DHE: Python Language Server

[bmingles]

The vscode extension needs to be able to use a language server running on the server in the context of the Core+ worker.

• Extension needs to talk to language service specific to the Core+ worker the editor is running against
• There are certain global objects available to Python scripts. These should show up in intellisense
• What to do when worker is not connected?
• DHE: Workspace dependencies #105 is related and should probably be addressed via the LSP

Notes
We have a LSP implementation that can be used as a starting point:

https://github.com/deephaven-ent/iris/blob/b10dd884acd3deae810ca85d391b029ee655d95b/web/client-api/src/main/java/com/illumon/iris/ide/shared/IdeSession.java#L141

We might also consider a stop gap solution for this by providing a requirements.txt to the user to mirror their local env with the server. This would get around the need to have access to the server's language service.
Related docs:

• https://deephaven.io/enterprise/docs/development/installing-python/#deephaven-requirementstxt
• https://deephaven.io/enterprise/docs/development/installing-python/#create-a-local-python-venv

[mofojed]

Here's a way for setting up a local venv that matches a worker on the server:
https://deephaven.io/enterprise/docs/development/installing-python/#create-a-local-python-venv
I think that may be with a legacy workers, but something similar to that would be a good workaround for setting up a venv similar to your Core+ worker before completing language server, with little work.