use std::env::consts::EXE_EXTENSION;
use std::fmt::Display;
use std::path::{Path, PathBuf};
use std::str::FromStr;
use std::sync::LazyLock;
use anyhow::{Context, Result};
use itertools::Itertools;
use prek_consts::env_vars::EnvVars;
use serde::Deserialize;
use target_lexicon::{Architecture, HOST, OperatingSystem};
use tracing::{debug, trace, warn};
use crate::fs::LockedFile;
use crate::http::{REQWEST_CLIENT, download_and_extract};
use crate::languages::deno::DenoRequest;
use crate::languages::deno::version::DenoVersion;
use crate::process::Cmd;
use crate::store::Store;
#[derive(Debug)]
pub(crate) struct DenoResult {
deno: PathBuf,
version: DenoVersion,
}
impl Display for DenoResult {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}@{}", self.deno.display(), self.version)?;
Ok(())
}
}
static DENO_BINARY_NAME: LazyLock<String> = LazyLock::new(|| {
if let Ok(name) = EnvVars::var(EnvVars::PREK_INTERNAL__DENO_BINARY_NAME) {
name
} else {
"deno".to_string()
}
});
impl DenoResult {
pub(crate) fn from_executable(deno: PathBuf) -> Self {
Self {
deno,
version: DenoVersion::default(),
}
}
pub(crate) fn from_dir(dir: &Path) -> Self {
let deno = bin_dir(dir).join("deno").with_extension(EXE_EXTENSION);
Self::from_executable(deno)
}
pub(crate) fn with_version(mut self, version: DenoVersion) -> Self {
self.version = version;
self
}
pub(crate) async fn fill_version(mut self) -> Result<Self> {
let output = Cmd::new(&self.deno, "deno --version")
.env(EnvVars::DENO_NO_UPDATE_CHECK, "1")
.arg("--version")
.check(true)
.output()
.await?;
let output_str = String::from_utf8_lossy(&output.stdout);
let version_str = output_str
.lines()
.next()
.and_then(|line| line.strip_prefix("deno "))
.and_then(|rest| rest.split_whitespace().next())
.context("Failed to parse deno version output")?;
self.version = version_str
.parse()
.context("Failed to parse deno version")?;
Ok(self)
}
pub(crate) fn deno(&self) -> &Path {
&self.deno
}
pub(crate) fn version(&self) -> &DenoVersion {
&self.version
}
}
pub(crate) struct DenoInstaller {
root: PathBuf,
}
impl DenoInstaller {
pub(crate) fn new(root: PathBuf) -> Self {
Self { root }
}
pub(crate) async fn install(
&self,
store: &Store,
request: &DenoRequest,
allows_download: bool,
) -> Result<DenoResult> {
fs_err::tokio::create_dir_all(&self.root).await?;
let _lock = LockedFile::acquire(self.root.join(".lock"), "deno").await?;
if let Ok(deno_result) = self.find_installed(request) {
trace!(%deno_result, "Found installed deno");
return Ok(deno_result);
}
if let Some(deno_result) = self.find_system_deno(request).await? {
trace!(%deno_result, "Using system deno");
return Ok(deno_result);
}
if !allows_download {
anyhow::bail!("No suitable system Deno version found and downloads are disabled");
}
let resolved_version = self.resolve_version(request).await?;
trace!(version = %resolved_version, "Downloading deno");
self.download(store, &resolved_version).await
}
fn find_installed(&self, req: &DenoRequest) -> Result<DenoResult> {
let mut installed = fs_err::read_dir(&self.root)
.ok()
.into_iter()
.flatten()
.filter_map(|entry| match entry {
Ok(entry) => Some(entry),
Err(err) => {
warn!(?err, "Failed to read entry");
None
}
})
.filter(|entry| entry.file_type().is_ok_and(|f| f.is_dir()))
.filter_map(|entry| {
let dir_name = entry.file_name();
let version = DenoVersion::from_str(&dir_name.to_string_lossy()).ok()?;
Some((version, entry.path()))
})
.sorted_unstable_by(|(a, _), (b, _)| a.cmp(b))
.rev();
installed
.find_map(|(v, path)| {
if req.matches(&v, Some(&path)) {
Some(DenoResult::from_dir(&path).with_version(v))
} else {
None
}
})
.context("No installed deno version matches the request")
}
async fn resolve_version(&self, req: &DenoRequest) -> Result<DenoVersion> {
let versions = self
.list_remote_versions()
.await
.context("Failed to list remote versions")?;
let version = versions
.into_iter()
.find(|version| req.matches(version, None))
.context("Version not found on remote")?;
Ok(version)
}
async fn list_remote_versions(&self) -> Result<Vec<DenoVersion>> {
#[derive(Deserialize)]
struct VersionsResponse {
cli: Vec<String>,
}
let url = "https://deno.com/versions.json";
let response: VersionsResponse = REQWEST_CLIENT.get(url).send().await?.json().await?;
let versions: Vec<DenoVersion> = response
.cli
.into_iter()
.filter_map(|v| DenoVersion::from_str(&v).ok())
.collect();
if versions.is_empty() {
anyhow::bail!("No Deno versions found");
}
Ok(versions)
}
async fn download(&self, store: &Store, version: &DenoVersion) -> Result<DenoResult> {
let arch = match HOST.architecture {
Architecture::X86_64 => "x86_64",
Architecture::Aarch64(_) => "aarch64",
_ => anyhow::bail!("Unsupported architecture for Deno"),
};
let os = match HOST.operating_system {
OperatingSystem::Darwin(_) => "apple-darwin",
OperatingSystem::Linux => "unknown-linux-gnu",
OperatingSystem::Windows => "pc-windows-msvc",
_ => anyhow::bail!("Unsupported OS for Deno"),
};
let filename = format!("deno-{arch}-{os}.zip");
let url = format!("https://dl.deno.land/release/v{version}/{filename}");
let target = self.root.join(version.to_string());
download_and_extract(&url, &filename, store, async |extracted| {
if target.exists() {
debug!(target = %target.display(), "Removing existing deno");
fs_err::tokio::remove_dir_all(&target).await?;
}
let extracted_binary = if extracted.is_file() {
extracted.to_path_buf()
} else {
extracted.join("deno").with_extension(EXE_EXTENSION)
};
let target_bin_dir = bin_dir(&target);
fs_err::tokio::create_dir_all(&target_bin_dir).await?;
let target_binary = target_bin_dir.join("deno").with_extension(EXE_EXTENSION);
debug!(?extracted_binary, target = %target_binary.display(), "Moving deno to target");
fs_err::tokio::rename(&extracted_binary, &target_binary).await?;
#[cfg(unix)]
{
use std::os::unix::fs::PermissionsExt;
let mut perms = fs_err::tokio::metadata(&target_binary).await?.permissions();
perms.set_mode(0o755);
fs_err::tokio::set_permissions(&target_binary, perms).await?;
}
anyhow::Ok(())
})
.await
.context("Failed to download and extract deno")?;
Ok(DenoResult::from_dir(&target).with_version(version.clone()))
}
async fn find_system_deno(&self, deno_request: &DenoRequest) -> Result<Option<DenoResult>> {
let deno_paths = match which::which_all(&*DENO_BINARY_NAME) {
Ok(paths) => paths,
Err(e) => {
debug!("No deno executables found in PATH: {}", e);
return Ok(None);
}
};
for deno_path in deno_paths {
match DenoResult::from_executable(deno_path).fill_version().await {
Ok(deno_result) => {
if deno_request.matches(&deno_result.version, Some(&deno_result.deno)) {
trace!(
%deno_result,
"Found a matching system deno"
);
return Ok(Some(deno_result));
}
trace!(
%deno_result,
"System deno does not match requested version"
);
}
Err(e) => {
warn!(?e, "Failed to get version for system deno");
}
}
}
debug!(
?deno_request,
"No system deno matches the requested version"
);
Ok(None)
}
}
pub(crate) fn bin_dir(prefix: &Path) -> PathBuf {
prefix.join("bin")
}