1130 lines
37 KiB
HTML
1130 lines
37 KiB
HTML
<!DOCTYPE html>
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<html lang='en'>
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<head>
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<meta charset='UTF-8' />
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<meta name='viewport' content='width=device-width, initial-scale=1' />
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<title>
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Webapp-Example: Main.hs – Home
|
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</title>
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|
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<meta property='og:description' content='Wie man das verwendet, siehe ([[Webapp-Example]],[]).' />
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<meta property='og:site_name' content='Home' />
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<meta property='og:image' content />
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<meta property='og:type' content='website' />
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<meta property='og:title' content='Webapp-Example: Main.hs' />
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<base href='/' />
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<link href='favicon.svg' rel='icon' />
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<script>
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window.MathJax = {
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startup: {
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ready: () => {
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MathJax.startup.defaultReady();
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}
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}
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};
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</script>
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<script async id='MathJax-script' src='https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js'></script>
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<!-- mermaid.js --><script src='https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.min.js'></script>
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<script>
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mermaid.initialize({startOnLoad:false});
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mermaid.init(undefined,document.querySelectorAll(".mermaid"));
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</script>
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<!-- highlight.js -->
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<link rel='stylesheet' href='https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.6.0/styles/hybrid.min.css' />
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<script src='https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.6.0/languages/haskell.min.js'></script>
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<script src='https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.6.0/languages/nix.min.js'></script>
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<script>hljs.highlightAll();</script>
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<link href='tailwind.css?instanceId=ecadcd50-ecaf-4d6e-98ea-7932c3b3d351' rel='stylesheet' type='text/css' />
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<!-- Heist error element -->
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<style>
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strong.error {
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color: lightcoral;
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font-size: 90%;
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font-family: monospace;
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}
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</style>
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<!-- What goes in this file will appear on near the end of <head>--><link rel='preload' href='_emanote-static/fonts/Maven_Pro/MavenPro-VariableFont_wght.ttf' as='font' type='font/ttf' crossorigin />
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<style>
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@font-face {
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font-family: 'MavenPro';
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/* FIXME: This ought to be: ${ema:emanoteStaticLayerUrl}/fonts/Maven_Pro/MavenPro-VariableFont_wght.ttf */
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src: url(_emanote-static/fonts/Maven_Pro/MavenPro-VariableFont_wght.ttf) format("truetype");
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font-display: swap;
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}
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body {
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font-family: 'MavenPro', sans-serif;
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/* font-variation-settings: 'wght'300; */
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}
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a.mavenLinkBold {
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font-variation-settings: 'wght'500;
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}
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strong {
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font-variation-settings: 'wght'500;
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}
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h1,
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h2,
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h3,
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h4,
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h5,
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h6,
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header,
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.header-font {
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font-family: 'MavenPro', sans-serif;
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}
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</style>
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<link rel='stylesheet' href='_emanote-static/inverted-tree.css' />
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<link rel='stylesheet' href='https://files.stork-search.net/releases/v1.5.0/flat.css' />
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<!-- Custom Stork-search styling for Emanote -->
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<style>
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#stork-search-container {
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z-index: 1000;
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background-color: rgb(15 23 42/.8);
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}
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.stork-overflow-hidden-important {
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overflow: hidden !important;
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}
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</style>
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<script src='https://files.stork-search.net/releases/v1.5.0/stork.js'></script>
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<script data-emanote-base-url='/'>
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window.emanote = {};
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window.emanote.stork = {
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searchShown: false,
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toggleSearch: function () {
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document.getElementById('stork-search-container').classList.toggle('hidden');
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window.emanote.stork.searchShown = document.body.classList.toggle('stork-overflow-hidden-important');
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if (window.emanote.stork.searchShown) {
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document.getElementById('stork-search-input').focus();
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}
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},
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clearSearch: function () {
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document.getElementById('stork-search-container').classList.add('hidden');
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document.body.classList.remove('stork-overflow-hidden-important');
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window.emanote.stork.searchShown = false;
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},
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init: function () {
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const indexName = 'emanote-search'; // used to match input[data-stork] attribute value
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const baseUrl = document.currentScript.getAttribute('data-emanote-base-url') || '/';
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const indexUrl = baseUrl + '-/stork.st';
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if (document.readyState !== 'complete') {
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window.addEventListener('load', function () {
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stork.register(indexName, indexUrl);
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});
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document.addEventListener('keydown', event => {
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if (window.emanote.stork.searchShown && event.key === 'Escape') {
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window.emanote.stork.clearSearch();
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event.preventDefault();
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} else if ((event.key == 'k' || event.key == 'K') && (event.ctrlKey || event.metaKey)) {
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window.emanote.stork.toggleSearch();
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event.preventDefault();
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}
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});
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} else {
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// Override existing on Ema's hot-reload
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stork.register(indexName, indexUrl, { forceOverwrite: true });
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}
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}
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};
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window.emanote.stork.init();
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</script>
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</head>
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<!-- DoNotFormat -->
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<!-- DoNotFormat -->
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<body class='bg-gray-400 overflow-y-scroll'>
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<div class='container mx-auto'>
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<nav id='breadcrumbs' class='w-full text-gray-700 md:hidden'>
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<div class='flex justify-left'>
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<div class='w-full px-2 py-2 bg-gray-50'>
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<ul class='flex flex-wrap text-lg'>
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<li class='inline-flex items-center'>
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<img style='width: 1rem;' src='favicon.svg' />
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</li>
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<li class='inline-flex items-center'>
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<a class='px-1 font-bold' href=''>
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Home
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</a>
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<svg fill='currentColor' viewBox='0 0 20 20' class='w-auto h-5 text-gray-400'>
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<path fill-rule='evenodd' d='M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z' clip-rule='evenodd'></path>
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</svg>
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</li>
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<li class='inline-flex items-center'>
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<a class='px-1 font-bold' href='Haskell'>
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Haskell
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</a>
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<svg fill='currentColor' viewBox='0 0 20 20' class='w-auto h-5 text-gray-400'>
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<path fill-rule='evenodd' d='M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z' clip-rule='evenodd'></path>
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</svg>
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</li>
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<li class='inline-flex items-center'>
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<a class='px-1 font-bold' href='Haskell/Webapp-Example'>
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Webapp-Development in Haskell
|
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</a>
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<svg fill='currentColor' viewBox='0 0 20 20' class='w-auto h-5 text-gray-400'>
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<path fill-rule='evenodd' d='M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z' clip-rule='evenodd'></path>
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</svg>
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</li>
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</ul>
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</div>
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<button class='inline px-2 py-1 bg-gray-50 outline-none cursor-pointer focus:outline-none' title='Search (Ctrl+K)' type='button' onclick='window.emanote.stork.toggleSearch()'>
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<svg xmlns='http://www.w3.org/2000/svg' style='width: 1rem;' class='hover:text-purple-700' f
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fill='none' viewBox='0 0 24 24' stroke='currentColor' stroke-width='2'>
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<path stroke-linecap='round' stroke-linejoin='round' d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z'></path>
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</svg>
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</button>
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<button class='inline px-2 py-1 text-white bg-purple-600 outline-none cursor-pointer focus:outline-none' title='Toggle sidebar' type='button' onclick="toggleHidden('sidebar')">
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<svg xmlns='http://www.w3.org/2000/svg' class='w-4' fill='none' viewBox='0 0 24 24' stroke='currentColor'>
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<path stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M4 6h16M4 12h16M4 18h16'></path>
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</svg>
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</button>
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<script>
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function toggleHidden(elemId) {
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document.getElementById(elemId).classList.toggle("hidden");
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}
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</script>
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</div>
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</nav>
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<div id='container' class='flex flex-nowrap flex-col md:flex-row bg-gray-50 md:mt-8 md:shadow-2xl md:mb-8'>
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<!-- Sidebar column -->
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<nav id='sidebar' class='flex-shrink hidden leading-relaxed md:block md:sticky md:top-0 md:h-full md:w-48 xl:w-64'>
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<div class='px-2 py-2 text-gray-800'>
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<div id='indexing-links' class='flex flex-row float-right p-2 space-x-2 text-gray-500'>
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<a href='-/tags' title='View tags'>
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<svg style='width: 1rem;' class='hover:text-purple-700' fill='none' stroke='currentColor' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'>
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<path stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M7 7h.01M7 3h5c.512 0 1.024.195 1.414.586l7 7a2 2 0 010 2.828l-7 7a2 2 0 01-2.828 0l-7-7A1.994 1.994 0 013 12V7a4 4 0 014-4z'>
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</path>
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</svg>
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</a>
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<a href='-/all' title='Expand full tree'>
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<svg style='width: 1rem;' class='hover:text-purple-700' fill='none' stroke='currentColor' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'>
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<path stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M4 8V4m0 0h4M4 4l5 5m11-1V4m0 0h-4m4 0l-5 5M4 16v4m0 0h4m-4 0l5-5m11 5l-5-5m5 5v-4m0 4h-4'>
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</path>
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</svg>
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</a>
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<a title='Search (Ctrl+K)' class='cursor-pointer' onclick='window.emanote.stork.toggleSearch()'>
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<svg xmlns='http://www.w3.org/2000/svg' style='width: 1rem;' class='hover:text-purple-700' f
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fill='none' viewBox='0 0 24 24' stroke='currentColor' stroke-width='2'>
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<path stroke-linecap='round' stroke-linejoin='round' d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z'></path>
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</svg>
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</a>
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</div>
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<div id='site-logo' class='pl-2'>
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<div class='flex items-center my-2 space-x-2 justify-left'>
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<a href='' title='Go to Home'>
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<!-- The style width attribute here is to prevent huge
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||
icon from displaying at those rare occasions when Tailwind
|
||
hasn't kicked in immediately on page load
|
||
-->
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||
<img style='width: 1rem;' class='transition transform hover:scale-110 hover:opacity-80' src='favicon.svg' />
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</a>
|
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<a class='font-bold truncate' title='Go to Home' href=''>
|
||
Home
|
||
</a>
|
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</div>
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</div>
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<!-- Variable bindings for this tree-->
|
||
|
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||
|
||
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||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg xmlns='http://www.w3.org/2000/svg' class='w-4 h-4 flex-shrink-0 inline text-gray-500' viewBox='0 0 20 20' fill='currentColor'>
|
||
<path d='M2 6a2 2 0 012-2h5l2 2h5a2 2 0 012 2v6a2 2 0 01-2 2H4a2 2 0 01-2-2V6z'></path>
|
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</svg>
|
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|
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<a class='hover:underline truncate' title='About' href='About'>
|
||
About
|
||
</a>
|
||
|
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<span class='text-gray-300' title='3 children inside'>
|
||
3
|
||
</span>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg xmlns='http://www.w3.org/2000/svg' class='w-4 h-4 flex-shrink-0 inline text-gray-500' viewBox='0 0 20 20' fill='currentColor'>
|
||
<path d='M2 6a2 2 0 012-2h5l2 2h5a2 2 0 012 2v6a2 2 0 01-2 2H4a2 2 0 01-2-2V6z'></path>
|
||
</svg>
|
||
|
||
|
||
<a class='hover:underline truncate' title='Android' href='Android'>
|
||
Android
|
||
</a>
|
||
|
||
|
||
<span class='text-gray-300' title='1 children inside'>
|
||
1
|
||
</span>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg xmlns='http://www.w3.org/2000/svg' class='w-4 h-4 flex-shrink-0 inline text-gray-700' viewBox='0 0 20 20' fill='currentColor'>
|
||
<path fill-rule='evenodd' d='M2 6a2 2 0 012-2h4l2 2h4a2 2 0 012 2v1H8a3 3 0 00-3 3v1.5a1.5 1.5 0 01-3 0V6z' clip-rule='evenodd'></path>
|
||
<path d='M6 12a2 2 0 012-2h8a2 2 0 012 2v2a2 2 0 01-2 2H2h2a2 2 0 002-2v-2z'></path>
|
||
</svg>
|
||
|
||
|
||
<a class='font-bold hover:underline truncate' title='Haskell' href='Haskell'>
|
||
Haskell
|
||
</a>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg xmlns='http://www.w3.org/2000/svg' class='w-4 h-4 flex-shrink-0 inline text-gray-500' viewBox='0 0 20 20' fill='currentColor'>
|
||
<path d='M2 6a2 2 0 012-2h5l2 2h5a2 2 0 012 2v6a2 2 0 01-2 2H4a2 2 0 01-2-2V6z'></path>
|
||
</svg>
|
||
|
||
|
||
<a class='hover:underline truncate' title='Code-Snippets' href='Haskell/Code%20Snippets'>
|
||
Code-Snippets
|
||
</a>
|
||
|
||
|
||
<span class='text-gray-300' title='2 children inside'>
|
||
2
|
||
</span>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg class='w-4 h-4 flex-shrink-0 inline' fill='none' stroke='currentColor' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'>
|
||
<path stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z'>
|
||
</path>
|
||
</svg>
|
||
|
||
|
||
<a class='hover:underline truncate' title='Fortgeschrittene funktionale Programmierung in Haskell' href='Haskell/FFPiH'>
|
||
Fortgeschrittene funktionale Programmierung in Haskell
|
||
</a>
|
||
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg class='w-4 h-4 flex-shrink-0 inline' fill='none' stroke='currentColor' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'>
|
||
<path stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z'>
|
||
</path>
|
||
</svg>
|
||
|
||
|
||
<a class='hover:underline truncate' title='Lenses' href='Haskell/Lenses'>
|
||
Lenses
|
||
</a>
|
||
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg class='w-4 h-4 flex-shrink-0 inline' fill='none' stroke='currentColor' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'>
|
||
<path stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z'>
|
||
</path>
|
||
</svg>
|
||
|
||
|
||
<a class='hover:underline truncate' title='Talks und Posts zu Haskell' href='Haskell/Advantages'>
|
||
Talks und Posts zu Haskell
|
||
</a>
|
||
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg xmlns='http://www.w3.org/2000/svg' class='w-4 h-4 flex-shrink-0 inline text-gray-700' viewBox='0 0 20 20' fill='currentColor'>
|
||
<path fill-rule='evenodd' d='M2 6a2 2 0 012-2h4l2 2h4a2 2 0 012 2v1H8a3 3 0 00-3 3v1.5a1.5 1.5 0 01-3 0V6z' clip-rule='evenodd'></path>
|
||
<path d='M6 12a2 2 0 012-2h8a2 2 0 012 2v2a2 2 0 01-2 2H2h2a2 2 0 002-2v-2z'></path>
|
||
</svg>
|
||
|
||
|
||
<a class='font-bold hover:underline truncate' title='Webapp-Development in Haskell' href='Haskell/Webapp-Example'>
|
||
Webapp-Development in Haskell
|
||
</a>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg class='w-4 h-4 flex-shrink-0 inline' fill='none' stroke='currentColor' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'>
|
||
<path stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z'>
|
||
</path>
|
||
</svg>
|
||
|
||
|
||
<a class='font-bold text-purple-600 hover:underline truncate' title='Webapp-Example: Main.hs' href='Haskell/Webapp-Example/Main.hs'>
|
||
Webapp-Example: Main.hs
|
||
</a>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg class='w-4 h-4 flex-shrink-0 inline' fill='none' stroke='currentColor' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'>
|
||
<path stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z'>
|
||
</path>
|
||
</svg>
|
||
|
||
|
||
<a class='hover:underline truncate' title='Webapp-Example: MyService/Types.hs' href='Haskell/Webapp-Example/MyService_Types.hs'>
|
||
Webapp-Example: MyService/Types.hs
|
||
</a>
|
||
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg class='w-4 h-4 flex-shrink-0 inline' fill='none' stroke='currentColor' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'>
|
||
<path stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z'>
|
||
</path>
|
||
</svg>
|
||
|
||
|
||
<a class='hover:underline truncate' title='Logik für Dummies' href='Logik'>
|
||
Logik für Dummies
|
||
</a>
|
||
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg xmlns='http://www.w3.org/2000/svg' class='w-4 h-4 flex-shrink-0 inline text-gray-500' viewBox='0 0 20 20' fill='currentColor'>
|
||
<path d='M2 6a2 2 0 012-2h5l2 2h5a2 2 0 012 2v6a2 2 0 01-2 2H4a2 2 0 01-2-2V6z'></path>
|
||
</svg>
|
||
|
||
|
||
<a class='hover:underline truncate' title='Uni' href='Uni'>
|
||
Uni
|
||
</a>
|
||
|
||
|
||
<span class='text-gray-300' title='2 children inside'>
|
||
2
|
||
</span>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
<!-- Variable bindings for this tree-->
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<!-- Rendering of this tree -->
|
||
<div class='pl-2'>
|
||
<!-- Node's rootLabel-->
|
||
<div class='flex items-center my-2 space-x-2 justify-left'>
|
||
|
||
|
||
<svg xmlns='http://www.w3.org/2000/svg' class='w-4 h-4 flex-shrink-0 inline text-gray-500' viewBox='0 0 20 20' fill='currentColor'>
|
||
<path d='M2 6a2 2 0 012-2h5l2 2h5a2 2 0 012 2v6a2 2 0 01-2 2H4a2 2 0 01-2-2V6z'></path>
|
||
</svg>
|
||
|
||
|
||
<a class='hover:underline truncate' title='Unix' href='Unix'>
|
||
Unix
|
||
</a>
|
||
|
||
|
||
<span class='text-gray-300' title='1 children inside'>
|
||
1
|
||
</span>
|
||
|
||
|
||
</div>
|
||
|
||
<!-- Node's children forest, displayed only on active trees
|
||
TODO: Use <details> to toggle visibility?
|
||
-->
|
||
|
||
</div>
|
||
|
||
|
||
</div>
|
||
</nav>
|
||
|
||
<!-- Main body column -->
|
||
<div class='flex-1 w-full overflow-x-auto bg-white'>
|
||
<main class='px-4 py-4'>
|
||
<!-- DoNotFormat -->
|
||
<!-- DoNotFormat -->
|
||
|
||
<nav id='uptree' class='flipped tree' style='transform-origin: 50%;'>
|
||
<ul class='root'>
|
||
<li>
|
||
|
||
<ul>
|
||
|
||
<li>
|
||
|
||
<div class='text-gray-900 forest-link'>
|
||
<a href='Haskell/Webapp-Example'>
|
||
Webapp-Development in Haskell
|
||
</a>
|
||
</div>
|
||
|
||
|
||
<ul>
|
||
|
||
<li>
|
||
|
||
<div class='text-gray-900 forest-link'>
|
||
<a href='Haskell'>
|
||
Haskell
|
||
</a>
|
||
</div>
|
||
|
||
|
||
<ul>
|
||
|
||
<li>
|
||
|
||
<div class='text-gray-900 forest-link'>
|
||
<a href=''>
|
||
Home
|
||
</a>
|
||
</div>
|
||
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
|
||
</ul>
|
||
|
||
</li>
|
||
</ul>
|
||
</nav>
|
||
<h1 class='flex items-end justify-center mb-4 p-3 bg-purple-100 text-5xl font-extrabold text-black rounded'>
|
||
<a class='z-40 tracking-tighter '>
|
||
Webapp-Example: Main.hs
|
||
</a>
|
||
</h1>
|
||
<article class='overflow-auto'>
|
||
<!-- What goes in this file will appear on top of note body-->
|
||
|
||
<p class='mb-3'>
|
||
Wie man das verwendet, siehe <a href='Haskell/Webapp-Example' class='text-purple-600 mavenLinkBold hover:underline' data-wikilink-type='WikiLinkTag'>Webapp-Development in Haskell</a>.
|
||
</p>
|
||
<div class='py-0.5 mb-3 text-sm'><pre><code class='haskell language-haskell'>{-# OPTIONS_GHC -Wno-name-shadowing #-}
|
||
{-# LANGUAGE FlexibleContexts #-}
|
||
{-# LANGUAGE LambdaCase #-}
|
||
{-# LANGUAGE OverloadedStrings #-}
|
||
{-# LANGUAGE RankNTypes #-}
|
||
{-# LANGUAGE RecordWildCards #-}
|
||
{-# LANGUAGE ScopedTypeVariables #-}
|
||
module MyService where
|
||
|
||
-- generische imports aus den dependencies/base, nicht in der prelude
|
||
import Codec.MIME.Type
|
||
import Configuration.Dotenv as Dotenv
|
||
import Control.Concurrent (forkIO, threadDelay)
|
||
import Control.Concurrent.Async
|
||
import Control.Concurrent.STM
|
||
import Control.Monad
|
||
import Control.Monad.Catch
|
||
import Control.Monad.Except
|
||
import Conversion
|
||
import Conversion.Text ()
|
||
import Data.Binary.Builder
|
||
import Data.String (IsString (..))
|
||
import Data.Time
|
||
import Data.Time.Clock
|
||
import Data.Time.Format
|
||
import Data.Default
|
||
import Network.HostName
|
||
import Network.HTTP.Client as HTTP hiding
|
||
(withConnection)
|
||
import Network.HTTP.Types (Status, statusCode)
|
||
import Network.Mom.Stompl.Client.Queue
|
||
import Network.Wai (Middleware)
|
||
import Network.Wai.Logger
|
||
import Network.Wai.Middleware.Cors
|
||
import Network.Wai.Middleware.RequestLogger (OutputFormat (..),
|
||
logStdout,
|
||
mkRequestLogger,
|
||
outputFormat)
|
||
import Servant.Client (mkClientEnv,
|
||
parseBaseUrl)
|
||
import System.Directory
|
||
import System.Envy
|
||
import System.IO
|
||
import System.Log.FastLogger
|
||
import Text.PrettyPrint.GenericPretty
|
||
|
||
-- generische imports, aber qualified, weil es sonst zu name-clashes kommt
|
||
|
||
import qualified Data.ByteString as BS
|
||
-- import qualified Data.ByteString.Char8 as BS8
|
||
import qualified Data.ByteString.Lazy as LBS
|
||
import qualified Network.HTTP.Client.TLS as UseDefaultHTTPSSettings (tlsManagerSettings)
|
||
import qualified Network.Mom.Stompl.Client.Queue as AMQ
|
||
import qualified Network.Wai as WAI
|
||
|
||
-- Handler für den MyServiceBackend-Typen und Imports aus den Libraries
|
||
import MyService.Handler as H -- handler der H.myApiEndpointV1Post implementiert
|
||
import MyService.Types -- weitere Type (s. nächste box)
|
||
import MyServiceGen.API as MS -- aus der generierten library
|
||
|
||
|
||
myServicemain :: IO ()
|
||
myServicemain = do
|
||
-- .env-Datei ins Prozess-Environment laden, falls noch nicht von außen gesetzt
|
||
void $ loadFile $ Dotenv.Config [".env"] [] False
|
||
-- Config holen (defaults + overrides aus dem Environment)
|
||
sc@ServerConfig{..} <- decodeWithDefaults defConfig
|
||
-- Backend-Setup
|
||
-- legt sowas wie Proxy-Server fest und wo man wie dran kommt. Benötigt für das Sprechen mit anderen Microservices
|
||
let defaultHTTPSSettings = UseDefaultHTTPSSettings.tlsManagerSettings { managerResponseTimeout = responseTimeoutMicro $ 1000 * 1000 * myserviceMaxTimeout }
|
||
createBackend url proxy = do
|
||
manager <- newManager . managerSetProxy proxy
|
||
$ defaultHTTPSSettings
|
||
url' <- parseBaseUrl url
|
||
return (mkClientEnv manager url')
|
||
internalProxy = case myserviceInternalProxyUrl of
|
||
"" -> noProxy
|
||
url -> useProxy $ HTTP.Proxy (fromString url) myserviceInternalProxyPort
|
||
-- externalProxy = case myserviceExternalProxyUrl of
|
||
-- "" -> noProxy
|
||
-- url -> useProxy $ HTTP.Proxy (fromString url) myserviceExternalProxyPort
|
||
|
||
-- Definieren & Erzeugen der Funktionen um die anderen Services anzusprechen.
|
||
calls <- (,)
|
||
<$> createBackend myserviceAUri internalProxy
|
||
<*> createBackend myserviceBUri internalProxy
|
||
|
||
-- Logging-Setup
|
||
hSetBuffering stdout LineBuffering
|
||
hSetBuffering stderr LineBuffering
|
||
|
||
|
||
-- Infos holen, brauchen wir später
|
||
myName <- getHostName
|
||
today <- formatTime defaultTimeLocale "%F" . utctDay <$> getCurrentTime
|
||
|
||
|
||
-- activeMQ-Transaktional-Queue zum schreiben nachher vorbereiten
|
||
amqPost <- newTQueueIO
|
||
|
||
|
||
-- bracket a b c == erst a machen, ergebnis an c als variablen übergeben. Schmeisst c ne exception/wird gekillt/..., werden die variablen an b übergeben.
|
||
bracket
|
||
-- logfiles öffnen
|
||
(LogFiles <$> openFile ("/logs/myservice-"<>myName<>"-"<>today<>".info") AppendMode
|
||
<*> openFile (if myserviceDebug then "/logs/myservice-"<>myName<>"-"<>today<>".debug" else "/dev/null") AppendMode
|
||
<*> openFile ("/logs/myservice-"<>myName<>"-"<>today<>".error") AppendMode
|
||
<*> openFile ("/logs/myservice-"<>myName<>"-"<>today<>".timings") AppendMode
|
||
)
|
||
-- und bei exception/beendigung schlißen.h
|
||
(\(LogFiles a b c d) -> mapM_ hClose [a,b,c,d])
|
||
$ \logfiles -> do
|
||
|
||
|
||
-- logschreibe-funktionen aliasen; log ist hier abstrakt, iolog spezialisiert auf io.
|
||
let log = printLogFiles logfiles :: MonadIO m => [LogItem] -> m ()
|
||
iolog = printLogFilesIO logfiles :: [LogItem] -> IO ()
|
||
|
||
|
||
-- H.myApiEndpointV1Post ist ein Handler (alle Handler werden mit alias H importiert) und in einer eigenen Datei
|
||
-- Per Default bekommen Handler sowas wie die server-config, die Funktionen um mit anderen Services zu reden, die AMQ-Queue um ins Kibana zu loggen und eine Datei-Logging-Funktion
|
||
-- Man kann aber noch viel mehr machen - z.b. gecachte Daten übergeben, eine Talk-Instanz, etc. pp.
|
||
server = MyServiceBackend{ myApiEndpointV1Post = H.myApiEndpointV1Post sc calls amqPost log
|
||
}
|
||
config = MS.Config $ "http://" ++ myserviceHost ++ ":" ++ show myservicePort ++ "/"
|
||
iolog . pure . Info $ "Using Server configuration:"
|
||
iolog . pure . Info $ pretty sc { myserviceActivemqPassword = "******" -- Do NOT log the password ;)
|
||
, myserviceMongoPassword = "******"
|
||
}
|
||
-- alle Services starten (Hintergrund-Aktionen wie z.b. einen MongoDB-Dumper, einen Talk-Server oder wie hier die ActiveMQ
|
||
void $ forkIO $ keepActiveMQConnected sc iolog amqPost
|
||
-- logging-Framework erzeugen
|
||
loggingMW <- loggingMiddleware
|
||
-- server starten
|
||
if myserviceDebug
|
||
then runMyServiceMiddlewareServer config (cors (\_ -> Just (simpleCorsResourcePolicy {corsRequestHeaders = ["Content-Type"]})) . loggingMW . logStdout) server
|
||
else runMyServiceMiddlewareServer config (cors (\_ -> Just (simpleCorsResourcePolicy {corsRequestHeaders = ["Content-Type"]}))) server
|
||
|
||
|
||
-- Sollte bald in die Library hs-stomp ausgelagert werden
|
||
-- ist ein Beispiel für einen ActiveMQ-Dumper
|
||
keepActiveMQConnected :: ServerConfig -> ([LogItem] -> IO ()) -> TQueue BS.ByteString -> IO ()
|
||
keepActiveMQConnected sc@ServerConfig{..} printLog var = do
|
||
res <- handle (\(e :: SomeException) -> do
|
||
printLog . pure . Error $ "Exception in AMQ-Thread: "<>show e
|
||
return $ Right ()
|
||
) $ AMQ.try $ do -- catches all AMQ-Exception that we can handle. All others bubble up.
|
||
printLog . pure . Info $ "AMQ: connecting..."
|
||
withConnection myserviceActivemqHost myserviceActivemqPort [ OAuth myserviceActivemqUsername myserviceActivemqPassword
|
||
, OTmo (30*1000) {- 30 sec timeout -}
|
||
]
|
||
[] $ \c -> do
|
||
let oconv = return
|
||
printLog . pure . Info $ "AMQ: connected"
|
||
withWriter c "Chaos-Logger for Kibana" "chaos.logs" [] [] oconv $ \writer -> do
|
||
printLog . pure . Info $ "AMQ: queue created"
|
||
let postfun = writeQ writer (Type (Application "json") []) []
|
||
void $ race
|
||
(forever $ atomically (readTQueue var) >>= postfun)
|
||
(threadDelay (600*1000*1000)) -- wait 10 Minutes
|
||
-- close writer
|
||
-- close connection
|
||
-- get outside of all try/handle/...-constructions befor recursing.
|
||
case res of
|
||
Left ex -> do
|
||
printLog . pure . Error $ "AMQ: "<>show ex
|
||
keepActiveMQConnected sc printLog var
|
||
Right _ -> keepActiveMQConnected sc printLog var
|
||
|
||
|
||
-- Beispiel für eine Custom-Logging-Middleware.
|
||
-- Hier werden z.B. alle 4xx-Status-Codes inkl. Payload ins stdout-Log geschrieben.
|
||
-- Nützlich, wenn die Kollegen ihre Requests nicht ordentlich schreiben können und der Server das Format zurecht mit einem BadRequest ablehnt ;)
|
||
loggingMiddleware :: IO Middleware
|
||
loggingMiddleware = liftIO $ mkRequestLogger $ def { outputFormat = CustomOutputFormatWithDetails out }
|
||
where
|
||
out :: ZonedDate -> WAI.Request -> Status -> Maybe Integer -> NominalDiffTime -> [BS.ByteString] -> Builder -> LogStr
|
||
out _ r status _ _ payload _
|
||
| statusCode status < 300 = ""
|
||
| statusCode status > 399 && statusCode status < 500 = "Error code "<>toLogStr (statusCode status) <>" sent. Request-Payload was: "<> mconcat (toLogStr <$> payload) <> "\n"
|
||
| otherwise = toLogStr (show r) <> "\n"
|
||
</code></pre></div>
|
||
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<a class="text-gray-300 hover:text-${theme}-600 text-sm" title="Edit this page on GitHub"
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Webapp-Development in Haskell
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