To make turbogears talk to a data source other than Database

[一首诗]

Hi all,

I have to make my turbogears program talk to a remote server by UDP,
which means while handling a http request in controller.py, I have to
send out an UDP package and block the thread until the response is
received.

I have little idea of how to make this happen. Maybe I could write
another thread to send and receive packages, and wake up the waiting
thread correctly.

Do u have any suggestions? Thanks a lot?

By the way, I also need to process the binary data in UDP packages, and
it's a little complicated to use struct. Is there any more convenient
packages that you may recommend?

Thanks again!

[Adam Jones]

一首诗 wrote:
> Hi all,
>
> I have to make my turbogears program talk to a remote server by UDP,
> which means while handling a http request in controller.py, I have to
> send out an UDP package and block the thread until the response is
> received.
>
> I have little idea of how to make this happen. Maybe I could write
> another thread to send and receive packages, and wake up the waiting
> thread correctly.
>
> Do u have any suggestions? Thanks a lot?

If blocking the thread is acceptable just run the UDP action in-thread.
There are alternatives, but if you don't need to process that
interaction asynchronously set up a separate module and call it
directly from the controller.

If you *do* need the UDP connection and controller method to be
independent (i.e. you have more people using this than you can spawn CP
threads for or the communication takes a long time) I would suggest
setting up a separate "server" (which could run on the same host) and
pass it a unique key that it can use to return the data. (through
POSTing to a specified controller method, for example) At that point
the server doesn't even necessarily have to be written in Python.

>
> By the way, I also need to process the binary data in UDP packages, and
> it's a little complicated to use struct. Is there any more convenient
> packages that you may recommend?
>
> Thanks again!

I'm not terribly experience there, but I have heard good things about
hachior[1] The website says it is for "binary files", but if it isn't
able to read in-memory objects I'm sure someone has found a way to fake
a file enough to make it work.

-Adam

[1] http://hachoir.org/

[一首诗]

I'm not sure how to make the UDP action in thread because I could use
only one port to received response.

But the idea of using POST method is excellent! Changing UDP action to
TCP action sovled my problem.