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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use std::collections::HashMap;
use std::collections::HashSet;
use std::sync::Arc;
use async_trait::async_trait;
use deno_core::anyhow::anyhow;
use deno_core::error::AnyError;
use deno_core::futures::future::BoxFuture;
use deno_core::futures::future::Shared;
use deno_core::futures::FutureExt;
use deno_core::parking_lot::Mutex;
use deno_npm::registry::NpmPackageInfo;
use deno_npm::registry::NpmRegistryApi;
use deno_npm::registry::NpmRegistryPackageInfoLoadError;
use crate::args::CacheSetting;
use crate::util::sync::AtomicFlag;
use super::cache::NpmCache;
use super::cache::RegistryInfoDownloader;
#[derive(Debug)]
pub struct CliNpmRegistryApi(Option<Arc<CliNpmRegistryApiInner>>);
impl CliNpmRegistryApi {
pub fn new(
cache: Arc<NpmCache>,
registry_info_downloader: Arc<RegistryInfoDownloader>,
) -> Self {
Self(Some(Arc::new(CliNpmRegistryApiInner {
cache,
force_reload_flag: Default::default(),
mem_cache: Default::default(),
previously_reloaded_packages: Default::default(),
registry_info_downloader,
})))
}
/// Clears the internal memory cache.
pub fn clear_memory_cache(&self) {
self.inner().clear_memory_cache();
}
fn inner(&self) -> &Arc<CliNpmRegistryApiInner> {
// this panicking indicates a bug in the code where this
// wasn't initialized
self.0.as_ref().unwrap()
}
}
#[async_trait(?Send)]
impl NpmRegistryApi for CliNpmRegistryApi {
async fn package_info(
&self,
name: &str,
) -> Result<Arc<NpmPackageInfo>, NpmRegistryPackageInfoLoadError> {
match self.inner().maybe_package_info(name).await {
Ok(Some(info)) => Ok(info),
Ok(None) => Err(NpmRegistryPackageInfoLoadError::PackageNotExists {
package_name: name.to_string(),
}),
Err(err) => {
Err(NpmRegistryPackageInfoLoadError::LoadError(Arc::new(err)))
}
}
}
fn mark_force_reload(&self) -> bool {
self.inner().mark_force_reload()
}
}
type CacheItemPendingResult =
Result<Option<Arc<NpmPackageInfo>>, Arc<AnyError>>;
#[derive(Debug)]
enum CacheItem {
Pending(Shared<BoxFuture<'static, CacheItemPendingResult>>),
Resolved(Option<Arc<NpmPackageInfo>>),
}
#[derive(Debug)]
struct CliNpmRegistryApiInner {
cache: Arc<NpmCache>,
force_reload_flag: AtomicFlag,
mem_cache: Mutex<HashMap<String, CacheItem>>,
previously_reloaded_packages: Mutex<HashSet<String>>,
registry_info_downloader: Arc<RegistryInfoDownloader>,
}
impl CliNpmRegistryApiInner {
pub async fn maybe_package_info(
self: &Arc<Self>,
name: &str,
) -> Result<Option<Arc<NpmPackageInfo>>, AnyError> {
let (created, future) = {
let mut mem_cache = self.mem_cache.lock();
match mem_cache.get(name) {
Some(CacheItem::Resolved(maybe_info)) => {
return Ok(maybe_info.clone());
}
Some(CacheItem::Pending(future)) => (false, future.clone()),
None => {
let future = {
let api = self.clone();
let name = name.to_string();
async move {
if (api.cache.cache_setting().should_use_for_npm_package(&name) && !api.force_reload_flag.is_raised())
// if this has been previously reloaded, then try loading from the
// file system cache
|| !api.previously_reloaded_packages.lock().insert(name.to_string())
{
// attempt to load from the file cache
if let Some(info) = api.load_file_cached_package_info(&name).await {
let result = Some(Arc::new(info));
return Ok(result);
}
}
api.registry_info_downloader
.load_package_info(&name)
.await
.map_err(Arc::new)
}
.boxed()
.shared()
};
mem_cache
.insert(name.to_string(), CacheItem::Pending(future.clone()));
(true, future)
}
}
};
if created {
match future.await {
Ok(maybe_info) => {
// replace the cache item to say it's resolved now
self
.mem_cache
.lock()
.insert(name.to_string(), CacheItem::Resolved(maybe_info.clone()));
Ok(maybe_info)
}
Err(err) => {
// purge the item from the cache so it loads next time
self.mem_cache.lock().remove(name);
Err(anyhow!("{:#}", err))
}
}
} else {
Ok(future.await.map_err(|err| anyhow!("{:#}", err))?)
}
}
fn mark_force_reload(&self) -> bool {
// never force reload the registry information if reloading
// is disabled or if we're already reloading
if matches!(
self.cache.cache_setting(),
CacheSetting::Only | CacheSetting::ReloadAll
) {
return false;
}
if self.force_reload_flag.raise() {
self.clear_memory_cache();
true
} else {
false
}
}
async fn load_file_cached_package_info(
&self,
name: &str,
) -> Option<NpmPackageInfo> {
let result = deno_core::unsync::spawn_blocking({
let cache = self.cache.clone();
let name = name.to_string();
move || cache.load_package_info(&name)
})
.await
.unwrap();
match result {
Ok(value) => value,
Err(err) => {
if cfg!(debug_assertions) {
panic!("error loading cached npm package info for {name}: {err:#}");
} else {
None
}
}
}
}
fn clear_memory_cache(&self) {
self.mem_cache.lock().clear();
}
}
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