82 lines
2.7 KiB
Common Lisp
82 lines
2.7 KiB
Common Lisp
;;;; cl-scopes/web/response - set up and render server response
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(defpackage :scopes/web/response
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(:use :common-lisp)
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(:local-nicknames (:core :scopes/core)
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(:dom :scopes/web/dom)
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(:message :scopes/core/message)
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(:shape :scopes/shape))
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(:export #:interaction #:setup #:html-response
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#:render #:render-content #:render-not-found))
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(in-package :scopes/web/response)
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(defvar *html-response-class* nil)
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(defclass response ()
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((context :reader context :initarg :context)
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(env :reader env :initarg :env)
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(ctype :reader ctype :allocation :class)))
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(defgeneric render-content (resp msg))
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(defclass plain-text-response (response)
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((ctype :initform "text/plain")))
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(defclass json-response (response)
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((ctype :initform "application/json")))
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;;;; server interaction - receive response message from action processing chain
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(defclass interaction ()
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((messages :accessor messages :initform nil)))
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(defmethod print-object ((ia interaction) s)
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(format s "<interaction ~s>" (messages ia)))
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(defmethod core:send ((ia interaction) msg)
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(log:debug "receiving ~s" msg)
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(push msg (messages ia)))
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;;;; html response
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(defclass html-response (response)
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((ctype :initform "text/html")))
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(defmethod render-content ((resp html-response) msg)
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(dom:render (dom:dlist nil (shape:data msg))))
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;;;; common definitions
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(defun setup (ctx env &key html-responder)
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(let* ((headers (getf env :headers))
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(resp-class (select-response-class (gethash "accept" headers) html-responder)))
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(make-instance resp-class :context ctx :env env)))
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(defun select-response-class (accept html-responder)
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(let ((accept (string-downcase accept)))
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(cond
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((str:containsp "html" accept) (html-response-class html-responder))
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((str:containsp "json" accept) 'json-response)
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((str:containsp "plain" accept) 'plain-text-response)
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(t (html-response-class html-responder)))))
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(defun html-response-class (html-responder)
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(or html-responder *html-response-class* 'html-response))
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(defun render (resp iact)
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; pre-process special message heads, e.g. (:system :error ...)
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; => set status code, provide additional data elements
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; set additional headers
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(let ((headers (list :content-type (ctype resp)))
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(rcode 200))
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#'(lambda (responder)
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(let ((writer (funcall responder (list rcode headers))))
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(dolist (msg (messages iact))
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(funcall writer (render-content resp msg)))
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(funcall writer nil :close t)))))
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; (content (mapcar #'(lambda (m) (render-content resp m)) (messages iact))))
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;(list rcode headers content)))
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(defun render-not-found(resp)
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(list 404 '(:content-type "text/plain") '("Not found")))
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