Make limits cache update only occur exactly once per period

backend/Cargo.lock

@@ -1170,7 +1170,7 @@ checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
 
 [[package]]
 name = "powertools"
-version = "2.0.0-alpha4"
+version = "2.0.0-alpha5"
 dependencies = [
  "async-trait",
  "chrono",

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "powertools"
-version = "2.0.0-alpha4"
+version = "2.0.0-alpha5"
 edition = "2021"
 authors = ["NGnius (Graham) <ngniusness@gmail.com>"]
 description = "Backend (superuser) functionality for PowerTools"

backend/src/consts.rs

@@ -12,6 +12,8 @@ pub const LIMITS_FILE: &str = "limits_cache.ron";
 pub const LIMITS_REFRESH_PERIOD: std::time::Duration = std::time::Duration::from_secs(60 * 60 * 24); // 1 day
 #[cfg(feature = "online")]
 pub const LIMITS_STARTUP_WAIT: std::time::Duration = std::time::Duration::from_secs(60); // 1 minute
+#[cfg(feature = "online")]
+pub const LIMITS_CHECK_PERIOD: std::time::Duration = std::time::Duration::from_secs(5 * 60); // 5 minutes
 pub const LIMITS_OVERRIDE_FILE: &str = "limits_override.ron";
 
 #[cfg(feature = "online")]

backend/src/settings/detect/auto_detect.rs

@@ -8,28 +8,7 @@ use crate::persist::{DriverJson, SettingsJson};
 use crate::settings::{Driver, General, ProviderBuilder, TBattery, TCpus, TGeneral, TGpu};
 
 fn get_limits() -> limits_core::json_v2::Base {
-    let limits_path = super::utility::limits_path();
-    match File::open(&limits_path) {
-        Ok(f) => match ron::de::from_reader(f) {
-            Ok(lim) => lim,
-            Err(e) => {
-                log::warn!(
-                    "Failed to parse limits file `{}`, cannot use for auto_detect: {}",
-                    limits_path.display(),
-                    e
-                );
-                limits_core::json_v2::Base::default()
-            }
-        },
-        Err(e) => {
-            log::warn!(
-                "Failed to open limits file `{}`: {}",
-                limits_path.display(),
-                e
-            );
     super::limits_worker::get_limits_cached()
-        }
-    }
 }
 
 fn get_limits_overrides() -> Option<Limits> {

backend/src/settings/detect/limits_worker.rs

@@ -2,6 +2,11 @@ use std::thread::{self, JoinHandle};
 
 use limits_core::json_v2::Base;
 
+#[inline]
+fn expired_updated_time() -> chrono::DateTime<chrono::offset::Utc> {
+    chrono::offset::Utc::now() - (crate::consts::LIMITS_REFRESH_PERIOD * 2)
+}
+
 #[cfg(feature = "online")]
 pub fn spawn() -> JoinHandle<()> {
     thread::spawn(move || {
@@ -12,34 +17,45 @@ pub fn spawn() -> JoinHandle<()> {
         loop {
             if (limits_path.exists() && limits_path.is_file()) || !limits_path.exists() {
                 // try to load limits from file, fallback to built-in default
-                let base = if limits_path.exists() {
+                let mut base = if limits_path.exists() {
                     match std::fs::File::open(&limits_path) {
                         Ok(f) => match ron::de::from_reader(f) {
                             Ok(b) => b,
                             Err(e) => {
                                 log::error!("Cannot parse {}: {}", limits_path.display(), e);
-                                Base::default()
+                                crate::utility::CachedData {
+                                    data: Base::default(),
+                                    updated: expired_updated_time(),
+                                }
                             }
                         },
                         Err(e) => {
                             log::error!("Cannot open {}: {}", limits_path.display(), e);
-                            Base::default()
+                            crate::utility::CachedData {
+                                data: Base::default(),
+                                updated: expired_updated_time(),
+                            }
                         }
                     }
                 } else {
-                    let base = Base::default();
+                    let mut base = crate::utility::CachedData {
-                    save_base(&base, &limits_path);
+                        data: Base::default(),
+                        updated: expired_updated_time(),
+                    };
+                    save_base(&mut base, &limits_path);
                     base
                 };
-                crate::api::web::set_base_url(base.store);
+                crate::api::web::set_base_url(base.data.store.clone());
-                if let Some(refresh) = &base.refresh {
+                if let Some(refresh) = &base.data.refresh {
+                    if base.needs_update(crate::consts::LIMITS_REFRESH_PERIOD) {
                         // try to retrieve newer version
                         match ureq::get(refresh).call() {
                             Ok(response) => {
                                 let json_res: std::io::Result<Base> = response.into_json();
                                 match json_res {
                                     Ok(new_base) => {
-                                    save_base(&new_base, &limits_path);
+                                        base.data = new_base;
+                                        save_base(&mut base, &limits_path);
                                     }
                                     Err(e) => {
                                         log::error!("Cannot parse response from `{}`: {}", refresh, e)
@@ -48,6 +64,7 @@ pub fn spawn() -> JoinHandle<()> {
                             }
                             Err(e) => log::warn!("Cannot download limits from `{}`: {}", refresh, e),
                         }
+                    }
                 } else {
                     log::info!("limits_worker refresh is empty, terminating...");
                     break;
@@ -55,7 +72,7 @@ pub fn spawn() -> JoinHandle<()> {
             } else if !limits_path.is_file() {
                 log::error!("Path for storing limits is not a file!");
             }
-            thread::sleep(crate::consts::LIMITS_REFRESH_PERIOD);
+            thread::sleep(crate::consts::LIMITS_CHECK_PERIOD);
         }
         log::warn!("limits_worker completed!");
     })
@@ -70,31 +87,33 @@ pub fn spawn() -> JoinHandle<()> {
 
 pub fn get_limits_cached() ->  Base {
     let limits_path = super::utility::limits_path();
-    if limits_path.is_file() {
+    let cached: crate::utility::CachedData<Base> = if limits_path.is_file() {
         match std::fs::File::open(&limits_path) {
             Ok(f) => match ron::de::from_reader(f) {
                 Ok(b) => b,
                 Err(e) => {
                     log::error!("Cannot parse {}: {}", limits_path.display(), e);
-                    Base::default()
+                    return Base::default();
                 }
             },
             Err(e) => {
                 log::error!("Cannot open {}: {}", limits_path.display(), e);
-                Base::default()
+                return Base::default();
             }
         }
     } else {
-        Base::default()
+        return Base::default();
-    }
+    };
+    cached.data
 }
 
 #[cfg(feature = "online")]
-fn save_base(new_base: &Base, path: impl AsRef<std::path::Path>) {
+fn save_base(new_base: &mut crate::utility::CachedData<Base>, path: impl AsRef<std::path::Path>) {
     let limits_path = path.as_ref();
+    new_base.updated = chrono::offset::Utc::now();
     match std::fs::File::create(&limits_path) {
         Ok(f) => {
-            match ron::ser::to_writer_pretty(f, &new_base, crate::utility::ron_pretty_config()) {
+            match ron::ser::to_writer_pretty(f, new_base, crate::utility::ron_pretty_config()) {
                 Ok(_) => log::info!("Successfully saved new limits to {}", limits_path.display()),
                 Err(e) => log::error!(
                     "Failed to save limits json to file `{}`: {}",

backend/src/utility.rs

@@ -3,6 +3,9 @@
 use std::io::{Read, Write};
 use std::os::unix::fs::PermissionsExt;
 
+use serde::{Deserialize, Serialize};
+use chrono::{offset::Utc, DateTime};
+
 /*pub fn unwrap_lock<'a, T: Sized>(
     result: LockResult<MutexGuard<'a, T>>,
     lock_name: &str,
@@ -16,6 +19,18 @@ use std::os::unix::fs::PermissionsExt;
     }
 }*/
 
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct CachedData<T> {
+    pub data: T,
+    pub updated: DateTime<Utc>,
+}
+
+impl <T> CachedData<T> {
+    pub fn needs_update(&self, max_age: std::time::Duration) -> bool {
+        self.updated < (Utc::now() - max_age)
+    }
+}
+
 pub fn ron_pretty_config() -> ron::ser::PrettyConfig {
     ron::ser::PrettyConfig::default()
         .struct_names(true)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "PowerTools",
-  "version": "2.0.0-alpha4",
+  "version": "2.0.0-alpha5",
   "description": "Power tweaks for power users",
   "scripts": {
     "build": "shx rm -rf dist && rollup -c",