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285 lines
9 KiB
Rust
285 lines
9 KiB
Rust
// Copyright 2018-2022 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 log::error;
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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!("{}_PORT{}", host, 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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error!("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: &Path) -> Self {
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assert!(location.is_absolute());
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Self {
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location: location.to_owned(),
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}
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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: {:?}\nCheck the permission of the directory.",
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path
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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 mut cache_path = dir.path().to_owned();
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cache_path.push("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);
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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());
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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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