Remove blocking net request in main thread to speed up startup for slow connections

backend/src/settings/detect/auto_detect.rs

@@ -23,11 +23,11 @@ fn get_limits() -> limits_core::json::Base {
         },
         Err(e) => {
             log::warn!(
-                "Failed to open limits file `{}` (trying force refresh...): {}",
+                "Failed to open limits file `{}`: {}",
                 limits_path.display(),
                 e
             );
-            super::limits_worker::get_limits_blocking()
+            super::limits_worker::get_limits_cached()
         }
     }
 }

backend/src/settings/detect/limits_worker.rs

@@ -11,10 +11,10 @@ pub fn spawn() -> JoinHandle<()> {
         let sleep_dur = Duration::from_secs(60 * 60 * 24); // 1 day
         let limits_path = super::utility::limits_path();
         loop {
-            thread::sleep(sleep_dur);
             if (limits_path.exists() && limits_path.is_file()) || !limits_path.exists() {
                 // try to load limits from file, fallback to built-in default
-                let base = match std::fs::File::open(&limits_path) {
+                let base = if limits_path.exists() {
+                    match std::fs::File::open(&limits_path) {
                         Ok(f) => match serde_json::from_reader(f) {
                             Ok(b) => b,
                             Err(e) => {
@@ -26,6 +26,11 @@ pub fn spawn() -> JoinHandle<()> {
                             log::error!("Cannot open {}: {}", limits_path.display(), e);
                             Base::default()
                         }
+                    }
+                } else {
+                    let base = Base::default();
+                    save_base(&base, &limits_path);
+                    base
                 };
                 if let Some(refresh) = &base.refresh {
                     // try to retrieve newer version
@@ -50,6 +55,7 @@ pub fn spawn() -> JoinHandle<()> {
             } else if !limits_path.is_file() {
                 log::error!("Path for storing limits is not a file!");
             }
+            thread::sleep(sleep_dur);
         }
         log::warn!("limits_worker completed!");
     })
@@ -62,7 +68,7 @@ pub fn spawn() -> JoinHandle<()> {
     })
 }
 
-pub fn get_limits_blocking() -> Base {
+pub fn get_limits_cached() -> Base {
     let limits_path = super::utility::limits_path();
     if limits_path.is_file() {
         match std::fs::File::open(&limits_path) {
@@ -79,25 +85,6 @@ pub fn get_limits_blocking() -> Base {
             }
         }
     } else {
-        #[cfg(feature = "online")]
-        {
-            let refresh = Base::default().refresh.unwrap();
-            match ureq::get(&refresh) // try to retrieve newer version
-                .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);
-                            return new_base;
-                        }
-                        Err(e) => log::error!("Cannot parse response from `{}`: {}", refresh, e),
-                    }
-                }
-                Err(e) => log::warn!("Cannot download limits from `{}`: {}", refresh, e),
-            }
-        }
         Base::default()
     }
 }