1use std::sync::Arc;
2
3use anyhow::Result;
4use assistant_tool::ToolWorkingSet;
5use collections::HashMap;
6use futures::future::Shared;
7use futures::{FutureExt as _, StreamExt as _};
8use gpui::{AppContext, EventEmitter, ModelContext, SharedString, Task};
9use language_model::{
10 LanguageModel, LanguageModelCompletionEvent, LanguageModelRequest, LanguageModelRequestMessage,
11 LanguageModelToolResult, LanguageModelToolUse, LanguageModelToolUseId, MessageContent, Role,
12 StopReason,
13};
14use language_models::provider::cloud::{MaxMonthlySpendReachedError, PaymentRequiredError};
15use serde::{Deserialize, Serialize};
16use util::post_inc;
17
18#[derive(Debug, Clone, Copy)]
19pub enum RequestKind {
20 Chat,
21}
22
23#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Serialize, Deserialize)]
24pub struct MessageId(usize);
25
26impl MessageId {
27 fn post_inc(&mut self) -> Self {
28 Self(post_inc(&mut self.0))
29 }
30}
31
32/// A message in a [`Thread`].
33#[derive(Debug, Clone)]
34pub struct Message {
35 pub id: MessageId,
36 pub role: Role,
37 pub text: String,
38}
39
40/// A thread of conversation with the LLM.
41pub struct Thread {
42 messages: Vec<Message>,
43 next_message_id: MessageId,
44 completion_count: usize,
45 pending_completions: Vec<PendingCompletion>,
46 tools: Arc<ToolWorkingSet>,
47 tool_uses_by_message: HashMap<MessageId, Vec<LanguageModelToolUse>>,
48 tool_results_by_message: HashMap<MessageId, Vec<LanguageModelToolResult>>,
49 pending_tool_uses_by_id: HashMap<LanguageModelToolUseId, PendingToolUse>,
50}
51
52impl Thread {
53 pub fn new(tools: Arc<ToolWorkingSet>, _cx: &mut ModelContext<Self>) -> Self {
54 Self {
55 messages: Vec::new(),
56 next_message_id: MessageId(0),
57 completion_count: 0,
58 pending_completions: Vec::new(),
59 tools,
60 tool_uses_by_message: HashMap::default(),
61 tool_results_by_message: HashMap::default(),
62 pending_tool_uses_by_id: HashMap::default(),
63 }
64 }
65
66 pub fn message(&self, id: MessageId) -> Option<&Message> {
67 self.messages.iter().find(|message| message.id == id)
68 }
69
70 pub fn tools(&self) -> &Arc<ToolWorkingSet> {
71 &self.tools
72 }
73
74 pub fn pending_tool_uses(&self) -> Vec<&PendingToolUse> {
75 self.pending_tool_uses_by_id.values().collect()
76 }
77
78 pub fn insert_user_message(&mut self, text: impl Into<String>, cx: &mut ModelContext<Self>) {
79 let id = self.next_message_id.post_inc();
80 self.messages.push(Message {
81 id,
82 role: Role::User,
83 text: text.into(),
84 });
85 cx.emit(ThreadEvent::MessageAdded(id));
86 }
87
88 pub fn to_completion_request(
89 &self,
90 _request_kind: RequestKind,
91 _cx: &AppContext,
92 ) -> LanguageModelRequest {
93 let mut request = LanguageModelRequest {
94 messages: vec![],
95 tools: Vec::new(),
96 stop: Vec::new(),
97 temperature: None,
98 };
99
100 for message in &self.messages {
101 let mut request_message = LanguageModelRequestMessage {
102 role: message.role,
103 content: Vec::new(),
104 cache: false,
105 };
106
107 if let Some(tool_results) = self.tool_results_by_message.get(&message.id) {
108 for tool_result in tool_results {
109 request_message
110 .content
111 .push(MessageContent::ToolResult(tool_result.clone()));
112 }
113 }
114
115 if !message.text.is_empty() {
116 request_message
117 .content
118 .push(MessageContent::Text(message.text.clone()));
119 }
120
121 if let Some(tool_uses) = self.tool_uses_by_message.get(&message.id) {
122 for tool_use in tool_uses {
123 request_message
124 .content
125 .push(MessageContent::ToolUse(tool_use.clone()));
126 }
127 }
128
129 request.messages.push(request_message);
130 }
131
132 request
133 }
134
135 pub fn stream_completion(
136 &mut self,
137 request: LanguageModelRequest,
138 model: Arc<dyn LanguageModel>,
139 cx: &mut ModelContext<Self>,
140 ) {
141 let pending_completion_id = post_inc(&mut self.completion_count);
142
143 let task = cx.spawn(|thread, mut cx| async move {
144 let stream = model.stream_completion(request, &cx);
145 let stream_completion = async {
146 let mut events = stream.await?;
147 let mut stop_reason = StopReason::EndTurn;
148
149 while let Some(event) = events.next().await {
150 let event = event?;
151
152 thread.update(&mut cx, |thread, cx| {
153 match event {
154 LanguageModelCompletionEvent::StartMessage { .. } => {
155 let id = thread.next_message_id.post_inc();
156 thread.messages.push(Message {
157 id,
158 role: Role::Assistant,
159 text: String::new(),
160 });
161 cx.emit(ThreadEvent::MessageAdded(id));
162 }
163 LanguageModelCompletionEvent::Stop(reason) => {
164 stop_reason = reason;
165 }
166 LanguageModelCompletionEvent::Text(chunk) => {
167 if let Some(last_message) = thread.messages.last_mut() {
168 if last_message.role == Role::Assistant {
169 last_message.text.push_str(&chunk);
170 }
171 }
172 }
173 LanguageModelCompletionEvent::ToolUse(tool_use) => {
174 if let Some(last_assistant_message) = thread
175 .messages
176 .iter()
177 .rfind(|message| message.role == Role::Assistant)
178 {
179 thread
180 .tool_uses_by_message
181 .entry(last_assistant_message.id)
182 .or_default()
183 .push(tool_use.clone());
184
185 thread.pending_tool_uses_by_id.insert(
186 tool_use.id.clone(),
187 PendingToolUse {
188 assistant_message_id: last_assistant_message.id,
189 id: tool_use.id,
190 name: tool_use.name,
191 input: tool_use.input,
192 status: PendingToolUseStatus::Idle,
193 },
194 );
195 }
196 }
197 }
198
199 cx.emit(ThreadEvent::StreamedCompletion);
200 cx.notify();
201 })?;
202
203 smol::future::yield_now().await;
204 }
205
206 thread.update(&mut cx, |thread, _cx| {
207 thread
208 .pending_completions
209 .retain(|completion| completion.id != pending_completion_id);
210 })?;
211
212 anyhow::Ok(stop_reason)
213 };
214
215 let result = stream_completion.await;
216
217 thread
218 .update(&mut cx, |_thread, cx| match result.as_ref() {
219 Ok(stop_reason) => match stop_reason {
220 StopReason::ToolUse => {
221 cx.emit(ThreadEvent::UsePendingTools);
222 }
223 StopReason::EndTurn => {}
224 StopReason::MaxTokens => {}
225 },
226 Err(error) => {
227 if error.is::<PaymentRequiredError>() {
228 cx.emit(ThreadEvent::ShowError(ThreadError::PaymentRequired));
229 } else if error.is::<MaxMonthlySpendReachedError>() {
230 cx.emit(ThreadEvent::ShowError(ThreadError::MaxMonthlySpendReached));
231 } else {
232 let error_message = error
233 .chain()
234 .map(|err| err.to_string())
235 .collect::<Vec<_>>()
236 .join("\n");
237 cx.emit(ThreadEvent::ShowError(ThreadError::Message(
238 SharedString::from(error_message.clone()),
239 )));
240 }
241 }
242 })
243 .ok();
244 });
245
246 self.pending_completions.push(PendingCompletion {
247 id: pending_completion_id,
248 _task: task,
249 });
250 }
251
252 pub fn insert_tool_output(
253 &mut self,
254 assistant_message_id: MessageId,
255 tool_use_id: LanguageModelToolUseId,
256 output: Task<Result<String>>,
257 cx: &mut ModelContext<Self>,
258 ) {
259 let insert_output_task = cx.spawn(|thread, mut cx| {
260 let tool_use_id = tool_use_id.clone();
261 async move {
262 let output = output.await;
263 thread
264 .update(&mut cx, |thread, cx| {
265 // The tool use was requested by an Assistant message,
266 // so we want to attach the tool results to the next
267 // user message.
268 let next_user_message = MessageId(assistant_message_id.0 + 1);
269
270 let tool_results = thread
271 .tool_results_by_message
272 .entry(next_user_message)
273 .or_default();
274
275 match output {
276 Ok(output) => {
277 tool_results.push(LanguageModelToolResult {
278 tool_use_id: tool_use_id.to_string(),
279 content: output,
280 is_error: false,
281 });
282
283 cx.emit(ThreadEvent::ToolFinished { tool_use_id });
284 }
285 Err(err) => {
286 tool_results.push(LanguageModelToolResult {
287 tool_use_id: tool_use_id.to_string(),
288 content: err.to_string(),
289 is_error: true,
290 });
291
292 if let Some(tool_use) =
293 thread.pending_tool_uses_by_id.get_mut(&tool_use_id)
294 {
295 tool_use.status = PendingToolUseStatus::Error(err.to_string());
296 }
297 }
298 }
299 })
300 .ok();
301 }
302 });
303
304 if let Some(tool_use) = self.pending_tool_uses_by_id.get_mut(&tool_use_id) {
305 tool_use.status = PendingToolUseStatus::Running {
306 _task: insert_output_task.shared(),
307 };
308 }
309 }
310}
311
312#[derive(Debug, Clone)]
313pub enum ThreadError {
314 PaymentRequired,
315 MaxMonthlySpendReached,
316 Message(SharedString),
317}
318
319#[derive(Debug, Clone)]
320pub enum ThreadEvent {
321 ShowError(ThreadError),
322 StreamedCompletion,
323 MessageAdded(MessageId),
324 UsePendingTools,
325 ToolFinished {
326 #[allow(unused)]
327 tool_use_id: LanguageModelToolUseId,
328 },
329}
330
331impl EventEmitter<ThreadEvent> for Thread {}
332
333struct PendingCompletion {
334 id: usize,
335 _task: Task<()>,
336}
337
338#[derive(Debug, Clone)]
339pub struct PendingToolUse {
340 pub id: LanguageModelToolUseId,
341 /// The ID of the Assistant message in which the tool use was requested.
342 pub assistant_message_id: MessageId,
343 pub name: String,
344 pub input: serde_json::Value,
345 pub status: PendingToolUseStatus,
346}
347
348#[derive(Debug, Clone)]
349pub enum PendingToolUseStatus {
350 Idle,
351 Running { _task: Shared<Task<()>> },
352 Error(#[allow(unused)] String),
353}
354
355impl PendingToolUseStatus {
356 pub fn is_idle(&self) -> bool {
357 matches!(self, PendingToolUseStatus::Idle)
358 }
359}