Merge branch 'master' into fillOrderAsync

10 files changed, 191 insertions, 13 deletions

diff --git a/src/0x.js.ts b/src/0x.js.ts
index d708a8db6..69c0cc567 100644
--- a/src/0x.js.ts
+++ b/src/0x.js.ts
@@ -11,14 +11,16 @@ import {assert} from './utils/assert';
 import findVersions = require('find-versions');
 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 {SolidityTypes, ECSignature, ZeroExError} from './types';
 
 const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
 
 export class ZeroEx {
-    public web3Wrapper: Web3Wrapper;
     public exchange: ExchangeWrapper;
+    public tokenRegistry: TokenRegistryWrapper;
+    private web3Wrapper: Web3Wrapper;
     /**
      * Computes the orderHash given the order parameters and returns it as a hex encoded string.
      */
@@ -132,6 +134,15 @@ export class ZeroEx {
     constructor(web3: Web3) {
         this.web3Wrapper = new Web3Wrapper(web3);
         this.exchange = new ExchangeWrapper(this.web3Wrapper);
+        this.tokenRegistry = new TokenRegistryWrapper(this.web3Wrapper);
+    }
+    /**
+     * Sets a new provider for the web3 instance used by 0x.js
+     */
+    public setProvider(provider: Web3.Provider) {
+        this.web3Wrapper.setProvider(provider);
+        this.exchange.invalidateContractInstance();
+        this.tokenRegistry.invalidateContractInstance();
     }
     /**
      * Signs an orderHash and returns it's elliptic curve signature
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 7a80c5800..66e53a7d4 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -26,9 +26,13 @@ export class ExchangeWrapper extends ContractWrapper {
         [ExchangeContractErrs.ERROR_FILL_TRUNCATION]: 'The rounding error was too large when filling this order',
         [ExchangeContractErrs.ERROR_FILL_BALANCE_ALLOWANCE]: 'Maker or taker has insufficient balance or allowance',
     };
+    private exchangeContractIfExists?: ExchangeContract;
     constructor(web3Wrapper: Web3Wrapper) {
         super(web3Wrapper);
     }
+    public invalidateContractInstance(): void {
+        delete this.exchangeContractIfExists;
+    }
     public async isValidSignatureAsync(dataHex: string, ecSignature: ECSignature,
                                        signerAddressHex: string): Promise<boolean> {
         assert.isHexString('dataHex', dataHex);
@@ -36,7 +40,7 @@ export class ExchangeWrapper extends ContractWrapper {
         assert.isETHAddressHex('signerAddressHex', signerAddressHex);
 
         const senderAddress = await this.web3Wrapper.getSenderAddressOrThrowAsync();
-        const exchangeInstance = await this.getExchangeInstanceOrThrowAsync();
+        const exchangeInstance = await this.getExchangeContractAsync();
 
         const isValidSignature = await exchangeInstance.isValidSignature.call(
             signerAddressHex,
@@ -102,4 +106,12 @@ export class ExchangeWrapper extends ContractWrapper {
             throw new Error(humanReadableErrMessage);
         }
     }
+    private async getExchangeContractAsync(): Promise<ExchangeContract> {
+        if (!_.isUndefined(this.exchangeContractIfExists)) {
+            return this.exchangeContractIfExists;
+        }
+        const contractInstance = await this.instantiateContractIfExistsAsync((ExchangeArtifacts as any));
+        this.exchangeContractIfExists = contractInstance as ExchangeContract;
+        return this.exchangeContractIfExists;
+    }
 }
diff --git a/src/contract_wrappers/token_registry_wrapper.ts b/src/contract_wrappers/token_registry_wrapper.ts
new file mode 100644
index 000000000..86bea1c5d
--- /dev/null
+++ b/src/contract_wrappers/token_registry_wrapper.ts
@@ -0,0 +1,44 @@
+import * as _ from 'lodash';
+import {Web3Wrapper} from '../web3_wrapper';
+import {Token, TokenRegistryContract, TokenMetadata} from '../types';
+import {assert} from '../utils/assert';
+import {ContractWrapper} from './contract_wrapper';
+import * as TokenRegistryArtifacts from '../artifacts/TokenRegistry.json';
+
+export class TokenRegistryWrapper extends ContractWrapper {
+    private tokenRegistryContractIfExists?: TokenRegistryContract;
+    constructor(web3Wrapper: Web3Wrapper) {
+        super(web3Wrapper);
+    }
+    public invalidateContractInstance(): void {
+        delete this.tokenRegistryContractIfExists;
+    }
+    public async getTokensAsync(): Promise<Token[]> {
+        const tokenRegistryContract = await this.getTokenRegistryContractAsync();
+
+        const addresses = await tokenRegistryContract.getTokenAddresses.call();
+        const tokenMetadataPromises: Array<Promise<TokenMetadata>> = _.map(
+            addresses,
+            (address: string) => (tokenRegistryContract.getTokenMetaData.call(address)),
+        );
+        const tokensMetadata = await Promise.all(tokenMetadataPromises);
+        const tokens = _.map(tokensMetadata, metadata => {
+            return {
+                address: metadata[0],
+                name: metadata[1],
+                symbol: metadata[2],
+                url: metadata[3],
+                decimals: metadata[4].toNumber(),
+            };
+        });
+        return tokens;
+    }
+    private async getTokenRegistryContractAsync(): Promise<TokenRegistryContract> {
+        if (!_.isUndefined(this.tokenRegistryContractIfExists)) {
+            return this.tokenRegistryContractIfExists;
+        }
+        const contractInstance = await this.instantiateContractIfExistsAsync((TokenRegistryArtifacts as any));
+        this.tokenRegistryContractIfExists = contractInstance as TokenRegistryContract;
+        return this.tokenRegistryContractIfExists;
+    }
+}
diff --git a/src/schemas/token_schema.ts b/src/schemas/token_schema.ts
new file mode 100644
index 000000000..01702af68
--- /dev/null
+++ b/src/schemas/token_schema.ts
@@ -0,0 +1,12 @@
+export const tokenSchema = {
+    id: '/token',
+    properties: {
+        name: {type: 'string'},
+        symbol: {type: 'string'},
+        decimals: {type: 'number'},
+        address: {type: 'string'},
+        url: {type: 'string'},
+    },
+    required: ['name', 'symbol', 'decimals', 'address', 'url'],
+    type: 'object',
+};
diff --git a/src/types.ts b/src/types.ts
index 327293cc6..2ada20e3c 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -45,6 +45,15 @@ export interface ExchangeContract {
     ) => ContractResponse;
 }
 
+export interface TokenRegistryContract {
+    getTokenMetaData: {
+        call: (address: string) => Promise<TokenMetadata>;
+    };
+    getTokenAddresses: {
+        call: () => Promise<string[]>;
+    };
+}
+
 export const SolidityTypes = strEnum([
     'address',
     'uint256',
@@ -90,3 +99,14 @@ export interface Order {
 export interface SignedOrder extends Order {
     ecSignature: ECSignature;
 }
+
+//                          [address, name, symbol, projectUrl, decimals, ipfsHash, swarmHash]
+export type TokenMetadata = [string, string, string, string, BigNumber.BigNumber, string, string];
+
+export interface Token {
+    name: string;
+    address: string;
+    symbol: string;
+    decimals: number;
+    url: string;
+}
diff --git a/src/utils/schema_validator.ts b/src/utils/schema_validator.ts
index 5b2c4aaa5..cf45d0343 100644
--- a/src/utils/schema_validator.ts
+++ b/src/utils/schema_validator.ts
@@ -1,11 +1,13 @@
 import {Validator, ValidatorResult} from 'jsonschema';
 import {ecSignatureSchema, ecSignatureParameter} from '../schemas/ec_signature_schema';
 import {addressSchema, numberSchema, orderSchema, signedOrderSchema} from '../schemas/signed_order_schema';
+import {tokenSchema} from '../schemas/token_schema';
 
 export class SchemaValidator {
     private validator: Validator;
     constructor() {
         this.validator = new Validator();
+        this.validator.addSchema(tokenSchema, tokenSchema.id);
         this.validator.addSchema(orderSchema, orderSchema.id);
         this.validator.addSchema(numberSchema, numberSchema.id);
         this.validator.addSchema(addressSchema, addressSchema.id);
diff --git a/src/web3_wrapper.ts b/src/web3_wrapper.ts
index 1ed1c0b29..361f28476 100644
--- a/src/web3_wrapper.ts
+++ b/src/web3_wrapper.ts
@@ -11,6 +11,9 @@ export class Web3Wrapper {
         this.web3 = new Web3();
         this.web3.setProvider(web3.currentProvider);
     }
+    public setProvider(provider: Web3.Provider) {
+        this.web3.setProvider(provider);
+    }
     public isAddress(address: string): boolean {
         return this.web3.isAddress(address);
     }
@@ -56,10 +59,9 @@ export class Web3Wrapper {
     }
     public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
         const code = await promisify(this.web3.eth.getCode)(address);
-        // Regex matches 0x0, 0x00, 0x in order to accomodate poorly implemented clients
-        const zeroHexAddressRegex = /^0x0*$/i;
-        const didFindCode = _.isNull(code.match(zeroHexAddressRegex));
-        return didFindCode;
+        // Regex matches 0x0, 0x00, 0x in order to accommodate poorly implemented clients
+        const codeIsEmpty = /^0x0{0,40}$/i.test(code);
+        return !codeIsEmpty;
     }
     public async signTransactionAsync(address: string, message: string): Promise<string> {
         const signData = await promisify(this.web3.eth.sign)(address, message);
diff --git a/test/0x.js_test.ts b/test/0x.js_test.ts
index bb312a00f..5d23d7094 100644
--- a/test/0x.js_test.ts
+++ b/test/0x.js_test.ts
@@ -13,6 +13,34 @@ chai.use(ChaiBigNumber());
 const expect = chai.expect;
 
 describe('ZeroEx library', () => {
+    describe('#setProvider', () => {
+        it('overrides the provider in the nested web3 instance and invalidates contractInstances', async () => {
+            const web3 = web3Factory.create();
+            const zeroEx = new ZeroEx(web3);
+            // Instantiate the contract instances with the current provider
+            await (zeroEx.exchange as any).getExchangeContractAsync();
+            await (zeroEx.tokenRegistry as any).getTokenRegistryContractAsync();
+            expect((zeroEx.exchange as any).exchangeContractIfExists).to.not.be.undefined;
+            expect((zeroEx.tokenRegistry as any).tokenRegistryContractIfExists).to.not.be.undefined;
+
+            const newProvider = web3Factory.getRpcProvider();
+            // Add property to newProvider so that we can differentiate it from old provider
+            (newProvider as any).zeroExTestId = 1;
+            zeroEx.setProvider(newProvider);
+
+            // Check that contractInstances with old provider are removed after provider update
+            expect((zeroEx.exchange as any).exchangeContractIfExists).to.be.undefined;
+            expect((zeroEx.tokenRegistry as any).tokenRegistryContractIfExists).to.be.undefined;
+
+            // Check that all nested web3 instances return the updated provider
+            const nestedWeb3WrapperProvider = (zeroEx as any).web3Wrapper.getCurrentProvider();
+            expect((nestedWeb3WrapperProvider as any).zeroExTestId).to.be.a('number');
+            const exchangeWeb3WrapperProvider = zeroEx.exchange.web3Wrapper.getCurrentProvider();
+            expect((exchangeWeb3WrapperProvider as any).zeroExTestId).to.be.a('number');
+            const tokenRegistryWeb3WrapperProvider = zeroEx.tokenRegistry.web3Wrapper.getCurrentProvider();
+            expect((tokenRegistryWeb3WrapperProvider as any).zeroExTestId).to.be.a('number');
+        });
+    });
     describe('#getOrderHash', () => {
         const expectedOrderHash = '0x103a5e97dab5dbeb8f385636f86a7d1e458a7ccbe1bd194727f0b2f85ab116c7';
         it('defaults takerAddress to NULL address', () => {
@@ -194,9 +222,9 @@ describe('ZeroEx library', () => {
             const web3 = web3Factory.create();
             const zeroEx = new ZeroEx(web3);
             stubs = [
-                Sinon.stub(zeroEx.web3Wrapper, 'getNodeVersionAsync')
+                Sinon.stub((zeroEx as any).web3Wrapper, 'getNodeVersionAsync')
                     .returns(Promise.resolve(newParityNodeVersion)),
-                Sinon.stub(zeroEx.web3Wrapper, 'signTransactionAsync')
+                Sinon.stub((zeroEx as any).web3Wrapper, 'signTransactionAsync')
                     .returns(Promise.resolve(signature)),
                 Sinon.stub(ZeroEx, 'isValidSignature').returns(true),
             ];
@@ -218,9 +246,9 @@ describe('ZeroEx library', () => {
             const web3 = web3Factory.create();
             const zeroEx = new ZeroEx(web3);
             stubs = [
-                Sinon.stub(zeroEx.web3Wrapper, 'getNodeVersionAsync')
+                Sinon.stub((zeroEx as any).web3Wrapper, 'getNodeVersionAsync')
                     .returns(Promise.resolve(newParityNodeVersion)),
-                Sinon.stub(zeroEx.web3Wrapper, 'signTransactionAsync')
+                Sinon.stub((zeroEx as any).web3Wrapper, 'signTransactionAsync')
                     .returns(Promise.resolve(signature)),
                 Sinon.stub(ZeroEx, 'isValidSignature').returns(true),
             ];
diff --git a/test/token_registry_wrapper_test.ts b/test/token_registry_wrapper_test.ts
new file mode 100644
index 000000000..c91555d8b
--- /dev/null
+++ b/test/token_registry_wrapper_test.ts
@@ -0,0 +1,43 @@
+import * as _ from 'lodash';
+import 'mocha';
+import * as chai from 'chai';
+import chaiAsPromised = require('chai-as-promised');
+import * as Web3 from 'web3';
+import {web3Factory} from './utils/web3_factory';
+import {ZeroEx} from '../src/0x.js';
+import {BlockchainLifecycle} from './utils/blockchain_lifecycle';
+import {Token} from '../src/types';
+import {SchemaValidator} from '../src/utils/schema_validator';
+import {tokenSchema} from '../src/schemas/token_schema';
+
+const expect = chai.expect;
+chai.use(chaiAsPromised);
+const blockchainLifecycle = new BlockchainLifecycle();
+
+const TOKEN_REGISTRY_SIZE_AFTER_MIGRATION = 7;
+
+describe('TokenRegistryWrapper', () => {
+    let zeroEx: ZeroEx;
+    before(async () => {
+        const web3 = web3Factory.create();
+        zeroEx = new ZeroEx(web3);
+    });
+    beforeEach(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    afterEach(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    describe('#getTokensAsync', () => {
+        it('should return all the tokens added to the tokenRegistry during the migration', async () => {
+            const tokens = await zeroEx.tokenRegistry.getTokensAsync();
+            expect(tokens).to.have.lengthOf(TOKEN_REGISTRY_SIZE_AFTER_MIGRATION);
+
+            const schemaValidator = new SchemaValidator();
+            _.each(tokens, token => {
+                const validationResult = schemaValidator.validate(token, tokenSchema);
+                expect(validationResult.errors).to.have.lengthOf(0);
+            });
+        });
+    });
+});
diff --git a/test/utils/web3_factory.ts b/test/utils/web3_factory.ts
index 493fbc2df..ffdc0e4cf 100644
--- a/test/utils/web3_factory.ts
+++ b/test/utils/web3_factory.ts
@@ -10,14 +10,18 @@ import {constants} from './constants';
 
 export const web3Factory = {
     create(): Web3 {
+        const provider = this.getRpcProvider();
+        const web3 = new Web3();
+        web3.setProvider(provider);
+        return web3;
+    },
+    getRpcProvider(): Web3.Provider {
         const provider = new ProviderEngine();
         const rpcUrl = `http://${constants.RPC_HOST}:${constants.RPC_PORT}`;
         provider.addProvider(new RpcSubprovider({
             rpcUrl,
         }));
         provider.start();
-        const web3 = new Web3();
-        web3.setProvider(provider);
-        return web3;
+        return provider;
     },
 };