mirror of
https://github.com/denoland/deno.git
synced 2024-12-20 22:34:46 -05:00
523 lines
15 KiB
Rust
523 lines
15 KiB
Rust
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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use std::collections::BTreeMap;
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use std::collections::HashMap;
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use std::io::BufReader;
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use std::io::BufWriter;
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use std::io::Read;
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use std::io::Write;
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use std::path::Path;
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use std::path::PathBuf;
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use std::sync::Arc;
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use deno_ast::ModuleSpecifier;
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use deno_core::anyhow::bail;
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use deno_core::error::AnyError;
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use deno_core::parking_lot::Mutex;
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use deno_core::unsync::sync::AtomicFlag;
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use deno_runtime::code_cache::CodeCache;
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use deno_runtime::code_cache::CodeCacheType;
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use crate::cache::FastInsecureHasher;
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use crate::util::path::get_atomic_file_path;
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use crate::worker::CliCodeCache;
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enum CodeCacheStrategy {
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FirstRun(FirstRunCodeCacheStrategy),
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SubsequentRun(SubsequentRunCodeCacheStrategy),
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}
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct DenoCompileCodeCacheEntry {
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pub source_hash: u64,
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pub data: Vec<u8>,
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}
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pub struct DenoCompileCodeCache {
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strategy: CodeCacheStrategy,
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}
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impl DenoCompileCodeCache {
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pub fn new(file_path: PathBuf, cache_key: u64) -> Self {
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// attempt to deserialize the cache data
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match deserialize(&file_path, cache_key) {
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Ok(data) => {
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log::debug!(
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"Loaded {} code cache entries from {}",
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data.len(),
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file_path.display()
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);
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Self {
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strategy: CodeCacheStrategy::SubsequentRun(
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SubsequentRunCodeCacheStrategy {
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is_finished: AtomicFlag::lowered(),
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data: Mutex::new(data),
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},
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),
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}
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}
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Err(err) => {
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log::debug!(
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"Failed to deserialize code cache from {}: {:#}",
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file_path.display(),
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err
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);
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Self {
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strategy: CodeCacheStrategy::FirstRun(FirstRunCodeCacheStrategy {
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cache_key,
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file_path,
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is_finished: AtomicFlag::lowered(),
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data: Mutex::new(FirstRunCodeCacheData {
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cache: HashMap::new(),
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add_count: 0,
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}),
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}),
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}
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}
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}
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}
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}
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impl CodeCache for DenoCompileCodeCache {
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fn get_sync(
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&self,
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specifier: &ModuleSpecifier,
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code_cache_type: CodeCacheType,
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source_hash: u64,
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) -> Option<Vec<u8>> {
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match &self.strategy {
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CodeCacheStrategy::FirstRun(strategy) => {
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if !strategy.is_finished.is_raised() {
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// we keep track of how many times the cache is requested
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// then serialize the cache when we get that number of
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// "set" calls
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strategy.data.lock().add_count += 1;
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}
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None
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}
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CodeCacheStrategy::SubsequentRun(strategy) => {
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if strategy.is_finished.is_raised() {
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return None;
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}
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strategy.take_from_cache(specifier, code_cache_type, source_hash)
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}
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}
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}
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fn set_sync(
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&self,
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specifier: ModuleSpecifier,
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code_cache_type: CodeCacheType,
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source_hash: u64,
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bytes: &[u8],
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) {
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match &self.strategy {
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CodeCacheStrategy::FirstRun(strategy) => {
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if strategy.is_finished.is_raised() {
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return;
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}
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let data_to_serialize = {
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let mut data = strategy.data.lock();
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data.cache.insert(
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(specifier.to_string(), code_cache_type),
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DenoCompileCodeCacheEntry {
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source_hash,
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data: bytes.to_vec(),
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},
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);
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if data.add_count != 0 {
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data.add_count -= 1;
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}
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if data.add_count == 0 {
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// don't allow using the cache anymore
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strategy.is_finished.raise();
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if data.cache.is_empty() {
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None
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} else {
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Some(std::mem::take(&mut data.cache))
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}
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} else {
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None
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}
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};
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if let Some(cache_data) = &data_to_serialize {
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strategy.write_cache_data(cache_data);
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}
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}
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CodeCacheStrategy::SubsequentRun(_) => {
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// do nothing
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}
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}
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}
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}
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impl CliCodeCache for DenoCompileCodeCache {
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fn enabled(&self) -> bool {
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match &self.strategy {
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CodeCacheStrategy::FirstRun(strategy) => {
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!strategy.is_finished.is_raised()
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}
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CodeCacheStrategy::SubsequentRun(strategy) => {
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!strategy.is_finished.is_raised()
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}
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}
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}
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fn as_code_cache(self: Arc<Self>) -> Arc<dyn CodeCache> {
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self
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}
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}
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type CodeCacheKey = (String, CodeCacheType);
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struct FirstRunCodeCacheData {
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cache: HashMap<CodeCacheKey, DenoCompileCodeCacheEntry>,
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add_count: usize,
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}
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struct FirstRunCodeCacheStrategy {
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cache_key: u64,
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file_path: PathBuf,
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is_finished: AtomicFlag,
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data: Mutex<FirstRunCodeCacheData>,
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}
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impl FirstRunCodeCacheStrategy {
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fn write_cache_data(
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&self,
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cache_data: &HashMap<CodeCacheKey, DenoCompileCodeCacheEntry>,
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) {
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let count = cache_data.len();
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let temp_file = get_atomic_file_path(&self.file_path);
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match serialize(&temp_file, self.cache_key, cache_data) {
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Ok(()) => {
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if let Err(err) = std::fs::rename(&temp_file, &self.file_path) {
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log::debug!("Failed to rename code cache: {}", err);
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let _ = std::fs::remove_file(&temp_file);
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} else {
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log::debug!("Serialized {} code cache entries", count);
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}
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}
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Err(err) => {
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let _ = std::fs::remove_file(&temp_file);
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log::debug!("Failed to serialize code cache: {}", err);
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}
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}
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}
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}
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struct SubsequentRunCodeCacheStrategy {
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is_finished: AtomicFlag,
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data: Mutex<HashMap<CodeCacheKey, DenoCompileCodeCacheEntry>>,
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}
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impl SubsequentRunCodeCacheStrategy {
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fn take_from_cache(
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&self,
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specifier: &ModuleSpecifier,
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code_cache_type: CodeCacheType,
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source_hash: u64,
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) -> Option<Vec<u8>> {
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let mut data = self.data.lock();
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// todo(dsherret): how to avoid the clone here?
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let entry = data.remove(&(specifier.to_string(), code_cache_type))?;
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if entry.source_hash != source_hash {
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return None;
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}
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if data.is_empty() {
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self.is_finished.raise();
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}
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Some(entry.data)
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}
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}
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/// File format:
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/// - <header>
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/// - <cache key>
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/// - <u32: number of entries>
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/// - <[entry length]> - u64 * number of entries
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/// - <[entry]>
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/// - <[u8]: entry data>
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/// - <String: specifier>
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/// - <u8>: code cache type
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/// - <u32: specifier length>
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/// - <u64: source hash>
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/// - <u64: entry data hash>
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fn serialize(
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file_path: &Path,
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cache_key: u64,
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cache: &HashMap<CodeCacheKey, DenoCompileCodeCacheEntry>,
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) -> Result<(), AnyError> {
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let cache_file = std::fs::OpenOptions::new()
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.create(true)
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.truncate(true)
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.write(true)
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.open(file_path)?;
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let mut writer = BufWriter::new(cache_file);
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serialize_with_writer(&mut writer, cache_key, cache)
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}
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fn serialize_with_writer<T: Write>(
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writer: &mut BufWriter<T>,
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cache_key: u64,
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cache: &HashMap<CodeCacheKey, DenoCompileCodeCacheEntry>,
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) -> Result<(), AnyError> {
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// header
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writer.write_all(&cache_key.to_le_bytes())?;
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writer.write_all(&(cache.len() as u32).to_le_bytes())?;
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// lengths of each entry
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for ((specifier, _), entry) in cache {
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let len: u64 =
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entry.data.len() as u64 + specifier.len() as u64 + 1 + 4 + 8 + 8;
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writer.write_all(&len.to_le_bytes())?;
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}
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// entries
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for ((specifier, code_cache_type), entry) in cache {
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writer.write_all(&entry.data)?;
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writer.write_all(&[match code_cache_type {
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CodeCacheType::EsModule => 0,
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CodeCacheType::Script => 1,
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}])?;
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writer.write_all(specifier.as_bytes())?;
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writer.write_all(&(specifier.len() as u32).to_le_bytes())?;
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writer.write_all(&entry.source_hash.to_le_bytes())?;
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let hash: u64 = FastInsecureHasher::new_without_deno_version()
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.write(&entry.data)
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.finish();
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writer.write_all(&hash.to_le_bytes())?;
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}
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writer.flush()?;
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Ok(())
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}
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fn deserialize(
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file_path: &Path,
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expected_cache_key: u64,
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) -> Result<HashMap<CodeCacheKey, DenoCompileCodeCacheEntry>, AnyError> {
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let cache_file = std::fs::File::open(file_path)?;
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let mut reader = BufReader::new(cache_file);
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deserialize_with_reader(&mut reader, expected_cache_key)
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}
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fn deserialize_with_reader<T: Read>(
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reader: &mut BufReader<T>,
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expected_cache_key: u64,
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) -> Result<HashMap<CodeCacheKey, DenoCompileCodeCacheEntry>, AnyError> {
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// it's very important to use this below so that a corrupt cache file
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// doesn't cause a memory allocation error
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fn new_vec_sized<T: Clone>(
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capacity: usize,
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default_value: T,
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) -> Result<Vec<T>, AnyError> {
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let mut vec = Vec::new();
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vec.try_reserve(capacity)?;
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vec.resize(capacity, default_value);
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Ok(vec)
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}
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fn try_subtract(a: usize, b: usize) -> Result<usize, AnyError> {
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if a < b {
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bail!("Integer underflow");
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}
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Ok(a - b)
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}
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let mut header_bytes = vec![0; 8 + 4];
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reader.read_exact(&mut header_bytes)?;
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let actual_cache_key = u64::from_le_bytes(header_bytes[..8].try_into()?);
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if actual_cache_key != expected_cache_key {
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// cache bust
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bail!("Cache key mismatch");
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}
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let len = u32::from_le_bytes(header_bytes[8..].try_into()?) as usize;
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// read the lengths for each entry found in the file
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let entry_len_bytes_capacity = len * 8;
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let mut entry_len_bytes = new_vec_sized(entry_len_bytes_capacity, 0)?;
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reader.read_exact(&mut entry_len_bytes)?;
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let mut lengths = Vec::new();
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lengths.try_reserve(len)?;
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for i in 0..len {
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let pos = i * 8;
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lengths.push(
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u64::from_le_bytes(entry_len_bytes[pos..pos + 8].try_into()?) as usize,
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);
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}
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let mut map = HashMap::new();
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map.try_reserve(len)?;
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for len in lengths {
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let mut buffer = new_vec_sized(len, 0)?;
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reader.read_exact(&mut buffer)?;
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let entry_data_hash_start_pos = try_subtract(buffer.len(), 8)?;
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let expected_entry_data_hash =
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u64::from_le_bytes(buffer[entry_data_hash_start_pos..].try_into()?);
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let source_hash_start_pos = try_subtract(entry_data_hash_start_pos, 8)?;
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let source_hash = u64::from_le_bytes(
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buffer[source_hash_start_pos..entry_data_hash_start_pos].try_into()?,
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);
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let specifier_end_pos = try_subtract(source_hash_start_pos, 4)?;
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let specifier_len = u32::from_le_bytes(
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buffer[specifier_end_pos..source_hash_start_pos].try_into()?,
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) as usize;
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let specifier_start_pos = try_subtract(specifier_end_pos, specifier_len)?;
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let specifier = String::from_utf8(
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buffer[specifier_start_pos..specifier_end_pos].to_vec(),
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)?;
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let code_cache_type_pos = try_subtract(specifier_start_pos, 1)?;
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let code_cache_type = match buffer[code_cache_type_pos] {
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0 => CodeCacheType::EsModule,
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1 => CodeCacheType::Script,
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_ => bail!("Invalid code cache type"),
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};
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buffer.truncate(code_cache_type_pos);
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let actual_entry_data_hash: u64 =
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FastInsecureHasher::new_without_deno_version()
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.write(&buffer)
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.finish();
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if expected_entry_data_hash != actual_entry_data_hash {
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bail!("Hash mismatch.")
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}
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map.insert(
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(specifier, code_cache_type),
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DenoCompileCodeCacheEntry {
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source_hash,
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data: buffer,
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},
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);
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}
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Ok(map)
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}
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#[cfg(test)]
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mod test {
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use test_util::TempDir;
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use super::*;
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use std::fs::File;
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#[test]
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fn serialize_deserialize() {
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let cache_key = 123456;
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let cache = {
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let mut cache = HashMap::new();
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cache.insert(
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("specifier1".to_string(), CodeCacheType::EsModule),
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DenoCompileCodeCacheEntry {
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source_hash: 1,
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data: vec![1, 2, 3],
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},
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);
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cache.insert(
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("specifier2".to_string(), CodeCacheType::EsModule),
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DenoCompileCodeCacheEntry {
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source_hash: 2,
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data: vec![4, 5, 6],
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},
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);
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cache.insert(
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("specifier2".to_string(), CodeCacheType::Script),
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DenoCompileCodeCacheEntry {
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source_hash: 2,
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data: vec![6, 5, 1],
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},
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);
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cache
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};
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let mut buffer = Vec::new();
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serialize_with_writer(&mut BufWriter::new(&mut buffer), cache_key, &cache)
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.unwrap();
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let deserialized =
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deserialize_with_reader(&mut BufReader::new(&buffer[..]), cache_key)
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.unwrap();
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assert_eq!(cache, deserialized);
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}
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#[test]
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fn serialize_deserialize_empty() {
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let cache_key = 1234;
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let cache = HashMap::new();
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let mut buffer = Vec::new();
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serialize_with_writer(&mut BufWriter::new(&mut buffer), cache_key, &cache)
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.unwrap();
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let deserialized =
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deserialize_with_reader(&mut BufReader::new(&buffer[..]), cache_key)
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.unwrap();
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assert_eq!(cache, deserialized);
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}
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#[test]
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fn serialize_deserialize_corrupt() {
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let buffer = "corrupttestingtestingtesting".as_bytes().to_vec();
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let err = deserialize_with_reader(&mut BufReader::new(&buffer[..]), 1234)
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.unwrap_err();
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assert_eq!(err.to_string(), "Cache key mismatch");
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}
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#[test]
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fn code_cache() {
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let temp_dir = TempDir::new();
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let file_path = temp_dir.path().join("cache.bin").to_path_buf();
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let url1 = ModuleSpecifier::parse("https://deno.land/example1.js").unwrap();
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let url2 = ModuleSpecifier::parse("https://deno.land/example2.js").unwrap();
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// first run
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{
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let code_cache = DenoCompileCodeCache::new(file_path.clone(), 1234);
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assert!(code_cache
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.get_sync(&url1, CodeCacheType::EsModule, 0)
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.is_none());
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assert!(code_cache
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.get_sync(&url2, CodeCacheType::EsModule, 1)
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.is_none());
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assert!(code_cache.enabled());
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code_cache.set_sync(url1.clone(), CodeCacheType::EsModule, 0, &[1, 2, 3]);
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assert!(code_cache.enabled());
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assert!(!file_path.exists());
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code_cache.set_sync(url2.clone(), CodeCacheType::EsModule, 1, &[2, 1, 3]);
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assert!(file_path.exists()); // now the new code cache exists
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assert!(!code_cache.enabled()); // no longer enabled
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}
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// second run
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{
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let code_cache = DenoCompileCodeCache::new(file_path.clone(), 1234);
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assert!(code_cache.enabled());
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let result1 = code_cache
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.get_sync(&url1, CodeCacheType::EsModule, 0)
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.unwrap();
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assert!(code_cache.enabled());
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let result2 = code_cache
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.get_sync(&url2, CodeCacheType::EsModule, 1)
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.unwrap();
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assert!(!code_cache.enabled()); // no longer enabled
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assert_eq!(result1, vec![1, 2, 3]);
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assert_eq!(result2, vec![2, 1, 3]);
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}
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// new cache key first run
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{
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let code_cache = DenoCompileCodeCache::new(file_path.clone(), 54321);
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assert!(code_cache
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.get_sync(&url1, CodeCacheType::EsModule, 0)
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.is_none());
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assert!(code_cache
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.get_sync(&url2, CodeCacheType::EsModule, 1)
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.is_none());
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code_cache.set_sync(url1.clone(), CodeCacheType::EsModule, 0, &[2, 2, 3]);
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code_cache.set_sync(url2.clone(), CodeCacheType::EsModule, 1, &[3, 2, 3]);
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}
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// new cache key second run
|
|
{
|
|
let code_cache = DenoCompileCodeCache::new(file_path.clone(), 54321);
|
|
let result1 = code_cache
|
|
.get_sync(&url1, CodeCacheType::EsModule, 0)
|
|
.unwrap();
|
|
assert_eq!(result1, vec![2, 2, 3]);
|
|
assert!(code_cache
|
|
.get_sync(&url2, CodeCacheType::EsModule, 5) // different hash will cause none
|
|
.is_none());
|
|
}
|
|
}
|
|
}
|