| 1 | //! Several conversations over one Ed. |
| 2 | |
| 3 | use std::collections::HashMap; |
| 4 | use std::future::Future; |
| 5 | use std::sync::atomic::{AtomicU64, Ordering}; |
| 6 | use std::sync::Arc; |
| 7 | use std::time::Duration; |
| 8 | |
| 9 | use ed_agent::{ |
| 10 | AgentConfig, AgentError, AgentReply, ApprovalDecision, ChatMessage, Ed, RejectingExecutor, |
| 11 | SessionError, SessionMeta, SessionStore, ToolExecutor, |
| 12 | }; |
| 13 | use log::{error, info, warn}; |
| 14 | use tauri::{AppHandle, Emitter}; |
| 15 | use tokio::sync::Mutex; |
| 16 | |
| 17 | use crate::approvals::{TauriApprovals, DEFAULT_APPROVAL_TIMEOUT}; |
| 18 | use crate::events::{SubmitReplyPayload, EVENT_CHAT_REPLY}; |
| 19 | use crate::scope::TurnScope; |
| 20 | use crate::sink::TauriSink; |
| 21 | |
| 22 | #[derive(Default)] |
| 23 | struct State { |
| 24 | active: Option<String>, |
| 25 | /// Histories of sessions that were switched away from, so switching back |
| 26 | /// doesn't hit the store. |
| 27 | cache: HashMap<String, Vec<ChatMessage>>, |
| 28 | } |
| 29 | |
| 30 | struct Shared { |
| 31 | app: AppHandle, |
| 32 | ed: Arc<Ed<TauriSink>>, |
| 33 | store: Arc<dyn SessionStore>, |
| 34 | approvals: Arc<TauriApprovals>, |
| 35 | scope: TurnScope, |
| 36 | /// Bumped by [`EdSessions::reset`]. A turn captures it at dispatch and |
| 37 | /// refuses to save or emit if it changed by completion, so a reply that |
| 38 | /// finishes after logout or an account switch can't land in the next |
| 39 | /// account's storage. |
| 40 | generation: AtomicU64, |
| 41 | state: Mutex<State>, |
| 42 | error_message: Option<String>, |
| 43 | new_id: Box<dyn Fn() -> String + Send + Sync>, |
| 44 | } |
| 45 | |
| 46 | /// Multi-session chat state: one [`Ed`], many conversations. |
| 47 | /// |
| 48 | /// Register it with `app.manage(sessions)` and the `chat_*_session` commands. |
| 49 | /// It owns which session is live in the engine, an in-memory cache, the |
| 50 | /// generation fence, and approvals; persistence stays with the host's |
| 51 | /// [`SessionStore`]. |
| 52 | /// |
| 53 | /// Cheap to clone. |
| 54 | #[derive(Clone)] |
| 55 | pub struct EdSessions { |
| 56 | shared: Arc<Shared>, |
| 57 | } |
| 58 | |
| 59 | /// Configuration for [`EdSessions`]. |
| 60 | pub struct EdSessionsBuilder { |
| 61 | app: AppHandle, |
| 62 | store: Arc<dyn SessionStore>, |
| 63 | executor: Arc<dyn ToolExecutor>, |
| 64 | config: AgentConfig, |
| 65 | onde_app_id: Option<String>, |
| 66 | approval_timeout: Duration, |
| 67 | error_message: Option<String>, |
| 68 | new_id: Box<dyn Fn() -> String + Send + Sync>, |
| 69 | } |
| 70 | |
| 71 | impl EdSessionsBuilder { |
| 72 | /// Run tools through `executor`. Defaults to rejecting every tool. |
| 73 | pub fn executor(mut self, executor: Arc<dyn ToolExecutor>) -> Self { |
| 74 | self.executor = executor; |
| 75 | self |
| 76 | } |
| 77 | |
| 78 | pub fn config(mut self, config: AgentConfig) -> Self { |
| 79 | self.config = config; |
| 80 | self |
| 81 | } |
| 82 | |
| 83 | /// Associate telemetry with an Onde app id. |
| 84 | pub fn onde_app_id(mut self, id: impl Into<String>) -> Self { |
| 85 | self.onde_app_id = Some(id.into()); |
| 86 | self |
| 87 | } |
| 88 | |
| 89 | /// How long an approval waits for the user. Default 120 seconds. |
| 90 | pub fn approval_timeout(mut self, timeout: Duration) -> Self { |
| 91 | self.approval_timeout = timeout; |
| 92 | self |
| 93 | } |
| 94 | |
| 95 | /// Show this to the user instead of the error text when a turn fails. The |
| 96 | /// real error is still logged. |
| 97 | pub fn error_message(mut self, message: impl Into<String>) -> Self { |
| 98 | self.error_message = Some(message.into()); |
| 99 | self |
| 100 | } |
| 101 | |
| 102 | /// How [`EdSessions::new_session`] names a session. Defaults to a random UUID. A store that |
| 103 | /// treats some ids as ephemeral (by prefix, say) can mint matching ones here. |
| 104 | pub fn id_generator(mut self, generator: impl Fn() -> String + Send + Sync + 'static) -> Self { |
| 105 | self.new_id = Box::new(generator); |
| 106 | self |
| 107 | } |
| 108 | |
| 109 | pub fn build(self) -> EdSessions { |
| 110 | let scope = TurnScope::default(); |
| 111 | let approvals = Arc::new(TauriApprovals::scoped( |
| 112 | self.app.clone(), |
| 113 | scope.clone(), |
| 114 | self.approval_timeout, |
| 115 | )); |
| 116 | let sink = TauriSink::scoped(self.app.clone(), scope.clone(), false); |
| 117 | let ed = Ed::with_agent_and_app_id( |
| 118 | sink, |
| 119 | self.executor, |
| 120 | approvals.clone(), |
| 121 | self.config, |
| 122 | self.onde_app_id, |
| 123 | ); |
| 124 | EdSessions { |
| 125 | shared: Arc::new(Shared { |
| 126 | app: self.app, |
| 127 | ed: Arc::new(ed), |
| 128 | store: self.store, |
| 129 | approvals, |
| 130 | scope, |
| 131 | generation: AtomicU64::new(0), |
| 132 | state: Mutex::new(State::default()), |
| 133 | error_message: self.error_message, |
| 134 | new_id: self.new_id, |
| 135 | }), |
| 136 | } |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | impl EdSessions { |
| 141 | pub fn builder(app: AppHandle, store: impl SessionStore) -> EdSessionsBuilder { |
| 142 | EdSessionsBuilder { |
| 143 | app, |
| 144 | store: Arc::new(store), |
| 145 | executor: Arc::new(RejectingExecutor), |
| 146 | config: AgentConfig::default(), |
| 147 | onde_app_id: None, |
| 148 | approval_timeout: DEFAULT_APPROVAL_TIMEOUT, |
| 149 | error_message: None, |
| 150 | new_id: Box::new(|| uuid::Uuid::new_v4().to_string()), |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | /// The agent, for loading a model and anything else Ed exposes. |
| 155 | pub fn ed(&self) -> &Arc<Ed<TauriSink>> { |
| 156 | &self.shared.ed |
| 157 | } |
| 158 | |
| 159 | pub fn approvals(&self) -> &Arc<TauriApprovals> { |
| 160 | &self.shared.approvals |
| 161 | } |
| 162 | |
| 163 | /// The current generation. Capture it before slow work and compare with |
| 164 | /// [`is_current`](EdSessions::is_current) afterwards. |
| 165 | pub fn generation(&self) -> u64 { |
| 166 | self.shared.generation.load(Ordering::SeqCst) |
| 167 | } |
| 168 | |
| 169 | pub fn is_current(&self, generation: u64) -> bool { |
| 170 | self.generation() == generation |
| 171 | } |
| 172 | |
| 173 | /// The id of the session live in the engine, if any. |
| 174 | pub async fn active(&self) -> Option<String> { |
| 175 | self.shared.state.lock().await.active.clone() |
| 176 | } |
| 177 | |
| 178 | /// Stored sessions, most recently updated first. |
| 179 | pub async fn list(&self) -> Result<Vec<SessionMeta>, SessionError> { |
| 180 | self.shared.store.list().await |
| 181 | } |
| 182 | |
| 183 | /// Make `session` the live conversation. |
| 184 | /// |
| 185 | /// The outgoing session's history is kept in memory; the incoming one |
| 186 | /// comes from memory, then the store. An unknown id starts empty. |
| 187 | pub async fn activate(&self, session: &str) { |
| 188 | let shared = &self.shared; |
| 189 | let mut state = shared.state.lock().await; |
| 190 | if state.active.as_deref() == Some(session) { |
| 191 | return; |
| 192 | } |
| 193 | if let Some(previous) = state.active.take() { |
| 194 | let live = shared.ed.history().await; |
| 195 | state.cache.insert(previous, live); |
| 196 | } |
| 197 | let stored = match state.cache.remove(session) { |
| 198 | Some(messages) => messages, |
| 199 | None => match shared.store.load(session).await { |
| 200 | Ok(messages) => messages.unwrap_or_default(), |
| 201 | Err(err) => { |
| 202 | error!("ed-tauri: could not load session {session}: {err}"); |
| 203 | Vec::new() |
| 204 | } |
| 205 | }, |
| 206 | }; |
| 207 | shared.ed.restore_history(stored).await; |
| 208 | state.active = Some(session.to_owned()); |
| 209 | } |
| 210 | |
| 211 | /// Start an empty session and make it live. Returns its id. The store |
| 212 | /// hears about it when the first turn completes. |
| 213 | pub async fn new_session(&self) -> String { |
| 214 | let id = (self.shared.new_id)(); |
| 215 | self.activate(&id).await; |
| 216 | id |
| 217 | } |
| 218 | |
| 219 | /// The messages of `session`, activating it. |
| 220 | pub async fn history(&self, session: &str) -> Vec<ChatMessage> { |
| 221 | self.activate(session).await; |
| 222 | self.shared.ed.history().await |
| 223 | } |
| 224 | |
| 225 | /// The messages of `session` without switching to it: the live history if it is the active |
| 226 | /// session, else the cache, else the store. For rendering a session that is not on screen, |
| 227 | /// without disturbing a turn that is running in another. |
| 228 | pub async fn peek(&self, session: &str) -> Vec<ChatMessage> { |
| 229 | let shared = &self.shared; |
| 230 | let state = shared.state.lock().await; |
| 231 | if state.active.as_deref() == Some(session) { |
| 232 | return shared.ed.history().await; |
| 233 | } |
| 234 | if let Some(cached) = state.cache.get(session) { |
| 235 | return cached.clone(); |
| 236 | } |
| 237 | drop(state); |
| 238 | match shared.store.load(session).await { |
| 239 | Ok(messages) => messages.unwrap_or_default(), |
| 240 | Err(err) => { |
| 241 | error!("ed-tauri: could not load session {session}: {err}"); |
| 242 | Vec::new() |
| 243 | } |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | /// Delete a session from the store and memory. If it was live, the engine |
| 248 | /// is cleared and no session is live until the next activate. |
| 249 | pub async fn delete(&self, session: &str) -> Result<(), SessionError> { |
| 250 | let shared = &self.shared; |
| 251 | let result = shared.store.delete(session).await; |
| 252 | let mut state = shared.state.lock().await; |
| 253 | state.cache.remove(session); |
| 254 | if state.active.as_deref() == Some(session) { |
| 255 | state.active = None; |
| 256 | shared.ed.clear_history().await; |
| 257 | } |
| 258 | result |
| 259 | } |
| 260 | |
| 261 | /// Drop all in-memory state and fence off in-flight turns. For logout and |
| 262 | /// account switches: the next account must never see this one's chats. |
| 263 | /// Stored sessions are left alone. |
| 264 | pub async fn reset(&self) { |
| 265 | let shared = &self.shared; |
| 266 | shared.generation.fetch_add(1, Ordering::SeqCst); |
| 267 | shared.ed.cancel(); |
| 268 | shared.approvals.cancel_all().await; |
| 269 | let mut state = shared.state.lock().await; |
| 270 | state.cache.clear(); |
| 271 | state.active = None; |
| 272 | shared.ed.clear_history().await; |
| 273 | } |
| 274 | |
| 275 | /// Save the live history under `session`, unless `generation` is stale. |
| 276 | pub async fn save(&self, session: &str, generation: u64) { |
| 277 | let shared = &self.shared; |
| 278 | let live = shared.ed.history().await; |
| 279 | let mut state = shared.state.lock().await; |
| 280 | if !self.is_current(generation) { |
| 281 | return; |
| 282 | } |
| 283 | if let Err(err) = shared.store.save(session, &live).await { |
| 284 | error!("ed-tauri: could not save session {session}: {err}"); |
| 285 | } |
| 286 | state.cache.insert(session.to_owned(), live); |
| 287 | } |
| 288 | |
| 289 | /// Run one agent turn in `session` and deliver the result as a |
| 290 | /// `chat_reply` event. |
| 291 | /// |
| 292 | /// Returns as soon as the session is active and the turn is spawned. A |
| 293 | /// long-pending invoke can be dropped by a mobile webview, so the answer |
| 294 | /// travels by event: `{id, session, reply, duration, error}`. |
| 295 | pub async fn submit(&self, session: &str, id: &str, message: impl Into<String>) { |
| 296 | let message = message.into(); |
| 297 | self.submit_with(session, id, move |ed| async move { ed.run(message).await }) |
| 298 | .await; |
| 299 | } |
| 300 | |
| 301 | /// Like [`submit`](EdSessions::submit), with the turn supplied by the |
| 302 | /// host: rewrite the message, or recover and retry on a known engine |
| 303 | /// failure. The closure runs on the spawned task. |
| 304 | pub async fn submit_with<F, Fut>(&self, session: &str, id: &str, turn: F) |
| 305 | where |
| 306 | F: FnOnce(Arc<Ed<TauriSink>>) -> Fut + Send + 'static, |
| 307 | Fut: Future<Output = Result<AgentReply, AgentError>> + Send + 'static, |
| 308 | { |
| 309 | self.activate(session).await; |
| 310 | let generation = self.generation(); |
| 311 | let this = self.clone(); |
| 312 | let session = session.to_owned(); |
| 313 | let id = id.to_owned(); |
| 314 | info!("ed-tauri: dispatch session={session} id={id}"); |
| 315 | |
| 316 | tokio::spawn(async move { |
| 317 | this.shared.scope.set(&session, &id); |
| 318 | let result = turn(this.shared.ed.clone()).await; |
| 319 | this.shared.scope.clear(); |
| 320 | |
| 321 | if !this.is_current(generation) { |
| 322 | info!("ed-tauri: reply dropped, the account context changed (session={session})"); |
| 323 | return; |
| 324 | } |
| 325 | this.save(&session, generation).await; |
| 326 | if !this.is_current(generation) { |
| 327 | return; |
| 328 | } |
| 329 | |
| 330 | let payload = match result { |
| 331 | Ok(reply) => SubmitReplyPayload { |
| 332 | id, |
| 333 | session, |
| 334 | reply: Some(reply.text), |
| 335 | duration: Some(reply.duration), |
| 336 | error: None, |
| 337 | }, |
| 338 | Err(err) => { |
| 339 | error!("ed-tauri: turn failed: {err}"); |
| 340 | SubmitReplyPayload { |
| 341 | id, |
| 342 | session, |
| 343 | reply: None, |
| 344 | duration: None, |
| 345 | error: Some( |
| 346 | this.shared |
| 347 | .error_message |
| 348 | .clone() |
| 349 | .unwrap_or_else(|| err.to_string()), |
| 350 | ), |
| 351 | } |
| 352 | } |
| 353 | }; |
| 354 | if let Err(err) = this.shared.app.emit(EVENT_CHAT_REPLY, payload) { |
| 355 | warn!("ed-tauri: could not emit chat_reply: {err}"); |
| 356 | } |
| 357 | }); |
| 358 | } |
| 359 | |
| 360 | /// Answer a pending approval. |
| 361 | pub async fn respond_approval( |
| 362 | &self, |
| 363 | request_id: &str, |
| 364 | decision: ApprovalDecision, |
| 365 | ) -> Result<(), String> { |
| 366 | self.shared.approvals.respond(request_id, decision).await |
| 367 | } |
| 368 | } |