Add queue completion method, add Printer discovery and types

src/print_queue.py

@@ -76,7 +76,13 @@ class PrintQueue:
         """Return current queue state"""
         with self._lock:
             self.app.logger.debug("Return current queue state")
-            return [{"task_id": t.task_id, "status": t.status} for t in self._queue]
+            return [{"task_id": t.task_id, "status": t.status, "type": str(t.task_type) } for t in self._queue]
+
+    def get_queue_completed(self):
+        """Return completed queue elements"""
+        with self._lock:
+            self.app.logger.debug("Return completed queue elements")
+            return self._completed_tasks
 
     def get_status(self, task_id):
         """Get full status info for a task"""