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Yet another routes handling utility on top of Hunchentoot
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easy-routes.asd New syntax for route parameters Jul 1, 2017
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EASY-ROUTES is yet another routes handling system on top of Hunchentoot.

It's just glue code for Restas routing subsystem (CL-ROUTES).

It supports:

  • Dispatch based on HTTP method
  • Arguments extraction from the url path
  • Decorators


Use routes-acceptor acceptor:

(hunchentoot:start (make-instance 'easy-routes:routes-acceptor))

Note that the routes-acceptor returns with HTTP not found if no route matches and doesn't fallback to easy-handlers, and so it doesn't iterate over Hunchentoot *dispatch-table*. Most of the time, that iteration is a useful thing, so you may want to start the easy-routes:easy-routes-acceptor instead, that inherits from Hunchentoot easy-acceptor and so it iterates the dispatch table if no route matches (useful for being able to use define-easy-handler and also handling static files).



(defroute <name> (<path> &rest <route-options>) <route-params> 
   &body body)


  • path: A string with an url path that can contain arguments prefixed with a colon. Like "/foo/:x/:y", where :x and :y are bound into x and y variables in the context of the route body.

  • route-options: possible options are

    • :method - The HTTP method to dispatch. Either :get or :post.
    • :decorators - The decorators to attach (see below).
  • route-params: a list of params to be extracted from the url or HTTP request body (POST). Has this form: (params &get get-params &post post-params &path path-params), with the &get, &post and &path params sections being optional, and where params are grabbed via hunchentoot:parameter function, get-params via hunchentoot:get-parameter function, and post-params via hunchentoot:post-parameter function. path-params specifies the type of params in the url path (see below for an example).

    For example:

    (easy-routes:defroute name ("/foo/:x") (y &get z)
        (format nil "x: ~a y: ~y z: ~a" x y z))

    Also, params can have Hunchentoot easy-handler style options, described here:

    (var &key real-name parameter-type init-form request-type)

    For example:

    (easy-routes:defroute foo "/foo/:x" 
        ((y :real-name "Y" :init-form 22 :parameter-type 'integer))
      (format nil "~A - ~A" x y)) 

    You can also specify the type of path parameters after &path. For example, say you want to sum a path argument to a query argument. You can specify their type as 'INTEGER and calculate their sum without parsing:

    (easy-routes:defroute foo "/foo/:x" 
        ((y :init-form 10 :parameter-type 'integer) 
            &path (x 'integer))
                  (format nil "~A" (+ x y)))

Example route:

(defroute foo ("/foo/:arg1/:arg2" :method :get
                                  :decorators (@auth @db @html))
   (&get w)
    (format nil "<h1>FOO arg1: ~a arg2: ~a ~a</h1>" arg1 arg2 w))


Decorators are functions that are executed before the route body. They should call the next parameter function to continue executing the decoration chain and the route body finally.


(defun @auth (next)
  (let ((*user* (hunchentoot:session-value 'user)))
    (if (not *user*)
	(hunchentoot:redirect "/login")
	(funcall next))))

(defun @html (next)
  (setf (hunchentoot:content-type*) "text/html")
  (funcall next))

(defun @json (next)
  (setf (hunchentoot:content-type*) "application/json")
  (funcall next))

(defun @db (next)
  (postmodern:with-connection *db-spec*
    (funcall next)))





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Find a route by name (symbol)


(route-symbol &rest args &key &allow-other-keys)

Generate a relative url from a route name and arguments


(route-symbol &rest args &key &allow-other-keys)

Generate an absolute url from a route name and arguments


(route-symbol &rest args)

Redirect to a route url. Pass the route name and the parameters.



(name template-and-options params &body body)

Route definition syntax



This acceptor tries to match and handle easy-routes first, but fallbacks to easy-routes dispatcher if there's no matching


This acceptors handles routes and only routes. If no route is matched then an HTTP NOT FOUND error is returned. If you want to use Hunchentoot easy-handlers dispatch as a fallback, use EASY-ROUTES-ACCEPTOR

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