R Shiny post mortem analysis training

What is Shiny?

Shiny is an R package that makes it easy to build interactive web apps using the programming language R.

Shiny is a product of posit (formerly known as RStudio)-

What is "post-mortem analysis" and when to use it

"Post-mortem analysis" means

• to analyze an (R) memory dump
• stored in a file (via the package tryCatchLog)
• when an R app throws an error (or even "crashes"/stops running)
• in a new R session (= not debugging the running code!).

"Post-mortem anaylsis" ist most helpful for

• sporadic (non-reproducible) bugs (since the memory dump contains the state when the error occured)
• Debugging is not possible (e.g. on a production remote machine)

Purpose of this repo

This repo contains

• R example code and
• a presentation

to teach how to cope with errors in Shiny Apps, mainly:

• Logging
• Error-handling
• Post-mortem analysis (using tryCatchLog)

TODOs

• Document limitations of post-mortem analysis due to different R version, missing packages (not installed), different OS...
• a lot more I guess (please open an issue to request adding or modifying something)...