112 lines
3.1 KiB
JavaScript
112 lines
3.1 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 httpprovider.js
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* @authors:
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* Marek Kotewicz <[email protected]>
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* Marian Oancea <[email protected]>
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* Fabian Vogelsteller <[email protected]>
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* @date 2015
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*/
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"use strict";
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var XMLHttpRequest = (typeof window !== 'undefined' && window.XMLHttpRequest) ? window.XMLHttpRequest : require('xmlhttprequest').XMLHttpRequest; // jshint ignore:line
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var errors = require('./errors');
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var HttpProvider = function (host) {
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this.host = host || 'http://localhost:8545';
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};
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HttpProvider.prototype.isConnected = function() {
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var request = new XMLHttpRequest();
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request.open('POST', this.host, false);
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request.setRequestHeader('Content-Type','application/json');
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try {
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request.send(JSON.stringify({
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id: 9999999999,
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jsonrpc: '2.0',
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method: 'net_listening',
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params: []
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}));
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return true;
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} catch(e) {
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return false;
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}
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};
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HttpProvider.prototype.send = function (payload) {
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var request = new XMLHttpRequest();
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request.open('POST', this.host, false);
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request.setRequestHeader('Content-Type','application/json');
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try {
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request.send(JSON.stringify(payload));
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} catch(error) {
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throw errors.InvalidConnection(this.host);
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}
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// check request.status
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// TODO: throw an error here! it cannot silently fail!!!
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//if (request.status !== 200) {
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//return;
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//}
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var result = request.responseText;
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try {
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result = JSON.parse(result);
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} catch(e) {
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throw errors.InvalidResponse(request.responseText);
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}
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return result;
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};
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HttpProvider.prototype.sendAsync = function (payload, callback) {
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var request = new XMLHttpRequest();
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request.onreadystatechange = function() {
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if (request.readyState === 4) {
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var result = request.responseText;
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var error = null;
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try {
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result = JSON.parse(result);
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} catch(e) {
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error = errors.InvalidResponse(request.responseText);
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}
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callback(error, result);
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}
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};
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request.open('POST', this.host, true);
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request.setRequestHeader('Content-Type','application/json');
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try {
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request.send(JSON.stringify(payload));
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} catch(error) {
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callback(errors.InvalidConnection(this.host));
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}
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};
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module.exports = HttpProvider;
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