~lthms/lycan.lisp

3d62bd80ff1c41c7eba0391e57e5cd754db5c03d — Thomas Letan 1 year, 6 months ago 0674d38
refactor: Simplify the `get-player` function

The previous function was basically taking care of two different
things: (1) an asynchronous HTTP request, and (2) JSON parsing. This
patch divides this function into three, more focus simpler ones. As a
result, it is both more readable, and potentially easier to turn into
a reusable macro for future backend functions.

Signed-off-by: Thomas Letan <contact@thomasletan.fr>
1 files changed, 15 insertions(+), 14 deletions(-)

M backend.lisp
M backend.lisp => backend.lisp +15 -14
@@ 16,31 16,32 @@

(defpackage :lycan/backend
  (:nicknames :lb)
  (:use :cl :alexandria)
  (:use :cl :alexandria :flexi-streams)
  (:export get-player))

(cl:in-package :lycan/backend)

(defclass player ()
  ((name :initarg :name
         :initform (error "must have a name")
         :accessor name)
   (characters :initarg :characters
  ((characters :initarg :characters
               :initform nil
               :accessor characters)))

(defun get-player-url (name)
  (concatenate 'string "http://0.0.0.0:4001/player/" name))

(defun get-player (name &key then event-cb)
  (if then
      (blackbird:catcher
       (blackbird:multiple-promise-bind (body status)
           (das:http-request (concatenate 'string "http://0.0.0.0:4001/player/" name))
           (das:http-request (get-player-url name))
         (if (eq status 200)
             (let* ((json-str (flexi-streams:octets-to-string body
                                                              :external-format :utf-8))
                    (json (jsown:parse json-str))
                    (pl (make-instance 'player :name (jsown:val json "name"))))
               (funcall then pl))))
             (funcall then (byte-array-to-player body))))
       (error (e)
              (if event-cb
                  (funcall event-cb e))))
      (error "need to provide a callback to use the result"))))
              (when event-cb
                (funcall event-cb e))))
      (error "need to provide a callback to use the result")))

(defun byte-array-to-player (bytes)
  (let* ((json-str (octets-to-string bytes :external-format :utf-8))
         (json (jsown:parse json-str)))
    (make-instance 'player :characters (jsown:val json "characters"))))