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padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/dev"><span itemprop="name">Development</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Session Signaling</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Session Signaling</h1>
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<p>Lets assume two peers <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mi>P</mi><mi>a</mi></msub></mrow><annotation encoding="application/x-tex">P_a</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8333em;vertical-align:-0.15em"></span><span class="mord"><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em"><span style="top:-2.55em;margin-left:-0.1389em;margin-right:0.05em"><span class="pstrut" style="height:2.7em"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">a</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em"><span></span></span></span></span></span></span></span></span></span> & <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mi>P</mi><mi>b</mi></msub></mrow><annotation encoding="application/x-tex">P_b</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8333em;vertical-align:-0.15em"></span><span class="mord"><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3361em"><span style="top:-2.55em;margin-left:-0.1389em;margin-right:0.05em"><span class="pstrut" style="height:2.7em"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">b</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em"><span></span></span></span></span></span></span></span></span></span> are seeking to establish a ICE session.</p>
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<p>The smaller public key (PK) of the two peers takes the role of the controlling agent.
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In this example PA has the role of the controlling agent as: <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>P</mi><mi>K</mi><mo stretchy="false">(</mo><msub><mi>P</mi><mi>a</mi></msub><mo stretchy="false">)</mo><mo><</mo><mi>P</mi><mi>K</mi><mo stretchy="false">(</mo><msub><mi>P</mi><mi>b</mi></msub><mo stretchy="false">)</mo></mrow><annotation encoding="application/x-tex">PK(P_a) < PK(P_b)</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em"></span><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="mord mathnormal" style="margin-right:0.07153em">K</span><span class="mopen">(</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em"><span style="top:-2.55em;margin-left:-0.1389em;margin-right:0.05em"><span class="pstrut" style="height:2.7em"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">a</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em"><span></span></span></span></span></span></span><span class="mclose">)</span><span class="mspace" style="margin-right:0.2778em"></span><span class="mrel"><</span><span class="mspace" style="margin-right:0.2778em"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em"></span><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="mord mathnormal" style="margin-right:0.07153em">K</span><span class="mopen">(</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.13889em">P</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3361em"><span style="top:-2.55em;margin-left:-0.1389em;margin-right:0.05em"><span class="pstrut" style="height:2.7em"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">b</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em"><span></span></span></span></span></span></span><span class="mclose">)</span></span></span></span>.</p>
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<!-- -->
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<!-- -->
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="session-description">Session Description<a class="hash-link" aria-label="Direct link to Session Description" title="Direct link to Session Description" href="/docs/dev/signaling#session-description"></a></h2>
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<p>Session descriptions are exchanged by one or more the signaling backends via signaling <em>envelopes</em> which contain signaling <em>messages</em>.
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The <em>envelopes</em> are containers which encrypt the carried <em>message</em> via asymmetric cryptography using the public key of the recipient.</p>
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<p>Both the <em>envelope</em> and the <em>message</em> are serialized using Protobuf.</p>
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<p>Checkout the <a href="https://github.com/cunicu/cunicu/blob/main/proto/signaling/signaling.proto" target="_blank" rel="noopener noreferrer"><code>pkg/pb/signaling.proto</code></a> for details.</p>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="backends">Backends<a class="hash-link" aria-label="Direct link to Backends" title="Direct link to Backends" href="/docs/dev/signaling#backends"></a></h2>
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<p>cunīcu can support multiple backends for signaling session information such as session IDs, ICE candidates, public keys and STUN credentials.</p>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="available-backends">Available backends<a class="hash-link" aria-label="Direct link to Available backends" title="Direct link to Available backends" href="/docs/dev/signaling#available-backends"></a></h3>
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<ul>
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<li>gRPC</li>
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</ul>
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<p>Checkout the <a href="https://github.com/cunicu/cunicu/blob/main/pkg/signaling/backend.go" target="_blank" rel="noopener noreferrer"><code>Backend</code></a> interface for implementing your own backend.</p>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="semantics">Semantics<a class="hash-link" aria-label="Direct link to Semantics" title="Direct link to Semantics" href="/docs/dev/signaling#semantics"></a></h3>
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<p>A backend must:</p>
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<ul>
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<li>Must facilitate a reliable delivery <em>envelopes</em> between peers using their public keys as addresses.</li>
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<li>Must support delivery of <em>envelopes</em> to a group of recipients (e.g. multicast).</li>
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<li>May deliver the <em>envelopes</em> out-of-order.</li>
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<li>May discard <em>envelopes</em> if the recipient is not yet known or reachable.</li>
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<li>Shall be stateless. It shall not buffer or record any <em>envelopes</em>.</li>
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</ul>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="interface">Interface<a class="hash-link" aria-label="Direct link to Interface" title="Direct link to Interface" href="/docs/dev/signaling#interface"></a></h3>
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<p>All signaling backends implement the rather simple <a href="https://github.com/cunicu/cunicu/blob/main/pkg/signaling/backend.go" target="_blank" rel="noopener noreferrer"><code>signaling.Backend</code> interface</a>:</p>
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<div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">type</span><span class="token plain"> Message </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> pb</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">SignalingMessage</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">type</span><span class="token plain"> MessageHandler </span><span class="token keyword" style="color:#00009f">interface</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">OnSignalingMessage</span><span class="token punctuation" style="color:#393A34">(</span><span class="token operator" style="color:#393A34">*</span><span class="token plain">crypto</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">PublicKeyPair</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">Message</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">type</span><span class="token plain"> Backend </span><span class="token keyword" style="color:#00009f">interface</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> io</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">Closer</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Publish a signaling message to a specific peer</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">Publish</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ctx context</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">Context</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> kp </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">crypto</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">KeyPair</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> msg </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">Message</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token builtin">error</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Subscribe to messages send by a specific peer</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">Subscribe</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ctx context</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">Context</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> kp </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">crypto</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">KeyPair</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> h MessageHandler</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token builtin">bool</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token builtin">error</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Unsubscribe from messages send by a specific peer</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">Unsubscribe</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">ctx context</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">Context</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> kp </span><span class="token operator" style="color:#393A34">*</span><span class="token plain">crypto</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">KeyPair</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> h MessageHandler</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token builtin">bool</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> </span><span class="token builtin">error</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Returns the backends type identifier</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">Type</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> signalingproto</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">BackendType</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" 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