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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use crate::cache::CacherLoader;
use crate::cache::FetchCacher;
use crate::config_file::ConfigFile;
use crate::flags::Flags;
use crate::graph_util::graph_valid;
use crate::http_cache;
use crate::proc_state::ProcState;
use crate::resolver::ImportMapResolver;
use crate::resolver::JsxResolver;
use deno_core::anyhow::anyhow;
use deno_core::error::AnyError;
use deno_core::parking_lot::Mutex;
use deno_core::ModuleSpecifier;
use deno_runtime::permissions::Permissions;
use deno_runtime::tokio_util::create_basic_runtime;
use import_map::ImportMap;
use std::collections::HashMap;
use std::fs;
use std::path::Path;
use std::path::PathBuf;
use std::sync::Arc;
use std::thread;
use std::time::SystemTime;
use tokio::sync::mpsc;
use tokio::sync::oneshot;
type Request = (
Vec<(ModuleSpecifier, deno_graph::ModuleKind)>,
oneshot::Sender<Result<(), AnyError>>,
);
/// A "server" that handles requests from the language server to cache modules
/// in its own thread.
#[derive(Debug)]
pub struct CacheServer(mpsc::UnboundedSender<Request>);
impl CacheServer {
pub async fn new(
maybe_cache_path: Option<PathBuf>,
maybe_import_map: Option<Arc<ImportMap>>,
maybe_config_file: Option<ConfigFile>,
maybe_ca_stores: Option<Vec<String>>,
maybe_ca_file: Option<String>,
unsafely_ignore_certificate_errors: Option<Vec<String>>,
) -> Self {
let (tx, mut rx) = mpsc::unbounded_channel::<Request>();
let _join_handle = thread::spawn(move || {
let runtime = create_basic_runtime();
runtime.block_on(async {
let ps = ProcState::build(Arc::new(Flags {
cache_path: maybe_cache_path,
ca_stores: maybe_ca_stores,
ca_file: maybe_ca_file,
unsafely_ignore_certificate_errors,
..Default::default()
}))
.await
.unwrap();
let maybe_import_map_resolver =
maybe_import_map.map(ImportMapResolver::new);
let maybe_jsx_resolver = maybe_config_file.as_ref().and_then(|cf| {
cf.to_maybe_jsx_import_source_module()
.map(|im| JsxResolver::new(im, maybe_import_map_resolver.clone()))
});
let maybe_resolver = if maybe_jsx_resolver.is_some() {
maybe_jsx_resolver.as_ref().map(|jr| jr.as_resolver())
} else {
maybe_import_map_resolver
.as_ref()
.map(|im| im.as_resolver())
};
let maybe_imports = maybe_config_file
.and_then(|cf| cf.to_maybe_imports().ok())
.flatten();
let mut cache = FetchCacher::new(
ps.dir.gen_cache.clone(),
ps.file_fetcher.clone(),
Permissions::allow_all(),
Permissions::allow_all(),
);
while let Some((roots, tx)) = rx.recv().await {
let graph = deno_graph::create_graph(
roots,
false,
maybe_imports.clone(),
cache.as_mut_loader(),
maybe_resolver,
None,
None,
None,
)
.await;
if tx.send(graph_valid(&graph, true, false)).is_err() {
log::warn!("cannot send to client");
}
}
})
});
Self(tx)
}
/// Attempt to cache the supplied module specifiers and their dependencies in
/// the current DENO_DIR, returning any errors, so they can be returned to the
/// client.
pub async fn cache(
&self,
roots: Vec<(ModuleSpecifier, deno_graph::ModuleKind)>,
) -> Result<(), AnyError> {
let (tx, rx) = oneshot::channel::<Result<(), AnyError>>();
if self.0.send((roots, tx)).is_err() {
return Err(anyhow!("failed to send request to cache thread"));
}
rx.await?
}
}
/// Calculate a version for for a given path.
pub fn calculate_fs_version(path: &Path) -> Option<String> {
let metadata = fs::metadata(path).ok()?;
if let Ok(modified) = metadata.modified() {
if let Ok(n) = modified.duration_since(SystemTime::UNIX_EPOCH) {
Some(n.as_millis().to_string())
} else {
Some("1".to_string())
}
} else {
Some("1".to_string())
}
}
/// Populate the metadata map based on the supplied headers
fn parse_metadata(
headers: &HashMap<String, String>,
) -> HashMap<MetadataKey, String> {
let mut metadata = HashMap::new();
if let Some(warning) = headers.get("x-deno-warning").cloned() {
metadata.insert(MetadataKey::Warning, warning);
}
metadata
}
#[derive(Debug, PartialEq, Eq, Hash)]
pub enum MetadataKey {
/// Represent the `x-deno-warning` header associated with the document
Warning,
}
#[derive(Debug, Clone)]
struct Metadata {
values: Arc<HashMap<MetadataKey, String>>,
version: Option<String>,
}
#[derive(Debug, Default, Clone)]
pub struct CacheMetadata {
cache: http_cache::HttpCache,
metadata: Arc<Mutex<HashMap<ModuleSpecifier, Metadata>>>,
}
impl CacheMetadata {
pub fn new(location: &Path) -> Self {
Self {
cache: http_cache::HttpCache::new(location),
metadata: Default::default(),
}
}
/// Return the meta data associated with the specifier. Unlike the `get()`
/// method, redirects of the supplied specifier will not be followed.
pub fn get(
&self,
specifier: &ModuleSpecifier,
) -> Option<Arc<HashMap<MetadataKey, String>>> {
if specifier.scheme() == "file" {
return None;
}
let version = self
.cache
.get_cache_filename(specifier)
.and_then(|ref path| calculate_fs_version(path));
let metadata = self.metadata.lock().get(specifier).cloned();
if metadata.as_ref().and_then(|m| m.version.clone()) != version {
self.refresh(specifier).map(|m| m.values)
} else {
metadata.map(|m| m.values)
}
}
fn refresh(&self, specifier: &ModuleSpecifier) -> Option<Metadata> {
if specifier.scheme() == "file" {
return None;
}
let cache_filename = self.cache.get_cache_filename(specifier)?;
let specifier_metadata =
http_cache::Metadata::read(&cache_filename).ok()?;
let values = Arc::new(parse_metadata(&specifier_metadata.headers));
let version = calculate_fs_version(&cache_filename);
let mut metadata_map = self.metadata.lock();
let metadata = Metadata { values, version };
metadata_map.insert(specifier.clone(), metadata.clone());
Some(metadata)
}
pub fn set_location(&mut self, location: &Path) {
self.cache = http_cache::HttpCache::new(location);
self.metadata.lock().clear();
}
}
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