| 1 | //! Tauri command `chat_set_model`: switches the active on-device model. |
| 2 | //! |
| 3 | //! Updates the selected model, unloads any currently loaded model, and loads |
| 4 | //! the new one. Like `chat_send_message`, this returns `Ok(())` as soon as the |
| 5 | //! work is dispatched: switching can trigger a multi-gigabyte HuggingFace |
| 6 | //! download, so progress and completion are reported via the |
| 7 | //! `chat_status_changed` event (Loading → Ready, or Error) rather than a |
| 8 | //! blocking return that the WebView could GC out from under us. |
| 9 | |
| 10 | #[cfg(any( |
| 11 | target_os = "macos", |
| 12 | target_os = "ios", |
| 13 | target_os = "android", |
| 14 | target_os = "windows" |
| 15 | ))] |
| 16 | use { |
| 17 | super::{ |
| 18 | fmt_duration, resolve_model_id, resolved_model_config, sampling_config, CHAT_SYSTEM_PROMPT, |
| 19 | SELECTED_MODEL, |
| 20 | }, |
| 21 | ed_agent_tauri::EdState, |
| 22 | log::{error, info}, |
| 23 | tauri::State, |
| 24 | }; |
| 25 | |
| 26 | /// Switch Siti to the model identified by `model_id` (a HuggingFace repo id |
| 27 | /// from `chat_list_models`). The new model is loaded asynchronously; watch the |
| 28 | /// `chat_status_changed` event for `Loading` → `Ready`/`Error`. |
| 29 | #[cfg(any( |
| 30 | target_os = "macos", |
| 31 | target_os = "ios", |
| 32 | target_os = "android", |
| 33 | target_os = "windows" |
| 34 | ))] |
| 35 | #[tauri::command] |
| 36 | pub async fn chat_set_model(state: State<'_, EdState>, model_id: String) -> Result<(), String> { |
| 37 | // ── 1. Validate & resolve the requested model ──────────────────────── |
| 38 | let display_name = resolve_model_id(&model_id) |
| 39 | .ok_or_else(|| format!("Unknown or unsupported model id: {model_id}"))? |
| 40 | .display_name(); |
| 41 | |
| 42 | // ── 2. Persist the selection so resolved_model_config()/sampling_config() agree ─ |
| 43 | // NB: never hold the std Mutex guard across an `.await` (it would make this |
| 44 | // command future `!Send`), so resolve the loaded-state first. |
| 45 | let already_loaded = state.ed().is_loaded().await; |
| 46 | { |
| 47 | let mut selected = SELECTED_MODEL |
| 48 | .lock() |
| 49 | .map_err(|e| format!("Failed to update selected model: {e}"))?; |
| 50 | if *selected == model_id && already_loaded { |
| 51 | info!("Model {display_name} is already selected and loaded; nothing to do."); |
| 52 | return Ok(()); |
| 53 | } |
| 54 | *selected = model_id.clone(); |
| 55 | } |
| 56 | |
| 57 | info!("chat_set_model: switching to {display_name} ({model_id})"); |
| 58 | |
| 59 | // ── 3. Swap models off-thread; report progress via events ──────────── |
| 60 | // Re-resolve from the (now-persisted) selection inside the task so the |
| 61 | // GGUF/ISQ dispatch matches exactly what `chat_send_message` would load. |
| 62 | let ed = state.shared(); |
| 63 | tokio::task::spawn(async move { |
| 64 | if ed.is_loaded().await { |
| 65 | // The engine's own unload: Ed's `unload` would report `Unloaded` |
| 66 | // and flash the UI before the load below reports `Loading`. |
| 67 | ed.engine().unload_model().await; |
| 68 | } |
| 69 | |
| 70 | // Ed reports `Loading`, then `Ready` or `Error`. |
| 71 | match resolved_model_config() |
| 72 | .load( |
| 73 | &ed, |
| 74 | Some(CHAT_SYSTEM_PROMPT.to_string()), |
| 75 | Some(sampling_config()), |
| 76 | ) |
| 77 | .await |
| 78 | { |
| 79 | Ok(elapsed) => info!("Model {display_name} loaded in {}", fmt_duration(elapsed)), |
| 80 | Err(e) => error!("Failed to load model {display_name}: {e}"), |
| 81 | } |
| 82 | }); |
| 83 | |
| 84 | Ok(()) |
| 85 | } |
| 86 | |
| 87 | #[cfg(not(any( |
| 88 | target_os = "macos", |
| 89 | target_os = "ios", |
| 90 | target_os = "android", |
| 91 | target_os = "windows" |
| 92 | )))] |
| 93 | #[tauri::command] |
| 94 | pub async fn chat_set_model(_model_id: String) -> Result<(), String> { |
| 95 | log::debug!("Model switching is not supported on this platform."); |
| 96 | Err("Model switching is not supported on this platform.".to_string()) |
| 97 | } |