Django：显示在每个页面上加载页面所需的时间 [英] Django: display time it took to load a page on every page
问题描述
在Django中，如何在网站的每个页面中返回加载页面（而不是日期）的时间而不使用不得不在每个views.py 中写入类似于以下代码的代码：
In Django, how can I return the time it took to load a page (not the date) in every page of the site, without having to write in every views.py a code similar to the following one?
start = time.time()
#model operations
loadingpagetime = time.time() - start
如果使用 TEMPLATE_CONTEXT_PROCESSOR 是最好的选择。
我将如何从整个页面加载时间，而不是只得到模板加载时间？
If using a TEMPLATE_CONTEXT_PROCESSOR is the best option.
How would I get the whole page loading time from there, instead of just getting the template loading time?
更新：
由于初始问题不在似乎很清楚，这里是一个方法，将是我想做什么的 Python版本。
As the initial question doesn't seem to be clear enough, here is an approach of what would be the Python version of what I want to do.
#!/usr/bin/env python
import cgitb; cgitb.enable()
import time
print 'Content-type: text/html\n\n'
start = time.time()
print '<html>'
print '<head>'
print '</head>'
print '<body>'
print '<div>HEADER</div>'
print '<div>'
print '<p>Welcome to my Django Webpage!</p>'
print '<p>Welcome to my Django Webpage!</p>'
print '<p>Welcome to my Django Webpage!</p>'
print '</div>'
time.sleep(3)
loadingtime = time.time() - start
print '<div>It took ',loadingtime,' seconds to load the page</div>'
print '</body>'
print '</html>'
推荐答案
您可以创建一个自定义的中间件进行登录。这是我如何创建一个中间件，以实现这一目的基于 http://djangosnippets.org/snippets/358/ （I
You can create a custom middleware to log this. Here is how I create a middleware to achieve this purpose base on http://djangosnippets.org/snippets/358/ (I modified the code a bit).
首先，假设您的项目有一个名称： test_project ，创建一个文件名 middlewares.py ，将其放在与 settings.py 相同的文件夹中：
Firstly, assuming your project has a name: test_project, create a file name middlewares.py, I place it in the same folder as settings.py:
from django.db import connection
from time import time
from operator import add
import re
class StatsMiddleware(object):
def process_view(self, request, view_func, view_args, view_kwargs):
'''
In your base template, put this:
<div id="stats">
<!-- STATS: Total: %(total_time).2fs Python: %(python_time).2fs DB: %(db_time).2fs Queries: %(db_queries)d ENDSTATS -->
</div>
'''
# Uncomment the following if you want to get stats on DEBUG=True only
#if not settings.DEBUG:
# return None
# get number of db queries before we do anything
n = len(connection.queries)
# time the view
start = time()
response = view_func(request, *view_args, **view_kwargs)
total_time = time() - start
# compute the db time for the queries just run
db_queries = len(connection.queries) - n
if db_queries:
db_time = reduce(add, [float(q['time'])
for q in connection.queries[n:]])
else:
db_time = 0.0
# and backout python time
python_time = total_time - db_time
stats = {
'total_time': total_time,
'python_time': python_time,
'db_time': db_time,
'db_queries': db_queries,
}
# replace the comment if found
if response and response.content:
s = response.content
regexp = re.compile(r'(?P<cmt><!--\s*STATS:(?P<fmt>.*?)ENDSTATS\s*-->)')
match = regexp.search(s)
if match:
s = (s[:match.start('cmt')] +
match.group('fmt') % stats +
s[match.end('cmt'):])
response.content = s
return response
其次，修改 settings.py 添加您的中间件：
Secondly, modify settings.py to add your middleware:
MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
# ... your existing middlewares ...
# your custom middleware here
'test_project.middlewares.StatsMiddleware',
)
注意：如上所述，您必须添加到中间件类的完整路径，格式为：
Note: you have to add the full path to your middleware class like above, the format is:
<project_name>.<middleware_file_name>.<middleware_class_name>
第二个注释是我将这个中间件添加到列表的末尾，因为我只想登录模板加载时间单独。如果您要记录模板+所有中间件的加载时间，请将其放在 MIDDLEWARE_CLASSES 列表开始（$ @Symmitchry）中。
A second note is I added this middleware to the end of the list because I just want to log the template load time alone. If you want to log the load time of templates + all middlewares, please put it in the beginning of MIDDLEWARE_CLASSES list (credits to @Symmitchry).
返回主题，下一步是修改您的 base.html 或您要加载日志的任何页面，添加以下内容：
Back to the main topic, the next step is to modify your base.html or whatever pages you want to log load time, add this:
<div id="stats">
<!-- STATS: Total: %(total_time).2fs Python: %(python_time).2fs DB: %(db_time).2fs Queries: %(db_queries)d ENDSTATS -->
</div>
注意：您可以命名< div id =stats> ; ，并使用CSS，但你想要的，但不要更改评论<！ - STATS：.... - > 。如果要更改它，请确保您根据创建的 middlewares.py 中的正则表达式模式进行测试。
Note: you can name the <div id="stats"> and use CSS for that div however you want, but DON'T change the comment <!-- STATS: .... -->. If you want to change it, be sure that you test it against the regex pattern in the created middlewares.py.
Voila，享受统计资料。
Voila, enjoy the statistics.
编辑：
使用CBV（基于类的视图）很多，你可能遇到错误 ContentNotRenderedError 与上面的解决方案。没有恐惧，这里是在 middlewares.py 中的修复：
For those who use CBVs (Class Based Views) a lot, you might have encountered the error ContentNotRenderedError with above solution. Have no fear, here is the fix in middlewares.py:
# replace the comment if found
if response:
try:
# detects TemplateResponse which are not yet rendered
if response.is_rendered:
rendered_content = response.content
else:
rendered_content = response.rendered_content
except AttributeError: # django < 1.5
rendered_content = response.content
if rendered_content:
s = rendered_content
regexp = re.compile(
r'(?P<cmt><!--\s*STATS:(?P<fmt>.*?)ENDSTATS\s*-->)'
)
match = regexp.search(s)
if match:
s = (s[:match.start('cmt')] +
match.group('fmt') % stats +
s[match.end('cmt'):])
response.content = s
return response
我得到它与Django 1.6.x的工作，如果您有其他版本的Django有问题，请在评论部分ping我。
I got it working with Django 1.6.x, if you have problem with other version of Django, please ping me in comment section.
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