Update to new agent schema (#35578)

Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <agus@zed.dev>

crates/agent_servers/src/acp/v1.rs

@@ -0,0 +1,254 @@
+use agent_client_protocol::{self as acp, Agent as _};
+use collections::HashMap;
+use futures::channel::oneshot;
+use project::Project;
+use std::cell::RefCell;
+use std::path::Path;
+use std::rc::Rc;
+
+use anyhow::{Context as _, Result};
+use gpui::{App, AppContext as _, AsyncApp, Entity, Task, WeakEntity};
+
+use crate::{AgentServerCommand, acp::UnsupportedVersion};
+use acp_thread::{AcpThread, AgentConnection, AuthRequired};
+
+pub struct AcpConnection {
+    server_name: &'static str,
+    connection: Rc<acp::ClientSideConnection>,
+    sessions: Rc<RefCell<HashMap<acp::SessionId, AcpSession>>>,
+    auth_methods: Vec<acp::AuthMethod>,
+    _io_task: Task<Result<()>>,
+    _child: smol::process::Child,
+}
+
+pub struct AcpSession {
+    thread: WeakEntity<AcpThread>,
+}
+
+const MINIMUM_SUPPORTED_VERSION: acp::ProtocolVersion = acp::V1;
+
+impl AcpConnection {
+    pub async fn stdio(
+        server_name: &'static str,
+        command: AgentServerCommand,
+        root_dir: &Path,
+        cx: &mut AsyncApp,
+    ) -> Result<Self> {
+        let mut child = util::command::new_smol_command(&command.path)
+            .args(command.args.iter().map(|arg| arg.as_str()))
+            .envs(command.env.iter().flatten())
+            .current_dir(root_dir)
+            .stdin(std::process::Stdio::piped())
+            .stdout(std::process::Stdio::piped())
+            .stderr(std::process::Stdio::inherit())
+            .kill_on_drop(true)
+            .spawn()?;
+
+        let stdout = child.stdout.take().expect("Failed to take stdout");
+        let stdin = child.stdin.take().expect("Failed to take stdin");
+
+        let sessions = Rc::new(RefCell::new(HashMap::default()));
+
+        let client = ClientDelegate {
+            sessions: sessions.clone(),
+            cx: cx.clone(),
+        };
+        let (connection, io_task) = acp::ClientSideConnection::new(client, stdin, stdout, {
+            let foreground_executor = cx.foreground_executor().clone();
+            move |fut| {
+                foreground_executor.spawn(fut).detach();
+            }
+        });
+
+        let io_task = cx.background_spawn(io_task);
+
+        let response = connection
+            .initialize(acp::InitializeRequest {
+                protocol_version: acp::VERSION,
+                client_capabilities: acp::ClientCapabilities {
+                    fs: acp::FileSystemCapability {
+                        read_text_file: true,
+                        write_text_file: true,
+                    },
+                },
+            })
+            .await?;
+
+        if response.protocol_version < MINIMUM_SUPPORTED_VERSION {
+            return Err(UnsupportedVersion.into());
+        }
+
+        Ok(Self {
+            auth_methods: response.auth_methods,
+            connection: connection.into(),
+            server_name,
+            sessions,
+            _child: child,
+            _io_task: io_task,
+        })
+    }
+}
+
+impl AgentConnection for AcpConnection {
+    fn new_thread(
+        self: Rc<Self>,
+        project: Entity<Project>,
+        cwd: &Path,
+        cx: &mut AsyncApp,
+    ) -> Task<Result<Entity<AcpThread>>> {
+        let conn = self.connection.clone();
+        let sessions = self.sessions.clone();
+        let cwd = cwd.to_path_buf();
+        cx.spawn(async move |cx| {
+            let response = conn
+                .new_session(acp::NewSessionRequest {
+                    mcp_servers: vec![],
+                    cwd,
+                })
+                .await?;
+
+            let Some(session_id) = response.session_id else {
+                anyhow::bail!(AuthRequired);
+            };
+
+            let thread = cx.new(|cx| {
+                AcpThread::new(
+                    self.server_name,
+                    self.clone(),
+                    project,
+                    session_id.clone(),
+                    cx,
+                )
+            })?;
+
+            let session = AcpSession {
+                thread: thread.downgrade(),
+            };
+            sessions.borrow_mut().insert(session_id, session);
+
+            Ok(thread)
+        })
+    }
+
+    fn auth_methods(&self) -> &[acp::AuthMethod] {
+        &self.auth_methods
+    }
+
+    fn authenticate(&self, method_id: acp::AuthMethodId, cx: &mut App) -> Task<Result<()>> {
+        let conn = self.connection.clone();
+        cx.foreground_executor().spawn(async move {
+            let result = conn
+                .authenticate(acp::AuthenticateRequest {
+                    method_id: method_id.clone(),
+                })
+                .await?;
+
+            Ok(result)
+        })
+    }
+
+    fn prompt(&self, params: acp::PromptRequest, cx: &mut App) -> Task<Result<()>> {
+        let conn = self.connection.clone();
+        cx.foreground_executor()
+            .spawn(async move { Ok(conn.prompt(params).await?) })
+    }
+
+    fn cancel(&self, session_id: &acp::SessionId, cx: &mut App) {
+        let conn = self.connection.clone();
+        let params = acp::CancelledNotification {
+            session_id: session_id.clone(),
+        };
+        cx.foreground_executor()
+            .spawn(async move { conn.cancelled(params).await })
+            .detach();
+    }
+}
+
+struct ClientDelegate {
+    sessions: Rc<RefCell<HashMap<acp::SessionId, AcpSession>>>,
+    cx: AsyncApp,
+}
+
+impl acp::Client for ClientDelegate {
+    async fn request_permission(
+        &self,
+        arguments: acp::RequestPermissionRequest,
+    ) -> Result<acp::RequestPermissionResponse, acp::Error> {
+        let cx = &mut self.cx.clone();
+        let rx = self
+            .sessions
+            .borrow()
+            .get(&arguments.session_id)
+            .context("Failed to get session")?
+            .thread
+            .update(cx, |thread, cx| {
+                thread.request_tool_call_permission(arguments.tool_call, arguments.options, cx)
+            })?;
+
+        let result = rx.await;
+
+        let outcome = match result {
+            Ok(option) => acp::RequestPermissionOutcome::Selected { option_id: option },
+            Err(oneshot::Canceled) => acp::RequestPermissionOutcome::Cancelled,
+        };
+
+        Ok(acp::RequestPermissionResponse { outcome })
+    }
+
+    async fn write_text_file(
+        &self,
+        arguments: acp::WriteTextFileRequest,
+    ) -> Result<(), acp::Error> {
+        let cx = &mut self.cx.clone();
+        let task = self
+            .sessions
+            .borrow()
+            .get(&arguments.session_id)
+            .context("Failed to get session")?
+            .thread
+            .update(cx, |thread, cx| {
+                thread.write_text_file(arguments.path, arguments.content, cx)
+            })?;
+
+        task.await?;
+
+        Ok(())
+    }
+
+    async fn read_text_file(
+        &self,
+        arguments: acp::ReadTextFileRequest,
+    ) -> Result<acp::ReadTextFileResponse, acp::Error> {
+        let cx = &mut self.cx.clone();
+        let task = self
+            .sessions
+            .borrow()
+            .get(&arguments.session_id)
+            .context("Failed to get session")?
+            .thread
+            .update(cx, |thread, cx| {
+                thread.read_text_file(arguments.path, arguments.line, arguments.limit, false, cx)
+            })?;
+
+        let content = task.await?;
+
+        Ok(acp::ReadTextFileResponse { content })
+    }
+
+    async fn session_notification(
+        &self,
+        notification: acp::SessionNotification,
+    ) -> Result<(), acp::Error> {
+        let cx = &mut self.cx.clone();
+        let sessions = self.sessions.borrow();
+        let session = sessions
+            .get(&notification.session_id)
+            .context("Failed to get session")?;
+
+        session.thread.update(cx, |thread, cx| {
+            thread.handle_session_update(notification.update, cx)
+        })??;
+
+        Ok(())
+    }
+}