Can we dynamically update the language server settings?

[avneeshn]

Context

We are developing an extension depending on jupyterlab-lsp's autocompletion functionality. We are using joe-re/sql-language-server. We want to be able to dynamically update the Language Server Protocol settings.

Description

sql-language-server requires settings of the following format

"sql-language-server": {
            "priority": 50,
            "serverSettings": {
                "sqlLanguageServer.connections": [
                    {
                        "name": "my_local_config",
                        "adapter": "json",
                        "filename": "/home/my-user/sql-schema.json",
                        "projectPaths": [
                            "."
                        ],
                        "ssh": null
                    }
                ]
            }
        }

As per my understanding, this is accessible via @jupyter-lsp/jupyterlab-lsp plugin. We want to be able to dynamically update "sqlLanguageServer.connections" to add more connection objects through our JupyterLab extension. Is there any way to do that?

[krassowski]

If I am not mistaken JupyterLab extensions are capable of changing settings of other extensions. This goes like:

const extension: JupyterFrontEndPlugin<void> = {
  id: MY_PLUGIN_ID,
  autoStart: true,
  requires: [ISettingRegistry],
  activate: (app: JupyterFrontEnd, settingsRegistry: ISettingRegistry) => {
    const settings = settingsRegistry.load(ANOTHER_PLUGIN_ID);
    settings.set('setting', 'value');
  }
}

see https://github.com/jupyterlab/extension-examples/tree/main/settings.

In this case, that would be:

const settings = settingsRegistry.load('@jupyter-lsp/jupyterlab-lsp:plugin');
const current = settings.get('language_servers').user; // you may want to extract default connections (if any using `.composite`) but take the rest of settings from `.user` to polluting user settings with defaults
current['sql-language-server']['serverSettings']['sqlLanguageServer.connections'] = [MY_CONNECTION];
settings.set('language_servers', current);

Now, this is not guaranteed to work for jupyterlab-lsp - there may be some code path in how we handle the settings which breaks it. If that is the case, feel welcome to point it out/open a PR. Please let me know if this turned out to be a fruitful approach.

[krassowski]

I assume this helped :) Closing as answered.

[avneeshn]

It did help. Thank you :)