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<link rel="search" type="application/opensearchdescription+xml" title="Centrifugo" href="/opensearch.xml">
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<p>Then there is a method <a href="https://pkg.go.dev/github.com/gorilla/websocket#Conn.WritePreparedMessage" target="_blank" rel="noopener noreferrer">func (*Conn) WritePreparedMessage</a>, which should be used to write data to all connections interested in a message — the proper WebSocket frame will be created once and then automatically re-used. By the way, this is an example of the <a href="https://github.com/gorilla/websocket/blob/ce903f6d1d961af3a8602f2842c8b1c3fca58c4d/prepared.go#L72" target="_blank" rel="noopener noreferrer">elegant use</a> of <code>sync.Once</code>.</p>
<div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockTitle_Ktv7">Using PreparedMessage</div><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">preparedMessage</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">_</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> websocket</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">NewPreparedMessage</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">websocket</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">TextMessage</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> data</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token boolean" style="color:rgb(255, 88, 116)">_</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> conn</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">WritePreparedMessage</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">preparedMessage</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</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" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
<p>This means that if we broadcast the same prepared message to many connections, we remove the excessive load on <code>sync.Pool</code>, just taking a one <code>flate.Writer</code> from the pool instead of many. This way, we avoid large memory spikes due to big size of <code>flate.Writer</code> objects and <code>sync.Pool</code> growth.</p>
<p>For broadcasts, <code>PreparedMessage</code> approach significantly reduces CPU usage by minimizing the need to construct and compress WebSocket frames, especially as the number of concurrent subscribers increases. Additionally, it reduces the allocation of large <code>flate.Writer</code> objects, further optimizing CPU utilization.</p>
<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="preparedmessage-cache">PreparedMessage cache<a href="#preparedmessage-cache" class="hash-link" aria-label="Direct link to PreparedMessage cache" title="Direct link to PreparedMessage cache">​</a></h2>
<p>For Centrifuge/Centrifugo though, we couldn&#x27;t directly use <code>PreparedMessage</code> in the part of the code responsible for preparing messages for channel broadcasts. This is because doing so would introduce a dependency on a WebSocket-specific type in a layer of code that should remain agnostic to the underlying real-time transport.</p>
<p>To avoid this, we chose not to rely on the <code>PreparedMessage</code> type in the broadcasting preparation layer. Instead, we implemented a cache of <code>PreparedMessage</code> types within the WebSocket transport implementation layer.</p>
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