1use std::sync::Arc;
2
3use anyhow::Result;
4use assistant_tool::ToolWorkingSet;
5use chrono::{DateTime, Utc};
6use collections::HashMap;
7use futures::future::Shared;
8use futures::{FutureExt as _, StreamExt as _};
9use gpui::{AppContext, EventEmitter, ModelContext, SharedString, Task};
10use language_model::{
11 LanguageModel, LanguageModelCompletionEvent, LanguageModelRegistry, LanguageModelRequest,
12 LanguageModelRequestMessage, LanguageModelToolResult, LanguageModelToolUse,
13 LanguageModelToolUseId, MessageContent, Role, StopReason,
14};
15use language_models::provider::cloud::{MaxMonthlySpendReachedError, PaymentRequiredError};
16use serde::{Deserialize, Serialize};
17use util::{post_inc, TryFutureExt as _};
18use uuid::Uuid;
19
20use crate::context::{Context, ContextKind};
21
22#[derive(Debug, Clone, Copy)]
23pub enum RequestKind {
24 Chat,
25}
26
27#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Serialize, Deserialize)]
28pub struct ThreadId(Arc<str>);
29
30impl ThreadId {
31 pub fn new() -> Self {
32 Self(Uuid::new_v4().to_string().into())
33 }
34}
35
36impl std::fmt::Display for ThreadId {
37 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
38 write!(f, "{}", self.0)
39 }
40}
41
42#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Serialize, Deserialize)]
43pub struct MessageId(usize);
44
45impl MessageId {
46 fn post_inc(&mut self) -> Self {
47 Self(post_inc(&mut self.0))
48 }
49}
50
51/// A message in a [`Thread`].
52#[derive(Debug, Clone)]
53pub struct Message {
54 pub id: MessageId,
55 pub role: Role,
56 pub text: String,
57}
58
59/// A thread of conversation with the LLM.
60pub struct Thread {
61 id: ThreadId,
62 updated_at: DateTime<Utc>,
63 summary: Option<SharedString>,
64 pending_summary: Task<Option<()>>,
65 messages: Vec<Message>,
66 next_message_id: MessageId,
67 context_by_message: HashMap<MessageId, Vec<Context>>,
68 completion_count: usize,
69 pending_completions: Vec<PendingCompletion>,
70 tools: Arc<ToolWorkingSet>,
71 tool_uses_by_message: HashMap<MessageId, Vec<LanguageModelToolUse>>,
72 tool_results_by_message: HashMap<MessageId, Vec<LanguageModelToolResult>>,
73 pending_tool_uses_by_id: HashMap<LanguageModelToolUseId, PendingToolUse>,
74}
75
76impl Thread {
77 pub fn new(tools: Arc<ToolWorkingSet>, _cx: &mut ModelContext<Self>) -> Self {
78 Self {
79 id: ThreadId::new(),
80 updated_at: Utc::now(),
81 summary: None,
82 pending_summary: Task::ready(None),
83 messages: Vec::new(),
84 next_message_id: MessageId(0),
85 context_by_message: HashMap::default(),
86 completion_count: 0,
87 pending_completions: Vec::new(),
88 tools,
89 tool_uses_by_message: HashMap::default(),
90 tool_results_by_message: HashMap::default(),
91 pending_tool_uses_by_id: HashMap::default(),
92 }
93 }
94
95 pub fn id(&self) -> &ThreadId {
96 &self.id
97 }
98
99 pub fn is_empty(&self) -> bool {
100 self.messages.is_empty()
101 }
102
103 pub fn updated_at(&self) -> DateTime<Utc> {
104 self.updated_at
105 }
106
107 pub fn touch_updated_at(&mut self) {
108 self.updated_at = Utc::now();
109 }
110
111 pub fn summary(&self) -> Option<SharedString> {
112 self.summary.clone()
113 }
114
115 pub fn set_summary(&mut self, summary: impl Into<SharedString>, cx: &mut ModelContext<Self>) {
116 self.summary = Some(summary.into());
117 cx.emit(ThreadEvent::SummaryChanged);
118 }
119
120 pub fn message(&self, id: MessageId) -> Option<&Message> {
121 self.messages.iter().find(|message| message.id == id)
122 }
123
124 pub fn messages(&self) -> impl Iterator<Item = &Message> {
125 self.messages.iter()
126 }
127
128 pub fn tools(&self) -> &Arc<ToolWorkingSet> {
129 &self.tools
130 }
131
132 pub fn context_for_message(&self, id: MessageId) -> Option<&Vec<Context>> {
133 self.context_by_message.get(&id)
134 }
135
136 pub fn pending_tool_uses(&self) -> Vec<&PendingToolUse> {
137 self.pending_tool_uses_by_id.values().collect()
138 }
139
140 pub fn insert_user_message(
141 &mut self,
142 text: impl Into<String>,
143 context: Vec<Context>,
144 cx: &mut ModelContext<Self>,
145 ) {
146 let message_id = self.insert_message(Role::User, text, cx);
147 self.context_by_message.insert(message_id, context);
148 }
149
150 pub fn insert_message(
151 &mut self,
152 role: Role,
153 text: impl Into<String>,
154 cx: &mut ModelContext<Self>,
155 ) -> MessageId {
156 let id = self.next_message_id.post_inc();
157 self.messages.push(Message {
158 id,
159 role,
160 text: text.into(),
161 });
162 self.touch_updated_at();
163 cx.emit(ThreadEvent::MessageAdded(id));
164 id
165 }
166
167 pub fn to_completion_request(
168 &self,
169 _request_kind: RequestKind,
170 _cx: &AppContext,
171 ) -> LanguageModelRequest {
172 let mut request = LanguageModelRequest {
173 messages: vec![],
174 tools: Vec::new(),
175 stop: Vec::new(),
176 temperature: None,
177 };
178
179 for message in &self.messages {
180 let mut request_message = LanguageModelRequestMessage {
181 role: message.role,
182 content: Vec::new(),
183 cache: false,
184 };
185
186 if let Some(tool_results) = self.tool_results_by_message.get(&message.id) {
187 for tool_result in tool_results {
188 request_message
189 .content
190 .push(MessageContent::ToolResult(tool_result.clone()));
191 }
192 }
193
194 if let Some(context) = self.context_for_message(message.id) {
195 let mut file_context = String::new();
196 let mut fetch_context = String::new();
197
198 for context in context.iter() {
199 match context.kind {
200 ContextKind::File => {
201 file_context.push_str(&context.text);
202 file_context.push('\n');
203 }
204 ContextKind::FetchedUrl => {
205 fetch_context.push_str(&context.name);
206 fetch_context.push('\n');
207 fetch_context.push_str(&context.text);
208 fetch_context.push('\n');
209 }
210 }
211 }
212
213 let mut context_text = String::new();
214 if !file_context.is_empty() {
215 context_text.push_str("The following files are available:\n");
216 context_text.push_str(&file_context);
217 }
218
219 if !fetch_context.is_empty() {
220 context_text.push_str("The following fetched results are available\n");
221 context_text.push_str(&fetch_context);
222 }
223
224 request_message
225 .content
226 .push(MessageContent::Text(context_text))
227 }
228
229 if !message.text.is_empty() {
230 request_message
231 .content
232 .push(MessageContent::Text(message.text.clone()));
233 }
234
235 if let Some(tool_uses) = self.tool_uses_by_message.get(&message.id) {
236 for tool_use in tool_uses {
237 request_message
238 .content
239 .push(MessageContent::ToolUse(tool_use.clone()));
240 }
241 }
242
243 request.messages.push(request_message);
244 }
245
246 request
247 }
248
249 pub fn stream_completion(
250 &mut self,
251 request: LanguageModelRequest,
252 model: Arc<dyn LanguageModel>,
253 cx: &mut ModelContext<Self>,
254 ) {
255 let pending_completion_id = post_inc(&mut self.completion_count);
256
257 let task = cx.spawn(|thread, mut cx| async move {
258 let stream = model.stream_completion(request, &cx);
259 let stream_completion = async {
260 let mut events = stream.await?;
261 let mut stop_reason = StopReason::EndTurn;
262
263 while let Some(event) = events.next().await {
264 let event = event?;
265
266 thread.update(&mut cx, |thread, cx| {
267 match event {
268 LanguageModelCompletionEvent::StartMessage { .. } => {
269 thread.insert_message(Role::Assistant, String::new(), cx);
270 }
271 LanguageModelCompletionEvent::Stop(reason) => {
272 stop_reason = reason;
273 }
274 LanguageModelCompletionEvent::Text(chunk) => {
275 if let Some(last_message) = thread.messages.last_mut() {
276 if last_message.role == Role::Assistant {
277 last_message.text.push_str(&chunk);
278 cx.emit(ThreadEvent::StreamedAssistantText(
279 last_message.id,
280 chunk,
281 ));
282 }
283 }
284 }
285 LanguageModelCompletionEvent::ToolUse(tool_use) => {
286 if let Some(last_assistant_message) = thread
287 .messages
288 .iter()
289 .rfind(|message| message.role == Role::Assistant)
290 {
291 thread
292 .tool_uses_by_message
293 .entry(last_assistant_message.id)
294 .or_default()
295 .push(tool_use.clone());
296
297 thread.pending_tool_uses_by_id.insert(
298 tool_use.id.clone(),
299 PendingToolUse {
300 assistant_message_id: last_assistant_message.id,
301 id: tool_use.id,
302 name: tool_use.name,
303 input: tool_use.input,
304 status: PendingToolUseStatus::Idle,
305 },
306 );
307 }
308 }
309 }
310
311 thread.touch_updated_at();
312 cx.emit(ThreadEvent::StreamedCompletion);
313 cx.notify();
314 })?;
315
316 smol::future::yield_now().await;
317 }
318
319 thread.update(&mut cx, |thread, cx| {
320 thread
321 .pending_completions
322 .retain(|completion| completion.id != pending_completion_id);
323
324 if thread.summary.is_none() && thread.messages.len() >= 2 {
325 thread.summarize(cx);
326 }
327 })?;
328
329 anyhow::Ok(stop_reason)
330 };
331
332 let result = stream_completion.await;
333
334 thread
335 .update(&mut cx, |_thread, cx| match result.as_ref() {
336 Ok(stop_reason) => match stop_reason {
337 StopReason::ToolUse => {
338 cx.emit(ThreadEvent::UsePendingTools);
339 }
340 StopReason::EndTurn => {}
341 StopReason::MaxTokens => {}
342 },
343 Err(error) => {
344 if error.is::<PaymentRequiredError>() {
345 cx.emit(ThreadEvent::ShowError(ThreadError::PaymentRequired));
346 } else if error.is::<MaxMonthlySpendReachedError>() {
347 cx.emit(ThreadEvent::ShowError(ThreadError::MaxMonthlySpendReached));
348 } else {
349 let error_message = error
350 .chain()
351 .map(|err| err.to_string())
352 .collect::<Vec<_>>()
353 .join("\n");
354 cx.emit(ThreadEvent::ShowError(ThreadError::Message(
355 SharedString::from(error_message.clone()),
356 )));
357 }
358 }
359 })
360 .ok();
361 });
362
363 self.pending_completions.push(PendingCompletion {
364 id: pending_completion_id,
365 _task: task,
366 });
367 }
368
369 pub fn summarize(&mut self, cx: &mut ModelContext<Self>) {
370 let Some(provider) = LanguageModelRegistry::read_global(cx).active_provider() else {
371 return;
372 };
373 let Some(model) = LanguageModelRegistry::read_global(cx).active_model() else {
374 return;
375 };
376
377 if !provider.is_authenticated(cx) {
378 return;
379 }
380
381 let mut request = self.to_completion_request(RequestKind::Chat, cx);
382 request.messages.push(LanguageModelRequestMessage {
383 role: Role::User,
384 content: vec![
385 "Generate a concise 3-7 word title for this conversation, omitting punctuation. Go straight to the title, without any preamble and prefix like `Here's a concise suggestion:...` or `Title:`"
386 .into(),
387 ],
388 cache: false,
389 });
390
391 self.pending_summary = cx.spawn(|this, mut cx| {
392 async move {
393 let stream = model.stream_completion_text(request, &cx);
394 let mut messages = stream.await?;
395
396 let mut new_summary = String::new();
397 while let Some(message) = messages.stream.next().await {
398 let text = message?;
399 let mut lines = text.lines();
400 new_summary.extend(lines.next());
401
402 // Stop if the LLM generated multiple lines.
403 if lines.next().is_some() {
404 break;
405 }
406 }
407
408 this.update(&mut cx, |this, cx| {
409 if !new_summary.is_empty() {
410 this.summary = Some(new_summary.into());
411 }
412
413 cx.emit(ThreadEvent::SummaryChanged);
414 })?;
415
416 anyhow::Ok(())
417 }
418 .log_err()
419 });
420 }
421
422 pub fn insert_tool_output(
423 &mut self,
424 assistant_message_id: MessageId,
425 tool_use_id: LanguageModelToolUseId,
426 output: Task<Result<String>>,
427 cx: &mut ModelContext<Self>,
428 ) {
429 let insert_output_task = cx.spawn(|thread, mut cx| {
430 let tool_use_id = tool_use_id.clone();
431 async move {
432 let output = output.await;
433 thread
434 .update(&mut cx, |thread, cx| {
435 // The tool use was requested by an Assistant message,
436 // so we want to attach the tool results to the next
437 // user message.
438 let next_user_message = MessageId(assistant_message_id.0 + 1);
439
440 let tool_results = thread
441 .tool_results_by_message
442 .entry(next_user_message)
443 .or_default();
444
445 match output {
446 Ok(output) => {
447 tool_results.push(LanguageModelToolResult {
448 tool_use_id: tool_use_id.to_string(),
449 content: output,
450 is_error: false,
451 });
452
453 cx.emit(ThreadEvent::ToolFinished { tool_use_id });
454 }
455 Err(err) => {
456 tool_results.push(LanguageModelToolResult {
457 tool_use_id: tool_use_id.to_string(),
458 content: err.to_string(),
459 is_error: true,
460 });
461
462 if let Some(tool_use) =
463 thread.pending_tool_uses_by_id.get_mut(&tool_use_id)
464 {
465 tool_use.status = PendingToolUseStatus::Error(err.to_string());
466 }
467 }
468 }
469 })
470 .ok();
471 }
472 });
473
474 if let Some(tool_use) = self.pending_tool_uses_by_id.get_mut(&tool_use_id) {
475 tool_use.status = PendingToolUseStatus::Running {
476 _task: insert_output_task.shared(),
477 };
478 }
479 }
480}
481
482#[derive(Debug, Clone)]
483pub enum ThreadError {
484 PaymentRequired,
485 MaxMonthlySpendReached,
486 Message(SharedString),
487}
488
489#[derive(Debug, Clone)]
490pub enum ThreadEvent {
491 ShowError(ThreadError),
492 StreamedCompletion,
493 StreamedAssistantText(MessageId, String),
494 MessageAdded(MessageId),
495 SummaryChanged,
496 UsePendingTools,
497 ToolFinished {
498 #[allow(unused)]
499 tool_use_id: LanguageModelToolUseId,
500 },
501}
502
503impl EventEmitter<ThreadEvent> for Thread {}
504
505struct PendingCompletion {
506 id: usize,
507 _task: Task<()>,
508}
509
510#[derive(Debug, Clone)]
511pub struct PendingToolUse {
512 pub id: LanguageModelToolUseId,
513 /// The ID of the Assistant message in which the tool use was requested.
514 pub assistant_message_id: MessageId,
515 pub name: String,
516 pub input: serde_json::Value,
517 pub status: PendingToolUseStatus,
518}
519
520#[derive(Debug, Clone)]
521pub enum PendingToolUseStatus {
522 Idle,
523 Running { _task: Shared<Task<()>> },
524 Error(#[allow(unused)] String),
525}
526
527impl PendingToolUseStatus {
528 pub fn is_idle(&self) -> bool {
529 matches!(self, PendingToolUseStatus::Idle)
530 }
531}