Added dutch auction utils to contract-wrappers

packages/contract-wrappers/test/utils/dutch_auction_utils.ts

@@ -0,0 +1,144 @@
+import { DummyERC20TokenContract, DummyERC721TokenContract, ExchangeContract } from '@0x/abi-gen-wrappers';
+import { SignedOrder } from '@0x/types';
+import * as artifacts from '@0x/contract-artifacts';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import { orderFactory } from '@0x/order-utils/lib/src/order_factory';
+
+import { DutchAuctionWrapper } from '../../src/contract_wrappers/dutch_auction_wrapper';
+import { constants } from './constants';
+import { assetDataUtils } from '@0x/order-utils';
+
+export class DutchAuctionUtils {
+    private _web3Wrapper: Web3Wrapper;
+    private _coinbase: string;
+    private _exchangeAddress: string;
+    private _erc20ProxyAddress: string;
+
+    constructor(web3Wrapper: Web3Wrapper, coinbase: string, exchangeAddress: string, erc20ProxyAddress: string) {
+        this._web3Wrapper = web3Wrapper;
+        this._coinbase = coinbase;
+        this._exchangeAddress = exchangeAddress;
+        this._erc20ProxyAddress = erc20ProxyAddress;
+    }
+    public async createSignedSellOrderAsync(
+        auctionBeginTimeSections: BigNumber,
+        auctionBeginAmount: BigNumber,
+        auctionEndAmount: BigNumber,
+        acutionEndTime: BigNumber,
+        makerAssetData: string,
+        takerAssetData: string,
+        makerAddress: string,
+        takerAddress: string,
+        takerFillableAmount: BigNumber,
+        senderAddress?: string,
+        makerFee?: BigNumber,
+        takerFee?: BigNumber,
+        feeRecipientAddress?: string,
+    ): Promise<SignedOrder> {
+        console.log(`asdasd`);
+        const makerAssetAmount = auctionEndAmount;
+        const makerAssetDataWithAuctionDetails = DutchAuctionWrapper.encodeDutchAuctionAssetData(
+            makerAssetData,
+            auctionBeginTimeSections,
+            auctionBeginAmount,
+        );
+        const signedOrder = await orderFactory.createSignedOrderAsync(
+            this._web3Wrapper.getProvider(),
+            makerAddress,
+            makerAssetAmount,
+            makerAssetDataWithAuctionDetails,
+            takerFillableAmount,
+            takerAssetData,
+            this._exchangeAddress,
+            {
+                takerAddress,
+                senderAddress,
+                makerFee,
+                takerFee,
+                feeRecipientAddress,
+                expirationTimeSeconds: acutionEndTime,
+            },
+        );
+        const erc20AssetData = assetDataUtils.decodeERC20AssetData(makerAssetData);
+        await this._increaseERC20BalanceAndAllowanceAsync(erc20AssetData.tokenAddress, makerAddress, makerAssetAmount);
+        return signedOrder;
+    }
+    public async createSignedBuyOrderAsync(
+        sellOrder: SignedOrder,
+        buyerAddress: string,
+        senderAddress?: string,
+        makerFee?: BigNumber,
+        takerFee?: BigNumber,
+        feeRecipientAddress?: string,
+    ): Promise<SignedOrder> {
+        const dutchAuctionData = DutchAuctionWrapper.decodeDutchAuctionData(sellOrder.makerAssetData);
+        const signedOrder = await orderFactory.createSignedOrderAsync(
+            this._web3Wrapper.getProvider(),
+            buyerAddress,
+            dutchAuctionData.beginAmount,
+            sellOrder.takerAssetData,
+            sellOrder.makerAssetAmount,
+            sellOrder.makerAssetData,
+            sellOrder.exchangeAddress,
+            {
+                senderAddress,
+                makerFee,
+                takerFee,
+                feeRecipientAddress,
+                expirationTimeSeconds: sellOrder.expirationTimeSeconds,
+            },
+        );
+        const buyerERC20AssetData = assetDataUtils.decodeERC20AssetData(sellOrder.takerAssetData);
+        await this._increaseERC20BalanceAndAllowanceAsync(
+            buyerERC20AssetData.tokenAddress,
+            buyerAddress,
+            dutchAuctionData.beginAmount,
+        );
+        return signedOrder;
+    }
+    private async _increaseERC20BalanceAndAllowanceAsync(
+        tokenAddress: string,
+        address: string,
+        amount: BigNumber,
+    ): Promise<void> {
+        if (amount.isZero() || address === constants.NULL_ADDRESS) {
+            return; // noop
+        }
+        await Promise.all([
+            this._increaseERC20BalanceAsync(tokenAddress, address, amount),
+            this._increaseERC20AllowanceAsync(tokenAddress, address, amount),
+        ]);
+    }
+    private async _increaseERC20BalanceAsync(tokenAddress: string, address: string, amount: BigNumber): Promise<void> {
+        const erc20Token = new DummyERC20TokenContract(
+            artifacts.DummyERC20Token.compilerOutput.abi,
+            tokenAddress,
+            this._web3Wrapper.getProvider(),
+            this._web3Wrapper.getContractDefaults(),
+        );
+        const txHash = await erc20Token.transfer.sendTransactionAsync(address, amount, {
+            from: this._coinbase,
+        });
+        await this._web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
+    }
+    private async _increaseERC20AllowanceAsync(
+        tokenAddress: string,
+        address: string,
+        amount: BigNumber,
+    ): Promise<void> {
+        const erc20Token = new DummyERC20TokenContract(
+            artifacts.DummyERC20Token.compilerOutput.abi,
+            tokenAddress,
+            this._web3Wrapper.getProvider(),
+            this._web3Wrapper.getContractDefaults(),
+        );
+        const oldMakerAllowance = await erc20Token.allowance.callAsync(address, this._erc20ProxyAddress);
+        const newMakerAllowance = oldMakerAllowance.plus(amount);
+
+        const txHash = await erc20Token.approve.sendTransactionAsync(this._erc20ProxyAddress, newMakerAllowance, {
+            from: address,
+        });
+        await this._web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
+    }
+}