393 lines
18 KiB
HTML
393 lines
18 KiB
HTML
|
<!DOCTYPE HTML>
|
||
|
|
<html lang="en" class="light sidebar-visible" dir="ltr">
|
||
|
|
<head>
|
||
|
|
<!-- Book generated using mdBook -->
|
||
|
|
<meta charset="UTF-8">
|
||
|
|
<title>0008: Tokio Runtime - VAPORA Platform Documentation</title>
|
||
|
|
|
||
|
|
|
||
|
|
<!-- Custom HTML head -->
|
||
|
|
|
||
|
|
<meta name="description" content="Comprehensive documentation for VAPORA, an intelligent development orchestration platform built entirely in Rust.">
|
||
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||
|
|
<meta name="theme-color" content="#ffffff">
|
||
|
|
|
||
|
|
<link rel="icon" href="../favicon.svg">
|
||
|
|
<link rel="shortcut icon" href="../favicon.png">
|
||
|
|
<link rel="stylesheet" href="../css/variables.css">
|
||
|
|
<link rel="stylesheet" href="../css/general.css">
|
||
|
|
<link rel="stylesheet" href="../css/chrome.css">
|
||
|
|
<link rel="stylesheet" href="../css/print.css" media="print">
|
||
|
|
|
||
|
|
<!-- Fonts -->
|
||
|
|
<link rel="stylesheet" href="../FontAwesome/css/font-awesome.css">
|
||
|
|
<link rel="stylesheet" href="../fonts/fonts.css">
|
||
|
|
|
||
|
|
<!-- Highlight.js Stylesheets -->
|
||
|
|
<link rel="stylesheet" id="highlight-css" href="../highlight.css">
|
||
|
|
<link rel="stylesheet" id="tomorrow-night-css" href="../tomorrow-night.css">
|
||
|
|
<link rel="stylesheet" id="ayu-highlight-css" href="../ayu-highlight.css">
|
||
|
|
|
||
|
|
<!-- Custom theme stylesheets -->
|
||
|
|
|
||
|
|
|
||
|
|
<!-- Provide site root and default themes to javascript -->
|
||
|
|
<script>
|
||
|
|
const path_to_root = "../";
|
||
|
|
const default_light_theme = "light";
|
||
|
|
const default_dark_theme = "dark";
|
||
|
|
</script>
|
||
|
|
<!-- Start loading toc.js asap -->
|
||
|
|
<script src="../toc.js"></script>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div id="mdbook-help-container">
|
||
|
|
<div id="mdbook-help-popup">
|
||
|
|
<h2 class="mdbook-help-title">Keyboard shortcuts</h2>
|
||
|
|
<div>
|
||
|
|
<p>Press <kbd>←</kbd> or <kbd>→</kbd> to navigate between chapters</p>
|
||
|
|
<p>Press <kbd>S</kbd> or <kbd>/</kbd> to search in the book</p>
|
||
|
|
<p>Press <kbd>?</kbd> to show this help</p>
|
||
|
|
<p>Press <kbd>Esc</kbd> to hide this help</p>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div id="body-container">
|
||
|
|
<!-- Work around some values being stored in localStorage wrapped in quotes -->
|
||
|
|
<script>
|
||
|
|
try {
|
||
|
|
let theme = localStorage.getItem('mdbook-theme');
|
||
|
|
let sidebar = localStorage.getItem('mdbook-sidebar');
|
||
|
|
|
||
|
|
if (theme.startsWith('"') && theme.endsWith('"')) {
|
||
|
|
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
|
||
|
|
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
|
||
|
|
}
|
||
|
|
} catch (e) { }
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<!-- Set the theme before any content is loaded, prevents flash -->
|
||
|
|
<script>
|
||
|
|
const default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? default_dark_theme : default_light_theme;
|
||
|
|
let theme;
|
||
|
|
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
|
||
|
|
if (theme === null || theme === undefined) { theme = default_theme; }
|
||
|
|
const html = document.documentElement;
|
||
|
|
html.classList.remove('light')
|
||
|
|
html.classList.add(theme);
|
||
|
|
html.classList.add("js");
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<input type="checkbox" id="sidebar-toggle-anchor" class="hidden">
|
||
|
|
|
||
|
|
<!-- Hide / unhide sidebar before it is displayed -->
|
||
|
|
<script>
|
||
|
|
let sidebar = null;
|
||
|
|
const sidebar_toggle = document.getElementById("sidebar-toggle-anchor");
|
||
|
|
if (document.body.clientWidth >= 1080) {
|
||
|
|
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
|
||
|
|
sidebar = sidebar || 'visible';
|
||
|
|
} else {
|
||
|
|
sidebar = 'hidden';
|
||
|
|
}
|
||
|
|
sidebar_toggle.checked = sidebar === 'visible';
|
||
|
|
html.classList.remove('sidebar-visible');
|
||
|
|
html.classList.add("sidebar-" + sidebar);
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
|
||
|
|
<!-- populated by js -->
|
||
|
|
<mdbook-sidebar-scrollbox class="sidebar-scrollbox"></mdbook-sidebar-scrollbox>
|
||
|
|
<noscript>
|
||
|
|
<iframe class="sidebar-iframe-outer" src="../toc.html"></iframe>
|
||
|
|
</noscript>
|
||
|
|
<div id="sidebar-resize-handle" class="sidebar-resize-handle">
|
||
|
|
<div class="sidebar-resize-indicator"></div>
|
||
|
|
</div>
|
||
|
|
</nav>
|
||
|
|
|
||
|
|
<div id="page-wrapper" class="page-wrapper">
|
||
|
|
|
||
|
|
<div class="page">
|
||
|
|
<div id="menu-bar-hover-placeholder"></div>
|
||
|
|
<div id="menu-bar" class="menu-bar sticky">
|
||
|
|
<div class="left-buttons">
|
||
|
|
<label id="sidebar-toggle" class="icon-button" for="sidebar-toggle-anchor" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
|
||
|
|
<i class="fa fa-bars"></i>
|
||
|
|
</label>
|
||
|
|
<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
|
||
|
|
<i class="fa fa-paint-brush"></i>
|
||
|
|
</button>
|
||
|
|
<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="default_theme">Auto</button></li>
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="light">Light</button></li>
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
|
||
|
|
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
|
||
|
|
</ul>
|
||
|
|
<button id="search-toggle" class="icon-button" type="button" title="Search (`/`)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="/ s" aria-controls="searchbar">
|
||
|
|
<i class="fa fa-search"></i>
|
||
|
|
</button>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h1 class="menu-title">VAPORA Platform Documentation</h1>
|
||
|
|
|
||
|
|
<div class="right-buttons">
|
||
|
|
<a href="../print.html" title="Print this book" aria-label="Print this book">
|
||
|
|
<i id="print-button" class="fa fa-print"></i>
|
||
|
|
</a>
|
||
|
|
<a href="https://github.com/vapora-platform/vapora" title="Git repository" aria-label="Git repository">
|
||
|
|
<i id="git-repository-button" class="fa fa-github"></i>
|
||
|
|
</a>
|
||
|
|
<a href="https://github.com/vapora-platform/vapora/edit/main/docs/src/../adrs/0008-tokio-runtime.md" title="Suggest an edit" aria-label="Suggest an edit">
|
||
|
|
<i id="git-edit-button" class="fa fa-edit"></i>
|
||
|
|
</a>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div id="search-wrapper" class="hidden">
|
||
|
|
<form id="searchbar-outer" class="searchbar-outer">
|
||
|
|
<input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
|
||
|
|
</form>
|
||
|
|
<div id="searchresults-outer" class="searchresults-outer hidden">
|
||
|
|
<div id="searchresults-header" class="searchresults-header"></div>
|
||
|
|
<ul id="searchresults">
|
||
|
|
</ul>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
|
||
|
|
<script>
|
||
|
|
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
|
||
|
|
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
|
||
|
|
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
|
||
|
|
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
|
||
|
|
});
|
||
|
|
</script>
|
||
|
|
|
||
|
|
<div id="content" class="content">
|
||
|
|
<main>
|
||
|
|
<h1 id="adr-008-tokio-multi-threaded-runtime"><a class="header" href="#adr-008-tokio-multi-threaded-runtime">ADR-008: Tokio Multi-Threaded Runtime</a></h1>
|
||
|
|
<p><strong>Status</strong>: Accepted | Implemented
|
||
|
|
<strong>Date</strong>: 2024-11-01
|
||
|
|
<strong>Deciders</strong>: Runtime Architecture Team
|
||
|
|
<strong>Technical Story</strong>: Selecting async runtime for I/O-heavy workload (API, DB, LLM calls)</p>
|
||
|
|
<hr />
|
||
|
|
<h2 id="decision"><a class="header" href="#decision">Decision</a></h2>
|
||
|
|
<p>Usar <strong>Tokio multi-threaded runtime</strong> con configuración default (no single-threaded, no custom thread pool).</p>
|
||
|
|
<hr />
|
||
|
|
<h2 id="rationale"><a class="header" href="#rationale">Rationale</a></h2>
|
||
|
|
<ol>
|
||
|
|
<li><strong>I/O-Heavy Workload</strong>: VAPORA hace many concurrent calls (SurrealDB, NATS, LLM APIs, WebSockets)</li>
|
||
|
|
<li><strong>Multi-Core Scalability</strong>: Multi-threaded distributes work across cores eficientemente</li>
|
||
|
|
<li><strong>Production-Ready</strong>: Tokio es de-facto estándar en Rust async ecosystem</li>
|
||
|
|
<li><strong>Minimal Config Overhead</strong>: Default settings tuned para la mayoría de casos</li>
|
||
|
|
</ol>
|
||
|
|
<hr />
|
||
|
|
<h2 id="alternatives-considered"><a class="header" href="#alternatives-considered">Alternatives Considered</a></h2>
|
||
|
|
<h3 id="-single-threaded-tokio-tokiomain-single_threaded"><a class="header" href="#-single-threaded-tokio-tokiomain-single_threaded">❌ Single-Threaded Tokio (<code>tokio::main</code> single_threaded)</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li><strong>Pros</strong>: Simpler to debug, predictable ordering</li>
|
||
|
|
<li><strong>Cons</strong>: Single core only, no scaling, inadequate for concurrent workload</li>
|
||
|
|
</ul>
|
||
|
|
<h3 id="-custom-threadpool"><a class="header" href="#-custom-threadpool">❌ Custom ThreadPool</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li><strong>Pros</strong>: Full control</li>
|
||
|
|
<li><strong>Cons</strong>: Manual scheduling, error-prone, maintenance burden</li>
|
||
|
|
</ul>
|
||
|
|
<h3 id="-tokio-multi-threaded-chosen"><a class="header" href="#-tokio-multi-threaded-chosen">✅ Tokio Multi-Threaded (CHOSEN)</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li>Production-ready, well-tuned, scales across cores</li>
|
||
|
|
</ul>
|
||
|
|
<hr />
|
||
|
|
<h2 id="trade-offs"><a class="header" href="#trade-offs">Trade-offs</a></h2>
|
||
|
|
<p><strong>Pros</strong>:</p>
|
||
|
|
<ul>
|
||
|
|
<li>✅ Scales across all CPU cores</li>
|
||
|
|
<li>✅ Efficient I/O multiplexing (epoll on Linux, kqueue on macOS)</li>
|
||
|
|
<li>✅ Proven in production systems</li>
|
||
|
|
<li>✅ Built-in task spawning with <code>tokio::spawn</code></li>
|
||
|
|
<li>✅ Graceful shutdown handling</li>
|
||
|
|
</ul>
|
||
|
|
<p><strong>Cons</strong>:</p>
|
||
|
|
<ul>
|
||
|
|
<li>⚠️ More complex debugging (multiple threads)</li>
|
||
|
|
<li>⚠️ Potential data race if <code>Send/Sync</code> bounds not respected</li>
|
||
|
|
<li>⚠️ Memory overhead (per-thread stacks)</li>
|
||
|
|
</ul>
|
||
|
|
<hr />
|
||
|
|
<h2 id="implementation"><a class="header" href="#implementation">Implementation</a></h2>
|
||
|
|
<p><strong>Runtime Configuration</strong>:</p>
|
||
|
|
<pre><pre class="playground"><code class="language-rust">// crates/vapora-backend/src/main.rs:26
|
||
|
|
#[tokio::main]
|
||
|
|
async fn main() -> Result<()> {
|
||
|
|
// Default: worker threads = num_cpus(), stack size = 2MB
|
||
|
|
// Equivalent to:
|
||
|
|
// let rt = tokio::runtime::Builder::new_multi_thread()
|
||
|
|
// .worker_threads(num_cpus::get())
|
||
|
|
// .enable_all()
|
||
|
|
// .build()?;
|
||
|
|
}</code></pre></pre>
|
||
|
|
<p><strong>Async Task Spawning</strong>:</p>
|
||
|
|
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
|
||
|
|
</span><span class="boring">fn main() {
|
||
|
|
</span>// Spawn independent task (runs concurrently on available worker)
|
||
|
|
tokio::spawn(async {
|
||
|
|
let result = expensive_operation().await;
|
||
|
|
handle_result(result).await;
|
||
|
|
});
|
||
|
|
<span class="boring">}</span></code></pre></pre>
|
||
|
|
<p><strong>Blocking Code in Async Context</strong>:</p>
|
||
|
|
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
|
||
|
|
</span><span class="boring">fn main() {
|
||
|
|
</span>// Block sync code without blocking entire executor
|
||
|
|
let result = tokio::task::block_in_place(|| {
|
||
|
|
// CPU-bound work or blocking I/O (file system, etc)
|
||
|
|
expensive_computation()
|
||
|
|
});
|
||
|
|
<span class="boring">}</span></code></pre></pre>
|
||
|
|
<p><strong>Graceful Shutdown</strong>:</p>
|
||
|
|
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
|
||
|
|
</span><span class="boring">fn main() {
|
||
|
|
</span>// Listen for Ctrl+C
|
||
|
|
let shutdown = tokio::signal::ctrl_c();
|
||
|
|
|
||
|
|
tokio::select! {
|
||
|
|
_ = shutdown => {
|
||
|
|
info!("Shutting down gracefully...");
|
||
|
|
// Cancel in-flight tasks, drain channels, close connections
|
||
|
|
}
|
||
|
|
_ = run_server() => {}
|
||
|
|
}
|
||
|
|
<span class="boring">}</span></code></pre></pre>
|
||
|
|
<p><strong>Key Files</strong>:</p>
|
||
|
|
<ul>
|
||
|
|
<li><code>/crates/vapora-backend/src/main.rs:26</code> (Tokio main)</li>
|
||
|
|
<li><code>/crates/vapora-agents/src/bin/server.rs</code> (Agent server with Tokio)</li>
|
||
|
|
<li><code>/crates/vapora-llm-router/src/router.rs</code> (Concurrent LLM calls via tokio::spawn)</li>
|
||
|
|
</ul>
|
||
|
|
<hr />
|
||
|
|
<h2 id="verification"><a class="header" href="#verification">Verification</a></h2>
|
||
|
|
<pre><code class="language-bash"># Check runtime worker threads at startup
|
||
|
|
RUST_LOG=tokio=debug cargo run -p vapora-backend 2>&1 | grep "worker"
|
||
|
|
|
||
|
|
# Monitor CPU usage across cores
|
||
|
|
top -H -p $(pgrep -f vapora-backend)
|
||
|
|
|
||
|
|
# Test concurrent task spawning
|
||
|
|
cargo test -p vapora-backend test_concurrent_requests
|
||
|
|
|
||
|
|
# Profile thread behavior
|
||
|
|
cargo flamegraph --bin vapora-backend -- --profile cpu
|
||
|
|
|
||
|
|
# Stress test with load generator
|
||
|
|
wrk -t 4 -c 100 -d 30s http://localhost:8001/health
|
||
|
|
|
||
|
|
# Check task wakeups and efficiency
|
||
|
|
cargo run -p vapora-backend --release
|
||
|
|
# In another terminal:
|
||
|
|
perf record -p $(pgrep -f vapora-backend) sleep 5
|
||
|
|
perf report | grep -i "wakeup\|context"
|
||
|
|
</code></pre>
|
||
|
|
<p><strong>Expected Output</strong>:</p>
|
||
|
|
<ul>
|
||
|
|
<li>Worker threads = number of CPU cores</li>
|
||
|
|
<li>Concurrent requests handled efficiently</li>
|
||
|
|
<li>CPU usage distributed across cores</li>
|
||
|
|
<li>Low context switching overhead</li>
|
||
|
|
<li>Latency p99 < 100ms for simple endpoints</li>
|
||
|
|
</ul>
|
||
|
|
<hr />
|
||
|
|
<h2 id="consequences"><a class="header" href="#consequences">Consequences</a></h2>
|
||
|
|
<h3 id="concurrency-model"><a class="header" href="#concurrency-model">Concurrency Model</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li>Use <code>Arc<></code> for shared state (cheap clones)</li>
|
||
|
|
<li>Use <code>tokio::sync::RwLock</code>, <code>Mutex</code>, <code>broadcast</code> for synchronization</li>
|
||
|
|
<li>Avoid blocking operations in async code (use <code>block_in_place</code>)</li>
|
||
|
|
</ul>
|
||
|
|
<h3 id="error-handling"><a class="header" href="#error-handling">Error Handling</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li>Panics in spawned tasks don't kill runtime (captured via <code>JoinHandle</code>)</li>
|
||
|
|
<li>Use <code>.await?</code> for proper error propagation</li>
|
||
|
|
<li>Set panic hook for graceful degradation</li>
|
||
|
|
</ul>
|
||
|
|
<h3 id="monitoring"><a class="header" href="#monitoring">Monitoring</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li>Track task queue depth (available via <code>tokio-console</code>)</li>
|
||
|
|
<li>Monitor executor CPU usage</li>
|
||
|
|
<li>Alert if thread starvation detected</li>
|
||
|
|
</ul>
|
||
|
|
<h3 id="performance-tuning"><a class="header" href="#performance-tuning">Performance Tuning</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li>Default settings adequate for most workloads</li>
|
||
|
|
<li>Only customize if profiling shows bottleneck</li>
|
||
|
|
<li>Typical: num_workers = num_cpus, stack size = 2MB</li>
|
||
|
|
</ul>
|
||
|
|
<hr />
|
||
|
|
<h2 id="references"><a class="header" href="#references">References</a></h2>
|
||
|
|
<ul>
|
||
|
|
<li><a href="https://tokio.rs/tokio/tutorial">Tokio Documentation</a></li>
|
||
|
|
<li><a href="https://docs.rs/tokio/latest/tokio/runtime/struct.Builder.html">Tokio Runtime Configuration</a></li>
|
||
|
|
<li><code>/crates/vapora-backend/src/main.rs</code> (runtime entry point)</li>
|
||
|
|
<li><code>/crates/vapora-agents/src/bin/server.rs</code> (agent runtime)</li>
|
||
|
|
</ul>
|
||
|
|
<hr />
|
||
|
|
<p><strong>Related ADRs</strong>: ADR-001 (Workspace), ADR-005 (NATS JetStream)</p>
|
||
|
|
|
||
|
|
</main>
|
||
|
|
|
||
|
|
<nav class="nav-wrapper" aria-label="Page navigation">
|
||
|
|
<!-- Mobile navigation buttons -->
|
||
|
|
<a rel="prev" href="../../adrs/0007-multi-provider-llm.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
||
|
|
<i class="fa fa-angle-left"></i>
|
||
|
|
</a>
|
||
|
|
|
||
|
|
<a rel="next prefetch" href="../../adrs/0009-istio-service-mesh.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
|
||
|
|
<i class="fa fa-angle-right"></i>
|
||
|
|
</a>
|
||
|
|
|
||
|
|
<div style="clear: both"></div>
|
||
|
|
</nav>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<nav class="nav-wide-wrapper" aria-label="Page navigation">
|
||
|
|
<a rel="prev" href="../../adrs/0007-multi-provider-llm.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
||
|
|
<i class="fa fa-angle-left"></i>
|
||
|
|
</a>
|
||
|
|
|
||
|
|
<a rel="next prefetch" href="../../adrs/0009-istio-service-mesh.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
|
||
|
|
<i class="fa fa-angle-right"></i>
|
||
|
|
</a>
|
||
|
|
</nav>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
<script>
|
||
|
|
window.playground_copyable = true;
|
||
|
|
</script>
|
||
|
|
|
||
|
|
|
||
|
|
<script src="../elasticlunr.min.js"></script>
|
||
|
|
<script src="../mark.min.js"></script>
|
||
|
|
<script src="../searcher.js"></script>
|
||
|
|
|
||
|
|
<script src="../clipboard.min.js"></script>
|
||
|
|
<script src="../highlight.js"></script>
|
||
|
|
<script src="../book.js"></script>
|
||
|
|
|
||
|
|
<!-- Custom JS scripts -->
|
||
|
|
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|