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I have a shiny application that collects some parameters from users, which will then be used to run a simulation, which takes a long time ~ 1-3 days. So, I want the ability to tell the user to check back when the simulation is solved, as well as provide the capability to submit more input scenarios. So I want to spawn a subprocess to perform the simulation in the background, while my shiny app runs.
I tried the package 'subprocess' and 'processx', which allows one to spawn external processes and interact with them. However, I want the ability to run an entire R script with the spawned process. i.e. run source('simulation_script.R'). Also, I do not care if I am not able to share any data with my parent shiny app. I read inputs from files and write outputs to files, which can then be shown to the shiny app user. Any pointers to achieve this would be helpful?