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authorFabio Berger <me@fabioberger.com>2017-11-13 11:17:18 +0800
committerFabio Berger <me@fabioberger.com>2017-11-13 11:17:18 +0800
commitc4ee2d73865a1444c079b9e2836b7630a0adf03e (patch)
treeb9c7794e7022fb189675d914f5fe58dcabd67dec /src/contract.ts
parenta74ec0effa818a86233fe64cb0dad2c61bbb4bb6 (diff)
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Switch over to Lerna + Yarn Workspaces setup for a mono-repo approach
Diffstat (limited to 'src/contract.ts')
-rw-r--r--src/contract.ts80
1 files changed, 0 insertions, 80 deletions
diff --git a/src/contract.ts b/src/contract.ts
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--- a/src/contract.ts
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-import * as Web3 from 'web3';
-import * as _ from 'lodash';
-import promisify = require('es6-promisify');
-import {SchemaValidator, schemas} from '0x-json-schemas';
-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);
- _.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);
- _.forEach(eventsAbi, (eventAbi: Web3.EventAbi) => {
- this[eventAbi.name] = this.contract[eventAbi.name];
- });
- }
- private promisifyWithDefaultParams(fn: (...args: any[]) => void): (...args: any[]) => Promise<any> {
- const promisifiedWithDefaultParams = (...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;
- }
-}