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import { TxData, TxDataPayable } from '@0xproject/types';
import * as ethersContracts from 'ethers-contracts';
import * as _ from 'lodash';
import * as Web3 from 'web3';
import { Web3Wrapper } from './web3_wrapper';
export class BaseContract {
protected _ethersInterface: ethersContracts.Interface;
protected _web3Wrapper: Web3Wrapper;
public abi: Web3.ContractAbi;
public address: string;
protected static _transformABIData(
abis: Web3.DataItem[],
values: any[],
transformation: (type: string, value: any) => any,
): any {
return _.map(values, (value: any, i: number) =>
BaseContract._transformTypedData(abis[i].type, value, transformation),
);
}
protected static _lowercaseAddress(type: string, value: string): string {
return type === 'address' ? value.toLowerCase() : value;
}
protected static _bigNumberToString(type: string, value: string): string {
return _.isObject(value) && (value as any).isBigNumber ? value.toString() : value;
}
private static _transformTypedData(
type: string,
values: any,
transformation: (type: string, value: any) => any,
): any {
const trailingArrayRegex = /\[\d*\]$/;
if (type.match(trailingArrayRegex)) {
const arrayItemType = type.replace(trailingArrayRegex, '');
return _.map(values, value => this._transformTypedData(arrayItemType, value, transformation));
} else {
return transformation(type, values);
}
}
protected async _applyDefaultsToTxDataAsync<T extends Partial<TxData | TxDataPayable>>(
txData: T,
estimateGasAsync?: (txData: T) => Promise<number>,
): Promise<TxData> {
// Gas amount sourced with the following priorities:
// 1. Optional param passed in to public method call
// 2. Global config passed in at library instantiation
// 3. Gas estimate calculation + safety margin
const removeUndefinedProperties = _.pickBy;
const txDataWithDefaults = {
to: this.address,
...removeUndefinedProperties(this._web3Wrapper.getContractDefaults()),
...removeUndefinedProperties(txData as any),
// HACK: TS can't prove that T is spreadable.
// Awaiting https://github.com/Microsoft/TypeScript/pull/13288 to be merged
};
if (_.isUndefined(txDataWithDefaults.gas) && !_.isUndefined(estimateGasAsync)) {
const estimatedGas = await estimateGasAsync(txData);
txDataWithDefaults.gas = estimatedGas;
}
return txDataWithDefaults;
}
constructor(web3Wrapper: Web3Wrapper, abi: Web3.ContractAbi, address: string) {
this._web3Wrapper = web3Wrapper;
this.abi = abi;
this.address = address;
this._ethersInterface = new ethersContracts.Interface(abi);
}
}
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