mirror of https://github.com/embarklabs/embark.git
add new blockchain event
This commit is contained in:
Jonathan Rainville
Pascal Precht
parent
0e93e75aba
commit
fe00535bd9
|
|
@ -0,0 +1,359 @@
|
|||
const Web3 = require('web3');
|
||||
const async = require('async');
|
||||
const Provider = require('./provider.js');
|
||||
const BlockchainProcessLauncher = require('../processes/blockchainProcessLauncher');
|
||||
const utils = require('../utils/utils');
|
||||
const constants = require('../constants');
|
||||
|
||||
const WEB3_READY = 'web3Ready';
|
||||
|
||||
class Blockchain {
|
||||
constructor(options) {
|
||||
this.plugins = options.plugins;
|
||||
this.logger = options.logger;
|
||||
this.events = options.events;
|
||||
this.contractsConfig = options.contractsConfig;
|
||||
this.blockchainConfig = options.blockchainConfig;
|
||||
this.web3 = options.web3;
|
||||
this.locale = options.locale;
|
||||
this.isDev = options.isDev;
|
||||
this.web3Endpoint = '';
|
||||
this.isWeb3Ready = false;
|
||||
this.web3StartedInProcess = false;
|
||||
|
||||
if (!this.web3) {
|
||||
this.initWeb3();
|
||||
} else {
|
||||
this.isWeb3Ready = true;
|
||||
}
|
||||
this.registerServiceCheck();
|
||||
this.registerRequests();
|
||||
this.registerWeb3Object();
|
||||
}
|
||||
|
||||
initWeb3(cb) {
|
||||
if (!cb) {
|
||||
cb = function(){};
|
||||
}
|
||||
if (this.isWeb3Ready) {
|
||||
return cb();
|
||||
}
|
||||
const self = this;
|
||||
this.web3 = new Web3();
|
||||
|
||||
if (this.contractsConfig.deployment.type !== "rpc" && this.contractsConfig.deployment.type !== "ws") {
|
||||
const message = __("contracts config error: unknown deployment type %s", this.contractsConfig.deployment.type);
|
||||
this.logger.error(message);
|
||||
return cb(message);
|
||||
}
|
||||
|
||||
const protocol = (this.contractsConfig.deployment.type === "rpc") ? this.contractsConfig.deployment.protocol : 'ws';
|
||||
|
||||
this.web3Endpoint = utils.buildUrl(protocol, this.contractsConfig.deployment.host, this.contractsConfig.deployment.port);//`${protocol}://${this.contractsConfig.deployment.host}:${this.contractsConfig.deployment.port}`;
|
||||
|
||||
const providerOptions = {
|
||||
web3: this.web3,
|
||||
accountsConfig: this.contractsConfig.deployment.accounts,
|
||||
blockchainConfig: this.blockchainConfig,
|
||||
logger: this.logger,
|
||||
isDev: this.isDev,
|
||||
type: this.contractsConfig.deployment.type,
|
||||
web3Endpoint: self.web3Endpoint
|
||||
};
|
||||
this.provider = new Provider(providerOptions);
|
||||
|
||||
async.waterfall([
|
||||
function checkNode(next) {
|
||||
self.assertNodeConnection(true, (err) => {
|
||||
if (err && self.web3StartedInProcess) {
|
||||
// Already started blockchain in another node, we really have a node problem
|
||||
self.logger.error(__('Unable to start the blockchain process. Is Geth installed?').red);
|
||||
return next(err);
|
||||
}
|
||||
if (!err) {
|
||||
self.isWeb3Ready = true;
|
||||
self.events.emit(WEB3_READY);
|
||||
// if the ethereum node goes offline, we need a check to ensure
|
||||
// the provider is also stopped
|
||||
self.events.on('check:wentOffline:Ethereum', () => {
|
||||
self.logger.trace('Ethereum went offline: stopping web3 provider...');
|
||||
self.provider.stop();
|
||||
|
||||
// once the node goes back online, we can restart the provider
|
||||
self.events.once('check:backOnline:Ethereum', () => {
|
||||
self.logger.trace('Ethereum back online: starting web3 provider...');
|
||||
self.provider.startWeb3Provider(() => {
|
||||
self.logger.trace('web3 provider restarted after ethereum node came back online');
|
||||
});
|
||||
});
|
||||
});
|
||||
return next();
|
||||
}
|
||||
self.web3StartedInProcess = true;
|
||||
self.startBlockchainNode(() => {
|
||||
// Need to re-initialize web3 to connect to the new blockchain node
|
||||
self.provider.stop();
|
||||
self.initWeb3(cb);
|
||||
});
|
||||
});
|
||||
},
|
||||
function startProvider(next) {
|
||||
self.provider.startWeb3Provider(next);
|
||||
},
|
||||
function fundAccountsIfNeeded(next) {
|
||||
self.provider.fundAccounts(next);
|
||||
}
|
||||
], (err) => {
|
||||
self.registerWeb3Object();
|
||||
cb(err);
|
||||
});
|
||||
}
|
||||
|
||||
onReady(callback) {
|
||||
if (this.isWeb3Ready) {
|
||||
return callback();
|
||||
}
|
||||
|
||||
this.events.once(WEB3_READY, () => {
|
||||
callback();
|
||||
});
|
||||
}
|
||||
|
||||
startBlockchainNode(callback) {
|
||||
const self = this;
|
||||
let blockchainProcess = new BlockchainProcessLauncher({
|
||||
events: self.events,
|
||||
logger: self.logger,
|
||||
normalizeInput: utils.normalizeInput,
|
||||
blockchainConfig: self.blockchainConfig,
|
||||
locale: self.locale,
|
||||
isDev: self.isDev
|
||||
});
|
||||
|
||||
blockchainProcess.startBlockchainNode();
|
||||
self.events.once(constants.blockchain.blockchainReady, () => {
|
||||
callback();
|
||||
});
|
||||
self.events.once(constants.blockchain.blockchainExit, () => {
|
||||
self.provider.stop();
|
||||
callback();
|
||||
});
|
||||
}
|
||||
|
||||
registerServiceCheck() {
|
||||
const self = this;
|
||||
const NO_NODE = 'noNode';
|
||||
|
||||
this.events.request("services:register", 'Ethereum', function (cb) {
|
||||
async.waterfall([
|
||||
function checkNodeConnection(next) {
|
||||
self.assertNodeConnection(true, (err) => {
|
||||
if (err) {
|
||||
return next(NO_NODE, {name: "No Blockchain node found", status: 'off'});
|
||||
}
|
||||
next();
|
||||
});
|
||||
},
|
||||
function checkVersion(next) {
|
||||
// TODO: web3_clientVersion method is currently not implemented in web3.js 1.0
|
||||
self.web3._requestManager.send({method: 'web3_clientVersion', params: []}, (err, version) => {
|
||||
if (err) {
|
||||
return next(null, {name: "Ethereum node (version unknown)", status: 'on'});
|
||||
}
|
||||
if (version.indexOf("/") < 0) {
|
||||
return next(null, {name: version, status: 'on'});
|
||||
}
|
||||
let nodeName = version.split("/")[0];
|
||||
let versionNumber = version.split("/")[1].split("-")[0];
|
||||
let name = nodeName + " " + versionNumber + " (Ethereum)";
|
||||
|
||||
return next(null, {name: name, status: 'on'});
|
||||
});
|
||||
}
|
||||
], (err, statusObj) => {
|
||||
if (err && err !== NO_NODE) {
|
||||
return cb(err);
|
||||
}
|
||||
cb(statusObj);
|
||||
});
|
||||
}, 5000, 'off');
|
||||
}
|
||||
|
||||
registerRequests() {
|
||||
const self = this;
|
||||
|
||||
this.events.setCommandHandler("blockchain:defaultAccount:get", function(cb) {
|
||||
cb(self.defaultAccount());
|
||||
});
|
||||
|
||||
this.events.setCommandHandler("blockchain:defaultAccount:set", function(account, cb) {
|
||||
self.setDefaultAccount(account);
|
||||
cb();
|
||||
});
|
||||
|
||||
this.events.setCommandHandler("blockchain:block:byNumber", function(blockNumber, cb) {
|
||||
self.getBlock(blockNumber, cb);
|
||||
});
|
||||
|
||||
this.events.setCommandHandler("blockchain:gasPrice", function(cb) {
|
||||
self.getGasPrice(cb);
|
||||
});
|
||||
|
||||
this.events.setCommandHandler("blockchain:contract:create", function(params, cb) {
|
||||
cb(self.ContractObject(params));
|
||||
});
|
||||
}
|
||||
|
||||
defaultAccount() {
|
||||
return this.web3.eth.defaultAccount;
|
||||
}
|
||||
|
||||
setDefaultAccount(account) {
|
||||
this.web3.eth.defaultAccount = account;
|
||||
}
|
||||
|
||||
getAccounts(cb) {
|
||||
this.web3.eth.getAccounts(cb);
|
||||
}
|
||||
|
||||
getCode(address, cb) {
|
||||
this.web3.eth.getCode(address, cb);
|
||||
}
|
||||
|
||||
getBlock(blockNumber, cb) {
|
||||
this.web3.eth.getBlock(blockNumber, cb);
|
||||
}
|
||||
|
||||
getGasPrice(cb) {
|
||||
this.web3.eth.getGasPrice(cb);
|
||||
}
|
||||
|
||||
ContractObject(params) {
|
||||
return new this.web3.eth.Contract(params.abi, params.address);
|
||||
}
|
||||
|
||||
deployContractObject(contractObject, params) {
|
||||
return contractObject.deploy({arguments: params.arguments, data: params.data});
|
||||
}
|
||||
|
||||
estimateDeployContractGas(deployObject, cb) {
|
||||
return deployObject.estimateGas().then((gasValue) => {
|
||||
cb(null, gasValue);
|
||||
}).catch(cb);
|
||||
}
|
||||
|
||||
deployContractFromObject(deployContractObject, params, cb) {
|
||||
const self = this;
|
||||
let hash;
|
||||
let calledBacked = false;
|
||||
|
||||
function callback(err, receipt) {
|
||||
if (calledBacked) {
|
||||
return;
|
||||
}
|
||||
if (!err && !receipt.contractAddress) {
|
||||
return; // Not deployed yet. Need to wait
|
||||
}
|
||||
if (interval) {
|
||||
clearInterval(interval);
|
||||
}
|
||||
calledBacked = true;
|
||||
cb(err, receipt);
|
||||
}
|
||||
|
||||
// This interval is there to compensate for the event that sometimes doesn't get triggered when using WebSocket
|
||||
// FIXME The issue somehow only happens when the blockchain node is started in the same terminal
|
||||
const interval = setInterval(() => {
|
||||
if (!hash) {
|
||||
return; // Wait until we receive the hash
|
||||
}
|
||||
self.web3.eth.getTransactionReceipt(hash, (err, receipt) => {
|
||||
if (!err && !receipt) {
|
||||
return; // Transaction is not yet complete
|
||||
}
|
||||
callback(err, receipt);
|
||||
});
|
||||
}, 500);
|
||||
|
||||
deployContractObject.send({
|
||||
from: params.from, gas: params.gas, gasPrice: params.gasPrice
|
||||
}, function (err, transactionHash) {
|
||||
if (err) {
|
||||
return callback(err);
|
||||
}
|
||||
hash = transactionHash;
|
||||
})
|
||||
.on('receipt', function (receipt) {
|
||||
if (receipt.contractAddress !== undefined) {
|
||||
callback(null, receipt);
|
||||
}
|
||||
})
|
||||
.then(function (_contract) {
|
||||
if (!hash) {
|
||||
return; // Somehow we didn't get the receipt yet... Interval will catch it
|
||||
}
|
||||
self.web3.eth.getTransactionReceipt(hash, callback);
|
||||
})
|
||||
.catch(callback);
|
||||
}
|
||||
|
||||
assertNodeConnection(noLogs, cb) {
|
||||
if (typeof noLogs === 'function') {
|
||||
cb = noLogs;
|
||||
noLogs = false;
|
||||
}
|
||||
const NO_NODE_ERROR = Error("error connecting to blockchain node");
|
||||
const self = this;
|
||||
|
||||
async.waterfall([
|
||||
function checkInstance(next) {
|
||||
if (!self.web3) {
|
||||
return next(Error("no web3 instance found"));
|
||||
}
|
||||
next();
|
||||
},
|
||||
function checkProvider(next) {
|
||||
if (self.web3.currentProvider === undefined) {
|
||||
return next(NO_NODE_ERROR);
|
||||
}
|
||||
next();
|
||||
},
|
||||
function pingEndpoint(next) {
|
||||
if (!self.contractsConfig || !self.contractsConfig.deployment || !self.contractsConfig.deployment.host) {
|
||||
return next();
|
||||
}
|
||||
const {host, port, type, protocol} = self.contractsConfig.deployment;
|
||||
utils.pingEndpoint(host, port, type, protocol, self.blockchainConfig.wsOrigins.split(',')[0], next);
|
||||
}
|
||||
], function (err) {
|
||||
if (!noLogs && err === NO_NODE_ERROR) {
|
||||
self.logger.error(("Couldn't connect to an Ethereum node are you sure it's on?").red);
|
||||
self.logger.info("make sure you have an Ethereum node or simulator running. e.g 'embark blockchain'".magenta);
|
||||
}
|
||||
cb(err);
|
||||
});
|
||||
}
|
||||
|
||||
determineDefaultAccount(cb) {
|
||||
const self = this;
|
||||
self.getAccounts(function (err, accounts) {
|
||||
if (err) {
|
||||
self.logger.error(err);
|
||||
return cb(new Error(err));
|
||||
}
|
||||
let accountConfig = self.blockchainConfig.account;
|
||||
let selectedAccount = accountConfig && accountConfig.address;
|
||||
self.setDefaultAccount(selectedAccount || accounts[0]);
|
||||
cb();
|
||||
});
|
||||
}
|
||||
|
||||
registerWeb3Object() {
|
||||
// doesn't feel quite right, should be a cmd or plugin method
|
||||
// can just be a command without a callback
|
||||
this.events.emit("runcode:register", "web3", this.web3);
|
||||
}
|
||||
}
|
||||
|
||||
module.exports = Blockchain;
|
||||
|
||||
Loading…
Reference in New Issue