380 lines
28 KiB
HTML
380 lines
28 KiB
HTML
<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"/><meta name="viewport" content="width=device-width, initial-scale=1"/><title> <loganGatlin/> </title><link type="image/x-icon" href="resources/favicon.svg" rel="icon"/><style>
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/*!
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Pure v3.0.0
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Copyright 2013 Yahoo!
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Licensed under the BSD License.
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https://github.com/pure-css/pure/blob/master/LICENSE
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*/
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/*!
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normalize.css v | MIT License | https://necolas.github.io/normalize.css/
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Copyright (c) Nicolas Gallagher and Jonathan Neal
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*/
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/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline 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.pure-menu-separator{display:block;width:auto}.pure-menu-heading{text-transform:uppercase;color:#565d64}.pure-menu-link{color:#777}.pure-menu-children{background-color:#fff}.pure-menu-heading,.pure-menu-link{padding:.5em 1em}.pure-menu-disabled{opacity:.5}.pure-menu-disabled .pure-menu-link:hover{background-color:transparent;cursor:default}.pure-menu-active>.pure-menu-link,.pure-menu-link:focus,.pure-menu-link:hover{background-color:#eee}.pure-menu-selected>.pure-menu-link,.pure-menu-selected>.pure-menu-link:visited{color:#000}.pure-table{border-collapse:collapse;border-spacing:0;empty-cells:show;border:1px solid #cbcbcb}.pure-table caption{color:#000;font:italic 85%/1 arial,sans-serif;padding:1em 0;text-align:center}.pure-table td,.pure-table th{border-left:1px solid #cbcbcb;border-width:0 0 0 1px;font-size:inherit;margin:0;overflow:visible;padding:.5em 1em}.pure-table thead{background-color:#e0e0e0;color:#000;text-align:left;vertical-align:bottom}.pure-table td{background-color:transparent}.pure-table-odd td{background-color:#f2f2f2}.pure-table-striped tr:nth-child(2n-1) td{background-color:#f2f2f2}.pure-table-bordered td{border-bottom:1px solid #cbcbcb}.pure-table-bordered tbody>tr:last-child>td{border-bottom-width:0}.pure-table-horizontal td,.pure-table-horizontal th{border-width:0 0 1px 0;border-bottom:1px solid #cbcbcb}.pure-table-horizontal tbody>tr:last-child>td{border-bottom-width:0}
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</style><style>
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@font-face {
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font-family: Cascadia;
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src: url("/resources/CascadiaMonoPL.woff2");
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}
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body {
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color: #444;
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font-size: 1.2em;
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}
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.link {
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text-decoration: none;
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color: #1e90ff;
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}
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.link :visited {
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color: #1e90ff;
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}
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table {
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display: block;
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margin-top: 1em;
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margin-bottom: 1em;
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margin-left: auto;
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margin-right: auto;
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width: 60%;
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text-align: left;
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border-collapse: collapse;
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}
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th {
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padding: 0.25em 0.25em 0.25em 0.25em;
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border: 2px solid;
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border-collapse: collapse;
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}
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td {
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padding: 0.25em 0.25em 0.25em 0.25em;
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border: 2px solid;
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border-collapse: collapse;
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}
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/* https://css-loaders.com/spinner/ */
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/* HTML: <div class="loader"></div> */
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.loading {
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width: 512px;
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padding: 8px;
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aspect-ratio: 1;
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border-radius: 50%;
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background: #25b09b;
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--_m:
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conic-gradient(#0000 10%,#000),
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linear-gradient(#000 0 0) content-box;
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-webkit-mask: var(--_m);
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mask: var(--_m);
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-webkit-mask-composite: source-out;
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mask-composite: subtract;
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animation: l3 1s infinite linear;
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}
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@keyframes l3 {to{transform: rotate(1turn)}}
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.centered {
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display: block;
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margin-top: 1em;
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margin-bottom: 1em;
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margin-left: auto;
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margin-right: auto;
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width: 50%;
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}
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.pure-img-responsive { max-width: 100%; height: auto;
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}
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.cascadia {
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font-family: Cascadia;
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}
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.home-menu {
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padding: 0.5em;
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text-align: center;
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box-shadow: 0 1px 1px rgba(0,0,0, 0.10);
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}
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.home-menu {
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background: #333;
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}
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.home-menu a {
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color: #ccc;
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}
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.home-menu li a:hover,
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.home-menu li a:focus {
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animation: menu-hover-anim 0.25s ease-out;
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animation-fill-mode: forwards;
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background: none;
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border: none;
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}
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.link {
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color: #00f;
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text-decoration: none;
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}
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.video {
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text-align: center;
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}
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.video iframe {
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width: 32em;
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height: 18em;
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frameborder: "0";
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}
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/*
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Add transition to containers so they can push in and out.
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*/
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#layout,
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#menu,
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.menu-link {
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-webkit-transition: all 0.2s ease-out;
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-moz-transition: all 0.2s ease-out;
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-ms-transition: all 0.2s ease-out;
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-o-transition: all 0.2s ease-out;
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transition: all 0.2s ease-out;
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}
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/*
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This is the parent `<div>` that contains the menu and the content area.
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*/
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#layout {
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position: relative;
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left: 0;
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padding-left: 0;
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}
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#layout.active #menu {
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left: 150px;
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width: 150px;
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}
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#layout.active .menu-link {
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left: 150px;
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}
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/*
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The content `<div>` is where all your content goes.
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*/
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.content {
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margin: 0 auto;
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padding: 0 2em;
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max-width: 800px;
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margin-bottom: 50px;
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line-height: 1.6em;
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text-align: justify;
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}
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.header {
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margin: 0;
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color: #444;
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text-align: center;
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padding: 2.5em 4em 0;
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border-bottom: 1px solid #eee;
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}
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.header h1 {
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margin: 0.2em 0;
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font-size: 2.5em;
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font-weight: bold;
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}
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.header h2 {
|
|
font-weight: 300;
|
|
color: #888;
|
|
padding: 0;
|
|
margin-top: 0;
|
|
}
|
|
|
|
.distinct {
|
|
background-color: #444;
|
|
color: #fff;
|
|
padding: 0.5em 0.5em 0.5em 0.5em;
|
|
}
|
|
|
|
@keyframes card-hover-anim {
|
|
to {background-color: #ccc;}
|
|
}
|
|
@keyframes card-text-hover-anim {
|
|
to {color: #222;}
|
|
}
|
|
|
|
.spaced {
|
|
padding: 0.5em 0.5em 0.5em 0.5em;
|
|
margin: 1em 0em 1em 0em;
|
|
}
|
|
|
|
h1 a svg {
|
|
vertical-align: middle;
|
|
}
|
|
|
|
.card {
|
|
background-color: #eee;
|
|
text-decoration: none;
|
|
text-align: left;
|
|
}
|
|
|
|
.card h1 {
|
|
color: #444;
|
|
}
|
|
.card h2 {
|
|
color: #777;
|
|
}
|
|
.card h3 {
|
|
color: #999;
|
|
}
|
|
.card a {
|
|
text-decoration: none;
|
|
display: block;
|
|
}
|
|
|
|
.card:hover {
|
|
animation: card-hover-anim 0.25s ease-out;
|
|
animation-fill-mode: forwards;
|
|
}
|
|
|
|
|
|
/* .card:hover h3 { */
|
|
/* animation: card-text-hover-anim 0.25s ease-out; */
|
|
/* animation-fill-mode: forwards; */
|
|
/* } */
|
|
|
|
.card img {
|
|
vertical-align: bottom;
|
|
float: right;
|
|
padding: 0em 0.1em 0em 0.1em;
|
|
width: 60px;
|
|
}
|
|
.card svg {
|
|
vertical-align: bottom;
|
|
float: right;
|
|
padding: 0em 0.1em 0em 0.1em;
|
|
width: 3em;
|
|
height: auto;
|
|
}
|
|
|
|
|
|
.content-subhead {
|
|
margin: 50px 0 20px 0;
|
|
font-weight: 300;
|
|
color: #444;
|
|
}
|
|
|
|
code {
|
|
font-family: Cascadia;
|
|
}
|
|
|
|
.code-block {
|
|
/* background-color: #fdf6e3; */
|
|
background-color: #eee;
|
|
color: #002b36;
|
|
font-family: Cascadia;
|
|
font-size: 0.85em;
|
|
padding: 0em 0.5em 0em 0.5em;
|
|
margin: 1em 0em 1em 0em;
|
|
page-break-inside: avoid;
|
|
display: block;
|
|
overflow: auto;
|
|
word-wrap: break-word;
|
|
max-width: 100%;
|
|
}
|
|
.code-block pre {
|
|
display: block;
|
|
margin: 0 0 0 0;
|
|
padding: 0 0 0 0;
|
|
}
|
|
|
|
.code-block pre code {
|
|
font-family: Cascadia;
|
|
display: block;
|
|
white-space: pre-wrap;
|
|
}
|
|
.code-block span {
|
|
/* background-color: #fdf6e3; */
|
|
background-color: #eee;
|
|
}
|
|
.keyword {
|
|
color: #6c71c4;
|
|
}
|
|
.constant {
|
|
color: #cb4b16;
|
|
}
|
|
.function {
|
|
color: #268bd2;
|
|
}
|
|
.operator {
|
|
color: #6c71c4;
|
|
}
|
|
.punctuation {
|
|
color: #586e75;
|
|
}
|
|
.string {
|
|
color: #859900;
|
|
}
|
|
.type {
|
|
color: #2aa198;
|
|
}
|
|
.property {
|
|
color: #586e75;
|
|
}
|
|
</style></head><body><div class="pure-g"><div class="pure-u-1-1"><div class="header"><h1> Rust HTTP Server </h1><h2> Keywords: Back End - TCP - SSL </h2></div><div class="content"><h2 class="distinct"> Motivation </h2>
|
|
As a systems programmer, I want to understand the technologies
|
|
I use at a very low level. Modern web stacks abstract away the
|
|
process of handling TCP connections, serving SSL certificates,
|
|
and parsing HTTP requests. The best way to understand a technology
|
|
is to implement it from the ground up, I studied the HTTP 1.1
|
|
specification and wrote a server to host my website.
|
|
<h2 class="distinct"> Approach </h2>
|
|
At the most basic level, the server will translate the request URL
|
|
into a local file path, and respond with the file matching that path
|
|
if it exists. Request URLs are sanitized to prevent accessing files
|
|
outside of the server's directory. Two tables are used for rewriting
|
|
and routing URLs. This makes handling URLs predictable and robust.
|
|
<div class="code-block">
|
|
<pre><code>
|
|
<span class="comment">// Snippet from the request handling code</span>
|
|
<span class="keyword">pub</span> <span class="keyword">async</span> <span class="keyword function">fn</span> <span class="function">construct_response</span><span class="punctuation bracket">(</span><span class="keyword storage modifier">&</span><span class="variable builtin">self</span><span class="punctuation delimiter">,</span> <span class="variable parameter">request_url</span>: <span class="keyword storage modifier">&</span><span class="type builtin">str</span><span class="punctuation bracket">)</span> <span class="operator">-></span> <span class="type">Response</span> <span class="punctuation bracket">{</span>
|
|
<span class="keyword storage">let</span> <span class="variable">sanitized_url</span> <span class="operator">=</span> <span class="function">rewrite_url</span><span class="punctuation bracket">(</span><span class="variable parameter">request_url</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">;</span>
|
|
<span class="keyword control conditional">if</span> <span class="variable">sanitized_url</span> <span class="operator">!=</span> <span class="variable parameter">request_url</span> <span class="punctuation bracket">{</span>
|
|
<span class="keyword control return">return</span> <span class="type">Self</span><span class="punctuation delimiter">::</span><span class="function">redirect</span><span class="punctuation bracket">(</span><span class="operator">&</span><span class="variable">sanitized_url</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">;</span>
|
|
<span class="punctuation bracket">}</span>
|
|
|
|
<span class="keyword storage">let</span> <span class="variable">routed_url</span> <span class="operator">=</span> <span class="variable builtin">self</span><span class="punctuation delimiter">.</span><span class="function">perform_routing</span><span class="punctuation bracket">(</span><span class="operator">&</span><span class="variable">sanitized_url</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">.</span><span class="keyword control return">await</span><span class="punctuation delimiter">;</span>
|
|
<span class="keyword control conditional">if</span> <span class="keyword storage">let</span> <span class="constructor">Some</span><span class="punctuation bracket">(</span><span class="variable">response</span><span class="punctuation bracket">)</span> <span class="operator">=</span>
|
|
<span class="variable builtin">self</span><span class="punctuation delimiter">.</span><span class="function">perform_redirecting</span><span class="punctuation bracket">(</span><span class="operator">&</span><span class="variable">routed_url</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">.</span><span class="keyword control return">await</span> <span class="punctuation bracket">{</span>
|
|
<span class="keyword control return">return</span> <span class="variable">response</span><span class="punctuation delimiter">;</span>
|
|
<span class="punctuation bracket">}</span>
|
|
<span class="keyword control conditional">match</span> <span class="variable builtin">self</span><span class="punctuation delimiter">.</span><span class="function">get_resource</span><span class="punctuation bracket">(</span><span class="operator">&</span><span class="variable">routed_url</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">.</span><span class="keyword control return">await</span> <span class="punctuation bracket">{</span>
|
|
<span class="constructor">Some</span><span class="punctuation bracket">(</span><span class="variable">bytes</span><span class="punctuation bracket">)</span> <span class="operator">=></span> <span class="type">Response</span><span class="punctuation delimiter">::</span><span class="function">from_data</span><span class="punctuation bracket">(</span><span class="variable">bytes</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">,</span>
|
|
<span class="constructor">None</span> <span class="operator">=></span> <span class="type">Self</span><span class="punctuation delimiter">::</span><span class="function">not_found</span><span class="punctuation bracket">(</span><span class="punctuation bracket">)</span><span class="punctuation delimiter">,</span>
|
|
<span class="punctuation bracket">}</span>
|
|
<span class="punctuation bracket">}</span>
|
|
</code></pre>
|
|
</div>
|
|
I use Cloudflare to manage my domain name, DNS records, and SSL certificates.
|
|
Cloudflare automatically caches resources, rewrites HTTP requests to HTTPS,
|
|
and limits request sizes. This allows my server to only listen on port 443
|
|
and neglect caching server-side.
|
|
<h2 class="distinct"> Dependencies </h2>
|
|
My goal with this project was to provide a functional server using as few
|
|
libraries as possible. The final project directly depends on four crates:
|
|
<div class="code-block">
|
|
<pre><code>
|
|
// Snippet from Cargo<span class="punctuation delimiter">.</span>toml
|
|
<span class="punctuation bracket">[</span><span class="type">dependencies</span><span class="punctuation bracket">]</span>
|
|
<span class="variable other member">log</span> <span class="operator">=</span> <span class="string">"0.4"</span>
|
|
<span class="variable other member">log4rs</span> <span class="operator">=</span> <span class="string">"1.3"</span>
|
|
<span class="variable other member">tiny_http</span> <span class="operator">=</span> <span class="string">"0.12"</span>
|
|
<span class="variable other member">tokio</span> <span class="operator">=</span> <span class="punctuation bracket">{</span><span class="variable other member">version</span> <span class="operator">=</span> <span class="string">"1"</span><span class="punctuation delimiter">,</span> <span class="variable other member">features</span> <span class="operator">=</span> <span class="punctuation bracket">[</span><span class="string">"full"</span><span class="punctuation bracket">]</span><span class="punctuation bracket">}</span>
|
|
</code></pre>
|
|
</div>
|
|
The first two crates, log and log4rs, provide logging functions which aren't critical to the
|
|
server's functionality. The tiny_http crate provides a simple wrapper for the standard
|
|
library TCP stream, and performs SSL encryption. It is used as the backbone
|
|
for many Rust web frameworks. While I could implement these features myself, I
|
|
decided against it for security and browser compatibility reasons. Finally there is
|
|
tokio, an async runtime. This is necessary because Rust does not provide a runtime
|
|
by default, and building one is out of scope.
|
|
</div></div></div></body></html> |