mirror of https://github.com/embarklabs/embark.git
289 lines
8.6 KiB
JavaScript
289 lines
8.6 KiB
JavaScript
const Web3 = require('web3');
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const async = require('async');
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const Provider = require('./provider.js');
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const utils = require('../../utils/utils');
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const constants = require('../../constants');
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const embarkJsUtils = require('embarkjs').Utils;
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const WEB3_READY = 'web3Ready';
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// TODO: consider another name, this is the blockchain connector
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class BlockchainConnector {
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constructor(embark, options) {
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const self = this;
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this.plugins = options.plugins;
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this.logger = embark.logger;
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this.events = embark.events;
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this.contractsConfig = embark.config.contractsConfig;
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this.blockchainConfig = embark.config.blockchainConfig;
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this.web3 = options.web3;
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this.isDev = options.isDev;
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this.web3Endpoint = '';
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this.isWeb3Ready = false;
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self.events.setCommandHandler("blockchain:web3:isReady", (cb) => {
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cb(self.isWeb3Ready);
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});
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self.events.setCommandHandler("blockchain:object", (cb) => {
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cb(self);
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});
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if (!this.web3) {
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this.initWeb3();
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} else {
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this.isWeb3Ready = true;
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}
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this.registerServiceCheck();
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this.registerRequests();
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this.registerWeb3Object();
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this.registerEvents();
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this.subscribeToPendingTransactions();
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}
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//initWeb3() {
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initWeb3(cb) {
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if (!cb) {
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cb = function(){};
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}
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if (this.isWeb3Ready) {
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this.events.emit(WEB3_READY);
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return cb();
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}
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const self = this;
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this.web3 = new Web3();
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if (this.contractsConfig.deployment.type !== "rpc" && this.contractsConfig.deployment.type !== "ws") {
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const message = __("contracts config error: unknown deployment type %s", this.contractsConfig.deployment.type);
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this.logger.error(message);
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}
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const protocol = (this.contractsConfig.deployment.type === "rpc") ? this.contractsConfig.deployment.protocol : 'ws';
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this.web3Endpoint = utils.buildUrl(protocol, this.contractsConfig.deployment.host, this.contractsConfig.deployment.port);//`${protocol}://${this.contractsConfig.deployment.host}:${this.contractsConfig.deployment.port}`;
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const providerOptions = {
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web3: this.web3,
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accountsConfig: this.contractsConfig.deployment.accounts,
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blockchainConfig: this.blockchainConfig,
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logger: this.logger,
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isDev: this.isDev,
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type: this.contractsConfig.deployment.type,
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web3Endpoint: self.web3Endpoint
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};
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this.provider = new Provider(providerOptions);
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self.events.request("processes:launch", "blockchain", () => {
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self.provider.startWeb3Provider(() => {
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this.getNetworkId()
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.then(id => {
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let networkId = self.blockchainConfig.networkId;
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if (!networkId && constants.blockchain.networkIds[self.blockchainConfig.networkType]) {
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networkId = constants.blockchain.networkIds[self.blockchainConfig.networkType];
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}
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if (networkId && id.toString() !== networkId.toString()) {
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self.logger.warn(__('Connected to a blockchain node on network {{realId}} while your config specifies {{configId}}', {realId: id, configId: networkId}));
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self.logger.warn(__('Make sure you started the right blockchain node'));
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}
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})
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.catch(console.error);
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self.provider.fundAccounts(() => {
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self.isWeb3Ready = true;
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self.events.emit(WEB3_READY);
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self.registerWeb3Object();
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});
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});
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});
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}
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registerEvents() {
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const self = this;
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self.events.on('check:wentOffline:Ethereum', () => {
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self.logger.warn('Ethereum went offline: stopping web3 provider...');
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self.provider.stop();
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// once the node goes back online, we can restart the provider
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self.events.once('check:backOnline:Ethereum', () => {
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self.logger.warn('Ethereum back online: starting web3 provider...');
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self.provider.startWeb3Provider(() => {
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self.logger.warn('web3 provider restarted after ethereum node came back online');
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});
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});
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});
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}
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onReady(callback) {
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if (this.isWeb3Ready) {
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return callback();
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}
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this.events.once(WEB3_READY, () => {
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callback();
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});
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}
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registerServiceCheck() {
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const self = this;
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const NO_NODE = 'noNode';
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this.events.request("services:register", 'Ethereum', function (cb) {
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async.waterfall([
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function checkNodeConnection(next) {
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if (!self.web3.currentProvider) {
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return next(NO_NODE, {name: "No Blockchain node found", status: 'off'});
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}
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next();
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},
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function checkVersion(next) {
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// TODO: web3_clientVersion method is currently not implemented in web3.js 1.0
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self.web3._requestManager.send({method: 'web3_clientVersion', params: []}, (err, version) => {
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if (err) {
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self.isWeb3Ready = false;
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return next(null, {name: "Ethereum node not found", status: 'off'});
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}
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if (version.indexOf("/") < 0) {
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self.events.emit(WEB3_READY);
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self.isWeb3Ready = true;
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return next(null, {name: version, status: 'on'});
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}
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let nodeName = version.split("/")[0];
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let versionNumber = version.split("/")[1].split("-")[0];
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let name = nodeName + " " + versionNumber + " (Ethereum)";
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self.events.emit(WEB3_READY);
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self.isWeb3Ready = true;
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return next(null, {name: name, status: 'on'});
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});
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}
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], (err, statusObj) => {
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if (err && err !== NO_NODE) {
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return cb(err);
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}
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cb(statusObj);
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});
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}, 5000, 'off');
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}
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registerRequests() {
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const self = this;
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this.events.setCommandHandler("blockchain:get", function(cb) {
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cb(self.web3);
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});
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this.events.setCommandHandler("blockchain:defaultAccount:get", function(cb) {
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cb(self.defaultAccount());
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});
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this.events.setCommandHandler("blockchain:defaultAccount:set", function(account, cb) {
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self.setDefaultAccount(account);
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cb();
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});
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this.events.setCommandHandler("blockchain:block:byNumber", function(blockNumber, cb) {
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self.getBlock(blockNumber, cb);
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});
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this.events.setCommandHandler("blockchain:gasPrice", function(cb) {
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self.getGasPrice(cb);
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});
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this.events.setCommandHandler("blockchain:networkId", function(cb) {
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self.getNetworkId().then(cb);
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});
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this.events.setCommandHandler("blockchain:contract:create", function(params, cb) {
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cb(self.ContractObject(params));
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});
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}
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defaultAccount() {
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return this.web3.eth.defaultAccount;
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}
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setDefaultAccount(account) {
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this.web3.eth.defaultAccount = account;
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}
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getAccounts(cb) {
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this.web3.eth.getAccounts(cb);
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}
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getCode(address, cb) {
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this.web3.eth.getCode(address, cb);
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}
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getBlock(blockNumber, cb) {
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this.web3.eth.getBlock(blockNumber, cb);
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}
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getGasPrice(cb) {
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const self = this;
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this.onReady(() => {
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self.web3.eth.getGasPrice(cb);
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});
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}
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getNetworkId() {
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return this.web3.eth.net.getId();
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}
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ContractObject(params) {
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return new this.web3.eth.Contract(params.abi, params.address);
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}
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deployContractObject(contractObject, params) {
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return contractObject.deploy({arguments: params.arguments, data: params.data});
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}
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estimateDeployContractGas(deployObject, cb) {
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return deployObject.estimateGas().then((gasValue) => {
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cb(null, gasValue);
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}).catch(cb);
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}
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deployContractFromObject(deployContractObject, params, cb) {
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embarkJsUtils.secureSend(this.web3, deployContractObject, {
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from: params.from, gas: params.gas, gasPrice: params.gasPrice
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}, true, cb);
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}
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determineDefaultAccount(cb) {
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const self = this;
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self.getAccounts(function(err, accounts) {
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if (err) {
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self.logger.error(err);
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return cb(new Error(err));
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}
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let accountConfig = self.blockchainConfig.account;
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let selectedAccount = accountConfig && accountConfig.address;
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self.setDefaultAccount(selectedAccount || accounts[0]);
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cb();
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});
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}
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registerWeb3Object() {
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// doesn't feel quite right, should be a cmd or plugin method
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// can just be a command without a callback
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this.events.emit("runcode:register", "web3", this.web3, false);
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}
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subscribeToPendingTransactions() {
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const self = this;
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this.onReady(() => {
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if (self.logsSubscription) {
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self.logsSubscription.unsubscribe();
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}
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self.logsSubscription = self.web3.eth
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.subscribe('newBlockHeaders', () => {})
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.on("data", function (blockHeader) {
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self.events.emit('block:header', blockHeader);
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});
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});
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}
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}
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module.exports = BlockchainConnector;
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