762 lines
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762 lines
48 KiB
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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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<title>Discovery Manager - nim-libp2p</title>
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nim-libp2p
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Discovery Manager
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Initializing search
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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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status-im/nim-libp2p
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Tutorials
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Tutorials
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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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</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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</a>
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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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</a>
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Protobuf
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</a>
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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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</a>
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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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Discovery Manager
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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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Discovery Manager
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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="#bootnodes" class="md-nav__link">
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<span class="md-ellipsis">
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Bootnodes
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</span>
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</a>
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</li>
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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="../tutorial_6_game/" class="md-nav__link">
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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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<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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<li class="md-nav__item">
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<a href="/nim-libp2p/master/libp2p.html" class="md-nav__link">
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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 to 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>
|
|
<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>
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<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>
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<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>
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</code></pre></div>
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We'll not use newStandardSwitch this time as we need the discovery protocol
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|
<a href="https://github.com/libp2p/specs/blob/master/rendezvous/README.md">RendezVous</a> to be mounted on the switch using withRendezVous.</p>
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<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.
|
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<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>
|
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<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span><span class="n">SwitchBuilder</span>
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<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">new</span><span class="p">()</span>
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<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">withRng</span><span class="p">(</span><span class="n">newRng</span><span class="p">())</span>
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<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">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-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></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-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></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-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></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-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></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-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="w"> </span><span class="p">.</span><span class="n">build</span><span class="p">()</span>
|
|
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a>
|
|
<a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="c"># Create a really simple protocol to log one message received then close the stream</span>
|
|
<a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></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>
|
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<a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></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>
|
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<a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></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>
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<a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></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-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></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-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></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-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a>
|
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<a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></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>
|
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</code></pre></div></p>
|
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<h2 id="bootnodes">Bootnodes</h2>
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<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="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>
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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">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>
|
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<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="mi">0</span><span class="w"> </span><span class="p">..</span><span class="w"> </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>
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|
<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>
|
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<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>
|
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<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>
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<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>
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<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>
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<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>
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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">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-3-5" 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>
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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">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>
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<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>
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<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a>
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<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>
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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">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>
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<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>
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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">let</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="c"># getPeer give you a PeerAttribute containing informations about the peer.</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="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>
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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"># Here we will use the PeerId and the MultiAddress to greet him</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">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>
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<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>
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<a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></a><span class="w"> </span><span class="c"># Uh-oh!</span>
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<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>
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<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>
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<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>
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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"># Queries will run in a loop, so we must stop them when we are done</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="n">queryOddClub</span><span class="p">.</span><span class="n">stop</span><span class="p">()</span>
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<a id="__codelineno-3-24" name="__codelineno-3-24" href="#__codelineno-3-24"></a>
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<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>
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<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>
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<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>
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<a id="__codelineno-3-28" name="__codelineno-3-28" href="#__codelineno-3-28"></a><span class="w"> </span><span class="k">let</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="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>
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<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>
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<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>
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<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>
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<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>
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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">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-3-35" 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>
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<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>
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<a id="__codelineno-3-37" name="__codelineno-3-37" href="#__codelineno-3-37"></a>
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<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>
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<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>
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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">d</span><span class="p">.</span><span class="n">stop</span><span class="p">()</span>
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<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>
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<a id="__codelineno-3-42" name="__codelineno-3-42" href="#__codelineno-3-42"></a>
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<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>
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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">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>
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<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>
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<a id="__codelineno-3-46" name="__codelineno-3-46" href="#__codelineno-3-46"></a>
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<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>
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</code></pre></div>
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