1 ;;; fuel-connection.el -- asynchronous comms with the fuel listener
3 ;; Copyright (C) 2008 Jose Antonio Ortega Ruiz
4 ;; See http://factorcode.org/license.txt for BSD license.
6 ;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
7 ;; Keywords: languages, fuel, factor
8 ;; Start date: Thu Dec 11, 2008 03:10
12 ;; Handling communications via a comint buffer running a factor
18 ;;; Default connection:
20 (make-variable-buffer-local
21 (defvar fuel-con--connection nil))
23 (defun fuel-con--get-connection (buffer/proc)
24 (if (processp buffer/proc)
25 (fuel-con--get-connection (process-buffer buffer/proc))
26 (with-current-buffer buffer/proc
27 (or fuel-con--connection
28 (setq fuel-con--connection
29 (fuel-con--setup-connection buffer/proc))))))
32 ;;; Request and connection datatypes:
34 (defun fuel-con--connection-queue-request (c r)
35 (let ((reqs (assoc :requests c)))
36 (setcdr reqs (append (cdr reqs) (list r)))))
38 (defun fuel-con--make-request (str cont &optional sender-buffer)
39 (list :fuel-connection-request
42 (cons :continuation cont)
43 (cons :buffer (or sender-buffer (current-buffer)))
46 (defsubst fuel-con--request-p (req)
47 (and (listp req) (eq (car req) :fuel-connection-request)))
49 (defsubst fuel-con--request-id (req)
50 (cdr (assoc :id req)))
52 (defsubst fuel-con--request-string (req)
53 (cdr (assoc :string req)))
55 (defsubst fuel-con--request-continuation (req)
56 (cdr (assoc :continuation req)))
58 (defsubst fuel-con--request-buffer (req)
59 (cdr (assoc :buffer req)))
61 (defun fuel-con--request-output (req &optional suffix)
62 (let ((cell (assoc :output req)))
63 (when suffix (setcdr cell (concat (cdr cell) suffix)))
66 (defsubst fuel-con--request-deactivate (req)
67 (setcdr (assoc :continuation req) nil))
69 (defsubst fuel-con--request-deactivated-p (req)
70 (null (cdr (assoc :continuation req))))
72 (defsubst fuel-con--make-connection (buffer)
73 (list :fuel-connection
76 (cons :completed (make-hash-table :weakness 'value))
77 (cons :buffer buffer)))
79 (defsubst fuel-con--connection-p (c)
80 (and (listp c) (eq (car c) :fuel-connection)))
82 (defsubst fuel-con--connection-requests (c)
83 (cdr (assoc :requests c)))
85 (defsubst fuel-con--connection-current-request (c)
86 (cdr (assoc :current c)))
88 (defun fuel-con--connection-clean-current-request (c)
89 (let* ((cell (assoc :current c))
92 (puthash (fuel-con--request-id req) req (cdr (assoc :completed c)))
95 (defsubst fuel-con--connection-completed-p (c id)
96 (gethash id (cdr (assoc :completed c))))
98 (defsubst fuel-con--connection-buffer (c)
99 (cdr (assoc :buffer c)))
101 (defun fuel-con--connection-pop-request (c)
102 (let ((reqs (assoc :requests c))
103 (current (assoc :current c)))
104 (setcdr current (prog1 (cadr reqs) (setcdr reqs (cddr reqs))))
105 (if (and (cdr current)
106 (fuel-con--request-deactivated-p (cdr current)))
107 (fuel-con--connection-pop-request c)
111 ;;; Connection setup:
113 (defun fuel-con--setup-connection (buffer)
115 (let ((conn (fuel-con--make-connection buffer)))
116 (fuel-con--setup-comint)
117 (setq fuel-con--connection conn)))
119 (defun fuel-con--setup-comint ()
120 (add-hook 'comint-redirect-filter-functions
121 'fuel-con--comint-redirect-filter t t)
122 (add-hook 'comint-redirect-hook
123 'fuel-con--comint-redirect-hook))
128 (defvar fuel-con--log-size 32000
129 "Maximum size of the Factor messages log.")
131 (defvar fuel-con--log-verbose-p t
132 "Log level for Factor messages.")
134 (define-derived-mode factor-messages-mode fundamental-mode "Factor Messages"
135 "Simple mode to log interactions with the factor listener"
136 (kill-all-local-variables)
137 (buffer-disable-undo)
138 (set (make-local-variable 'comint-redirect-subvert-readonly) t)
139 (add-hook 'after-change-functions
141 (let ((inhibit-read-only t))
142 (when (> b fuel-con--log-size)
143 (delete-region (point-min) b))))
145 (setq buffer-read-only t))
147 (defun fuel-con--log-buffer ()
148 (or (get-buffer "*factor messages*")
150 (set-buffer (get-buffer-create "*factor messages*"))
151 (factor-messages-mode)
154 (defun fuel-con--log-msg (type &rest args)
155 (with-current-buffer (fuel-con--log-buffer)
156 (let ((inhibit-read-only t))
157 (insert (format "\n%s: %s\n" type (apply 'format args))))))
159 (defsubst fuel-con--log-warn (&rest args)
160 (apply 'fuel-con--log-msg 'WARNING args))
162 (defsubst fuel-con--log-error (&rest args)
163 (apply 'fuel-con--log-msg 'ERROR args))
165 (defsubst fuel-con--log-info (&rest args)
166 (if fuel-con--log-verbose-p (apply 'fuel-con--log-msg 'INFO args) ""))
169 ;;; Requests handling:
171 (defun fuel-con--process-next (con)
172 (when (not (fuel-con--connection-current-request con))
173 (let* ((buffer (fuel-con--connection-buffer con))
174 (req (fuel-con--connection-pop-request con))
175 (str (and req (fuel-con--request-string req))))
176 (when (and buffer req str)
178 (when fuel-con--log-verbose-p
179 (with-current-buffer (fuel-con--log-buffer)
180 (let ((inhibit-read-only t))
181 (fuel-con--log-info "<%s>: %s" (fuel-con--request-id req) str))))
182 (comint-redirect-send-command str (fuel-con--log-buffer) nil t)))))
184 (defun fuel-con--process-completed-request (req)
185 (let ((str (fuel-con--request-output req))
186 (cont (fuel-con--request-continuation req))
187 (id (fuel-con--request-id req))
188 (rstr (fuel-con--request-string req))
189 (buffer (fuel-con--request-buffer req)))
191 (fuel-con--log-warn "<%s> Droping result for request %S (%s)"
194 (with-current-buffer (or buffer (current-buffer))
196 (fuel-con--log-info "<%s>: processed\n\t%s" id str))
197 (error (fuel-con--log-error "<%s>: continuation failed %S \n\t%s"
200 (defun fuel-con--comint-redirect-filter (str)
201 (if (not fuel-con--connection)
202 (fuel-con--log-error "No connection in buffer (%s)" str)
203 (let ((req (fuel-con--connection-current-request fuel-con--connection)))
204 (if (not req) (fuel-con--log-error "No current request (%s)" str)
205 (fuel-con--request-output req str)
206 (fuel-con--log-info "<%s>: in progress" (fuel-con--request-id req)))))
209 (defun fuel-con--comint-redirect-hook ()
210 (if (not fuel-con--connection)
211 (fuel-con--log-error "No connection in buffer")
212 (let ((req (fuel-con--connection-current-request fuel-con--connection)))
213 (if (not req) (fuel-con--log-error "No current request (%s)" str)
214 (fuel-con--process-completed-request req)
215 (fuel-con--connection-clean-current-request fuel-con--connection)))))
218 ;;; Message sending interface:
220 (defun fuel-con--send-string (buffer/proc str cont &optional sender-buffer)
222 (let ((con (fuel-con--get-connection buffer/proc)))
224 (error "FUEL: couldn't find connection"))
225 (let ((req (fuel-con--make-request str cont sender-buffer)))
226 (fuel-con--connection-queue-request con req)
227 (fuel-con--process-next con)
230 (defvar fuel-connection-timeout 30000
231 "Time limit, in msecs, blocking on synchronous evaluation requests")
233 (defun fuel-con--send-string/wait (buffer/proc str cont &optional timeout sbuf)
235 (let* ((con (fuel-con--get-connection buffer/proc))
236 (req (fuel-con--send-string buffer/proc str cont sbuf))
237 (id (and req (fuel-con--request-id req)))
238 (time (or timeout fuel-connection-timeout))
241 (while (and (> time 0)
242 (not (fuel-con--connection-completed-p con id)))
244 (setq time (- time step)))
246 (fuel-con--request-deactivate req)
250 (provide 'fuel-connection)
251 ;;; fuel-connection.el ends here