publishing Shiny app with gganimate library

shiny
1

I'm trying to deploy a shiny app with a gganimate function for an animated plot made with user input. But when deploying to the shinyapps.io server i get an error. It seems that the gifski package depends on Rust/ a rust compiler being installed. Is there a way around this?

error from deploy tab:

Preparing to deploy application...DONE
Uploading bundle for application: 597672...DONE
Deploying bundle: 1730667 for application: 597672 ...
Waiting for task: 569219611
  building: Parsing manifest
  building: Building image: 1787246
  building: Building package: gifski
################################ Begin Task Log ################################ 
[2018-11-30T07:22:55.321463131+0000] Installing R package: withr (2.1.2)
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *binary* package ‘withr’ ...
* DONE (withr)
[2018-11-30T07:22:55.525073539+0000] Installing R package: crayon (1.3.4)
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *binary* package ‘crayon’ ...
* DONE (crayon)
[2018-11-30T07:22:55.741485066+0000] Installing R package: viridisLite (0.2.0)
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *binary* package ‘viridisLite’ ...
* DONE (viridisLite)
[2018-11-30T07:22:55.934813003+0000] Installing R package: xtable (1.8-2)
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *binary* package ‘xtable’ ...
* DONE (xtable)
[2018-11-30T07:22:56.163711038+0000] Installing R package: magrittr (1.5)
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *binary* package ‘magrittr’ ...
* DONE (magrittr)
[2018-11-30T07:22:56.361934145+0000] Installing R package: sourcetools (0.1.7)
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *binary* package ‘sourcetools’ ...
* DONE (sourcetools)
[2018-11-30T07:22:56.599020812+0000] Installing R package: labeling (0.3)
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *binary* package ‘labeling’ ...
* DONE (labeling)
[2018-11-30T07:22:56.783184304+0000] Installing R package: rlang (0.2.2)
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *binary* package ‘rlang’ ...
* DONE (rlang)
[2018-11-30T07:22:57.014687325+0000] Installing R package: stringi (1.1.7)
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *binary* package ‘stringi’ ...
* DONE (stringi)
[2018-11-30T07:22:57.379688223+0000] Building R package: gifski (0.8.6)
/mnt/packages/build /mnt
* installing to library ‘/opt/R/3.5.0/lib/R/library’
* installing *source* package ‘gifski’ ...
** package ‘gifski’ successfully unpacked and MD5 sums checked
------------------ RUST COMPILER NOT FOUND --------------------

Cargo was not found on the PATH. Please install cargo / rustc:

 - yum install cargo         (Fedora/CentOS)
 - apt-get install cargo     (Debian/Ubuntu)
 - brew install rustc        (MacOS)

Alternatively install Rust from: <https://www.rust-lang.org>

---------------------------------------------------------------

ERROR: configuration failed for package ‘gifski’
* removing ‘/opt/R/3.5.0/lib/R/library/gifski’################################# End Task Log ################################# 
Error: Unhandled Exception: Child Task 569219612 failed: Error building image: Error building gifski (0.8.6). Build exited with non-zero status: 1
Execution halted

example in shiny with gganimate plot:

library(gapminder)
library(ggplot2)
library(shiny)
library(gganimate)
theme_set(theme_bw())

ui <- basicPage(
  imageOutput("plot1"))

server <- function(input, output) {
  output$plot1 <- renderImage({
    # A temp file to save the output.
    # This file will be removed later by renderImage
    outfile <- tempfile(fileext='.gif')
    
    # now make the animation
    p = ggplot(gapminder, aes(gdpPercap, lifeExp, size = pop, 
                              color = continent)) + geom_point() + scale_x_log10() +
      transition_time(year) # New
    
    anim_save("outfile.gif", animate(p)) # New
    
    # Return a list containing the filename
    list(src = "outfile.gif",
         contentType = 'image/gif'
         # width = 400,
         # height = 300,
         # alt = "This is alternate text"
    )}, deleteFile = TRUE)}

shinyApp(ui, server)
2

So the issue here is that gifski (which is used by gganimate for gif-generation) is an R wrapper around a Rust library, which, it seems from this error message, is not available (the Rust compiler, and, I assume, the gifski library, since it needs a Rust compiler).

Someone else will hopefully be able to chime in as to whether or not it's possible to use on shinyapps.io, but I figured it was worth breaking down the origin of the error.

3 Likes
3

See this earlier post.

Additionally, for shinyapps.io (as opposed to rstudio.cloud), the documentation covers systems packages needed by R packages and the shinyapps-package-dependencies GitHub repository.

2 Likes
4

Thanks for the replies. I'll look into it tomorrow.

5

cargo is now available and gifski should be able to be installed.

6

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