924 lines
88 KiB
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924 lines
88 KiB
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<link rel="canonical" href="https://status-im.github.io/nim-libp2p/docs/tutorial_6_game/">
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<link rel="prev" href="../tutorial_5_discovery/">
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<link rel="next" href="../circuitrelay/">
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<meta name="generator" content="mkdocs-1.6.0, mkdocs-material-9.5.26">
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<title>Game - nim-libp2p</title>
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<link rel="stylesheet" href="../assets/stylesheets/main.6543a935.min.css">
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
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nim-libp2p
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Game
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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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<ol class="md-search-result__list" role="presentation"></ol>
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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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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.5.2 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 2024 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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status-im/nim-libp2p
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</a>
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<div class="md-container" data-md-component="container">
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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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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.5.2 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 2024 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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status-im/nim-libp2p
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</a>
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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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<span class="md-ellipsis">
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Tutorials
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<span class="md-nav__icon md-icon"></span>
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<span class="md-nav__icon md-icon"></span>
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Tutorials
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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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<span class="md-ellipsis">
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Introduction
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</span>
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</a>
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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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<span class="md-ellipsis">
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Simple connection
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</span>
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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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<span class="md-ellipsis">
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Create a custom protocol
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</span>
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</a>
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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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<span class="md-ellipsis">
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Protobuf
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</span>
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</a>
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<li class="md-nav__item">
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<a href="../tutorial_4_gossipsub/" class="md-nav__link">
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<span class="md-ellipsis">
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GossipSub
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</span>
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</a>
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<li class="md-nav__item">
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<a href="../tutorial_5_discovery/" class="md-nav__link">
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<span class="md-ellipsis">
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Discovery Manager
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<label class="md-nav__link md-nav__link--active" for="__toc">
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<span class="md-ellipsis">
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Game
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<a href="./" class="md-nav__link md-nav__link--active">
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<span class="md-ellipsis">
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Game
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</span>
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</a>
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<label class="md-nav__title" for="__toc">
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<span class="md-nav__icon md-icon"></span>
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Table of contents
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</label>
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#game-logic" class="md-nav__link">
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<span class="md-ellipsis">
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Game Logic
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</span>
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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="#matchmaking" class="md-nav__link">
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<span class="md-ellipsis">
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Matchmaking
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</span>
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</a>
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</ul>
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</nav>
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<li class="md-nav__item">
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<a href="../circuitrelay/" class="md-nav__link">
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<span class="md-ellipsis">
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Circuit Relay
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</span>
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</a>
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<h1 id="tron-example">Tron example</h1>
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<p>In this tutorial, we will create a video game based on libp2p, using
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all of the features we talked about in the last tutorials.</p>
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<p>We will:
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- Discover peers using the Discovery Manager
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- Use GossipSub to find a play mate
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- Create a custom protocol to play with him</p>
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<p>While this may look like a daunting project, it's less than 150 lines of code.</p>
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<p>The game will be a simple Tron. We will use <a href="https://github.com/ftsf/nico">nico</a>
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as a game engine. (you need to run <code>nimble install nico</code> to have it available)</p>
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<p><img alt="multiplay" src="https://user-images.githubusercontent.com/13471753/198852714-b55048e3-f233-4723-900d-2193ad259fe1.gif" /></p>
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<p>We will start by importing our dependencies and creating our types
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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">os</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">nico</span><span class="p">,</span><span class="w"> </span><span class="n">chronos</span><span class="p">,</span><span class="w"> </span><span class="n">stew</span><span class="o">/</span><span class="n">byteutils</span><span class="p">,</span><span class="w"> </span><span class="n">stew</span><span class="o">/</span><span class="n">endians2</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">libp2p</span>
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<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></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>
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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><span class="o">/</span><span class="n">discovery</span><span class="o">/</span><span class="n">rendezvousinterface</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">discovery</span><span class="o">/</span><span class="n">discoverymngr</span>
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<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>
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<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="k">const</span>
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<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="n">directions</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="o">@[</span><span class="p">(</span><span class="n">K_UP</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="o">-</span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="p">(</span><span class="n">K_LEFT</span><span class="p">,</span><span class="w"> </span><span class="o">-</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">),</span><span class="w"> </span><span class="p">(</span><span class="n">K_DOWN</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">),</span><span class="w"> </span><span class="p">(</span><span class="n">K_RIGHT</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="o">]</span>
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<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="n">mapSize</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">32</span>
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<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="n">tickPeriod</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0.2</span>
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<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a>
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<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="k">type</span>
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<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="w"> </span><span class="n">Player</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>
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<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">:</span><span class="w"> </span><span class="nb">int</span>
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<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="w"> </span><span class="n">currentDir</span><span class="p">,</span><span class="w"> </span><span class="n">nextDir</span><span class="p">:</span><span class="w"> </span><span class="nb">int</span>
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<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="n">lost</span><span class="p">:</span><span class="w"> </span><span class="nb">bool</span>
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<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="n">color</span><span class="p">:</span><span class="w"> </span><span class="nb">int</span>
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<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a>
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<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="w"> </span><span class="n">Game</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>
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<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="w"> </span><span class="n">gameMap</span><span class="p">:</span><span class="w"> </span><span class="nb">array</span><span class="o">[</span><span class="n">mapSize</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">mapSize</span><span class="p">,</span><span class="w"> </span><span class="nb">int</span><span class="o">]</span>
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<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="w"> </span><span class="n">tickTime</span><span class="p">:</span><span class="w"> </span><span class="nb">float</span>
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<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="w"> </span><span class="n">localPlayer</span><span class="p">,</span><span class="w"> </span><span class="n">remotePlayer</span><span class="p">:</span><span class="w"> </span><span class="n">Player</span>
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<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="w"> </span><span class="n">peerFound</span><span class="p">:</span><span class="w"> </span><span class="n">Future</span><span class="o">[</span><span class="n">Connection</span><span class="o">]</span>
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<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="w"> </span><span class="n">hasCandidate</span><span class="p">:</span><span class="w"> </span><span class="nb">bool</span>
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<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a><span class="w"> </span><span class="n">tickFinished</span><span class="p">:</span><span class="w"> </span><span class="n">Future</span><span class="o">[</span><span class="nb">int</span><span class="o">]</span>
|
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<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a>
|
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<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="w"> </span><span class="n">GameProto</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>
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<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a>
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<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a><span class="k">proc</span><span class="w"> </span><span class="nf">new</span><span class="p">(</span><span class="err">_: type[Game]): Game =</span>
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<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a><span class="w"> </span><span class="c"># Default state of a game</span>
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<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a><span class="w"> </span><span class="n">result</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Game</span><span class="p">(</span>
|
|
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a><span class="w"> </span><span class="n">tickTime</span><span class="p">:</span><span class="w"> </span><span class="o">-</span><span class="mf">3.0</span><span class="p">,</span><span class="w"> </span><span class="c"># 3 seconds of "warm-up" time</span>
|
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<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a><span class="w"> </span><span class="n">localPlayer</span><span class="p">:</span><span class="w"> </span><span class="n">Player</span><span class="p">(</span><span class="n">x</span><span class="p">:</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">:</span><span class="w"> </span><span class="mi">16</span><span class="p">,</span><span class="w"> </span><span class="n">currentDir</span><span class="p">:</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="n">nextDir</span><span class="p">:</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="n">color</span><span class="p">:</span><span class="w"> </span><span class="mi">8</span><span class="p">),</span>
|
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<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a><span class="w"> </span><span class="n">remotePlayer</span><span class="p">:</span><span class="w"> </span><span class="n">Player</span><span class="p">(</span><span class="n">x</span><span class="p">:</span><span class="w"> </span><span class="mi">27</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">:</span><span class="w"> </span><span class="mi">16</span><span class="p">,</span><span class="w"> </span><span class="n">currentDir</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">nextDir</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">color</span><span class="p">:</span><span class="w"> </span><span class="mi">12</span><span class="p">),</span>
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<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a><span class="w"> </span><span class="n">peerFound</span><span class="p">:</span><span class="w"> </span><span class="n">newFuture</span><span class="o">[</span><span class="n">Connection</span><span class="o">]</span><span class="p">(),</span>
|
|
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a><span class="w"> </span><span class="p">)</span>
|
|
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="n">pos</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">..</span><span class="w"> </span><span class="n">result</span><span class="p">.</span><span class="n">gameMap</span><span class="p">.</span><span class="n">high</span><span class="p">:</span>
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<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">pos</span><span class="w"> </span><span class="ow">mod</span><span class="w"> </span><span class="n">mapSize</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="o">[</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="n">mapSize</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="mi">1</span><span class="o">]</span><span class="w"> </span><span class="ow">or</span><span class="w"> </span><span class="n">pos</span><span class="w"> </span><span class="ow">div</span><span class="w"> </span><span class="n">mapSize</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="o">[</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="n">mapSize</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="mi">1</span><span class="o">]</span><span class="p">:</span>
|
|
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a><span class="w"> </span><span class="n">result</span><span class="p">.</span><span class="n">gameMap</span><span class="o">[</span><span class="n">pos</span><span class="o">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">7</span>
|
|
</code></pre></div></p>
|
|
<h2 id="game-logic">Game Logic</h2>
|
|
<p>The networking during the game will work like this:</p>
|
|
<ul>
|
|
<li>Each player will have <code>tickPeriod</code> (0.1) seconds to choose
|
|
a direction that he wants to go to (default to current direction)</li>
|
|
<li>After <code>tickPeriod</code>, we will send our choosen direction to the peer,
|
|
and wait for his direction</li>
|
|
<li>Once we have both direction, we will "tick" the game, and restart the
|
|
loop, as long as both player are alive.</li>
|
|
</ul>
|
|
<p>This is a very simplistic scheme, but creating proper networking for
|
|
video games is an <a href="https://developer.valvesoftware.com/wiki/Latency_Compensating_Methods_in_Client/Server_In-game_Protocol_Design_and_Optimization">art</a></p>
|
|
<p>The main drawback of this scheme is that the more ping you have with
|
|
the peer, the slower the game will run. Or invertedly, the less ping you
|
|
have, the faster it runs!
|
|
<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">update</span><span class="p">(</span><span class="n">g</span><span class="p">:</span><span class="w"> </span><span class="n">Game</span><span class="p">,</span><span class="w"> </span><span class="n">dt</span><span class="p">:</span><span class="w"> </span><span class="nb">float32</span><span class="p">)</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="c"># Will be called at each frame of the game.</span>
|
|
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span><span class="c">#</span>
|
|
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="c"># Because both Nico and Chronos have a main loop,</span>
|
|
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="c"># they must share the control of the main thread.</span>
|
|
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="c"># This is a hacky way to make this happen</span>
|
|
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="w"> </span><span class="n">waitFor</span><span class="p">(</span><span class="n">sleepAsync</span><span class="p">(</span><span class="mf">1.</span><span class="n">milliseconds</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="c"># Don't do anything if we are still waiting for an opponent</span>
|
|
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="ow">not</span><span class="w"> </span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">peerFound</span><span class="p">.</span><span class="n">finished</span><span class="p">())</span><span class="w"> </span><span class="ow">or</span><span class="w"> </span><span class="n">isNil</span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">tickFinished</span><span class="p">):</span>
|
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<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="w"> </span><span class="k">return</span>
|
|
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tickTime</span><span class="w"> </span><span class="o">+=</span><span class="w"> </span><span class="n">dt</span>
|
|
<a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a>
|
|
<a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="w"> </span><span class="c"># Update the wanted direction, making sure we can't go backward</span>
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|
<a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></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="mi">0</span><span class="w"> </span><span class="p">..</span><span class="w"> </span><span class="n">directions</span><span class="p">.</span><span class="n">high</span><span class="p">:</span>
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<a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">.</span><span class="n">currentDir</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="ow">mod</span><span class="w"> </span><span class="mi">4</span><span class="p">)</span><span class="w"> </span><span class="ow">and</span><span class="w"> </span><span class="n">keyp</span><span class="p">(</span><span class="n">directions</span><span class="o">[</span><span class="n">i</span><span class="o">][</span><span class="mi">0</span><span class="o">]</span><span class="p">):</span>
|
|
<a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">.</span><span class="n">nextDir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">i</span>
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|
<a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a>
|
|
<a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tickTime</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="n">tickPeriod</span><span class="w"> </span><span class="ow">and</span><span class="w"> </span><span class="ow">not</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tickFinished</span><span class="p">.</span><span class="n">finished</span><span class="p">():</span>
|
|
<a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a><span class="w"> </span><span class="c"># We choosen our next direction, let the networking know</span>
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<a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">.</span><span class="n">currentDir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">.</span><span class="n">nextDir</span>
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<a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tickFinished</span><span class="p">.</span><span class="n">complete</span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">.</span><span class="n">currentDir</span><span class="p">)</span>
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<a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a>
|
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<a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></a><span class="k">proc</span><span class="w"> </span><span class="nf">tick</span><span class="p">(</span><span class="n">g</span><span class="p">:</span><span class="w"> </span><span class="n">Game</span><span class="p">,</span><span class="w"> </span><span class="n">p</span><span class="p">:</span><span class="w"> </span><span class="n">Player</span><span class="p">)</span><span class="w"> </span><span class="o">=</span>
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<a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a><span class="w"> </span><span class="c"># Move player and check if he lost</span>
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<a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></a><span class="w"> </span><span class="n">p</span><span class="p">.</span><span class="n">x</span><span class="w"> </span><span class="o">+=</span><span class="w"> </span><span class="n">directions</span><span class="o">[</span><span class="n">p</span><span class="p">.</span><span class="n">currentDir</span><span class="o">][</span><span class="mi">1</span><span class="o">]</span>
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<a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a><span class="w"> </span><span class="n">p</span><span class="p">.</span><span class="n">y</span><span class="w"> </span><span class="o">+=</span><span class="w"> </span><span class="n">directions</span><span class="o">[</span><span class="n">p</span><span class="p">.</span><span class="n">currentDir</span><span class="o">][</span><span class="mi">2</span><span class="o">]</span>
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<a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">gameMap</span><span class="o">[</span><span class="n">p</span><span class="p">.</span><span class="n">y</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">mapSize</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">p</span><span class="p">.</span><span class="n">x</span><span class="o">]</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="mi">0</span><span class="p">:</span>
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<a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a><span class="w"> </span><span class="n">p</span><span class="p">.</span><span class="n">lost</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kp">true</span>
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<a id="__codelineno-1-29" name="__codelineno-1-29" href="#__codelineno-1-29"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">gameMap</span><span class="o">[</span><span class="n">p</span><span class="p">.</span><span class="n">y</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">mapSize</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">p</span><span class="p">.</span><span class="n">x</span><span class="o">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">p</span><span class="p">.</span><span class="n">color</span>
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<a id="__codelineno-1-30" name="__codelineno-1-30" href="#__codelineno-1-30"></a>
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<a id="__codelineno-1-31" name="__codelineno-1-31" href="#__codelineno-1-31"></a><span class="k">proc</span><span class="w"> </span><span class="nf">mainLoop</span><span class="p">(</span><span class="n">g</span><span class="p">:</span><span class="w"> </span><span class="n">Game</span><span class="p">,</span><span class="w"> </span><span class="n">peer</span><span class="p">:</span><span class="w"> </span><span class="n">Connection</span><span class="p">)</span><span class="w"> </span><span class="sx">{.async.}</span><span class="w"> </span><span class="o">=</span>
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<a id="__codelineno-1-32" name="__codelineno-1-32" href="#__codelineno-1-32"></a><span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="ow">not</span><span class="w"> </span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">.</span><span class="n">lost</span><span class="w"> </span><span class="ow">or</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">remotePlayer</span><span class="p">.</span><span class="n">lost</span><span class="p">):</span>
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<a id="__codelineno-1-33" name="__codelineno-1-33" href="#__codelineno-1-33"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tickTime</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="mf">0.0</span><span class="p">:</span>
|
|
<a id="__codelineno-1-34" name="__codelineno-1-34" href="#__codelineno-1-34"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tickTime</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span>
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<a id="__codelineno-1-35" name="__codelineno-1-35" href="#__codelineno-1-35"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tickFinished</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">newFuture</span><span class="o">[</span><span class="nb">int</span><span class="o">]</span><span class="p">()</span>
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<a id="__codelineno-1-36" name="__codelineno-1-36" href="#__codelineno-1-36"></a>
|
|
<a id="__codelineno-1-37" name="__codelineno-1-37" href="#__codelineno-1-37"></a><span class="w"> </span><span class="c"># Wait for a choosen direction</span>
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<a id="__codelineno-1-38" name="__codelineno-1-38" href="#__codelineno-1-38"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">dir</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">g</span><span class="p">.</span><span class="n">tickFinished</span>
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<a id="__codelineno-1-39" name="__codelineno-1-39" href="#__codelineno-1-39"></a><span class="w"> </span><span class="c"># Send it</span>
|
|
<a id="__codelineno-1-40" name="__codelineno-1-40" href="#__codelineno-1-40"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">peer</span><span class="p">.</span><span class="n">writeLp</span><span class="p">(</span><span class="n">toBytes</span><span class="p">(</span><span class="n">uint32</span><span class="p">(</span><span class="n">dir</span><span class="p">)))</span>
|
|
<a id="__codelineno-1-41" name="__codelineno-1-41" href="#__codelineno-1-41"></a>
|
|
<a id="__codelineno-1-42" name="__codelineno-1-42" href="#__codelineno-1-42"></a><span class="w"> </span><span class="c"># Get the one from the peer</span>
|
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<a id="__codelineno-1-43" name="__codelineno-1-43" href="#__codelineno-1-43"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">remotePlayer</span><span class="p">.</span><span class="n">currentDir</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">int</span><span class="w"> </span><span class="n">uint32</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">peer</span><span class="p">.</span><span class="n">readLp</span><span class="p">(</span><span class="mi">8</span><span class="p">))</span>
|
|
<a id="__codelineno-1-44" name="__codelineno-1-44" href="#__codelineno-1-44"></a><span class="w"> </span><span class="c"># Tick the players & restart</span>
|
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<a id="__codelineno-1-45" name="__codelineno-1-45" href="#__codelineno-1-45"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tick</span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">remotePlayer</span><span class="p">)</span>
|
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<a id="__codelineno-1-46" name="__codelineno-1-46" href="#__codelineno-1-46"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tick</span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">)</span>
|
|
</code></pre></div>
|
|
We'll draw the map & put some texts when necessary:
|
|
<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">draw</span><span class="p">(</span><span class="n">g</span><span class="p">:</span><span class="w"> </span><span class="n">Game</span><span class="p">)</span><span class="w"> </span><span class="o">=</span>
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<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="n">pos</span><span class="p">,</span><span class="w"> </span><span class="n">color</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">gameMap</span><span class="p">:</span>
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<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span><span class="n">setColor</span><span class="p">(</span><span class="n">color</span><span class="p">)</span>
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<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="n">boxFill</span><span class="p">(</span><span class="n">pos</span><span class="w"> </span><span class="ow">mod</span><span class="w"> </span><span class="mi">32</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="n">pos</span><span class="w"> </span><span class="ow">div</span><span class="w"> </span><span class="mi">32</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">)</span>
|
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<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">text</span><span class="w"> </span><span class="o">=</span>
|
|
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="ow">not</span><span class="w"> </span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">peerFound</span><span class="p">.</span><span class="n">finished</span><span class="p">()):</span>
|
|
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="s">"Matchmaking.."</span>
|
|
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span><span class="k">elif</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tickTime</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="o">-</span><span class="mf">1.5</span><span class="p">:</span>
|
|
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="w"> </span><span class="s">"Welcome to Etron"</span>
|
|
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w"> </span><span class="k">elif</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">tickTime</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="mf">0.0</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="s">"- "</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="o">$</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">abs</span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">tickTime</span><span class="p">)</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="mf">0.5</span><span class="p">)</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="s">" -"</span>
|
|
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="k">elif</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">remotePlayer</span><span class="p">.</span><span class="n">lost</span><span class="w"> </span><span class="ow">and</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">.</span><span class="n">lost</span><span class="p">:</span>
|
|
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a><span class="w"> </span><span class="s">"DEUCE"</span>
|
|
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a><span class="w"> </span><span class="k">elif</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">.</span><span class="n">lost</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="s">"YOU LOOSE"</span>
|
|
<a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a><span class="w"> </span><span class="k">elif</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">remotePlayer</span><span class="p">.</span><span class="n">lost</span><span class="p">:</span>
|
|
<a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a><span class="w"> </span><span class="s">"YOU WON"</span>
|
|
<a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a><span class="w"> </span><span class="k">else</span><span class="p">:</span>
|
|
<a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a><span class="w"> </span><span class="s">""</span>
|
|
<a id="__codelineno-2-20" name="__codelineno-2-20" href="#__codelineno-2-20"></a><span class="w"> </span><span class="n">printc</span><span class="p">(</span><span class="n">text</span><span class="p">,</span><span class="w"> </span><span class="n">screenWidth</span><span class="w"> </span><span class="ow">div</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="n">screenHeight</span><span class="w"> </span><span class="ow">div</span><span class="w"> </span><span class="mi">2</span><span class="p">)</span>
|
|
</code></pre></div></p>
|
|
<h2 id="matchmaking">Matchmaking</h2>
|
|
<p>To find an opponent, we will broadcast our address on a
|
|
GossipSub topic, and wait for someone to connect to us.
|
|
We will also listen to that topic, and connect to anyone
|
|
broadcasting his address.</p>
|
|
<p>If we are looking for a game, we'll send <code>ok</code> to let the
|
|
peer know that we are available, check that he is also available,
|
|
and launch the game.
|
|
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></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">GameProto</span><span class="o">]</span><span class="p">,</span><span class="w"> </span><span class="n">g</span><span class="p">:</span><span class="w"> </span><span class="n">Game</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-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></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="o">=</span>
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|
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="w"> </span><span class="k">defer</span><span class="p">:</span>
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|
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></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">closeWithEof</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="k">if</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">peerFound</span><span class="p">.</span><span class="n">finished</span><span class="w"> </span><span class="ow">or</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">hasCandidate</span><span class="p">:</span>
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|
<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">conn</span><span class="p">.</span><span class="n">close</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="k">return</span>
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|
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">hasCandidate</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kp">true</span>
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|
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></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">"ok"</span><span class="p">)</span>
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|
<a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="s">"ok"</span><span class="w"> </span><span class="o">!=</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>
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|
<a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">hasCandidate</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kp">false</span>
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|
<a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="w"> </span><span class="k">return</span>
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|
<a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">peerFound</span><span class="p">.</span><span class="n">complete</span><span class="p">(</span><span class="n">conn</span><span class="p">)</span>
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|
<a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="w"> </span><span class="c"># The handler of a protocol must wait for the stream to</span>
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<a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a><span class="w"> </span><span class="c"># be finished before returning</span>
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<a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></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>
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<a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></a>
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<a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></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="s">"/tron/1.0.0"</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>
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<a id="__codelineno-3-19" name="__codelineno-3-19" href="#__codelineno-3-19"></a>
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|
<a id="__codelineno-3-20" name="__codelineno-3-20" href="#__codelineno-3-20"></a><span class="k">proc</span><span class="w"> </span><span class="nf">networking</span><span class="p">(</span><span class="n">g</span><span class="p">:</span><span class="w"> </span><span class="n">Game</span><span class="p">)</span><span class="w"> </span><span class="sx">{.async.}</span><span class="w"> </span><span class="o">=</span>
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|
<a id="__codelineno-3-21" name="__codelineno-3-21" href="#__codelineno-3-21"></a><span class="w"> </span><span class="c"># Create our switch, similar to the GossipSub example and</span>
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<a id="__codelineno-3-22" name="__codelineno-3-22" href="#__codelineno-3-22"></a><span class="w"> </span><span class="c"># the Discovery examples combined</span>
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<a id="__codelineno-3-23" name="__codelineno-3-23" href="#__codelineno-3-23"></a><span class="w"> </span><span class="k">let</span>
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<a id="__codelineno-3-24" name="__codelineno-3-24" href="#__codelineno-3-24"></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>
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<a id="__codelineno-3-25" name="__codelineno-3-25" href="#__codelineno-3-25"></a><span class="w"> </span><span class="n">switch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">SwitchBuilder</span>
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<a id="__codelineno-3-26" name="__codelineno-3-26" href="#__codelineno-3-26"></a><span class="w"> </span><span class="p">.</span><span class="n">new</span><span class="p">()</span>
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<a id="__codelineno-3-27" name="__codelineno-3-27" href="#__codelineno-3-27"></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>
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<a id="__codelineno-3-28" name="__codelineno-3-28" href="#__codelineno-3-28"></a><span class="w"> </span><span class="p">.</span><span class="n">withAddresses</span><span class="p">(</span><span class="o">@[</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="o">]</span><span class="p">)</span>
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<a id="__codelineno-3-29" name="__codelineno-3-29" href="#__codelineno-3-29"></a><span class="w"> </span><span class="p">.</span><span class="n">withTcpTransport</span><span class="p">()</span>
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<a id="__codelineno-3-30" name="__codelineno-3-30" href="#__codelineno-3-30"></a><span class="w"> </span><span class="p">.</span><span class="n">withYamux</span><span class="p">()</span>
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<a id="__codelineno-3-31" name="__codelineno-3-31" href="#__codelineno-3-31"></a><span class="w"> </span><span class="p">.</span><span class="n">withNoise</span><span class="p">()</span>
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<a id="__codelineno-3-32" name="__codelineno-3-32" href="#__codelineno-3-32"></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>
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<a id="__codelineno-3-33" name="__codelineno-3-33" href="#__codelineno-3-33"></a><span class="w"> </span><span class="p">.</span><span class="n">build</span><span class="p">()</span>
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<a id="__codelineno-3-34" name="__codelineno-3-34" href="#__codelineno-3-34"></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>
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<a id="__codelineno-3-35" name="__codelineno-3-35" href="#__codelineno-3-35"></a><span class="w"> </span><span class="n">gameProto</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">GameProto</span><span class="p">.</span><span class="n">new</span><span class="p">(</span><span class="n">g</span><span class="p">)</span>
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<a id="__codelineno-3-36" name="__codelineno-3-36" href="#__codelineno-3-36"></a><span class="w"> </span><span class="n">gossip</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">GossipSub</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="n">switch</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">switch</span><span class="p">,</span><span class="w"> </span><span class="n">triggerSelf</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kp">false</span><span class="p">)</span>
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<a id="__codelineno-3-37" name="__codelineno-3-37" href="#__codelineno-3-37"></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>
|
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<a id="__codelineno-3-38" name="__codelineno-3-38" href="#__codelineno-3-38"></a>
|
|
<a id="__codelineno-3-39" name="__codelineno-3-39" href="#__codelineno-3-39"></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">gossip</span><span class="p">)</span>
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<a id="__codelineno-3-40" name="__codelineno-3-40" href="#__codelineno-3-40"></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">gameProto</span><span class="p">)</span>
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<a id="__codelineno-3-41" name="__codelineno-3-41" href="#__codelineno-3-41"></a>
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<a id="__codelineno-3-42" name="__codelineno-3-42" href="#__codelineno-3-42"></a><span class="w"> </span><span class="n">gossip</span><span class="p">.</span><span class="n">subscribe</span><span class="p">(</span>
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<a id="__codelineno-3-43" name="__codelineno-3-43" href="#__codelineno-3-43"></a><span class="w"> </span><span class="s">"/tron/matchmaking"</span><span class="p">,</span>
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<a id="__codelineno-3-44" name="__codelineno-3-44" href="#__codelineno-3-44"></a><span class="w"> </span><span class="n">proc</span><span class="p">(</span><span class="n">topic</span><span class="p">:</span><span class="w"> </span><span class="nb">string</span><span class="p">,</span><span class="w"> </span><span class="n">data</span><span class="p">:</span><span class="w"> </span><span class="nb">seq</span><span class="o">[</span><span class="n">byte</span><span class="o">]</span><span class="p">)</span><span class="w"> </span><span class="sx">{.async.}</span><span class="w"> </span><span class="o">=</span>
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|
<a id="__codelineno-3-45" name="__codelineno-3-45" href="#__codelineno-3-45"></a><span class="w"> </span><span class="c"># If we are still looking for an opponent,</span>
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<a id="__codelineno-3-46" name="__codelineno-3-46" href="#__codelineno-3-46"></a><span class="w"> </span><span class="c"># try to match anyone broadcasting its address</span>
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<a id="__codelineno-3-47" name="__codelineno-3-47" href="#__codelineno-3-47"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">peerFound</span><span class="p">.</span><span class="n">finished</span><span class="w"> </span><span class="ow">or</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">hasCandidate</span><span class="p">:</span>
|
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<a id="__codelineno-3-48" name="__codelineno-3-48" href="#__codelineno-3-48"></a><span class="w"> </span><span class="k">return</span>
|
|
<a id="__codelineno-3-49" name="__codelineno-3-49" href="#__codelineno-3-49"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">hasCandidate</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kp">true</span>
|
|
<a id="__codelineno-3-50" name="__codelineno-3-50" href="#__codelineno-3-50"></a>
|
|
<a id="__codelineno-3-51" name="__codelineno-3-51" href="#__codelineno-3-51"></a><span class="w"> </span><span class="k">try</span><span class="p">:</span>
|
|
<a id="__codelineno-3-52" name="__codelineno-3-52" href="#__codelineno-3-52"></a><span class="w"> </span><span class="k">let</span>
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<a id="__codelineno-3-53" name="__codelineno-3-53" href="#__codelineno-3-53"></a><span class="w"> </span><span class="p">(</span><span class="n">peerId</span><span class="p">,</span><span class="w"> </span><span class="n">multiAddress</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">parseFullAddress</span><span class="p">(</span><span class="n">data</span><span class="p">).</span><span class="n">tryGet</span><span class="p">()</span>
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<a id="__codelineno-3-54" name="__codelineno-3-54" href="#__codelineno-3-54"></a><span class="w"> </span><span class="n">stream</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">switch</span><span class="p">.</span><span class="n">dial</span><span class="p">(</span><span class="n">peerId</span><span class="p">,</span><span class="w"> </span><span class="o">@[</span><span class="n">multiAddress</span><span class="o">]</span><span class="p">,</span><span class="w"> </span><span class="n">gameProto</span><span class="p">.</span><span class="n">codec</span><span class="p">)</span>
|
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<a id="__codelineno-3-55" name="__codelineno-3-55" href="#__codelineno-3-55"></a>
|
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<a id="__codelineno-3-56" name="__codelineno-3-56" href="#__codelineno-3-56"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">stream</span><span class="p">.</span><span class="n">writeLp</span><span class="p">(</span><span class="s">"ok"</span><span class="p">)</span>
|
|
<a id="__codelineno-3-57" name="__codelineno-3-57" href="#__codelineno-3-57"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">await</span><span class="w"> </span><span class="n">stream</span><span class="p">.</span><span class="n">readLp</span><span class="p">(</span><span class="mi">10</span><span class="p">))</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="s">"ok"</span><span class="p">.</span><span class="n">toBytes</span><span class="p">:</span>
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|
<a id="__codelineno-3-58" name="__codelineno-3-58" href="#__codelineno-3-58"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">hasCandidate</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kp">false</span>
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|
<a id="__codelineno-3-59" name="__codelineno-3-59" href="#__codelineno-3-59"></a><span class="w"> </span><span class="k">return</span>
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|
<a id="__codelineno-3-60" name="__codelineno-3-60" href="#__codelineno-3-60"></a><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">peerFound</span><span class="p">.</span><span class="n">complete</span><span class="p">(</span><span class="n">stream</span><span class="p">)</span>
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|
<a id="__codelineno-3-61" name="__codelineno-3-61" href="#__codelineno-3-61"></a><span class="w"> </span><span class="c"># We are "player 2"</span>
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<a id="__codelineno-3-62" name="__codelineno-3-62" href="#__codelineno-3-62"></a><span class="w"> </span><span class="n">swap</span><span class="p">(</span><span class="n">g</span><span class="p">.</span><span class="n">localPlayer</span><span class="p">,</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">remotePlayer</span><span class="p">)</span>
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|
<a id="__codelineno-3-63" name="__codelineno-3-63" href="#__codelineno-3-63"></a><span class="w"> </span><span class="k">except</span><span class="w"> </span><span class="n">CatchableError</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="n">exc</span><span class="p">:</span>
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|
<a id="__codelineno-3-64" name="__codelineno-3-64" href="#__codelineno-3-64"></a><span class="w"> </span><span class="k">discard</span>
|
|
<a id="__codelineno-3-65" name="__codelineno-3-65" href="#__codelineno-3-65"></a><span class="w"> </span><span class="p">,</span>
|
|
<a id="__codelineno-3-66" name="__codelineno-3-66" href="#__codelineno-3-66"></a><span class="w"> </span><span class="p">)</span>
|
|
<a id="__codelineno-3-67" name="__codelineno-3-67" href="#__codelineno-3-67"></a>
|
|
<a id="__codelineno-3-68" name="__codelineno-3-68" href="#__codelineno-3-68"></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>
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|
<a id="__codelineno-3-69" name="__codelineno-3-69" href="#__codelineno-3-69"></a><span class="w"> </span><span class="k">defer</span><span class="p">:</span>
|
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<a id="__codelineno-3-70" name="__codelineno-3-70" href="#__codelineno-3-70"></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">stop</span><span class="p">()</span>
|
|
<a id="__codelineno-3-71" name="__codelineno-3-71" href="#__codelineno-3-71"></a>
|
|
<a id="__codelineno-3-72" name="__codelineno-3-72" href="#__codelineno-3-72"></a><span class="w"> </span><span class="c"># As explained in the last tutorial, we need a bootnode to be able</span>
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<a id="__codelineno-3-73" name="__codelineno-3-73" href="#__codelineno-3-73"></a><span class="w"> </span><span class="c"># to find peers. We could use any libp2p running rendezvous (or any</span>
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<a id="__codelineno-3-74" name="__codelineno-3-74" href="#__codelineno-3-74"></a><span class="w"> </span><span class="c"># node running tron). We will take it's MultiAddress from the command</span>
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<a id="__codelineno-3-75" name="__codelineno-3-75" href="#__codelineno-3-75"></a><span class="w"> </span><span class="c"># line parameters</span>
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<a id="__codelineno-3-76" name="__codelineno-3-76" href="#__codelineno-3-76"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">paramCount</span><span class="p">()</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="mi">0</span><span class="p">:</span>
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<a id="__codelineno-3-77" name="__codelineno-3-77" href="#__codelineno-3-77"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="p">(</span><span class="n">peerId</span><span class="p">,</span><span class="w"> </span><span class="n">multiAddress</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">paramStr</span><span class="p">(</span><span class="mi">1</span><span class="p">).</span><span class="n">parseFullAddress</span><span class="p">().</span><span class="n">tryGet</span><span class="p">()</span>
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<a id="__codelineno-3-78" name="__codelineno-3-78" href="#__codelineno-3-78"></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">peerId</span><span class="p">,</span><span class="w"> </span><span class="o">@[</span><span class="n">multiAddress</span><span class="o">]</span><span class="p">)</span>
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<a id="__codelineno-3-79" name="__codelineno-3-79" href="#__codelineno-3-79"></a><span class="w"> </span><span class="k">else</span><span class="p">:</span>
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<a id="__codelineno-3-80" name="__codelineno-3-80" href="#__codelineno-3-80"></a><span class="w"> </span><span class="n">echo</span><span class="w"> </span><span class="s">"No bootnode provided, listening on: "</span><span class="p">,</span><span class="w"> </span><span class="n">switch</span><span class="p">.</span><span class="n">peerInfo</span><span class="p">.</span><span class="n">fullAddrs</span><span class="p">.</span><span class="n">tryGet</span><span class="p">()</span>
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<a id="__codelineno-3-81" name="__codelineno-3-81" href="#__codelineno-3-81"></a>
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<a id="__codelineno-3-82" name="__codelineno-3-82" href="#__codelineno-3-82"></a><span class="w"> </span><span class="c"># Discover peers from the bootnode, and connect to them</span>
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<a id="__codelineno-3-83" name="__codelineno-3-83" href="#__codelineno-3-83"></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="s">"tron"</span><span class="p">))</span>
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<a id="__codelineno-3-84" name="__codelineno-3-84" href="#__codelineno-3-84"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">discoveryQuery</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">"tron"</span><span class="p">))</span>
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<a id="__codelineno-3-85" name="__codelineno-3-85" href="#__codelineno-3-85"></a><span class="w"> </span><span class="n">discoveryQuery</span><span class="p">.</span><span class="n">forEach</span><span class="p">:</span>
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<a id="__codelineno-3-86" name="__codelineno-3-86" href="#__codelineno-3-86"></a><span class="w"> </span><span class="k">try</span><span class="p">:</span>
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<a id="__codelineno-3-87" name="__codelineno-3-87" href="#__codelineno-3-87"></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">peer</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">peer</span><span class="p">.</span><span class="n">getAll</span><span class="p">(</span><span class="n">MultiAddress</span><span class="p">))</span>
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<a id="__codelineno-3-88" name="__codelineno-3-88" href="#__codelineno-3-88"></a><span class="w"> </span><span class="k">except</span><span class="w"> </span><span class="n">CatchableError</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="n">exc</span><span class="p">:</span>
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<a id="__codelineno-3-89" name="__codelineno-3-89" href="#__codelineno-3-89"></a><span class="w"> </span><span class="n">echo</span><span class="w"> </span><span class="s">"Failed to dial a peer: "</span><span class="p">,</span><span class="w"> </span><span class="n">exc</span><span class="p">.</span><span class="n">msg</span>
|
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<a id="__codelineno-3-90" name="__codelineno-3-90" href="#__codelineno-3-90"></a>
|
|
<a id="__codelineno-3-91" name="__codelineno-3-91" href="#__codelineno-3-91"></a><span class="w"> </span><span class="c"># We will try to publish our address multiple times, in case</span>
|
|
<a id="__codelineno-3-92" name="__codelineno-3-92" href="#__codelineno-3-92"></a><span class="w"> </span><span class="c"># it takes time to establish connections with other GossipSub peers</span>
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<a id="__codelineno-3-93" name="__codelineno-3-93" href="#__codelineno-3-93"></a><span class="w"> </span><span class="kd">var</span><span class="w"> </span><span class="n">published</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kp">false</span>
|
|
<a id="__codelineno-3-94" name="__codelineno-3-94" href="#__codelineno-3-94"></a><span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="ow">not</span><span class="w"> </span><span class="n">published</span><span class="p">:</span>
|
|
<a id="__codelineno-3-95" name="__codelineno-3-95" href="#__codelineno-3-95"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">sleepAsync</span><span class="p">(</span><span class="mf">500.</span><span class="n">milliseconds</span><span class="p">)</span>
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<a id="__codelineno-3-96" name="__codelineno-3-96" href="#__codelineno-3-96"></a><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="n">fullAddr</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="n">switch</span><span class="p">.</span><span class="n">peerInfo</span><span class="p">.</span><span class="n">fullAddrs</span><span class="p">.</span><span class="n">tryGet</span><span class="p">():</span>
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<a id="__codelineno-3-97" name="__codelineno-3-97" href="#__codelineno-3-97"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">await</span><span class="w"> </span><span class="n">gossip</span><span class="p">.</span><span class="n">publish</span><span class="p">(</span><span class="s">"/tron/matchmaking"</span><span class="p">,</span><span class="w"> </span><span class="n">fullAddr</span><span class="p">.</span><span class="n">bytes</span><span class="p">))</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">:</span>
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<a id="__codelineno-3-98" name="__codelineno-3-98" href="#__codelineno-3-98"></a><span class="w"> </span><span class="n">published</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kp">false</span>
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<a id="__codelineno-3-99" name="__codelineno-3-99" href="#__codelineno-3-99"></a><span class="w"> </span><span class="k">break</span>
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<a id="__codelineno-3-100" name="__codelineno-3-100" href="#__codelineno-3-100"></a><span class="w"> </span><span class="n">published</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kp">true</span>
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<a id="__codelineno-3-101" name="__codelineno-3-101" href="#__codelineno-3-101"></a>
|
|
<a id="__codelineno-3-102" name="__codelineno-3-102" href="#__codelineno-3-102"></a><span class="w"> </span><span class="n">discoveryQuery</span><span class="p">.</span><span class="n">stop</span><span class="p">()</span>
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<a id="__codelineno-3-103" name="__codelineno-3-103" href="#__codelineno-3-103"></a>
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<a id="__codelineno-3-104" name="__codelineno-3-104" href="#__codelineno-3-104"></a><span class="w"> </span><span class="c"># We now wait for someone to connect to us (or for us to connect to someone)</span>
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<a id="__codelineno-3-105" name="__codelineno-3-105" href="#__codelineno-3-105"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">peerConn</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">g</span><span class="p">.</span><span class="n">peerFound</span>
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<a id="__codelineno-3-106" name="__codelineno-3-106" href="#__codelineno-3-106"></a><span class="w"> </span><span class="k">defer</span><span class="p">:</span>
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<a id="__codelineno-3-107" name="__codelineno-3-107" href="#__codelineno-3-107"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">peerConn</span><span class="p">.</span><span class="n">closeWithEof</span><span class="p">()</span>
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<a id="__codelineno-3-108" name="__codelineno-3-108" href="#__codelineno-3-108"></a>
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<a id="__codelineno-3-109" name="__codelineno-3-109" href="#__codelineno-3-109"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">g</span><span class="p">.</span><span class="n">mainLoop</span><span class="p">(</span><span class="n">peerConn</span><span class="p">)</span>
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<a id="__codelineno-3-110" name="__codelineno-3-110" href="#__codelineno-3-110"></a>
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<a id="__codelineno-3-111" name="__codelineno-3-111" href="#__codelineno-3-111"></a><span class="k">let</span>
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<a id="__codelineno-3-112" name="__codelineno-3-112" href="#__codelineno-3-112"></a><span class="w"> </span><span class="n">game</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Game</span><span class="p">.</span><span class="n">new</span><span class="p">()</span>
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<a id="__codelineno-3-113" name="__codelineno-3-113" href="#__codelineno-3-113"></a><span class="w"> </span><span class="n">netFut</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">networking</span><span class="p">(</span><span class="n">game</span><span class="p">)</span>
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<a id="__codelineno-3-114" name="__codelineno-3-114" href="#__codelineno-3-114"></a><span class="n">nico</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="s">"Status"</span><span class="p">,</span><span class="w"> </span><span class="s">"Tron"</span><span class="p">)</span>
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<a id="__codelineno-3-115" name="__codelineno-3-115" href="#__codelineno-3-115"></a><span class="n">nico</span><span class="p">.</span><span class="n">createWindow</span><span class="p">(</span><span class="s">"Tron"</span><span class="p">,</span><span class="w"> </span><span class="n">mapSize</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="n">mapSize</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="kp">false</span><span class="p">)</span>
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<a id="__codelineno-3-116" name="__codelineno-3-116" href="#__codelineno-3-116"></a><span class="n">nico</span><span class="p">.</span><span class="n">run</span><span class="p">(</span>
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<a id="__codelineno-3-117" name="__codelineno-3-117" href="#__codelineno-3-117"></a><span class="w"> </span><span class="n">proc</span><span class="p">()</span><span class="w"> </span><span class="o">=</span>
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<a id="__codelineno-3-118" name="__codelineno-3-118" href="#__codelineno-3-118"></a><span class="w"> </span><span class="k">discard</span>
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<a id="__codelineno-3-119" name="__codelineno-3-119" href="#__codelineno-3-119"></a><span class="w"> </span><span class="p">,</span>
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<a id="__codelineno-3-120" name="__codelineno-3-120" href="#__codelineno-3-120"></a><span class="w"> </span><span class="n">proc</span><span class="p">(</span><span class="n">dt</span><span class="p">:</span><span class="w"> </span><span class="nb">float32</span><span class="p">)</span><span class="w"> </span><span class="o">=</span>
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<a id="__codelineno-3-121" name="__codelineno-3-121" href="#__codelineno-3-121"></a><span class="w"> </span><span class="n">game</span><span class="p">.</span><span class="n">update</span><span class="p">(</span><span class="n">dt</span><span class="p">)</span>
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<a id="__codelineno-3-122" name="__codelineno-3-122" href="#__codelineno-3-122"></a><span class="w"> </span><span class="p">,</span>
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<a id="__codelineno-3-123" name="__codelineno-3-123" href="#__codelineno-3-123"></a><span class="w"> </span><span class="n">proc</span><span class="p">()</span><span class="w"> </span><span class="o">=</span>
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<a id="__codelineno-3-124" name="__codelineno-3-124" href="#__codelineno-3-124"></a><span class="w"> </span><span class="n">game</span><span class="p">.</span><span class="n">draw</span><span class="p">()</span>
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<a id="__codelineno-3-125" name="__codelineno-3-125" href="#__codelineno-3-125"></a><span class="w"> </span><span class="p">,</span>
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<a id="__codelineno-3-126" name="__codelineno-3-126" href="#__codelineno-3-126"></a><span class="p">)</span>
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<a id="__codelineno-3-127" name="__codelineno-3-127" href="#__codelineno-3-127"></a><span class="n">waitFor</span><span class="p">(</span><span class="n">netFut</span><span class="p">.</span><span class="n">cancelAndWait</span><span class="p">())</span>
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</code></pre></div>
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And that's it! If you want to run this code locally, the simplest way is to use the
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first node as a boot node for the second one. But you can also use any rendezvous node</p>
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