aboutsummaryrefslogtreecommitdiff
path: root/src/notifier.c
blob: 9835d4f7fbd61a2d0238c036da6dd440b3b3ef2f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
/*
 * Copyright 2014 Canonical Ltd.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 3, as published
 * by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranties of
 * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors:
 *   Charles Kerr <charles.kerr@canonical.com>
 */

#include "dbus-battery.h"
#include "dbus-shared.h"
#include "notifier.h"

#include <libnotify/notify.h>

#include <glib/gi18n.h>

typedef enum
{
  POWER_LEVEL_CRITICAL,
  POWER_LEVEL_VERY_LOW,
  POWER_LEVEL_LOW,
  POWER_LEVEL_OK
}
PowerLevel;

/**
***  GObject Properties
**/

enum
{
  PROP_0,
  PROP_BATTERY,
  LAST_PROP
};

#define PROP_BATTERY_NAME "battery"

static GParamSpec * properties[LAST_PROP];

static int instance_count = 0;

/**
***
**/

typedef struct
{
  /* The battery we're currently watching.
     This may be a physical battery or it may be an aggregated
     battery from multiple batteries present on the device.
     See indicator_power_service_choose_primary_device() and
     bug #880881 */
  IndicatorPowerDevice * battery;
  PowerLevel power_level;
  gboolean discharging;

  NotifyNotification * notify_notification;

  GDBusConnection * bus;
  DbusBattery * dbus_battery; /* com.canonical.indicator.power.Battery skeleton */
}
IndicatorPowerNotifierPrivate;

typedef IndicatorPowerNotifierPrivate priv_t;

G_DEFINE_TYPE_WITH_PRIVATE(IndicatorPowerNotifier,
                           indicator_power_notifier,
                           G_TYPE_OBJECT)

#define get_priv(o) ((priv_t*)indicator_power_notifier_get_instance_private(o))

/***
****
***/

static const char *
power_level_to_dbus_string (const PowerLevel power_level)
{
  switch (power_level)
    {
      case POWER_LEVEL_LOW:      return POWER_LEVEL_STR_LOW;
      case POWER_LEVEL_VERY_LOW: return POWER_LEVEL_STR_VERY_LOW;
      case POWER_LEVEL_CRITICAL: return POWER_LEVEL_STR_CRITICAL;
      default:                   return POWER_LEVEL_STR_OK;
    }
}

static PowerLevel
get_battery_power_level (IndicatorPowerDevice * battery)
{
  static const double percent_critical = 2.0;
  static const double percent_very_low = 5.0;
  static const double percent_low = 10.0;
  gdouble p;
  PowerLevel ret;

  g_return_val_if_fail(battery != NULL, POWER_LEVEL_OK);
  g_return_val_if_fail(indicator_power_device_get_kind(battery) == UP_DEVICE_KIND_BATTERY, POWER_LEVEL_OK);

  p = indicator_power_device_get_percentage(battery);

  if (p <= percent_critical)
    ret = POWER_LEVEL_CRITICAL;
  else if (p <= percent_very_low)
    ret = POWER_LEVEL_VERY_LOW;
  else if (p <= percent_low)
    ret = POWER_LEVEL_LOW;
  else
    ret = POWER_LEVEL_OK;

  return ret;
}

/***
****  Notifications
***/

static void
on_notify_notification_finalized (gpointer gself, GObject * dead)
{
  IndicatorPowerNotifier * const self = INDICATOR_POWER_NOTIFIER(gself);
  priv_t * const p = get_priv(self);
  g_return_if_fail ((void*)(p->notify_notification) == (void*)dead);
  p->notify_notification = NULL;
  dbus_battery_set_is_warning (p->dbus_battery, FALSE);
}

static void
notification_clear (IndicatorPowerNotifier * self)
{
  priv_t * const p = get_priv(self);
  NotifyNotification * nn;

  if ((nn = p->notify_notification))
    {
      GError * error = NULL;

      g_object_weak_unref(G_OBJECT(nn), on_notify_notification_finalized, self);

      if (!notify_notification_close(nn, &error))
        {
          g_warning("Unable to close notification: %s", error->message);
          g_error_free(error);
        }

      p->notify_notification = NULL;
      dbus_battery_set_is_warning (p->dbus_battery, FALSE);
    }
}

static void
notification_show(IndicatorPowerNotifier * self)
{
  priv_t * const p = get_priv(self);
  gdouble pct;
  char * body;
  NotifyNotification * nn;
  GError * error;

  notification_clear(self);

  /* create the notification */
  pct = indicator_power_device_get_percentage(p->battery);
  body = g_strdup_printf(_("%.0f%% charge remaining"), pct);
  nn = notify_notification_new(_("Battery Low"), body, NULL);
  g_free (body);

  /* if we can show it, keep it */
  error = NULL;
  if (notify_notification_show(nn, &error))
    {
      p->notify_notification = nn;
      g_signal_connect(nn, "closed", G_CALLBACK(g_object_unref), NULL);
      g_object_weak_ref(G_OBJECT(nn), on_notify_notification_finalized, self);
      dbus_battery_set_is_warning (p->dbus_battery, TRUE);
    }
  else
    {
      g_critical("Unable to show snap decision for '%s': %s", body, error->message);
      g_error_free(error);
      g_object_unref(nn);
    }
}

/***
****
***/

static void
on_battery_property_changed (IndicatorPowerNotifier * self)
{
  priv_t * p;
  PowerLevel old_power_level;
  PowerLevel new_power_level;
  gboolean old_discharging;
  gboolean new_discharging;

  g_return_if_fail(INDICATOR_IS_POWER_NOTIFIER(self));
  p = get_priv (self);
  g_return_if_fail(INDICATOR_IS_POWER_DEVICE(p->battery));

  old_power_level = p->power_level;
  new_power_level = get_battery_power_level (p->battery);

  old_discharging = p->discharging;
  new_discharging = indicator_power_device_get_state(p->battery) == UP_DEVICE_STATE_DISCHARGING;

  /* pop up a 'low battery' notification if either:
     a) it's already discharging, and its PowerLevel worsens, OR
     b) it's already got a bad PowerLevel and its state becomes 'discharging */
  if ((new_discharging && (old_power_level > new_power_level)) ||
      ((new_power_level != POWER_LEVEL_OK) && new_discharging && !old_discharging))
    {
      notification_show (self);
    }
  else if (!new_discharging || (new_power_level == POWER_LEVEL_OK))
    {
      notification_clear (self);
    }

  dbus_battery_set_power_level (p->dbus_battery, power_level_to_dbus_string (new_power_level));
  p->power_level = new_power_level;
  p->discharging = new_discharging;
}

/***
****  GObject virtual functions
***/

static void
my_get_property (GObject     * o,
                 guint         property_id,
                 GValue      * value,
                 GParamSpec  * pspec)
{
  IndicatorPowerNotifier * const self = INDICATOR_POWER_NOTIFIER (o);
  priv_t * const p = get_priv (self);

  switch (property_id)
    {
      case PROP_BATTERY:
        g_value_set_object (value, p->battery);
        break;

      default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (o, property_id, pspec);
    }
}

static void
my_set_property (GObject       * o,
                 guint           property_id,
                 const GValue  * value,
                 GParamSpec    * pspec)
{
  IndicatorPowerNotifier * const self = INDICATOR_POWER_NOTIFIER (o);

  switch (property_id)
    {
      case PROP_BATTERY:
        indicator_power_notifier_set_battery (self, g_value_get_object(value));
        break;

      default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (o, property_id, pspec);
    }
}

static void
my_dispose (GObject * o)
{
  IndicatorPowerNotifier * const self = INDICATOR_POWER_NOTIFIER(o);
  priv_t * const p = get_priv (self);

  indicator_power_notifier_set_bus (self, NULL);
  notification_clear (self);
  indicator_power_notifier_set_battery (self, NULL);
  g_clear_object (&p->dbus_battery);

  G_OBJECT_CLASS (indicator_power_notifier_parent_class)->dispose (o);
}

static void
my_finalize (GObject * o G_GNUC_UNUSED)
{
  /* FIXME: This is an awkward place to put this. 
     Ordinarily something like this would go in main(), but we need libnotify
     to clean itself up before shutting down the bus in the unit tests as well. */
  if (!--instance_count)
    notify_uninit();
}

/***
****  Instantiation
***/

static void
indicator_power_notifier_init (IndicatorPowerNotifier * self)
{
  priv_t * const p = get_priv (self);

  /* bind the read-only properties so they'll get pushed to the bus */

  p->dbus_battery = dbus_battery_skeleton_new ();

  p->power_level = POWER_LEVEL_OK;

  if (!instance_count++)
    {
      if (!notify_init("indicator-power-service"))
        {
          g_critical("Unable to initialize libnotify! Notifications might not be shown.");
        }
    }
}

static void
indicator_power_notifier_class_init (IndicatorPowerNotifierClass * klass)
{
  GObjectClass * object_class = G_OBJECT_CLASS (klass);

  object_class->dispose = my_dispose;
  object_class->finalize = my_finalize;
  object_class->get_property = my_get_property;
  object_class->set_property = my_set_property;

  properties[PROP_BATTERY] = g_param_spec_object (
    PROP_BATTERY_NAME,
    "Battery",
    "The current battery",
    G_TYPE_OBJECT,
    G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);

  g_object_class_install_properties (object_class, LAST_PROP, properties);
}

/***
****  Public API
***/

IndicatorPowerNotifier *
indicator_power_notifier_new (void)
{
  GObject * o = g_object_new (INDICATOR_TYPE_POWER_NOTIFIER, NULL);

  return INDICATOR_POWER_NOTIFIER (o);
}

void
indicator_power_notifier_set_battery (IndicatorPowerNotifier * self,
                                      IndicatorPowerDevice   * battery)
{
  priv_t * p;

  g_return_if_fail(INDICATOR_IS_POWER_NOTIFIER(self));
  g_return_if_fail((battery == NULL) || INDICATOR_IS_POWER_DEVICE(battery));
  g_return_if_fail((battery == NULL) || (indicator_power_device_get_kind(battery) == UP_DEVICE_KIND_BATTERY));

  p = get_priv (self);

  if (p->battery == battery)
    return;

  if (p->battery != NULL)
    {
      g_signal_handlers_disconnect_by_data (p->battery, self);
      g_clear_object (&p->battery);
      dbus_battery_set_power_level (p->dbus_battery, power_level_to_dbus_string (POWER_LEVEL_OK));
      notification_clear (self);
    }

  if (battery != NULL)
    {
      p->battery = g_object_ref (battery);
      g_signal_connect_swapped (p->battery, "notify::"INDICATOR_POWER_DEVICE_PERCENTAGE,
                                G_CALLBACK(on_battery_property_changed), self);
      g_signal_connect_swapped (p->battery, "notify::"INDICATOR_POWER_DEVICE_STATE,
                                G_CALLBACK(on_battery_property_changed), self);
      on_battery_property_changed (self);
    }
}

void
indicator_power_notifier_set_bus (IndicatorPowerNotifier * self,
                                  GDBusConnection        * bus)
{
  priv_t * p;
  GDBusInterfaceSkeleton * skel;

  g_return_if_fail(INDICATOR_IS_POWER_NOTIFIER(self));
  g_return_if_fail((bus == NULL) || G_IS_DBUS_CONNECTION(bus));

  p = get_priv (self);

  if (p->bus == bus)
    return;

  skel = G_DBUS_INTERFACE_SKELETON(p->dbus_battery);

  if (p->bus != NULL)
    {
      if (skel != NULL)
        g_dbus_interface_skeleton_unexport (skel);

      g_clear_object (&p->bus);
    }

  if (bus != NULL)
    {
      GError * error;

      p->bus = g_object_ref (bus);

      error = NULL;
      if (!g_dbus_interface_skeleton_export(skel,
                                            bus,
                                            BUS_PATH"/Battery",
                                            &error))
        {
          g_warning ("Unable to export LowBattery properties: %s", error->message);
          g_error_free (error);
        }
    }
}

const char *
indicator_power_notifier_get_power_level (IndicatorPowerDevice * battery)
{
  return power_level_to_dbus_string (get_battery_power_level (battery));
}