mirror of https://github.com/ethereum/go-ethereum
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/* |
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This file is part of ethereum.js. |
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|
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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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|
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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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|
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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 websocket.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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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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if (process.env.NODE_ENV !== 'build') { |
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var web3 = require('./web3'); // jshint ignore:line
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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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return; |
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} |
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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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self.sendQueue.forEach(function (payload) { |
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self.provider(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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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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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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