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<h1 id="circuit-relay-example">Circuit Relay example</h1>
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<p>Circuit Relay can be used when a node cannot reach another node
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directly, but can reach it through a another node (the Relay).</p>
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<p>That may happen because of NAT, Firewalls, or incompatible transports.</p>
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<p>More informations <a href="https://docs.libp2p.io/concepts/circuit-relay/">here</a>.</p>
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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">chronos</span><span class="p">,</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-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">import</span><span class="w"> </span><span class="n">libp2p</span><span class="p">,</span>
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<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><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">connectivity</span><span class="o">/</span><span class="n">relay</span><span class="o">/[</span><span class="n">relay</span><span class="p">,</span><span class="w"> </span><span class="n">client</span><span class="o">]</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="c"># Helper to create a circuit relay node</span>
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<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="k">proc</span><span class="w"> </span><span class="nf">createCircuitRelaySwitch</span><span class="p">(</span><span class="n">r</span><span class="p">:</span><span class="w"> </span><span class="n">Relay</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-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="w"> </span><span class="n">SwitchBuilder</span><span class="p">.</span><span class="n">new</span><span class="p">()</span>
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|
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w"> </span><span class="p">.</span><span class="n">withRng</span><span class="p">(</span><span class="n">newRng</span><span class="p">())</span>
|
|
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="p">.</span><span class="n">withAddresses</span><span class="p">(</span><span class="o">@[</span><span class="w"> </span><span class="n">MultiAddress</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="s">"/ip4/0.0.0.0/tcp/0"</span><span class="p">).</span><span class="n">tryGet</span><span class="p">()</span><span class="w"> </span><span class="o">]</span><span class="p">)</span>
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|
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></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-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="p">.</span><span class="n">withMplex</span><span class="p">()</span>
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<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></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-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="p">.</span><span class="n">withCircuitRelay</span><span class="p">(</span><span class="n">r</span><span class="p">)</span>
|
|
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></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-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a>
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<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></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>
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|
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="c"># Create a custom protocol</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="k">let</span><span class="w"> </span><span class="n">customProtoCodec</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"/test"</span>
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<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="kd">var</span><span class="w"> </span><span class="n">proto</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">new</span><span class="w"> </span><span class="n">LPProtocol</span>
|
|
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="w"> </span><span class="n">proto</span><span class="p">.</span><span class="n">codec</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">customProtoCodec</span>
|
|
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="w"> </span><span class="n">proto</span><span class="p">.</span><span class="n">handler</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">proc</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-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="w"> </span><span class="kd">var</span><span class="w"> </span><span class="n">msg</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>
|
|
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="w"> </span><span class="n">echo</span><span class="w"> </span><span class="s">"1 - Dst Received: "</span><span class="p">,</span><span class="w"> </span><span class="n">msg</span>
|
|
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="w"> </span><span class="n">assert</span><span class="w"> </span><span class="s">"test1"</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">msg</span>
|
|
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></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">"test2"</span><span class="p">)</span>
|
|
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a><span class="w"> </span><span class="n">msg</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>
|
|
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="w"> </span><span class="n">echo</span><span class="w"> </span><span class="s">"2 - Dst Received: "</span><span class="p">,</span><span class="w"> </span><span class="n">msg</span>
|
|
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="w"> </span><span class="n">assert</span><span class="w"> </span><span class="s">"test3"</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">msg</span>
|
|
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></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">"test4"</span><span class="p">)</span>
|
|
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a>
|
|
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a><span class="w"> </span><span class="k">let</span>
|
|
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a><span class="w"> </span><span class="n">relay</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Relay</span><span class="p">.</span><span class="n">new</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">clSrc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">RelayClient</span><span class="p">.</span><span class="n">new</span><span class="p">()</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">clDst</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">RelayClient</span><span class="p">.</span><span class="n">new</span><span class="p">()</span>
|
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<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a>
|
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<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a><span class="w"> </span><span class="c"># Create three hosts, enable relay client on two of them.</span>
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<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a><span class="w"> </span><span class="c"># The third one can relay connections for other peers.</span>
|
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<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a><span class="w"> </span><span class="c"># RelayClient can use a relay, Relay is a relay.</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="n">swRel</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">createCircuitRelaySwitch</span><span class="p">(</span><span class="n">relay</span><span class="p">)</span>
|
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<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a><span class="w"> </span><span class="n">swSrc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">createCircuitRelaySwitch</span><span class="p">(</span><span class="n">clSrc</span><span class="p">)</span>
|
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<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a><span class="w"> </span><span class="n">swDst</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">createCircuitRelaySwitch</span><span class="p">(</span><span class="n">clDst</span><span class="p">)</span>
|
|
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a>
|
|
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a><span class="w"> </span><span class="n">swDst</span><span class="p">.</span><span class="n">mount</span><span class="p">(</span><span class="n">proto</span><span class="p">)</span>
|
|
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a>
|
|
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">swRel</span><span class="p">.</span><span class="n">start</span><span class="p">()</span>
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<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">swSrc</span><span class="p">.</span><span class="n">start</span><span class="p">()</span>
|
|
<a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">swDst</span><span class="p">.</span><span class="n">start</span><span class="p">()</span>
|
|
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a>
|
|
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a><span class="w"> </span><span class="k">let</span>
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|
<a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a><span class="w"> </span><span class="c"># Create a relay address to swDst using swRel as the relay</span>
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<a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a><span class="w"> </span><span class="n">addrs</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">MultiAddress</span><span class="p">.</span><span class="n">init</span><span class="p">(</span><span class="o">$</span><span class="n">swRel</span><span class="p">.</span><span class="n">peerInfo</span><span class="p">.</span><span class="n">addrs</span><span class="o">[</span><span class="mi">0</span><span class="o">]</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="s">"/p2p/"</span><span class="w"> </span><span class="o">&</span>
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<a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a><span class="w"> </span><span class="o">$</span><span class="n">swRel</span><span class="p">.</span><span class="n">peerInfo</span><span class="p">.</span><span class="n">peerId</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="s">"/p2p-circuit"</span><span class="p">).</span><span class="n">get</span><span class="p">()</span>
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<a id="__codelineno-0-53" name="__codelineno-0-53" href="#__codelineno-0-53"></a>
|
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<a id="__codelineno-0-54" name="__codelineno-0-54" href="#__codelineno-0-54"></a><span class="w"> </span><span class="c"># Connect Dst to the relay</span>
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<a id="__codelineno-0-55" name="__codelineno-0-55" href="#__codelineno-0-55"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">swDst</span><span class="p">.</span><span class="n">connect</span><span class="p">(</span><span class="n">swRel</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">swRel</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-0-56" name="__codelineno-0-56" href="#__codelineno-0-56"></a>
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<a id="__codelineno-0-57" name="__codelineno-0-57" href="#__codelineno-0-57"></a><span class="w"> </span><span class="c"># Dst reserve a slot on the relay.</span>
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<a id="__codelineno-0-58" name="__codelineno-0-58" href="#__codelineno-0-58"></a><span class="w"> </span><span class="k">let</span><span class="w"> </span><span class="n">rsvp</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">clDst</span><span class="p">.</span><span class="n">reserve</span><span class="p">(</span><span class="n">swRel</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">swRel</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-0-59" name="__codelineno-0-59" href="#__codelineno-0-59"></a>
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<a id="__codelineno-0-60" name="__codelineno-0-60" href="#__codelineno-0-60"></a><span class="w"> </span><span class="c"># Src dial Dst using the relay</span>
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<a id="__codelineno-0-61" name="__codelineno-0-61" href="#__codelineno-0-61"></a><span class="w"> </span><span class="k">let</span><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">swSrc</span><span class="p">.</span><span class="n">dial</span><span class="p">(</span><span class="n">swDst</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="o">@[</span><span class="w"> </span><span class="n">addrs</span><span class="w"> </span><span class="o">]</span><span class="p">,</span><span class="w"> </span><span class="n">customProtoCodec</span><span class="p">)</span>
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<a id="__codelineno-0-62" name="__codelineno-0-62" href="#__codelineno-0-62"></a>
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<a id="__codelineno-0-63" name="__codelineno-0-63" href="#__codelineno-0-63"></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">"test1"</span><span class="p">)</span>
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<a id="__codelineno-0-64" name="__codelineno-0-64" href="#__codelineno-0-64"></a><span class="w"> </span><span class="kd">var</span><span class="w"> </span><span class="n">msg</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-0-65" name="__codelineno-0-65" href="#__codelineno-0-65"></a><span class="w"> </span><span class="n">echo</span><span class="w"> </span><span class="s">"1 - Src Received: "</span><span class="p">,</span><span class="w"> </span><span class="n">msg</span>
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<a id="__codelineno-0-66" name="__codelineno-0-66" href="#__codelineno-0-66"></a><span class="w"> </span><span class="n">assert</span><span class="w"> </span><span class="s">"test2"</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">msg</span>
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<a id="__codelineno-0-67" name="__codelineno-0-67" href="#__codelineno-0-67"></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">"test3"</span><span class="p">)</span>
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<a id="__codelineno-0-68" name="__codelineno-0-68" href="#__codelineno-0-68"></a><span class="w"> </span><span class="n">msg</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-0-69" name="__codelineno-0-69" href="#__codelineno-0-69"></a><span class="w"> </span><span class="n">echo</span><span class="w"> </span><span class="s">"2 - Src Received: "</span><span class="p">,</span><span class="w"> </span><span class="n">msg</span>
|
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<a id="__codelineno-0-70" name="__codelineno-0-70" href="#__codelineno-0-70"></a><span class="w"> </span><span class="n">assert</span><span class="w"> </span><span class="s">"test4"</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">msg</span>
|
|
<a id="__codelineno-0-71" name="__codelineno-0-71" href="#__codelineno-0-71"></a>
|
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<a id="__codelineno-0-72" name="__codelineno-0-72" href="#__codelineno-0-72"></a><span class="w"> </span><span class="n">await</span><span class="w"> </span><span class="n">relay</span><span class="p">.</span><span class="n">stop</span><span class="p">()</span>
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<a id="__codelineno-0-73" name="__codelineno-0-73" href="#__codelineno-0-73"></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">swSrc</span><span class="p">.</span><span class="n">stop</span><span class="p">(),</span><span class="w"> </span><span class="n">swDst</span><span class="p">.</span><span class="n">stop</span><span class="p">(),</span><span class="w"> </span><span class="n">swRel</span><span class="p">.</span><span class="n">stop</span><span class="p">())</span>
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<a id="__codelineno-0-74" name="__codelineno-0-74" href="#__codelineno-0-74"></a>
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<a id="__codelineno-0-75" name="__codelineno-0-75" href="#__codelineno-0-75"></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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</article>
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