use anyhow::{Context as _, Result};use futures::{    channel::mpsc::{self},    io::BufReader,    stream::{SelectAll, StreamExt},    AsyncBufReadExt as _, SinkExt as _,};use gpui::{App, AppContext as _, Entity, EntityId, Task, Window};use jupyter_protocol::{    connection_info::{ConnectionInfo, Transport},    ExecutionState, JupyterKernelspec, JupyterMessage, JupyterMessageContent, KernelInfoReply,};use project::Fs;use runtimelib::dirs;use smol::{net::TcpListener, process::Command};use std::{    env,    fmt::Debug,    net::{IpAddr, Ipv4Addr, SocketAddr},    path::PathBuf,    sync::Arc,};use uuid::Uuid; use crate::Session; use super::RunningKernel; #[derive(Debug, Clone)]pub struct LocalKernelSpecification {    pub name: String,    pub path: PathBuf,    pub kernelspec: JupyterKernelspec,} impl PartialEq for LocalKernelSpecification {    fn eq(&self, other: &Self) -> bool {        self.name == other.name && self.path == other.path    }} impl Eq for LocalKernelSpecification {} impl LocalKernelSpecification {    #[must_use]    fn command(&self, connection_path: &PathBuf) -> Result<Command> {        let argv = &self.kernelspec.argv;         anyhow::ensure!(!argv.is_empty(), "Empty argv in kernelspec {}", self.name);        anyhow::ensure!(argv.len() >= 2, "Invalid argv in kernelspec {}", self.name);        anyhow::ensure!(            argv.iter().any(|arg| arg == "{connection_file}"),            "Missing 'connection_file' in argv in kernelspec {}",            self.name        );         let mut cmd = util::command::new_smol_command(&argv[0]);         for arg in &argv[1..] {            if arg == "{connection_file}" {                cmd.arg(connection_path);            } else {                cmd.arg(arg);            }        }         if let Some(env) = &self.kernelspec.env {            cmd.envs(env);        }         Ok(cmd)    }} // Find a set of open ports. This creates a listener with port set to 0. The listener will be closed at the end when it goes out of scope.// There's a race condition between closing the ports and usage by a kernel, but it's inherent to the Jupyter protocol.async fn peek_ports(ip: IpAddr) -> Result<[u16; 5]> {    let mut addr_zeroport: SocketAddr = SocketAddr::new(ip, 0);    addr_zeroport.set_port(0);    let mut ports: [u16; 5] = [0; 5];    for i in 0..5 {        let listener = TcpListener::bind(addr_zeroport).await?;        let addr = listener.local_addr()?;        ports[i] = addr.port();    }    Ok(ports)} pub struct NativeRunningKernel {    pub process: smol::process::Child,    _shell_task: Task<Result<()>>,    _control_task: Task<Result<()>>,    _routing_task: Task<Result<()>>,    connection_path: PathBuf,    _process_status_task: Option<Task<()>>,    pub working_directory: PathBuf,    pub request_tx: mpsc::Sender<JupyterMessage>,    pub execution_state: ExecutionState,    pub kernel_info: Option<KernelInfoReply>,} impl Debug for NativeRunningKernel {    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {        f.debug_struct("RunningKernel")            .field("process", &self.process)            .finish()    }} impl NativeRunningKernel {    pub fn new(        kernel_specification: LocalKernelSpecification,        entity_id: EntityId,        working_directory: PathBuf,        fs: Arc<dyn Fs>,        // todo: convert to weak view        session: Entity<Session>,        window: &mut Window,        cx: &mut App,    ) -> Task<Result<Box<dyn RunningKernel>>> {        window.spawn(cx, |cx| async move {            let ip = IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1));            let ports = peek_ports(ip).await?;             let connection_info = ConnectionInfo {                transport: Transport::TCP,                ip: ip.to_string(),                stdin_port: ports[0],                control_port: ports[1],                hb_port: ports[2],                shell_port: ports[3],                iopub_port: ports[4],                signature_scheme: "hmac-sha256".to_string(),                key: uuid::Uuid::new_v4().to_string(),                kernel_name: Some(format!("zed-{}", kernel_specification.name)),            };             let runtime_dir = dirs::runtime_dir();            fs.create_dir(&runtime_dir)                .await                .with_context(|| format!("Failed to create jupyter runtime dir {runtime_dir:?}"))?;            let connection_path = runtime_dir.join(format!("kernel-zed-{entity_id}.json"));            let content = serde_json::to_string(&connection_info)?;            fs.atomic_write(connection_path.clone(), content).await?;             let mut cmd = kernel_specification.command(&connection_path)?;             let mut process = cmd                .current_dir(&working_directory)                .stdout(std::process::Stdio::piped())                .stderr(std::process::Stdio::piped())                .stdin(std::process::Stdio::piped())                .kill_on_drop(true)                .spawn()                .context("failed to start the kernel process")?;             let session_id = Uuid::new_v4().to_string();             let mut iopub_socket =                runtimelib::create_client_iopub_connection(&connection_info, "", &session_id)                    .await?;            let mut shell_socket =                runtimelib::create_client_shell_connection(&connection_info, &session_id).await?;            let mut control_socket =                runtimelib::create_client_control_connection(&connection_info, &session_id).await?;             let (request_tx, mut request_rx) =                futures::channel::mpsc::channel::<JupyterMessage>(100);             let (mut control_reply_tx, control_reply_rx) = futures::channel::mpsc::channel(100);            let (mut shell_reply_tx, shell_reply_rx) = futures::channel::mpsc::channel(100);             let mut messages_rx = SelectAll::new();            messages_rx.push(control_reply_rx);            messages_rx.push(shell_reply_rx);             cx.spawn({                let session = session.clone();                 |mut cx| async move {                    while let Some(message) = messages_rx.next().await {                        session                            .update_in(&mut cx, |session, window, cx| {                                session.route(&message, window, cx);                            })                            .ok();                    }                    anyhow::Ok(())                }            })            .detach();             // iopub task            cx.spawn({                let session = session.clone();                 |mut cx| async move {                    while let Ok(message) = iopub_socket.read().await {                        session                            .update_in(&mut cx, |session, window, cx| {                                session.route(&message, window, cx);                            })                            .ok();                    }                    anyhow::Ok(())                }            })            .detach();             let (mut control_request_tx, mut control_request_rx) =                futures::channel::mpsc::channel(100);            let (mut shell_request_tx, mut shell_request_rx) = futures::channel::mpsc::channel(100);             let routing_task = cx.background_spawn({                async move {                    while let Some(message) = request_rx.next().await {                        match message.content {                            JupyterMessageContent::DebugRequest(_)                            | JupyterMessageContent::InterruptRequest(_)                            | JupyterMessageContent::ShutdownRequest(_) => {                                control_request_tx.send(message).await?;                            }                            _ => {                                shell_request_tx.send(message).await?;                            }                        }                    }                    anyhow::Ok(())                }            });             let shell_task = cx.background_spawn({                async move {                    while let Some(message) = shell_request_rx.next().await {                        shell_socket.send(message).await.ok();                        let reply = shell_socket.read().await?;                        shell_reply_tx.send(reply).await?;                    }                    anyhow::Ok(())                }            });             let control_task = cx.background_spawn({                async move {                    while let Some(message) = control_request_rx.next().await {                        control_socket.send(message).await.ok();                        let reply = control_socket.read().await?;                        control_reply_tx.send(reply).await?;                    }                    anyhow::Ok(())                }            });             let stderr = process.stderr.take();             cx.spawn(|mut _cx| async move {                if stderr.is_none() {                    return;                }                let reader = BufReader::new(stderr.unwrap());                let mut lines = reader.lines();                while let Some(Ok(line)) = lines.next().await {                    log::error!("kernel: {}", line);                }            })            .detach();             let stdout = process.stdout.take();             cx.spawn(|mut _cx| async move {                if stdout.is_none() {                    return;                }                let reader = BufReader::new(stdout.unwrap());                let mut lines = reader.lines();                while let Some(Ok(line)) = lines.next().await {                    log::info!("kernel: {}", line);                }            })            .detach();             let status = process.status();             let process_status_task = cx.spawn(|mut cx| async move {                let error_message = match status.await {                    Ok(status) => {                        if status.success() {                            log::info!("kernel process exited successfully");                            return;                        }                         format!("kernel process exited with status: {:?}", status)                    }                    Err(err) => {                        format!("kernel process exited with error: {:?}", err)                    }                };                 log::error!("{}", error_message);                 session                    .update(&mut cx, |session, cx| {                        session.kernel_errored(error_message, cx);                         cx.notify();                    })                    .ok();            });             anyhow::Ok(Box::new(Self {                process,                request_tx,                working_directory,                _process_status_task: Some(process_status_task),                _shell_task: shell_task,                _control_task: control_task,                _routing_task: routing_task,                connection_path,                execution_state: ExecutionState::Idle,                kernel_info: None,            }) as Box<dyn RunningKernel>)        })    }} impl RunningKernel for NativeRunningKernel {    fn request_tx(&self) -> mpsc::Sender<JupyterMessage> {        self.request_tx.clone()    }     fn working_directory(&self) -> &PathBuf {        &self.working_directory    }     fn execution_state(&self) -> &ExecutionState {        &self.execution_state    }     fn set_execution_state(&mut self, state: ExecutionState) {        self.execution_state = state;    }     fn kernel_info(&self) -> Option<&KernelInfoReply> {        self.kernel_info.as_ref()    }     fn set_kernel_info(&mut self, info: KernelInfoReply) {        self.kernel_info = Some(info);    }     fn force_shutdown(&mut self, _window: &mut Window, _cx: &mut App) -> Task<anyhow::Result<()>> {        self._process_status_task.take();        self.request_tx.close_channel();         Task::ready(match self.process.kill() {            Ok(_) => Ok(()),            Err(error) => Err(anyhow::anyhow!(                "Failed to kill the kernel process: {}",                error            )),        })    }} impl Drop for NativeRunningKernel {    fn drop(&mut self) {        std::fs::remove_file(&self.connection_path).ok();        self.request_tx.close_channel();        self.process.kill().ok();    }} async fn read_kernelspec_at(    // Path should be a directory to a jupyter kernelspec, as in    // /usr/local/share/jupyter/kernels/python3    kernel_dir: PathBuf,    fs: &dyn Fs,) -> Result<LocalKernelSpecification> {    let path = kernel_dir;    let kernel_name = if let Some(kernel_name) = path.file_name() {        kernel_name.to_string_lossy().to_string()    } else {        anyhow::bail!("Invalid kernelspec directory: {path:?}");    };     if !fs.is_dir(path.as_path()).await {        anyhow::bail!("Not a directory: {path:?}");    }     let expected_kernel_json = path.join("kernel.json");    let spec = fs.load(expected_kernel_json.as_path()).await?;    let spec = serde_json::from_str::<JupyterKernelspec>(&spec)?;     Ok(LocalKernelSpecification {        name: kernel_name,        path,        kernelspec: spec,    })} /// Read a directory of kernelspec directoriesasync fn read_kernels_dir(path: PathBuf, fs: &dyn Fs) -> Result<Vec<LocalKernelSpecification>> {    let mut kernelspec_dirs = fs.read_dir(&path).await?;     let mut valid_kernelspecs = Vec::new();    while let Some(path) = kernelspec_dirs.next().await {        match path {            Ok(path) => {                if fs.is_dir(path.as_path()).await {                    if let Ok(kernelspec) = read_kernelspec_at(path, fs).await {                        valid_kernelspecs.push(kernelspec);                    }                }            }            Err(err) => log::warn!("Error reading kernelspec directory: {err:?}"),        }    }     Ok(valid_kernelspecs)} pub async fn local_kernel_specifications(fs: Arc<dyn Fs>) -> Result<Vec<LocalKernelSpecification>> {    let mut data_dirs = dirs::data_dirs();     // Pick up any kernels from conda or conda environment    if let Ok(conda_prefix) = env::var("CONDA_PREFIX") {        let conda_prefix = PathBuf::from(conda_prefix);        let conda_data_dir = conda_prefix.join("share").join("jupyter");        data_dirs.push(conda_data_dir);    }     // Search for kernels inside the base python environment    let command = util::command::new_smol_command("python")        .arg("-c")        .arg("import sys; print(sys.prefix)")        .output()        .await;     if let Ok(command) = command {        if command.status.success() {            let python_prefix = String::from_utf8(command.stdout);            if let Ok(python_prefix) = python_prefix {                let python_prefix = PathBuf::from(python_prefix.trim());                let python_data_dir = python_prefix.join("share").join("jupyter");                data_dirs.push(python_data_dir);            }        }    }     let kernel_dirs = data_dirs        .iter()        .map(|dir| dir.join("kernels"))        .map(|path| read_kernels_dir(path, fs.as_ref()))        .collect::<Vec<_>>();     let kernel_dirs = futures::future::join_all(kernel_dirs).await;    let kernel_dirs = kernel_dirs        .into_iter()        .filter_map(Result::ok)        .flatten()        .collect::<Vec<_>>();     Ok(kernel_dirs)} #[cfg(test)]mod test {    use super::*;    use std::path::PathBuf;     use gpui::TestAppContext;    use project::FakeFs;    use serde_json::json;     #[gpui::test]    async fn test_get_kernelspecs(cx: &mut TestAppContext) {        let fs = FakeFs::new(cx.executor());        fs.insert_tree(            "/jupyter",            json!({                ".zed": {                    "settings.json": r#"{ "tab_size": 8 }"#,                    "tasks.json": r#"[{                        "label": "cargo check",                        "command": "cargo",                        "args": ["check", "--all"]                    },]"#,                },                "kernels": {                    "python": {                        "kernel.json": r#"{                            "display_name": "Python 3",                            "language": "python",                            "argv": ["python3", "-m", "ipykernel_launcher", "-f", "{connection_file}"],                            "env": {}                        }"#                    },                    "deno": {                        "kernel.json": r#"{                            "display_name": "Deno",

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