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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
use crate::cache::HttpCache;
use crate::util::path::specifier_to_file_path;
use deno_core::parking_lot::Mutex;
use deno_core::ModuleSpecifier;
use std::collections::HashMap;
use std::fs;
use std::path::Path;
use std::sync::Arc;
use std::time::SystemTime;
pub fn calculate_fs_version(
cache: &Arc<dyn HttpCache>,
specifier: &ModuleSpecifier,
) -> Option<String> {
match specifier.scheme() {
"npm" | "node" | "data" | "blob" => None,
"file" => specifier_to_file_path(specifier)
.ok()
.and_then(|path| calculate_fs_version_at_path(&path)),
_ => calculate_fs_version_in_cache(cache, specifier),
}
}
/// Calculate a version for for a given path.
pub fn calculate_fs_version_at_path(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())
}
}
fn calculate_fs_version_in_cache(
cache: &Arc<dyn HttpCache>,
specifier: &ModuleSpecifier,
) -> Option<String> {
let Ok(cache_key) = cache.cache_item_key(specifier) else {
return Some("1".to_string());
};
match cache.read_modified_time(&cache_key) {
Ok(Some(modified)) => {
match modified.duration_since(SystemTime::UNIX_EPOCH) {
Ok(n) => Some(n.as_millis().to_string()),
Err(_) => Some("1".to_string()),
}
}
Ok(None) => None,
Err(_) => 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, Clone)]
pub struct CacheMetadata {
cache: Arc<dyn HttpCache>,
metadata: Arc<Mutex<HashMap<ModuleSpecifier, Metadata>>>,
}
impl CacheMetadata {
pub fn new(cache: Arc<dyn HttpCache>) -> Self {
Self {
cache,
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 matches!(
specifier.scheme(),
"file" | "npm" | "node" | "data" | "blob"
) {
return None;
}
let version = calculate_fs_version_in_cache(&self.cache, specifier);
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 matches!(
specifier.scheme(),
"file" | "npm" | "node" | "data" | "blob"
) {
return None;
}
let cache_key = self.cache.cache_item_key(specifier).ok()?;
let specifier_metadata = self.cache.read_metadata(&cache_key).ok()??;
let values = Arc::new(parse_metadata(&specifier_metadata.headers));
let version = calculate_fs_version_in_cache(&self.cache, specifier);
let mut metadata_map = self.metadata.lock();
let metadata = Metadata { values, version };
metadata_map.insert(specifier.clone(), metadata.clone());
Some(metadata)
}
pub fn set_cache(&mut self, cache: Arc<dyn HttpCache>) {
self.cache = cache;
self.metadata.lock().clear();
}
}
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