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-rw-r--r--packages/deployer/src/utils/contract.ts81
1 files changed, 81 insertions, 0 deletions
diff --git a/packages/deployer/src/utils/contract.ts b/packages/deployer/src/utils/contract.ts
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+++ b/packages/deployer/src/utils/contract.ts
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+import { schemas, SchemaValidator } from '@0xproject/json-schemas';
+import { promisify } from '@0xproject/utils';
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+
+import { AbiType } from './types';
+
+export class Contract implements Web3.ContractInstance {
+ public address: string;
+ public abi: Web3.ContractAbi;
+ private _contract: Web3.ContractInstance;
+ private _defaults: Partial<Web3.TxData>;
+ private _validator: SchemaValidator;
+ // This class instance is going to be populated with functions and events depending on the ABI
+ // and we don't know their types in advance
+ [name: string]: any;
+ constructor(web3ContractInstance: Web3.ContractInstance, defaults: Partial<Web3.TxData>) {
+ this._contract = web3ContractInstance;
+ this.address = web3ContractInstance.address;
+ this.abi = web3ContractInstance.abi;
+ this._defaults = defaults;
+ this._populateEvents();
+ this._populateFunctions();
+ this._validator = new SchemaValidator();
+ }
+ private _populateFunctions(): void {
+ const functionsAbi = _.filter(this.abi, abiPart => abiPart.type === AbiType.Function) as Web3.FunctionAbi[];
+ _.forEach(functionsAbi, (functionAbi: Web3.MethodAbi) => {
+ if (functionAbi.constant) {
+ const cbStyleCallFunction = this._contract[functionAbi.name].call;
+ this[functionAbi.name] = {
+ callAsync: promisify(cbStyleCallFunction, this._contract),
+ };
+ } else {
+ const cbStyleFunction = this._contract[functionAbi.name];
+ const cbStyleEstimateGasFunction = this._contract[functionAbi.name].estimateGas;
+ this[functionAbi.name] = {
+ estimateGasAsync: promisify(cbStyleEstimateGasFunction, this._contract),
+ sendTransactionAsync: this._promisifyWithDefaultParams(cbStyleFunction),
+ };
+ }
+ });
+ }
+ private _populateEvents(): void {
+ const eventsAbi = _.filter(this.abi, abiPart => abiPart.type === AbiType.Event) as Web3.EventAbi[];
+ _.forEach(eventsAbi, (eventAbi: Web3.EventAbi) => {
+ this[eventAbi.name] = this._contract[eventAbi.name];
+ });
+ }
+ private _promisifyWithDefaultParams(fn: (...args: any[]) => void): (...args: any[]) => Promise<any> {
+ const promisifiedWithDefaultParams = async (...args: any[]) => {
+ const promise = new Promise((resolve, reject) => {
+ const lastArg = args[args.length - 1];
+ let txData: Partial<Web3.TxData> = {};
+ if (this._isTxData(lastArg)) {
+ txData = args.pop();
+ }
+ txData = {
+ ...this._defaults,
+ ...txData,
+ };
+ const callback = (err: Error, data: any) => {
+ if (_.isNull(err)) {
+ resolve(data);
+ } else {
+ reject(err);
+ }
+ };
+ args.push(txData);
+ args.push(callback);
+ fn.apply(this._contract, args);
+ });
+ return promise;
+ };
+ return promisifiedWithDefaultParams;
+ }
+ private _isTxData(lastArg: any): boolean {
+ const isValid = this._validator.isValid(lastArg, schemas.txDataSchema);
+ return isValid;
+ }
+}