IJupyterSessoinManager and IJupyterSession light that talks over ZMQ

[rchiodo]

Given this picture here:

Implement the new part in orange

[rchiodo]

First steps should be if this can be split or not. Once a general purpose way to talk through ZMQ is setup, might be able to split out the work further.

[rchiodo]

This will likely be useful: https://www.npmjs.com/package/jmp

[IanMatthewHuff]

Was taking notes in OneNote but figured that I should have at least put a summary in the issue as well for updates / comments.

Current plan of approach:

• The main bulk of the work here is having our own object that implements IKernel (IKernelConnection does most of what we need, but I think we need some of the additional stuff added in IKernel)
  • This object needs to have the same surface area as the parts of JupyterLab services that we currently use, then under the surface translate from JupyterLab services request -> raw message -> ZMQ connection (jmp or enchannel) -> IPython kernel -> response ZMQ message -> JupyterLab services response
• To focus on the main bit, there are a few thing that I'm specifically ignoring in the first pass
  • Starting up the kernel is being handled as a separate item, so for now ignore this. For testing fine to just start up a kernel manually and just hardcoding the connection to it
  • Our Session / SessionManager are going to need awareness of if they are connecting to a running jupyter server or our kernel connection or perhaps that bifurcation will be up a level. I'm not looking at this first pass, but instead looking at our IKernel supporting object as a single deliverable by itself, then hooking up to the overall workflow as a second pass. Ok with hacking in the new object for now for testing / developing, will probably do initial checking just exercised by tests.

[IanMatthewHuff]

Closing this off as the main RawJupyterSession work is done. I've split off a few issues for the remaining followup work as I like that better than working with a bit meta issue like this.