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promise-rejection-tracking.el
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;;; promise-rejection-tracking.el --- Porting rejection-tracking.js -*- lexical-binding: t; -*-
;; Copyright (C) 2016-2017 chuntaro
;; Author: chuntaro <[email protected]>
;; URL: https://github.com/chuntaro/emacs-promise
;; Keywords: async promise convenience
;; This program 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 3 of the License, or
;; (at your option) any later version.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;; The original JavaScript code is:
;;
;; Copyright (c) 2014 Forbes Lindesay
;;
;; Permission is hereby granted, free of charge, to any person obtaining a copy
;; of this software and associated documentation files (the "Software"), to deal
;; in the Software without restriction, including without limitation the rights
;; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
;; copies of the Software, and to permit persons to whom the Software is
;; furnished to do so, subject to the following conditions:
;;
;; The above copyright notice and this permission notice shall be included in
;; all copies or substantial portions of the Software.
;;
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
;; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
;; THE SOFTWARE.
;;; Commentary:
;; This implementation ported the following implementation faithfully.
;; https://github.com/then/promise/blob/master/src/rejection-tracking.js
;; TODO: Display easy-to-read backtrace
;;; Code:
(require 'promise-core)
(defun promise--warn (message &rest args)
(display-warning 'promise (apply #'format-message message args)))
(defvar promise--default-whitelist '(void-function
void-variable
wrong-type-argument
args-out-of-range))
(defvar promise--enabled nil)
(defun promise-rejection-tracking-disable ()
(setf promise--enabled nil
promise--on-handle nil
promise--on-reject nil))
(defun promise-rejection-tracking-enable (&optional options)
(when promise--enabled (promise-rejection-tracking-disable))
(setf promise--enabled t)
(let ((id -1)
(display-id -1)
(rejections (make-hash-table)))
(cl-flet*
((rejections (id symbol) (alist-get symbol (gethash id rejections)))
(rejections-set (id symbol value)
(setf (alist-get symbol (gethash id rejections))
value))
(options (sym) (alist-get sym options))
(on-unhandled (id)
(when (or (options 'all-rejections)
(promise--match-whitelist
(rejections id 'error)
(or (options 'whitelist)
promise--default-whitelist)))
(rejections-set id 'display-id (cl-incf display-id))
(cond
((options 'on-unhandled)
(rejections-set id 'logged t)
(funcall (options 'on-unhandled)
(rejections id 'display-id)
(rejections id 'error)))
(t
(rejections-set id 'logged t)
(promise--log-error (rejections id 'display-id)
(rejections id 'error))))))
(on-handled (id)
(when (rejections id 'logged)
(cond
((options 'on-handled)
(funcall (options 'on-handled)
(rejections id 'display-id)
(rejections id 'error)))
((not (rejections id 'on-unhandled))
(promise--warn "Promise Rejection Handled (id:%d):"
(rejections id 'display-id))
(promise--warn " This means you can ignore any previous messages of the form \"Possible Unhandled Promise Rejection\" with id %d."
(rejections id 'display-id)))))))
(setf promise--on-handle
(lambda (promise)
(when (and (= (promise-_state promise) 2) ; IS REJECTED
(gethash (promise-_rejection-id promise) rejections))
(if (rejections (promise-_rejection-id promise) 'logged)
(on-handled (promise-_rejection-id promise))
(cancel-timer (rejections (promise-_rejection-id promise) 'timeout)))
(remhash (promise-_rejection-id promise) rejections)))
promise--on-reject
(lambda (promise err)
(when (zerop (promise-_deferred-state promise)) ; not yet handled
(setf (promise-_rejection-id promise) (cl-incf id))
(puthash (promise-_rejection-id promise)
`((display-id . nil)
(error . ,err)
(timeout . ,(run-at-time
(if (promise--match-whitelist
err promise--default-whitelist)
0.1
2)
nil
(lambda ()
(on-unhandled (promise-_rejection-id promise)))))
(logged . nil))
rejections)))))))
(defun promise--log-error (id error)
(promise--warn "Possible Unhandled Promise Rejection (id:%d):" id)
(display-warning 'promise (prin1-to-string error)))
(defun promise--match-whitelist (error list)
(cl-some (lambda (cls)
(eq (or (and (consp error)
(car error))
error)
cls))
list))
(provide 'promise-rejection-tracking)
;;; promise-rejection-tracking.el ends here