web3.js/lib/httpprovider.js

/*
    This file is part of ethereum.js.

    ethereum.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.

    ethereum.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 ethereum.js.  If not, see <http://www.gnu.org/licenses/>.
*/
/** @file httpprovider.js
 * @authors:
 *   Marek Kotewicz <marek@ethdev.com>
 *   Marian Oancea <marian@ethdev.com>
 * @date 2014
 */

if (process.env.NODE_ENV !== 'build') {
        var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest; // jshint ignore:line
}

var HttpProvider = function (host) {
    this.handlers = [];
    this.host = host || 'http://localhost:8080';
};

HttpProvider.prototype.send = function (payload, callback) {
    var request = new XMLHttpRequest();
    request.open('POST', this.host, false);

    // ASYNC
    if(typeof callback === 'function') {
        request.onreadystatechange = function() {
            if(request.readyState === 4 && request.status === 200) {
                callback(JSON.parse(request.responseText));
            }
        };

        request.open('POST', this.host, true);
        request.send(JSON.stringify(payload));

    // SYNC
    } else {
        request.open('POST', this.host, false);
        request.send(JSON.stringify(payload));

        // check request.status
        if(request.status !== 200)
            return;
        return JSON.parse(request.responseText);
        
    }
};

module.exports = HttpProvider;