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jupyter-channel-ioloop.el
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jupyter-channel-ioloop.el
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;;; jupyter-channel-ioloop.el --- Abstract class to communicate with a jupyter-channel in a subprocess -*- lexical-binding: t -*-
;; Copyright (C) 2019-2020 Nathaniel Nicandro
;; Author: Nathaniel Nicandro <[email protected]>
;; Created: 27 Jun 2019
;; 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, 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 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:
;; Define a `jupyter-ioloop' that can be sent events to start, stop, or send a
;; message on a set of `jupyter-channel' objects. For example to start a
;; `jupyter-channel' in the subprocess environment you would do something like
;;
;; (jupyter-send ioloop 'start-channel TYPE ENDPOINT)
;;
;; where TYPE and ENDPOINT have the same meaning as in `jupyter-channel'.
;;
;; Note by default, no channels are available in the subprocess environment.
;; You initialize channels by setting the `jupyter-channel-ioloop-channels'
;; variable in the subprocess environment, e.g. using
;; `jupyter-ioloop-add-setup', before starting the `jupyter-ioloop'.
;;
;; When you call `jupyter-ioloop-start' a `jupyter-session' object needs to
;; passed as the second argument with whatever object you would like to receive
;; events as the third. The `jupyter-session-id' will be used as the value of
;; the :identity key in the call to `jupyter-start-channel' when starting a
;; channel.
;;
;; Each event sent to the subprocess will send back a corresponding
;; confirmation event, the three events that can be sent and their
;; corresponding confirmation events are:
;;
;; (start-channel TYPE ENDPOINT) -> (start-channel TYPE)
;; (stop-channel TYPE) -> (stop-channel TYPE)
;; (send TYPE MSG-TYPE MSG MSG-ID) -> (sent MSG-ID)
;;
;; For the send event, the MSG-TYPE, MSG, and MSG-ID have the same meaning as
;; the TYPE, MSG, and MSG-ID arguments of the `jupyter-send' method of a
;; `jupyter-channel'.
;;
;; Ex.
;;
;; (let ((ioloop (jupyter-channel-ioloop))
;; (session (jupyter-session :id ...)))
;; (jupyter-start-ioloop ioloop session ...)
;; ...
;; (jupyter-send ioloop 'start-channel ...)
;; ...)
;;; Code:
(require 'jupyter-ioloop)
(defvar jupyter-channel-ioloop-session nil
"The `jupyter-session' used when initializing Jupyter channels.")
(defvar jupyter-channel-ioloop-channels nil
"A list of synchronous channels in an ioloop controlling Jupyter channels.")
(jupyter-ioloop-add-arg-type jupyter-channel
(lambda (arg)
`(or (object-assoc ,arg :type jupyter-channel-ioloop-channels)
(error "Channel not alive (%s)" ,arg))))
(defclass jupyter-channel-ioloop (jupyter-ioloop)
()
:abstract t)
(cl-defmethod initialize-instance ((ioloop jupyter-channel-ioloop) &optional _slots)
(cl-call-next-method)
(jupyter-ioloop-add-setup ioloop
(require 'jupyter-channel-ioloop))
(jupyter-channel-ioloop-add-start-channel-event ioloop)
(jupyter-channel-ioloop-add-stop-channel-event ioloop)
(jupyter-channel-ioloop-add-send-event ioloop)
(jupyter-ioloop-add-teardown ioloop
(mapc #'jupyter-stop-channel jupyter-channel-ioloop-channels)))
(defun jupyter-channel-ioloop--set-session (ioloop session)
"In the IOLOOP, set SESSION as the `jupyter-channel-ioloop-session'.
Add a form to IOLOOP's setup that sets the variable
`jupyter-channel-ioloop-session' to a `jupyter-session' based on
SESSION's id and key. Remove any top level form in the setup that
sets `jupyter-channel-ioloop-session' via `setq' before doing so."
(cl-callf (lambda (setup)
(cons `(setq jupyter-channel-ioloop-session
(jupyter-session
:id ,(jupyter-session-id session)
:key ,(jupyter-session-key session)))
(cl-remove-if
(lambda (f) (and (eq (car f) 'setq)
(eq (cadr f) 'jupyter-channel-ioloop-session)))
setup)))
(oref ioloop setup)))
(cl-defmethod jupyter-ioloop-start ((ioloop jupyter-channel-ioloop)
(session jupyter-session)
obj &key buffer)
"Start IOLOOP, using SESSION to set the `jupyter-channel-ioloop-session'.
Add setup forms to IOLOOP that will initialize the
`jupyter-channel-ioloop-session' variable to a `jupyter-session'
based on SESSION's id and key. Also add
`jupyter-ioloop-recv-messages' to `jupyter-ioloop-post-hook'. In
addition add the events send, start-channel, and stop-channel
that the parent Emacs process can send to the IOLOOP. See
`jupyter-channel-ioloop-add-send-event',
`jupyter-channel-ioloop-add-start-channel-event', and
`jupyter-ioloop-add-stop-channel-event'.
After doing the above initialization, start the IOLOOP. OBJ and
BUFFER have the same meaning as in the method definition for
`jupyter-ioloop'."
(jupyter-channel-ioloop--set-session ioloop session)
(cl-call-next-method ioloop obj :buffer buffer))
;;; Channel events
(defun jupyter-channel-ioloop-add-start-channel-event (ioloop)
"Add a start-channel event handler to IOLOOP.
The event fires when the IOLOOP receives a list with the form
(start-channel CHANNEL-TYPE ENDPOINT)
and shall stop any existing channel with CHANNEL-TYPE and start a
new channel with CHANNEL-TYPE connected to ENDPOINT. The
underlying socket IDENTITY is derived from
`jupyter-channel-ioloop-session' in the IOLOOP environment. The
channel will be added to the variable
`jupyter-channel-ioloop-channels' in the IOLOOP environment.
Note, before sending this event to IOLOOP, the corresponding
channel needs to be available in the
`jupyer-channel-ioloop-channels' variable. You can initialize
this variable in the setup form of IOLOOP.
A list with the form
(start-channel CHANNEL-TYPE)
is returned to the parent process."
(jupyter-ioloop-add-event
ioloop start-channel ((channel jupyter-channel) endpoint)
;; Stop the channel if it is already alive
(when (jupyter-channel-alive-p channel)
(jupyter-stop-channel channel))
;; Start the channel
(oset channel endpoint endpoint)
(let ((identity (jupyter-session-id jupyter-channel-ioloop-session)))
(jupyter-start-channel channel :identity identity))
(list 'start-channel (oref channel type))))
(defun jupyter-channel-ioloop-add-stop-channel-event (ioloop)
"Add a stop-channel event handler to IOLOOP.
The event fires when the IOLOOP receives a list with the form
(stop-channel CHANNEL-TYPE)
If a channel with CHANNEL-TYPE exists and is alive, it is stopped.
A list with the form
(stop-channel CHANNEL-TYPE)
is returned to the parent process."
(jupyter-ioloop-add-event ioloop stop-channel (type)
(let ((channel (object-assoc type :type jupyter-channel-ioloop-channels)))
(when (and channel (jupyter-channel-alive-p channel))
(jupyter-stop-channel channel))
(list 'stop-channel type))))
(defun jupyter-channel-ioloop-add-send-event (ioloop)
"Add a send event handler to IOLOOP.
The event fires when the IOLOOP receives a list of the form
(send CHANNEL-TYPE MSG-TYPE MSG MSG-ID)
and calls (jupyter-send CHANNEL MSG-TYPE MSG MSG-ID) using the
channel corresponding to CHANNEL-TYPE in the IOLOOP environment.
A list of the form
(sent CHANNEL-TYPE MSG-ID)
is returned to the parent process."
(jupyter-ioloop-add-event
ioloop send ((channel jupyter-channel) msg-type msg msg-id)
(list 'sent (oref channel type)
(jupyter-send channel msg-type msg msg-id))))
(provide 'jupyter-channel-ioloop)
;;; jupyter-channel-ioloop.el ends here