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