django-scaler 0.2

安装

1. 在 Python 路径中安装或添加django-scaler 。

2. 将缩放器添加到您的INSTALLED_APPS设置。

3. 将scaler.middleware.ScalerMiddleware添加到MIDDLEWARE_CLASSES设置的顶部。

4. 添加 (r'^scaler/', include('scaler.urls')) 到 urlpatterns。

概述

由于各种原因，服务器有时可能会过载。当这种情况发生时，您不希望昂贵的请求破坏您的整个站点。当服务器处于负载状态时，站点必须将昂贵的请求重定向到“服务器繁忙”页面，然后在负载下降到足够多时自动删除重定向。

django-scaler以两种方式解决了这种情况。首先，它知道自己重定向哪些请求。其次，可以指示它重定向N个最昂贵的请求。它将响应时间数据存储在内存缓存中，使其能够做出这些决定。

用法

从test_settings.py粘贴：

DJANGO_SCALER = {
    'server_busy_url_name': 'server-busy',

    # How many response times to consider for an URL. A small value means slow
    # response times are quickly acted upon, but it may be overly aggressive.
    # A large value means an URL must be slow for a number of requests before
    # it is acted upon. The default is 100.
    'trend_size': 10,

    # How much slower than average the trend must be before redirection kicks
    # in. The default is 4.0.
    'slow_threshold': 2.0,

    # How many seconds to keep redirecting an URL before serving normally. The
    # default is 60.
    'redirect_for': 10,

    # A function that returns how many of the slowest URLs must be redirected.
    # Depending on the site, data and load on the server this may be a large
    # number. This allows external processes to instruct the middleware to
    # redirect. The default is 0.
    'redirect_n_slowest_function': lambda: 0,

    # A function that returns what percentage of the slowest URLs must be
    # redirected. Depending on the site, data and load on the server this may
    # approach 100. The default is 0.
    'redirect_percentage_slowest_function': lambda: 0,

    # A function that returns a list of regexes. URLs matching the regexes are
    # redirected. Each regex is a simple string. Do not prefix with r''. The
    # default is an empty list.
    'redirect_regexes_function': lambda: [],
}

0.2

1. 用于显式重定向的正则表达式 URL 匹配。

2. 最慢显式重定向的百分比。

0.1

1. 第一次发布。