doc/router_Stack.js.html at master · lambda-lambda-lambda/doc · GitHub

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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]>

<![endif]--><script src="scripts/third-party/hljs.js" defer="defer"></script><script src="scripts/third-party/hljs-line-num.js" defer="defer"></script><script src="scripts/third-party/popper.js" defer="defer"></script><script src="scripts/third-party/tippy.js" defer="defer"></script><script src="scripts/third-party/tocbot.min.js"></script><script>var baseURL="/",locationPathname="";baseURL=(locationPathname=document.location.pathname).substr(0,locationPathname.lastIndexOf("/")+1)</script><link rel="stylesheet" href="styles/clean-jsdoc-theme.min.css"><svg aria-hidden="true" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="display:none"><defs><symbol id="copy-icon" viewbox="0 0 488.3 488.3"><g><path d="M314.25,85.4h-227c-21.3,0-38.6,17.3-38.6,38.6v325.7c0,21.3,17.3,38.6,38.6,38.6h227c21.3,0,38.6-17.3,38.6-38.6V124 C352.75,102.7,335.45,85.4,314.25,85.4z M325.75,449.6c0,6.4-5.2,11.6-11.6,11.6h-227c-6.4,0-11.6-5.2-11.6-11.6V124 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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.

* 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>

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