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import { abiUtils, BigNumber } from '@0xproject/utils';
import { Web3Wrapper } from '@0xproject/web3-wrapper';
import {
AbiDefinition,
AbiType,
ConstructorAbi,
ContractAbi,
DataItem,
MethodAbi,
Provider,
TxData,
TxDataPayable,
} from 'ethereum-types';
import * as ethers from 'ethers';
import * as _ from 'lodash';
import { formatABIDataItem } from './utils';
export interface EthersInterfaceByFunctionSignature {
[key: string]: ethers.Interface;
}
const GAS_BUFFER_AMOUNT = 1.1;
export class BaseContract {
protected _ethersInterfacesByFunctionSignature: EthersInterfaceByFunctionSignature;
protected _web3Wrapper: Web3Wrapper;
public abi: ContractAbi;
public address: string;
public contractName: string;
public constructorArgs: any[] = [];
protected static _formatABIDataItemList(
abis: DataItem[],
values: any[],
formatter: (type: string, value: any) => any,
): any {
return _.map(values, (value: any, i: number) => formatABIDataItem(abis[i], value, formatter));
}
protected static _lowercaseAddress(type: string, value: string): string {
return type === 'address' ? value.toLowerCase() : value;
}
protected static _bigNumberToString(type: string, value: any): any {
return _.isObject(value) && value.isBigNumber ? value.toString() : value;
}
protected static _lookupConstructorAbi(abi: ContractAbi): ConstructorAbi {
const constructorAbiIfExists = _.find(
abi,
(abiDefinition: AbiDefinition) => abiDefinition.type === AbiType.Constructor,
) as ConstructorAbi | undefined;
if (!_.isUndefined(constructorAbiIfExists)) {
return constructorAbiIfExists;
} else {
// If the constructor is not explicitly defined, it won't be included in the ABI. It is
// still callable however, so we construct what the ABI would look like were it to exist.
const defaultConstructorAbi: ConstructorAbi = {
type: AbiType.Constructor,
stateMutability: 'nonpayable',
payable: false,
inputs: [],
};
return defaultConstructorAbi;
}
}
protected static _bnToBigNumber(type: string, value: any): any {
return _.isObject(value) && value._bn ? new BigNumber(value.toString()) : value;
}
protected static async _applyDefaultsToTxDataAsync<T extends Partial<TxData | TxDataPayable>>(
txData: T,
txDefaults: Partial<TxData>,
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: TxData = {
...removeUndefinedProperties(txDefaults),
...removeUndefinedProperties(txData as any),
// HACK: TS can't prove that T is spreadable.
// Awaiting https://github.com/Microsoft/TypeScript/pull/13288 to be merged
} as any;
if (_.isUndefined(txDataWithDefaults.gas) && !_.isUndefined(estimateGasAsync)) {
const estimatedGas = await estimateGasAsync(txData);
const buffered = Math.ceil(estimatedGas * GAS_BUFFER_AMOUNT);
txDataWithDefaults.gas = buffered;
}
return txDataWithDefaults;
}
protected _lookupEthersInterface(functionSignature: string): ethers.Interface {
const ethersInterface = this._ethersInterfacesByFunctionSignature[functionSignature];
if (_.isUndefined(ethersInterface)) {
throw new Error(`Failed to lookup method with function signature '${functionSignature}'`);
}
return ethersInterface;
}
protected _lookupAbi(functionSignature: string): MethodAbi {
const methodAbi = _.find(this.abi, (abiDefinition: AbiDefinition) => {
if (abiDefinition.type !== AbiType.Function) {
return false;
}
const abiFunctionSignature = abiUtils.getFunctionSignature(abiDefinition);
if (abiFunctionSignature === functionSignature) {
return true;
}
return false;
}) as MethodAbi;
return methodAbi;
}
constructor(
contractName: string,
abi: ContractAbi,
address: string,
provider: Provider,
txDefaults?: Partial<TxData>,
) {
this.contractName = contractName;
this._web3Wrapper = new Web3Wrapper(provider, txDefaults);
this.abi = abi;
this.address = address;
const methodAbis = this.abi.filter(
(abiDefinition: AbiDefinition) => abiDefinition.type === AbiType.Function,
) as MethodAbi[];
this._ethersInterfacesByFunctionSignature = {};
_.each(methodAbis, methodAbi => {
const functionSignature = abiUtils.getFunctionSignature(methodAbi);
this._ethersInterfacesByFunctionSignature[functionSignature] = new ethers.Interface([methodAbi]);
});
}
}
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