143 lines
4.0 KiB
JavaScript
143 lines
4.0 KiB
JavaScript
/*
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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 <marek@parity.io>
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* Marian Oancea
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* Fabian Vogelsteller <fabian@ethereum.org>
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* @date 2015
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*/
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var errors = require('web3-core-helpers').errors;
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var XHR2 = require('xhr2-cookies').XMLHttpRequest; // jshint ignore: line
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var http = require('http');
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var https = require('https');
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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 HttpProvider(host, options) {
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options = options || {};
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this.withCredentials = options.withCredentials || false;
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this.timeout = options.timeout || 0;
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this.headers = options.headers;
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this.agent = options.agent;
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this.connected = false;
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// keepAlive is true unless explicitly set to false
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const keepAlive = options.keepAlive !== false;
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this.host = host || 'http://localhost:8545';
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if (!this.agent) {
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if (this.host.substring(0,5) === "https") {
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this.httpsAgent = new https.Agent({ keepAlive });
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} else {
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this.httpAgent = new http.Agent({ keepAlive });
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}
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}
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};
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HttpProvider.prototype._prepareRequest = function(){
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var request;
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// the current runtime is a browser
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if (typeof XMLHttpRequest !== 'undefined') {
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request = new XMLHttpRequest();
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} else {
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request = new XHR2();
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var agents = {httpsAgent: this.httpsAgent, httpAgent: this.httpAgent, baseUrl: this.baseUrl};
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if (this.agent) {
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agents.httpsAgent = this.agent.https;
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agents.httpAgent = this.agent.http;
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agents.baseUrl = this.agent.baseUrl;
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}
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request.nodejsSet(agents);
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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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request.timeout = this.timeout;
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request.withCredentials = this.withCredentials;
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if(this.headers) {
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this.headers.forEach(function(header) {
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request.setRequestHeader(header.name, header.value);
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});
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}
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return request;
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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 send
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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.send = function (payload, callback) {
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var _this = this;
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var request = this._prepareRequest();
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request.onreadystatechange = function() {
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if (request.readyState === 4 && request.timeout !== 1) {
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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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_this.connected = true;
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callback(error, result);
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}
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};
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request.ontimeout = function() {
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_this.connected = false;
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callback(errors.ConnectionTimeout(this.timeout));
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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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this.connected = false;
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callback(errors.InvalidConnection(this.host));
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}
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};
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HttpProvider.prototype.disconnect = function () {
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//NO OP
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};
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/**
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* Returns the desired boolean.
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*
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* @method supportsSubscriptions
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* @returns {boolean}
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*/
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HttpProvider.prototype.supportsSubscriptions = function () {
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return false;
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};
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module.exports = HttpProvider;
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