpToAsync(
                         signedOrders, fillUpToAmount, shouldCheckTransfer, takerAddress,
                     );
-                    const filledAmount = await zeroEx.exchange.getFilledTakerAmountAsync(
-                        signedOrderHashHex, exchangeContractAddress,
-                    );
-                    const anotherFilledAmount = await zeroEx.exchange.getFilledTakerAmountAsync(
-                        anotherOrderHashHex, exchangeContractAddress,
-                    );
+                    const filledAmount = await zeroEx.exchange.getFilledTakerAmountAsync(signedOrderHashHex);
+                    const anotherFilledAmount = await zeroEx.exchange.getFilledTakerAmountAsync(anotherOrderHashHex);
                     expect(filledAmount).to.be.bignumber.equal(fillableAmount);
                     const remainingFillAmount = fillableAmount.minus(1);
                     expect(anotherFilledAmount).to.be.bignumber.equal(remainingFillAmount);
@@ -520,9 +512,7 @@ describe('ExchangeWrapper', () => {
             describe('successful cancels', () => {
                 it('should cancel an order', async () => {
                     await zeroEx.exchange.cancelOrderAsync(signedOrder, cancelAmount);
-                    const cancelledAmount = await zeroEx.exchange.getCanceledTakerAmountAsync(
-                        orderHashHex, exchangeContractAddress,
-                    );
+                    const cancelledAmount = await zeroEx.exchange.getCanceledTakerAmountAsync(orderHashHex);
                     expect(cancelledAmount).to.be.bignumber.equal(cancelAmount);
                 });
                 it('should return cancelled amount', async () => {
@@ -568,11 +558,9 @@ describe('ExchangeWrapper', () => {
             describe('successful batch cancels', () => {
                 it('should cancel a batch of orders', async () => {
                     await zeroEx.exchange.batchCancelOrdersAsync(cancelBatch);
-                    const cancelledAmount = await zeroEx.exchange.getCanceledTakerAmountAsync(
-                        orderHashHex, exchangeContractAddress,
-                    );
+                    const cancelledAmount = await zeroEx.exchange.getCanceledTakerAmountAsync(orderHashHex);
                     const anotherCancelledAmount = await zeroEx.exchange.getCanceledTakerAmountAsync(
-                        anotherOrderHashHex, exchangeContractAddress,
+                        anotherOrderHashHex,
                     );
                     expect(cancelledAmount).to.be.bignumber.equal(cancelAmount);
                     expect(anotherCancelledAmount).to.be.bignumber.equal(cancelAmount);
@@ -605,68 +593,49 @@ describe('ExchangeWrapper', () => {
         describe('#getUnavailableTakerAmountAsync', () => {
             it('should throw if passed an invalid orderHash', async () => {
                 const invalidOrderHashHex = '0x123';
-                return expect(zeroEx.exchange.getUnavailableTakerAmountAsync(
-                    invalidOrderHashHex, exchangeContractAddress,
-                )).to.be.rejected();
+                return expect(zeroEx.exchange.getUnavailableTakerAmountAsync(invalidOrderHashHex)).to.be.rejected();
             });
             it('should return zero if passed a valid but non-existent orderHash', async () => {
-                const unavailableValueT = await zeroEx.exchange.getUnavailableTakerAmountAsync(
-                    NON_EXISTENT_ORDER_HASH, exchangeContractAddress,
-                );
+                const unavailableValueT = await zeroEx.exchange.getUnavailableTakerAmountAsync(NON_EXISTENT_ORDER_HASH);
                 expect(unavailableValueT).to.be.bignumber.equal(0);
             });
             it('should return the unavailableValueT for a valid and partially filled orderHash', async () => {
-                const unavailableValueT = await zeroEx.exchange.getUnavailableTakerAmountAsync(
-                    orderHash, exchangeContractAddress,
-                );
+                const unavailableValueT = await zeroEx.exchange.getUnavailableTakerAmountAsync(orderHash);
                 expect(unavailableValueT).to.be.bignumber.equal(partialFillAmount);
             });
         });
         describe('#getFilledTakerAmountAsync', () => {
             it('should throw if passed an invalid orderHash', async () => {
                 const invalidOrderHashHex = '0x123';
-                return expect(zeroEx.exchange.getFilledTakerAmountAsync(
-                    invalidOrderHashHex, exchangeContractAddress,
-                )).to.be.rejected();
+                return expect(zeroEx.exchange.getFilledTakerAmountAsync(invalidOrderHashHex)).to.be.rejected();
             });
             it('should return zero if passed a valid but non-existent orderHash', async () => {
-                const filledValueT = await zeroEx.exchange.getFilledTakerAmountAsync(
-                    NON_EXISTENT_ORDER_HASH, exchangeContractAddress,
+                const filledValueT = await zeroEx.exchange.getFilledTakerAmountAsync(NON_EXISTENT_ORDER_HASH,
                 );
                 expect(filledValueT).to.be.bignumber.equal(0);
             });
             it('should return the filledValueT for a valid and partially filled orderHash', async () => {
-                const filledValueT = await zeroEx.exchange.getFilledTakerAmountAsync(
-                    orderHash, exchangeContractAddress,
-                );
+                const filledValueT = await zeroEx.exchange.getFilledTakerAmountAsync(orderHash);
                 expect(filledValueT).to.be.bignumber.equal(partialFillAmount);
             });
         });
         describe('#getCanceledTakerAmountAsync', () => {
             it('should throw if passed an invalid orderHash', async () => {
                 const invalidOrderHashHex = '0x123';
-                return expect(zeroEx.exchange.getCanceledTakerAmountAsync(
-                    invalidOrderHashHex, exchangeContractAddress,
-                )).to.be.rejected();
+                return expect(zeroEx.exchange.getCanceledTakerAmountAsync(invalidOrderHashHex)).to.be.rejected();
             });
             it('should return zero if passed a valid but non-existent orderHash', async () => {
-                const cancelledValueT = await zeroEx.exchange.getCanceledTakerAmountAsync(
-                    NON_EXISTENT_ORDER_HASH, exchangeContractAddress,
-                );
+                const cancelledValueT = await zeroEx.exchange.getCanceledTakerAmountAsync(NON_EXISTENT_ORDER_HASH);
                 expect(cancelledValueT).to.be.bignumber.equal(0);
             });
             it('should return the cancelledValueT for a valid and partially filled orderHash', async () => {
-                const cancelledValueT = await zeroEx.exchange.getCanceledTakerAmountAsync(
-                    orderHash, exchangeContractAddress,
-                );
+                const cancelledValueT = await zeroEx.exchange.getCanceledTakerAmountAsync(orderHash);
                 expect(cancelledValueT).to.be.bignumber.equal(0);
             });
             it('should return the cancelledValueT for a valid and cancelled orderHash', async () => {
                 const cancelAmount = fillableAmount.minus(partialFillAmount);
                 await zeroEx.exchange.cancelOrderAsync(signedOrder, cancelAmount);
-                const cancelledValueT = await zeroEx.exchange.getCanceledTakerAmountAsync(
-                    orderHash, exchangeContractAddress,
-                );
+                const cancelledValueT = await zeroEx.exchange.getCanceledTakerAmountAsync(orderHash);
                 expect(cancelledValueT).to.be.bignumber.equal(cancelAmount);
             });
         });
diff --git a/test/proxy_wrapper_test.ts b/test/proxy_wrapper_test.ts
index c7f1a080a..42baed2b1 100644
--- a/test/proxy_wrapper_test.ts
+++ b/test/proxy_wrapper_test.ts
@@ -9,11 +9,9 @@ const expect = chai.expect;
 
 describe('ProxyWrapper', () => {
     let zeroEx: ZeroEx;
-    let exchangeContractAddress: string;
     before(async () => {
         const web3 = web3Factory.create();
         zeroEx = new ZeroEx(web3.currentProvider);
-        [exchangeContractAddress] = await zeroEx.getAvailableExchangeContractAddressesAsync();
     });
     describe('#isAuthorizedAsync', () => {
         it('should return false if the address is not authorized', async () => {
@@ -23,7 +21,7 @@ describe('ProxyWrapper', () => {
     });
     describe('#getAuthorizedAddressesAsync', () => {
         it('should return the list of authorized addresses', async () => {
-            const authorizedAddresses = await zeroEx.proxy.getAuthorizedAddressesAsync(exchangeContractAddress);
+            const authorizedAddresses = await zeroEx.proxy.getAuthorizedAddressesAsync();
             for (const authorizedAddress of authorizedAddresses) {
                 const isAuthorized = await zeroEx.proxy.isAuthorizedAsync(authorizedAddress);
                 expect(isAuthorized).to.be.true();