Updated compojure tut

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Adam 2014-09-11 16:17:06 +02:00
parent eab554a7a7
commit 3addfcf714

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@ -102,29 +102,72 @@ You can adjust what each parameter matches by supplying a regex:
```clojure
(defroutes myapp
(GET ["/file/:name.:ext" :name #".*", :ext #".*"] [name ext]
(str "File: " name ext))
(str "File: " name ext)))
```
Handlers may utilize query parameters:
### Middleware
Clojure uses [Ring](https://github.com/ring-clojure/ring) for routing.
Handlers are just functions that accept a request map and return a
response map (Compojure will turn strings into 200 responses for you).
You can easily write middleware that wraps all or part of your
application to modify requests or responses:
```clojure
(defroutes myapp
(GET "/posts" []
(fn [req]
(let [title (get (:params req) "title")
author (get (:params req) "title")]
" Do something with title and author"))))
(GET "/" req (str "Hello World v" (:app-version req))))
(defn wrap-version [handler]
(fn [request]
(handler (assoc request :app-version "1.0.1"))))
(defn -main []
(run-server (wrap-version myapp) {:port 5000}))
```
Or, for POST and PUT requests, form parameters
[Ring-Defaults](https://github.com/ring-clojure/ring-defaults) provides some handy
middlewares for sites and apis, so add it to your dependencies:
```
[ring/ring-defaults "0.1.1"]
```
Then, you can import it in your ns:
```
(ns myapp.core
(:require [compojure.core :refer :all]
[ring.middleware.defaults :refer :all]
[org.httpkit.server :refer [run-server]]))
```
And use `wrap-defaults` to add the `site-defaults` middleware to your
app:
```
(defn -main []
(run-server (wrap-defaults myapp site-defaults) {:port 5000}))
```
Now, your handlers may utilize query parameters:
```clojure
(defroutes myapp
(POST "/posts" []
(fn [req]
(let [title (get (:params req) "title")
author (get (:params req) "title")]
"Do something with title and author"))))
(GET "/posts" req
(let [title (get (:params req) "title")
author (get (:params req) "title")]
(str "Title: " title ", Author: " author))))
```
Or, for POST and PUT requests, form parameters as well
```clojure
(defroutes myapp
(POST "/posts" req
(let [title (get (:params req) "title")
author (get (:params req) "title")]
(str "Title: " title ", Author: " author))))
```