Inter and Intra Snap communication

[Sergio Schvezov]

On Thu, 23 Mar 2017 17:36:32 +0000, Jenny Murphy wrote:
> Hi,
>  I currently have a java application running in a snap. As part of some
> added functionality my java application will need to communicate with a C
> program executable. We are weighing up the options of how this would work.
> The probably obvious way is to build a new snap which contains the C
> program executable. Then we need some way of inter snap communication.
>
> So my first question is what is recommend for INTER snap communication, how
> is it supposed to work?

Some form of stable IPC would provide the best robustness. There are alternatives using the content interface but that provides a level of coupling you might not want.
Either of these might need an interface.

> Alternatively could one snap contain two binaries? In this way could
> traditional linux inter process communication methods be used? This is my
> second question.

Yes, there are many cases for this already. A good example is lxd, it bundles the lxc client and the lxd daemon.
You can start this way and if your C application becomes a shared resource among many other snaps you can consider moving over to a two-snap model with some form of IPC and an interface.

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