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import * as _ from 'lodash';
import * as BigNumber from 'bignumber.js';
import {Web3Wrapper} from '../web3_wrapper';
import {ECSignature, ZeroExError, ExchangeContract} from '../types';
import {assert} from '../utils/assert';
import {ContractWrapper} from './contract_wrapper';
import * as ExchangeArtifacts from '../artifacts/Exchange.json';
import {ecSignatureSchema} from '../schemas/ec_signature_schema';
export class ExchangeWrapper extends ContractWrapper {
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);
assert.doesConformToSchema('ecSignature', ecSignature, ecSignatureSchema);
assert.isETHAddressHex('signerAddressHex', signerAddressHex);
const senderAddressIfExists = await this.web3Wrapper.getSenderAddressIfExistsAsync();
assert.assert(!_.isUndefined(senderAddressIfExists), ZeroExError.USER_HAS_NO_ASSOCIATED_ADDRESSES);
const exchangeContract = await this.getExchangeContractAsync();
const isValidSignature = await exchangeContract.isValidSignature.call(
signerAddressHex,
dataHex,
ecSignature.v,
ecSignature.r,
ecSignature.s,
{
from: senderAddressIfExists,
},
);
return isValidSignature;
}
/**
* Returns the unavailable takerAmount of an order. Unavailable amount is defined as the total
* amount that has been filled or cancelled. The remaining takerAmount can be calculated by
* subtracting the unavailable amount from the total order takerAmount.
*/
public async getUnavailableTakerAmountAsync(orderHashHex: string): Promise<BigNumber.BigNumber> {
assert.isValidOrderHash('orderHashHex', orderHashHex);
const exchangeContract = await this.getExchangeContractAsync();
const unavailableAmountInBaseUnits = await exchangeContract.getUnavailableValueT.call(orderHashHex);
return unavailableAmountInBaseUnits;
}
/**
* Retrieve the takerAmount of an order that has already been filled.
*/
public async getFilledTakerAmountAsync(orderHashHex: string): Promise<BigNumber.BigNumber> {
assert.isValidOrderHash('orderHashHex', orderHashHex);
const exchangeContract = await this.getExchangeContractAsync();
const fillAmountInBaseUnits = await exchangeContract.filled.call(orderHashHex);
return fillAmountInBaseUnits;
}
/**
* Retrieve the takerAmount of an order that has been cancelled.
*/
public async getCanceledTakerAmountAsync(orderHashHex: string): Promise<BigNumber.BigNumber> {
assert.isValidOrderHash('orderHashHex', orderHashHex);
const exchangeContract = await this.getExchangeContractAsync();
const cancelledAmountInBaseUnits = await exchangeContract.cancelled.call(orderHashHex);
return cancelledAmountInBaseUnits;
}
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;
}
}
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