cgo support?

[Julio-Guerra]

Proposal

I guess CGO isn't supported as it is based on compile-time code generation and low-level Go ABI things, but as I couldn't clearly find the answer, I thought it would be worth asking.

Background

Given Traefik plugins are now based on Yaegi, advanced middleware plugins such as web-app firewalls may be Go wrappers of C libraries.

Some of our users would like to have us in their Traefik proxy but, afaik, being limited to pure Go makes it impossible for now.

[mvertes]

As stated in the README, using CGO at interpreter level is not supported. It is always possible to wrap a pre-compiled package and export it to the interpreter by Use method (as it is done for the standard library), but that implies adding a new dependency to the host binary (in the plugin case, traefik).

[Julio-Guerra]

@mvertes, I'm back on this idea ^^
What about starting a side-car process having this C++ WAF running along with an API I could call from the plugin?
I wonder how could I start this side-process automatically from Traefik or the plugin (os/exec being forbidden afaik).