Inversion of control for a streaming upload provider

I need a way to proxy streaming uploads, that is to forward bytes from the client as soon as they are received, without temp files. To do that, I need to have a file-like object given to the provider for reading - as opposed to the provider giving the request server a file-like object for writing.

I am thinking something along the lines of checking for a flag in doPUT, and if the provider prefers, just give it the reference to environ["wsgi.input"] for reading.

Any thoughts? @mar10 @tomviner

[samuelfekete]

@mar10, I have made another change to use generators, and I have isolated the code that writes to the file object in the small method processData. This can be overridden, for example, to just hand over the stream to the file object, so that the provider can read from it or forward it to a networking library. https://github.com/mar10/wsgidav/pull/51/commits/ebb0e99f1ec4a1d418a8aaf47424db8e490d9fc0

[mar10]

@samuelfekete could add some lines to the docstring of StreamingFile, maybe a small example how to use it?