118 lines
4.8 KiB
JavaScript
118 lines
4.8 KiB
JavaScript
let utils = require('../../utils/utils.js');
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let fs = require('../../core/fs.js');
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let Web3 = require('web3');
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const {canonicalHost, defaultHost} = require('../../utils/host');
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class Whisper {
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constructor(embark, _options) {
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this.logger = embark.logger;
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this.events = embark.events;
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this.communicationConfig = embark.config.communicationConfig;
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this.web3 = new Web3();
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this.embark = embark;
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if (!this.communicationConfig.enabled) {
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return;
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}
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this.connectToProvider();
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this.setServiceCheck();
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this.addWhisperToEmbarkJS();
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this.addSetProvider();
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}
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connectToProvider() {
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let {host, port} = this.communicationConfig.connection;
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let web3Endpoint = 'ws://' + host + ':' + port;
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// Note: dont't pass to the provider things like {headers: {Origin: "embark"}}. Origin header is for browser to fill
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// to protect user, it has no meaning if it is used server-side. See here for more details: https://github.com/ethereum/go-ethereum/issues/16608
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// Moreover, Parity reject origins that are not urls so if you try to connect with Origin: "embark" it gives the followin error:
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// << Blocked connection to WebSockets server from untrusted origin: Some("embark") >>
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// The best choice is to use void origin, BUT Geth rejects void origin, so to keep both clients happy we can use http://embark
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this.web3.setProvider(new Web3.providers.WebsocketProvider(web3Endpoint, {headers: {Origin: "http://embark"}}));
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}
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setServiceCheck() {
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const self = this;
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self.events.request("services:register", 'Whisper', function(cb) {
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if (!self.web3.currentProvider || self.web3.currentProvider.connection.readyState !== 1) {
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return self.connectToProvider();
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}
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// 1) Parity does not implement shh_version JSON-RPC method
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// 2) web3 1.0 still does not implement web3_clientVersion
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// so we must do all by our own
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self.web3._requestManager.send({method: 'web3_clientVersion', params: []}, (err, clientVersion) => {
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if (err) return cb(err);
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if (clientVersion.indexOf("Parity-Ethereum//v2") === 0) {
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// This is Parity
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return self.web3.shh.getInfo(function(err) {
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if (err) {
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return cb({name: 'Whisper', status: 'off'});
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}
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// TOFIX Assume Whisper v6 until there's a way to understand it via JSON-RPC
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return cb({name: 'Whisper (version 6)', status: 'on'});
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});
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}
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// Assume it is a Geth compliant client
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self.web3.shh.getVersion(function(err, version) {
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if (err || version == "2") {
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return cb({name: 'Whisper', status: 'off'});
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}
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return cb({name: 'Whisper (version ' + version + ')', status: 'on'});
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});
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});
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});
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}
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addWhisperToEmbarkJS() {
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const self = this;
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// TODO: make this a shouldAdd condition
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if (this.communicationConfig === {}) {
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return;
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}
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if ((this.communicationConfig.available_providers.indexOf('whisper') < 0) && (this.communicationConfig.provider !== 'whisper' || this.communicationConfig.enabled !== true)) {
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return;
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}
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// TODO: possible race condition could be a concern
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this.events.request("version:get:web3", function(web3Version) {
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let code = "";
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code += "\n" + fs.readFileSync(utils.joinPath(__dirname, 'js', 'message_events.js')).toString();
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if (web3Version[0] === "0") {
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code += "\n" + fs.readFileSync(utils.joinPath(__dirname, 'js', 'embarkjs_old_web3.js')).toString();
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code += "\nEmbarkJS.Messages.registerProvider('whisper', __embarkWhisperOld);";
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} else {
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code += "\n" + fs.readFileSync(utils.joinPath(__dirname, 'js', 'embarkjs.js')).toString();
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code += "\nEmbarkJS.Messages.registerProvider('whisper', __embarkWhisperNewWeb3);";
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}
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self.embark.addCodeToEmbarkJS(code);
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});
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}
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addSetProvider() {
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let connection = this.communicationConfig.connection || {};
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const shouldInit = (communicationConfig) => {
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return (communicationConfig.provider === 'whisper' && communicationConfig.enabled === true);
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};
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// todo: make the add code a function as well
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const config = {
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server: canonicalHost(connection.host || defaultHost),
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port: connection.port || '8546',
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type: connection.type || 'ws'
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};
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const code = `\nEmbarkJS.Messages.setProvider('whisper', ${JSON.stringify(config)});`;
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this.embark.addProviderInit('communication', code, shouldInit);
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const consoleConfig = Object.assign({}, config, {providerOptions: {headers: {Origin: "http://embark"}}});
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const consoleCode = `\nEmbarkJS.Messages.setProvider('whisper', ${JSON.stringify(consoleConfig)});`;
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this.embark.addConsoleProviderInit('communication', consoleCode, shouldInit);
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}
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}
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module.exports = Whisper;
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