Hi all,
Some colleagues and I are interested in using the Ryu controller together
with a program of our own to control and monitor network components. To
this extend, it is necessary to set up some form of communication between
the programs. For that, we want to use the ZeroMQ framework (
http://zguide.zeromq.org/page:all) that allows you to set up sockets
between different components and handles the sending and receiving of
messages. The idea is to make our own app at the Ryu side that listens and
transmits messages to ZMQ and handles interaction with virtual switches in
the network. However, we ran into issues when implementing the
communication part in our Ryu app.
We managed to made the app transmit messages by spawning a new hub with a
function that contains a while loop and every second will transmit
something. This works fine. However, the other way around won’t work. Upon
initialization of the ZeroMQ communication elements (in the constructor of
our app) all functionality blocks. In other words, opening the
communication socket causes blocking of all other hubs/processes within
Ryu. We have tried, without success, solving this in different manners, by
using different communication models (e.g., pub-sub), threads, the Ryu hub
class, the multiprocessing framework of Python, etc. .
We have no idea what causes this blocking behavior and were wondering if
somebody within the community would have an idea. We checked out the
implementation of the Ryu hub class and noticed that it uses underneath
eventlets/greenlets, but are not sure if the interaction with that might
cause the problem.
We would appreciate any comments or feedback.
Thanks in advance and best regards!
Tom
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