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Diffstat (limited to 'packages/contract-wrappers/src/contract_wrappers/dutch_auction_wrapper.ts')
-rw-r--r-- | packages/contract-wrappers/src/contract_wrappers/dutch_auction_wrapper.ts | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/packages/contract-wrappers/src/contract_wrappers/dutch_auction_wrapper.ts b/packages/contract-wrappers/src/contract_wrappers/dutch_auction_wrapper.ts new file mode 100644 index 000000000..500e7a63d --- /dev/null +++ b/packages/contract-wrappers/src/contract_wrappers/dutch_auction_wrapper.ts @@ -0,0 +1,151 @@ +import { artifacts as protocolArtifacts } from '@0x/contracts-protocol'; +import { DutchAuctionContract } from '@0x/abi-gen-wrappers'; +import { DutchAuction } from '@0x/contract-artifacts'; +import { LogDecoder } from '@0x/contracts-test-utils'; +import { artifacts as tokensArtifacts } from '@0x/contracts-tokens'; +import { _getDefaultContractAddresses } from '../utils/contract_addresses'; +import { DutchAuctionDetails, SignedOrder } from '@0x/types'; +import { ContractAbi } from 'ethereum-types'; +import { Web3Wrapper } from '@0x/web3-wrapper'; +import { BigNumber } from '@0x/utils'; +import { Provider, TransactionReceiptWithDecodedLogs } from 'ethereum-types'; +import * as _ from 'lodash'; +import ethAbi = require('ethereumjs-abi'); +import { schemas } from '@0x/json-schemas'; +import { assert } from '../utils/assert'; +import ethUtil = require('ethereumjs-util'); + +import { orderTxOptsSchema } from '../schemas/order_tx_opts_schema'; +import { txOptsSchema } from '../schemas/tx_opts_schema'; +import { OrderTransactionOpts } from '../types'; +import { ContractWrapper } from './contract_wrapper'; +import { ExchangeWrapperError } from '../types'; + +export class DutchAuctionWrapper extends ContractWrapper { + public abi: ContractAbi = DutchAuction.compilerOutput.abi; + public address: string; + private _dutchAuctionContractIfExists?: DutchAuctionContract; + /** + * Instantiate DutchAuctionWrapper + * @param web3Wrapper Web3Wrapper instance to use. + * @param networkId Desired networkId. + * @param address The address of the Dutch Auction contract. If undefined, will + * default to the known address corresponding to the networkId. + */ + constructor( + web3Wrapper: Web3Wrapper, + networkId: number, + address: string, + ) { + super(web3Wrapper, networkId); + this.address = address; + } + /** + * Matches the buy and sell orders at an amount given the following: the current block time, the auction + * start time and the auction begin amount. The sell order is a an order at the lowest amount + * at the end of the auction. Excess from the match is transferred to the seller. + * Over time the price moves from beginAmount to endAmount given the current block.timestamp. + * @param buyOrder The Buyer's order. This order is for the current expected price of the auction. + * @param sellOrder The Seller's order. This order is for the lowest amount (at the end of the auction). + * @param from Address the transaction is being sent from. + * @return Transaction receipt with decoded logs. + */ + public async matchOrdersAsync( + buyOrder: SignedOrder, + sellOrder: SignedOrder, + takerAddress: string, + orderTransactionOpts: OrderTransactionOpts = { shouldValidate: true }, + ): Promise<string> { + // type assertions + assert.doesConformToSchema('buyOrder', buyOrder, schemas.signedOrderSchema); + assert.doesConformToSchema('sellOrder', sellOrder, schemas.signedOrderSchema); + await assert.isSenderAddressAsync('takerAddress', takerAddress, this._web3Wrapper); + assert.doesConformToSchema('orderTransactionOpts', orderTransactionOpts, orderTxOptsSchema, [txOptsSchema]); + const normalizedTakerAddress = takerAddress.toLowerCase(); + // other assertions + if ( + sellOrder.makerAssetData !== buyOrder.takerAssetData || + sellOrder.takerAssetData !== buyOrder.makerAssetData + ) { + throw new Error(ExchangeWrapperError.AssetDataMismatch); + } + // get contract + const dutchAuctionInstance = await this._getDutchAuctionContractAsync(); + // validate transaction + if (orderTransactionOpts.shouldValidate) { + await dutchAuctionInstance.matchOrders.callAsync( + buyOrder, + sellOrder, + buyOrder.signature, + sellOrder.signature, + { + from: normalizedTakerAddress, + gas: orderTransactionOpts.gasLimit, + gasPrice: orderTransactionOpts.gasPrice, + nonce: orderTransactionOpts.nonce, + }, + ); + } + // send transaction + const txHash = await dutchAuctionInstance.matchOrders.sendTransactionAsync( + buyOrder, + sellOrder, + buyOrder.signature, + sellOrder.signature, + { + from: normalizedTakerAddress, + gas: orderTransactionOpts.gasLimit, + gasPrice: orderTransactionOpts.gasPrice, + nonce: orderTransactionOpts.nonce, + }, + ); + return txHash; + } + /** + * Calculates the Auction Details for the given order + * @param sellOrder The Seller's order. This order is for the lowest amount (at the end of the auction). + * @return The dutch auction details. + */ + public async getAuctionDetailsAsync(sellOrder: SignedOrder): Promise<DutchAuctionDetails> { + // type assertions + assert.doesConformToSchema('sellOrder', sellOrder, schemas.signedOrderSchema); + // get contract + const dutchAuctionInstance = await this._getDutchAuctionContractAsync(); + // call contract + const afterAuctionDetails = await dutchAuctionInstance.getAuctionDetails.callAsync(sellOrder); + return afterAuctionDetails; + } + private async _getDutchAuctionContractAsync(): Promise<DutchAuctionContract> { + if (!_.isUndefined(this._dutchAuctionContractIfExists)) { + return this._dutchAuctionContractIfExists; + } + const contractInstance = new DutchAuctionContract( + this.abi, + this.address, + this._web3Wrapper.getProvider(), + this._web3Wrapper.getContractDefaults(), + ); + this._dutchAuctionContractIfExists = contractInstance; + return this._dutchAuctionContractIfExists; + } + /** + * Dutch auction details are encoded with the asset data for a 0x order. This function produces a hex + * encoded assetData string, containing information both about the asset being traded and the + * dutch auction; which is usable in the makerAssetData or takerAssetData fields in a 0x order. + * @param assetData Hex encoded assetData string for the asset being auctioned. + * @param beginTimeSeconds Begin time of the dutch auction. + * @param beginAmount Starting amount being sold in the dutch auction. + * @return The hex encoded assetData string. + */ + public static encodeDutchAuctionAssetData(assetData: string, beginTimeSeconds: BigNumber, beginAmount: BigNumber): string { + const assetDataBuffer = ethUtil.toBuffer(assetData); + const abiEncodedAuctionData = (ethAbi as any).rawEncode( + ['uint256', 'uint256'], + [beginTimeSeconds.toString(), beginAmount.toString()], + ); + const abiEncodedAuctionDataBuffer = ethUtil.toBuffer(abiEncodedAuctionData); + const dutchAuctionDataBuffer = Buffer.concat([assetDataBuffer, abiEncodedAuctionDataBuffer]); + const dutchAuctionData = ethUtil.bufferToHex(dutchAuctionDataBuffer); + return dutchAuctionData; + }; +} |