93 lines
2.6 KiB
JavaScript
93 lines
2.6 KiB
JavaScript
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/*
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This file is part of ethereum.js.
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ethereum.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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ethereum.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 ethereum.js. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file httprpc.js
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* @authors:
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* Marek Kotewicz <marek@ethdev.com>
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* Marian Oancea <marian@ethdev.com>
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* @date 2014
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*/
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var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest; // jshint ignore:line
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var HttpRpcProvider = function (host) {
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this.handlers = [];
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this.host = host;
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};
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function formatJsonRpcObject(object) {
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return {
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jsonrpc: '2.0',
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method: object.call,
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params: object.args,
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id: object._id
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};
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}
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function formatJsonRpcMessage(message) {
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var object = JSON.parse(message);
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return {
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_id: object.id,
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data: object.result
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};
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}
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HttpRpcProvider.prototype.sendRequest = function (payload, cb) {
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var data = formatJsonRpcObject(payload);
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var request = new XMLHttpRequest();
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request.open("POST", this.host, true);
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request.send(JSON.stringify(data));
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request.onreadystatechange = function () {
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if (request.readyState === 4 && cb) {
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cb(request);
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}
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};
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};
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HttpRpcProvider.prototype.send = function (payload) {
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var self = this;
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this.sendRequest(payload, function (request) {
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self.handlers.forEach(function (handler) {
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handler.call(self, formatJsonRpcMessage(request.responseText));
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});
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});
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};
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HttpRpcProvider.prototype.poll = function (payload, id) {
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var self = this;
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this.sendRequest(payload, function (request) {
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var parsed = JSON.parse(request.responseText);
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if (parsed.result instanceof Array ? parsed.result.length === 0 : !parsed.result) {
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return;
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}
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self.handlers.forEach(function (handler) {
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handler.call(self, {_event: payload.call, _id: id, data: parsed.result});
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});
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});
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};
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Object.defineProperty(HttpRpcProvider.prototype, "onmessage", {
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set: function (handler) {
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this.handlers.push(handler);
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}
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});
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module.exports = HttpRpcProvider;
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