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<h1 id="architecture"><a class="header" href="#architecture">Architecture</a></h1>
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<p>For contributors. The repo’s <code>CLAUDE.md</code> is the terse version of this;
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read both.</p>
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<h2 id="two-front-ends-one-engine"><a class="header" href="#two-front-ends-one-engine">Two front-ends, one engine</a></h2>
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<p><code>main.rs</code> dispatches: <code>--web</code> → <code>web::run()</code> (axum, blocks forever);
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otherwise <code>app::App</code> (eframe/egui desktop GUI). <strong>Both share
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<code>downloader::Downloader</code></strong>, the single source of truth for the yt-dlp job
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lifecycle.</p>
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<p><code>Downloader</code> is <strong>not</strong> async — it spawns an OS thread per yt-dlp process,
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streams stdout/stderr back over an <code>mpsc</code> channel into each <code>Job</code>’s log
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buffer, and the caller pumps <code>Downloader::poll()</code> regularly (the egui
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frame loop and a web background task both do). Anything you add to
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<code>Downloader</code> is automatically available to both UIs.</p>
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<p><code>poll()</code> also drives the cross-cutting job machinery: auto-retry of
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transient failures (cooldown + adaptive throttle), the hang watchdog, and
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the post-download ffmpeg transcode pass. These work by capturing specs
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onto the <code>Job</code> at <code>start()</code> time (<code>RetrySpec</code>, <code>ConvertSpec</code>) and acting
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on them when the job changes state.</p>
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<h2 id="the-settings-flow-the-easy-thing-to-get-wrong"><a class="header" href="#the-settings-flow-the-easy-thing-to-get-wrong">The settings flow (the easy thing to get wrong)</a></h2>
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<p>Almost every configurable feature has the same five-touchpoint shape —
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miss one and it silently half-works:</p>
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<ol>
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<li><code>config.rs</code> — a field/section + its <code>Default</code> + the <code>default_with_dir</code>
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constructor.</li>
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<li><code>download_options.rs</code> — an <code>Option<…></code> per-channel override (None =
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defer to global).</li>
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<li><code>downloader.rs</code> — a resolver merging global config + per-channel
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override into yt-dlp/ffmpeg args, plus a <code>pub</code> field on <code>Downloader</code>
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holding the global default.</li>
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<li><strong>Both</strong> UIs render the global setting <em>and</em> the per-channel override:
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desktop in <code>app.rs</code>, web in <code>web_ui/index.html</code> <strong>and</strong> <code>web.rs</code>’s
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<code>SettingsPayload</code> (GET reads config, POST writes config + pushes onto
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the live <code>Downloader</code>).</li>
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<li>Seed the <code>Downloader</code> field at construction <strong>and</strong> on settings-save,
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in <strong>both</strong> <code>app.rs</code> and <code>web.rs</code>.</li>
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</ol>
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<p><code>subtitle_defaults</code>, <code>youtube_player_clients</code>, and <code>convert_defaults</code> are
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complete worked examples — grep one end-to-end before adding a setting.</p>
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<h2 id="filesystem-layout"><a class="header" href="#filesystem-layout">Filesystem layout</a></h2>
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<p><code>platform::platform_root(channels_root, platform)</code> =
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<code>channels_root.join(dir_name)</code>. <strong>All</strong> platforms (including YouTube,
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whose <code>dir_name</code> is <code>channels</code>) nest under the one configured
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||
<code>backup.directory</code>. <code>.source-url</code> sidecars in each creator folder let
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||
re-checks recover the exact URL. Library scanning (<code>library.rs</code>) is
|
||
parallel and consults a <code>(path, mtime)</code> SQLite cache to skip re-parsing
|
||
unchanged <code>info.json</code> sidecars.</p>
|
||
<h2 id="persistence"><a class="header" href="#persistence">Persistence</a></h2>
|
||
<p><code>database.rs</code> wraps an r2d2 SQLite pool. <code>Database</code> is cheaply <code>Clone</code>
|
||
(the pool is an <code>Arc</code>), so the parallel scanner takes its own handle.
|
||
Schema lives in <code>init_schema()</code>; new columns are added via idempotent
|
||
<code>ALTER TABLE … ADD COLUMN</code> that swallows the duplicate-column error (no
|
||
migration framework). The web UI keeps library/notes snapshots in memory;
|
||
mutating endpoints mirror DB writes onto those caches and bump a version
|
||
counter (the <code>/api/library</code> ETag) so reads stay consistent without a
|
||
rescan.</p>
|
||
<p>The long-lived <code>WebState</code> mutexes are accessed via
|
||
<code>util::LockExt::lock_recover()</code>, which recovers a poisoned lock instead of
|
||
cascading one handler’s panic into a dead server.</p>
|
||
<h2 id="web-ui-is-one-embedded-file"><a class="header" href="#web-ui-is-one-embedded-file">Web UI is one embedded file</a></h2>
|
||
<p><code>web_ui/index.html</code> is the entire SPA (HTML+CSS+JS), <code>include_str!</code>-baked
|
||
into the binary at compile time — editing it requires a rebuild. Served
|
||
<code>Cache-Control: no-store</code> so binary upgrades don’t strand stale tabs.
|
||
Progress streams over <code>/ws/progress</code> (WebSocket) with an HTTP-poll
|
||
fallback.</p>
|
||
<h2 id="anti-bot-subsystems"><a class="header" href="#anti-bot-subsystems">Anti-bot subsystems</a></h2>
|
||
<p><code>ytdlp_bin.rs</code> manages the optional self-contained venv at
|
||
<code>~/.local/share/yt-offline/</code> (nightly <code>yt-dlp[default]</code> + <code>curl_cffi</code> +
|
||
bundled <code>deno</code>). <code>pot_provider.rs</code> runs <code>bgutil-pot</code> for Proof-of-Origin
|
||
tokens — its yt-dlp plugin must come from the same release as the server
|
||
binary. <code>error_class.rs</code> pattern-matches yt-dlp stderr into actionable
|
||
classes (order matters in <code>classify()</code>: the captcha “Video unavailable”
|
||
wall is RateLimited, not NotFound).</p>
|
||
<h2 id="tests"><a class="header" href="#tests">Tests</a></h2>
|
||
<ul>
|
||
<li>Unit tests are inline <code>#[cfg(test)]</code> modules (parsers, resolvers, the
|
||
error classifier, DB merge logic).</li>
|
||
<li><code>tests/api.rs</code> spawns the <strong>real</strong> <code>--web</code> binary against a scratch dir
|
||
and drives the HTTP API with curl — genuine end-to-end coverage of the
|
||
axum + SQLite + config stack.</li>
|
||
</ul>
|
||
<p><code>cargo test</code> runs both. (A <code>.forgejo/workflows/test.yml</code> CI definition
|
||
exists, but Codeberg runs Woodpecker rather than Forgejo Actions, so it
|
||
doesn’t execute there without a self-hosted runner — run the suite
|
||
locally.)</p>
|
||
<h2 id="platform-support"><a class="header" href="#platform-support">Platform support</a></h2>
|
||
<p>Tray (<code>ksni</code>) and file dialogs (<code>rfd</code> xdg-portal) are Linux-only / no-GTK
|
||
by design — that’s why packaging avoids a GTK dependency. Windows/macOS
|
||
aren’t first-class yet: the tray needs a per-OS backend before a clean
|
||
cross-build. The rest (eframe/wgpu, axum, rusqlite-bundled) already
|
||
compiles cross-platform, and <code>ytdlp_bin</code> already has <code>cfg!(windows)</code>
|
||
branches.</p>
|
||
|
||
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