663 lines
46 KiB
HTML
663 lines
46 KiB
HTML
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<!doctype html>
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<html lang="en" class="no-js">
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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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<link rel="canonical" href="https://status-im.github.io/nim-libp2p/docs/tutorial_5_discovery/">
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<link rel="prev" href="../tutorial_4_gossipsub/">
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<link rel="next" href="../tutorial_6_game/">
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<link rel="icon" href="https://libp2p.io/img/logo_small.png">
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<meta name="generator" content="mkdocs-1.4.3, mkdocs-material-9.1.15">
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<title>Discovery Manager - nim-libp2p</title>
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<link rel="stylesheet" href="../assets/stylesheets/main.26e3688c.min.css">
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<link rel="stylesheet" href="../assets/stylesheets/palette.ecc896b0.min.css">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback">
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
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<script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
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</head>
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<body dir="ltr" data-md-color-scheme="default" data-md-color-primary="blue-grey" data-md-color-accent="indigo">
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<script>var palette=__md_get("__palette");if(palette&&"object"==typeof palette.color)for(var key of Object.keys(palette.color))document.body.setAttribute("data-md-color-"+key,palette.color[key])</script>
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<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
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<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
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<label class="md-overlay" for="__drawer"></label>
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<div data-md-component="skip">
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<a href="#discovery-manager" class="md-skip">
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Skip to content
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</a>
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</div>
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<div data-md-component="announce">
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</div>
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<header class="md-header md-header--shadow" data-md-component="header">
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href=".." title="nim-libp2p" class="md-header__button md-logo" aria-label="nim-libp2p" data-md-component="logo">
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<img src="https://libp2p.io/img/logo_small.png" alt="logo">
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</a>
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<label class="md-header__button md-icon" for="__drawer">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2Z"/></svg>
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</label>
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<div class="md-header__title" data-md-component="header-title">
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<div class="md-header__ellipsis">
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<div class="md-header__topic">
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<span class="md-ellipsis">
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nim-libp2p
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</span>
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</div>
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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Discovery Manager
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</span>
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</div>
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</div>
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</div>
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<form class="md-header__option" data-md-component="palette">
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<input class="md-option" data-md-color-media="" data-md-color-scheme="default" data-md-color-primary="blue-grey" data-md-color-accent="indigo" aria-label="Switch to dark mode" type="radio" name="__palette" id="__palette_1">
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<label class="md-header__button md-icon" title="Switch to dark mode" for="__palette_2" hidden>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M17 7H7a5 5 0 0 0-5 5 5 5 0 0 0 5 5h10a5 5 0 0 0 5-5 5 5 0 0 0-5-5m0 8a3 3 0 0 1-3-3 3 3 0 0 1 3-3 3 3 0 0 1 3 3 3 3 0 0 1-3 3Z"/></svg>
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</label>
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<input class="md-option" data-md-color-media="" data-md-color-scheme="slate" data-md-color-primary="blue-grey" data-md-color-accent="indigo" aria-label="Switch to light mode" type="radio" name="__palette" id="__palette_2">
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<label class="md-header__button md-icon" title="Switch to light mode" for="__palette_1" hidden>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M17 6H7c-3.31 0-6 2.69-6 6s2.69 6 6 6h10c3.31 0 6-2.69 6-6s-2.69-6-6-6zm0 10H7c-2.21 0-4-1.79-4-4s1.79-4 4-4h10c2.21 0 4 1.79 4 4s-1.79 4-4 4zM7 9c-1.66 0-3 1.34-3 3s1.34 3 3 3 3-1.34 3-3-1.34-3-3-3z"/></svg>
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</label>
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</form>
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<label class="md-header__button md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
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</label>
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<div class="md-search" data-md-component="search" role="dialog">
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
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<label class="md-search__icon md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.516 6.516 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5Z"/></svg>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg>
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</label>
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<nav class="md-search__options" aria-label="Search">
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<button type="reset" class="md-search__icon md-icon" title="Clear" aria-label="Clear" tabindex="-1">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19 6.41 17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12 19 6.41Z"/></svg>
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</button>
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</nav>
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</form>
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<div class="md-search__output">
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<div class="md-search__scrollwrap" data-md-scrollfix>
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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</div>
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<ol class="md-search-result__list" role="presentation"></ol>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div class="md-header__source">
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<a href="https://github.com/status-im/nim-libp2p" title="Go to repository" class="md-source" data-md-component="source">
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<div class="md-source__icon md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
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</div>
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<div class="md-source__repository">
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status-im/nim-libp2p
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</div>
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</a>
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</div>
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</nav>
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</header>
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<div class="md-container" data-md-component="container">
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
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<div class="md-sidebar__scrollwrap">
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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<label class="md-nav__title" for="__drawer">
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<a href=".." title="nim-libp2p" class="md-nav__button md-logo" aria-label="nim-libp2p" data-md-component="logo">
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<img src="https://libp2p.io/img/logo_small.png" alt="logo">
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</a>
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nim-libp2p
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</label>
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<div class="md-nav__source">
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<a href="https://github.com/status-im/nim-libp2p" title="Go to repository" class="md-source" data-md-component="source">
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<div class="md-source__icon md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
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</div>
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<div class="md-source__repository">
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status-im/nim-libp2p
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</div>
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</a>
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</div>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item md-nav__item--active md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_1" checked>
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<label class="md-nav__link" for="__nav_1" id="__nav_1_label" tabindex="0">
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Tutorials
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_1_label" aria-expanded="true">
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<label class="md-nav__title" for="__nav_1">
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<span class="md-nav__icon md-icon"></span>
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Tutorials
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href=".." class="md-nav__link">
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Introduction
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../tutorial_1_connect/" class="md-nav__link">
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Simple connection
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../tutorial_2_customproto/" class="md-nav__link">
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Create a custom protocol
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../tutorial_3_protobuf/" class="md-nav__link">
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Protobuf
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</a>
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</li>
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GossipSub
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Discovery Manager
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<h1 id="discovery-manager">Discovery Manager</h1>
|
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<p>In the <a href="../tutorial_4_gossipsub/">previous tutorial</a>, we built a custom protocol using <a href="https://developers.google.com/protocol-buffers">protobuf</a> and
|
||
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spread informations (some metrics) on the network using gossipsub.
|
||
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For this tutorial, on the other hand, we'll go back on a simple example
|
||
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we'll try to discover a specific peers to greet on the network.</p>
|
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<p>First, as usual, we import the dependencies:
|
||
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<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">import</span><span class="w"> </span><span class="n">sequtils</span>
|
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<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">import</span><span class="w"> </span><span class="n">chronos</span>
|
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<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kn">import</span><span class="w"> </span><span class="n">stew</span><span class="o">/</span><span class="n">byteutils</span>
|
||
|
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<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>
|
||
|
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<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="kn">import</span><span class="w"> </span><span class="n">libp2p</span>
|
||
|
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<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="kn">import</span><span class="w"> </span><span class="n">libp2p</span><span class="o">/</span><span class="n">protocols</span><span class="o">/</span><span class="n">rendezvous</span>
|
||
|
|
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="kn">import</span><span class="w"> </span><span class="n">libp2p</span><span class="o">/</span><span class="n">discovery</span><span class="o">/</span><span class="n">rendezvousinterface</span>
|
||
|
|
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="kn">import</span><span class="w"> </span><span class="n">libp2p</span><span class="o">/</span><span class="n">discovery</span><span class="o">/</span><span class="n">discoverymngr</span>
|
||
|
|
</code></pre></div>
|
||
|
|
We'll not use newStandardSwitch this time as we need the discovery protocol
|
||
|
|
<a href="https://github.com/libp2p/specs/blob/master/rendezvous/README.md">RendezVous</a> to be mounted on the switch using withRendezVous.</p>
|
||
|
|
<p>Note that other discovery methods such as <a href="https://github.com/libp2p/specs/blob/master/kad-dht/README.md">Kademlia</a> or <a href="https://github.com/ethereum/devp2p/blob/master/discv5/discv5.md">discv5</a> exist.
|
||
|
|
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="k">proc</span><span class="w"> </span><span class="nf">createSwitch</span><span class="p">(</span><span class="n">rdv</span><span class="p">:</span><span class="w"> </span><span class="n">RendezVous</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">RendezVous</span><span class="p">.</span><span class="n">new</span><span class="p">()):</span><span class="w"> </span><span class="n">Switch</span><span class="w"> </span><span class="o">=</span>
|
||
|
|
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span><span class="n">SwitchBuilder</span><span class="p">.</span><span class="n">new</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span><span class="p">.</span><span class="n">withRng</span><span class="p">(</span><span class="n">newRng</span><span class="p">())</span>
|
||
|
|
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="p">.</span><span class="n">withAddresses</span><span class="p">(</span><span class="o">@[</span><span class="w"> </span><span class="n">MultiAddress</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="s">"/ip4/0.0.0.0/tcp/0"</span><span class="p">).</span><span class="n">tryGet</span><span class="p">()</span><span class="w"> </span><span class="o">]</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="p">.</span><span class="n">withTcpTransport</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="p">.</span><span class="n">withYamux</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="w"> </span><span class="p">.</span><span class="n">withNoise</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="w"> </span><span class="p">.</span><span class="n">withRendezVous</span><span class="p">(</span><span class="n">rdv</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="w"> </span><span class="p">.</span><span class="n">build</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a>
|
||
|
|
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="c"># Create a really simple protocol to log one message received then close the stream</span>
|
||
|
|
<a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="k">const</span><span class="w"> </span><span class="n">DumbCodec</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"/dumb/proto/1.0.0"</span>
|
||
|
|
<a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="k">type</span><span class="w"> </span><span class="n">DumbProto</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">ref</span><span class="w"> </span><span class="k">object</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="n">LPProtocol</span>
|
||
|
|
<a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a><span class="k">proc</span><span class="w"> </span><span class="nf">new</span><span class="p">(</span><span class="n">T</span><span class="p">:</span><span class="w"> </span><span class="n">typedesc</span><span class="o">[</span><span class="n">DumbProto</span><span class="o">]</span><span class="p">,</span><span class="w"> </span><span class="n">nodeNumber</span><span class="p">:</span><span class="w"> </span><span class="nb">int</span><span class="p">):</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="o">=</span>
|
||
|
|
<a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="w"> </span><span class="k">proc</span><span class="w"> </span><span class="nf">handle</span><span class="p">(</span><span class="n">conn</span><span class="p">:</span><span class="w"> </span><span class="n">Connection</span><span class="p">,</span><span class="w"> </span><span class="n">proto</span><span class="p">:</span><span class="w"> </span><span class="nb">string</span><span class="p">)</span><span class="w"> </span><span class="sx">{.async</span>,<span class="w"> </span><span class="sx">gcsafe.}</span><span class="w"> </span><span class="o">=</span>
|
||
|
|
<a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="w"> </span><span class="n">echo</span><span class="w"> </span><span class="s">"Node"</span><span class="p">,</span><span class="w"> </span><span class="n">nodeNumber</span><span class="p">,</span><span class="w"> </span><span class="s">" received: "</span><span class="p">,</span><span class="w"> </span><span class="nb">string</span><span class="p">.</span><span class="n">fromBytes</span><span class="p">(</span><span class="n">await</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="n">readLp</span><span class="p">(</span><span class="mi">1024</span><span class="p">))</span>
|
||
|
|
<a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">T</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="n">codecs</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">@[</span><span class="n">DumbCodec</span><span class="o">]</span><span class="p">,</span><span class="w"> </span><span class="n">handler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">handle</span><span class="p">)</span>
|
||
|
|
</code></pre></div></p>
|
||
|
|
<h2 id="bootnodes">Bootnodes</h2>
|
||
|
|
<p>The first time a p2p program is ran, he needs to know how to join
|
||
|
|
its network. This is generally done by hard-coding a list of stable
|
||
|
|
nodes in the binary, called "bootnodes". These bootnodes are a
|
||
|
|
critical part of a p2p network, since they are used by every new
|
||
|
|
user to onboard the network.</p>
|
||
|
|
<p>By using libp2p, we can use any node supporting our discovery protocol
|
||
|
|
(rendezvous in this case) as a bootnode. For this example, we'll
|
||
|
|
create a bootnode, and then every peer will advertise itself on the
|
||
|
|
bootnode, and use it to find other peers
|
||
|
|
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="k">proc</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="sx">{.async</span>,<span class="w"> </span><span class="sx">gcsafe.}</span><span class="w"> </span><span class="o">=</span>
|
||
|
|
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">bootNode</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">createSwitch</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">bootNode</span><span class="p">.</span><span class="n">start</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>
|
||
|
|
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="c"># Create 5 nodes in the network</span>
|
||
|
|
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="kd">var</span>
|
||
|
|
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="n">switches</span><span class="p">:</span><span class="w"> </span><span class="nb">seq</span><span class="o">[</span><span class="n">Switch</span><span class="o">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">@[]</span>
|
||
|
|
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span><span class="n">discManagers</span><span class="p">:</span><span class="w"> </span><span class="nb">seq</span><span class="o">[</span><span class="n">DiscoveryManager</span><span class="o">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">@[]</span>
|
||
|
|
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a>
|
||
|
|
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="mf">0</span><span class="p">..</span><span class="mi">5</span><span class="p">:</span>
|
||
|
|
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">rdv</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">RendezVous</span><span class="p">.</span><span class="n">new</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="c"># Create a remote future to await at the end of the program</span>
|
||
|
|
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">switch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">createSwitch</span><span class="p">(</span><span class="n">rdv</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a><span class="w"> </span><span class="n">switch</span><span class="p">.</span><span class="n">mount</span><span class="p">(</span><span class="n">DumbProto</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="n">i</span><span class="p">))</span>
|
||
|
|
<a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a><span class="w"> </span><span class="n">switches</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n">switch</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a>
|
||
|
|
<a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a><span class="w"> </span><span class="c"># A discovery manager is a simple tool, you can set it up by adding discovery</span>
|
||
|
|
<a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a><span class="w"> </span><span class="c"># interfaces (such as RendezVousInterface) then you can use it to advertise</span>
|
||
|
|
<a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a><span class="w"> </span><span class="c"># something on the network or to request something from it.</span>
|
||
|
|
<a id="__codelineno-2-20" name="__codelineno-2-20" href="#__codelineno-2-20"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">dm</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">DiscoveryManager</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-2-21" name="__codelineno-2-21" href="#__codelineno-2-21"></a><span class="w"> </span><span class="c"># A RendezVousInterface is a RendezVous protocol wrapped to be usable by the</span>
|
||
|
|
<a id="__codelineno-2-22" name="__codelineno-2-22" href="#__codelineno-2-22"></a><span class="w"> </span><span class="c"># DiscoveryManager.</span>
|
||
|
|
<a id="__codelineno-2-23" name="__codelineno-2-23" href="#__codelineno-2-23"></a><span class="w"> </span><span class="n">dm</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n">RendezVousInterface</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="n">rdv</span><span class="p">))</span>
|
||
|
|
<a id="__codelineno-2-24" name="__codelineno-2-24" href="#__codelineno-2-24"></a><span class="w"> </span><span class="n">discManagers</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n">dm</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-2-25" name="__codelineno-2-25" href="#__codelineno-2-25"></a>
|
||
|
|
<a id="__codelineno-2-26" name="__codelineno-2-26" href="#__codelineno-2-26"></a><span class="w"> </span><span class="c"># We can now start the switch and connect to the bootnode</span>
|
||
|
|
<a id="__codelineno-2-27" name="__codelineno-2-27" href="#__codelineno-2-27"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">switch</span><span class="p">.</span><span class="n">start</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-2-28" name="__codelineno-2-28" href="#__codelineno-2-28"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">switch</span><span class="p">.</span><span class="n">connect</span><span class="p">(</span><span class="n">bootNode</span><span class="p">.</span><span class="n">peerInfo</span><span class="p">.</span><span class="n">peerId</span><span class="p">,</span><span class="w"> </span><span class="n">bootNode</span><span class="p">.</span><span class="n">peerInfo</span><span class="p">.</span><span class="n">addrs</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-2-29" name="__codelineno-2-29" href="#__codelineno-2-29"></a>
|
||
|
|
<a id="__codelineno-2-30" name="__codelineno-2-30" href="#__codelineno-2-30"></a><span class="w"> </span><span class="c"># Each nodes of the network will advertise on some topics (EvenGang or OddClub)</span>
|
||
|
|
<a id="__codelineno-2-31" name="__codelineno-2-31" href="#__codelineno-2-31"></a><span class="w"> </span><span class="n">dm</span><span class="p">.</span><span class="n">advertise</span><span class="p">(</span><span class="n">RdvNamespace</span><span class="p">(</span><span class="k">if</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="ow">mod</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">:</span><span class="w"> </span><span class="s">"EvenGang"</span><span class="w"> </span><span class="k">else</span><span class="p">:</span><span class="w"> </span><span class="s">"OddClub"</span><span class="p">))</span>
|
||
|
|
</code></pre></div>
|
||
|
|
We can now create the newcomer. This peer will connect to the boot node, and use
|
||
|
|
it to discover peers & greet them.</p>
|
||
|
|
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="w"> </span><span class="k">let</span>
|
||
|
|
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="w"> </span><span class="n">rdv</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">RendezVous</span><span class="p">.</span><span class="n">new</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="w"> </span><span class="n">newcomer</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">createSwitch</span><span class="p">(</span><span class="n">rdv</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="w"> </span><span class="n">dm</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">DiscoveryManager</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">newcomer</span><span class="p">.</span><span class="n">start</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">newcomer</span><span class="p">.</span><span class="n">connect</span><span class="p">(</span><span class="n">bootNode</span><span class="p">.</span><span class="n">peerInfo</span><span class="p">.</span><span class="n">peerId</span><span class="p">,</span><span class="w"> </span><span class="n">bootNode</span><span class="p">.</span><span class="n">peerInfo</span><span class="p">.</span><span class="n">addrs</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="w"> </span><span class="n">dm</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n">RendezVousInterface</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="n">rdv</span><span class="p">,</span><span class="w"> </span><span class="n">ttr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">250.</span><span class="n">milliseconds</span><span class="p">))</span>
|
||
|
|
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a>
|
||
|
|
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="w"> </span><span class="c"># Use the discovery manager to find peers on the OddClub topic to greet them</span>
|
||
|
|
<a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">queryOddClub</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">dm</span><span class="p">.</span><span class="n">request</span><span class="p">(</span><span class="n">RdvNamespace</span><span class="p">(</span><span class="s">"OddClub"</span><span class="p">))</span>
|
||
|
|
<a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="err">_ in 0..2:</span>
|
||
|
|
<a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="w"> </span><span class="k">let</span>
|
||
|
|
<a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="w"> </span><span class="c"># getPeer give you a PeerAttribute containing informations about the peer.</span>
|
||
|
|
<a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="w"> </span><span class="n">res</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">queryOddClub</span><span class="p">.</span><span class="n">getPeer</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a><span class="w"> </span><span class="c"># Here we will use the PeerId and the MultiAddress to greet him</span>
|
||
|
|
<a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a><span class="w"> </span><span class="n">conn</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">newcomer</span><span class="p">.</span><span class="n">dial</span><span class="p">(</span><span class="n">res</span><span class="o">[</span><span class="n">PeerId</span><span class="o">]</span><span class="p">,</span><span class="w"> </span><span class="n">res</span><span class="p">.</span><span class="n">getAll</span><span class="p">(</span><span class="n">MultiAddress</span><span class="p">),</span><span class="w"> </span><span class="n">DumbCodec</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="n">writeLp</span><span class="p">(</span><span class="s">"Odd Club suuuucks! Even Gang is better!"</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></a><span class="w"> </span><span class="c"># Uh-oh!</span>
|
||
|
|
<a id="__codelineno-3-19" name="__codelineno-3-19" href="#__codelineno-3-19"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-20" name="__codelineno-3-20" href="#__codelineno-3-20"></a><span class="w"> </span><span class="c"># Wait for the peer to close the stream</span>
|
||
|
|
<a id="__codelineno-3-21" name="__codelineno-3-21" href="#__codelineno-3-21"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="n">join</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-22" name="__codelineno-3-22" href="#__codelineno-3-22"></a><span class="w"> </span><span class="c"># Queries will run in a loop, so we must stop them when we are done</span>
|
||
|
|
<a id="__codelineno-3-23" name="__codelineno-3-23" href="#__codelineno-3-23"></a><span class="w"> </span><span class="n">queryOddClub</span><span class="p">.</span><span class="n">stop</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-24" name="__codelineno-3-24" href="#__codelineno-3-24"></a>
|
||
|
|
<a id="__codelineno-3-25" name="__codelineno-3-25" href="#__codelineno-3-25"></a><span class="w"> </span><span class="c"># Maybe it was because he wanted to join the EvenGang</span>
|
||
|
|
<a id="__codelineno-3-26" name="__codelineno-3-26" href="#__codelineno-3-26"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">queryEvenGang</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">dm</span><span class="p">.</span><span class="n">request</span><span class="p">(</span><span class="n">RdvNamespace</span><span class="p">(</span><span class="s">"EvenGang"</span><span class="p">))</span>
|
||
|
|
<a id="__codelineno-3-27" name="__codelineno-3-27" href="#__codelineno-3-27"></a><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="err">_ in 0..2:</span>
|
||
|
|
<a id="__codelineno-3-28" name="__codelineno-3-28" href="#__codelineno-3-28"></a><span class="w"> </span><span class="k">let</span>
|
||
|
|
<a id="__codelineno-3-29" name="__codelineno-3-29" href="#__codelineno-3-29"></a><span class="w"> </span><span class="n">res</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">queryEvenGang</span><span class="p">.</span><span class="n">getPeer</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-30" name="__codelineno-3-30" href="#__codelineno-3-30"></a><span class="w"> </span><span class="n">conn</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">newcomer</span><span class="p">.</span><span class="n">dial</span><span class="p">(</span><span class="n">res</span><span class="o">[</span><span class="n">PeerId</span><span class="o">]</span><span class="p">,</span><span class="w"> </span><span class="n">res</span><span class="p">.</span><span class="n">getAll</span><span class="p">(</span><span class="n">MultiAddress</span><span class="p">),</span><span class="w"> </span><span class="n">DumbCodec</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-3-31" name="__codelineno-3-31" href="#__codelineno-3-31"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="n">writeLp</span><span class="p">(</span><span class="s">"Even Gang is sooo laaame! Odd Club rocks!"</span><span class="p">)</span>
|
||
|
|
<a id="__codelineno-3-32" name="__codelineno-3-32" href="#__codelineno-3-32"></a><span class="w"> </span><span class="c"># Or maybe not...</span>
|
||
|
|
<a id="__codelineno-3-33" name="__codelineno-3-33" href="#__codelineno-3-33"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="n">close</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-34" name="__codelineno-3-34" href="#__codelineno-3-34"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="n">join</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-35" name="__codelineno-3-35" href="#__codelineno-3-35"></a><span class="w"> </span><span class="n">queryEvenGang</span><span class="p">.</span><span class="n">stop</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-36" name="__codelineno-3-36" href="#__codelineno-3-36"></a><span class="w"> </span><span class="c"># What can I say, some people just want to watch the world burn... Anyway</span>
|
||
|
|
<a id="__codelineno-3-37" name="__codelineno-3-37" href="#__codelineno-3-37"></a>
|
||
|
|
<a id="__codelineno-3-38" name="__codelineno-3-38" href="#__codelineno-3-38"></a><span class="w"> </span><span class="c"># Stop all the discovery managers</span>
|
||
|
|
<a id="__codelineno-3-39" name="__codelineno-3-39" href="#__codelineno-3-39"></a><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="n">d</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="n">discManagers</span><span class="p">:</span>
|
||
|
|
<a id="__codelineno-3-40" name="__codelineno-3-40" href="#__codelineno-3-40"></a><span class="w"> </span><span class="n">d</span><span class="p">.</span><span class="n">stop</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-41" name="__codelineno-3-41" href="#__codelineno-3-41"></a><span class="w"> </span><span class="n">dm</span><span class="p">.</span><span class="n">stop</span><span class="p">()</span>
|
||
|
|
<a id="__codelineno-3-42" name="__codelineno-3-42" href="#__codelineno-3-42"></a>
|
||
|
|
<a id="__codelineno-3-43" name="__codelineno-3-43" href="#__codelineno-3-43"></a><span class="w"> </span><span class="c"># Stop all the switches</span>
|
||
|
|
<a id="__codelineno-3-44" name="__codelineno-3-44" href="#__codelineno-3-44"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">allFutures</span><span class="p">(</span><span class="n">switches</span><span class="p">.</span><span class="n">mapIt</span><span class="p">(</span><span class="n">it</span><span class="p">.</span><span class="n">stop</span><span class="p">()))</span>
|
||
|
|
<a id="__codelineno-3-45" name="__codelineno-3-45" href="#__codelineno-3-45"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">allFutures</span><span class="p">(</span><span class="n">bootNode</span><span class="p">.</span><span class="n">stop</span><span class="p">(),</span><span class="w"> </span><span class="n">newcomer</span><span class="p">.</span><span class="n">stop</span><span class="p">())</span>
|
||
|
|
<a id="__codelineno-3-46" name="__codelineno-3-46" href="#__codelineno-3-46"></a>
|
||
|
|
<a id="__codelineno-3-47" name="__codelineno-3-47" href="#__codelineno-3-47"></a><span class="n">waitFor</span><span class="p">(</span><span class="n">main</span><span class="p">())</span>
|
||
|
|
</code></pre></div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
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|
||
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|
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|
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</article>
|
||
|
|
</div>
|
||
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|
||
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|
||
|
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</div>
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</main>
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<footer class="md-footer">
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<div class="md-footer-meta__inner md-grid">
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<div class="md-copyright">
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<a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener">
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<script id="__config" type="application/json">{"base": "..", "features": ["navigation.instant", "search.highlight"], "search": "../assets/javascripts/workers/search.208ed371.min.js", "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}}</script>
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<script src="../assets/javascripts/bundle.b4d07000.min.js"></script>
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