chiark / gitweb /
dbus: be a bit more verbose for bus activation
[elogind.git] / src / dbus-job.c
1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
2
3 /***
4   This file is part of systemd.
5
6   Copyright 2010 Lennart Poettering
7
8   systemd is free software; you can redistribute it and/or modify it
9   under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 2 of the License, or
11   (at your option) any later version.
12
13   systemd is distributed in the hope that it will be useful, but
14   WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16   General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <errno.h>
23
24 #include "dbus.h"
25 #include "log.h"
26 #include "dbus-job.h"
27
28 #define BUS_JOB_INTERFACE                                             \
29         " <interface name=\"org.freedesktop.systemd1.Job\">\n"        \
30         "  <method name=\"Cancel\"/>\n"                               \
31         "  <signal name=\"Changed\"/>\n"                              \
32         "  <property name=\"Id\" type=\"u\" access=\"read\"/>\n"      \
33         "  <property name=\"Unit\" type=\"(so)\" access=\"read\"/>\n" \
34         "  <property name=\"JobType\" type=\"s\" access=\"read\"/>\n" \
35         "  <property name=\"State\" type=\"s\" access=\"read\"/>\n"   \
36         " </interface>\n"
37
38 #define INTROSPECTION                                                 \
39         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                     \
40         "<node>\n"                                                    \
41         BUS_JOB_INTERFACE                                             \
42         BUS_PROPERTIES_INTERFACE                                      \
43         BUS_INTROSPECTABLE_INTERFACE                                  \
44         "</node>\n"
45
46 const char bus_job_interface[] = BUS_JOB_INTERFACE;
47
48 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_job_append_state, job_state, JobState);
49 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_job_append_type, job_type, JobType);
50
51 static int bus_job_append_unit(Manager *m, DBusMessageIter *i, const char *property, void *data) {
52         Job *j = data;
53         DBusMessageIter sub;
54         char *p;
55
56         assert(m);
57         assert(i);
58         assert(property);
59         assert(j);
60
61         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
62                 return -ENOMEM;
63
64         if (!(p = unit_dbus_path(j->unit)))
65                 return -ENOMEM;
66
67         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &j->unit->meta.id) ||
68             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
69                 free(p);
70                 return -ENOMEM;
71         }
72
73         free(p);
74
75         if (!dbus_message_iter_close_container(i, &sub))
76                 return -ENOMEM;
77
78         return 0;
79 }
80
81 static DBusHandlerResult bus_job_message_dispatch(Job *j, DBusMessage *message) {
82         const BusProperty properties[] = {
83                 { "org.freedesktop.systemd1.Job", "Id",      bus_property_append_uint32, "u",    &j->id    },
84                 { "org.freedesktop.systemd1.Job", "State",   bus_job_append_state,       "s",    &j->state },
85                 { "org.freedesktop.systemd1.Job", "JobType", bus_job_append_type,        "s",    &j->type  },
86                 { "org.freedesktop.systemd1.Job", "Unit",    bus_job_append_unit,        "(so)", j         },
87                 { NULL, NULL, NULL, NULL, NULL }
88         };
89
90         DBusMessage *reply = NULL;
91         Manager *m = j->manager;
92
93         if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Job", "Cancel")) {
94                 if (!(reply = dbus_message_new_method_return(message)))
95                         goto oom;
96
97                 job_free(j);
98
99         } else
100                 return bus_default_message_handler(j->manager, message, INTROSPECTION, properties);
101
102         if (reply) {
103                 if (!dbus_connection_send(m->api_bus, reply, NULL))
104                         goto oom;
105
106                 dbus_message_unref(reply);
107         }
108
109         return DBUS_HANDLER_RESULT_HANDLED;
110
111 oom:
112         if (reply)
113                 dbus_message_unref(reply);
114
115         return DBUS_HANDLER_RESULT_NEED_MEMORY;
116 }
117
118 static DBusHandlerResult bus_job_message_handler(DBusConnection  *connection, DBusMessage  *message, void *data) {
119         Manager *m = data;
120         Job *j;
121         int r;
122
123         assert(connection);
124         assert(message);
125         assert(m);
126
127         log_debug("Got D-Bus request: %s.%s() on %s",
128                   dbus_message_get_interface(message),
129                   dbus_message_get_member(message),
130                   dbus_message_get_path(message));
131
132         if ((r = manager_get_job_from_dbus_path(m, dbus_message_get_path(message), &j)) < 0) {
133
134                 if (r == -ENOMEM)
135                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
136
137                 if (r == -ENOENT)
138                         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
139
140                 return bus_send_error_reply(m, message, NULL, r);
141         }
142
143         return bus_job_message_dispatch(j, message);
144 }
145
146 const DBusObjectPathVTable bus_job_vtable = {
147         .message_function = bus_job_message_handler
148 };
149
150 void bus_job_send_change_signal(Job *j) {
151         char *p = NULL;
152         DBusMessage *m = NULL;
153
154         assert(j);
155         assert(j->in_dbus_queue);
156
157         LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j);
158         j->in_dbus_queue = false;
159
160         if (set_isempty(j->manager->subscribed)) {
161                 j->sent_dbus_new_signal = true;
162                 return;
163         }
164
165         if (!(p = job_dbus_path(j)))
166                 goto oom;
167
168         if (j->sent_dbus_new_signal) {
169                 /* Send a change signal */
170
171                 if (!(m = dbus_message_new_signal(p, "org.freedesktop.systemd1.Job", "Changed")))
172                         goto oom;
173         } else {
174                 /* Send a new signal */
175
176                 if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobNew")))
177                         goto oom;
178
179                 if (!dbus_message_append_args(m,
180                                               DBUS_TYPE_UINT32, &j->id,
181                                               DBUS_TYPE_OBJECT_PATH, &p,
182                                               DBUS_TYPE_INVALID))
183                         goto oom;
184         }
185
186         if (!dbus_connection_send(j->manager->api_bus, m, NULL))
187                 goto oom;
188
189         free(p);
190         dbus_message_unref(m);
191
192         j->sent_dbus_new_signal = true;
193
194         return;
195
196 oom:
197         free(p);
198
199         if (m)
200                 dbus_message_unref(m);
201
202         log_error("Failed to allocate job change signal.");
203 }
204
205 void bus_job_send_removed_signal(Job *j, bool success) {
206         char *p = NULL;
207         DBusMessage *m = NULL;
208         dbus_bool_t b = success;
209
210         assert(j);
211
212         if (set_isempty(j->manager->subscribed))
213                 return;
214
215         if (!j->sent_dbus_new_signal)
216                 bus_job_send_change_signal(j);
217
218         if (!(p = job_dbus_path(j)))
219                 goto oom;
220
221         if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobRemoved")))
222                 goto oom;
223
224         if (!dbus_message_append_args(m,
225                                       DBUS_TYPE_UINT32, &j->id,
226                                       DBUS_TYPE_OBJECT_PATH, &p,
227                                       DBUS_TYPE_BOOLEAN, &b,
228                                       DBUS_TYPE_INVALID))
229                 goto oom;
230
231         if (!dbus_connection_send(j->manager->api_bus, m, NULL))
232                 goto oom;
233
234         free(p);
235         dbus_message_unref(m);
236
237         return;
238
239 oom:
240         free(p);
241
242         if (m)
243                 dbus_message_unref(m);
244
245         log_error("Failed to allocate job remove signal.");
246 }