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;;; geiser-connection.el -- talking to a scheme process
;; Copyright (C) 2009, 2010, 2011, 2013, 2021 Jose Antonio Ortega Ruiz
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the Modified BSD License. You should
;; have received a copy of the license along with this program. If
;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
;; Start date: Sat Feb 07, 2009 21:11
;;; Commentary:
;; Connection datatype and functions for managing request queues
;; between emacs and inferior guile processes.
;;; Code:
(require 'geiser-log)
(require 'geiser-syntax)
(require 'geiser-base)
(require 'geiser-impl)
(require 'tq)
;;; Buffer connections:
(defvar-local geiser-con--connection nil)
(defun geiser-con--get-connection (buffer/proc)
(if (processp buffer/proc)
(geiser-con--get-connection (process-buffer buffer/proc))
(with-current-buffer buffer/proc geiser-con--connection)))
;;; Request datatype:
(defun geiser-con--make-request (con str cont &optional sender-buffer)
(list (cons :id (geiser-con--connection-inc-count con))
(cons :string str)
(cons :continuation cont)
(cons :buffer (or sender-buffer (current-buffer)))
(cons :connection con)))
(defsubst geiser-con--request-id (req)
(cdr (assq :id req)))
(defsubst geiser-con--request-string (req)
(cdr (assq :string req)))
(defsubst geiser-con--request-continuation (req)
(cdr (assq :continuation req)))
(defsubst geiser-con--request-buffer (req)
(cdr (assq :buffer req)))
(defsubst geiser-con--request-connection (req)
(cdr (assq :connection req)))
(defsubst geiser-con--request-deactivate (req)
(setcdr (assq :continuation req) nil))
(defsubst geiser-con--request-deactivated-p (req)
(null (cdr (assq :continuation req))))
;;; Connection datatype:
(defun geiser-con--tq-create (process)
(let ((tq (tq-create process)))
(set-process-filter process
`(lambda (p s) (geiser-con--tq-filter ',tq s)))
tq))
(defun geiser-con--tq-filter (tq in)
(when (buffer-live-p (tq-buffer tq))
(with-current-buffer (tq-buffer tq)
(if (tq-queue-empty tq)
(progn (geiser-log--error "Unexpected queue input:\n %s" in)
(delete-region (point-min) (point-max)))
(goto-char (point-max))
(insert in)
(goto-char (point-min))
(when (re-search-forward (tq-queue-head-regexp tq) nil t)
(unwind-protect
(funcall (tq-queue-head-fn tq)
(tq-queue-head-closure tq)
(buffer-substring (point-min) (point)))
(delete-region (point-min) (point-max))
(tq-queue-pop tq)))))))
(defun geiser-con--combined-prompt (prompt debug)
(if debug (format "\\(%s\\)\\|\\(%s\\)" prompt debug) prompt))
(defun geiser-con--connection-eot-re (prompt debug)
(geiser-con--combined-prompt (format "\n\\(%s\\)" prompt)
(and debug (format "\n\\(%s\\)" debug))))
(defun geiser-con--make-connection (proc prompt debug-prompt)
(list t
(cons :filter (process-filter proc))
(cons :tq (geiser-con--tq-create proc))
(cons :tq-filter (process-filter proc))
(cons :eot (geiser-con--connection-eot-re prompt debug-prompt))
(cons :prompt prompt)
(cons :debug-prompt debug-prompt)
(cons :is-debugging nil)
(cons :count 0)
(cons :completed (make-hash-table :weakness 'value))))
(defsubst geiser-con--connection-process (c)
(tq-process (cdr (assq :tq c))))
(defsubst geiser-con--connection-filter (c)
(cdr (assq :filter c)))
(defsubst geiser-con--connection-tq-filter (c)
(cdr (assq :tq-filter c)))
(defsubst geiser-con--connection-tq (c)
(cdr (assq :tq c)))
(defsubst geiser-con--connection-eot (c)
(cdr (assq :eot c)))
(defsubst geiser-con--connection-prompt (c)
(cdr (assq :prompt c)))
(defsubst geiser-con--connection-debug-prompt (c)
(cdr (assq :debug-prompt c)))
(defsubst geiser-con--connection-is-debugging (c)
(cdr (assq :is-debugging c)))
(defsubst geiser-con--connection-set-debugging (c d)
(setcdr (assq :is-debugging c) d))
(defun geiser-con--connection-update-debugging (c txt)
(let* ((dp (geiser-con--connection-debug-prompt c))
(is-d (and (stringp dp) (string-match dp txt))))
(geiser-con--connection-set-debugging c is-d)
is-d))
(defsubst geiser-con--connection-completed (c r)
(geiser-con--request-deactivate r)
(puthash (geiser-con--request-id r) r (cdr (assoc :completed c))))
(defsubst geiser-con--connection-completed-p (c id)
(gethash id (cdr (assoc :completed c))))
(defun geiser-con--connection-inc-count (c)
(let* ((cnt (assoc :count c))
(new (1+ (cdr cnt))))
(setcdr cnt new)
new))
(defun geiser-con--has-entered-debugger (con answer)
(and (not (geiser-con--connection-is-debugging con))
(let ((p (car (last (split-string answer "\n" t)))))
(and p (geiser-con--connection-update-debugging con p)))))
(defun geiser-con--connection-eot-p (con txt)
(and txt
(string-match-p (geiser-con--connection-eot con) txt)))
(defun geiser-con--connection-close (con)
(let ((tq (geiser-con--connection-tq con)))
(and tq (tq-close tq))))
(defvar geiser-con--startup-prompt nil)
(defun geiser-con--startup-prompt (p s)
(setq geiser-con--startup-prompt
(concat geiser-con--startup-prompt s))
nil)
(defun geiser-con--connection-deactivate (c &optional no-wait)
(when (car c)
(let* ((tq (geiser-con--connection-tq c))
(proc (geiser-con--connection-process c))
(proc-filter (geiser-con--connection-filter c)))
(unless no-wait
(while (and (not (tq-queue-empty tq))
(accept-process-output proc 0.1))))
(set-process-filter proc proc-filter)
(setcar c nil))))
(defun geiser-con--connection-activate (c)
(when (not (car c))
(let* ((tq (geiser-con--connection-tq c))
(proc (geiser-con--connection-process c))
(tq-filter (geiser-con--connection-tq-filter c)))
(while (accept-process-output proc 0.01))
(set-process-filter proc tq-filter)
(setcar c t))))
;;; Requests handling:
(defun geiser-con--req-form (req answer)
(let ((con (geiser-con--request-connection req)))
(if (or (geiser-con--connection-is-debugging con)
(geiser-con--has-entered-debugger con answer))
`((error (key . geiser-debugger))
(output . ,answer))
(condition-case err
(let ((start (string-match "((\\(?:result)?\\|error\\) " answer)))
(or (and start (car (read-from-string answer start)))
`((error (key . retort-syntax)) (output . ,answer))))
(error `((error (key . geiser-con-error))
(output . ,(format "%s\n(%s)"
answer (error-message-string err)))))))))
(defun geiser-con--process-completed-request (req answer)
(let ((cont (geiser-con--request-continuation req))
(id (geiser-con--request-id req))
(rstr (geiser-con--request-string req))
(form (geiser-con--req-form req answer))
(buffer (or (geiser-con--request-buffer req) (current-buffer)))
(con (geiser-con--request-connection req)))
(if (not cont)
(geiser-log--warn "<%s> Dropping result for request %S: %s"
id rstr form)
(condition-case cerr
(with-current-buffer buffer
(funcall cont form)
(geiser-log--info "<%s>: processed" id))
(error (geiser-log--error
"<%s>: continuation failed %S \n\t%s" id rstr cerr))))
(geiser-con--connection-completed con req)))
(defun geiser-con--connection-add-request (c r)
(let ((rstr (geiser-con--request-string r)))
(geiser-log--info "REQUEST: <%s>: %s"
(geiser-con--request-id r)
rstr)
(geiser-con--connection-activate c)
(tq-enqueue (geiser-con--connection-tq c)
(concat rstr "\n")
(geiser-con--connection-eot c)
r
'geiser-con--process-completed-request
t)))
;;; Message sending interface:
(defun geiser-con--send-string (con str cont &optional sbuf)
(let ((req (geiser-con--make-request con str cont sbuf)))
(geiser-con--connection-add-request con req)
req))
(defvar geiser-connection-timeout 30000
"Time limit, in msecs, blocking on synchronous evaluation requests")
(defun geiser-con--send-string/wait (con str cont &optional timeout sbuf)
(save-current-buffer
(let ((proc (and con (geiser-con--connection-process con))))
(unless proc (error "Geiser connection not active"))
(let* ((req (geiser-con--send-string con str cont sbuf))
(id (geiser-con--request-id req))
(timeout (/ (or timeout geiser-connection-timeout) 1000.0)))
(with-timeout (timeout (geiser-con--request-deactivate req))
(condition-case nil
(while (and (geiser-con--connection-process con)
(not (geiser-con--connection-completed-p con id)))
(accept-process-output proc (/ timeout 10)))
(error (geiser-con--request-deactivate req))))))))
(provide 'geiser-connection)
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