I don't like your implementation, you should cache generated images and
let them be downloaded as static content.
For my site I implemented helper function for template. It accepts
image database object (with original filename) and size as params, then
it checks if specific size was already generated, if not — then it
generates thumbnail of needed size, saves it into static folder, and
then returns url to the image, which is then served from static folder.
As for file streaming, I had a case where I need to forbid access to
some files and so the cannot be put into static folder. To stream file
the i used generator which is supported in webpy. (I use
web.auto_application for url mapping):
class DownloadFile(app.page):
path="/(users|tenders)/(\d+)/files/(\d+)"
def GET(self, obj_type, obj_id, file_id):
obj = db.select(obj_type, vars=locals(), where="id=$obj_id", limit=1)[0]
return self.get(obj, obj_type, obj_id, file_id)
@file_download_access
def get(self, obj, obj_type, obj_id, file_id):
doc = db.select("files", locals(), where="id=$file_id and
obj_type=$obj_type and obj_id=$obj_id", limit=1)[0]
web.header("Content-Disposition", "attachment; filename=%s" %
doc.filename)
web.header("Content-Type", doc.filetype)
web.header('Transfer-Encoding','chunked')
f = open(os.path.join(config.upload_dir, doc.path, doc.filename), 'rb')
while 1:
buf = f.read(1024 * 8)
if not buf:
break
yield buf
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