chore: add default system time accuracy check on startup

Signed-off-by: Henry <mail@henrygressmann.de>

Author: explodingcamera

Cargo.lock

@@ -95,6 +95,7 @@ r2d2 = { version = "0.8", default-features = false }
 refinery = { version = "0.9", default-features = false }
 refinery-core = { version = "0.9", default-features = false }
 rusqlite = { version = "0.40", features = ["bundled", "chrono", "modern_sqlite"] }
+rsntp = { version = "4.1.2", default-features = false, features = ["async"] }
 
 [dev-dependencies]
 axum-test = { version = "21" }

Cargo.toml

@@ -117,6 +117,19 @@ impl Liwan {
     }
 
     pub fn run_background_tasks(&self) {
+        if !self.config.disable_ntp_check {
+            tokio::task::spawn(async {
+                if let Ok(result) = rsntp::AsyncSntpClient::new().synchronize("pool.ntp.org").await {
+                    let offset_seconds = result.clock_offset().as_secs_f64();
+                    if offset_seconds.abs() >= 5.0 * 60.0 {
+                        tracing::warn!(
+                            offset_seconds,
+                            "System clock is not synchronized; analytics timestamps may be inaccurate"
+                        );
+                    }
+                }
+            });
+        }
         #[cfg(feature = "geoip")]
         tokio::task::spawn(core::keep_updated(self.geoip.clone()));
     }

src/app/mod.rs

@@ -23,6 +23,9 @@ pub struct Config {
     // don't load favicons from the duckduckgo api
     pub disable_favicons: bool,
 
+    #[serde(default)]
+    pub disable_ntp_check: bool,
+
     #[serde(default = "default_data_dir")]
     pub data_dir: String,
 
@@ -56,6 +59,7 @@ impl Default for Config {
             duckdb: Default::default(),
             limits: Default::default(),
             disable_favicons: false,
+            disable_ntp_check: false,
             listen: None,
             port: None,
             trusted_headers: default_trusted_headers(),