100 lines
2.5 KiB
JavaScript
100 lines
2.5 KiB
JavaScript
const ProviderEngine = require('web3-provider-engine');
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const RpcSubprovider = require('web3-provider-engine/subproviders/rpc.js');
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const async = require('async');
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const AccountParser = require('./accountParser');
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const fundAccount = require('./fundAccount');
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const NO_ACCOUNTS = 'noAccounts';
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class Provider {
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constructor(options) {
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this.web3 = options.web3;
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this.accountsConfig = options.accountsConfig;
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this.web3Endpoint = options.web3Endpoint;
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this.logger = options.logger;
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this.isDev = options.isDev;
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this.engine = new ProviderEngine();
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this.asyncMethods = {};
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}
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startWeb3Provider(callback) {
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const self = this;
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self.engine.addProvider(new RpcSubprovider({
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rpcUrl: self.web3Endpoint
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}));
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// network connectivity error
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self.engine.on('error', (err) => {
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// report connectivity errors
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self.logger.error(err.stack);
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});
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self.engine.start();
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self.web3.setProvider(self);
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self.accounts = AccountParser.parseAccountsConfig(self.accountsConfig, self.web3, self.logger);
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self.addresses = [];
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async.waterfall([
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function populateWeb3Wallet(next) {
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if (!self.accounts.length) {
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return next(NO_ACCOUNTS);
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}
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self.accounts.forEach(account => {
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self.addresses.push(account.address);
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self.web3.eth.accounts.wallet.add(account);
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});
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self.asyncMethods = {
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eth_accounts: self.eth_accounts.bind(self)
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};
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next();
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}
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], function (err) {
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if (err && err !== NO_ACCOUNTS) {
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self.logger.error((err));
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}
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callback();
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});
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}
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fundAccounts(callback) {
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const self = this;
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if (!self.accounts.length) {
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return callback();
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}
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if (!self.isDev) {
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return callback();
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}
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async.each(self.accounts, (account, eachCb) => {
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fundAccount(self.web3, account.address, eachCb);
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}, callback);
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}
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stop() {
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this.engine.stop();
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}
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eth_accounts(payload, cb) {
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return cb(null, this.addresses);
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}
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sendAsync(payload, callback) {
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let method = this.asyncMethods[payload.method];
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if (method) {
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return method.call(method, payload, (err, result) => {
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if (err) {
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return callback(err);
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}
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let response = {'id': payload.id, 'jsonrpc': '2.0', 'result': result};
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callback(null, response);
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});
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}
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this.engine.sendAsync.apply(this.engine, arguments);
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}
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send() {
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return this.engine.send.apply(this.engine, arguments);
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}
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}
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module.exports = Provider;
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