add new blockchain event
This commit is contained in:
Jonathan Rainville
Pascal Precht
parent
0e93e75aba
commit
fe00535bd9
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@ -0,0 +1,359 @@
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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 BlockchainProcessLauncher = require('../processes/blockchainProcessLauncher');
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const utils = require('../utils/utils');
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const constants = require('../constants');
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const WEB3_READY = 'web3Ready';
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class Blockchain {
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constructor(options) {
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this.plugins = options.plugins;
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this.logger = options.logger;
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this.events = options.events;
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this.contractsConfig = options.contractsConfig;
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this.blockchainConfig = options.blockchainConfig;
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this.web3 = options.web3;
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this.locale = options.locale;
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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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this.web3StartedInProcess = false;
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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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}
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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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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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return cb(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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async.waterfall([
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function checkNode(next) {
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self.assertNodeConnection(true, (err) => {
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if (err && self.web3StartedInProcess) {
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// Already started blockchain in another node, we really have a node problem
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self.logger.error(__('Unable to start the blockchain process. Is Geth installed?').red);
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return next(err);
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}
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if (!err) {
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self.isWeb3Ready = true;
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self.events.emit(WEB3_READY);
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// if the ethereum node goes offline, we need a check to ensure
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// the provider is also stopped
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self.events.on('check:wentOffline:Ethereum', () => {
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self.logger.trace('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.trace('Ethereum back online: starting web3 provider...');
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self.provider.startWeb3Provider(() => {
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self.logger.trace('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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return next();
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}
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self.web3StartedInProcess = true;
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self.startBlockchainNode(() => {
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// Need to re-initialize web3 to connect to the new blockchain node
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self.provider.stop();
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self.initWeb3(cb);
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});
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});
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},
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function startProvider(next) {
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self.provider.startWeb3Provider(next);
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},
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function fundAccountsIfNeeded(next) {
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self.provider.fundAccounts(next);
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}
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], (err) => {
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self.registerWeb3Object();
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cb(err);
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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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startBlockchainNode(callback) {
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const self = this;
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let blockchainProcess = new BlockchainProcessLauncher({
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events: self.events,
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logger: self.logger,
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normalizeInput: utils.normalizeInput,
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blockchainConfig: self.blockchainConfig,
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locale: self.locale,
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isDev: self.isDev
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});
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blockchainProcess.startBlockchainNode();
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self.events.once(constants.blockchain.blockchainReady, () => {
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callback();
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});
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self.events.once(constants.blockchain.blockchainExit, () => {
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self.provider.stop();
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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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self.assertNodeConnection(true, (err) => {
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if (err) {
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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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},
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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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return next(null, {name: "Ethereum node (version unknown)", status: 'on'});
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}
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if (version.indexOf("/") < 0) {
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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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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: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: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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this.web3.eth.getGasPrice(cb);
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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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const self = this;
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let hash;
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let calledBacked = false;
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function callback(err, receipt) {
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if (calledBacked) {
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return;
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}
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if (!err && !receipt.contractAddress) {
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return; // Not deployed yet. Need to wait
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}
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if (interval) {
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clearInterval(interval);
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}
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calledBacked = true;
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cb(err, receipt);
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}
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// This interval is there to compensate for the event that sometimes doesn't get triggered when using WebSocket
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// FIXME The issue somehow only happens when the blockchain node is started in the same terminal
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const interval = setInterval(() => {
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if (!hash) {
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return; // Wait until we receive the hash
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}
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self.web3.eth.getTransactionReceipt(hash, (err, receipt) => {
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if (!err && !receipt) {
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return; // Transaction is not yet complete
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}
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callback(err, receipt);
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});
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}, 500);
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deployContractObject.send({
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from: params.from, gas: params.gas, gasPrice: params.gasPrice
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}, function (err, transactionHash) {
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if (err) {
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return callback(err);
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}
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hash = transactionHash;
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})
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.on('receipt', function (receipt) {
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if (receipt.contractAddress !== undefined) {
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callback(null, receipt);
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}
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})
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.then(function (_contract) {
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if (!hash) {
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return; // Somehow we didn't get the receipt yet... Interval will catch it
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}
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self.web3.eth.getTransactionReceipt(hash, callback);
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})
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.catch(callback);
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}
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assertNodeConnection(noLogs, cb) {
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if (typeof noLogs === 'function') {
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cb = noLogs;
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noLogs = false;
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}
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const NO_NODE_ERROR = Error("error connecting to blockchain node");
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const self = this;
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async.waterfall([
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function checkInstance(next) {
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if (!self.web3) {
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return next(Error("no web3 instance found"));
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}
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next();
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},
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function checkProvider(next) {
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if (self.web3.currentProvider === undefined) {
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return next(NO_NODE_ERROR);
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}
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next();
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},
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function pingEndpoint(next) {
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if (!self.contractsConfig || !self.contractsConfig.deployment || !self.contractsConfig.deployment.host) {
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return next();
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}
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const {host, port, type, protocol} = self.contractsConfig.deployment;
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utils.pingEndpoint(host, port, type, protocol, self.blockchainConfig.wsOrigins.split(',')[0], next);
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}
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], function (err) {
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if (!noLogs && err === NO_NODE_ERROR) {
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self.logger.error(("Couldn't connect to an Ethereum node are you sure it's on?").red);
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self.logger.info("make sure you have an Ethereum node or simulator running. e.g 'embark blockchain'".magenta);
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}
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cb(err);
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});
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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);
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}
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}
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module.exports = Blockchain;
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