use anyhow::{Context as _, Result};use futures::{    AsyncBufReadExt as _, StreamExt as _,    channel::mpsc::{self},    io::BufReader,};use gpui::{App, Entity, EntityId, Task, Window};use jupyter_protocol::{    ExecutionState, JupyterKernelspec, JupyterMessage, KernelInfoReply,    connection_info::{ConnectionInfo, Transport},};use project::Fs;use runtimelib::dirs;use smol::net::TcpListener;use std::{    env,    fmt::Debug,    net::{IpAddr, Ipv4Addr, SocketAddr},    path::PathBuf,    sync::Arc,}; use uuid::Uuid; use super::{KernelSession, RunningKernel, start_kernel_tasks}; #[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<std::process::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_std_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 {            log::info!(                "LocalKernelSpecification: applying env to command: {:?}",                env.keys()            );            cmd.envs(env);        } else {            log::info!("LocalKernelSpecification: no env in kernelspec");        }         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: util::process::Child,    connection_path: PathBuf,    _process_status_task: Option<Task<()>>,    pub working_directory: PathBuf,    pub request_tx: mpsc::Sender<JupyterMessage>,    pub stdin_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<S: KernelSession + 'static>(        kernel_specification: LocalKernelSpecification,        entity_id: EntityId,        working_directory: PathBuf,        fs: Arc<dyn Fs>,        // todo: convert to weak view        session: Entity<S>,        window: &mut Window,        cx: &mut App,    ) -> Task<Result<Box<dyn RunningKernel>>> {        window.spawn(cx, async move |cx| {            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)?;            cmd.current_dir(&working_directory);             let mut process = util::process::Child::spawn(                cmd,                std::process::Stdio::piped(),                std::process::Stdio::piped(),                std::process::Stdio::piped(),            )?;             let session_id = Uuid::new_v4().to_string();             let iopub_socket =                runtimelib::create_client_iopub_connection(&connection_info, "", &session_id)                    .await?;            let control_socket =                runtimelib::create_client_control_connection(&connection_info, &session_id).await?;             let peer_identity = runtimelib::peer_identity_for_session(&session_id)?;            let shell_socket = runtimelib::create_client_shell_connection_with_identity(                &connection_info,                &session_id,                peer_identity.clone(),            )            .await?;            let stdin_socket = runtimelib::create_client_stdin_connection_with_identity(                &connection_info,                &session_id,                peer_identity,            )            .await?;             let (request_tx, stdin_tx) = start_kernel_tasks(                session.clone(),                iopub_socket,                shell_socket,                control_socket,                stdin_socket,                cx,            );             let stderr = process.stderr.take();            let stdout = process.stdout.take();             cx.spawn(async move |_cx| {                use futures::future::Either;                 let stderr_lines = match stderr {                    Some(s) => Either::Left(                        BufReader::new(s)                            .lines()                            .map(|line| (log::Level::Error, line)),                    ),                    None => Either::Right(futures::stream::empty()),                };                let stdout_lines = match stdout {                    Some(s) => Either::Left(                        BufReader::new(s)                            .lines()                            .map(|line| (log::Level::Info, line)),                    ),                    None => Either::Right(futures::stream::empty()),                };                let mut lines = futures::stream::select(stderr_lines, stdout_lines);                while let Some((level, Ok(line))) = lines.next().await {                    log::log!(level, "kernel: {}", line);                }            })            .detach();             let status = process.status();             let process_status_task = cx.spawn(async move |cx| {                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(cx, |session, cx| {                    session.kernel_errored(error_message, cx);                     cx.notify();                });            });             anyhow::Ok(Box::new(Self {                process,                request_tx,                stdin_tx,                working_directory,                _process_status_task: Some(process_status_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 stdin_tx(&self) -> mpsc::Sender<JupyterMessage> {        self.stdin_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.kill();        Task::ready(Ok(()))    }     fn kill(&mut self) {        self._process_status_task.take();        self.request_tx.close_channel();        self.stdin_tx.close_channel();        self.process.kill().ok();    }} impl Drop for NativeRunningKernel {    fn drop(&mut self) {        std::fs::remove_file(&self.connection_path).ok();        self.kill();    }} 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().into_owned()    } 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                    && 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_command("python")        .arg("-c")        .arg("import sys; print(sys.prefix)")        .output()        .await;     if let Ok(command) = command        && 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",                            "language": "typescript",                            "argv": ["deno", "run", "--unstable", "--allow-net", "--allow-read", "https://deno.land/std/http/file_server.ts", "{connection_file}"],                            "env": {}                        }"#                    }                },            }),        )        .await;         let mut kernels = read_kernels_dir(PathBuf::from("/jupyter/kernels"), fs.as_ref())            .await            .unwrap();         kernels.sort_by(|a, b| a.name.cmp(&b.name));         assert_eq!(            kernels.iter().map(|c| c.name.clone()).collect::<Vec<_>>(),            vec!["deno", "python"]        );    }}