src/kinds/nodejs/mount-plain.js

/*
 Copyright 2019 Adobe. All rights reserved.
 This file is licensed to you under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License. You may obtain a copy
 of the License at http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software distributed under
 the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
 OF ANY KIND, either express or implied. See the License for the specific language
 governing permissions and limitations under the License.
*/

/* eslint-disable strict */

const fs = require('fs');

// Variables will be replaced before the code is loaded

// path to actual action sources
const path = "$$sourcePath$$";
// main function
const mainFn = "$$main$$";
// name of module file (for helpful errors)
const sourceFile = "$$sourceFile$$";

function load(path) {
    const code = fs.readFileSync(path, {encoding: 'utf8'});

    // eslint-disable-next-line no-eval
    const fn = eval('(function(){' + code + '\n; return ' + mainFn + '})()\n //@ sourceURL=' + path);

    if (typeof fn !== 'function') {
        throw `'${mainFn}' is not a function in '${sourceFile}'. Specify the right function in wskdebug using --main.`;
    }

    return fn;
}

// load and validate on /init for quick feedback
load(path);

// eslint-disable-next-line no-unused-vars
function main(args) { // lgtm [js/unused-local-variable]
    // load code again on every new invocation
    const actionMain = load(path);

    // invoke
    return actionMain(args);
}