All files / web3-providers-http/src index.js

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/*
    This file is part of web3.js.
 
    web3.js is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    web3.js is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public License
    along with web3.js.  If not, see <http://www.gnu.org/licenses/>.
*/
/** @file httpprovider.js
 * @authors:
 *   Marek Kotewicz <marek@parity.io>
 *   Marian Oancea
 *   Fabian Vogelsteller <fabian@ethereum.org>
 * @date 2015
 */
 
var errors = require('web3-core-helpers').errors;
var XHR2 = require('xhr2');
 
/**
 * HttpProvider should be used to send rpc calls over http
 */
var HttpProvider = function HttpProvider(host, timeout) {
    this.host = host || 'http://localhost:8545';
    this.timeout = timeout || 0;
    this.connected = false;
};
 
 
/**
 * Should be used to make async request
 *
 * @method send
 * @param {Object} payload
 * @param {Function} callback triggered on end with (err, result)
 */
HttpProvider.prototype.send = function (payload, callback) {
    var _this = this;
    var request = new XHR2();
 
    request.open('POST', this.host, true);
    request.setRequestHeader('Content-Type','application/json');
 
    request.onreadystatechange = function() {
        if (request.readyState === 4 && request.timeout !== 1) {
            var result = request.responseText;
            var error = null;
 
            try {
                result = JSON.parse(result);
            } catch(e) {
                error = errors.InvalidResponse(request.responseText);
            }
 
            _this.connected = true;
            callback(error, result);
        }
    };
 
    request.ontimeout = function() {
        _this.connected = false;
        callback(errors.ConnectionTimeout(this.timeout));
    };
 
    try {
        request.send(JSON.stringify(payload));
    } catch(error) {
        this.connected = false;
        callback(errors.InvalidConnection(this.host));
    }
};
 
 
module.exports = HttpProvider;