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router_Stack.js.html
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<!DOCTYPE html><html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Source: router/Stack.js</title><!--[if lt IE 9]>
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href="RouterResponse.html">RouterResponse</a></div><div class="sidebar-section-children"><a href="RouterStack.html">RouterStack</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-global"><div>Global</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="global.html#getRoutes">getRoutes</a></div><div class="sidebar-section-children"><a href="global.html#loadRoutes">loadRoutes</a></div></div></div></div></div><div class="navbar-container" id="VuAckcnZhf"><nav class="navbar"><div class="navbar-left-items"></div><div class="navbar-right-items"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div><nav></nav></nav></div><div class="toc-container"><div class="toc-content"><span class="bold">On this page</span><div id="eed4d2a0bfd64539bb9df78095dec881"></div></div></div><div class="body-wrapper"><div class="main-content"><div class="main-wrapper"><section id="source-page" class="source-page"><header><h1 id="title" class="has-anchor">router_Stack.js</h1></header><article><pre class="prettyprint source lang-js"><code>/**
* lambda-lambda-lambda/router
* AWS Lambda@Edge serverless application router.
*
* Copyright 2021-2023, Marc S. Brooks (https://mbrooks.info)
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
*/
'use strict';
// Local modules.
const {RouterError} = require('./Error');
const {
isAsyncFunc,
isValidFunc,
promiseEvents
} = require('./Utils');
/**
* Provides Stack item handler and methods.
*/
class RouterStack {
/**
* Create new stack instance.
*/
constructor() {
this.middleware = [];
this.routes = [];
this.resources = [];
this.fallback = null;
}
/**
* Add new function to stack items.
*
* Stack function types
* - middleware
* - route:&lt;method&gt;
* - resource:&lt;method&gt;
* - fallback
*
* @param {Function} func
* Route/middleware function.
*
* @example
* const func1 = function(req, res, next) {
* if (req.method() === 'POST') {
* res.status(405).send();
* } else {
* next();
* }
* };
*
* setFuncName(func1, 'middleware');
* stack.add(func1);
*
* ..
*
* const func2 = function(req, res) {
* res.setHeader('Content-Type', 'text/html');
* res.status(200).send('Hello World');
* };
*
* setFuncName(func2, 'route:get');
* stack.add(func2);
*/
add(func) {
if (isValidFunc(func)) {
const name = func.name;
switch (true) {
case /^middleware/.test(name):
this.middleware.push(func);
break;
case /^route:/.test(name):
this.routes.push(func);
break;
case /^resource:/.test(name):
this.resources.push(func);
break;
default:
this.fallback = func;
}
}
}
/**
* Execute stored functions (a)synchronously.
*
* Order by priority.
* > Middleware, Routes, Resources, fallback
*
* @param {RouterRequest} req
* Request instance.
*
* @param {RouterResponse} res
* Response instance.
*
* @return {Promise|undefined}
*
* @example
* stack.exec(req, res);
*
* // updated instance
* res.data();
*
* ..
*
* stack.exec(req, res)
* .then(() => res.data())
*/
exec(req, res) {
const funcs = [].concat(this.middleware, this.routes, this.resources, [this.fallback]);
let lastItem = true;
let nextItem = true;
let promises = [];
funcs.forEach((func, index) => {
if (nextItem) {
lastItem = index++ === funcs.length;
nextItem = false;
if (isAsyncFunc(func)) {
// Asynchronous handling.
promises.push(() => {
return func(req, res, function() {
throw new RouterError('Middleware next() is unsupported in async');
});
});
nextItem = !lastItem;
} else if (isValidFunc(func)) {
// Synchronous handling.
func(req, res, () => nextItem = !lastItem);
}
}
});
if (promises.length) {
return promiseEvents(promises)
.catch(err => {
if (err instanceof RouterError) {
throw err;
} else if (err) {
console.info(err);
}
});
}
}
};
module.exports = RouterStack;
</code></pre></article></section></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div id="mobile-sidebar" class="mobile-sidebar-container"><div class="mobile-sidebar-wrapper"><div class="mobile-nav-links"></div><div class="mobile-sidebar-items-c"><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-modules"><div>Modules</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="module-router_Route.html">router/Route</a></div><div class="sidebar-section-children"><a href="module-router_Utils.html">router/Utils</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-classes"><div>Classes</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="Router.html">Router</a></div><div class="sidebar-section-children"><a href="RouterRequest.html">RouterRequest</a></div><div class="sidebar-section-children"><a href="RouterResponse.html">RouterResponse</a></div><div class="sidebar-section-children"><a href="RouterStack.html">RouterStack</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-global"><div>Global</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="global.html#getRoutes">getRoutes</a></div><div class="sidebar-section-children"><a href="global.html#loadRoutes">loadRoutes</a></div></div></div><div class="mobile-navbar-actions"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div></div></div><script type="text/javascript" src="scripts/core.min.js"></script><script src="scripts/search.min.js" defer="defer"></script><script src="scripts/third-party/fuse.js" defer="defer"></script><script type="text/javascript">var tocbotInstance=tocbot.init({tocSelector:"#eed4d2a0bfd64539bb9df78095dec881",contentSelector:".main-content",headingSelector:"h1, h2, h3",hasInnerContainers:!0,scrollContainer:".main-content",headingsOffset:130,onClick:bringLinkToView})</script></body></html>