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rstudio / rsconnect

Publish Shiny Applications, RMarkdown Documents, Jupyter Notebooks, Plumber APIs, and more

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Deploy shinyapps.io: Timeout but no error in logs

karchjd opened this issue · comments

commented

My shiny app (https://github.com/karchjd/lavaangui/tree/debug-shinyapp) runs perfectly locally and when I deploy it to https://www.heroku.com/ (https://lavaangui-64ec430ee663.herokuapp.com/#). When I deploy it to shinyapps.io, it deploys it successfully but visiting the webpage (https://solo-fsw.shinyapps.io/lavaangui/) leads to a timeout error:

An error has occurred
Unable to connect to worker after 60.00 seconds; startup took too long. Contact the author for more information.

Note that the app starts within a few seconds max locally and on heroku.

However, I don't get any errors in the logs:

2023-12-20T10:53:48.634361+00:00 shinyapps[10373658]: Starting R with process ID: '32'
2023-12-20T10:53:48.638720+00:00 shinyapps[10373658]: Shiny application starting ...
2023-12-20T10:53:48.642969+00:00 shinyapps[10373658]: Warning in loadSupport(appDir, renv = sharedEnv, globalrenv = NULL) :
2023-12-20T10:53:48.647881+00:00 shinyapps[10373658]:   Loading R/ subdirectory for Shiny application, but this directory appears to contain an R package. Sourcing files in R/ may cause unexpected behavior.
2023-12-20T10:53:48.652196+00:00 shinyapps[10373658]: ℹ Loading lavaangui
2023-12-20T10:53:48.656550+00:00 shinyapps[10373658]: [1] "starting server"
2023-12-20T10:53:48.660974+00:00 shinyapps[10373658]: [1] ""
2023-12-20T10:53:48.665396+00:00 shinyapps[10373658]: 
2023-12-20T10:53:48.669869+00:00 shinyapps[10373658]: Listening on http://127.0.0.1:4220

I deploy my app like this: https://github.com/karchjd/lavaangui/blob/debug-shinyapp/dev/deploy.R

commented

Why is your app starting a server? I think that's the place I'd start.

commented

shinyapps.io uses code like the following to run your application:

shiny::runApp(
    host = HOST,
    port = PORT,
    ...
)

The host, port, and a number of other runApp() parameters are determined dynamically when your application starts.

Your start_app() function is calling runApp(), which is unnecessary and becomes a recursive runApp() invocation.

Try having the app.R produce the shinyApp() result rather than starting a server.

commented

Thanks so much for the fast help!! This solved my problem.

It seems that I got confused by the multiple different ways of deploying an app and forgot that for shinyapps.io, defining the app is sufficient.

commented

Happy to help. In the future, the shinyapps.io community forum can also give advice:
https://community.rstudio.com/c/shiny/shinyappsio/24