chiark / gitweb /
dbus: to make sure that systemd stays controllable during early bootup, register...
[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, DBusConnection *connection, 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
92         if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Job", "Cancel")) {
93                 if (!(reply = dbus_message_new_method_return(message)))
94                         goto oom;
95
96                 job_free(j);
97
98         } else
99                 return bus_default_message_handler(j->manager, connection, message, INTROSPECTION, properties);
100
101         if (reply) {
102                 if (!dbus_connection_send(connection, reply, NULL))
103                         goto oom;
104
105                 dbus_message_unref(reply);
106         }
107
108         return DBUS_HANDLER_RESULT_HANDLED;
109
110 oom:
111         if (reply)
112                 dbus_message_unref(reply);
113
114         return DBUS_HANDLER_RESULT_NEED_MEMORY;
115 }
116
117 static DBusHandlerResult bus_job_message_handler(DBusConnection *connection, DBusMessage  *message, void *data) {
118         Manager *m = data;
119         Job *j;
120         int r;
121
122         assert(connection);
123         assert(message);
124         assert(m);
125
126         log_debug("Got D-Bus request: %s.%s() on %s",
127                   dbus_message_get_interface(message),
128                   dbus_message_get_member(message),
129                   dbus_message_get_path(message));
130
131         if ((r = manager_get_job_from_dbus_path(m, dbus_message_get_path(message), &j)) < 0) {
132
133                 if (r == -ENOMEM)
134                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
135
136                 if (r == -ENOENT)
137                         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
138
139                 return bus_send_error_reply(m, connection, message, NULL, r);
140         }
141
142         return bus_job_message_dispatch(j, connection, message);
143 }
144
145 const DBusObjectPathVTable bus_job_vtable = {
146         .message_function = bus_job_message_handler
147 };
148
149 void bus_job_send_change_signal(Job *j) {
150         char *p = NULL;
151         DBusMessage *m = NULL;
152
153         assert(j);
154         assert(j->in_dbus_queue);
155
156         LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j);
157         j->in_dbus_queue = false;
158
159         if (set_isempty(j->manager->subscribed)) {
160                 j->sent_dbus_new_signal = true;
161                 return;
162         }
163
164         if (!(p = job_dbus_path(j)))
165                 goto oom;
166
167         if (j->sent_dbus_new_signal) {
168                 /* Send a change signal */
169
170                 if (!(m = dbus_message_new_signal(p, "org.freedesktop.systemd1.Job", "Changed")))
171                         goto oom;
172         } else {
173                 /* Send a new signal */
174
175                 if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobNew")))
176                         goto oom;
177
178                 if (!dbus_message_append_args(m,
179                                               DBUS_TYPE_UINT32, &j->id,
180                                               DBUS_TYPE_OBJECT_PATH, &p,
181                                               DBUS_TYPE_INVALID))
182                         goto oom;
183         }
184
185         if (bus_broadcast(j->manager, m) < 0)
186                 goto oom;
187
188         free(p);
189         dbus_message_unref(m);
190
191         j->sent_dbus_new_signal = true;
192
193         return;
194
195 oom:
196         free(p);
197
198         if (m)
199                 dbus_message_unref(m);
200
201         log_error("Failed to allocate job change signal.");
202 }
203
204 void bus_job_send_removed_signal(Job *j, bool success) {
205         char *p = NULL;
206         DBusMessage *m = NULL;
207         dbus_bool_t b = success;
208
209         assert(j);
210
211         if (set_isempty(j->manager->subscribed))
212                 return;
213
214         if (!j->sent_dbus_new_signal)
215                 bus_job_send_change_signal(j);
216
217         if (!(p = job_dbus_path(j)))
218                 goto oom;
219
220         if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobRemoved")))
221                 goto oom;
222
223         if (!dbus_message_append_args(m,
224                                       DBUS_TYPE_UINT32, &j->id,
225                                       DBUS_TYPE_OBJECT_PATH, &p,
226                                       DBUS_TYPE_BOOLEAN, &b,
227                                       DBUS_TYPE_INVALID))
228                 goto oom;
229
230         if (bus_broadcast(j->manager, m) < 0)
231                 goto oom;
232
233         free(p);
234         dbus_message_unref(m);
235
236         return;
237
238 oom:
239         free(p);
240
241         if (m)
242                 dbus_message_unref(m);
243
244         log_error("Failed to allocate job remove signal.");
245 }