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7f15126f23
This adds a new `PathRef` struct to test_util for making it easier to work with paths in test code. I'm going to expand on this more in the future.
280 lines
8.9 KiB
Rust
280 lines
8.9 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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//! This module is meant to eventually implement HTTP cache
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//! as defined in RFC 7234 (<https://tools.ietf.org/html/rfc7234>).
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//! Currently it's a very simplified version to fulfill Deno needs
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//! at hand.
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use crate::http_util::HeadersMap;
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use crate::util;
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use deno_core::error::generic_error;
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use deno_core::error::AnyError;
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use deno_core::serde::Deserialize;
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use deno_core::serde::Serialize;
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use deno_core::serde_json;
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use deno_core::url::Url;
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use std::fs;
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use std::fs::File;
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use std::io;
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use std::path::Path;
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use std::path::PathBuf;
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use std::time::SystemTime;
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use super::CACHE_PERM;
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/// Turn base of url (scheme, hostname, port) into a valid filename.
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/// This method replaces port part with a special string token (because
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/// ":" cannot be used in filename on some platforms).
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/// Ex: $DENO_DIR/deps/https/deno.land/
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fn base_url_to_filename(url: &Url) -> Option<PathBuf> {
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let mut out = PathBuf::new();
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let scheme = url.scheme();
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out.push(scheme);
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match scheme {
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"http" | "https" => {
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let host = url.host_str().unwrap();
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let host_port = match url.port() {
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Some(port) => format!("{host}_PORT{port}"),
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None => host.to_string(),
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};
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out.push(host_port);
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}
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"data" | "blob" => (),
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scheme => {
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log::debug!("Don't know how to create cache name for scheme: {}", scheme);
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return None;
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}
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};
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Some(out)
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}
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/// Turn provided `url` into a hashed filename.
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/// URLs can contain a lot of characters that cannot be used
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/// in filenames (like "?", "#", ":"), so in order to cache
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/// them properly they are deterministically hashed into ASCII
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/// strings.
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///
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/// NOTE: this method is `pub` because it's used in integration_tests
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pub fn url_to_filename(url: &Url) -> Option<PathBuf> {
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let mut cache_filename = base_url_to_filename(url)?;
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let mut rest_str = url.path().to_string();
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if let Some(query) = url.query() {
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rest_str.push('?');
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rest_str.push_str(query);
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}
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// NOTE: fragment is omitted on purpose - it's not taken into
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// account when caching - it denotes parts of webpage, which
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// in case of static resources doesn't make much sense
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let hashed_filename = util::checksum::gen(&[rest_str.as_bytes()]);
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cache_filename.push(hashed_filename);
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Some(cache_filename)
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}
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/// Cached metadata about a url.
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#[derive(Serialize, Deserialize)]
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pub struct CachedUrlMetadata {
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pub headers: HeadersMap,
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pub url: String,
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#[serde(default = "SystemTime::now")]
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pub now: SystemTime,
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}
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impl CachedUrlMetadata {
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pub fn write(&self, cache_filename: &Path) -> Result<(), AnyError> {
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let metadata_filename = Self::filename(cache_filename);
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let json = serde_json::to_string_pretty(self)?;
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util::fs::atomic_write_file(&metadata_filename, json, CACHE_PERM)?;
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Ok(())
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}
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pub fn read(cache_filename: &Path) -> Result<Self, AnyError> {
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let metadata_filename = Self::filename(cache_filename);
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let metadata = fs::read_to_string(metadata_filename)?;
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let metadata: Self = serde_json::from_str(&metadata)?;
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Ok(metadata)
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}
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/// Ex: $DENO_DIR/deps/https/deno.land/c885b7dcf1d6936e33a9cc3a2d74ec79bab5d733d3701c85a029b7f7ec9fbed4.metadata.json
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pub fn filename(cache_filename: &Path) -> PathBuf {
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cache_filename.with_extension("metadata.json")
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}
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}
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#[derive(Debug, Clone, Default)]
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pub struct HttpCache {
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pub location: PathBuf,
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}
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impl HttpCache {
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/// Returns a new instance.
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///
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/// `location` must be an absolute path.
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pub fn new(location: PathBuf) -> Self {
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assert!(location.is_absolute());
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Self { location }
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}
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/// Ensures the location of the cache.
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fn ensure_dir_exists(&self, path: &Path) -> io::Result<()> {
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if path.is_dir() {
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return Ok(());
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}
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fs::create_dir_all(path).map_err(|e| {
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io::Error::new(
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e.kind(),
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format!(
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"Could not create remote modules cache location: {path:?}\nCheck the permission of the directory."
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),
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)
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})
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}
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pub fn get_cache_filename(&self, url: &Url) -> Option<PathBuf> {
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Some(self.location.join(url_to_filename(url)?))
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}
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// TODO(bartlomieju): this method should check headers file
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// and validate against ETAG/Last-modified-as headers.
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// ETAG check is currently done in `cli/file_fetcher.rs`.
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pub fn get(
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&self,
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url: &Url,
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) -> Result<(File, HeadersMap, SystemTime), AnyError> {
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let cache_filename = self.location.join(
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url_to_filename(url)
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.ok_or_else(|| generic_error("Can't convert url to filename."))?,
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);
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let metadata_filename = CachedUrlMetadata::filename(&cache_filename);
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let file = File::open(cache_filename)?;
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let metadata = fs::read_to_string(metadata_filename)?;
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let metadata: CachedUrlMetadata = serde_json::from_str(&metadata)?;
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Ok((file, metadata.headers, metadata.now))
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}
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pub fn set(
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&self,
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url: &Url,
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headers_map: HeadersMap,
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content: &[u8],
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) -> Result<(), AnyError> {
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let cache_filename = self.location.join(
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url_to_filename(url)
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.ok_or_else(|| generic_error("Can't convert url to filename."))?,
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);
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// Create parent directory
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let parent_filename = cache_filename
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.parent()
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.expect("Cache filename should have a parent dir");
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self.ensure_dir_exists(parent_filename)?;
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// Cache content
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util::fs::atomic_write_file(&cache_filename, content, CACHE_PERM)?;
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let metadata = CachedUrlMetadata {
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now: SystemTime::now(),
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url: url.to_string(),
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headers: headers_map,
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};
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metadata.write(&cache_filename)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::collections::HashMap;
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use std::io::Read;
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use test_util::TempDir;
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#[test]
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fn test_create_cache() {
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let dir = TempDir::new();
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let cache_path = dir.path().join("foobar");
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// HttpCache should be created lazily on first use:
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// when zipping up a local project with no external dependencies
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// "$DENO_DIR/deps" is empty. When unzipping such project
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// "$DENO_DIR/deps" might not get restored and in situation
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// when directory is owned by root we might not be able
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// to create that directory. However if it's not needed it
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// doesn't make sense to return error in such specific scenarios.
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// For more details check issue:
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// https://github.com/denoland/deno/issues/5688
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let cache = HttpCache::new(cache_path.to_path_buf());
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assert!(!cache.location.exists());
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cache
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.set(
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&Url::parse("http://example.com/foo/bar.js").unwrap(),
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HeadersMap::new(),
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b"hello world",
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)
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.expect("Failed to add to cache");
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assert!(cache.ensure_dir_exists(&cache.location).is_ok());
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assert!(cache_path.is_dir());
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}
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#[test]
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fn test_get_set() {
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let dir = TempDir::new();
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let cache = HttpCache::new(dir.path().to_path_buf());
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let url = Url::parse("https://deno.land/x/welcome.ts").unwrap();
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let mut headers = HashMap::new();
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headers.insert(
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"content-type".to_string(),
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"application/javascript".to_string(),
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);
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headers.insert("etag".to_string(), "as5625rqdsfb".to_string());
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let content = b"Hello world";
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let r = cache.set(&url, headers, content);
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eprintln!("result {r:?}");
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assert!(r.is_ok());
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let r = cache.get(&url);
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assert!(r.is_ok());
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let (mut file, headers, _) = r.unwrap();
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let mut content = String::new();
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file.read_to_string(&mut content).unwrap();
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assert_eq!(content, "Hello world");
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assert_eq!(
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headers.get("content-type").unwrap(),
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"application/javascript"
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);
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assert_eq!(headers.get("etag").unwrap(), "as5625rqdsfb");
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assert_eq!(headers.get("foobar"), None);
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}
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#[test]
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fn test_url_to_filename() {
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let test_cases = [
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("https://deno.land/x/foo.ts", "https/deno.land/2c0a064891b9e3fbe386f5d4a833bce5076543f5404613656042107213a7bbc8"),
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(
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"https://deno.land:8080/x/foo.ts",
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"https/deno.land_PORT8080/2c0a064891b9e3fbe386f5d4a833bce5076543f5404613656042107213a7bbc8",
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),
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("https://deno.land/", "https/deno.land/8a5edab282632443219e051e4ade2d1d5bbc671c781051bf1437897cbdfea0f1"),
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(
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"https://deno.land/?asdf=qwer",
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"https/deno.land/e4edd1f433165141015db6a823094e6bd8f24dd16fe33f2abd99d34a0a21a3c0",
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),
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// should be the same as case above, fragment (#qwer) is ignored
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// when hashing
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(
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"https://deno.land/?asdf=qwer#qwer",
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"https/deno.land/e4edd1f433165141015db6a823094e6bd8f24dd16fe33f2abd99d34a0a21a3c0",
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),
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(
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"data:application/typescript;base64,ZXhwb3J0IGNvbnN0IGEgPSAiYSI7CgpleHBvcnQgZW51bSBBIHsKICBBLAogIEIsCiAgQywKfQo=",
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"data/c21c7fc382b2b0553dc0864aa81a3acacfb7b3d1285ab5ae76da6abec213fb37",
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),
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(
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"data:text/plain,Hello%2C%20Deno!",
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"data/967374e3561d6741234131e342bf5c6848b70b13758adfe23ee1a813a8131818",
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)
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];
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for (url, expected) in test_cases.iter() {
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let u = Url::parse(url).unwrap();
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let p = url_to_filename(&u).unwrap();
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assert_eq!(p, PathBuf::from(expected));
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}
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}
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}
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