R Shiny Example Web App
This is an example web applet that demonstrates how to build and run an R Shiny application on DNAnexus.
Inside the
dxapp.json, you would add "httpsApp": {"ports":[443], "shared_access": "VIEW"} to tell the worker to expose this port.R Shiny needs two scripts,
server.R and ui.R, which should be under resources/home/dnanexus/my_app/. When a job starts based on this applet, the resources directory is copied onto the worker, and since the ~/ path on the worker is /home/dnanexus, that means you now have ~/my_app with those two scripts inside.From the main applet script
code.sh, we simply start shiny pointing to ~/my_app repo, serving its mini-application on port 443.main() {
R -e "shiny::runApp('~/my_app', host='0.0.0.0', port=443)"
}
Note that for all web apps, if everything is running smoothly and no errors are encountered (the ideal case), the line of code that starts the server will keep it running forever. The applet stops only when it is terminated. This also means that any lines of code after the server starts will not be executed.
To make your own applet with R Shiny, simply copy the source code from this example and modify
server.R and ui.R inside resources/home/dnanexus/my_app.To build the asset, run the
dx build_asset command and pass shiny-asset, i.e. the name of the directory holding dxasset.json:dx build_asset shiny-asset
This will output a record ID
record-xxxx that you can then put into the applet’s dxapp.json in place of the existing one:"runSpec": {
...
"assetDepends": [
{
"id": "record-xxxx
}
]
...
}
Now build and run the applet itself:
dx build -f dash-web-app
dx run dash-web-app
Once it spins up, you can go to that job’s designated URL based on its job ID, https://job-xxxx.dnanexus.cloud/, to see the result.
Last modified 1yr ago