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<h1 id="type-synchronization--thread-safety"><a class="header" href="#type-synchronization--thread-safety">Type Synchronization & Thread Safety</a></h1>
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<h2 id="playerstate-rust---typescript"><a class="header" href="#playerstate-rust---typescript">PlayerState (Rust <-> TypeScript)</a></h2>
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<p><strong>Rust:</strong></p>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>pub enum PlayerState {
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Idle,
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Loading { media: MediaItem },
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Playing { media: MediaItem, position: f64, duration: f64 },
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Paused { media: MediaItem, position: f64, duration: f64 },
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Seeking { media: MediaItem, target: f64 },
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Error { media: Option<MediaItem>, error: String },
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}
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<span class="boring">}</span></code></pre></pre>
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<p><strong>TypeScript:</strong></p>
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<pre><code class="language-typescript">type PlayerState =
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| { kind: "idle" }
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| { kind: "loading"; media: MediaItem }
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| { kind: "playing"; media: MediaItem; position: number; duration: number }
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| { kind: "paused"; media: MediaItem; position: number; duration: number }
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| { kind: "seeking"; media: MediaItem; target: number }
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| { kind: "error"; media: MediaItem | null; error: string };
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</code></pre>
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<h2 id="mediaitem-serialization"><a class="header" href="#mediaitem-serialization">MediaItem Serialization</a></h2>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>// Rust (serde serialization)
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#[derive(Serialize, Deserialize)]
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pub struct MediaItem {
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pub id: String,
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pub title: String,
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#[serde(skip_serializing_if = "Option::is_none")]
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pub artist: Option<String>,
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// ...
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}
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<span class="boring">}</span></code></pre></pre>
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<pre><code class="language-typescript">// TypeScript
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interface MediaItem {
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id: string;
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title: string;
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artist?: string;
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// ...
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}
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</code></pre>
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<h2 id="tauri-v2-ipc-parameter-naming-convention"><a class="header" href="#tauri-v2-ipc-parameter-naming-convention">Tauri v2 IPC Parameter Naming Convention</a></h2>
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<p><strong>CRITICAL</strong>: Tauri v2's <code>#[tauri::command]</code> macro automatically converts snake_case Rust parameter names to camelCase for the frontend. All <code>invoke()</code> calls must use camelCase for top-level parameters.</p>
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<p><strong>Rule</strong>: Rust <code>fn cmd(repository_handle: String)</code> -> Frontend sends <code>{ repositoryHandle: "..." }</code></p>
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<pre><code class="language-typescript">// CORRECT - Tauri v2 auto-converts snake_case -> camelCase
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await invoke("player_play_tracks", {
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repositoryHandle: "handle-123", // Rust: repository_handle
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request: { trackIds: ["id1"], startIndex: 0 }
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});
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await invoke("remote_send_command", {
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sessionId: "session-123", // Rust: session_id
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command: "PlayPause"
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});
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await invoke("pin_item", {
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itemId: "item-123" // Rust: item_id
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});
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// WRONG - snake_case causes "invalid args request" error on Android
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await invoke("player_play_tracks", {
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repository_handle: "handle-123", // Will fail!
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});
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</code></pre>
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<p><strong>Parameter Name Mapping (Rust -> Frontend)</strong>:</p>
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<div class="table-wrapper"><table><thead><tr><th>Rust Parameter</th><th>Frontend Parameter</th><th>Used By</th></tr></thead><tbody>
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<tr><td><code>repository_handle</code></td><td><code>repositoryHandle</code></td><td><code>player_play_tracks</code>, <code>player_add_track_by_id</code>, <code>player_play_album_track</code></td></tr>
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<tr><td><code>session_id</code></td><td><code>sessionId</code></td><td><code>remote_send_command</code>, <code>remote_play_on_session</code>, <code>remote_session_seek</code></td></tr>
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<tr><td><code>item_id</code></td><td><code>itemId</code></td><td><code>pin_item</code>, <code>unpin_item</code></td></tr>
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<tr><td><code>current_item_id</code></td><td><code>currentItemId</code></td><td><code>playback_mode_transfer_to_local</code></td></tr>
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<tr><td><code>position_ticks</code></td><td><code>positionTicks</code></td><td><code>playback_mode_transfer_to_local</code>, <code>remote_session_seek</code></td></tr>
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<tr><td><code>item_ids</code></td><td><code>itemIds</code></td><td><code>remote_play_on_session</code></td></tr>
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<tr><td><code>start_index</code></td><td><code>startIndex</code></td><td><code>remote_play_on_session</code></td></tr>
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</tbody></table>
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</div>
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<p><strong>Nested struct fields</strong> use <code>#[serde(rename_all = "camelCase")]</code> separately - this is serde deserialization, not the command macro. Both layers convert independently.</p>
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<p><strong>Test Coverage</strong>: Integration tests in <code>src/lib/utils/tauriIntegration.test.ts</code> validate all invoke calls use correct camelCase parameter names.</p>
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<h2 id="rust-backend-thread-safety"><a class="header" href="#rust-backend-thread-safety">Rust Backend Thread Safety</a></h2>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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|
</span>// Shared state wrapped in Arc<Mutex<>>
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pub struct PlayerController {
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|
backend: Arc<Mutex<Box<dyn PlayerBackend>>>,
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queue: Arc<Mutex<QueueManager>>,
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// ...
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}
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// Tauri state wrapper
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pub struct PlayerStateWrapper(pub Mutex<PlayerController>);
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// Command handler pattern
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#[tauri::command]
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pub fn player_play(state: State<PlayerStateWrapper>) -> Result<PlayerStatus, String> {
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let mut controller = state.0.lock().unwrap(); // Acquire lock
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controller.play()?; // Operate
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Ok(get_player_status(&controller)) // Lock released
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}
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<span class="boring">}</span></code></pre></pre>
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<h2 id="frontend-stores"><a class="header" href="#frontend-stores">Frontend Stores</a></h2>
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<p>Svelte stores are inherently reactive and thread-safe for UI updates:</p>
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<pre><code class="language-typescript">const { subscribe, update } = writable<PlayerStore>(initialState);
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// Atomic updates
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function setPlaying(media: MediaItem, position: number, duration: number) {
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update(state => ({
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|
...state,
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|
state: { kind: "playing", media, position, duration }
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|
}));
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|
}
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|
</code></pre>
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