147 lines
3.8 KiB
JavaScript
Executable File
147 lines
3.8 KiB
JavaScript
Executable File
/*
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This file is part of web3.js.
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web3.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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web3.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 web3.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 errors = require('web3/lib/web3/errors');
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// workaround to use httpprovider in different envs
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var XMLHttpRequest; // jshint ignore: line
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// browser
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if (typeof window !== 'undefined' && window.XMLHttpRequest) {
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XMLHttpRequest = window.XMLHttpRequest; // jshint ignore: line
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// node
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} else {
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XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest; // jshint ignore: line
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}
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/**
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* HttpProvider should be used to send rpc calls over http
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*/
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var HttpProvider = function (host, user, pass) {
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this.host = host || 'http://localhost:8545';
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this.authorizationHeader = 'Basic ' + (new Buffer(user + ':' + pass)).toString('base64');
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this.user = user;
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this.pass = pass;
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};
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/**
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* Should be called to prepare new XMLHttpRequest
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*
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* @method prepareRequest
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* @param {Boolean} true if request should be async
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* @return {XMLHttpRequest} object
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*/
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HttpProvider.prototype.prepareRequest = function (async) {
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var request = new XMLHttpRequest();
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request.open('POST', this.host, async);
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request.setRequestHeader('Content-Type','application/json');
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request.setRequestHeader('Authorization', this.authorizationHeader);
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return request;
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};
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/**
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* Should be called to make sync request
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*
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* @method send
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* @param {Object} payload
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* @return {Object} result
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*/
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HttpProvider.prototype.send = function (payload) {
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var request = this.prepareRequest(false);
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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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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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/**
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* Should be used to make async request
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*
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* @method sendAsync
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* @param {Object} payload
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* @param {Function} callback triggered on end with (err, result)
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*/
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HttpProvider.prototype.sendAsync = function (payload, callback) {
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var request = this.prepareRequest(true);
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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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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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/**
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* Synchronously tries to make Http request
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*
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* @method isConnected
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* @return {Boolean} returns true if request haven't failed. Otherwise false
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*/
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HttpProvider.prototype.isConnected = function() {
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try {
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this.send({
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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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module.exports = HttpProvider;
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