Ring: Web Apps in Idiomatic Clojure
25 likes5,700 views
Ring provides a common abstraction for building web applications in Clojure. It defines handlers as functions that take HTTP requests as maps and return responses as maps. Adapters run handlers on web servers, and middleware can augment handlers. This allows writing web apps in an idiomatic way and sharing code across frameworks that target the Ring spec.
![Example: Hello World
(defn app [req]
{:status 200
:headers {"Content-Type" "text/html"}
:body (str "Hi from " (:server-name req))})](https://image.slidesharecdn.com/talk-100123191454-phpapp01/85/Ring-Web-Apps-in-Idiomatic-Clojure-22-320.jpg)
![Example: Hello World
(defn app [req]
{:status 200
:headers {"Content-Type" "text/html"}
:body (str "Hi from " (:server-name req))})
(use ’ring.adapter.jetty)
(run-jetty app {:port 8080})](https://image.slidesharecdn.com/talk-100123191454-phpapp01/85/Ring-Web-Apps-in-Idiomatic-Clojure-23-320.jpg)
![Example: Stacktraces
(defn app [req]
("o noes"))](https://image.slidesharecdn.com/talk-100123191454-phpapp01/85/Ring-Web-Apps-in-Idiomatic-Clojure-25-320.jpg)
![Example: Stacktraces
(defn app [req]
("o noes"))
(use ’ring.adapter.jetty)
(use ’ring.middleware.stacktrace)
(run-jetty (wrap-stacktrace app) {:port 8080})](https://image.slidesharecdn.com/talk-100123191454-phpapp01/85/Ring-Web-Apps-in-Idiomatic-Clojure-26-320.jpg)
![Example: Static Files
(defn dynamic-app [req]
(...))](https://image.slidesharecdn.com/talk-100123191454-phpapp01/85/Ring-Web-Apps-in-Idiomatic-Clojure-28-320.jpg)
![Example: Static Files
(defn dynamic-app [req]
(...))
(use ’ring.middleware.file)
(use ’ring.middleware.file-info)
(def app
(-> dynamic-app
(wrap-file "public")
(wrap-file-info)))](https://image.slidesharecdn.com/talk-100123191454-phpapp01/85/Ring-Web-Apps-in-Idiomatic-Clojure-29-320.jpg)
![Example: Testability
(defn my-app [req]
(...))](https://image.slidesharecdn.com/talk-100123191454-phpapp01/85/Ring-Web-Apps-in-Idiomatic-Clojure-31-320.jpg)
![Example: Testability
(defn my-app [req]
(...))
(deftest not-found-error
(let [req {:uri "/bogus/uri"}
resp (my-app req)]
(is (= 404 (:status resp)))))](https://image.slidesharecdn.com/talk-100123191454-phpapp01/85/Ring-Web-Apps-in-Idiomatic-Clojure-32-320.jpg)
![[JCConf 2020] 用 Kotlin 跨入 Serverless 世代](https://cdn.slidesharecdn.com/ss_thumbnails/serverless-kotlin-201121155648-thumbnail.jpg?width=560&fit=bounds)
Ad
More Related Content
What's hot (20)
Viewers also liked (20)
Ad
Similar to Ring: Web Apps in Idiomatic Clojure (20)
Ad
Recently uploaded (20)
Ring: Web Apps in Idiomatic Clojure
- 1. Ring Web Apps in Idiomatic Clojure Mark McGranaghan January 23, 2010
- 2. About Mark Bowdoin College ’10 Clojure user since 2008 Open source: http://github.com/mmcgrana
- 4. Motivation for Ring Abstract HTTP
- 5. Motivation for Ring Abstract HTTP Write apps in idiomatic Clojure
- 6. Motivation for Ring Abstract HTTP Write apps in idiomatic Clojure Share code across web frameworks
- 7. Motivation for Ring Abstract HTTP Write apps in idiomatic Clojure Share code across web frameworks Deploy on a variety of web servers
- 8. Motivation for Ring Abstract HTTP Write apps in idiomatic Clojure Share code across web frameworks Deploy on a variety of web servers WSGI & Rack
- 10. The Ring Project Spec
- 11. The Ring Project Spec Library
- 12. The Ring Project Spec Library Ecosystem
- 13. Overview of Ring
- 14. Overview of Ring Handlers are functions
- 15. Overview of Ring Handlers are functions that take requests as Clojure maps
- 16. Overview of Ring Handlers are functions that take requests as Clojure maps and return responses as Clojure map
- 17. Overview of Ring Handlers are functions that take requests as Clojure maps and return responses as Clojure map Adapters run handlers on a web server
- 18. Overview of Ring Handlers are functions that take requests as Clojure maps and return responses as Clojure map Adapters run handlers on a web server Middleware augments handlers
- 19. “Ring”
- 20. Request Map {:uri <String> :query-string <String> :request-method <Keyword> :headers <IPersistentMap> :body <InputStream> ... ...}
- 21. Response Map {:status <Integer> :headers <IPersistentMap> :body <String, ISeq, File, InputStream>}
- 22. Example: Hello World (defn app [req] {:status 200 :headers {"Content-Type" "text/html"} :body (str "Hi from " (:server-name req))})
- 23. Example: Hello World (defn app [req] {:status 200 :headers {"Content-Type" "text/html"} :body (str "Hi from " (:server-name req))}) (use ’ring.adapter.jetty) (run-jetty app {:port 8080})
- 25. Example: Stacktraces (defn app [req] ("o noes"))
- 26. Example: Stacktraces (defn app [req] ("o noes")) (use ’ring.adapter.jetty) (use ’ring.middleware.stacktrace) (run-jetty (wrap-stacktrace app) {:port 8080})
- 28. Example: Static Files (defn dynamic-app [req] (...))
- 29. Example: Static Files (defn dynamic-app [req] (...)) (use ’ring.middleware.file) (use ’ring.middleware.file-info) (def app (-> dynamic-app (wrap-file "public") (wrap-file-info)))
- 31. Example: Testability (defn my-app [req] (...))
- 32. Example: Testability (defn my-app [req] (...)) (deftest not-found-error (let [req {:uri "/bogus/uri"} resp (my-app req)] (is (= 404 (:status resp)))))
- 33. Ring and Web Frameworks
- 34. Ring and Web Frameworks Foundation, not replacement
- 35. Ring and Web Frameworks Foundation, not replacement Avoid duplication and share code
- 36. Ring and Web Frameworks Foundation, not replacement Avoid duplication and share code Compojure, Conjure, Weld all targeting Ring
- 37. Ring and Web Frameworks Foundation, not replacement Avoid duplication and share code Compojure, Conjure, Weld all targeting Ring Compojure case study
- 38. Ring Middleware
- 39. Ring Middleware ring.middleware.reload: Automatically reload namespaces
- 40. Ring Middleware ring.middleware.reload: Automatically reload namespaces ring.middleware.params: Get request params as a map
- 41. Ring Middleware ring.middleware.reload: Automatically reload namespaces ring.middleware.params: Get request params as a map ring.middleware.cookies: Cookie jar abstraction
- 42. Other Components
- 43. Other Components ring.util.servlet: If you really want a Servlet
- 44. Other Components ring.util.servlet: If you really want a Servlet ring.adapter.httpcore: Adapter for HTTP Core library
- 45. Other Components ring.util.servlet: If you really want a Servlet ring.adapter.httpcore: Adapter for HTTP Core library ring.handler.dump: See the request map
- 46. Other Components ring.util.servlet: If you really want a Servlet ring.adapter.httpcore: Adapter for HTTP Core library ring.handler.dump: See the request map ring.examples.*: Runnable examples
- 47. Future Work
- 48. Future Work Middleware and utility extraction from frameworks
- 49. Future Work Middleware and utility extraction from frameworks Not a framework itself
- 50. Future Work Middleware and utility extraction from frameworks Not a framework itself More use in production?
- 51. Future Work Middleware and utility extraction from frameworks Not a framework itself More use in production? User needs?
- 52. Learn More http://github.com/mmcgrana/ring ring/example/*.clj ring/SPEC