Code coverage report for web3/lib/web3/httpprovider.js

Statements: 83.72% (36 / 43)      Branches: 58.33% (7 / 12)      Functions: 100% (6 / 6)      Lines: 83.72% (36 / 43)      Ignored: none     

All files » web3/lib/web3/ » httpprovider.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@ethdev.com>
 *   Marian Oancea <marian@ethdev.com>
 *   Fabian Vogelsteller <fabian@ethdev.com>
 * @date 2015
 */
 
"use strict";
 
var errors = require('./errors');
 
// workaround to use httpprovider in different envs
var XMLHttpRequest; // jshint ignore: line
 
// meteor server environment
Iif (typeof Meteor !== 'undefined' && Meteor.isServer) { // jshint ignore: line
    XMLHttpRequest = Npm.require('xmlhttprequest').XMLHttpRequest; // jshint ignore: line
 
// browser
} else Iif (typeof window !== 'undefined' && window.XMLHttpRequest) {
    XMLHttpRequest = window.XMLHttpRequest; // jshint ignore: line
 
// node
} else {
    XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest; // jshint ignore: line
}
 
/**
 * HttpProvider should be used to send rpc calls over http
 */
var HttpProvider = function (host) {
    this.host = host || 'http://localhost:8545';
};
 
/**
 * Should be called to prepare new XMLHttpRequest
 *
 * @method prepareRequest
 * @param {Boolean} true if request should be async
 * @return {XMLHttpRequest} object
 */
HttpProvider.prototype.prepareRequest = function (async) {
    var request = new XMLHttpRequest();
    request.open('POST', this.host, async);
    request.setRequestHeader('Content-Type','application/json');
    return request;
};
 
/**
 * Should be called to make sync request
 *
 * @method send
 * @param {Object} payload
 * @return {Object} result
 */
HttpProvider.prototype.send = function (payload) {
    var request = this.prepareRequest(false);
 
    try {
        request.send(JSON.stringify(payload));
    } catch(error) {
        throw errors.InvalidConnection(this.host);
    }
 
    var result = request.responseText;
 
    try {
        result = JSON.parse(result);
    } catch(e) {
        throw errors.InvalidResponse(request.responseText);                
    }
 
    return result;
};
 
/**
 * Should be used to make async request
 *
 * @method sendAsync
 * @param {Object} payload
 * @param {Function} callback triggered on end with (err, result)
 */
HttpProvider.prototype.sendAsync = function (payload, callback) {
    var request = this.prepareRequest(true); 
 
    request.onreadystatechange = function() {
        Eif (request.readyState === 4) {
            var result = request.responseText;
            var error = null;
 
            try {
                result = JSON.parse(result);
            } catch(e) {
                error = errors.InvalidResponse(request.responseText);                
            }
 
            callback(error, result);
        }
    };
    
    try {
        request.send(JSON.stringify(payload));
    } catch(error) {
        callback(errors.InvalidConnection(this.host));
    }
};
 
/**
 * Synchronously tries to make Http request
 *
 * @method isConnected
 * @return {Boolean} returns true if request haven't failed. Otherwise false
 */
HttpProvider.prototype.isConnected = function() {
    try {
        this.send({
            id: 9999999999,
            jsonrpc: '2.0',
            method: 'net_listening',
            params: []
        });
        return true;
    } catch(e) {
        return false;
    }
};
 
module.exports = HttpProvider;