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<span>Wire Protocol Specification</span>
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</script><p>This document specifies the wire protocol used for communication between Geode clients and servers. The protocol uses <strong>length-prefixed Protobuf messages</strong> over QUIC (default) or gRPC.</p>
<h3 id="overview" class="position-relative d-flex align-items-center group">
<span>Overview</span>
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</h3>
<h4 id="protocol-characteristics" class="position-relative d-flex align-items-center group">
<span>Protocol Characteristics</span>
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</h4><table>
<thead>
<tr>
<th>Property</th>
<th>Value</th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Transport</strong></td>
<td>QUIC (RFC 9000), optional gRPC (HTTP/2)</td>
</tr>
<tr>
<td><strong>Encryption</strong></td>
<td>TLS 1.3 (mandatory for QUIC)</td>
</tr>
<tr>
<td><strong>Message Format</strong></td>
<td>Protobuf (length-prefixed)</td>
</tr>
<tr>
<td><strong>Default Port</strong></td>
<td>3141 (standard), 8443 (alternative)</td>
</tr>
<tr>
<td><strong>Protocol Version</strong></td>
<td>1</td>
</tr>
</tbody>
</table>
<h4 id="key-features" class="position-relative d-flex align-items-center group">
<span>Key Features</span>
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</h4><ul>
<li><strong>Mandatory Encryption</strong>: QUIC always uses TLS 1.3</li>
<li><strong>Multiplexed Streams</strong>: Multiple queries over a single connection</li>
<li><strong>Streaming Results</strong>: Paginated result sets with flow control</li>
<li><strong>0-RTT Resumption</strong>: Fast QUIC connection establishment</li>
<li><strong>Connection Migration</strong>: Seamless network changes</li>
</ul>
<h3 id="transport-layer" class="position-relative d-flex align-items-center group">
<span>Transport Layer</span>
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</h3>
<h4 id="quic-connection" class="position-relative d-flex align-items-center group">
<span>QUIC Connection</span>
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</h4><p>Geode uses QUIC by default (with optional gRPC). There is no TCP fallback for the QUIC transport. QUIC provides:</p>
<ul>
<li>Built-in encryption (TLS 1.3)</li>
<li>Connection multiplexing</li>
<li>Stream-level flow control</li>
<li>Connection migration</li>
<li>Reduced latency (0-RTT)</li>
</ul>
<p><strong>ALPN</strong>: QUIC uses <code>geode/1</code> as the negotiated ALPN protocol.</p>
<h4 id="connection-establishment" class="position-relative d-flex align-items-center group">
<span>Connection Establishment</span>
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</h4><div class="highlight"><pre tabindex="0" class="chroma"><code class="language-plaintext" data-lang="plaintext"><span class="line"><span class="cl">Client Server
</span></span><span class="line"><span class="cl"> | |
</span></span><span class="line"><span class="cl"> |-------- QUIC Handshake ---------->|
</span></span><span class="line"><span class="cl"> |<------- TLS 1.3 Negotiation ------|
</span></span><span class="line"><span class="cl"> | |
</span></span><span class="line"><span class="cl"> |-------- HELLO Message ----------->|
</span></span><span class="line"><span class="cl"> |<------- HELLO_ACK ----------------|
</span></span><span class="line"><span class="cl"> | |
</span></span><span class="line"><span class="cl"> | Connection Ready |
</span></span></code></pre></div>
<h3 id="message-format" class="position-relative d-flex align-items-center group">
<span>Message Format</span>
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</h3>
<h4 id="protobuf-framing" class="position-relative d-flex align-items-center group">
<span>Protobuf Framing</span>
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</h4><p>All client/server messages are Protobuf messages defined in <code>src/proto/geode.proto</code>. Over QUIC, messages are <strong>length-prefixed</strong> to support streaming and multiplexed message boundaries. Over gRPC, the same Protobuf schema is used via standard gRPC framing.</p>
<p><strong>Top-level wrappers</strong>:</p>
<ul>
<li><code>ClientPacket</code> → <code>QuicClientMessage</code></li>
<li><code>ServerPacket</code> → <code>QuicServerMessage</code></li>
</ul>
<h3 id="client-messages" class="position-relative d-flex align-items-center group">
<span>Client Messages</span>
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</h3>
<h4 id="hello-hellorequest" class="position-relative d-flex align-items-center group">
<span>HELLO (<code>HelloRequest</code>)</span>
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</h4><p>Initiates connection handshake and authentication.</p>
<p>Key fields:</p>
<ul>
<li><code>username</code>, <code>password</code></li>
<li><code>tenant_id</code> (optional)</li>
<li><code>client_name</code>, <code>client_version</code></li>
<li><code>wanted_conformance</code></li>
</ul>
<h4 id="run_gql-executerequest" class="position-relative d-flex align-items-center group">
<span>RUN_GQL (<code>ExecuteRequest</code>)</span>
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</h4><p>Executes a GQL query or statement.</p>
<p>Key fields:</p>
<ul>
<li><code>session_id</code></li>
<li><code>query</code></li>
<li><code>params</code> (repeated <code>Param { name, value }</code>)</li>
</ul>
<h4 id="pull-pullrequest" class="position-relative d-flex align-items-center group">
<span>PULL (<code>PullRequest</code>)</span>
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</h4><p>Requests the next page of results.</p>
<p>Key fields:</p>
<ul>
<li><code>request_id</code></li>
<li><code>page_size</code></li>
<li><code>session_id</code> (required for gRPC; ignored for QUIC)</li>
</ul>
<h4 id="transaction-control" class="position-relative d-flex align-items-center group">
<span>Transaction Control</span>
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</h4><ul>
<li><code>BeginRequest</code></li>
<li><code>CommitRequest</code></li>
<li><code>RollbackRequest</code></li>
<li><code>SavepointRequest</code></li>
<li><code>RollbackToRequest</code></li>
</ul>
<h3 id="server-responses" class="position-relative d-flex align-items-center group">
<span>Server Responses</span>
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</h3><p>All responses are encoded in <code>ExecutionResponse</code> with a <code>status</code> object and a typed payload:</p>
<ul>
<li><code>SchemaDefinition</code> (column names/types)</li>
<li><code>DataPage</code> (rows + ordering metadata)</li>
<li><code>Error</code> (code/message)</li>
<li><code>ExplainPayload</code></li>
<li><code>ProfilePayload</code></li>
<li><code>ExecutionMetrics</code> (parse/plan/execute timings)</li>
</ul>
<h4 id="status-and-diagnostics" class="position-relative d-flex align-items-center group">
<span>Status and Diagnostics</span>
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</h4><p>Every response carries a <code>Status</code> object:</p>
<ul>
<li><code>status_class</code> (ISO/IEC 39075 codes; e.g., <code>00000</code> success)</li>
<li><code>status_subclass</code> (optional)</li>
<li><code>additional_statuses</code> (e.g., <code>US001</code>, <code>ExecutionGuardTrip</code>)</li>
<li><code>flagger_findings</code> (implementation-defined or dependent behaviors)</li>
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<h3 id="pagination" class="position-relative d-flex align-items-center group">
<span>Pagination</span>
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</h3><p>Results are paginated via <code>PULL</code> requests and <code>DataPage</code> payloads.</p>
<ul>
<li><code>page_size=0</code> defaults to 1000</li>
<li><code>final=true</code> marks the last page</li>
<li>A <code>PULL</code> after <code>final=true</code> returns <code>NoResult</code></li>
<li><code>ordered</code> and <code>order_keys</code> indicate ordering guarantees</li>
</ul>
<p><strong>Policy</strong>: LIMIT/OFFSET without <code>ORDER BY</code> is rejected with diagnostic <code>US001</code>.</p>
<h3 id="explain--profile" class="position-relative d-flex align-items-center group">
<span>Explain &amp; Profile</span>
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class="h-share btn btn-link p-0 text-decoration-none link-secondary opacity-50 hover-opacity-100 transition-all ms-1"
data-share-target="explain--profile"
aria-haspopup="dialog"
aria-label="Share link: Explain &amp; Profile">
<i class="fa-sharp-duotone fa-solid fa-share-nodes" aria-hidden="true" style="font-size: 0.8em;"></i>
<span class="visually-hidden">Share link</span>
</button>
</h3><p><code>ExplainPayload</code> and <code>ProfilePayload</code> are delivered via <code>ExecutionResponse</code> and are additive across releases. Clients should ignore unknown fields for forward compatibility.</p>
<h3 id="stability--compatibility" class="position-relative d-flex align-items-center group">
<span>Stability &amp; Compatibility</span>
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aria-label="Share link: Stability &amp; Compatibility">
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</h3><ul>
<li>Wire changes are additive within a major version</li>
<li>Removals or incompatible renames require a major bump</li>
<li>Clients should be tolerant of unknown fields</li>
</ul>
<h3 id="related-documentation" class="position-relative d-flex align-items-center group">
<span>Related Documentation</span>
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</h3><ul>
<li><a
href="/docs/reference/dsn/"
>DSN Specification</a>
</li>
<li><a
href="/docs/reference/cli-and-api/"
>CLI and API Reference</a>
</li>
<li><a
href="/docs/gql/conformance-profile/"
>GQL Conformance Profile</a>
</li>
</ul>
Wire Protocol
Complete wire protocol specification for Geode client-server communication including QUIC/gRPC transport, Protobuf messages, and pagination