Hello
I need a Python application server with a peculiar 'callback' feature
and I would like some advice on whether uWSGI is the right tool for the
job.
The peculiar feature is that the Python application should be able to
issue back RPC calls to the calling server (some Java software under my
control) and have the RPCs replied, before returning a response to the
original WSGI request, all on the same line (tcp connection).
Here is the sequence of calls (please copy and paste it to an editor if
you are not using a fixed font):
Java Frontend Python App Server
================= =================
-----------------
BEGIN: issue HTTP
request to Python
(open or grab tcp connection)
----[WSGI or uWSGI request]---->
(some processing)
<-------[some kind of RPC]------
(Java processing)
-------[RPC return value]------>
(more processing)
<----[WSGI / uWSGI response]----
(close or release connection)
END: process HTTP
response received
-----------------
The tricky part is that the RPC call should be made to the same *thread*
that issued the original WSGI call, not to the server in general. This
tells me that the RPC and WSGI calls should be made on the same tcp
connection, with the same protocol, and that protocol should permit such
a bi-directional and nested sequence of requests and replies.
Also, after issuing the WSGI request on the channel, the Java client has
no way to know whether Python will reply with the HTTP response or with
one or more RPC calls, so the protocol must be that flexible.
I like uWSGI's wealth of features and I'm not afraid to write a client
for its binary protocol (or the subset I need) in Java, but I would like
some confirmation that this flow is actually supported by uWSGI.
Which of its features / packets would you recommend for this setup?
In case it is not possible, do you know of any generic binary protocol
that allows bi-directional nested requests? Some kind of RPC? Protocol
Buffers? I can always write my own, but I'd rather avoid re-inventing
the wheel.
-Tobia
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