How to debug RestRserve, browser()?

[dereckmezquita]

Hello I'm getting started with RestRserve. I'm looking to understand how to debug my application? I typically use browser() in my R code, but when I use it with RestRserve this doesn't work.

I see the warnings about running in interactive mode and I know browser() is for interactive mode only so what is the method for debugging?

I tried this which gives this error:

main.R

#!/usr/bin/env Rscript
box::use(RestRserve)

app <- RestRserve$Application$new()

app$add_get("/echo", function(.req, .res) {
    browser() # breaks the app in interactive mode
    .res$set_body(list(paste0("The message is: '", .req$get_param_query("msg"), "'")))
    .res$set_content_type("application/json")
})

backend <- RestRserve$BackendRserve$new()
backend$start(app, http_port = 8080)

It runs but when I visit the end point I get this error:

{"timestamp":"2023-10-29 11:34:34.305171","level":"INFO","name":"Application","pid":58372,"msg":"","context":{"http_port":8080,"endpoints":{"HEAD":"/echo","GET":"/echo"}}}
-- running Rserve in this R session (pid=58372), 2 server(s) --
(This session will block until Rserve is shut down)
Called from: FUN(request, response)
Warning message:
In backend$start(app, http_port = 8080) :
  Starting RestRserve app from interactive session might cause unstable work of the service.
Please consider to start the application from a shell in non-interactive mode:

> Rscript your_app.R
Called from: FUN(request, response)
Warning message:
In backend$start(app, http_port = 8080) :
  Starting RestRserve app from interactive session might cause unstable work of the service.
Please consider to start the application from a shell in non-interactive mode:

> Rscript your_app.R
Called from: FUN(request, response)
Warning message:
In backend$start(app, http_port = 8080) :
  Starting RestRserve app from interactive session might cause unstable work of the service.
Please consider to start the application from a shell in non-interactive mode:

> Rscript your_app.R

[dselivanov]

I'm sorry - I haven't seen activity in Discussions. For whatever reason I'm not getting any notifications from github.
To debug I suggest to not start application with backend$start() but use app$process_request() - see here.