fix: disable logging from non-main threads because of performance problems

src/lib.rs

@@ -639,6 +639,10 @@ fn init_common(
     }
 
     cbus::init_cbus_endpoint();
+    // There's a problem with cbus channels at the moment, they introduce too
+    // much performance penalty when polling them if they're empty,
+    // so we only enable the thread-safe logger in debug builds for now
+    #[cfg(debug_assertions)]
     tlog::init_thread_safe_logger();
 
     if config.instance.shredding() {

src/tlog.rs

@@ -189,8 +189,10 @@ pub fn log_from_non_tx_thread(level: slog::Level, message: String) {
         return;
     };
 
-    // TODO: check log level and exit early
-    let sender = sender.as_ref().expect("is set at picodata startup");
+    let Some(sender) = sender.as_ref() else {
+        // Thread-safe logger is disabled
+        return;
+    };
 
     let res = sender.send(ThreadSafeLogRequest {
         thread_name: std::thread::current().name().unwrap_or("<unknown>").into(),