[mod_python] requests are blocking when using req.sendfile

Graham Dumpleton graham.dumpleton at gmail.com
Fri Sep 26 02:43:30 EDT 2008


One last thing to add then. If this doesn't work, I'll have to just
try it myself. :-)

  req.handler = 'default-handler'

Graham

2008/9/26 Matt Barnicle <mattb at wageslavery.org>:
> ok, that worked..  but unfortunately the blocking issue is still
> happening.  i've verified that the download controller is returning
> apache.DECLINED and the file downloads ok.
>
> - [email protected]
>
>> Try adding:
>>
>>   req.path_info = ''
>>
>> Graham
>>
>> 2008/9/26 Matt Barnicle <mattb at wageslavery.org>:
>>>> 2008/9/25 Matt Barnicle <mattb at wageslavery.org>:
>>>>>> 2008/9/24 Matt Barnicle <mattb at wageslavery.org>:
>>>>>>>> Are you setting a content length on the response before
>>>>>>>> calling
>>>>>>>> req.sendfile()?
>>>>>>>>
>>>>>>>> How many concurrent requests for these files are you
>>>>>>>> receiving
>>> and
>>>>>>>> how long does it take to download a file?
>>>>>>>>
>>>>>>>> Graham
>>>>>>>
>>>>>>> yes, i believe so..  now that you mention it, i haven't
>>>>>>> verified
>>>>>>> the file size from the code below, i will do that to be sure.
>>> here
>>>>>>> is the code:
>>>>>>>
>>>>>>> file_path = self.conf.run.app_folder + 'public' +
>>>>>>> download.path
>>>>>>> file_stat = os.stat(file_path)
>>>>>>> file_size = str(file_stat.st_size)
>>>>>>>
>>>>>>> self.req.headers_out['Content-Length'] = file_size
>>>>>>> self.req.headers_out['Content-Disposition'] = 'attachment;
>>>>>>> filename=%s' % os.path.basename(file_path)
>>>>>>>
>>>>>>> bytes_sent = self.req.sendfile(file_path)
>>>>>>
>>>>>> BTW, now that you are using mod_python 3.3.1, instead of using
>>>>>> req.sendfile(), you could possibly delegate serving of the
>>> static file
>>>>>> back to Apache. From memory this can be done using:
>>>>>>
>>>>>>   req.filename = self.conf.run.app_folder + 'public' +
>>>>>> download.path
>>>>>>   req.finfo = apache.stat(req.filename, apache.APR_FINFO_MIN)
>>>>>>   return apache.DECLINED
>>>>>>
>>>>>> By returning apache.DECLINED you say mod_python handler will
>>>>>> not
>>>>>> actually handle it, and by having updated req.filename and
>>>>>> req.fileinfo updated to new file, when it falls through to
>>>>>> default-handler it should serve it as static file.
>>>>>>
>>>>>> Doing it this way should bypass prior Apache access control
>>>>>> checks.
>>>>>> Thus file doesn't need to be in Apache document tree or
>>>>>> anywhere
>>> else
>>>>>> that is accessible.
>>>>>>
>>>>>> I believe doing it this way also has benefit that Apache will
>>>>>> automatically set various headers that you probably wouldn't
>>>>>> be.
>>>>>>
>>>>>> Please let us know if this alternate method works.
>>>>>>
>>>>>> Graham
>>>>> i tried the following but it doesn't seem to do what i want:
>>>>>
>>>>> DocumentRoot /var/www/my/application/public
>>>>> <Directory /var/www/my/application/public>
>>>>>  AddHandler python-program .py
>>>>>  PythonHandler myhandler
>>>>> </Directory>
>>>>
>>>> Use SetHandler instead of AddHandler.
>>>>
>>>>   DocumentRoot /var/www/my/application/public
>>>>   <Directory /var/www/my/application/public>
>>>>    SetHandler python-program
>>>>    PythonHandler myhandler
>>>>   </Directory>
>>>>
>>>> Graham
>>>
>>> ok, getting closer..  now i get a 404 error in the browser saying
>>> 'The requested URL /download/file/3 was not found on this server.'
>>> and in the apache logs:
>>>
>>> File does not exist:
>>> /var/www/application/public/downloads/music/music.zip/file/3
>>>
>>> so it looks like it's taking the last part of the URI and
>>> appending
>>> it to the physical filename and looking for that...  the request
>>> URI
>>> is 'http://example.com/download/file/3'.  the 'download'
>>> controller
>>> is what manages the music downloads.
>>>
>>> - [email protected]
>>>
>>>
>>
>
>
>


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