On 06:58 pm, strom...@gmail.com wrote:
On Jun 3, 10:47�am, Nathan Huesken <pyt...@lonely-star.org> wrote:
Hi,
I am writing a network application which needs from time to time do
file transfer (I am writing the server as well as the client).
For simple network messages, I use pyro because it is very
comfortable.
But I suspect, that doing a file transfer is very inefficient over
pyro, am I right (the files are pretty big)?
I somehow need to ensure, that the client requesting a file transfer
is
the same client getting the file. So some sort of authentication is
needed.
What library would you use to do the file transfer?
Regards,
Nathan
I've never used Pyro, but for a fast network file transfer in Python,
I'd probably use the socket module directly, with a cache oblivious
algorithm:
http://en.wikipedia.org/wiki/Cache-oblivious_algorithm
It doesn't use sockets, it uses files, but I recently did a Python
progress meter application that uses a cache oblivious algorithm that
can get over 5 gigabits/second throughput (that's without the network
in the picture, though if it were used on 10 Gig-E with a suitable
transport it could probably do nearly that), on a nearly-modern PC
running Ubuntu with 2 cores It's at:
http://stromberg.dnsalias.org/~strombrg/gprog/ .
This seems needlessly complicated. Do you have a hard drive that can
deliver 5 gigabits/second to your application? More than likely not.
A more realistic answer is probably to use something based on HTTP.
This solves a number of real-world problems, like the exact protocol to
use over the network, and detecting network issues which cause the
transfer to fail. It also has the benefit that there's plenty of
libraries already written to help you out.
Jean-Paul
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