api/resources/root.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from threading import Lock

import falcon
from engine import evaluate_solution


class RootResource:
    def __init__(self):
        self.main_lock = Lock()
        self.task_locks = {}

    def on_post(self, request, response):
        payload = request.media

        bad_request = ('task_id' not in payload or 'solution' not in payload)
        if bad_request:
            response.status = falcon.HTTP_400
            response.media = {
                'error': 'task_id or solution are missing',
            }
            return

        task_id = payload['task_id']
        solution = payload['solution']

        with self.main_lock:
            if task_id not in self.task_locks:
                self.task_locks[task_id] = Lock()

        with self.task_locks[task_id]:
            passed = evaluate_solution(task_id, solution)

        response.media = {'passed': passed}