How to issue Python commands from an extension server handler?

JupyterLab extensions
,
1

From the web server (Python/tornado) I would like to execute some python code on the kernel.

Is that possible? So far, I can see which kernel ID are running but not sure how to issue some Python code and get some results from that kernel.

Basically I would like to do something like

PY_EXEC = """
try:
    import json
    from trame.app import AVAILABLE_SERVERS
    reply(json.dumps(list(AVAILABLE_SERVERS.keys())))
except:
   reply("[]")
"""

class RouteHandler(APIHandler):
    @tornado.web.authenticated
    def get(self):
        config = {}
        km = self.kernel_manager
        for k_id in  km.list_kernel_ids():
              response = exec_in_kernel(k_id, PY_EXEC)
              config[k_id] = json.load(response)

        self.finish(json.dumps(config))

Any pointer would be great!

Thanks,

Seb