mirror of
https://github.com/denoland/deno
synced 2024-08-27 20:09:17 +00:00
140 lines
3.9 KiB
Rust
140 lines
3.9 KiB
Rust
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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use crate::cache::HttpCache;
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use crate::util::path::specifier_to_file_path;
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use deno_core::parking_lot::Mutex;
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use deno_core::ModuleSpecifier;
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use std::collections::HashMap;
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use std::fs;
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use std::path::Path;
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use std::sync::Arc;
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use std::time::SystemTime;
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pub fn calculate_fs_version(
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cache: &Arc<dyn HttpCache>,
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specifier: &ModuleSpecifier,
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) -> Option<String> {
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match specifier.scheme() {
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"npm" | "node" | "data" | "blob" => None,
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"file" => specifier_to_file_path(specifier)
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.ok()
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.and_then(|path| calculate_fs_version_at_path(&path)),
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_ => calculate_fs_version_in_cache(cache, specifier),
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}
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}
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/// Calculate a version for for a given path.
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pub fn calculate_fs_version_at_path(path: &Path) -> Option<String> {
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let metadata = fs::metadata(path).ok()?;
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if let Ok(modified) = metadata.modified() {
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if let Ok(n) = modified.duration_since(SystemTime::UNIX_EPOCH) {
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Some(n.as_millis().to_string())
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} else {
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Some("1".to_string())
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}
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} else {
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Some("1".to_string())
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}
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}
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fn calculate_fs_version_in_cache(
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cache: &Arc<dyn HttpCache>,
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specifier: &ModuleSpecifier,
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) -> Option<String> {
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let Ok(cache_key) = cache.cache_item_key(specifier) else {
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return Some("1".to_string());
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};
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match cache.read_modified_time(&cache_key) {
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Ok(Some(modified)) => {
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match modified.duration_since(SystemTime::UNIX_EPOCH) {
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Ok(n) => Some(n.as_millis().to_string()),
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Err(_) => Some("1".to_string()),
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}
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}
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Ok(None) => None,
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Err(_) => Some("1".to_string()),
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}
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}
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/// Populate the metadata map based on the supplied headers
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fn parse_metadata(
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headers: &HashMap<String, String>,
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) -> HashMap<MetadataKey, String> {
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let mut metadata = HashMap::new();
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if let Some(warning) = headers.get("x-deno-warning").cloned() {
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metadata.insert(MetadataKey::Warning, warning);
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}
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metadata
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}
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#[derive(Debug, PartialEq, Eq, Hash)]
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pub enum MetadataKey {
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/// Represent the `x-deno-warning` header associated with the document
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Warning,
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}
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#[derive(Debug, Clone)]
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struct Metadata {
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values: Arc<HashMap<MetadataKey, String>>,
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version: Option<String>,
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}
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#[derive(Debug, Clone)]
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pub struct CacheMetadata {
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cache: Arc<dyn HttpCache>,
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metadata: Arc<Mutex<HashMap<ModuleSpecifier, Metadata>>>,
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}
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impl CacheMetadata {
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pub fn new(cache: Arc<dyn HttpCache>) -> Self {
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Self {
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cache,
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metadata: Default::default(),
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}
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}
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/// Return the meta data associated with the specifier. Unlike the `get()`
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/// method, redirects of the supplied specifier will not be followed.
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pub fn get(
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&self,
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specifier: &ModuleSpecifier,
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) -> Option<Arc<HashMap<MetadataKey, String>>> {
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if matches!(
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specifier.scheme(),
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"file" | "npm" | "node" | "data" | "blob"
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) {
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return None;
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}
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let version = calculate_fs_version_in_cache(&self.cache, specifier);
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let metadata = self.metadata.lock().get(specifier).cloned();
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if metadata.as_ref().and_then(|m| m.version.clone()) != version {
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self.refresh(specifier).map(|m| m.values)
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} else {
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metadata.map(|m| m.values)
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}
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}
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fn refresh(&self, specifier: &ModuleSpecifier) -> Option<Metadata> {
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if matches!(
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specifier.scheme(),
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"file" | "npm" | "node" | "data" | "blob"
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) {
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return None;
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}
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let cache_key = self.cache.cache_item_key(specifier).ok()?;
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let specifier_metadata = self.cache.read_metadata(&cache_key).ok()??;
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let values = Arc::new(parse_metadata(&specifier_metadata.headers));
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let version = calculate_fs_version_in_cache(&self.cache, specifier);
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let mut metadata_map = self.metadata.lock();
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let metadata = Metadata { values, version };
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metadata_map.insert(specifier.clone(), metadata.clone());
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Some(metadata)
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}
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pub fn set_cache(&mut self, cache: Arc<dyn HttpCache>) {
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self.cache = cache;
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self.metadata.lock().clear();
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}
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}
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