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lack-middleware-mountweb

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We continue to review Lack's middlewares and this one gives you the ability to route requests to different apps depending on the path.

Here is a quick example. We want to plug a blog and admin into our main app:

POFTHEDAY> (defparameter *main-app*
             (lambda (env)
               (list 200 '(:content-type "text/plain")
                     (list (format nil "~A~%This is main app!"
                                   (getf env :path-info))))))

POFTHEDAY> (defparameter *blog*
             (lambda (env)
               (list 200 '(:content-type "text/plain")
                     (list (format nil "~A~%The Blog."
                                   (getf env :path-info))))))

POFTHEDAY> (defparameter *admin*
             (lambda (env)
               (list 200 '(:content-type "text/plain")
                     (list (format nil "~A~%Administration interface."
                                   (getf env :path-info))))))

POFTHEDAY> (clack:clackup
            (lack:builder
             (:mount "/blog" *blog*)
             (:mount "/admin" *admin*)
             *main-app*)
            :port 8044)
Hunchentoot server is started.
Listening on 127.0.0.1:8044.

POFTHEDAY> (dex:get "http://localhost:8044/some/page")
"/some/page
This is main app!"

POFTHEDAY> (dex:get "http://localhost:8044/blog/post-1")
"/post-1
The Blog."

POFTHEDAY> (dex:get "http://localhost:8044/admin/blog/posts?id=1")
"/blog/posts
Administration interface."

Pay attention to paths, returned as the first line of each response. It is relative to the mount point. This middleware rewrites the path so that an app can be mounted with any prefix.

That is it for today. Tomorrow we'll see how we can serve static with Lack.