UI: Handling global flow variables

[reelmatt]

KNIME

In KNIME, global flow variables are defined per workflow from a dropdown menu

which pops up a list of all currently defined variables, with options to add, edit, or remove any global variables.

PyWorkflow

Existing endpoints for global variables:

• GET /workflow/globals: Retrieves a list of defined global variables
• POST /node/: define new global variables, including a is_global: true key: value pair in the body of the request
• POST/DELETE /node/global/<node_id>/: updated/delete global variables

In terms of UI, one suggestion for how to implement this is a new section somewhere in the workspace, displaying the info retrieved from /workflow/globals. A + button could trigger the POST request, appending the is_global attribute (whereas Nodes dragged from the list would not include is_global or POST it as false).