Creating API's with R and plumber

•

4 likes•4,181 views

Slides from my recent talk at the LondonR user group (http://www.londonr.org) on creating API's with R and the 'plumber' package

Technology

Mark Sellors - Technical Architect
msellors@mango-solutions.com
APIs with R and plumber
Mark Sellors - Mango Solutions

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Me
• Technical Architect
• Data Engineering
• DataOps
• Analytic Maturity
• Automation
• Industrialisation

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Agenda
• API’s
• Introducing plumber
• How it works
• A simple case study
• Caveats
• Summary

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Data Science + API’s
are Changing the World

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Introducing plumber
http://plumber.trestletech.com

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Example - simple function
> adder <- function(a, b){
+ a + b
+ }
> adder(4, 3)
[1] 7

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Example - add plumber
#* @get /adder
> adder <- function(a, b){
+ as.numeric(a) + as.numeric(b)
+ }

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Example - running with plumber
> library(plumber)
> r <- plumb("my_api_file.R")
> r$run(port=8000)

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Example - Accessing the API
# curl http://localhost:8000/adder?a=4&b=3

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Demo 1 - Simple API

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Example - serving graphs

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Demo 2 - Tick API

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Why? What’s the point?

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Example - Shiny App

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Demo 3 - Currency Converter

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Moving beyond the shiny app
• split the application up
• turn the function into a general purpose
service
• refactor the shiny app to use the API

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Demo 4 - Currency API

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Caveats

Mark Sellors - Technical Architect
msellors@mango-solutions.com
When not to use plumber
• Shiny is a better for many users/uses
• It’s predominantly for API’s, not a full web
stack solution

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Extra things to consider...
• Security
• input sanitisation
• logging
• monitoring
• load balancing and state
• blocking

Mark Sellors - Technical Architect
msellors@mango-solutions.com
The Competition
RServe
OpenCPU
DeployR
Domino
Others?

Mark Sellors - Technical Architect
msellors@mango-solutions.com
Conclusion
Creating an API provides a simple
mechanism for exposing your functions to
other users.
Plumber provides a really simple way to
quickly create API’s using R

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Creating API's with R and plumber

1. Mark Sellors - Technical Architect msellors@mango-solutions.com APIs with R and plumber Mark Sellors - Mango Solutions

2. Mark Sellors - Technical Architect msellors@mango-solutions.com Me • Technical Architect • Data Engineering • DataOps • Analytic Maturity • Automation • Industrialisation

3. Mark Sellors - Technical Architect msellors@mango-solutions.com Agenda • API’s • Introducing plumber • How it works • A simple case study • Caveats • Summary

4. Mark Sellors - Technical Architect msellors@mango-solutions.com Data Science + API’s are Changing the World

5. Mark Sellors - Technical Architect msellors@mango-solutions.com Introducing plumber http://plumber.trestletech.com

6. Mark Sellors - Technical Architect msellors@mango-solutions.com Example - simple function > adder <- function(a, b){ + a + b + } > adder(4, 3) [1] 7

7. Mark Sellors - Technical Architect msellors@mango-solutions.com Example - add plumber #* @get /adder > adder <- function(a, b){ + as.numeric(a) + as.numeric(b) + }

8. Mark Sellors - Technical Architect msellors@mango-solutions.com Example - running with plumber > library(plumber) > r <- plumb("my_api_file.R") > r$run(port=8000)

9. Mark Sellors - Technical Architect msellors@mango-solutions.com Example - Accessing the API # curl http://localhost:8000/adder?a=4&b=3

10. Mark Sellors - Technical Architect msellors@mango-solutions.com Demo 1 - Simple API

11. Mark Sellors - Technical Architect msellors@mango-solutions.com Example - serving graphs

12. Mark Sellors - Technical Architect msellors@mango-solutions.com Demo 2 - Tick API

13. Mark Sellors - Technical Architect msellors@mango-solutions.com Why? What’s the point?

14. Mark Sellors - Technical Architect msellors@mango-solutions.com Example - Shiny App

15. Mark Sellors - Technical Architect msellors@mango-solutions.com Demo 3 - Currency Converter

16. Mark Sellors - Technical Architect msellors@mango-solutions.com Moving beyond the shiny app • split the application up • turn the function into a general purpose service • refactor the shiny app to use the API

17. Mark Sellors - Technical Architect msellors@mango-solutions.com Demo 4 - Currency API

18. Mark Sellors - Technical Architect msellors@mango-solutions.com Caveats

19. Mark Sellors - Technical Architect msellors@mango-solutions.com When not to use plumber • Shiny is a better for many users/uses • It’s predominantly for API’s, not a full web stack solution

20. Mark Sellors - Technical Architect msellors@mango-solutions.com Extra things to consider... • Security • input sanitisation • logging • monitoring • load balancing and state • blocking

21. Mark Sellors - Technical Architect msellors@mango-solutions.com The Competition RServe OpenCPU DeployR Domino Others?

22. Mark Sellors - Technical Architect msellors@mango-solutions.com Conclusion Creating an API provides a simple mechanism for exposing your functions to other users. Plumber provides a really simple way to quickly create API’s using R

Creating API's with R and plumber

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