Roger

Roger is a Go RServe client, allowing the capabilities of R to be used from Go applications.

The communication between Go and R is via TCP. It is thread safe and supports long running R operations synchronously or asynchronously (using channels).

package main

import (
	"fmt"

	"github.com/senseyeio/roger"
)

func main() {
	rClient, err := roger.NewRClient("127.0.0.1", 6311)
	if err != nil {
		fmt.Println("Failed to connect")
		return
	}

	value, err := rClient.Eval("pi")
	if err != nil {
		fmt.Println("Command failed: " + err.Error())
	} else {
		fmt.Println(value) // 3.141592653589793
	}

	helloWorld, _ := rClient.Eval("as.character('Hello World')")
	fmt.Println(helloWorld) // Hello World

	arrChan := rClient.Evaluate("Sys.sleep(5); c(1,1)")
	arrResponse := <-arrChan
	arr, _ := arrResponse.GetResultObject()
	fmt.Println(arr) // [1, 1]
}

Response Type Support

Roger currently supports the following response types from R:

• string and string arrays
• booleans and boolean arrays
• doubles and double arrays
• ints and int arrays
• complex and complex arrays
• lists
• raw byte arrays

With the use of JSON, this capability can be used to transfer any serializable object. For examples see sexp_parsing_test.go.

Assignment Support

Roger allows variables to be defined within an R session from Go. Currently the following types are supported for variable assignment:

• string and string arrays
• byte arrays
• doubles and double arrays
• ints and int arrays

For examples see assignment_test.go.

Setup

Rserve should be installed and started from R:

install.packages("Rserve")
require('Rserve')
Rserve()

More information is available on RServe's website.

If you would like to exploit the current R environment from go, start RServe using the following command:

install.packages("Rserve")
require('Rserve')
run.Rserve()

Install Roger using:

go get github.com/senseyeio/roger

Testing

To ensure the library functions correctly, the end to end functionality must be tested. This is achieved using Docker and Docker Compose. To run tests, ensure you have both Docker and Docker Compose installed, then run docker-compose build && docker-compose up -d from within the test directory. This command will build and start a docker container containing multiple RServe servers. These servers will be utilized when running go test from the project's base directory. To stop the docker container call docker-compose stop from the test directory.

Contributing

Issues, pull requests and questions are welcomed. If required, assistance can be found in the project's gitter chat room.

Pull Requests

• Fork the repository
• Make changes
• Ensure tests pass
• Raise pull request