probably you're not running a recent web2py release. On Saturday, January 25, 2014 9:37:12 PM UTC+1, James Burke wrote: > > def fast_download(): > import time, os > import contenttype as c > > cache.client(time_expire=604800, quick='SVL')(lambda: 0)() > > file_id = request.args(-1) > myfile = db.file(db.file.file==file_id) > > > filename, file = db.file.file.retrieve(myfile.file) > response.headers["Content-Type"] = c.contenttype(file_id) > response.headers["Content-Disposition"] = "attachment; filename=%s" > %filename > > > stream = response.stream(file, chunk_size=64*1024, request=request) > raise HTTP(200, stream, **response.headers) > > > I tried using the above code, but results in the follow error message: > > cache.client(time_expire=604800, quick='SVL')(lambda: 0)() > > AttributeError: 'Cache' object has no attribute 'client' > > > Am I missing something? > > Cheers > > -James > > On Monday, April 15, 2013 1:21:18 AM UTC+12, Niphlod wrote: >> >> ok. So, basically the problem is that response.stream is a "special" kind >> of function. >> It raises HTTP(200, content_of_the_file) instead of returning it, and >> raising an HTTP(200) is a smart way to do it. >> Unfortunately, this means that >> def download(): >> return response.stream(....) >> >> basically doesn't return from download, it raises an exception inside >> response.stream and the execution is cutted of right in the response.stream >> function. >> >> A decorator "outside" download() doesn't work, because it doesn't have >> the chance to execute that function completely. >> Now, on the bright side, the download() function should be the only one >> behaving in this way, so the cache.client implementation shouldn't change. >> >> I'll see if we can use a "public" function just to adjust headers >> beforehand without requiring for the actual function. >> For the time being, this works ok. >> >> def download(): >> cache.client(time_expire=604800, quick='SVL')(lambda: 0)() >> """ >> allows downloading of uploaded files >> http://..../[app]/default/download/[filename] >> """ >> return response.download(request, db) >> >> basically because cache.client is coded to be a decorator, you have to >> pass it a function. >> In this case, a dummy "lambda:0" is passed. To fire the actual >> "calculations" of the cache decorator, you have to call it (and that's why >> there's an empty () at the end). The headers are then manipulated in the >> current response, so response.download pick it up where headers are already >> set, and when it returns the image, the headers are shipped with the >> response. >> >> If you have any doubts, please ask. >> >>
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