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<meta name="description" content="In this specification, we describe a method to construct message history that will aid the consistency guarantees of 2/MVDS. Additionally, we explain how data sync can be used for more lightweight messages that do not require full synchronization.
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Motivation # In order for more efficient synchronization of conversational messages, information should be provided allowing a node to more effectively synchronize the dependencies for any given message.
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Format # We introduce the metadata message which is used to convey information about a message and how it SHOULD be handled.">
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<meta property="og:description" content="In this specification, we describe a method to construct message history that will aid the consistency guarantees of 2/MVDS. Additionally, we explain how data sync can be used for more lightweight messages that do not require full synchronization.
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Motivation # In order for more efficient synchronization of conversational messages, information should be provided allowing a node to more effectively synchronize the dependencies for any given message.
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Format # We introduce the metadata message which is used to convey information about a message and how it SHOULD be handled." />
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<li>Raw
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<li><a href="/spec/20/">20/TOY-ETH-PM</a></li>
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<li>Draft
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<li><a href="/spec/4/"class=active>4/MVDS-META</a></li>
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<li><a href="/spec/17/">17/WAKU2-RLN-RELAY</a></li>
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<li><a href="/spec/18/">18/WAKU2-SWAP</a></li>
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<li><a href="/spec/19/">19/WAKU2-LIGHTPUSH</a></li>
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<li><a href="/spec/21/">21/WAKU2-FTSTORE</a></li>
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<li><a href="/spec/22/">22/TOY-CHAT</a></li>
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<li><a href="/spec/23/">23/WAKU2-TOPICS</a></li>
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<li><a href="/spec/26/">26/WAKU2-PAYLOAD</a></li>
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<li><a href="/spec/27/">27/WAKU2-PEERS</a></li>
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<li><a href="/spec/29/">29/WAKU2-CONFIG</a></li>
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<li><a href="/spec/30/">30/ADAPTIVE-NODES</a></li>
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<li><a href="/spec/33/">33/WAKU2-DISCV5</a></li>
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<li><a href="/spec/36/">36/WAKU2-BINDINGS-API</a></li>
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<li><a href="/spec/53/">53/WAKU2-X3DH</a></li>
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<li><a href="/spec/54/">54/WAKU2-X3DH-SESSIONS</a></li>
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<li><a href="/spec/55/">55/STATUS-1TO1-CHAT</a></li>
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<li><a href="/spec/56/">56/STATUS-COMMUNITIES</a></li>
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</ul>
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</li>
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<li>Stable
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<ul>
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<li><a href="/spec/2/">2/MVDS</a></li>
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<li><a href="/spec/6/">6/WAKU1</a></li>
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<li><a href="/spec/7/">7/WAKU-DATA</a></li>
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<li><a href="/spec/8/">8/WAKU-MAIL</a></li>
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<li><a href="/spec/9/">9/WAKU-RPC</a></li>
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<li><a href="/spec/11/">11/WAKU2-RELAY</a></li>
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<li><a href="/spec/5/">5/WAKU0</a></li>
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<li>Retired</li>
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<li><a href="#motivation">Motivation</a></li>
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<li><a href="#format">Format</a>
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<ul>
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<li><a href="#fields">Fields</a></li>
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<li><a href="#usage">Usage</a>
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<ul>
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<li><a href="#parents"><code>parents</code></a></li>
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<li><a href="#ephemeral"><code>ephemeral</code></a></li>
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<article class="markdown">
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<h1 id="4mvds-meta">
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4/MVDS-META
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<a class="anchor" href="#4mvds-meta">#</a>
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</h1>
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<h1 id="mvds-metadata-field">
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MVDS Metadata Field
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<a class="anchor" href="#mvds-metadata-field">#</a>
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</h1>
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<img src="https://img.shields.io/badge/status-draft-blue?style=flat-square" />
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<ul>
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<li>Status: draft</li>
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<li>Editor: Sanaz Taheri <a href="mailto:sanaz@status.im">sanaz@status.im</a></li>
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<li>Contributors:
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Dean Eigenmann <a href="mailto:dean@status.im">dean@status.im</a>
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,
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Andrea Maria Piana <a href="mailto:andreap@status.im">andreap@status.im</a>
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,
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Oskar Thorén <a href="mailto:oskar@status.im">oskar@status.im</a>
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</li>
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</ul><p>In this specification, we describe a method to construct message history that will aid the consistency guarantees of <a href="/spec/2">2/MVDS</a>. Additionally, we explain how data sync can be used for more lightweight messages that do not require full synchronization.</p>
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<h2 id="motivation">
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Motivation
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<a class="anchor" href="#motivation">#</a>
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</h2>
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<p>In order for more efficient synchronization of conversational messages, information should be provided allowing a node to more effectively synchronize the dependencies for any given message.</p>
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<h2 id="format">
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Format
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<a class="anchor" href="#format">#</a>
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</h2>
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<p>We introduce the metadata message which is used to convey information about a message and how it SHOULD be handled.</p>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-protobuf" data-lang="protobuf"><span style="display:flex;"><span><span style="color:#f92672">package</span> vac<span style="color:#f92672">.</span>mvds;<span style="color:#960050;background-color:#1e0010">
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</span></span></span><span style="display:flex;"><span><span style="color:#960050;background-color:#1e0010">
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</span></span></span><span style="display:flex;"><span><span style="color:#960050;background-color:#1e0010"></span><span style="color:#66d9ef">message</span> <span style="color:#a6e22e">Metadata</span> {<span style="color:#960050;background-color:#1e0010">
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</span></span></span><span style="display:flex;"><span><span style="color:#960050;background-color:#1e0010"></span> <span style="color:#66d9ef">repeated</span> <span style="color:#66d9ef">bytes</span> parents <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>;<span style="color:#960050;background-color:#1e0010">
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</span></span></span><span style="display:flex;"><span><span style="color:#960050;background-color:#1e0010"></span> <span style="color:#66d9ef">bool</span> ephemeral <span style="color:#f92672">=</span> <span style="color:#ae81ff">2</span>;<span style="color:#960050;background-color:#1e0010">
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</span></span></span><span style="display:flex;"><span><span style="color:#960050;background-color:#1e0010"></span>}<span style="color:#960050;background-color:#1e0010">
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</span></span></span></code></pre></div><p>Nodes MAY transmit a <code>Metadata</code> message by extending the MVDS <a href="/spec/2#payloads">message</a> with a <code>metadata</code> field.</p>
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<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-diff" data-lang="diff"><span style="display:flex;"><span>message Message {
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</span></span><span style="display:flex;"><span> bytes group_id = 6001;
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</span></span><span style="display:flex;"><span> int64 timestamp = 6002;
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</span></span><span style="display:flex;"><span> bytes body = 6003;
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</span></span><span style="display:flex;"><span><span style="color:#a6e22e">+ Metadata metadata = 6004;
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</span></span></span><span style="display:flex;"><span><span style="color:#a6e22e"></span>}
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</span></span></code></pre></div><h3 id="fields">
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Fields
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<a class="anchor" href="#fields">#</a>
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</h3>
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<table>
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<thead>
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<tr>
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<th>Name</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>parents</code></td>
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<td>list of parent <a href="/spec/2#payloads"><code>message identifier</code>s</a> for the specific message.</td>
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</tr>
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<tr>
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<td><code>ephemeral</code></td>
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<td>indicates whether a message is ephemeral or not.</td>
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</tr>
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</tbody>
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</table>
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<h2 id="usage">
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Usage
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<a class="anchor" href="#usage">#</a>
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</h2>
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<h3 id="parents">
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<code>parents</code>
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<a class="anchor" href="#parents">#</a>
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</h3>
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<p>This field contains a list of parent <a href="/spec/2#payloads"><code>message identifier</code>s</a> for the specific message. It MUST NOT contain any messages as parent whose <code>ack</code> flag was set to <code>false</code>. This establishes a directed acyclic graph (DAG)<sup id="fnref:1"><a href="#fn:1" class="footnote-ref" role="doc-noteref">1</a></sup> of persistent messages.</p>
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<p>Nodes MAY buffer messages until dependencies are satisfied for causal consistency<sup id="fnref:2"><a href="#fn:2" class="footnote-ref" role="doc-noteref">2</a></sup>, they MAY also pass the messages straight away for eventual consistency<sup id="fnref:3"><a href="#fn:3" class="footnote-ref" role="doc-noteref">3</a></sup>.</p>
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<p>A parent is any message before a new message that a node is aware of that has no children.</p>
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<p>The number of parents for a given message is bound by [0, N], where N is the number of nodes participating in the conversation, therefore the space requirements for the <code>parents</code> field is O(N).</p>
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<p>If a message has no parents it is considered a root. There can be multiple roots, which might be disconnected, giving rise to multiple DAGs.</p>
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<h3 id="ephemeral">
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<code>ephemeral</code>
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<a class="anchor" href="#ephemeral">#</a>
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</h3>
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<p>When the <code>ephemeral</code> flag is set to <code>false</code>, a node MUST send an acknowledgment when they have received and processed a message. If it is set to <code>true</code>, it SHOULD NOT send any acknowledgment. The flag is <code>false</code> by default.</p>
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<p>Nodes MAY decide to not persist ephemeral messages, however they MUST NOT be shared as part of the message history.</p>
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<p>Nodes SHOULD send ephemeral messages in batch mode. As their delivery is not needed to be guaranteed.</p>
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<h2 id="copyright">
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Copyright
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<a class="anchor" href="#copyright">#</a>
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</h2>
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<p>Copyright and related rights waived via <a href="https://creativecommons.org/publicdomain/zero/1.0/">CC0</a>.</p>
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<h2 id="footnotes">
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Footnotes
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<a class="anchor" href="#footnotes">#</a>
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</h2>
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<div class="footnotes" role="doc-endnotes">
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<hr>
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<ol>
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<li id="fn:1">
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<p><a href="https://en.wikipedia.org/wiki/Directed_acyclic_graph">https://en.wikipedia.org/wiki/Directed_acyclic_graph</a> <a href="#fnref:1" class="footnote-backref" role="doc-backlink">↩︎</a></p>
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</li>
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<li id="fn:2">
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<p>Jepsen. <a href="https://jepsen.io/consistency/models/causal">Causal Consistency</a>. Jepsen, LLC. <a href="#fnref:2" class="footnote-backref" role="doc-backlink">↩︎</a></p>
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</li>
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<li id="fn:3">
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<p><a href="https://en.wikipedia.org/wiki/Eventual_consistency">https://en.wikipedia.org/wiki/Eventual_consistency</a> <a href="#fnref:3" class="footnote-backref" role="doc-backlink">↩︎</a></p>
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