Check for dependencies conflict before deleting a device

central_backend/src/devices/devices_list.rs

@@ -23,6 +23,8 @@ pub enum DevicesListError {
     DeviceNotFound,
     #[error("Requested device is not validated")]
     DeviceNotValidated,
+    #[error("Failed to delete device: {0}")]
+    DeleteDeviceFailed(&'static str),
     #[error("Failed to update relay configuration: {0}")]
     UpdateRelayFailed(&'static str),
     #[error("Failed to delete relay: {0}")]
@@ -178,6 +180,19 @@ impl DevicesList {
 
     /// Delete a device
     pub fn delete(&mut self, id: &DeviceId) -> anyhow::Result<()> {
+        // Check for conflicts
+        let device = self
+            .get_single(id)
+            .ok_or(DevicesListError::DeleteDeviceFailed("Device not found!"))?;
+        for r in &device.relays {
+            if !self.relay_get_direct_dependencies(r.id).is_empty() {
+                return Err(DevicesListError::DeleteDeviceFailed(
+                    "A relay of this device is required by another relay!",
+                )
+                .into());
+            }
+        }
+
         let crt_path = AppConfig::get().device_cert_path(id);
         if crt_path.is_file() {
             let cert = self.get_cert(id)?;