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https://github.com/denoland/deno.git
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104 lines
3 KiB
Rust
104 lines
3 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use crate::cache::CachedUrlMetadata;
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use crate::cache::HttpCache;
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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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/// Calculate a version for for a given path.
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pub fn calculate_fs_version(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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/// 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, Default, Clone)]
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pub struct CacheMetadata {
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cache: 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(location: &Path) -> Self {
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Self {
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cache: HttpCache::new(location),
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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 specifier.scheme() == "file" || specifier.scheme() == "npm" {
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return None;
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}
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let version = self
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.cache
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.get_cache_filename(specifier)
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.and_then(|ref path| calculate_fs_version(path));
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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 specifier.scheme() == "file" || specifier.scheme() == "npm" {
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return None;
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}
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let cache_filename = self.cache.get_cache_filename(specifier)?;
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let specifier_metadata = CachedUrlMetadata::read(&cache_filename).ok()?;
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let values = Arc::new(parse_metadata(&specifier_metadata.headers));
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let version = calculate_fs_version(&cache_filename);
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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_location(&mut self, location: &Path) {
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self.cache = HttpCache::new(location);
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self.metadata.lock().clear();
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}
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}
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