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;;; gh-api.el --- api definition for gh.el
;; Copyright (C) 2011 Yann Hodique
;; Author: Yann Hodique <yann.hodique@gmail.com>
;; Keywords:
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;
;;; Code:
(eval-when-compile
(require 'cl))
(require 'json)
(require 'gh-auth)
(require 'gh-cache)
(defgroup gh-api nil
"Github API."
:group 'gh)
;;;###autoload
(defclass gh-api ()
((sync :initarg :sync :initform t)
(cache :initarg :cache :initform nil)
(base :initarg :base :type string)
(auth :initarg :auth :initform nil)
(data-format :initarg :data-format)
(num-retries :initarg :num-retries :initform 0)
(cache-cls :initform gh-cache :allocation :class))
"Github API")
(defmethod constructor :static ((api gh-api) newname &rest args)
(call-next-method))
(defmethod gh-api-set-default-auth ((api gh-api) auth)
(let ((auth (or (oref api :auth) auth))
(cache (oref api :cache)))
(oset api :auth auth)
(unless (or (null cache)
(and (eieio-object-p cache)
(object-of-class-p cache 'gh-cache)))
(oset api :cache (funcall (oref api cache-cls)
(format "gh/%s/%s"
(symbol-name (object-class api))
(gh-api-get-username api)))))))
(defmethod gh-api-expand-resource ((api gh-api)
resource)
resource)
(defmethod gh-api-get-username ((api gh-api))
(oref (oref api :auth) :username))
;;;###autoload
(defclass gh-api-v2 (gh-api)
((base :initarg :base :initform "https://github.com/api/v2/json")
(data-format :initarg :data-format :initform :json)))
(defcustom gh-api-v2-authenticator 'gh-oauth-authenticator
"Authenticator for Github API v2"
:type '(choice (const :tag "Password" gh-password-authenticator)
(const :tag "OAuth" gh-oauth-authenticator))
:group 'gh-api)
(defmethod constructor :static ((api gh-api-v2) newname &rest args)
(let ((obj (call-next-method)))
(gh-api-set-default-auth obj (funcall gh-api-v2-authenticator "auth"))
obj))
;;;###autoload
(defclass gh-api-v3 (gh-api)
((base :initarg :base :initform "https://api.github.com")
(data-format :initarg :data-format :initform :json))
"Github API v3")
(defcustom gh-api-v3-authenticator 'gh-oauth-authenticator
"Authenticator for Github API v3"
:type '(choice (const :tag "Password" gh-password-authenticator)
(const :tag "OAuth" gh-oauth-authenticator))
:group 'gh-api)
(defmethod constructor :static ((api gh-api-v3) newname &rest args)
(let ((obj (call-next-method)))
(gh-api-set-default-auth obj (funcall gh-api-v3-authenticator "auth"))
obj))
(defclass gh-api-request ()
((method :initarg :method :type string)
(url :initarg :url :type string)
(headers :initarg :headers)
(data :initarg :data :initform "" :type string)))
(defclass gh-api-response ()
((data-received :initarg :data-received :initform nil)
(data :initarg :data :initform nil)
(callbacks :initarg :callbacks :initform nil))
"Class for API responses")
(defun gh-api-json-decode (repr)
(if (or (null repr) (string= repr ""))
'empty
(let ((json-array-type 'list))
(json-read-from-string repr))))
(defun gh-api-json-encode (json)
(json-encode-list json))
(defun gh-api-form-encode (form)
(mapconcat (lambda (x) (format "%s=%s" (car x) (cdr x)))
form "&"))
(defun gh-api-params-encode (form)
(concat "?" (gh-api-form-encode form)))
(defmethod gh-api-response-init ((resp gh-api-response)
buffer &optional transform)
(declare (special url-http-end-of-headers))
(unwind-protect
(with-current-buffer buffer
(goto-char (1+ url-http-end-of-headers))
(oset resp :data (let ((raw (buffer-substring (point) (point-max))))
(if transform
(funcall transform (gh-api-json-decode raw))
raw)))
(oset resp :data-received t))
(kill-buffer buffer))
(gh-api-response-run-callbacks resp)
resp)
(defun gh-api-set-response (status retry-data)
(destructuring-bind (api req transform resp num) retry-data
(condition-case err
(gh-api-response-init resp (current-buffer) transform)
(error
(if (or (null num) (zerop num))
(signal (car err) (cdr err))
(message "[gh-api] retrying request %s %s"
(oref req :method) (oref req :url))
(let ((num (1- num)))
(gh-api-run-request api req transform resp num)))))))
(defmethod gh-api-response-run-callbacks ((resp gh-api-response))
(flet ((gh-api-copy-list (list)
(if (consp list)
(let ((res nil))
(while (consp list) (push (pop list) res))
(prog1 (nreverse res) (setcdr res list)))
(car list))))
(let ((data (oref resp :data)))
(dolist (cb (gh-api-copy-list (oref resp :callbacks)))
(if (or (functionp cb) (symbolp cb))
(funcall cb data)
(apply (car cb) data (cdr cb)))
(object-remove-from-list resp :callbacks cb))))
resp)
(defmethod gh-api-add-response-callback ((resp gh-api-response) callback)
(object-add-to-list resp :callbacks callback t)
(if (oref resp :data-received)
(gh-api-response-run-callbacks resp)
resp))
(defmethod gh-api-authenticated-request
((api gh-api) transformer method resource &optional data params)
(let* ((fmt (oref api :data-format))
(headers (when (eq fmt :form)
'(("Content-Type" . "application/x-www-form-urlencoded"))))
(cache (oref api :cache))
(key (and cache
(member method (oref cache safe-methods))
(list resource
method
(sha1 (format "%s" transformer)))))
(has-value (and key (pcache-has cache key)))
(value (and has-value (pcache-get cache key)))
(req
(and (not has-value) ;; we'll need the req only if value's not
;; already in cache
(gh-auth-modify-request
(oref api :auth)
(gh-api-request "request"
:method method
:url (concat (oref api :base)
(gh-api-expand-resource
api resource)
(if params
(gh-api-params-encode params)
""))
:headers headers
:data (or (and (eq fmt :json)
(gh-api-json-encode data))
(and (eq fmt :form)
(gh-api-form-encode data))
""))))))
(cond (has-value ;; got value from cache
(gh-api-response "cached" :data-received t :data value))
(key ;; no value, but cache exists and method is safe
(let ((resp (gh-api-run-request api req transformer)))
(gh-api-add-response-callback
resp (list #'(lambda (value cache key)
(pcache-put cache key value))
cache key))
resp))
(cache ;; unsafe method, cache exists
(pcache-invalidate cache key)
(gh-api-run-request api req transformer))
(t ;; no cache involved
(gh-api-run-request api req transformer)))))
(defmethod gh-api-run-request ((api gh-api) req transformer &optional resp num)
(let ((url-request-method (oref req :method))
(url-request-data (oref req :data))
(url-request-extra-headers (oref req :headers))
(url (oref req :url)))
(if (oref api :sync)
(let* ((resp (or resp (gh-api-response "sync")))
(retry-data (list api req transformer resp
(or num (oref api :num-retries)))))
(with-current-buffer (url-retrieve-synchronously url)
(gh-api-set-response nil retry-data))
resp)
(let* ((resp (or resp (gh-api-response "async")))
(retry-data (list api req transformer resp
(or num (oref api :num-retries)))))
(url-retrieve url 'gh-api-set-response (list retry-data))
resp))))
(provide 'gh-api)
;;; gh-api.el ends here
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