use anyhow::{anyhow, bail, Context, Result};use async_compression::futures::bufread::GzipDecoder;use async_tar::Archive;use futures::lock::Mutex;use futures::{future::Shared, FutureExt};use gpui::{executor::Background, Task};use serde::Deserialize;use smol::{fs, io::BufReader, process::Command};use std::process::{Output, Stdio};use std::{    env::consts,    path::{Path, PathBuf},    sync::{Arc, OnceLock},};use util::http::HttpClient; const VERSION: &str = "v18.15.0"; static RUNTIME_INSTANCE: OnceLock<Arc<NodeRuntime>> = OnceLock::new(); #[derive(Debug, Deserialize)]#[serde(rename_all = "kebab-case")]pub struct NpmInfo {    #[serde(default)]    dist_tags: NpmInfoDistTags,    versions: Vec<String>,} #[derive(Debug, Deserialize, Default)]pub struct NpmInfoDistTags {    latest: Option<String>,} pub struct NodeRuntime {    http: Arc<dyn HttpClient>,    background: Arc<Background>,    installation_path: Mutex<Option<Shared<Task<Result<PathBuf, Arc<anyhow::Error>>>>>>,} impl NodeRuntime {    pub fn instance(http: Arc<dyn HttpClient>, background: Arc<Background>) -> Arc<NodeRuntime> {        RUNTIME_INSTANCE            .get_or_init(|| {                Arc::new(NodeRuntime {                    http,                    background,                    installation_path: Mutex::new(None),                })            })            .clone()    }     pub async fn binary_path(&self) -> Result<PathBuf> {        let installation_path = self.install_if_needed().await?;        Ok(installation_path.join("bin/node"))    }     pub async fn run_npm_subcommand(        &self,        directory: Option<&Path>,        subcommand: &str,        args: &[&str],    ) -> Result<Output> {        let attempt = |installation_path: PathBuf| async move {            let mut env_path = installation_path.join("bin").into_os_string();            if let Some(existing_path) = std::env::var_os("PATH") {                if !existing_path.is_empty() {                    env_path.push(":");                    env_path.push(&existing_path);                }            }             let node_binary = installation_path.join("bin/node");            let npm_file = installation_path.join("bin/npm");             if smol::fs::metadata(&node_binary).await.is_err() {                return Err(anyhow!("missing node binary file"));            }             if smol::fs::metadata(&npm_file).await.is_err() {                return Err(anyhow!("missing npm file"));            }             let mut command = Command::new(node_binary);            command.env("PATH", env_path);            command.arg(npm_file).arg(subcommand).args(args);             if let Some(directory) = directory {                command.current_dir(directory);            }             command.output().await.map_err(|e| anyhow!("{e}"))        };         let installation_path = self.install_if_needed().await?;        let mut output = attempt(installation_path.clone()).await;        if output.is_err() {            output = attempt(installation_path).await;            if output.is_err() {                return Err(anyhow!(                    "failed to launch npm subcommand {subcommand} subcommand"                ));            }        }         if let Ok(output) = &output {            if !output.status.success() {                return Err(anyhow!(                    "failed to execute npm {subcommand} subcommand:\nstdout: {:?}\nstderr: {:?}",                    String::from_utf8_lossy(&output.stdout),                    String::from_utf8_lossy(&output.stderr)                ));            }        }         output.map_err(|e| anyhow!("{e}"))    }     pub async fn npm_package_latest_version(&self, name: &str) -> Result<String> {        let output = self            .run_npm_subcommand(                None,                "info",                &[                    name,                    "--json",                    "-fetch-retry-mintimeout",                    "2000",                    "-fetch-retry-maxtimeout",                    "5000",                    "-fetch-timeout",                    "5000",                ],            )            .await?;         let mut info: NpmInfo = serde_json::from_slice(&output.stdout)?;        info.dist_tags            .latest            .or_else(|| info.versions.pop())            .ok_or_else(|| anyhow!("no version found for npm package {}", name))    }     pub async fn npm_install_packages(        &self,        directory: &Path,        packages: impl IntoIterator<Item = (&str, &str)>,    ) -> Result<()> {        let packages: Vec<_> = packages            .into_iter()            .map(|(name, version)| format!("{name}@{version}"))            .collect();         let mut arguments: Vec<_> = packages.iter().map(|p| p.as_str()).collect();        arguments.extend_from_slice(&[            "-fetch-retry-mintimeout",            "2000",            "-fetch-retry-maxtimeout",            "5000",            "-fetch-timeout",            "5000",        ]);         self.run_npm_subcommand(Some(directory), "install", &arguments)            .await?;        Ok(())    }     async fn install_if_needed(&self) -> Result<PathBuf> {        let task = self            .installation_path            .lock()            .await            .get_or_insert_with(|| {                let http = self.http.clone();                self.background                    .spawn(async move { Self::install(http).await.map_err(Arc::new) })                    .shared()            })            .clone();         task.await.map_err(|e| anyhow!("{}", e))    }     async fn install(http: Arc<dyn HttpClient>) -> Result<PathBuf> {        log::info!("installing Node runtime");        let arch = match consts::ARCH {            "x86_64" => "x64",            "aarch64" => "arm64",            other => bail!("Running on unsupported platform: {other}"),        };         let folder_name = format!("node-{VERSION}-darwin-{arch}");        let node_containing_dir = util::paths::SUPPORT_DIR.join("node");        let node_dir = node_containing_dir.join(folder_name);        let node_binary = node_dir.join("bin/node");        let npm_file = node_dir.join("bin/npm");         let result = Command::new(&node_binary)            .arg(npm_file)            .arg("--version")            .stdin(Stdio::null())            .stdout(Stdio::null())            .stderr(Stdio::null())            .status()            .await;        let valid = matches!(result, Ok(status) if status.success());         if !valid {            _ = fs::remove_dir_all(&node_containing_dir).await;            fs::create_dir(&node_containing_dir)                .await                .context("error creating node containing dir")?;             let file_name = format!("node-{VERSION}-darwin-{arch}.tar.gz");            let url = format!("https://nodejs.org/dist/{VERSION}/{file_name}");            let mut response = http                .get(&url, Default::default(), true)                .await                .context("error downloading Node binary tarball")?;             let decompressed_bytes = GzipDecoder::new(BufReader::new(response.body_mut()));            let archive = Archive::new(decompressed_bytes);            archive.unpack(&node_containing_dir).await?;        }         anyhow::Ok(node_dir)    }}