keep track of the door-locked state

src/brain/environment.rs

@@ -17,6 +17,7 @@ pub enum EventsResult {
 
 pub struct Environment {
     events: Receiver<Event>,
+    door_locked: bool,
 }
 
 impl Environment {
@@ -31,6 +32,7 @@ impl Environment {
                 timeout_chan.recv() => return EventsResult::Timeout,
                 events.recv() -> ev => {
                     match ev {
+                        None => return EventsResult::ShuttingDown,
                         Some(ev) => {
                             self.record_state(&ev);
                             for handler in handlers.iter_mut() {
@@ -40,7 +42,6 @@ impl Environment {
                                 }
                             }
                         }
-                        None => return EventsResult::ShuttingDown,
                     }
                 }
             }
@@ -48,7 +49,13 @@ impl Environment {
         unreachable!()
     }
 
-    fn record_state(&mut self, ev: &Event) {}
+    fn record_state(&mut self, ev: &Event) {
+        match ev {
+            &Event::DoorLocked(b) =>
+                self.door_locked = b,
+            _ => {},
+        }
+    }
 
     pub fn door_locked(&self) -> bool {
         true