1use crate::AgentServerCommand;
2use acp_thread::AgentConnection;
3use acp_tools::AcpConnectionRegistry;
4use action_log::ActionLog;
5use agent_client_protocol::{self as acp, Agent as _, ErrorCode};
6use anyhow::anyhow;
7use collections::HashMap;
8use futures::AsyncBufReadExt as _;
9use futures::channel::oneshot;
10use futures::io::BufReader;
11use project::Project;
12use serde::Deserialize;
13use std::{any::Any, cell::RefCell};
14use std::{path::Path, rc::Rc};
15use thiserror::Error;
16
17use anyhow::{Context as _, Result};
18use gpui::{App, AppContext as _, AsyncApp, Entity, SharedString, Task, WeakEntity};
19
20use acp_thread::{AcpThread, AuthRequired, LoadError};
21
22#[derive(Debug, Error)]
23#[error("Unsupported version")]
24pub struct UnsupportedVersion;
25
26pub struct AcpConnection {
27 server_name: SharedString,
28 connection: Rc<acp::ClientSideConnection>,
29 sessions: Rc<RefCell<HashMap<acp::SessionId, AcpSession>>>,
30 auth_methods: Vec<acp::AuthMethod>,
31 prompt_capabilities: acp::PromptCapabilities,
32 _io_task: Task<Result<()>>,
33}
34
35pub struct AcpSession {
36 thread: WeakEntity<AcpThread>,
37 suppress_abort_err: bool,
38}
39
40pub async fn connect(
41 server_name: SharedString,
42 command: AgentServerCommand,
43 root_dir: &Path,
44 cx: &mut AsyncApp,
45) -> Result<Rc<dyn AgentConnection>> {
46 let conn = AcpConnection::stdio(server_name, command.clone(), root_dir, cx).await?;
47 Ok(Rc::new(conn) as _)
48}
49
50const MINIMUM_SUPPORTED_VERSION: acp::ProtocolVersion = acp::V1;
51
52impl AcpConnection {
53 pub async fn stdio(
54 server_name: SharedString,
55 command: AgentServerCommand,
56 root_dir: &Path,
57 cx: &mut AsyncApp,
58 ) -> Result<Self> {
59 let mut child = util::command::new_smol_command(&command.path)
60 .args(command.args.iter().map(|arg| arg.as_str()))
61 .envs(command.env.iter().flatten())
62 .current_dir(root_dir)
63 .stdin(std::process::Stdio::piped())
64 .stdout(std::process::Stdio::piped())
65 .stderr(std::process::Stdio::piped())
66 .kill_on_drop(true)
67 .spawn()?;
68
69 let stdout = child.stdout.take().context("Failed to take stdout")?;
70 let stdin = child.stdin.take().context("Failed to take stdin")?;
71 let stderr = child.stderr.take().context("Failed to take stderr")?;
72 log::trace!("Spawned (pid: {})", child.id());
73
74 let sessions = Rc::new(RefCell::new(HashMap::default()));
75
76 let client = ClientDelegate {
77 sessions: sessions.clone(),
78 cx: cx.clone(),
79 };
80 let (connection, io_task) = acp::ClientSideConnection::new(client, stdin, stdout, {
81 let foreground_executor = cx.foreground_executor().clone();
82 move |fut| {
83 foreground_executor.spawn(fut).detach();
84 }
85 });
86
87 let io_task = cx.background_spawn(io_task);
88
89 cx.background_spawn(async move {
90 let mut stderr = BufReader::new(stderr);
91 let mut line = String::new();
92 while let Ok(n) = stderr.read_line(&mut line).await
93 && n > 0
94 {
95 log::warn!("agent stderr: {}", &line);
96 line.clear();
97 }
98 })
99 .detach();
100
101 cx.spawn({
102 let sessions = sessions.clone();
103 async move |cx| {
104 let status = child.status().await?;
105
106 for session in sessions.borrow().values() {
107 session
108 .thread
109 .update(cx, |thread, cx| {
110 thread.emit_load_error(LoadError::Exited { status }, cx)
111 })
112 .ok();
113 }
114
115 anyhow::Ok(())
116 }
117 })
118 .detach();
119
120 let connection = Rc::new(connection);
121
122 cx.update(|cx| {
123 AcpConnectionRegistry::default_global(cx).update(cx, |registry, cx| {
124 registry.set_active_connection(server_name.clone(), &connection, cx)
125 });
126 })?;
127
128 let response = connection
129 .initialize(acp::InitializeRequest {
130 protocol_version: acp::VERSION,
131 client_capabilities: acp::ClientCapabilities {
132 fs: acp::FileSystemCapability {
133 read_text_file: true,
134 write_text_file: true,
135 },
136 },
137 })
138 .await?;
139
140 if response.protocol_version < MINIMUM_SUPPORTED_VERSION {
141 return Err(UnsupportedVersion.into());
142 }
143
144 Ok(Self {
145 auth_methods: response.auth_methods,
146 connection,
147 server_name,
148 sessions,
149 prompt_capabilities: response.agent_capabilities.prompt_capabilities,
150 _io_task: io_task,
151 })
152 }
153}
154
155impl AgentConnection for AcpConnection {
156 fn new_thread(
157 self: Rc<Self>,
158 project: Entity<Project>,
159 cwd: &Path,
160 cx: &mut App,
161 ) -> Task<Result<Entity<AcpThread>>> {
162 let conn = self.connection.clone();
163 let sessions = self.sessions.clone();
164 let cwd = cwd.to_path_buf();
165 cx.spawn(async move |cx| {
166 let response = conn
167 .new_session(acp::NewSessionRequest {
168 mcp_servers: vec![],
169 cwd,
170 })
171 .await
172 .map_err(|err| {
173 if err.code == acp::ErrorCode::AUTH_REQUIRED.code {
174 let mut error = AuthRequired::new();
175
176 if err.message != acp::ErrorCode::AUTH_REQUIRED.message {
177 error = error.with_description(err.message);
178 }
179
180 anyhow!(error)
181 } else {
182 anyhow!(err)
183 }
184 })?;
185
186 let session_id = response.session_id;
187 let action_log = cx.new(|_| ActionLog::new(project.clone()))?;
188 let thread = cx.new(|cx| {
189 AcpThread::new(
190 self.server_name.clone(),
191 self.clone(),
192 project,
193 action_log,
194 session_id.clone(),
195 // ACP doesn't currently support per-session prompt capabilities or changing capabilities dynamically.
196 watch::Receiver::constant(self.prompt_capabilities),
197 cx,
198 )
199 })?;
200
201 let session = AcpSession {
202 thread: thread.downgrade(),
203 suppress_abort_err: false,
204 };
205 sessions.borrow_mut().insert(session_id, session);
206
207 Ok(thread)
208 })
209 }
210
211 fn auth_methods(&self) -> &[acp::AuthMethod] {
212 &self.auth_methods
213 }
214
215 fn authenticate(&self, method_id: acp::AuthMethodId, cx: &mut App) -> Task<Result<()>> {
216 let conn = self.connection.clone();
217 cx.foreground_executor().spawn(async move {
218 let result = conn
219 .authenticate(acp::AuthenticateRequest {
220 method_id: method_id.clone(),
221 })
222 .await?;
223
224 Ok(result)
225 })
226 }
227
228 fn prompt(
229 &self,
230 _id: Option<acp_thread::UserMessageId>,
231 params: acp::PromptRequest,
232 cx: &mut App,
233 ) -> Task<Result<acp::PromptResponse>> {
234 let conn = self.connection.clone();
235 let sessions = self.sessions.clone();
236 let session_id = params.session_id.clone();
237 cx.foreground_executor().spawn(async move {
238 let result = conn.prompt(params).await;
239
240 let mut suppress_abort_err = false;
241
242 if let Some(session) = sessions.borrow_mut().get_mut(&session_id) {
243 suppress_abort_err = session.suppress_abort_err;
244 session.suppress_abort_err = false;
245 }
246
247 match result {
248 Ok(response) => Ok(response),
249 Err(err) => {
250 if err.code != ErrorCode::INTERNAL_ERROR.code {
251 anyhow::bail!(err)
252 }
253
254 let Some(data) = &err.data else {
255 anyhow::bail!(err)
256 };
257
258 // Temporary workaround until the following PR is generally available:
259 // https://github.com/google-gemini/gemini-cli/pull/6656
260
261 #[derive(Deserialize)]
262 #[serde(deny_unknown_fields)]
263 struct ErrorDetails {
264 details: Box<str>,
265 }
266
267 match serde_json::from_value(data.clone()) {
268 Ok(ErrorDetails { details }) => {
269 if suppress_abort_err
270 && (details.contains("This operation was aborted")
271 || details.contains("The user aborted a request"))
272 {
273 Ok(acp::PromptResponse {
274 stop_reason: acp::StopReason::Cancelled,
275 })
276 } else {
277 Err(anyhow!(details))
278 }
279 }
280 Err(_) => Err(anyhow!(err)),
281 }
282 }
283 }
284 })
285 }
286
287 fn cancel(&self, session_id: &acp::SessionId, cx: &mut App) {
288 if let Some(session) = self.sessions.borrow_mut().get_mut(session_id) {
289 session.suppress_abort_err = true;
290 }
291 let conn = self.connection.clone();
292 let params = acp::CancelNotification {
293 session_id: session_id.clone(),
294 };
295 cx.foreground_executor()
296 .spawn(async move { conn.cancel(params).await })
297 .detach();
298 }
299
300 fn into_any(self: Rc<Self>) -> Rc<dyn Any> {
301 self
302 }
303}
304
305struct ClientDelegate {
306 sessions: Rc<RefCell<HashMap<acp::SessionId, AcpSession>>>,
307 cx: AsyncApp,
308}
309
310impl acp::Client for ClientDelegate {
311 async fn request_permission(
312 &self,
313 arguments: acp::RequestPermissionRequest,
314 ) -> Result<acp::RequestPermissionResponse, acp::Error> {
315 let cx = &mut self.cx.clone();
316 let rx = self
317 .sessions
318 .borrow()
319 .get(&arguments.session_id)
320 .context("Failed to get session")?
321 .thread
322 .update(cx, |thread, cx| {
323 thread.request_tool_call_authorization(arguments.tool_call, arguments.options, cx)
324 })?;
325
326 let result = rx?.await;
327
328 let outcome = match result {
329 Ok(option) => acp::RequestPermissionOutcome::Selected { option_id: option },
330 Err(oneshot::Canceled) => acp::RequestPermissionOutcome::Cancelled,
331 };
332
333 Ok(acp::RequestPermissionResponse { outcome })
334 }
335
336 async fn write_text_file(
337 &self,
338 arguments: acp::WriteTextFileRequest,
339 ) -> Result<(), acp::Error> {
340 let cx = &mut self.cx.clone();
341 let task = self
342 .sessions
343 .borrow()
344 .get(&arguments.session_id)
345 .context("Failed to get session")?
346 .thread
347 .update(cx, |thread, cx| {
348 thread.write_text_file(arguments.path, arguments.content, cx)
349 })?;
350
351 task.await?;
352
353 Ok(())
354 }
355
356 async fn read_text_file(
357 &self,
358 arguments: acp::ReadTextFileRequest,
359 ) -> Result<acp::ReadTextFileResponse, acp::Error> {
360 let cx = &mut self.cx.clone();
361 let task = self
362 .sessions
363 .borrow()
364 .get(&arguments.session_id)
365 .context("Failed to get session")?
366 .thread
367 .update(cx, |thread, cx| {
368 thread.read_text_file(arguments.path, arguments.line, arguments.limit, false, cx)
369 })?;
370
371 let content = task.await?;
372
373 Ok(acp::ReadTextFileResponse { content })
374 }
375
376 async fn session_notification(
377 &self,
378 notification: acp::SessionNotification,
379 ) -> Result<(), acp::Error> {
380 let cx = &mut self.cx.clone();
381 let sessions = self.sessions.borrow();
382 let session = sessions
383 .get(¬ification.session_id)
384 .context("Failed to get session")?;
385
386 session.thread.update(cx, |thread, cx| {
387 thread.handle_session_update(notification.update, cx)
388 })??;
389
390 Ok(())
391 }
392}