1 /* GIO - GLib Input, Output and Streaming Library
2 *
3 * Copyright 2019 Red Hat, Inc.
4 *
5 * SPDX-License-Identifier: LGPL-2.1-or-later
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General
18 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "config.h"
22
23 #include "gmemorymonitor.h"
24 #include "gmemorymonitorportal.h"
25 #include "ginitable.h"
26 #include "giomodule-priv.h"
27 #include "xdp-dbus.h"
28 #include "gportalsupport.h"
29
30 #define G_MEMORY_MONITOR_PORTAL_GET_INITABLE_IFACE(o) (G_TYPE_INSTANCE_GET_INTERFACE ((o), G_TYPE_INITABLE, GInitable))
31
32 static void g_memory_monitor_portal_iface_init (GMemoryMonitorInterface *iface);
33 static void g_memory_monitor_portal_initable_iface_init (GInitableIface *iface);
34
35 struct _GMemoryMonitorPortal
36 {
37 GObject parent_instance;
38
39 GDBusProxy *proxy;
40 gulong signal_id;
41 };
42
43 G_DEFINE_TYPE_WITH_CODE (GMemoryMonitorPortal, g_memory_monitor_portal, G_TYPE_OBJECT,
44 G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
45 g_memory_monitor_portal_initable_iface_init)
46 G_IMPLEMENT_INTERFACE (G_TYPE_MEMORY_MONITOR,
47 g_memory_monitor_portal_iface_init)
48 _g_io_modules_ensure_extension_points_registered ();
49 g_io_extension_point_implement (G_MEMORY_MONITOR_EXTENSION_POINT_NAME,
50 g_define_type_id,
51 "portal",
52 40))
53
54 static void
55 g_memory_monitor_portal_init (GMemoryMonitorPortal *portal)
56 {
57 }
58
59 static void
60 proxy_signal (GDBusProxy *proxy,
61 const char *sender,
62 const char *signal,
63 GVariant *parameters,
64 GMemoryMonitorPortal *portal)
65 {
66 guint8 level;
67
68 if (strcmp (signal, "LowMemoryWarning") != 0)
69 return;
70 if (!parameters)
71 return;
72
73 g_variant_get (parameters, "(y)", &level);
74 g_signal_emit_by_name (portal, "low-memory-warning", level);
75 }
76
77 static gboolean
78 g_memory_monitor_portal_initable_init (GInitable *initable,
79 GCancellable *cancellable,
80 GError **error)
81 {
82 GMemoryMonitorPortal *portal = G_MEMORY_MONITOR_PORTAL (initable);
83 GDBusProxy *proxy;
84 gchar *name_owner = NULL;
85
86 if (!glib_should_use_portal ())
87 {
88 g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, "Not using portals");
89 return FALSE;
90 }
91
92 proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SESSION,
93 G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES,
94 NULL,
95 "org.freedesktop.portal.Desktop",
96 "/org/freedesktop/portal/desktop",
97 "org.freedesktop.portal.MemoryMonitor",
98 cancellable,
99 error);
100 if (!proxy)
101 return FALSE;
102
103 name_owner = g_dbus_proxy_get_name_owner (proxy);
104
105 if (name_owner == NULL)
106 {
107 g_object_unref (proxy);
108 g_set_error (error,
109 G_DBUS_ERROR,
110 G_DBUS_ERROR_NAME_HAS_NO_OWNER,
111 "Desktop portal not found");
112 return FALSE;
113 }
114
115 g_free (name_owner);
116
117 portal->signal_id = g_signal_connect (proxy, "g-signal",
118 G_CALLBACK (proxy_signal), portal);
119
120 portal->proxy = proxy;
121
122 return TRUE;
123 }
124
125 static void
126 g_memory_monitor_portal_finalize (GObject *object)
127 {
128 GMemoryMonitorPortal *portal = G_MEMORY_MONITOR_PORTAL (object);
129
130 if (portal->proxy != NULL)
131 g_clear_signal_handler (&portal->signal_id, portal->proxy);
132 g_clear_object (&portal->proxy);
133
134 G_OBJECT_CLASS (g_memory_monitor_portal_parent_class)->finalize (object);
135 }
136
137 static void
138 g_memory_monitor_portal_class_init (GMemoryMonitorPortalClass *nl_class)
139 {
140 GObjectClass *gobject_class = G_OBJECT_CLASS (nl_class);
141
142 gobject_class->finalize = g_memory_monitor_portal_finalize;
143 }
144
145 static void
146 g_memory_monitor_portal_iface_init (GMemoryMonitorInterface *monitor_iface)
147 {
148 }
149
150 static void
151 g_memory_monitor_portal_initable_iface_init (GInitableIface *iface)
152 {
153 iface->init = g_memory_monitor_portal_initable_init;
154 }