reactlog (version 1.1.1)

reactlog_render: Reactive Log Visualizer

Description

Provides an interactive browser-based tool for visualizing reactive dependencies and execution in your application.

Usage

reactlog_render(log, session_token = NULL, time = TRUE)
reactlog_show(log, time = TRUE, ...)

Arguments

log

Log produced by shiny to be processed

session_token

token to be used to subset which session is displayed. Defaults to all sessions.

time

A boolean that specifies whether or not to display the time that each reactive takes to calculate a result.

...

Future parameter expansion. Currently ignored

Details

To use the reactive log visualizer, start with a fresh R session and run the command reactlog_enable(); then launch your application in the usual way (e.g. using shiny::runApp()). At any time you can hit

Ctrl+F3

(or for Mac users,

Cmd+F3

) in your web browser to launch the reactive log visualization.

The reactive log visualization only includes reactive activity up until the time the report was loaded. If you want to see more recent activity, refresh the browser.

Note that Shiny does not distinguish between reactive dependencies that "belong" to one Shiny user session versus another, so the visualization will include all reactive activity that has taken place in the process, not just for a particular application or session.

As an alternative to pressing

Ctrl/Cmd+F3

--for example, if you are using reactives outside of the context of a Shiny application--you can run the shiny::reactlogShow() function, which will generate the reactive log visualization as a static HTML file and launch it in your default browser. In this case, refreshing your browser will not load new activity into the report; you will need to call shiny::reactlogShow() explicitly.

For security and performance reasons, do not enable the reactlog in production environments. When the option is enabled, it's possible for any user of your app to see at least some of the source code of your reactive expressions and observers.

See Also

shiny::reactlogShow() and reactlog_enable()

Examples

if (FALSE) {
library(shiny)
library(reactlog)

# tell shiny to log reactivity
reactlog_enable()

# run a shiny app
app <- system.file("examples/01_hello", package = "shiny")
runApp(app)

# once app has closed, display reactlog
shiny::reactlogShow()
}