[mod_python] requests are blocking when using req.sendfile

Matt Barnicle mattb at wageslavery.org
Fri Sep 26 03:46:58 EDT 2008


nope  :-(

> 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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