[mod_python] requests are blocking when using req.sendfile

Matt Barnicle mattb at wageslavery.org
Fri Sep 26 03:04:19 EDT 2008


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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