91 lines
2.4 KiB
JavaScript
91 lines
2.4 KiB
JavaScript
/*
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* Copyright © 2016-2019 The Thingsboard Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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const vm = require('vm');
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function JsExecutor(useSandbox) {
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this.useSandbox = useSandbox;
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}
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JsExecutor.prototype.compileScript = function(code) {
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if (this.useSandbox) {
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return createScript(code);
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} else {
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return createFunction(code);
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}
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}
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JsExecutor.prototype.executeScript = function(script, args, timeout) {
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if (this.useSandbox) {
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return invokeScript(script, args, timeout);
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} else {
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return invokeFunction(script, args);
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}
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}
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function createScript(code) {
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return new Promise((resolve, reject) => {
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try {
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code = "("+code+")(...args)";
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var script = new vm.Script(code);
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resolve(script);
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} catch (err) {
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reject(err);
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}
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});
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}
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function invokeScript(script, args, timeout) {
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return new Promise((resolve, reject) => {
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try {
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var sandbox = Object.create(null);
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sandbox.args = args;
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var result = script.runInNewContext(sandbox, {timeout: timeout});
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resolve(result);
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} catch (err) {
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reject(err);
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}
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});
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}
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function createFunction(code) {
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return new Promise((resolve, reject) => {
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try {
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code = "return ("+code+")(...args)";
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const parsingContext = vm.createContext({});
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const func = vm.compileFunction(code, ['args'], {parsingContext: parsingContext});
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resolve(func);
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} catch (err) {
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reject(err);
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}
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});
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}
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function invokeFunction(func, args) {
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return new Promise((resolve, reject) => {
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try {
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var result = func(args);
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resolve(result);
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} catch (err) {
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reject(err);
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}
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});
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}
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module.exports = JsExecutor;
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