more errors refactoring

src/errors.rs

@@ -5,7 +5,8 @@ use redis::RedisError;
 #[derive(Debug)]
 pub enum LJError {
     ConfigFileMissing,
-    RedisConnect(RedisError)
+    RedisConnect(RedisError),
+    HeliosDeviceMissing
 }
 
 impl fmt::Display for LJError {
@@ -19,6 +20,9 @@ impl fmt::Display for LJError {
 	    },
 	    RedisConnect(err) => {
 		write!(f, "unable to connect to redis server: {err}")
+	    },
+	    HeliosDeviceMissing => {
+		write!(f, "helios device not found")
 	    }
 	}
     }
@@ -29,8 +33,8 @@ impl Error for LJError {
 	use LJError::*;
 
 	match self {
-	    ConfigFileMissing => None,
-	    RedisConnect(err) => Some(err)
+	    RedisConnect(err) => Some(err),
+	    _ => None
 	}
     }
 }

src/main.rs

@@ -6,8 +6,9 @@ mod redis_ctrl;
 mod conf;
 mod errors;
 
-use helios_dac::NativeHeliosDacController;
 use helios_dac::{
+    NativeHeliosDacController,
+    NativeHeliosDac,
     // Coordinate,
     Color,
     DeviceStatus,
@@ -36,31 +37,15 @@ fn run_all() -> Result<(), Box<dyn std::error::Error>> {
 	return Err(Box::new(LJError::ConfigFileMissing));
     };    
     let config = load_config(&filename)?;    
-    let rs = RedisCtrl::new()?;
+    let mut rs = RedisCtrl::new()?;
     
-    run_dac(config, rs)
-}
-
-fn run_dac(
-    config: Conf,
-    mut rs: RedisCtrl
-) -> Result<(), Box<dyn std::error::Error>> {
     let running = Arc::new(AtomicBool::new(true));
     let r = running.clone();
-
     ctrlc::set_handler(move || {
         r.store(false, Ordering::SeqCst);
     })?;
 
-    let controller = NativeHeliosDacController::new()?;
-    let devices = controller.list_devices()?;
-
-    let Some(device) = devices.into_iter().next() else {
-	println!("Unable to find an helios device");
-	return Ok(());
-    };
-        
-    let mut device = device.open()?;
+    let mut device = get_helios_device()?;
     
     while running.load(Ordering::SeqCst) {
 	let order = rs.get_order(config.laser_id)?;
@@ -81,6 +66,16 @@ fn run_dac(
     Ok(())
 }
 
+fn get_helios_device() -> Result<NativeHeliosDac, Box<dyn std::error::Error>> {
+    let controller = NativeHeliosDacController::new()?;
+    let devices = controller.list_devices()?;
+    let Some(device) = devices.into_iter().next() else {
+	return Err(Box::new(LJError::HeliosDeviceMissing));
+    };
+    let device = device.open()?;
+    Ok(device)
+}
+
 fn get_next_frame(
     config: &Conf,
     speed: u32,