feat(tasks): Skip if client has ceased polling

app.py

@@ -43,15 +43,29 @@ def calculate_eta(task_id):
     if len(total_durations):
         eta = initial_place_in_queue * mean(total_durations)
     else:
-        eta = initial_place_in_queue * 40
+        eta = initial_place_in_queue * 35
 
     return round(eta, 1)
 
 
+def next_task(task_id):
+    tasks[task_id]["completed_at"] = time()
+
+    queued_tasks = list(task for task in tasks.values() if task["status"] == "queued")
+
+    if queued_tasks:
+        print(f"{task_id} {tasks[task_id]['status']}. Task/s remaining: {len(queued_tasks)}")
+        process_task(queued_tasks[0]["task_id"])
+
+
 def process_task(task_id):
     if 'processing' in list(task['status'] for task in tasks.values()):
         return
 
+    if tasks[task_id]["last_poll"] and time() - tasks[task_id]["last_poll"] > 30:
+        tasks[task_id]["status"] = "abandoned"
+        next_task(task_id)
+
     tasks[task_id]["status"] = "processing"
     tasks[task_id]["started_at"] = time()
 
@@ -63,13 +77,7 @@ def process_task(task_id):
     else:
         tasks[task_id]["status"] = "completed"
     finally:
-        tasks[task_id]["completed_at"] = time()
-
-        queued_tasks = list(task for task in tasks.values() if task["status"] == "queued")
-
-        if queued_tasks:
-            print(f"Tasks remaining: {len(queued_tasks)}")
-            process_task(queued_tasks[0]["task_id"])
+        next_task(task_id)
 
 
 @app.head('/')
@@ -115,6 +123,7 @@ def create_task(background_tasks: BackgroundTasks, new_task: NewTask):
 def poll_task(task_id: str):
     tasks[task_id]["place_in_queue"] = get_place_in_queue(task_id)
     tasks[task_id]["eta"] = calculate_eta(task_id)
+    tasks[task_id]["last_poll"] = time()
     tasks[task_id]["poll_count"] += 1
 
     return tasks[task_id]