plumber

plumber allows you to create a REST API by merely decorating your existing R source code with special comments. Take a look at an example.

# myfile.R

#* @get /mean
normalMean <- function(samples=10){
  data <- rnorm(samples)
  mean(data)
}

#* @post /sum
addTwo <- function(a, b){
  as.numeric(a) + as.numeric(b)
}

These comments allow plumber to make your R functions available as API endpoints. You can use either #* as the prefix or #', but we recommend the former since #' will collide with Roxygen.

> library(plumber)
> r <- plumb("myfile.R")  # Where 'myfile.R' is the location of the file shown above
> r$run(port=8000)

You can visit this URL using a browser or a terminal to run your R function and get the results. Here we're using curl via a Mac/Linux terminal.

$ curl "http://localhost:8000/mean"
 [-0.254]
$ curl "http://localhost:8000/mean?samples=10000"
 [-0.0038]

As you might have guessed, the request's query string parameters are forwarded to the R function as arguments (as character strings).

$ curl --data "a=4&b=3" "http://localhost:8000/sum"
 [7]

Installation

Currently plumber is not available on CRAN, so you'll need to install it from GitHub. The easiest way to do that is by using devtools.

library(devtools)
install_github("trestletech/plumber")
library(plumber)

Provenance

plumber was originally released as the rapier package and has since been renamed (7/13/2015).