115 lines
3.7 KiB
JavaScript
115 lines
3.7 KiB
JavaScript
/*
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This file is part of ethereum.js.
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ethereum.js is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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ethereum.js is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file autoprovider.js
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* @authors:
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* Marek Kotewicz <marek@ethdev.com>
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* Marian Oancea <marian@ethdev.com>
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* @date 2014
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*/
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/*
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* @brief if qt object is available, uses QtProvider,
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* if not tries to connect over websockets
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* if it fails, it uses HttpRpcProvider
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*/
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var web3 = require('./web3'); // jshint ignore:line
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if (process.env.NODE_ENV !== 'build') {
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var WebSocket = require('ws'); // jshint ignore:line
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}
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/**
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* AutoProvider object prototype is implementing 'provider protocol'
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* Automatically tries to setup correct provider(Qt, WebSockets or HttpRpc)
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* First it checkes if we are ethereum browser (if navigator.qt object is available)
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* if yes, we are using QtProvider
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* if no, we check if it is possible to establish websockets connection with ethereum (ws://localhost:40404/eth is default)
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* if it's not possible, we are using httprpc provider (http://localhost:8080)
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* The constructor allows you to specify uris on which we are trying to connect over http or websockets
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* You can do that by passing objects with fields httrpc and websockets
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*/
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var AutoProvider = function (userOptions) {
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if (web3.haveProvider()) {
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return;
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}
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// before we determine what provider we are, we have to cache request
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this.sendQueue = [];
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this.onmessageQueue = [];
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if (navigator.qt) {
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this.provider = new web3.providers.QtProvider();
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return;
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}
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userOptions = userOptions || {};
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var options = {
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httprpc: userOptions.httprpc || 'http://localhost:8080',
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websockets: userOptions.websockets || 'ws://localhost:40404/eth'
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};
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var self = this;
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var closeWithSuccess = function (success) {
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ws.close();
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if (success) {
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self.provider = new web3.providers.WebSocketProvider(options.websockets);
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} else {
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self.provider = new web3.providers.HttpRpcProvider(options.httprpc);
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self.poll = self.provider.poll.bind(self.provider);
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}
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self.sendQueue.forEach(function (payload) {
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self.provider.send(payload);
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});
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self.onmessageQueue.forEach(function (handler) {
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self.provider.onmessage = handler;
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});
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};
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var ws = new WebSocket(options.websockets);
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ws.onopen = function() {
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closeWithSuccess(true);
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};
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ws.onerror = function() {
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closeWithSuccess(false);
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};
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};
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/// Sends message forward to the provider, that is being used
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/// if provider is not yet set, enqueues the message
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AutoProvider.prototype.send = function (payload) {
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if (this.provider) {
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this.provider.send(payload);
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return;
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}
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this.sendQueue.push(payload);
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};
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/// On incoming message sends the message to the provider that is currently being used
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Object.defineProperty(AutoProvider.prototype, 'onmessage', {
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set: function (handler) {
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if (this.provider) {
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this.provider.onmessage = handler;
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return;
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}
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this.onmessageQueue.push(handler);
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}
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});
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module.exports = AutoProvider;
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