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timeout-decoratorを利用して自作関数にタイムアウトを設定する

Posted at

やりたいこと

自作関数でタイムアウトを設定して、時間内に終了しなければ別の処理を実行させたい
ちょっと調べたらtimeout-decoratorに出会って使い勝手がよかったので、紹介したいと思います

前提

  • python 3.5.2
  • time_decorator 0.4.0

インストール

$ pip install timeout-decorator

使い方

1. 固定値で関数にタイムアウトを実装

@timeout(5)というように値を設定すればよいだけ

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

"""
Time out test 1
"""

import time

from timeout_decorator import timeout, TimeoutError

@timeout(5)
def func():
    """func"""
    for i in range(0, 10):
        print("i :%d" % i)
        time.sleep(i)

def callback():
    """callback"""
    print("callback")

def main():
    """
    main
    """

    try:
        func()
    except TimeoutError:
        callback()

if __name__ == "__main__":
    main()

2. タイムアウト値を変数で受け取る場合

関数内関数を利用して、タイムアウト値を引数で変更できるようにしています。

#!/usr/bin/env python

"""
Timeout test
"""

import time

from timeout_decorator import timeout, TimeoutError


def run_func_with_timeout(timeout_sec, func, *args, **kargs):
    """
    run func with timeout
    """
    print("timeout sec: %d" % timeout_sec)

    @timeout(timeout_sec)
    def target(*args, **kargs):
        """target"""
        func(*args, **kargs)
    target(*args, **kargs)

def func_test(inputs):
    """
    test
    """

    print("inputs = %d" % inputs)

    for i in range(0, 100):
        print("i: %d" % i)
        time.sleep(1)

def callback():
    """callback"""
    print("callback")

def main():
    """
    main
    """

    try:
        run_func_with_timeout(func=func_test,
                              timeout_sec=5,
                              x=5)
    except TimeoutError:
        callback()

if __name__ == "__main__":
    main()
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