Refactor cache configuration

src/bin/wasm2obj.rs

@@ -50,7 +50,7 @@ use std::str;
 use std::str::FromStr;
 use target_lexicon::Triple;
 use wasmtime_debug::{emit_debugsections, read_debuginfo};
-use wasmtime_environ::cache_config;
+use wasmtime_environ::cache_init;
 use wasmtime_environ::{
     Compiler, Cranelift, ModuleEnvironment, ModuleVmctxInfo, Tunables, VMOffsets,
 };
@@ -123,7 +123,7 @@ fn main() {
         Some(prefix)
     };
 
-    let errors = cache_config::init(
+    let errors = cache_init(
         args.flag_cache || args.flag_cache_config_file.is_some(),
         args.flag_cache_config_file.as_ref(),
         args.flag_create_cache_config,

src/bin/wasmtime.rs

@@ -45,7 +45,7 @@ use std::process::exit;
 use wabt;
 use wasi_common::preopen_dir;
 use wasmtime_api::{Config, Engine, HostRef, Instance, Module, Store};
-use wasmtime_environ::cache_config;
+use wasmtime_environ::cache_init;
 use wasmtime_interface_types::ModuleData;
 use wasmtime_jit::Features;
 use wasmtime_wasi::instantiate_wasi;
@@ -222,7 +222,7 @@ fn rmain() -> Result<(), Error> {
         Some(prefix)
     };
 
-    let errors = cache_config::init(
+    let errors = cache_init(
         args.flag_cache || args.flag_cache_config_file.is_some(),
         args.flag_cache_config_file.as_ref(),
         args.flag_create_cache_config,

src/bin/wast.rs

@@ -33,7 +33,7 @@ use pretty_env_logger;
 use serde::Deserialize;
 use std::path::Path;
 use std::process;
-use wasmtime_environ::cache_config;
+use wasmtime_environ::cache_init;
 use wasmtime_jit::{Compiler, Features};
 use wasmtime_wast::WastContext;
 
@@ -89,7 +89,7 @@ fn main() {
         Some(prefix)
     };
 
-    let errors = cache_config::init(
+    let errors = cache_init(
         args.flag_cache || args.flag_cache_config_file.is_some(),
         args.flag_cache_config_file.as_ref(),
         args.flag_create_cache_config,

wasmtime-environ/src/cache.rs

@@ -15,10 +15,13 @@ use std::io::Write;
 use std::path::{Path, PathBuf};
 use std::string::{String, ToString};
 
-pub mod config;
-use config as cache_config; // so we have namespaced methods
+mod config;
 mod worker;
 
+pub use config::init;
+use config::{cache_config, CacheConfig};
+use worker::worker;
+
 lazy_static! {
     static ref SELF_MTIME: String = {
         std::env::current_exe()
@@ -45,8 +48,9 @@ lazy_static! {
     };
 }
 
-pub struct ModuleCacheEntry {
+pub struct ModuleCacheEntry<'config> {
     mod_cache_path: Option<PathBuf>,
+    cache_config: &'config CacheConfig,
 }
 
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
@@ -68,7 +72,7 @@ type ModuleCacheDataTupleType = (
 
 struct Sha256Hasher(Sha256);
 
-impl ModuleCacheEntry {
+impl<'config> ModuleCacheEntry<'config> {
     pub fn new<'data>(
         module: &Module,
         function_body_inputs: &PrimaryMap<DefinedFuncIndex, FunctionBodyData<'data>>,
@@ -76,7 +80,25 @@ impl ModuleCacheEntry {
         compiler_name: &str,
         generate_debug_info: bool,
     ) -> Self {
-        let mod_cache_path = if cache_config::enabled() {
+        Self::new_with_config(
+            module,
+            function_body_inputs,
+            isa,
+            compiler_name,
+            generate_debug_info,
+            cache_config(),
+        )
+    }
+
+    fn new_with_config<'data>(
+        module: &Module,
+        function_body_inputs: &PrimaryMap<DefinedFuncIndex, FunctionBodyData<'data>>,
+        isa: &dyn isa::TargetIsa,
+        compiler_name: &str,
+        generate_debug_info: bool,
+        cache_config: &'config CacheConfig,
+    ) -> Self {
+        let mod_cache_path = if cache_config.enabled() {
             let hash = Sha256Hasher::digest(module, function_body_inputs);
             let compiler_dir = if cfg!(debug_assertions) {
                 format!(
@@ -98,7 +120,8 @@ impl ModuleCacheEntry {
                 mod_dbg = if generate_debug_info { ".d" } else { "" },
             );
             Some(
-                cache_config::directory()
+                cache_config
+                    .directory()
                     .join(isa.triple().to_string())
                     .join(compiler_dir)
                     .join(mod_filename),
@@ -107,7 +130,10 @@ impl ModuleCacheEntry {
             None
         };
 
-        Self { mod_cache_path }
+        Self {
+            mod_cache_path,
+            cache_config,
+        }
     }
 
     pub fn get_data(&self) -> Option<ModuleCacheData> {
@@ -121,14 +147,14 @@ impl ModuleCacheEntry {
             .map_err(|err| warn!("Failed to deserialize cached code: {}", err))
             .ok()?;
 
-        worker::on_cache_get_async(path); // call on success
+        worker().on_cache_get_async(path); // call on success
         Some(ret)
     }
 
     pub fn update_data(&self, data: &ModuleCacheData) {
         if self.update_data_impl(data).is_some() {
             let path = self.mod_cache_path.as_ref().unwrap();
-            worker::on_cache_update_async(path); // call on success
+            worker().on_cache_update_async(path); // call on success
         }
     }
 
@@ -140,7 +166,7 @@ impl ModuleCacheEntry {
             .ok()?;
         let compressed_data = zstd::encode_all(
             &serialized_data[..],
-            cache_config::baseline_compression_level(),
+            self.cache_config.baseline_compression_level(),
         )
         .map_err(|err| warn!("Failed to compress cached code: {}", err))
         .ok()?;

wasmtime-environ/src/cache/config.rs

@@ -22,46 +22,53 @@ struct Config {
     cache: CacheConfig,
 }
 
-// todo: markdown documention of these options
+// todo: markdown documention of these options (name, format, default, explanation)
 // todo: don't flush default values (create config from simple template + url to docs)
 // todo: more user-friendly cache config creation
-#[derive(Serialize, Deserialize, Debug)]
-struct CacheConfig {
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct CacheConfig {
     #[serde(skip)]
-    pub errors: Vec<String>,
+    errors: Vec<String>,
 
-    pub enabled: bool,
-    pub directory: Option<PathBuf>,
+    enabled: bool,
+    directory: Option<PathBuf>,
     #[serde(rename = "worker-event-queue-size")]
-    pub worker_event_queue_size: Option<usize>,
+    worker_event_queue_size: Option<usize>,
     #[serde(rename = "baseline-compression-level")]
-    pub baseline_compression_level: Option<i32>,
+    baseline_compression_level: Option<i32>,
     #[serde(rename = "optimized-compression-level")]
-    pub optimized_compression_level: Option<i32>,
+    optimized_compression_level: Option<i32>,
     #[serde(rename = "optimized-compression-usage-counter-threshold")]
-    pub optimized_compression_usage_counter_threshold: Option<u64>,
+    optimized_compression_usage_counter_threshold: Option<u64>,
     #[serde(
         default,
         rename = "cleanup-interval-in-seconds",
         serialize_with = "serialize_duration",
         deserialize_with = "deserialize_duration"
     )] // todo unit?
-    pub cleanup_interval: Option<Duration>,
+    cleanup_interval: Option<Duration>,
     #[serde(
         default,
         rename = "optimizing-compression-task-timeout-in-seconds",
         serialize_with = "serialize_duration",
         deserialize_with = "deserialize_duration"
     )] // todo unit?
-    pub optimizing_compression_task_timeout: Option<Duration>,
+    optimizing_compression_task_timeout: Option<Duration>,
+    #[serde(
+        default,
+        rename = "allowed-clock-drift-for-locks-from-future",
+        serialize_with = "serialize_duration",
+        deserialize_with = "deserialize_duration"
+    )] // todo unit?
+    allowed_clock_drift_for_locks_from_future: Option<Duration>,
     #[serde(rename = "files-count-soft-limit")]
-    pub files_count_soft_limit: Option<u64>,
+    files_count_soft_limit: Option<u64>,
     #[serde(rename = "files-total-size-soft-limit")]
-    pub files_total_size_soft_limit: Option<u64>, // todo unit?
+    files_total_size_soft_limit: Option<u64>, // todo unit?
     #[serde(rename = "files-count-limit-percent-if-deleting")]
-    pub files_count_limit_percent_if_deleting: Option<u8>, // todo format: integer + %
+    files_count_limit_percent_if_deleting: Option<u8>, // todo format: integer + %
     #[serde(rename = "files-total-size-limit-percent-if-deleting")]
-    pub files_total_size_limit_percent_if_deleting: Option<u8>,
+    files_total_size_limit_percent_if_deleting: Option<u8>,
 }
 
 // toml-rs fails to serialize Duration ("values must be emitted before tables")
@@ -84,53 +91,14 @@ where
 static CONFIG: Once<CacheConfig> = Once::new();
 static INIT_CALLED: AtomicBool = AtomicBool::new(false);
 
-/// Returns true if and only if the cache is enabled.
-pub fn enabled() -> bool {
-    // Not everyone knows about the cache system, i.e. the tests,
-    // so the default is cache disabled.
-    CONFIG
-        .call_once(|| CacheConfig::new_cache_disabled())
-        .enabled
-}
-
-/// Returns path to the cache directory.
+/// Returns cache configuration.
 ///
-/// Panics if the cache is disabled.
-pub fn directory() -> &'static PathBuf {
-    &CONFIG
-        .r#try()
-        .expect("Cache system must be initialized")
-        .directory
-        .as_ref()
-        .expect("All cache system settings must be validated or defaulted")
+/// If system has not been initialized, it disables it.
+/// You mustn't call init() after it.
+pub fn cache_config() -> &'static CacheConfig {
+    CONFIG.call_once(|| CacheConfig::new_cache_disabled())
 }
 
-macro_rules! generate_setting_getter {
-    ($setting:ident: $setting_type:ty) => {
-        /// Returns `$setting`.
-        ///
-        /// Panics if the cache is disabled.
-        pub fn $setting() -> $setting_type {
-            CONFIG
-                .r#try()
-                .expect("Cache system must be initialized")
-                .$setting
-                .expect("All cache system settings must be validated or defaulted")
-        }
-    };
-}
-
-generate_setting_getter!(worker_event_queue_size: usize);
-generate_setting_getter!(baseline_compression_level: i32);
-generate_setting_getter!(optimized_compression_level: i32);
-generate_setting_getter!(optimized_compression_usage_counter_threshold: u64);
-generate_setting_getter!(cleanup_interval: Duration);
-generate_setting_getter!(optimizing_compression_task_timeout: Duration);
-generate_setting_getter!(files_count_soft_limit: u64);
-generate_setting_getter!(files_total_size_soft_limit: u64);
-generate_setting_getter!(files_count_limit_percent_if_deleting: u8);
-generate_setting_getter!(files_total_size_limit_percent_if_deleting: u8);
-
 /// Initializes the cache system. Should be called exactly once,
 /// and before using the cache system. Otherwise it can panic.
 /// Returns list of errors. If empty, initialization succeeded.
@@ -178,12 +146,53 @@ const DEFAULT_OPTIMIZED_COMPRESSION_LEVEL: i32 = 20;
 const DEFAULT_OPTIMIZED_COMPRESSION_USAGE_COUNTER_THRESHOLD: u64 = 0x100;
 const DEFAULT_CLEANUP_INTERVAL: Duration = Duration::from_secs(60 * 60);
 const DEFAULT_OPTIMIZING_COMPRESSION_TASK_TIMEOUT: Duration = Duration::from_secs(30 * 60);
+const DEFAULT_ALLOWED_CLOCK_DRIFT_FOR_LOCKS_FROM_FUTURE: Duration =
+    Duration::from_secs(60 * 60 * 24);
 const DEFAULT_FILES_COUNT_SOFT_LIMIT: u64 = 0x10_000;
 const DEFAULT_FILES_TOTAL_SIZE_SOFT_LIMIT: u64 = 1024 * 1024 * 512;
 const DEFAULT_FILES_COUNT_LIMIT_PERCENT_IF_DELETING: u8 = 70;
 const DEFAULT_FILES_TOTAL_SIZE_LIMIT_PERCENT_IF_DELETING: u8 = 70;
 
+macro_rules! generate_setting_getter {
+    ($setting:ident: $setting_type:ty) => {
+        /// Returns `$setting`.
+        ///
+        /// Panics if the cache is disabled.
+        pub fn $setting(&self) -> $setting_type {
+            self
+                .$setting
+                .expect("All cache system settings must be validated or defaulted")
+        }
+    };
+}
+
 impl CacheConfig {
+    generate_setting_getter!(worker_event_queue_size: usize);
+    generate_setting_getter!(baseline_compression_level: i32);
+    generate_setting_getter!(optimized_compression_level: i32);
+    generate_setting_getter!(optimized_compression_usage_counter_threshold: u64);
+    generate_setting_getter!(cleanup_interval: Duration);
+    generate_setting_getter!(optimizing_compression_task_timeout: Duration);
+    generate_setting_getter!(allowed_clock_drift_for_locks_from_future: Duration);
+    generate_setting_getter!(files_count_soft_limit: u64);
+    generate_setting_getter!(files_total_size_soft_limit: u64);
+    generate_setting_getter!(files_count_limit_percent_if_deleting: u8);
+    generate_setting_getter!(files_total_size_limit_percent_if_deleting: u8);
+
+    /// Returns true if and only if the cache is enabled.
+    pub fn enabled(&self) -> bool {
+        self.enabled
+    }
+
+    /// Returns path to the cache directory.
+    ///
+    /// Panics if the cache is disabled.
+    pub fn directory(&self) -> &PathBuf {
+        self.directory
+            .as_ref()
+            .expect("All cache system settings must be validated or defaulted")
+    }
+
     pub fn new_cache_disabled() -> Self {
         Self {
             errors: Vec::new(),
@@ -195,6 +204,7 @@ impl CacheConfig {
             optimized_compression_usage_counter_threshold: None,
             cleanup_interval: None,
             optimizing_compression_task_timeout: None,
+            allowed_clock_drift_for_locks_from_future: None,
             files_count_soft_limit: None,
             files_total_size_soft_limit: None,
             files_count_limit_percent_if_deleting: None,
@@ -237,6 +247,7 @@ impl CacheConfig {
         config.validate_optimized_compression_usage_counter_threshold_or_default();
         config.validate_cleanup_interval_or_default();
         config.validate_optimizing_compression_task_timeout_or_default();
+        config.validate_allowed_clock_drift_for_locks_from_future_or_default();
         config.validate_files_count_soft_limit_or_default();
         config.validate_files_total_size_soft_limit_or_default();
         config.validate_files_count_limit_percent_if_deleting_or_default();
@@ -410,6 +421,13 @@ impl CacheConfig {
         }
     }
 
+    fn validate_allowed_clock_drift_for_locks_from_future_or_default(&mut self) {
+        if self.allowed_clock_drift_for_locks_from_future.is_none() {
+            self.allowed_clock_drift_for_locks_from_future =
+                Some(DEFAULT_ALLOWED_CLOCK_DRIFT_FOR_LOCKS_FROM_FUTURE);
+        }
+    }
+
     fn validate_files_count_soft_limit_or_default(&mut self) {
         if self.files_count_soft_limit.is_none() {
             self.files_count_soft_limit = Some(DEFAULT_FILES_COUNT_SOFT_LIMIT);

wasmtime-environ/src/cache/tests.rs

@@ -19,7 +19,7 @@ use tempfile;
 // Since cache system is a global thing, each test needs to be run in seperate process.
 // So, init() tests are run as integration tests.
 // However, caching is a private thing, an implementation detail, and needs to be tested
-// from the inside of the module. Thus we have one big test here.
+// from the inside of the module.
 
 #[test]
 fn test_write_read_cache() {
@@ -40,16 +40,17 @@ fn test_write_read_cache() {
     );
     fs::write(&config_path, config_content).expect("Failed to write test config file");
 
-    let errors = cache_config::init(true, Some(&config_path), false, None);
+    let errors = init(true, Some(&config_path), false, None);
     assert!(errors.is_empty());
-    assert!(cache_config::enabled());
+    let cache_config = cache_config();
+    assert!(cache_config.enabled());
     // assumption: config init creates cache directory and returns canonicalized path
     assert_eq!(
-        *cache_config::directory(),
+        *cache_config.directory(),
         fs::canonicalize(cache_dir).unwrap()
     );
     assert_eq!(
-        cache_config::baseline_compression_level(),
+        cache_config.baseline_compression_level(),
         baseline_compression_level
     );
 
@@ -276,7 +277,7 @@ fn new_module_cache_data(rng: &mut impl Rng) -> ModuleCacheData {
     ))
 }
 
-impl ModuleCacheEntry {
+impl ModuleCacheEntry<'_> {
     pub fn mod_cache_path(&self) -> &Option<PathBuf> {
         &self.mod_cache_path
     }

wasmtime-environ/src/lib.rs

@@ -54,7 +54,7 @@ pub mod lightbeam;
 pub use crate::address_map::{
     FunctionAddressMap, InstructionAddressMap, ModuleAddressMap, ModuleVmctxInfo, ValueLabelsRanges,
 };
-pub use crate::cache::config as cache_config;
+pub use crate::cache::init as cache_init;
 pub use crate::compilation::{
     Compilation, CompileError, Compiler, Relocation, RelocationTarget, Relocations,
 };

wasmtime-environ/tests/cache_default_config_in_memory.rs

@@ -1,8 +1,8 @@
-use wasmtime_environ::cache_config;
+use wasmtime_environ::cache_init;
 
 #[test]
 fn test_cache_default_config_in_memory() {
-    let errors = cache_config::init::<&str>(true, None, false, None);
+    let errors = cache_init::<&str>(true, None, false, None);
     assert!(
         errors.is_empty(),
         "This test loads config from the default location, if there's one. Make sure it's correct!"

wasmtime-environ/tests/cache_fail_calling_init_twice.rs

@@ -1,6 +1,6 @@
 use std::fs;
 use tempfile;
-use wasmtime_environ::cache_config;
+use wasmtime_environ::cache_init;
 
 #[test]
 #[should_panic]
@@ -20,7 +20,7 @@ fn test_cache_fail_calling_init_twice() {
     );
     fs::write(&config_path, config_content).expect("Failed to write test config file");
 
-    let errors = cache_config::init(true, Some(&config_path), false, None);
+    let errors = cache_init(true, Some(&config_path), false, None);
     assert!(errors.is_empty());
-    let _errors = cache_config::init(true, Some(&config_path), false, None);
+    let _errors = cache_init(true, Some(&config_path), false, None);
 }

wasmtime-environ/tests/cache_fail_invalid_config.rs

@@ -1,6 +1,6 @@
 use std::fs;
 use tempfile;
-use wasmtime_environ::cache_config;
+use wasmtime_environ::cache_init;
 
 #[test]
 fn test_cache_fail_invalid_config() {
@@ -18,6 +18,6 @@ fn test_cache_fail_invalid_config() {
     );
     fs::write(&config_path, config_content).expect("Failed to write test config file");
 
-    let errors = cache_config::init(true, Some(&config_path), false, None);
+    let errors = cache_init(true, Some(&config_path), false, None);
     assert!(!errors.is_empty());
 }

wasmtime-environ/tests/cache_fail_invalid_path_to_config.rs

@@ -1,10 +1,10 @@
 use tempfile;
-use wasmtime_environ::cache_config;
+use wasmtime_environ::cache_init;
 
 #[test]
 fn test_cache_fail_invalid_path_to_config() {
     let dir = tempfile::tempdir().expect("Can't create temporary directory");
     let config_path = dir.path().join("cache-config.toml"); // doesn't exist
-    let errors = cache_config::init(true, Some(&config_path), false, None);
+    let errors = cache_init(true, Some(&config_path), false, None);
     assert!(!errors.is_empty());
 }

wasmtime-environ/tests/cache_fail_usage_without_init.rs

@@ -1,15 +0,0 @@
-// These tests doesn't call init(), so we can test a multiple certain things here
-
-use wasmtime_environ::cache_config;
-
-#[test]
-#[should_panic]
-fn test_cache_fail_usage_without_init_directory() {
-    let _ = cache_config::directory();
-}
-
-#[test]
-#[should_panic]
-fn test_cache_fail_usage_without_init_baseline_compression_level() {
-    let _ = cache_config::baseline_compression_level();
-}

wasmtime-environ/tests/cache_write_default_config.rs

@@ -1,12 +1,12 @@
 use tempfile;
-use wasmtime_environ::cache_config;
+use wasmtime_environ::cache_init;
 
 #[test]
 fn test_cache_write_default_config() {
     let dir = tempfile::tempdir().expect("Can't create temporary directory");
     let config_path = dir.path().join("cache-config.toml");
 
-    let errors = cache_config::init(true, Some(&config_path), true, None);
+    let errors = cache_init(true, Some(&config_path), true, None);
     assert!(errors.is_empty());
     assert!(config_path.exists());
 }