#
# Copyright 2012 Quantopian, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import os
from signal import signal, SIGHUP, SIGINT
import time
from types import FrameType
import unittest

from zipline.utils.delayed_signals import delayed_signals


class DelayedSignals(unittest.TestCase):
    def handler(self, signum, frame):
        print "Got signal " + str(signum)
        self.got[signum] = time.time()
        self.assertTrue(isinstance(frame, FrameType))

    def setUp(self):
        signal(SIGHUP, self.handler)
        signal(SIGINT, self.handler)

    def reset(self):
        self.got = {}

    def test_delayed_signals(self):
        self.reset()
        with delayed_signals([SIGHUP]):
            os.kill(os.getpid(), SIGHUP)
            time.sleep(2)
        self.assertTrue(self.got[SIGHUP])
        self.assertTrue(time.time() - self.got[SIGHUP] < 2)

    def test_immediate_signals(self):
        self.reset()
        os.kill(os.getpid(), SIGHUP)
        time.sleep(2)
        self.assertTrue(self.got[SIGHUP])
        self.assertTrue(time.time() - self.got[SIGHUP] > 1)

    def test_multiple_signals(self):
        self.reset()
        with delayed_signals([SIGHUP, SIGINT]):
            os.kill(os.getpid(), SIGINT)
        self.assertFalse(SIGHUP in self.got)
        self.assertTrue(SIGINT in self.got)

    @delayed_signals([SIGHUP])
    def kill_and_sleep(self):
        os.kill(os.getpid(), SIGHUP)
        time.sleep(2)

    def test_decorator(self):
        self.reset()
        self.kill_and_sleep()
        self.assertTrue(SIGHUP in self.got)
        self.assertTrue(time.time() - self.got[SIGHUP] < 2)