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-rw-r--r--src/0x.js.ts4
-rw-r--r--src/contract_wrappers/token_wrapper.ts93
-rw-r--r--src/types.ts16
-rw-r--r--src/utils/constants.ts1
-rw-r--r--test/exchange_wrapper.ts2
-rw-r--r--test/token_wrapper_test.ts92
6 files changed, 206 insertions, 2 deletions
diff --git a/src/0x.js.ts b/src/0x.js.ts
index 69c0cc567..d231c579e 100644
--- a/src/0x.js.ts
+++ b/src/0x.js.ts
@@ -13,6 +13,7 @@ import compareVersions = require('compare-versions');
import {ExchangeWrapper} from './contract_wrappers/exchange_wrapper';
import {TokenRegistryWrapper} from './contract_wrappers/token_registry_wrapper';
import {ecSignatureSchema} from './schemas/ec_signature_schema';
+import {TokenWrapper} from './contract_wrappers/token_wrapper';
import {SolidityTypes, ECSignature, ZeroExError} from './types';
const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
@@ -20,6 +21,7 @@ const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
export class ZeroEx {
public exchange: ExchangeWrapper;
public tokenRegistry: TokenRegistryWrapper;
+ public token: TokenWrapper;
private web3Wrapper: Web3Wrapper;
/**
* Computes the orderHash given the order parameters and returns it as a hex encoded string.
@@ -135,6 +137,7 @@ export class ZeroEx {
this.web3Wrapper = new Web3Wrapper(web3);
this.exchange = new ExchangeWrapper(this.web3Wrapper);
this.tokenRegistry = new TokenRegistryWrapper(this.web3Wrapper);
+ this.token = new TokenWrapper(this.web3Wrapper);
}
/**
* Sets a new provider for the web3 instance used by 0x.js
@@ -143,6 +146,7 @@ export class ZeroEx {
this.web3Wrapper.setProvider(provider);
this.exchange.invalidateContractInstance();
this.tokenRegistry.invalidateContractInstance();
+ this.token.invalidateContractInstances();
}
/**
* Signs an orderHash and returns it's elliptic curve signature
diff --git a/src/contract_wrappers/token_wrapper.ts b/src/contract_wrappers/token_wrapper.ts
new file mode 100644
index 000000000..35e008905
--- /dev/null
+++ b/src/contract_wrappers/token_wrapper.ts
@@ -0,0 +1,93 @@
+import * as _ from 'lodash';
+import * as BigNumber from 'bignumber.js';
+import {Web3Wrapper} from '../web3_wrapper';
+import {assert} from '../utils/assert';
+import {constants} from '../utils/constants';
+import {ContractWrapper} from './contract_wrapper';
+import * as TokenArtifacts from '../artifacts/Token.json';
+import * as ProxyArtifacts from '../artifacts/Proxy.json';
+import {TokenContract, ZeroExError} from '../types';
+
+const ALLOWANCE_TO_ZERO_GAS_AMOUNT = 45730;
+
+export class TokenWrapper extends ContractWrapper {
+ private tokenContractsByAddress: {[address: string]: TokenContract};
+ constructor(web3Wrapper: Web3Wrapper) {
+ super(web3Wrapper);
+ this.tokenContractsByAddress = {};
+ }
+ public invalidateContractInstances() {
+ this.tokenContractsByAddress = {};
+ }
+ /**
+ * Returns an owner's ERC20 token balance.
+ */
+ public async getBalanceAsync(tokenAddress: string, ownerAddress: string): Promise<BigNumber.BigNumber> {
+ assert.isETHAddressHex('ownerAddress', ownerAddress);
+ assert.isETHAddressHex('tokenAddress', tokenAddress);
+
+ const tokenContract = await this.getTokenContractAsync(tokenAddress);
+ let balance = await tokenContract.balanceOf.call(ownerAddress);
+ // The BigNumber instance returned by Web3 is of a much older version then our own, we therefore
+ // should always re-instantiate the returned BigNumber after retrieval.
+ balance = new BigNumber(balance);
+ return balance;
+ }
+ /**
+ * Retrieves the allowance in baseUnits of the ERC20 token set to the 0x proxy contract
+ * by an owner address.
+ */
+ public async getProxyAllowanceAsync(tokenAddress: string, ownerAddress: string) {
+ assert.isETHAddressHex('ownerAddress', ownerAddress);
+ assert.isETHAddressHex('tokenAddress', tokenAddress);
+
+ const tokenContract = await this.getTokenContractAsync(tokenAddress);
+ const proxyAddress = await this.getProxyAddressAsync();
+ let allowanceInBaseUnits = await tokenContract.allowance.call(ownerAddress, proxyAddress);
+ allowanceInBaseUnits = new BigNumber(allowanceInBaseUnits);
+ return allowanceInBaseUnits;
+ }
+ /**
+ * Sets the 0x proxy contract's allowance to a specified number of a tokens' baseUnits on behalf
+ * of an owner address.
+ */
+ public async setProxyAllowanceAsync(tokenAddress: string, ownerAddress: string,
+ amountInBaseUnits: BigNumber.BigNumber) {
+ assert.isETHAddressHex('ownerAddress', ownerAddress);
+ assert.isETHAddressHex('tokenAddress', tokenAddress);
+ assert.isBigNumber('amountInBaseUnits', amountInBaseUnits);
+
+ const tokenContract = await this.getTokenContractAsync(tokenAddress);
+ const proxyAddress = await this.getProxyAddressAsync();
+ // Hack: for some reason default estimated gas amount causes `base fee exceeds gas limit` exception
+ // on testrpc. Probably related to https://github.com/ethereumjs/testrpc/issues/294
+ // TODO: Debug issue in testrpc and submit a PR, then remove this hack
+ const networkIdIfExists = await this.web3Wrapper.getNetworkIdIfExistsAsync();
+ const gas = networkIdIfExists === constants.TESTRPC_NETWORK_ID ? ALLOWANCE_TO_ZERO_GAS_AMOUNT : undefined;
+ await tokenContract.approve(proxyAddress, amountInBaseUnits, {
+ from: ownerAddress,
+ gas,
+ });
+ }
+ private async getTokenContractAsync(tokenAddress: string): Promise<TokenContract> {
+ let tokenContract = this.tokenContractsByAddress[tokenAddress];
+ if (!_.isUndefined(tokenContract)) {
+ return tokenContract;
+ }
+ const contractInstance = await this.instantiateContractIfExistsAsync((TokenArtifacts as any), tokenAddress);
+ tokenContract = contractInstance as TokenContract;
+ this.tokenContractsByAddress[tokenAddress] = tokenContract;
+ return tokenContract;
+ }
+ private async getProxyAddressAsync() {
+ const networkIdIfExists = await this.web3Wrapper.getNetworkIdIfExistsAsync();
+ const proxyNetworkConfigsIfExists = _.isUndefined(networkIdIfExists) ?
+ undefined :
+ (ProxyArtifacts as any).networks[networkIdIfExists];
+ if (_.isUndefined(proxyNetworkConfigsIfExists)) {
+ throw new Error(ZeroExError.CONTRACT_NOT_DEPLOYED_ON_NETWORK);
+ }
+ const proxyAddress = proxyNetworkConfigsIfExists.address;
+ return proxyAddress;
+ }
+}
diff --git a/src/types.ts b/src/types.ts
index 6fce95706..3619c800f 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -14,6 +14,7 @@ export const ZeroExError = strEnum([
'UNHANDLED_ERROR',
'USER_HAS_NO_ASSOCIATED_ADDRESSES',
'INVALID_SIGNATURE',
+ 'CONTRACT_NOT_DEPLOYED_ON_NETWORK',
]);
export type ZeroExError = keyof typeof ZeroExError;
@@ -30,6 +31,16 @@ export interface ExchangeContract {
isValidSignature: any;
}
+export interface TokenContract {
+ balanceOf: {
+ call: (address: string) => Promise<BigNumber.BigNumber>;
+ };
+ allowance: {
+ call: (ownerAddress: string, allowedAddress: string) => Promise<BigNumber.BigNumber>;
+ };
+ approve: (proxyAddress: string, amountInBaseUnits: BigNumber.BigNumber, txOpts: TxOpts) => void;
+}
+
export interface TokenRegistryContract {
getTokenMetaData: {
call: (address: string) => Promise<TokenMetadata>;
@@ -55,3 +66,8 @@ export interface Token {
decimals: number;
url: string;
};
+
+export interface TxOpts {
+ from: string;
+ gas?: number;
+};
diff --git a/src/utils/constants.ts b/src/utils/constants.ts
index ec2fe744a..5a5ba0e0a 100644
--- a/src/utils/constants.ts
+++ b/src/utils/constants.ts
@@ -1,3 +1,4 @@
export const constants = {
NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
+ TESTRPC_NETWORK_ID: 50,
};
diff --git a/test/exchange_wrapper.ts b/test/exchange_wrapper.ts
index 55b84ce36..e42454089 100644
--- a/test/exchange_wrapper.ts
+++ b/test/exchange_wrapper.ts
@@ -1,12 +1,10 @@
import 'mocha';
import * as chai from 'chai';
-import chaiAsPromised = require('chai-as-promised');
import {web3Factory} from './utils/web3_factory';
import {ZeroEx} from '../src/0x.js';
import {BlockchainLifecycle} from './utils/blockchain_lifecycle';
const expect = chai.expect;
-chai.use(chaiAsPromised);
const blockchainLifecycle = new BlockchainLifecycle();
describe('ExchangeWrapper', () => {
diff --git a/test/token_wrapper_test.ts b/test/token_wrapper_test.ts
new file mode 100644
index 000000000..5ce3efb14
--- /dev/null
+++ b/test/token_wrapper_test.ts
@@ -0,0 +1,92 @@
+import 'mocha';
+import * as chai from 'chai';
+import * as Web3 from 'web3';
+import * as BigNumber from 'bignumber.js';
+import promisify = require('es6-promisify');
+import {web3Factory} from './utils/web3_factory';
+import {ZeroEx} from '../src/0x.js';
+import {ZeroExError, Token} from '../src/types';
+import {BlockchainLifecycle} from './utils/blockchain_lifecycle';
+
+const expect = chai.expect;
+const blockchainLifecycle = new BlockchainLifecycle();
+
+describe('TokenWrapper', () => {
+ let web3: Web3;
+ let zeroEx: ZeroEx;
+ let userAddresses: string[];
+ let tokens: Token[];
+ before(async () => {
+ web3 = web3Factory.create();
+ zeroEx = new ZeroEx(web3);
+ userAddresses = await promisify(web3.eth.getAccounts)();
+ tokens = await zeroEx.tokenRegistry.getTokensAsync();
+ });
+ beforeEach(async () => {
+ await blockchainLifecycle.startAsync();
+ });
+ afterEach(async () => {
+ await blockchainLifecycle.revertAsync();
+ });
+ describe('#getBalanceAsync', () => {
+ it('should return the balance for an existing ERC20 token', async () => {
+ const aToken = tokens[0];
+ const aOwnerAddress = userAddresses[0];
+ const balance = await zeroEx.token.getBalanceAsync(aToken.address, aOwnerAddress);
+ const expectedBalance = new BigNumber('100000000000000000000000000');
+ expect(balance).to.be.bignumber.equal(expectedBalance);
+ });
+ it('should throw a CONTRACT_DOES_NOT_EXIST error for a non-existent token contract', async () => {
+ const nonExistentTokenAddress = '0x9dd402f14d67e001d8efbe6583e51bf9706aa065';
+ const aOwnerAddress = userAddresses[0];
+ expect(zeroEx.token.getBalanceAsync(nonExistentTokenAddress, aOwnerAddress))
+ .to.be.rejectedWith(ZeroExError.CONTRACT_DOES_NOT_EXIST);
+ });
+ it('should return a balance of 0 for a non-existent owner address', async () => {
+ const aToken = tokens[0];
+ const aNonExistentOwner = '0x198C6Ad858F213Fb31b6FE809E25040E6B964593';
+ const balance = await zeroEx.token.getBalanceAsync(aToken.address, aNonExistentOwner);
+ const expectedBalance = new BigNumber('0');
+ expect(balance).to.be.bignumber.equal(expectedBalance);
+ });
+ });
+ describe('#getProxyAllowanceAsync', () => {
+ it('should get the proxy allowance', async () => {
+ const aToken = tokens[0];
+ const aOwnerAddress = userAddresses[0];
+
+ const amountInUnits = new BigNumber('50');
+ const amountInBaseUnits = ZeroEx.toBaseUnitAmount(amountInUnits, aToken.decimals);
+ await zeroEx.token.setProxyAllowanceAsync(aToken.address, aOwnerAddress, amountInBaseUnits);
+
+ const allowance = await zeroEx.token.getProxyAllowanceAsync(aToken.address, aOwnerAddress);
+ const expectedAllowance = amountInBaseUnits;
+ expect(allowance).to.be.bignumber.equal(expectedAllowance);
+ });
+ it('should return 0 if no allowance set yet', async () => {
+ const aToken = tokens[0];
+ const aOwnerAddress = userAddresses[0];
+ const allowance = await zeroEx.token.getProxyAllowanceAsync(aToken.address, aOwnerAddress);
+ const expectedAllowance = new BigNumber('0');
+ expect(allowance).to.be.bignumber.equal(expectedAllowance);
+ });
+ });
+ describe('#setProxyAllowanceAsync', () => {
+ it('should set the proxy allowance', async () => {
+ const aToken = tokens[0];
+ const aOwnerAddress = userAddresses[0];
+
+ const allowanceBeforeSet = await zeroEx.token.getProxyAllowanceAsync(aToken.address, aOwnerAddress);
+ const expectedAllowanceBeforeAllowanceSet = new BigNumber('0');
+ expect(allowanceBeforeSet).to.be.bignumber.equal(expectedAllowanceBeforeAllowanceSet);
+
+ const amountInUnits = new BigNumber('50');
+ const amountInBaseUnits = ZeroEx.toBaseUnitAmount(amountInUnits, aToken.decimals);
+ await zeroEx.token.setProxyAllowanceAsync(aToken.address, aOwnerAddress, amountInBaseUnits);
+
+ const allowanceAfterSet = await zeroEx.token.getProxyAllowanceAsync(aToken.address, aOwnerAddress);
+ const expectedAllowanceAfterAllowanceSet = amountInBaseUnits;
+ expect(allowanceAfterSet).to.be.bignumber.equal(expectedAllowanceAfterAllowanceSet);
+ });
+ });
+});
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 23:18:44 +0800