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3a993e3d MA |
1 | ;;; dbus.el --- Elisp bindings for D-Bus. |
2 | ||
ba318903 | 3 | ;; Copyright (C) 2007-2014 Free Software Foundation, Inc. |
3a993e3d MA |
4 | |
5 | ;; Author: Michael Albinus <michael.albinus@gmx.de> | |
6 | ;; Keywords: comm, hardware | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
874a927a | 10 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
3a993e3d | 11 | ;; it under the terms of the GNU General Public License as published by |
874a927a GM |
12 | ;; the Free Software Foundation, either version 3 of the License, or |
13 | ;; (at your option) any later version. | |
3a993e3d MA |
14 | |
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
874a927a | 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
3a993e3d MA |
22 | |
23 | ;;; Commentary: | |
24 | ||
25 | ;; This package provides language bindings for the D-Bus API. D-Bus | |
26 | ;; is a message bus system, a simple way for applications to talk to | |
27 | ;; one another. See <http://dbus.freedesktop.org/> for details. | |
28 | ||
29 | ;; Low-level language bindings are implemented in src/dbusbind.c. | |
30 | ||
dcbf5805 MA |
31 | ;; D-Bus support in the Emacs core can be disabled with configuration |
32 | ;; option "--without-dbus". | |
33 | ||
3a993e3d MA |
34 | ;;; Code: |
35 | ||
dcbf5805 MA |
36 | ;; Declare used subroutines and variables. |
37 | (declare-function dbus-message-internal "dbusbind.c") | |
ba6f7d86 | 38 | (declare-function dbus-init-bus "dbusbind.c") |
dcbf5805 MA |
39 | (defvar dbus-message-type-invalid) |
40 | (defvar dbus-message-type-method-call) | |
41 | (defvar dbus-message-type-method-return) | |
42 | (defvar dbus-message-type-error) | |
43 | (defvar dbus-message-type-signal) | |
6981d00a | 44 | (defvar dbus-debug) |
b172ed20 | 45 | (defvar dbus-registered-objects-table) |
6981d00a MA |
46 | |
47 | ;; Pacify byte compiler. | |
f58e0fd5 | 48 | (eval-when-compile (require 'cl-lib)) |
7bb7efbd | 49 | |
3a993e3d MA |
50 | (require 'xml) |
51 | ||
52 | (defconst dbus-service-dbus "org.freedesktop.DBus" | |
53 | "The bus name used to talk to the bus itself.") | |
54 | ||
55 | (defconst dbus-path-dbus "/org/freedesktop/DBus" | |
56 | "The object path used to talk to the bus itself.") | |
57 | ||
dcbf5805 MA |
58 | ;; Default D-Bus interfaces. |
59 | ||
3a993e3d | 60 | (defconst dbus-interface-dbus "org.freedesktop.DBus" |
dcbf5805 | 61 | "The interface exported by the service `dbus-service-dbus'.") |
3a993e3d | 62 | |
4ba11bcb | 63 | (defconst dbus-interface-peer (concat dbus-interface-dbus ".Peer") |
dcbf5805 MA |
64 | "The interface for peer objects. |
65 | See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-peer'.") | |
66 | ||
67 | ;; <interface name="org.freedesktop.DBus.Peer"> | |
68 | ;; <method name="Ping"> | |
69 | ;; </method> | |
70 | ;; <method name="GetMachineId"> | |
71 | ;; <arg name="machine_uuid" type="s" direction="out"/> | |
72 | ;; </method> | |
73 | ;; </interface> | |
4ba11bcb MA |
74 | |
75 | (defconst dbus-interface-introspectable | |
76 | (concat dbus-interface-dbus ".Introspectable") | |
dcbf5805 MA |
77 | "The interface supported by introspectable objects. |
78 | See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-introspectable'.") | |
3a993e3d | 79 | |
dcbf5805 MA |
80 | ;; <interface name="org.freedesktop.DBus.Introspectable"> |
81 | ;; <method name="Introspect"> | |
82 | ;; <arg name="data" type="s" direction="out"/> | |
83 | ;; </method> | |
84 | ;; </interface> | |
f636d3ca | 85 | |
dcbf5805 MA |
86 | (defconst dbus-interface-properties (concat dbus-interface-dbus ".Properties") |
87 | "The interface for property objects. | |
88 | See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties'.") | |
89 | ||
90 | ;; <interface name="org.freedesktop.DBus.Properties"> | |
91 | ;; <method name="Get"> | |
92 | ;; <arg name="interface" type="s" direction="in"/> | |
93 | ;; <arg name="propname" type="s" direction="in"/> | |
94 | ;; <arg name="value" type="v" direction="out"/> | |
95 | ;; </method> | |
96 | ;; <method name="Set"> | |
97 | ;; <arg name="interface" type="s" direction="in"/> | |
98 | ;; <arg name="propname" type="s" direction="in"/> | |
99 | ;; <arg name="value" type="v" direction="in"/> | |
100 | ;; </method> | |
101 | ;; <method name="GetAll"> | |
102 | ;; <arg name="interface" type="s" direction="in"/> | |
103 | ;; <arg name="props" type="a{sv}" direction="out"/> | |
104 | ;; </method> | |
105 | ;; <signal name="PropertiesChanged"> | |
106 | ;; <arg name="interface" type="s"/> | |
107 | ;; <arg name="changed_properties" type="a{sv}"/> | |
108 | ;; <arg name="invalidated_properties" type="as"/> | |
109 | ;; </signal> | |
110 | ;; </interface> | |
111 | ||
112 | (defconst dbus-interface-objectmanager | |
113 | (concat dbus-interface-dbus ".ObjectManager") | |
114 | "The object manager interface. | |
115 | See URL `http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-objectmanager'.") | |
116 | ||
117 | ;; <interface name="org.freedesktop.DBus.ObjectManager"> | |
118 | ;; <method name="GetManagedObjects"> | |
119 | ;; <arg name="object_paths_interfaces_and_properties" | |
120 | ;; type="a{oa{sa{sv}}}" direction="out"/> | |
121 | ;; </method> | |
122 | ;; <signal name="InterfacesAdded"> | |
123 | ;; <arg name="object_path" type="o"/> | |
124 | ;; <arg name="interfaces_and_properties" type="a{sa{sv}}"/> | |
125 | ;; </signal> | |
126 | ;; <signal name="InterfacesRemoved"> | |
127 | ;; <arg name="object_path" type="o"/> | |
128 | ;; <arg name="interfaces" type="as"/> | |
129 | ;; </signal> | |
130 | ;; </interface> | |
131 | ||
132 | ;; Emacs defaults. | |
65b7cb2c MA |
133 | (defconst dbus-service-emacs "org.gnu.Emacs" |
134 | "The well known service name of Emacs.") | |
135 | ||
136 | (defconst dbus-path-emacs "/org/gnu/Emacs" | |
dcbf5805 MA |
137 | "The object path namespace used by Emacs. |
138 | All object paths provided by the service `dbus-service-emacs' | |
139 | shall be subdirectories of this path.") | |
65b7cb2c | 140 | |
dcbf5805 MA |
141 | (defconst dbus-interface-emacs "org.gnu.Emacs" |
142 | "The interface namespace used by Emacs.") | |
98c38bfc | 143 | |
dcbf5805 | 144 | ;; D-Bus constants. |
98c38bfc | 145 | |
246a286b MA |
146 | (defmacro dbus-ignore-errors (&rest body) |
147 | "Execute BODY; signal D-Bus error when `dbus-debug' is non-nil. | |
148 | Otherwise, return result of last form in BODY, or all other errors." | |
f291fe60 | 149 | (declare (indent 0) (debug t)) |
246a286b MA |
150 | `(condition-case err |
151 | (progn ,@body) | |
152 | (dbus-error (when dbus-debug (signal (car err) (cdr err)))))) | |
246a286b MA |
153 | (font-lock-add-keywords 'emacs-lisp-mode '("\\<dbus-ignore-errors\\>")) |
154 | ||
d1069532 SM |
155 | (define-obsolete-variable-alias 'dbus-event-error-hooks |
156 | 'dbus-event-error-functions "24.3") | |
157 | (defvar dbus-event-error-functions nil | |
e12c189f | 158 | "Functions to be called when a D-Bus error happens in the event handler. |
f213fc09 | 159 | Every function must accept two arguments, the event and the error variable |
333f9019 | 160 | caught in `condition-case' by `dbus-error'.") |
e12c189f | 161 | |
5363d8ea | 162 | \f |
dcbf5805 | 163 | ;;; Basic D-Bus message functions. |
5363d8ea | 164 | |
98c38bfc MA |
165 | (defvar dbus-return-values-table (make-hash-table :test 'equal) |
166 | "Hash table for temporary storing arguments of reply messages. | |
dcbf5805 MA |
167 | A key in this hash table is a list (:serial BUS SERIAL), like in |
168 | `dbus-registered-objects-table'. BUS is either a Lisp symbol, | |
169 | `:system' or `:session', or a string denoting the bus address. | |
170 | SERIAL is the serial number of the reply message.") | |
171 | ||
172 | (defun dbus-call-method-handler (&rest args) | |
173 | "Handler for reply messages of asynchronous D-Bus message calls. | |
174 | It calls the function stored in `dbus-registered-objects-table'. | |
175 | The result will be made available in `dbus-return-values-table'." | |
176 | (puthash (list :serial | |
177 | (dbus-event-bus-name last-input-event) | |
178 | (dbus-event-serial-number last-input-event)) | |
179 | (if (= (length args) 1) (car args) args) | |
180 | dbus-return-values-table)) | |
181 | ||
182 | (defun dbus-call-method (bus service path interface method &rest args) | |
183 | "Call METHOD on the D-Bus BUS. | |
184 | ||
185 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
186 | denoting the bus address. | |
187 | ||
188 | SERVICE is the D-Bus service name to be used. PATH is the D-Bus | |
189 | object path SERVICE is registered at. INTERFACE is an interface | |
190 | offered by SERVICE. It must provide METHOD. | |
191 | ||
192 | If the parameter `:timeout' is given, the following integer TIMEOUT | |
193 | specifies the maximum number of milliseconds the method call must | |
194 | return. The default value is 25,000. If the method call doesn't | |
195 | return in time, a D-Bus error is raised. | |
196 | ||
197 | All other arguments ARGS are passed to METHOD as arguments. They are | |
198 | converted into D-Bus types via the following rules: | |
199 | ||
200 | t and nil => DBUS_TYPE_BOOLEAN | |
201 | number => DBUS_TYPE_UINT32 | |
202 | integer => DBUS_TYPE_INT32 | |
203 | float => DBUS_TYPE_DOUBLE | |
204 | string => DBUS_TYPE_STRING | |
205 | list => DBUS_TYPE_ARRAY | |
206 | ||
207 | All arguments can be preceded by a type symbol. For details about | |
208 | type symbols, see Info node `(dbus)Type Conversion'. | |
209 | ||
210 | `dbus-call-method' returns the resulting values of METHOD as a list of | |
211 | Lisp objects. The type conversion happens the other direction as for | |
212 | input arguments. It follows the mapping rules: | |
213 | ||
214 | DBUS_TYPE_BOOLEAN => t or nil | |
215 | DBUS_TYPE_BYTE => number | |
216 | DBUS_TYPE_UINT16 => number | |
217 | DBUS_TYPE_INT16 => integer | |
218 | DBUS_TYPE_UINT32 => number or float | |
219 | DBUS_TYPE_UNIX_FD => number or float | |
220 | DBUS_TYPE_INT32 => integer or float | |
221 | DBUS_TYPE_UINT64 => number or float | |
222 | DBUS_TYPE_INT64 => integer or float | |
223 | DBUS_TYPE_DOUBLE => float | |
224 | DBUS_TYPE_STRING => string | |
225 | DBUS_TYPE_OBJECT_PATH => string | |
226 | DBUS_TYPE_SIGNATURE => string | |
227 | DBUS_TYPE_ARRAY => list | |
228 | DBUS_TYPE_VARIANT => list | |
229 | DBUS_TYPE_STRUCT => list | |
230 | DBUS_TYPE_DICT_ENTRY => list | |
231 | ||
232 | Example: | |
233 | ||
234 | \(dbus-call-method | |
235 | :session \"org.gnome.seahorse\" \"/org/gnome/seahorse/keys/openpgp\" | |
236 | \"org.gnome.seahorse.Keys\" \"GetKeyField\" | |
237 | \"openpgp:657984B8C7A966DD\" \"simple-name\") | |
238 | ||
239 | => (t (\"Philip R. Zimmermann\")) | |
240 | ||
241 | If the result of the METHOD call is just one value, the converted Lisp | |
242 | object is returned instead of a list containing this single Lisp object. | |
243 | ||
244 | \(dbus-call-method | |
245 | :system \"org.freedesktop.Hal\" \"/org/freedesktop/Hal/devices/computer\" | |
246 | \"org.freedesktop.Hal.Device\" \"GetPropertyString\" | |
247 | \"system.kernel.machine\") | |
248 | ||
249 | => \"i686\"" | |
250 | ||
251 | (or (memq bus '(:system :session)) (stringp bus) | |
252 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
253 | (or (stringp service) | |
254 | (signal 'wrong-type-argument (list 'stringp service))) | |
255 | (or (stringp path) | |
256 | (signal 'wrong-type-argument (list 'stringp path))) | |
257 | (or (stringp interface) | |
258 | (signal 'wrong-type-argument (list 'stringp interface))) | |
259 | (or (stringp method) | |
260 | (signal 'wrong-type-argument (list 'stringp method))) | |
261 | ||
262 | (let ((timeout (plist-get args :timeout)) | |
26ea164c | 263 | (check-interval 0.001) |
dcbf5805 MA |
264 | (key |
265 | (apply | |
266 | 'dbus-message-internal dbus-message-type-method-call | |
267 | bus service path interface method 'dbus-call-method-handler args))) | |
205a7391 | 268 | |
dcbf5805 MA |
269 | ;; Wait until `dbus-call-method-handler' has put the result into |
270 | ;; `dbus-return-values-table'. If no timeout is given, use the | |
205a7391 | 271 | ;; default 25". Events which are not from D-Bus must be restored. |
ec518f1a MA |
272 | ;; `read-event' performs a redisplay. This must be suppressed; it |
273 | ;; hurts when reading D-Bus events asynchronously. | |
26ea164c DC |
274 | |
275 | ;; Work around bug#16775 by busy-waiting with gradual backoff for | |
276 | ;; dbus calls to complete. A better aproach would involve either | |
277 | ;; adding arbitrary wait condition support to read-event or | |
278 | ;; restructuring dbus as a kind of process object. Poll at most | |
279 | ;; about once per second for completion. | |
280 | ||
dcbf5805 MA |
281 | (with-timeout ((if timeout (/ timeout 1000.0) 25)) |
282 | (while (eq (gethash key dbus-return-values-table :ignore) :ignore) | |
26ea164c DC |
283 | (let ((event (let ((inhibit-redisplay t) unread-command-events) |
284 | (read-event nil nil check-interval)))) | |
285 | (when event | |
286 | (push event unread-command-events)) | |
287 | (when (< check-interval 1) | |
288 | (setf check-interval (* check-interval 1.05)))))) | |
dcbf5805 MA |
289 | |
290 | ;; Cleanup `dbus-return-values-table'. Return the result. | |
291 | (prog1 | |
292 | (gethash key dbus-return-values-table) | |
293 | (remhash key dbus-return-values-table)))) | |
294 | ||
295 | ;; `dbus-call-method' works non-blocking now. | |
296 | (defalias 'dbus-call-method-non-blocking 'dbus-call-method) | |
2a1e2476 | 297 | (make-obsolete 'dbus-call-method-non-blocking 'dbus-call-method "24.3") |
dcbf5805 MA |
298 | |
299 | (defun dbus-call-method-asynchronously | |
300 | (bus service path interface method handler &rest args) | |
301 | "Call METHOD on the D-Bus BUS asynchronously. | |
302 | ||
303 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
304 | denoting the bus address. | |
305 | ||
306 | SERVICE is the D-Bus service name to be used. PATH is the D-Bus | |
307 | object path SERVICE is registered at. INTERFACE is an interface | |
308 | offered by SERVICE. It must provide METHOD. | |
309 | ||
310 | HANDLER is a Lisp function, which is called when the corresponding | |
311 | return message has arrived. If HANDLER is nil, no return message | |
312 | will be expected. | |
313 | ||
314 | If the parameter `:timeout' is given, the following integer TIMEOUT | |
315 | specifies the maximum number of milliseconds the method call must | |
316 | return. The default value is 25,000. If the method call doesn't | |
317 | return in time, a D-Bus error is raised. | |
318 | ||
319 | All other arguments ARGS are passed to METHOD as arguments. They are | |
320 | converted into D-Bus types via the following rules: | |
321 | ||
322 | t and nil => DBUS_TYPE_BOOLEAN | |
323 | number => DBUS_TYPE_UINT32 | |
324 | integer => DBUS_TYPE_INT32 | |
325 | float => DBUS_TYPE_DOUBLE | |
326 | string => DBUS_TYPE_STRING | |
327 | list => DBUS_TYPE_ARRAY | |
328 | ||
329 | All arguments can be preceded by a type symbol. For details about | |
330 | type symbols, see Info node `(dbus)Type Conversion'. | |
331 | ||
332 | If HANDLER is a Lisp function, the function returns a key into the | |
333 | hash table `dbus-registered-objects-table'. The corresponding entry | |
334 | in the hash table is removed, when the return message has been arrived, | |
335 | and HANDLER is called. | |
336 | ||
337 | Example: | |
338 | ||
339 | \(dbus-call-method-asynchronously | |
340 | :system \"org.freedesktop.Hal\" \"/org/freedesktop/Hal/devices/computer\" | |
341 | \"org.freedesktop.Hal.Device\" \"GetPropertyString\" 'message | |
342 | \"system.kernel.machine\") | |
343 | ||
344 | => \(:serial :system 2) | |
345 | ||
346 | -| i686" | |
347 | ||
348 | (or (memq bus '(:system :session)) (stringp bus) | |
349 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
350 | (or (stringp service) | |
351 | (signal 'wrong-type-argument (list 'stringp service))) | |
352 | (or (stringp path) | |
353 | (signal 'wrong-type-argument (list 'stringp path))) | |
354 | (or (stringp interface) | |
355 | (signal 'wrong-type-argument (list 'stringp interface))) | |
356 | (or (stringp method) | |
357 | (signal 'wrong-type-argument (list 'stringp method))) | |
358 | (or (null handler) (functionp handler) | |
359 | (signal 'wrong-type-argument (list 'functionp handler))) | |
360 | ||
361 | (apply 'dbus-message-internal dbus-message-type-method-call | |
362 | bus service path interface method handler args)) | |
363 | ||
364 | (defun dbus-send-signal (bus service path interface signal &rest args) | |
365 | "Send signal SIGNAL on the D-Bus BUS. | |
366 | ||
367 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
368 | denoting the bus address. The signal is sent from the D-Bus object | |
369 | Emacs is registered at BUS. | |
370 | ||
371 | SERVICE is the D-Bus name SIGNAL is sent to. It can be either a known | |
372 | name or a unique name. If SERVICE is nil, the signal is sent as | |
373 | broadcast message. PATH is the D-Bus object path SIGNAL is sent from. | |
374 | INTERFACE is an interface available at PATH. It must provide signal | |
375 | SIGNAL. | |
376 | ||
377 | All other arguments ARGS are passed to SIGNAL as arguments. They are | |
378 | converted into D-Bus types via the following rules: | |
379 | ||
380 | t and nil => DBUS_TYPE_BOOLEAN | |
381 | number => DBUS_TYPE_UINT32 | |
382 | integer => DBUS_TYPE_INT32 | |
383 | float => DBUS_TYPE_DOUBLE | |
384 | string => DBUS_TYPE_STRING | |
385 | list => DBUS_TYPE_ARRAY | |
386 | ||
387 | All arguments can be preceded by a type symbol. For details about | |
388 | type symbols, see Info node `(dbus)Type Conversion'. | |
389 | ||
390 | Example: | |
391 | ||
392 | \(dbus-send-signal | |
393 | :session nil \"/org/gnu/Emacs\" \"org.gnu.Emacs.FileManager\" | |
394 | \"FileModified\" \"/home/albinus/.emacs\")" | |
395 | ||
396 | (or (memq bus '(:system :session)) (stringp bus) | |
397 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
398 | (or (null service) (stringp service) | |
399 | (signal 'wrong-type-argument (list 'stringp service))) | |
400 | (or (stringp path) | |
401 | (signal 'wrong-type-argument (list 'stringp path))) | |
402 | (or (stringp interface) | |
403 | (signal 'wrong-type-argument (list 'stringp interface))) | |
404 | (or (stringp signal) | |
405 | (signal 'wrong-type-argument (list 'stringp signal))) | |
406 | ||
407 | (apply 'dbus-message-internal dbus-message-type-signal | |
408 | bus service path interface signal args)) | |
409 | ||
410 | (defun dbus-method-return-internal (bus service serial &rest args) | |
411 | "Return for message SERIAL on the D-Bus BUS. | |
412 | This is an internal function, it shall not be used outside dbus.el." | |
413 | ||
414 | (or (memq bus '(:system :session)) (stringp bus) | |
415 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
416 | (or (stringp service) | |
417 | (signal 'wrong-type-argument (list 'stringp service))) | |
418 | (or (natnump serial) | |
419 | (signal 'wrong-type-argument (list 'natnump serial))) | |
420 | ||
421 | (apply 'dbus-message-internal dbus-message-type-method-return | |
422 | bus service serial args)) | |
423 | ||
424 | (defun dbus-method-error-internal (bus service serial &rest args) | |
425 | "Return error message for message SERIAL on the D-Bus BUS. | |
426 | This is an internal function, it shall not be used outside dbus.el." | |
427 | ||
428 | (or (memq bus '(:system :session)) (stringp bus) | |
429 | (signal 'wrong-type-argument (list 'keywordp bus))) | |
430 | (or (stringp service) | |
431 | (signal 'wrong-type-argument (list 'stringp service))) | |
432 | (or (natnump serial) | |
433 | (signal 'wrong-type-argument (list 'natnump serial))) | |
434 | ||
435 | (apply 'dbus-message-internal dbus-message-type-error | |
436 | bus service serial args)) | |
437 | ||
438 | \f | |
439 | ;;; Hash table of registered functions. | |
98c38bfc | 440 | |
ef6ce14c | 441 | (defun dbus-list-hash-table () |
e49d337b | 442 | "Returns all registered member registrations to D-Bus. |
ef6ce14c | 443 | The return value is a list, with elements of kind (KEY . VALUE). |
b172ed20 | 444 | See `dbus-registered-objects-table' for a description of the |
ef6ce14c MA |
445 | hash table." |
446 | (let (result) | |
447 | (maphash | |
4f91a816 | 448 | (lambda (key value) (add-to-list 'result (cons key value) 'append)) |
b172ed20 | 449 | dbus-registered-objects-table) |
ef6ce14c MA |
450 | result)) |
451 | ||
dcbf5805 MA |
452 | (defun dbus-setenv (bus variable value) |
453 | "Set the value of the BUS environment variable named VARIABLE to VALUE. | |
b172ed20 | 454 | |
dcbf5805 MA |
455 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
456 | denoting the bus address. Both VARIABLE and VALUE should be strings. | |
246a286b | 457 | |
dcbf5805 MA |
458 | Normally, services inherit the environment of the BUS daemon. This |
459 | function adds to or modifies that environment when activating services. | |
b172ed20 | 460 | |
dcbf5805 MA |
461 | Some bus instances, such as `:system', may disable setting the environment." |
462 | (dbus-call-method | |
463 | bus dbus-service-dbus dbus-path-dbus | |
464 | dbus-interface-dbus "UpdateActivationEnvironment" | |
465 | `(:array (:dict-entry ,variable ,value)))) | |
466 | ||
467 | (defun dbus-register-service (bus service &rest flags) | |
468 | "Register known name SERVICE on the D-Bus BUS. | |
469 | ||
470 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
471 | denoting the bus address. | |
472 | ||
473 | SERVICE is the D-Bus service name that should be registered. It must | |
474 | be a known name. | |
475 | ||
476 | FLAGS are keywords, which control how the service name is registered. | |
477 | The following keywords are recognized: | |
478 | ||
479 | `:allow-replacement': Allow another service to become the primary | |
480 | owner if requested. | |
481 | ||
482 | `:replace-existing': Request to replace the current primary owner. | |
483 | ||
484 | `:do-not-queue': If we can not become the primary owner do not place | |
485 | us in the queue. | |
486 | ||
487 | The function returns a keyword, indicating the result of the | |
488 | operation. One of the following keywords is returned: | |
489 | ||
490 | `:primary-owner': Service has become the primary owner of the | |
491 | requested name. | |
492 | ||
493 | `:in-queue': Service could not become the primary owner and has been | |
494 | placed in the queue. | |
495 | ||
496 | `:exists': Service is already in the queue. | |
497 | ||
498 | `:already-owner': Service is already the primary owner." | |
499 | ||
500 | ;; Add ObjectManager handler. | |
501 | (dbus-register-method | |
502 | bus service nil dbus-interface-objectmanager "GetManagedObjects" | |
503 | 'dbus-managed-objects-handler 'dont-register) | |
504 | ||
505 | (let ((arg 0) | |
506 | reply) | |
507 | (dolist (flag flags) | |
508 | (setq arg | |
509 | (+ arg | |
f58e0fd5 | 510 | (pcase flag |
dcbf5805 MA |
511 | (:allow-replacement 1) |
512 | (:replace-existing 2) | |
513 | (:do-not-queue 4) | |
f58e0fd5 | 514 | (_ (signal 'wrong-type-argument (list flag))))))) |
dcbf5805 MA |
515 | (setq reply (dbus-call-method |
516 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
517 | "RequestName" service arg)) | |
f58e0fd5 | 518 | (pcase reply |
dcbf5805 MA |
519 | (1 :primary-owner) |
520 | (2 :in-queue) | |
521 | (3 :exists) | |
522 | (4 :already-owner) | |
f58e0fd5 | 523 | (_ (signal 'dbus-error (list "Could not register service" service)))))) |
246a286b | 524 | |
c0a39702 MA |
525 | (defun dbus-unregister-service (bus service) |
526 | "Unregister all objects related to SERVICE from D-Bus BUS. | |
e73f184c | 527 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
5c0b4070 MA |
528 | denoting the bus address. SERVICE must be a known service name. |
529 | ||
530 | The function returns a keyword, indicating the result of the | |
531 | operation. One of the following keywords is returned: | |
532 | ||
b85eff45 | 533 | `:released': We successfully released the service. |
5c0b4070 MA |
534 | |
535 | `:non-existent': Service name does not exist on this bus. | |
536 | ||
537 | `:not-owner': We are neither the primary owner nor waiting in the | |
538 | queue of this service." | |
539 | ||
c0a39702 MA |
540 | (maphash |
541 | (lambda (key value) | |
b85eff45 MA |
542 | (unless (equal :serial (car key)) |
543 | (dolist (elt value) | |
544 | (ignore-errors | |
545 | (when (and (equal bus (cadr key)) (string-equal service (cadr elt))) | |
546 | (unless | |
547 | (puthash key (delete elt value) dbus-registered-objects-table) | |
548 | (remhash key dbus-registered-objects-table))))))) | |
c0a39702 | 549 | dbus-registered-objects-table) |
0a203b61 MA |
550 | (let ((reply (dbus-call-method |
551 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
552 | "ReleaseName" service))) | |
f58e0fd5 | 553 | (pcase reply |
0a203b61 MA |
554 | (1 :released) |
555 | (2 :non-existent) | |
556 | (3 :not-owner) | |
f58e0fd5 | 557 | (_ (signal 'dbus-error (list "Could not unregister service" service)))))) |
c0a39702 | 558 | |
dcbf5805 MA |
559 | (defun dbus-register-signal |
560 | (bus service path interface signal handler &rest args) | |
561 | "Register for a signal on the D-Bus BUS. | |
98c38bfc | 562 | |
dcbf5805 MA |
563 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
564 | denoting the bus address. | |
98c38bfc | 565 | |
dcbf5805 MA |
566 | SERVICE is the D-Bus service name used by the sending D-Bus object. |
567 | It can be either a known name or the unique name of the D-Bus object | |
568 | sending the signal. | |
569 | ||
570 | PATH is the D-Bus object path SERVICE is registered. INTERFACE | |
571 | is an interface offered by SERVICE. It must provide SIGNAL. | |
572 | HANDLER is a Lisp function to be called when the signal is | |
573 | received. It must accept as arguments the values SIGNAL is | |
574 | sending. | |
575 | ||
576 | SERVICE, PATH, INTERFACE and SIGNAL can be nil. This is | |
577 | interpreted as a wildcard for the respective argument. | |
578 | ||
579 | The remaining arguments ARGS can be keywords or keyword string pairs. | |
580 | The meaning is as follows: | |
581 | ||
582 | `:argN' STRING: | |
583 | `:pathN' STRING: This stands for the Nth argument of the | |
584 | signal. `:pathN' arguments can be used for object path wildcard | |
0ba2624f | 585 | matches as specified by D-Bus, while an `:argN' argument |
dcbf5805 MA |
586 | requires an exact match. |
587 | ||
588 | `:arg-namespace' STRING: Register for the signals, which first | |
589 | argument defines the service or interface namespace STRING. | |
590 | ||
591 | `:path-namespace' STRING: Register for the object path namespace | |
592 | STRING. All signals sent from an object path, which has STRING as | |
593 | the preceding string, are matched. This requires PATH to be nil. | |
594 | ||
595 | `:eavesdrop': Register for unicast signals which are not directed | |
596 | to the D-Bus object Emacs is registered at D-Bus BUS, if the | |
597 | security policy of BUS allows this. | |
598 | ||
599 | Example: | |
600 | ||
601 | \(defun my-signal-handler (device) | |
602 | (message \"Device %s added\" device)) | |
603 | ||
604 | \(dbus-register-signal | |
605 | :system \"org.freedesktop.Hal\" \"/org/freedesktop/Hal/Manager\" | |
606 | \"org.freedesktop.Hal.Manager\" \"DeviceAdded\" 'my-signal-handler) | |
607 | ||
608 | => \(\(:signal :system \"org.freedesktop.Hal.Manager\" \"DeviceAdded\") | |
609 | \(\"org.freedesktop.Hal\" \"/org/freedesktop/Hal/Manager\" my-signal-handler)) | |
610 | ||
611 | `dbus-register-signal' returns an object, which can be used in | |
612 | `dbus-unregister-object' for removing the registration." | |
613 | ||
614 | (let ((counter 0) | |
615 | (rule "type='signal'") | |
616 | uname key key1 value) | |
617 | ||
618 | ;; Retrieve unique name of service. If service is a known name, | |
619 | ;; we will register for the corresponding unique name, if any. | |
620 | ;; Signals are sent always with the unique name as sender. Note: | |
621 | ;; the unique name of `dbus-service-dbus' is that string itself. | |
622 | (if (and (stringp service) | |
623 | (not (zerop (length service))) | |
624 | (not (string-equal service dbus-service-dbus)) | |
625 | (not (string-match "^:" service))) | |
626 | (setq uname (dbus-get-name-owner bus service)) | |
627 | (setq uname service)) | |
628 | ||
629 | (setq rule (concat rule | |
630 | (when uname (format ",sender='%s'" uname)) | |
631 | (when interface (format ",interface='%s'" interface)) | |
632 | (when signal (format ",member='%s'" signal)) | |
633 | (when path (format ",path='%s'" path)))) | |
634 | ||
635 | ;; Add arguments to the rule. | |
636 | (if (or (stringp (car args)) (null (car args))) | |
637 | ;; As backward compatibility option, we allow just strings. | |
638 | (dolist (arg args) | |
639 | (if (stringp arg) | |
640 | (setq rule (concat rule (format ",arg%d='%s'" counter arg))) | |
641 | (if arg (signal 'wrong-type-argument (list "Wrong argument" arg)))) | |
642 | (setq counter (1+ counter))) | |
643 | ||
644 | ;; Parse keywords. | |
645 | (while args | |
646 | (setq | |
647 | key (car args) | |
648 | rule (concat | |
649 | rule | |
650 | (cond | |
651 | ;; `:arg0' .. `:arg63', `:path0' .. `:path63'. | |
652 | ((and (keywordp key) | |
653 | (string-match | |
654 | "^:\\(arg\\|path\\)\\([[:digit:]]+\\)$" | |
655 | (symbol-name key))) | |
656 | (setq counter (match-string 2 (symbol-name key)) | |
657 | args (cdr args) | |
658 | value (car args)) | |
659 | (unless (and (<= counter 63) (stringp value)) | |
660 | (signal 'wrong-type-argument | |
661 | (list "Wrong argument" key value))) | |
662 | (format | |
663 | ",arg%s%s='%s'" | |
664 | counter | |
665 | (if (string-equal (match-string 1 (symbol-name key)) "path") | |
666 | "path" "") | |
667 | value)) | |
668 | ;; `:arg-namespace', `:path-namespace'. | |
669 | ((and (keywordp key) | |
670 | (string-match | |
671 | "^:\\(arg\\|path\\)-namespace$" (symbol-name key))) | |
672 | (setq args (cdr args) | |
673 | value (car args)) | |
674 | (unless (stringp value) | |
675 | (signal 'wrong-type-argument | |
676 | (list "Wrong argument" key value))) | |
677 | (format | |
678 | ",%s='%s'" | |
679 | (if (string-equal (match-string 1 (symbol-name key)) "path") | |
680 | "path_namespace" "arg0namespace") | |
681 | value)) | |
682 | ;; `:eavesdrop'. | |
683 | ((eq key :eavesdrop) | |
684 | ",eavesdrop='true'") | |
685 | (t (signal 'wrong-type-argument (list "Wrong argument" key))))) | |
686 | args (cdr args)))) | |
687 | ||
688 | ;; Add the rule to the bus. | |
689 | (condition-case err | |
690 | (dbus-call-method | |
691 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
692 | "AddMatch" rule) | |
693 | (dbus-error | |
694 | (if (not (string-match "eavesdrop" rule)) | |
695 | (signal (car err) (cdr err)) | |
696 | ;; The D-Bus spec says we shall fall back to a rule without eavesdrop. | |
697 | (when dbus-debug (message "Removing eavesdrop from rule %s" rule)) | |
698 | (setq rule (replace-regexp-in-string ",eavesdrop='true'" "" rule)) | |
699 | (dbus-call-method | |
700 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
701 | "AddMatch" rule)))) | |
98c38bfc | 702 | |
dcbf5805 | 703 | (when dbus-debug (message "Matching rule \"%s\" created" rule)) |
98c38bfc | 704 | |
dcbf5805 MA |
705 | ;; Create a hash table entry. |
706 | (setq key (list :signal bus interface signal) | |
707 | key1 (list uname service path handler rule) | |
708 | value (gethash key dbus-registered-objects-table)) | |
709 | (unless (member key1 value) | |
710 | (puthash key (cons key1 value) dbus-registered-objects-table)) | |
98c38bfc | 711 | |
dcbf5805 MA |
712 | ;; Return the object. |
713 | (list key (list service path handler)))) | |
98c38bfc | 714 | |
dcbf5805 MA |
715 | (defun dbus-register-method |
716 | (bus service path interface method handler &optional dont-register-service) | |
717 | "Register for method METHOD on the D-Bus BUS. | |
718 | ||
719 | BUS is either a Lisp symbol, `:system' or `:session', or a string | |
720 | denoting the bus address. | |
721 | ||
722 | SERVICE is the D-Bus service name of the D-Bus object METHOD is | |
723 | registered for. It must be a known name (See discussion of | |
724 | DONT-REGISTER-SERVICE below). | |
725 | ||
726 | PATH is the D-Bus object path SERVICE is registered (See discussion of | |
727 | DONT-REGISTER-SERVICE below). INTERFACE is the interface offered by | |
728 | SERVICE. It must provide METHOD. | |
729 | ||
730 | HANDLER is a Lisp function to be called when a method call is | |
731 | received. It must accept the input arguments of METHOD. The return | |
732 | value of HANDLER is used for composing the returning D-Bus message. | |
733 | In case HANDLER shall return a reply message with an empty argument | |
734 | list, HANDLER must return the symbol `:ignore'. | |
735 | ||
736 | When DONT-REGISTER-SERVICE is non-nil, the known name SERVICE is not | |
737 | registered. This means that other D-Bus clients have no way of | |
738 | noticing the newly registered method. When interfaces are constructed | |
739 | incrementally by adding single methods or properties at a time, | |
740 | DONT-REGISTER-SERVICE can be used to prevent other clients from | |
741 | discovering the still incomplete interface." | |
742 | ||
743 | ;; Register SERVICE. | |
744 | (unless (or dont-register-service | |
745 | (member service (dbus-list-names bus))) | |
746 | (dbus-register-service bus service)) | |
747 | ||
748 | ;; Create a hash table entry. We use nil for the unique name, | |
749 | ;; because the method might be called from anybody. | |
750 | (let* ((key (list :method bus interface method)) | |
751 | (key1 (list nil service path handler)) | |
752 | (value (gethash key dbus-registered-objects-table))) | |
753 | ||
754 | (unless (member key1 value) | |
755 | (puthash key (cons key1 value) dbus-registered-objects-table)) | |
756 | ||
757 | ;; Return the object. | |
758 | (list key (list service path handler)))) | |
759 | ||
760 | (defun dbus-unregister-object (object) | |
761 | "Unregister OBJECT from D-Bus. | |
762 | OBJECT must be the result of a preceding `dbus-register-method', | |
763 | `dbus-register-property' or `dbus-register-signal' call. It | |
764 | returns `t' if OBJECT has been unregistered, `nil' otherwise. | |
765 | ||
766 | When OBJECT identifies the last method or property, which is | |
767 | registered for the respective service, Emacs releases its | |
768 | association to the service from D-Bus." | |
769 | ;; Check parameter. | |
770 | (unless (and (consp object) (not (null (car object))) (consp (cdr object))) | |
771 | (signal 'wrong-type-argument (list 'D-Bus object))) | |
772 | ||
773 | ;; Find the corresponding entry in the hash table. | |
774 | (let* ((key (car object)) | |
775 | (type (car key)) | |
776 | (bus (cadr key)) | |
777 | (value (cadr object)) | |
778 | (service (car value)) | |
779 | (entry (gethash key dbus-registered-objects-table)) | |
780 | ret) | |
781 | ;; key has the structure (TYPE BUS INTERFACE MEMBER). | |
782 | ;; value has the structure (SERVICE PATH [HANDLER]). | |
783 | ;; entry has the structure ((UNAME SERVICE PATH MEMBER [RULE]) ...). | |
784 | ;; MEMBER is either a string (the handler), or a cons cell (a | |
785 | ;; property value). UNAME and property values are not taken into | |
786 | ;; account for comparison. | |
787 | ||
788 | ;; Loop over the registered functions. | |
789 | (dolist (elt entry) | |
790 | (when (equal | |
791 | value | |
792 | (butlast (cdr elt) (- (length (cdr elt)) (length value)))) | |
793 | (setq ret t) | |
794 | ;; Compute new hash value. If it is empty, remove it from the | |
795 | ;; hash table. | |
796 | (unless (puthash key (delete elt entry) dbus-registered-objects-table) | |
797 | (remhash key dbus-registered-objects-table)) | |
798 | ;; Remove match rule of signals. | |
799 | (when (eq type :signal) | |
800 | (dbus-call-method | |
801 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus | |
802 | "RemoveMatch" (nth 4 elt))))) | |
803 | ||
804 | ;; Check, whether there is still a registered function or property | |
805 | ;; for the given service. If not, unregister the service from the | |
806 | ;; bus. | |
807 | (when (and service (memq type '(:method :property)) | |
808 | (not (catch :found | |
809 | (progn | |
810 | (maphash | |
811 | (lambda (k v) | |
812 | (dolist (e v) | |
813 | (ignore-errors | |
814 | (and | |
815 | ;; Bus. | |
816 | (equal bus (cadr k)) | |
817 | ;; Service. | |
818 | (string-equal service (cadr e)) | |
819 | ;; Non-empty object path. | |
f58e0fd5 | 820 | (cl-caddr e) |
dcbf5805 MA |
821 | (throw :found t))))) |
822 | dbus-registered-objects-table) | |
823 | nil)))) | |
824 | (dbus-unregister-service bus service)) | |
825 | ;; Return. | |
826 | ret)) | |
ef6ce14c | 827 | |
5363d8ea | 828 | \f |
82697a45 MA |
829 | ;;; D-Bus type conversion. |
830 | ||
831 | (defun dbus-string-to-byte-array (string) | |
832 | "Transforms STRING to list (:array :byte c1 :byte c2 ...). | |
833 | STRING shall be UTF8 coded." | |
d665fff0 MA |
834 | (if (zerop (length string)) |
835 | '(:array :signature "y") | |
836 | (let (result) | |
837 | (dolist (elt (string-to-list string) (append '(:array) result)) | |
838 | (setq result (append result (list :byte elt))))))) | |
82697a45 | 839 | |
b85eff45 | 840 | (defun dbus-byte-array-to-string (byte-array &optional multibyte) |
82697a45 | 841 | "Transforms BYTE-ARRAY into UTF8 coded string. |
81961e4c | 842 | BYTE-ARRAY must be a list of structure (c1 c2 ...), or a byte |
b85eff45 MA |
843 | array as produced by `dbus-string-to-byte-array'. The resulting |
844 | string is unibyte encoded, unless MULTIBYTE is non-nil." | |
81961e4c | 845 | (apply |
b85eff45 | 846 | (if multibyte 'string 'unibyte-string) |
81961e4c MA |
847 | (if (equal byte-array '(:array :signature "y")) |
848 | nil | |
849 | (let (result) | |
850 | (dolist (elt byte-array result) | |
851 | (when (characterp elt) (setq result (append result `(,elt))))))))) | |
82697a45 MA |
852 | |
853 | (defun dbus-escape-as-identifier (string) | |
854 | "Escape an arbitrary STRING so it follows the rules for a C identifier. | |
855 | The escaped string can be used as object path component, interface element | |
856 | component, bus name component or member name in D-Bus. | |
857 | ||
858 | The escaping consists of replacing all non-alphanumerics, and the | |
859 | first character if it's a digit, with an underscore and two | |
860 | lower-case hex digits: | |
861 | ||
862 | \"0123abc_xyz\\x01\\xff\" -> \"_30123abc_5fxyz_01_ff\" | |
863 | ||
864 | i.e. similar to URI encoding, but with \"_\" taking the role of \"%\", | |
865 | and a smaller allowed set. As a special case, \"\" is escaped to | |
866 | \"_\". | |
867 | ||
868 | Returns the escaped string. Algorithm taken from | |
b85eff45 | 869 | telepathy-glib's `tp_escape_as_identifier'." |
82697a45 MA |
870 | (if (zerop (length string)) |
871 | "_" | |
872 | (replace-regexp-in-string | |
873 | "^[0-9]\\|[^A-Za-z0-9]" | |
874 | (lambda (x) (format "_%2x" (aref x 0))) | |
875 | string))) | |
876 | ||
877 | (defun dbus-unescape-from-identifier (string) | |
b85eff45 MA |
878 | "Retrieve the original string from the encoded STRING as unibyte string. |
879 | STRING must have been encoded with `dbus-escape-as-identifier'." | |
82697a45 MA |
880 | (if (string-equal string "_") |
881 | "" | |
882 | (replace-regexp-in-string | |
883 | "_.." | |
81961e4c | 884 | (lambda (x) (byte-to-string (string-to-number (substring x 1) 16))) |
82697a45 MA |
885 | string))) |
886 | ||
887 | \f | |
5363d8ea MA |
888 | ;;; D-Bus events. |
889 | ||
3a993e3d MA |
890 | (defun dbus-check-event (event) |
891 | "Checks whether EVENT is a well formed D-Bus event. | |
892 | EVENT is a list which starts with symbol `dbus-event': | |
893 | ||
98c38bfc | 894 | (dbus-event BUS TYPE SERIAL SERVICE PATH INTERFACE MEMBER HANDLER &rest ARGS) |
3a993e3d | 895 | |
e49d337b | 896 | BUS identifies the D-Bus the message is coming from. It is |
e73f184c MA |
897 | either a Lisp symbol, `:system' or `:session', or a string |
898 | denoting the bus address. TYPE is the D-Bus message type which | |
899 | has caused the event, SERIAL is the serial number of the received | |
900 | D-Bus message. SERVICE and PATH are the unique name and the | |
901 | object path of the D-Bus object emitting the message. INTERFACE | |
902 | and MEMBER denote the message which has been sent. HANDLER is | |
903 | the function which has been registered for this message. ARGS | |
904 | are the arguments passed to HANDLER, when it is called during | |
905 | event handling in `dbus-handle-event'. | |
3a993e3d MA |
906 | |
907 | This function raises a `dbus-error' signal in case the event is | |
908 | not well formed." | |
909 | (when dbus-debug (message "DBus-Event %s" event)) | |
910 | (unless (and (listp event) | |
911 | (eq (car event) 'dbus-event) | |
5363d8ea | 912 | ;; Bus symbol. |
e73f184c MA |
913 | (or (symbolp (nth 1 event)) |
914 | (stringp (nth 1 event))) | |
98c38bfc MA |
915 | ;; Type. |
916 | (and (natnump (nth 2 event)) | |
917 | (< dbus-message-type-invalid (nth 2 event))) | |
e49d337b | 918 | ;; Serial. |
98c38bfc | 919 | (natnump (nth 3 event)) |
5363d8ea | 920 | ;; Service. |
98c38bfc | 921 | (or (= dbus-message-type-method-return (nth 2 event)) |
ba0b66b0 | 922 | (= dbus-message-type-error (nth 2 event)) |
98c38bfc | 923 | (stringp (nth 4 event))) |
e49d337b | 924 | ;; Object path. |
98c38bfc | 925 | (or (= dbus-message-type-method-return (nth 2 event)) |
ba0b66b0 | 926 | (= dbus-message-type-error (nth 2 event)) |
98c38bfc | 927 | (stringp (nth 5 event))) |
e49d337b | 928 | ;; Interface. |
98c38bfc | 929 | (or (= dbus-message-type-method-return (nth 2 event)) |
ba0b66b0 | 930 | (= dbus-message-type-error (nth 2 event)) |
98c38bfc | 931 | (stringp (nth 6 event))) |
e49d337b | 932 | ;; Member. |
98c38bfc | 933 | (or (= dbus-message-type-method-return (nth 2 event)) |
ba0b66b0 | 934 | (= dbus-message-type-error (nth 2 event)) |
98c38bfc | 935 | (stringp (nth 7 event))) |
ef6ce14c | 936 | ;; Handler. |
98c38bfc | 937 | (functionp (nth 8 event))) |
3a993e3d MA |
938 | (signal 'dbus-error (list "Not a valid D-Bus event" event)))) |
939 | ||
940 | ;;;###autoload | |
941 | (defun dbus-handle-event (event) | |
942 | "Handle events from the D-Bus. | |
5363d8ea | 943 | EVENT is a D-Bus event, see `dbus-check-event'. HANDLER, being |
98c38bfc | 944 | part of the event, is called with arguments ARGS. |
35b148ee | 945 | If the HANDLER returns a `dbus-error', it is propagated as return message." |
3a993e3d | 946 | (interactive "e") |
98c38bfc MA |
947 | (condition-case err |
948 | (let (result) | |
ba0b66b0 | 949 | ;; We ignore not well-formed events. |
98c38bfc | 950 | (dbus-check-event event) |
ba0b66b0 MA |
951 | ;; Error messages must be propagated. |
952 | (when (= dbus-message-type-error (nth 2 event)) | |
953 | (signal 'dbus-error (nthcdr 9 event))) | |
954 | ;; Apply the handler. | |
98c38bfc MA |
955 | (setq result (apply (nth 8 event) (nthcdr 9 event))) |
956 | ;; Return a message when it is a message call. | |
957 | (when (= dbus-message-type-method-call (nth 2 event)) | |
958 | (dbus-ignore-errors | |
3dec5c36 MA |
959 | (if (eq result :ignore) |
960 | (dbus-method-return-internal | |
dcbf5805 | 961 | (nth 1 event) (nth 4 event) (nth 3 event)) |
3dec5c36 | 962 | (apply 'dbus-method-return-internal |
dcbf5805 | 963 | (nth 1 event) (nth 4 event) (nth 3 event) |
3dec5c36 | 964 | (if (consp result) result (list result))))))) |
98c38bfc MA |
965 | ;; Error handling. |
966 | (dbus-error | |
967 | ;; Return an error message when it is a message call. | |
968 | (when (= dbus-message-type-method-call (nth 2 event)) | |
969 | (dbus-ignore-errors | |
970 | (dbus-method-error-internal | |
dcbf5805 | 971 | (nth 1 event) (nth 4 event) (nth 3 event) (cadr err)))) |
ba0b66b0 | 972 | ;; Propagate D-Bus error messages. |
d1069532 | 973 | (run-hook-with-args 'dbus-event-error-functions event err) |
ba0b66b0 MA |
974 | (when (or dbus-debug (= dbus-message-type-error (nth 2 event))) |
975 | (signal (car err) (cdr err)))))) | |
3a993e3d MA |
976 | |
977 | (defun dbus-event-bus-name (event) | |
978 | "Return the bus name the event is coming from. | |
e73f184c MA |
979 | The result is either a Lisp symbol, `:system' or `:session', or a |
980 | string denoting the bus address. EVENT is a D-Bus event, see | |
981 | `dbus-check-event'. This function raises a `dbus-error' signal | |
982 | in case the event is not well formed." | |
3a993e3d | 983 | (dbus-check-event event) |
ef6ce14c | 984 | (nth 1 event)) |
3a993e3d | 985 | |
98c38bfc MA |
986 | (defun dbus-event-message-type (event) |
987 | "Return the message type of the corresponding D-Bus message. | |
988 | The result is a number. EVENT is a D-Bus event, see | |
989 | `dbus-check-event'. This function raises a `dbus-error' signal | |
990 | in case the event is not well formed." | |
991 | (dbus-check-event event) | |
992 | (nth 2 event)) | |
993 | ||
e49d337b MA |
994 | (defun dbus-event-serial-number (event) |
995 | "Return the serial number of the corresponding D-Bus message. | |
98c38bfc MA |
996 | The result is a number. The serial number is needed for |
997 | generating a reply message. EVENT is a D-Bus event, see | |
998 | `dbus-check-event'. This function raises a `dbus-error' signal | |
999 | in case the event is not well formed." | |
e49d337b | 1000 | (dbus-check-event event) |
98c38bfc | 1001 | (nth 3 event)) |
e49d337b | 1002 | |
3a993e3d | 1003 | (defun dbus-event-service-name (event) |
5363d8ea | 1004 | "Return the name of the D-Bus object the event is coming from. |
3a993e3d MA |
1005 | The result is a string. EVENT is a D-Bus event, see `dbus-check-event'. |
1006 | This function raises a `dbus-error' signal in case the event is | |
1007 | not well formed." | |
1008 | (dbus-check-event event) | |
98c38bfc | 1009 | (nth 4 event)) |
3a993e3d MA |
1010 | |
1011 | (defun dbus-event-path-name (event) | |
1012 | "Return the object path of the D-Bus object the event is coming from. | |
1013 | The result is a string. EVENT is a D-Bus event, see `dbus-check-event'. | |
1014 | This function raises a `dbus-error' signal in case the event is | |
1015 | not well formed." | |
1016 | (dbus-check-event event) | |
98c38bfc | 1017 | (nth 5 event)) |
3a993e3d MA |
1018 | |
1019 | (defun dbus-event-interface-name (event) | |
1020 | "Return the interface name of the D-Bus object the event is coming from. | |
1021 | The result is a string. EVENT is a D-Bus event, see `dbus-check-event'. | |
1022 | This function raises a `dbus-error' signal in case the event is | |
1023 | not well formed." | |
1024 | (dbus-check-event event) | |
98c38bfc | 1025 | (nth 6 event)) |
3a993e3d MA |
1026 | |
1027 | (defun dbus-event-member-name (event) | |
1028 | "Return the member name the event is coming from. | |
58179cce | 1029 | It is either a signal name or a method name. The result is a |
3a993e3d MA |
1030 | string. EVENT is a D-Bus event, see `dbus-check-event'. This |
1031 | function raises a `dbus-error' signal in case the event is not | |
1032 | well formed." | |
1033 | (dbus-check-event event) | |
98c38bfc | 1034 | (nth 7 event)) |
5363d8ea MA |
1035 | |
1036 | \f | |
1037 | ;;; D-Bus registered names. | |
3a993e3d | 1038 | |
07e52e08 | 1039 | (defun dbus-list-activatable-names (&optional bus) |
3a993e3d | 1040 | "Return the D-Bus service names which can be activated as list. |
07e52e08 MA |
1041 | If BUS is left nil, `:system' is assumed. The result is a list |
1042 | of strings, which is `nil' when there are no activatable service | |
1043 | names at all." | |
246a286b MA |
1044 | (dbus-ignore-errors |
1045 | (dbus-call-method | |
07e52e08 | 1046 | (or bus :system) dbus-service-dbus |
246a286b | 1047 | dbus-path-dbus dbus-interface-dbus "ListActivatableNames"))) |
3a993e3d MA |
1048 | |
1049 | (defun dbus-list-names (bus) | |
1050 | "Return the service names registered at D-Bus BUS. | |
f636d3ca MA |
1051 | The result is a list of strings, which is `nil' when there are no |
1052 | registered service names at all. Well known names are strings | |
1053 | like \"org.freedesktop.DBus\". Names starting with \":\" are | |
1054 | unique names for services." | |
246a286b MA |
1055 | (dbus-ignore-errors |
1056 | (dbus-call-method | |
1057 | bus dbus-service-dbus dbus-path-dbus dbus-interface-dbus "ListNames"))) | |
3a993e3d MA |
1058 | |
1059 | (defun dbus-list-known-names (bus) | |
1060 | "Retrieve all services which correspond to a known name in BUS. | |
1061 | A service has a known name if it doesn't start with \":\"." | |
1062 | (let (result) | |
1063 | (dolist (name (dbus-list-names bus) result) | |
1064 | (unless (string-equal ":" (substring name 0 1)) | |
1065 | (add-to-list 'result name 'append))))) | |
1066 | ||
1067 | (defun dbus-list-queued-owners (bus service) | |
f636d3ca MA |
1068 | "Return the unique names registered at D-Bus BUS and queued for SERVICE. |
1069 | The result is a list of strings, or `nil' when there are no | |
1070 | queued name owners service names at all." | |
246a286b MA |
1071 | (dbus-ignore-errors |
1072 | (dbus-call-method | |
1073 | bus dbus-service-dbus dbus-path-dbus | |
1074 | dbus-interface-dbus "ListQueuedOwners" service))) | |
3a993e3d MA |
1075 | |
1076 | (defun dbus-get-name-owner (bus service) | |
1077 | "Return the name owner of SERVICE registered at D-Bus BUS. | |
f636d3ca | 1078 | The result is either a string, or `nil' if there is no name owner." |
246a286b MA |
1079 | (dbus-ignore-errors |
1080 | (dbus-call-method | |
1081 | bus dbus-service-dbus dbus-path-dbus | |
1082 | dbus-interface-dbus "GetNameOwner" service))) | |
3a993e3d | 1083 | |
93fb0645 MA |
1084 | (defun dbus-ping (bus service &optional timeout) |
1085 | "Check whether SERVICE is registered for D-Bus BUS. | |
1086 | TIMEOUT, a nonnegative integer, specifies the maximum number of | |
1087 | milliseconds `dbus-ping' must return. The default value is 25,000. | |
1088 | ||
1089 | Note, that this autoloads SERVICE if it is not running yet. If | |
1090 | it shall be checked whether SERVICE is already running, one shall | |
1091 | apply | |
1092 | ||
1093 | \(member service \(dbus-list-known-names bus))" | |
4ba11bcb MA |
1094 | ;; "Ping" raises a D-Bus error if SERVICE does not exist. |
1095 | ;; Otherwise, it returns silently with `nil'. | |
1096 | (condition-case nil | |
1097 | (not | |
93fb0645 MA |
1098 | (if (natnump timeout) |
1099 | (dbus-call-method | |
1100 | bus service dbus-path-dbus dbus-interface-peer | |
1101 | "Ping" :timeout timeout) | |
1102 | (dbus-call-method | |
1103 | bus service dbus-path-dbus dbus-interface-peer "Ping"))) | |
4ba11bcb MA |
1104 | (dbus-error nil))) |
1105 | ||
f636d3ca MA |
1106 | \f |
1107 | ;;; D-Bus introspection. | |
3a993e3d | 1108 | |
f636d3ca | 1109 | (defun dbus-introspect (bus service path) |
35b148ee | 1110 | "Return all interfaces and sub-nodes of SERVICE, |
f636d3ca MA |
1111 | registered at object path PATH at bus BUS. |
1112 | ||
e73f184c MA |
1113 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
1114 | denoting the bus address. SERVICE must be a known service name, | |
1115 | and PATH must be a valid object path. The last two parameters | |
1116 | are strings. The result, the introspection data, is a string in | |
1117 | XML format." | |
205a7391 | 1118 | ;; We don't want to raise errors. |
246a286b | 1119 | (dbus-ignore-errors |
dcbf5805 MA |
1120 | (dbus-call-method |
1121 | bus service path dbus-interface-introspectable "Introspect" | |
1122 | :timeout 1000))) | |
3a993e3d | 1123 | |
f636d3ca MA |
1124 | (defun dbus-introspect-xml (bus service path) |
1125 | "Return the introspection data of SERVICE in D-Bus BUS at object path PATH. | |
1126 | The data are a parsed list. The root object is a \"node\", | |
1127 | representing the object path PATH. The root object can contain | |
1128 | \"interface\" and further \"node\" objects." | |
1129 | ;; We don't want to raise errors. | |
1130 | (xml-node-name | |
1131 | (ignore-errors | |
1132 | (with-temp-buffer | |
1133 | (insert (dbus-introspect bus service path)) | |
1134 | (xml-parse-region (point-min) (point-max)))))) | |
1135 | ||
1136 | (defun dbus-introspect-get-attribute (object attribute) | |
1137 | "Return the ATTRIBUTE value of D-Bus introspection OBJECT. | |
1138 | ATTRIBUTE must be a string according to the attribute names in | |
1139 | the D-Bus specification." | |
1140 | (xml-get-attribute-or-nil object (intern attribute))) | |
1141 | ||
1142 | (defun dbus-introspect-get-node-names (bus service path) | |
1143 | "Return all node names of SERVICE in D-Bus BUS at object path PATH. | |
1144 | It returns a list of strings. The node names stand for further | |
1145 | object paths of the D-Bus service." | |
1146 | (let ((object (dbus-introspect-xml bus service path)) | |
1147 | result) | |
1148 | (dolist (elt (xml-get-children object 'node) result) | |
1149 | (add-to-list | |
1150 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1151 | ||
1152 | (defun dbus-introspect-get-all-nodes (bus service path) | |
1153 | "Return all node names of SERVICE in D-Bus BUS at object path PATH. | |
1154 | It returns a list of strings, which are further object paths of SERVICE." | |
1155 | (let ((result (list path))) | |
1156 | (dolist (elt | |
1157 | (dbus-introspect-get-node-names bus service path) | |
1158 | result) | |
1159 | (setq elt (expand-file-name elt path)) | |
1160 | (setq result | |
1161 | (append result (dbus-introspect-get-all-nodes bus service elt)))))) | |
1162 | ||
1163 | (defun dbus-introspect-get-interface-names (bus service path) | |
1164 | "Return all interface names of SERVICE in D-Bus BUS at object path PATH. | |
1165 | It returns a list of strings. | |
1166 | ||
1167 | There will be always the default interface | |
1168 | \"org.freedesktop.DBus.Introspectable\". Another default | |
1169 | interface is \"org.freedesktop.DBus.Properties\". If present, | |
1170 | \"interface\" objects can also have \"property\" objects as | |
1171 | children, beside \"method\" and \"signal\" objects." | |
1172 | (let ((object (dbus-introspect-xml bus service path)) | |
1173 | result) | |
1174 | (dolist (elt (xml-get-children object 'interface) result) | |
1175 | (add-to-list | |
1176 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1177 | ||
1178 | (defun dbus-introspect-get-interface (bus service path interface) | |
1179 | "Return the INTERFACE of SERVICE in D-Bus BUS at object path PATH. | |
1180 | The return value is an XML object. INTERFACE must be a string, | |
35b148ee JB |
1181 | element of the list returned by `dbus-introspect-get-interface-names'. |
1182 | The resulting \"interface\" object can contain \"method\", \"signal\", | |
f636d3ca MA |
1183 | \"property\" and \"annotation\" children." |
1184 | (let ((elt (xml-get-children | |
1185 | (dbus-introspect-xml bus service path) 'interface))) | |
1186 | (while (and elt | |
1187 | (not (string-equal | |
1188 | interface | |
1189 | (dbus-introspect-get-attribute (car elt) "name")))) | |
1190 | (setq elt (cdr elt))) | |
1191 | (car elt))) | |
1192 | ||
1193 | (defun dbus-introspect-get-method-names (bus service path interface) | |
1194 | "Return a list of strings of all method names of INTERFACE. | |
1195 | SERVICE is a service of D-Bus BUS at object path PATH." | |
1196 | (let ((object (dbus-introspect-get-interface bus service path interface)) | |
1197 | result) | |
1198 | (dolist (elt (xml-get-children object 'method) result) | |
1199 | (add-to-list | |
1200 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1201 | ||
1202 | (defun dbus-introspect-get-method (bus service path interface method) | |
1203 | "Return method METHOD of interface INTERFACE as XML object. | |
1204 | It must be located at SERVICE in D-Bus BUS at object path PATH. | |
1205 | METHOD must be a string, element of the list returned by | |
1206 | `dbus-introspect-get-method-names'. The resulting \"method\" | |
1207 | object can contain \"arg\" and \"annotation\" children." | |
1208 | (let ((elt (xml-get-children | |
1209 | (dbus-introspect-get-interface bus service path interface) | |
1210 | 'method))) | |
1211 | (while (and elt | |
1212 | (not (string-equal | |
1213 | method (dbus-introspect-get-attribute (car elt) "name")))) | |
1214 | (setq elt (cdr elt))) | |
1215 | (car elt))) | |
1216 | ||
1217 | (defun dbus-introspect-get-signal-names (bus service path interface) | |
1218 | "Return a list of strings of all signal names of INTERFACE. | |
1219 | SERVICE is a service of D-Bus BUS at object path PATH." | |
1220 | (let ((object (dbus-introspect-get-interface bus service path interface)) | |
1221 | result) | |
1222 | (dolist (elt (xml-get-children object 'signal) result) | |
1223 | (add-to-list | |
1224 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1225 | ||
1226 | (defun dbus-introspect-get-signal (bus service path interface signal) | |
1227 | "Return signal SIGNAL of interface INTERFACE as XML object. | |
1228 | It must be located at SERVICE in D-Bus BUS at object path PATH. | |
1229 | SIGNAL must be a string, element of the list returned by | |
1230 | `dbus-introspect-get-signal-names'. The resulting \"signal\" | |
1231 | object can contain \"arg\" and \"annotation\" children." | |
1232 | (let ((elt (xml-get-children | |
1233 | (dbus-introspect-get-interface bus service path interface) | |
1234 | 'signal))) | |
1235 | (while (and elt | |
1236 | (not (string-equal | |
1237 | signal (dbus-introspect-get-attribute (car elt) "name")))) | |
1238 | (setq elt (cdr elt))) | |
1239 | (car elt))) | |
1240 | ||
1241 | (defun dbus-introspect-get-property-names (bus service path interface) | |
1242 | "Return a list of strings of all property names of INTERFACE. | |
1243 | SERVICE is a service of D-Bus BUS at object path PATH." | |
1244 | (let ((object (dbus-introspect-get-interface bus service path interface)) | |
1245 | result) | |
1246 | (dolist (elt (xml-get-children object 'property) result) | |
1247 | (add-to-list | |
1248 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1249 | ||
1250 | (defun dbus-introspect-get-property (bus service path interface property) | |
1251 | "This function returns PROPERTY of INTERFACE as XML object. | |
1252 | It must be located at SERVICE in D-Bus BUS at object path PATH. | |
1253 | PROPERTY must be a string, element of the list returned by | |
1254 | `dbus-introspect-get-property-names'. The resulting PROPERTY | |
1255 | object can contain \"annotation\" children." | |
1256 | (let ((elt (xml-get-children | |
1257 | (dbus-introspect-get-interface bus service path interface) | |
1258 | 'property))) | |
1259 | (while (and elt | |
1260 | (not (string-equal | |
1261 | property | |
1262 | (dbus-introspect-get-attribute (car elt) "name")))) | |
1263 | (setq elt (cdr elt))) | |
1264 | (car elt))) | |
1265 | ||
1266 | (defun dbus-introspect-get-annotation-names | |
1267 | (bus service path interface &optional name) | |
1268 | "Return all annotation names as list of strings. | |
1269 | If NAME is `nil', the annotations are children of INTERFACE, | |
1270 | otherwise NAME must be a \"method\", \"signal\", or \"property\" | |
1271 | object, where the annotations belong to." | |
1272 | (let ((object | |
1273 | (if name | |
1274 | (or (dbus-introspect-get-method bus service path interface name) | |
1275 | (dbus-introspect-get-signal bus service path interface name) | |
1276 | (dbus-introspect-get-property bus service path interface name)) | |
1277 | (dbus-introspect-get-interface bus service path interface))) | |
1278 | result) | |
1279 | (dolist (elt (xml-get-children object 'annotation) result) | |
1280 | (add-to-list | |
1281 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1282 | ||
1283 | (defun dbus-introspect-get-annotation | |
1284 | (bus service path interface name annotation) | |
1285 | "Return ANNOTATION as XML object. | |
1286 | If NAME is `nil', ANNOTATION is a child of INTERFACE, otherwise | |
1287 | NAME must be the name of a \"method\", \"signal\", or | |
1288 | \"property\" object, where the ANNOTATION belongs to." | |
1289 | (let ((elt (xml-get-children | |
1290 | (if name | |
1291 | (or (dbus-introspect-get-method | |
1292 | bus service path interface name) | |
1293 | (dbus-introspect-get-signal | |
1294 | bus service path interface name) | |
1295 | (dbus-introspect-get-property | |
1296 | bus service path interface name)) | |
1297 | (dbus-introspect-get-interface bus service path interface)) | |
1298 | 'annotation))) | |
1299 | (while (and elt | |
1300 | (not (string-equal | |
1301 | annotation | |
1302 | (dbus-introspect-get-attribute (car elt) "name")))) | |
1303 | (setq elt (cdr elt))) | |
1304 | (car elt))) | |
1305 | ||
1306 | (defun dbus-introspect-get-argument-names (bus service path interface name) | |
1307 | "Return a list of all argument names as list of strings. | |
1308 | NAME must be a \"method\" or \"signal\" object. | |
1309 | ||
1310 | Argument names are optional, the function can return `nil' | |
1311 | therefore, even if the method or signal has arguments." | |
1312 | (let ((object | |
1313 | (or (dbus-introspect-get-method bus service path interface name) | |
1314 | (dbus-introspect-get-signal bus service path interface name))) | |
1315 | result) | |
1316 | (dolist (elt (xml-get-children object 'arg) result) | |
1317 | (add-to-list | |
1318 | 'result (dbus-introspect-get-attribute elt "name") 'append)))) | |
1319 | ||
1320 | (defun dbus-introspect-get-argument (bus service path interface name arg) | |
1321 | "Return argument ARG as XML object. | |
35b148ee JB |
1322 | NAME must be a \"method\" or \"signal\" object. ARG must be a string, |
1323 | element of the list returned by `dbus-introspect-get-argument-names'." | |
f636d3ca MA |
1324 | (let ((elt (xml-get-children |
1325 | (or (dbus-introspect-get-method bus service path interface name) | |
1326 | (dbus-introspect-get-signal bus service path interface name)) | |
1327 | 'arg))) | |
1328 | (while (and elt | |
1329 | (not (string-equal | |
1330 | arg (dbus-introspect-get-attribute (car elt) "name")))) | |
1331 | (setq elt (cdr elt))) | |
1332 | (car elt))) | |
1333 | ||
1334 | (defun dbus-introspect-get-signature | |
1335 | (bus service path interface name &optional direction) | |
1336 | "Return signature of a `method' or `signal', represented by NAME, as string. | |
1337 | If NAME is a `method', DIRECTION can be either \"in\" or \"out\". | |
1338 | If DIRECTION is `nil', \"in\" is assumed. | |
1339 | ||
1340 | If NAME is a `signal', and DIRECTION is non-`nil', DIRECTION must | |
1341 | be \"out\"." | |
1342 | ;; For methods, we use "in" as default direction. | |
1343 | (let ((object (or (dbus-introspect-get-method | |
1344 | bus service path interface name) | |
1345 | (dbus-introspect-get-signal | |
1346 | bus service path interface name)))) | |
1347 | (when (and (string-equal | |
1348 | "method" (dbus-introspect-get-attribute object "name")) | |
1349 | (not (stringp direction))) | |
1350 | (setq direction "in")) | |
1351 | ;; In signals, no direction is given. | |
1352 | (when (string-equal "signal" (dbus-introspect-get-attribute object "name")) | |
1353 | (setq direction nil)) | |
1354 | ;; Collect the signatures. | |
1355 | (mapconcat | |
4f91a816 SM |
1356 | (lambda (x) |
1357 | (let ((arg (dbus-introspect-get-argument | |
1358 | bus service path interface name x))) | |
1359 | (if (or (not (stringp direction)) | |
1360 | (string-equal | |
1361 | direction | |
1362 | (dbus-introspect-get-attribute arg "direction"))) | |
1363 | (dbus-introspect-get-attribute arg "type") | |
1364 | ""))) | |
f636d3ca MA |
1365 | (dbus-introspect-get-argument-names bus service path interface name) |
1366 | ""))) | |
3a993e3d | 1367 | |
f636d3ca MA |
1368 | \f |
1369 | ;;; D-Bus properties. | |
3a993e3d | 1370 | |
f636d3ca MA |
1371 | (defun dbus-get-property (bus service path interface property) |
1372 | "Return the value of PROPERTY of INTERFACE. | |
1373 | It will be checked at BUS, SERVICE, PATH. The result can be any | |
1374 | valid D-Bus value, or `nil' if there is no PROPERTY." | |
246a286b | 1375 | (dbus-ignore-errors |
dcbf5805 MA |
1376 | ;; "Get" returns a variant, so we must use the `car'. |
1377 | (car | |
1378 | (dbus-call-method | |
1379 | bus service path dbus-interface-properties | |
1380 | "Get" :timeout 500 interface property)))) | |
f636d3ca MA |
1381 | |
1382 | (defun dbus-set-property (bus service path interface property value) | |
1383 | "Set value of PROPERTY of INTERFACE to VALUE. | |
1384 | It will be checked at BUS, SERVICE, PATH. When the value has | |
1385 | been set successful, the result is VALUE. Otherwise, `nil' is | |
1386 | returned." | |
1387 | (dbus-ignore-errors | |
dcbf5805 MA |
1388 | ;; "Set" requires a variant. |
1389 | (dbus-call-method | |
1390 | bus service path dbus-interface-properties | |
1391 | "Set" :timeout 500 interface property (list :variant value)) | |
1392 | ;; Return VALUE. | |
1393 | (dbus-get-property bus service path interface property))) | |
f636d3ca MA |
1394 | |
1395 | (defun dbus-get-all-properties (bus service path interface) | |
1396 | "Return all properties of INTERFACE at BUS, SERVICE, PATH. | |
1397 | The result is a list of entries. Every entry is a cons of the | |
1398 | name of the property, and its value. If there are no properties, | |
1399 | `nil' is returned." | |
f636d3ca | 1400 | (dbus-ignore-errors |
b172ed20 | 1401 | ;; "GetAll" returns "a{sv}". |
f636d3ca | 1402 | (let (result) |
b172ed20 | 1403 | (dolist (dict |
dcbf5805 | 1404 | (dbus-call-method |
b172ed20 MA |
1405 | bus service path dbus-interface-properties |
1406 | "GetAll" :timeout 500 interface) | |
f636d3ca | 1407 | result) |
f58e0fd5 | 1408 | (add-to-list 'result (cons (car dict) (cl-caadr dict)) 'append))))) |
b172ed20 MA |
1409 | |
1410 | (defun dbus-register-property | |
6388924a MA |
1411 | (bus service path interface property access value |
1412 | &optional emits-signal dont-register-service) | |
b172ed20 MA |
1413 | "Register property PROPERTY on the D-Bus BUS. |
1414 | ||
e73f184c MA |
1415 | BUS is either a Lisp symbol, `:system' or `:session', or a string |
1416 | denoting the bus address. | |
b172ed20 MA |
1417 | |
1418 | SERVICE is the D-Bus service name of the D-Bus. It must be a | |
6388924a MA |
1419 | known name (See discussion of DONT-REGISTER-SERVICE below). |
1420 | ||
1421 | PATH is the D-Bus object path SERVICE is registered (See | |
1422 | discussion of DONT-REGISTER-SERVICE below). INTERFACE is the | |
1423 | name of the interface used at PATH, PROPERTY is the name of the | |
1424 | property of INTERFACE. ACCESS indicates, whether the property | |
1425 | can be changed by other services via D-Bus. It must be either | |
1426 | the symbol `:read' or `:readwrite'. VALUE is the initial value | |
1427 | of the property, it can be of any valid type (see | |
b172ed20 MA |
1428 | `dbus-call-method' for details). |
1429 | ||
1430 | If PROPERTY already exists on PATH, it will be overwritten. For | |
1431 | properties with access type `:read' this is the only way to | |
1432 | change their values. Properties with access type `:readwrite' | |
1433 | can be changed by `dbus-set-property'. | |
1434 | ||
1435 | The interface \"org.freedesktop.DBus.Properties\" is added to | |
1436 | PATH, including a default handler for the \"Get\", \"GetAll\" and | |
b1ce08da MA |
1437 | \"Set\" methods of this interface. When EMITS-SIGNAL is non-nil, |
1438 | the signal \"PropertiesChanged\" is sent when the property is | |
6388924a MA |
1439 | changed by `dbus-set-property'. |
1440 | ||
1441 | When DONT-REGISTER-SERVICE is non-nil, the known name SERVICE is | |
1442 | not registered. This means that other D-Bus clients have no way | |
1443 | of noticing the newly registered property. When interfaces are | |
1444 | constructed incrementally by adding single methods or properties | |
1445 | at a time, DONT-REGISTER-SERVICE can be used to prevent other | |
1446 | clients from discovering the still incomplete interface." | |
b172ed20 | 1447 | (unless (member access '(:read :readwrite)) |
dcbf5805 | 1448 | (signal 'wrong-type-argument (list "Access type invalid" access))) |
b172ed20 | 1449 | |
0a203b61 | 1450 | ;; Add handlers for the three property-related methods. |
b172ed20 | 1451 | (dbus-register-method |
0a203b61 | 1452 | bus service path dbus-interface-properties "Get" |
1a27c64e | 1453 | 'dbus-property-handler 'dont-register) |
b172ed20 | 1454 | (dbus-register-method |
1a27c64e MA |
1455 | bus service path dbus-interface-properties "GetAll" |
1456 | 'dbus-property-handler 'dont-register) | |
b172ed20 | 1457 | (dbus-register-method |
1a27c64e MA |
1458 | bus service path dbus-interface-properties "Set" |
1459 | 'dbus-property-handler 'dont-register) | |
0a203b61 | 1460 | |
dcbf5805 MA |
1461 | ;; Register SERVICE. |
1462 | (unless (or dont-register-service (member service (dbus-list-names bus))) | |
0a203b61 | 1463 | (dbus-register-service bus service)) |
b172ed20 | 1464 | |
b1ce08da MA |
1465 | ;; Send the PropertiesChanged signal. |
1466 | (when emits-signal | |
1467 | (dbus-send-signal | |
1468 | bus service path dbus-interface-properties "PropertiesChanged" | |
dcbf5805 | 1469 | `((:dict-entry ,property (:variant ,value))) |
b1ce08da MA |
1470 | '(:array))) |
1471 | ||
b172ed20 MA |
1472 | ;; Create a hash table entry. We use nil for the unique name, |
1473 | ;; because the property might be accessed from anybody. | |
dcbf5805 | 1474 | (let ((key (list :property bus interface property)) |
b1ce08da MA |
1475 | (val |
1476 | (list | |
1477 | (list | |
1478 | nil service path | |
1479 | (cons | |
1480 | (if emits-signal (list access :emits-signal) (list access)) | |
1481 | value))))) | |
b172ed20 MA |
1482 | (puthash key val dbus-registered-objects-table) |
1483 | ||
1484 | ;; Return the object. | |
1485 | (list key (list service path)))) | |
1486 | ||
1487 | (defun dbus-property-handler (&rest args) | |
35b148ee | 1488 | "Default handler for the \"org.freedesktop.DBus.Properties\" interface. |
dcbf5805 | 1489 | It will be registered for all objects created by `dbus-register-property'." |
b172ed20 | 1490 | (let ((bus (dbus-event-bus-name last-input-event)) |
b1ce08da | 1491 | (service (dbus-event-service-name last-input-event)) |
b172ed20 MA |
1492 | (path (dbus-event-path-name last-input-event)) |
1493 | (method (dbus-event-member-name last-input-event)) | |
1494 | (interface (car args)) | |
1495 | (property (cadr args))) | |
1496 | (cond | |
1497 | ;; "Get" returns a variant. | |
1498 | ((string-equal method "Get") | |
dcbf5805 | 1499 | (let ((entry (gethash (list :property bus interface property) |
b1ce08da MA |
1500 | dbus-registered-objects-table))) |
1501 | (when (string-equal path (nth 2 (car entry))) | |
dcbf5805 | 1502 | `((:variant ,(cdar (last (car entry)))))))) |
b172ed20 MA |
1503 | |
1504 | ;; "Set" expects a variant. | |
1505 | ((string-equal method "Set") | |
b1ce08da | 1506 | (let* ((value (caar (cddr args))) |
dcbf5805 | 1507 | (entry (gethash (list :property bus interface property) |
b1ce08da MA |
1508 | dbus-registered-objects-table)) |
1509 | ;; The value of the hash table is a list; in case of | |
1510 | ;; properties it contains just one element (UNAME SERVICE | |
1511 | ;; PATH OBJECT). OBJECT is a cons cell of a list, which | |
1512 | ;; contains a list of annotations (like :read, | |
1513 | ;; :read-write, :emits-signal), and the value of the | |
1514 | ;; property. | |
1515 | (object (car (last (car entry))))) | |
1516 | (unless (consp object) | |
b172ed20 MA |
1517 | (signal 'dbus-error |
1518 | (list "Property not registered at path" property path))) | |
b1ce08da | 1519 | (unless (member :readwrite (car object)) |
b172ed20 MA |
1520 | (signal 'dbus-error |
1521 | (list "Property not writable at path" property path))) | |
dcbf5805 | 1522 | (puthash (list :property bus interface property) |
b1ce08da MA |
1523 | (list (append (butlast (car entry)) |
1524 | (list (cons (car object) value)))) | |
b172ed20 | 1525 | dbus-registered-objects-table) |
b1ce08da MA |
1526 | ;; Send the "PropertiesChanged" signal. |
1527 | (when (member :emits-signal (car object)) | |
1528 | (dbus-send-signal | |
1529 | bus service path dbus-interface-properties "PropertiesChanged" | |
dcbf5805 | 1530 | `((:dict-entry ,property (:variant ,value))) |
b1ce08da MA |
1531 | '(:array))) |
1532 | ;; Return empty reply. | |
b172ed20 MA |
1533 | :ignore)) |
1534 | ||
1535 | ;; "GetAll" returns "a{sv}". | |
1536 | ((string-equal method "GetAll") | |
1537 | (let (result) | |
1538 | (maphash | |
1539 | (lambda (key val) | |
dcbf5805 | 1540 | (when (and (equal (butlast key) (list :property bus interface)) |
b172ed20 | 1541 | (string-equal path (nth 2 (car val))) |
31bb373f | 1542 | (not (functionp (car (last (car val)))))) |
b172ed20 MA |
1543 | (add-to-list |
1544 | 'result | |
1545 | (list :dict-entry | |
1546 | (car (last key)) | |
1547 | (list :variant (cdar (last (car val)))))))) | |
1548 | dbus-registered-objects-table) | |
052e28ac MA |
1549 | ;; Return the result, or an empty array. |
1550 | (list :array (or result '(:signature "{sv}")))))))) | |
b172ed20 | 1551 | |
dcbf5805 MA |
1552 | \f |
1553 | ;;; D-Bus object manager. | |
1554 | ||
1555 | (defun dbus-get-all-managed-objects (bus service path) | |
1556 | "Return all objects at BUS, SERVICE, PATH, and the children of PATH. | |
1557 | The result is a list of objects. Every object is a cons of an | |
1558 | existing path name, and the list of available interface objects. | |
1559 | An interface object is another cons, which car is the interface | |
1560 | name, and the cdr is the list of properties as returned by | |
205a7391 | 1561 | `dbus-get-all-properties' for that path and interface. Example: |
dcbf5805 MA |
1562 | |
1563 | \(dbus-get-all-managed-objects :session \"org.gnome.SettingsDaemon\" \"/\") | |
1564 | ||
1565 | => \(\(\"/org/gnome/SettingsDaemon/MediaKeys\" | |
1566 | \(\"org.gnome.SettingsDaemon.MediaKeys\") | |
1567 | \(\"org.freedesktop.DBus.Peer\") | |
1568 | \(\"org.freedesktop.DBus.Introspectable\") | |
1569 | \(\"org.freedesktop.DBus.Properties\") | |
1570 | \(\"org.freedesktop.DBus.ObjectManager\")) | |
1571 | \(\"/org/gnome/SettingsDaemon/Power\" | |
1572 | \(\"org.gnome.SettingsDaemon.Power.Keyboard\") | |
1573 | \(\"org.gnome.SettingsDaemon.Power.Screen\") | |
1574 | \(\"org.gnome.SettingsDaemon.Power\" | |
1575 | \(\"Icon\" . \". GThemedIcon battery-full-charged-symbolic \") | |
1576 | \(\"Tooltip\" . \"Laptop battery is charged\")) | |
1577 | \(\"org.freedesktop.DBus.Peer\") | |
1578 | \(\"org.freedesktop.DBus.Introspectable\") | |
1579 | \(\"org.freedesktop.DBus.Properties\") | |
1580 | \(\"org.freedesktop.DBus.ObjectManager\")) | |
1581 | ...) | |
1582 | ||
1583 | If possible, \"org.freedesktop.DBus.ObjectManager.GetManagedObjects\" | |
1584 | is used for retrieving the information. Otherwise, the information | |
1585 | is collected via \"org.freedesktop.DBus.Introspectable.Introspect\" | |
1586 | and \"org.freedesktop.DBus.Properties.GetAll\", which is slow." | |
1587 | (let ((result | |
1588 | ;; Direct call. Fails, if the target does not support the | |
1589 | ;; object manager interface. | |
1590 | (dbus-ignore-errors | |
1591 | (dbus-call-method | |
1592 | bus service path dbus-interface-objectmanager | |
1593 | "GetManagedObjects" :timeout 1000)))) | |
1594 | ||
1595 | (if result | |
1596 | ;; Massage the returned structure. | |
1597 | (dolist (entry result result) | |
1598 | ;; "a{oa{sa{sv}}}". | |
1599 | (dolist (entry1 (cdr entry)) | |
1600 | ;; "a{sa{sv}}". | |
1601 | (dolist (entry2 entry1) | |
1602 | ;; "a{sv}". | |
1603 | (if (cadr entry2) | |
1604 | ;; "sv". | |
1605 | (dolist (entry3 (cadr entry2)) | |
f58e0fd5 | 1606 | (setcdr entry3 (cl-caadr entry3))) |
dcbf5805 MA |
1607 | (setcdr entry2 nil))))) |
1608 | ||
1609 | ;; Fallback: collect the information. Slooow! | |
1610 | (dolist (object | |
1611 | (dbus-introspect-get-all-nodes bus service path) | |
1612 | result) | |
1613 | (let (result1) | |
1614 | (dolist | |
1615 | (interface | |
1616 | (dbus-introspect-get-interface-names bus service object) | |
1617 | result1) | |
1618 | (add-to-list | |
1619 | 'result1 | |
1620 | (cons interface | |
1621 | (dbus-get-all-properties bus service object interface)))) | |
1622 | (when result1 | |
1623 | (add-to-list 'result (cons object result1)))))))) | |
1624 | ||
1625 | (defun dbus-managed-objects-handler () | |
1626 | "Default handler for the \"org.freedesktop.DBus.ObjectManager\" interface. | |
1627 | It will be registered for all objects created by `dbus-register-method'." | |
1628 | (let* ((last-input-event last-input-event) | |
1629 | (bus (dbus-event-bus-name last-input-event)) | |
dcbf5805 MA |
1630 | (path (dbus-event-path-name last-input-event))) |
1631 | ;; "GetManagedObjects" returns "a{oa{sa{sv}}}". | |
1632 | (let (interfaces result) | |
1633 | ||
1634 | ;; Check for object path wildcard interfaces. | |
1635 | (maphash | |
1636 | (lambda (key val) | |
1637 | (when (and (equal (butlast key 2) (list :method bus)) | |
1638 | (null (nth 2 (car-safe val)))) | |
1639 | (add-to-list 'interfaces (nth 2 key)))) | |
1640 | dbus-registered-objects-table) | |
1641 | ||
1642 | ;; Check all registered object paths. | |
1643 | (maphash | |
1644 | (lambda (key val) | |
6c42fc3e | 1645 | (let ((object (or (nth 2 (car-safe val)) ""))) |
dcbf5805 MA |
1646 | (when (and (equal (butlast key 2) (list :method bus)) |
1647 | (string-prefix-p path object)) | |
1648 | (dolist (interface (cons (nth 2 key) interfaces)) | |
1649 | (unless (assoc object result) | |
1650 | (add-to-list 'result (list object))) | |
1651 | (unless (assoc interface (cdr (assoc object result))) | |
1652 | (setcdr | |
1653 | (assoc object result) | |
1654 | (append | |
1655 | (list (cons | |
1656 | interface | |
1657 | ;; We simulate "org.freedesktop.DBus.Properties.GetAll" | |
1658 | ;; by using an appropriate D-Bus event. | |
1659 | (let ((last-input-event | |
1660 | (append | |
1661 | (butlast last-input-event 4) | |
1662 | (list object dbus-interface-properties | |
1663 | "GetAll" 'dbus-property-handler)))) | |
1664 | (dbus-property-handler interface)))) | |
1665 | (cdr (assoc object result))))))))) | |
1666 | dbus-registered-objects-table) | |
1667 | ||
1668 | ;; Return the result, or an empty array. | |
1669 | (list | |
1670 | :array | |
1671 | (or | |
1672 | (mapcar | |
1673 | (lambda (x) | |
1674 | (list | |
1675 | :dict-entry :object-path (car x) | |
1676 | (cons :array (mapcar (lambda (y) (cons :dict-entry y)) (cdr x))))) | |
1677 | result) | |
1678 | '(:signature "{oa{sa{sv}}}")))))) | |
1679 | ||
b172ed20 | 1680 | \f |
dcbf5805 | 1681 | ;; Initialize `:system' and `:session' buses. This adds their file |
720c7cd6 MA |
1682 | ;; descriptors to input_wait_mask, in order to detect incoming |
1683 | ;; messages immediately. | |
9e846523 MA |
1684 | (when (featurep 'dbusbind) |
1685 | (dbus-ignore-errors | |
dcbf5805 MA |
1686 | (dbus-init-bus :system)) |
1687 | (dbus-ignore-errors | |
9e846523 | 1688 | (dbus-init-bus :session))) |
720c7cd6 | 1689 | |
3a993e3d MA |
1690 | (provide 'dbus) |
1691 | ||
dcbf5805 MA |
1692 | ;;; TODO: |
1693 | ||
1694 | ;; * Implement org.freedesktop.DBus.ObjectManager.InterfacesAdded and | |
1695 | ;; org.freedesktop.DBus.ObjectManager.InterfacesRemoved. | |
1696 | ||
3a993e3d | 1697 | ;;; dbus.el ends here |