sway

watcher.c (7511B) - View raw

  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


#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "list.h"
#include "log.h"
#include "stringop.h"
#include "swaybar/tray/watcher.h"

static const char *obj_path = "/StatusNotifierWatcher";

static bool using_standard_protocol(struct swaybar_watcher *watcher) {
	return watcher->interface[strlen("org.")] == 'f'; // freedesktop
}

static int cmp_id(const void *item, const void *cmp_to) {
	return strcmp(item, cmp_to);
}

static int handle_lost_service(sd_bus_message *msg,
		void *data, sd_bus_error *error) {
	char *service, *old_owner, *new_owner;
	int ret = sd_bus_message_read(msg, "sss", &service, &old_owner, &new_owner);
	if (ret < 0) {
		sway_log(SWAY_ERROR, "Failed to parse owner change message: %s", strerror(-ret));
		return ret;
	}

	if (!*new_owner) {
		struct swaybar_watcher *watcher = data;
		for (int idx = 0; idx < watcher->items->length; ++idx) {
			char *id = watcher->items->items[idx];
			bool cmp_res = using_standard_protocol(watcher) ?
				cmp_id(id, service) == 0 : has_prefix(id, service);
			if (cmp_res) {
				sway_log(SWAY_DEBUG, "Unregistering Status Notifier Item '%s'", id);
				list_del(watcher->items, idx--);
				sd_bus_emit_signal(watcher->bus, obj_path, watcher->interface,
						"StatusNotifierItemUnregistered", "s", id);
				sd_bus_emit_properties_changed(watcher->bus, obj_path, watcher->interface,
						"RegisteredStatusNotifierItems", NULL);
				free(id);
				if (using_standard_protocol(watcher)) {
					break;
				}
			}
		}

		int idx = list_seq_find(watcher->hosts, cmp_id, service);
		if (idx != -1) {
			sway_log(SWAY_DEBUG, "Unregistering Status Notifier Host '%s'", service);
			free(watcher->hosts->items[idx]);
			list_del(watcher->hosts, idx);
			if (watcher->hosts->length == 0) {
				sd_bus_emit_properties_changed(watcher->bus, obj_path, watcher->interface,
						"IsStatusNotifierHostRegistered", NULL);
			}
		}
	}

	return 0;
}

static int register_sni(sd_bus_message *msg, void *data, sd_bus_error *error) {
	char *service_or_path, *id;
	int ret = sd_bus_message_read(msg, "s", &service_or_path);
	if (ret < 0) {
		sway_log(SWAY_ERROR, "Failed to parse register SNI message: %s", strerror(-ret));
		return ret;
	}

	struct swaybar_watcher *watcher = data;
	if (using_standard_protocol(watcher)) {
		id = strdup(service_or_path);
	} else {
		const char *service, *path;
		if (service_or_path[0] == '/') {
			service = sd_bus_message_get_sender(msg);
			path = service_or_path;
		} else {
			service = service_or_path;
			path = "/StatusNotifierItem";
		}
		id = format_str("%s%s", service, path);
	}

	if (list_seq_find(watcher->items, cmp_id, id) == -1) {
		sway_log(SWAY_DEBUG, "Registering Status Notifier Item '%s'", id);
		list_add(watcher->items, id);
		sd_bus_emit_properties_changed(watcher->bus, obj_path, watcher->interface,
				"RegisteredStatusNotifierItems", NULL);
		sd_bus_emit_signal(watcher->bus, obj_path, watcher->interface,
				"StatusNotifierItemRegistered", "s", id);
	} else {
		sway_log(SWAY_DEBUG, "Status Notifier Item '%s' already registered", id);
		free(id);
	}

	return sd_bus_reply_method_return(msg, "");
}

static int register_host(sd_bus_message *msg, void *data, sd_bus_error *error) {
	char *service;
	int ret = sd_bus_message_read(msg, "s", &service);
	if (ret < 0) {
		sway_log(SWAY_ERROR, "Failed to parse register host message: %s", strerror(-ret));
		return ret;
	}

	struct swaybar_watcher *watcher = data;
	if (list_seq_find(watcher->hosts, cmp_id, service) == -1) {
		sway_log(SWAY_DEBUG, "Registering Status Notifier Host '%s'", service);
		list_add(watcher->hosts, strdup(service));
		if (watcher->hosts->length == 1) {
			sd_bus_emit_properties_changed(watcher->bus, obj_path, watcher->interface,
					"IsStatusNotifierHostRegistered", NULL);
		}
		sd_bus_emit_signal(watcher->bus, obj_path, watcher->interface,
				"StatusNotifierHostRegistered", "");
	} else {
		sway_log(SWAY_DEBUG, "Status Notifier Host '%s' already registered", service);
	}

	return sd_bus_reply_method_return(msg, "");
}

static int get_registered_snis(sd_bus *bus, const char *obj_path,
		const char *interface, const char *property, sd_bus_message *reply,
		void *data, sd_bus_error *error) {
	struct swaybar_watcher *watcher = data;
	list_add(watcher->items, NULL); // strv expects NULL-terminated string array
	int ret = sd_bus_message_append_strv(reply, (char **)watcher->items->items);
	list_del(watcher->items, watcher->items->length - 1);
	return ret;
}

static int is_host_registered(sd_bus *bus, const char *obj_path,
		const char *interface, const char *property, sd_bus_message *reply,
		void *data, sd_bus_error *error) {
	struct swaybar_watcher *watcher = data;
	int val = watcher->hosts->length > 0; // dbus expects int rather than bool
	return sd_bus_message_append_basic(reply, 'b', &val);
}

static const sd_bus_vtable watcher_vtable[] = {
	SD_BUS_VTABLE_START(0),
	SD_BUS_METHOD("RegisterStatusNotifierItem", "s", "", register_sni,
			SD_BUS_VTABLE_UNPRIVILEGED),
	SD_BUS_METHOD("RegisterStatusNotifierHost", "s", "", register_host,
			SD_BUS_VTABLE_UNPRIVILEGED),
	SD_BUS_PROPERTY("RegisteredStatusNotifierItems", "as", get_registered_snis,
			0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
	SD_BUS_PROPERTY("IsStatusNotifierHostRegistered", "b", is_host_registered,
			0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
	SD_BUS_PROPERTY("ProtocolVersion", "i", NULL,
			offsetof(struct swaybar_watcher, version),
			SD_BUS_VTABLE_PROPERTY_CONST),
	SD_BUS_SIGNAL("StatusNotifierItemRegistered", "s", 0),
	SD_BUS_SIGNAL("StatusNotifierItemUnregistered", "s", 0),
	SD_BUS_SIGNAL("StatusNotifierHostRegistered", NULL, 0),
	SD_BUS_VTABLE_END
};

struct swaybar_watcher *create_watcher(char *protocol, sd_bus *bus) {
	struct swaybar_watcher *watcher =
		calloc(1, sizeof(struct swaybar_watcher));
	if (!watcher) {
		return NULL;
	}

	watcher->interface = format_str("org.%s.StatusNotifierWatcher", protocol);

	sd_bus_slot *signal_slot = NULL, *vtable_slot = NULL;
	int ret = sd_bus_add_object_vtable(bus, &vtable_slot, obj_path,
			watcher->interface, watcher_vtable, watcher);
	if (ret < 0) {
		sway_log(SWAY_ERROR, "Failed to add object vtable: %s", strerror(-ret));
		goto error;
	}

	ret = sd_bus_match_signal(bus, &signal_slot, "org.freedesktop.DBus",
			"/org/freedesktop/DBus", "org.freedesktop.DBus",
			"NameOwnerChanged", handle_lost_service, watcher);
	if (ret < 0) {
		sway_log(SWAY_ERROR, "Failed to subscribe to unregistering events: %s",
				strerror(-ret));
		goto error;
	}

	ret = sd_bus_request_name(bus, watcher->interface, 0);
	if (ret < 0) {
		if (-ret == EEXIST) {
			sway_log(SWAY_DEBUG, "Failed to acquire service name '%s':"
					"another tray is already running", watcher->interface);
		} else {
			sway_log(SWAY_ERROR, "Failed to acquire service name '%s': %s",
					watcher->interface, strerror(-ret));
		}
		goto error;
	}

	sd_bus_slot_set_floating(signal_slot, 0);
	sd_bus_slot_set_floating(vtable_slot, 0);

	watcher->bus = bus;
	watcher->hosts = create_list();
	watcher->items = create_list();
	watcher->version = 0;
	sway_log(SWAY_DEBUG, "Registered %s", watcher->interface);
	return watcher;
error:
	sd_bus_slot_unref(signal_slot);
	sd_bus_slot_unref(vtable_slot);
	destroy_watcher(watcher);
	return NULL;
}

void destroy_watcher(struct swaybar_watcher *watcher) {
	if (!watcher) {
		return;
	}
	list_free_items_and_destroy(watcher->hosts);
	list_free_items_and_destroy(watcher->items);
	free(watcher->interface);
	free(watcher);
}