sessiond: notification: add support for async commands
[lttng-tools.git] / src / bin / lttng-sessiond / notification-thread-commands.c
1 /*
2 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #include <lttng/trigger/trigger.h>
9 #include <lttng/lttng-error.h>
10 #include "notification-thread.h"
11 #include "notification-thread-commands.h"
12 #include <common/error.h>
13 #include <unistd.h>
14 #include <stdint.h>
15 #include <inttypes.h>
16
17 static
18 void init_notification_thread_command(struct notification_thread_command *cmd)
19 {
20 CDS_INIT_LIST_HEAD(&cmd->cmd_list_node);
21 lttng_waiter_init(&cmd->reply_waiter);
22 }
23
24 static
25 int run_command_wait(struct notification_thread_handle *handle,
26 struct notification_thread_command *cmd)
27 {
28 int ret;
29 uint64_t notification_counter = 1;
30
31 pthread_mutex_lock(&handle->cmd_queue.lock);
32 /* Add to queue. */
33 cds_list_add_tail(&cmd->cmd_list_node,
34 &handle->cmd_queue.list);
35 /* Wake-up thread. */
36 ret = lttng_write(lttng_pipe_get_writefd(handle->cmd_queue.event_pipe),
37 &notification_counter, sizeof(notification_counter));
38 if (ret != sizeof(notification_counter)) {
39 PERROR("write to notification thread's queue event fd");
40 /*
41 * Remove the command from the list so the notification
42 * thread does not process it.
43 */
44 cds_list_del(&cmd->cmd_list_node);
45 goto error_unlock_queue;
46 }
47 pthread_mutex_unlock(&handle->cmd_queue.lock);
48
49 lttng_waiter_wait(&cmd->reply_waiter);
50 return 0;
51 error_unlock_queue:
52 pthread_mutex_unlock(&handle->cmd_queue.lock);
53 return -1;
54 }
55
56 static
57 struct notification_thread_command *notification_thread_command_copy(
58 const struct notification_thread_command *original_cmd)
59 {
60 struct notification_thread_command *new_cmd;
61
62 new_cmd = zmalloc(sizeof(*new_cmd));
63 if (!new_cmd) {
64 goto end;
65 }
66
67 *new_cmd = *original_cmd;
68 init_notification_thread_command(new_cmd);
69 end:
70 return new_cmd;
71 }
72
73 static
74 int run_command_no_wait(struct notification_thread_handle *handle,
75 const struct notification_thread_command *in_cmd)
76 {
77 int ret;
78 uint64_t notification_counter = 1;
79 struct notification_thread_command *new_cmd =
80 notification_thread_command_copy(in_cmd);
81
82 if (!new_cmd) {
83 goto error;
84 }
85 new_cmd->is_async = true;
86
87 pthread_mutex_lock(&handle->cmd_queue.lock);
88 /* Add to queue. */
89 cds_list_add_tail(&new_cmd->cmd_list_node,
90 &handle->cmd_queue.list);
91 /* Wake-up thread. */
92 ret = lttng_write(lttng_pipe_get_writefd(handle->cmd_queue.event_pipe),
93 &notification_counter, sizeof(notification_counter));
94 if (ret != sizeof(notification_counter)) {
95 PERROR("write to notification thread's queue event fd");
96 /*
97 * Remove the command from the list so the notification
98 * thread does not process it.
99 */
100 cds_list_del(&new_cmd->cmd_list_node);
101 goto error_unlock_queue;
102 }
103 pthread_mutex_unlock(&handle->cmd_queue.lock);
104 return 0;
105 error_unlock_queue:
106 free(new_cmd);
107 pthread_mutex_unlock(&handle->cmd_queue.lock);
108 error:
109 return -1;
110 }
111
112 enum lttng_error_code notification_thread_command_register_trigger(
113 struct notification_thread_handle *handle,
114 struct lttng_trigger *trigger)
115 {
116 int ret;
117 enum lttng_error_code ret_code;
118 struct notification_thread_command cmd = {};
119
120 init_notification_thread_command(&cmd);
121
122 cmd.type = NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER;
123 cmd.parameters.trigger = trigger;
124
125 ret = run_command_wait(handle, &cmd);
126 if (ret) {
127 ret_code = LTTNG_ERR_UNK;
128 goto end;
129 }
130 ret_code = cmd.reply_code;
131 end:
132 return ret_code;
133 }
134
135 enum lttng_error_code notification_thread_command_unregister_trigger(
136 struct notification_thread_handle *handle,
137 struct lttng_trigger *trigger)
138 {
139 int ret;
140 enum lttng_error_code ret_code;
141 struct notification_thread_command cmd = {};
142
143 init_notification_thread_command(&cmd);
144
145 cmd.type = NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER;
146 cmd.parameters.trigger = trigger;
147
148 ret = run_command_wait(handle, &cmd);
149 if (ret) {
150 ret_code = LTTNG_ERR_UNK;
151 goto end;
152 }
153 ret_code = cmd.reply_code;
154 end:
155 return ret_code;
156 }
157
158 enum lttng_error_code notification_thread_command_add_channel(
159 struct notification_thread_handle *handle,
160 char *session_name, uid_t uid, gid_t gid,
161 char *channel_name, uint64_t key,
162 enum lttng_domain_type domain, uint64_t capacity)
163 {
164 int ret;
165 enum lttng_error_code ret_code;
166 struct notification_thread_command cmd = {};
167
168 init_notification_thread_command(&cmd);
169
170 cmd.type = NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL;
171 cmd.parameters.add_channel.session.name = session_name;
172 cmd.parameters.add_channel.session.uid = uid;
173 cmd.parameters.add_channel.session.gid = gid;
174 cmd.parameters.add_channel.channel.name = channel_name;
175 cmd.parameters.add_channel.channel.key = key;
176 cmd.parameters.add_channel.channel.domain = domain;
177 cmd.parameters.add_channel.channel.capacity = capacity;
178
179 ret = run_command_wait(handle, &cmd);
180 if (ret) {
181 ret_code = LTTNG_ERR_UNK;
182 goto end;
183 }
184 ret_code = cmd.reply_code;
185 end:
186 return ret_code;
187 }
188
189 enum lttng_error_code notification_thread_command_remove_channel(
190 struct notification_thread_handle *handle,
191 uint64_t key, enum lttng_domain_type domain)
192 {
193 int ret;
194 enum lttng_error_code ret_code;
195 struct notification_thread_command cmd = {};
196
197 init_notification_thread_command(&cmd);
198
199 cmd.type = NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL;
200 cmd.parameters.remove_channel.key = key;
201 cmd.parameters.remove_channel.domain = domain;
202
203 ret = run_command_wait(handle, &cmd);
204 if (ret) {
205 ret_code = LTTNG_ERR_UNK;
206 goto end;
207 }
208 ret_code = cmd.reply_code;
209 end:
210 return ret_code;
211 }
212
213 enum lttng_error_code notification_thread_command_session_rotation_ongoing(
214 struct notification_thread_handle *handle,
215 const char *session_name, uid_t uid, gid_t gid,
216 uint64_t trace_archive_chunk_id)
217 {
218 int ret;
219 enum lttng_error_code ret_code;
220 struct notification_thread_command cmd = {};
221
222 init_notification_thread_command(&cmd);
223
224 cmd.type = NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING;
225 cmd.parameters.session_rotation.session_name = session_name;
226 cmd.parameters.session_rotation.uid = uid;
227 cmd.parameters.session_rotation.gid = gid;
228 cmd.parameters.session_rotation.trace_archive_chunk_id =
229 trace_archive_chunk_id;
230
231 ret = run_command_wait(handle, &cmd);
232 if (ret) {
233 ret_code = LTTNG_ERR_UNK;
234 goto end;
235 }
236 ret_code = cmd.reply_code;
237 end:
238 return ret_code;
239 }
240
241 enum lttng_error_code notification_thread_command_session_rotation_completed(
242 struct notification_thread_handle *handle,
243 const char *session_name, uid_t uid, gid_t gid,
244 uint64_t trace_archive_chunk_id,
245 struct lttng_trace_archive_location *location)
246 {
247 int ret;
248 enum lttng_error_code ret_code;
249 struct notification_thread_command cmd = {};
250
251 init_notification_thread_command(&cmd);
252
253 cmd.type = NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED;
254 cmd.parameters.session_rotation.session_name = session_name;
255 cmd.parameters.session_rotation.uid = uid;
256 cmd.parameters.session_rotation.gid = gid;
257 cmd.parameters.session_rotation.trace_archive_chunk_id =
258 trace_archive_chunk_id;
259 cmd.parameters.session_rotation.location = location;
260
261 ret = run_command_wait(handle, &cmd);
262 if (ret) {
263 ret_code = LTTNG_ERR_UNK;
264 goto end;
265 }
266 ret_code = cmd.reply_code;
267 end:
268 return ret_code;
269 }
270
271 void notification_thread_command_quit(
272 struct notification_thread_handle *handle)
273 {
274 int ret;
275 struct notification_thread_command cmd = {};
276
277 init_notification_thread_command(&cmd);
278
279 cmd.type = NOTIFICATION_COMMAND_TYPE_QUIT;
280 ret = run_command_wait(handle, &cmd);
281 assert(!ret && cmd.reply_code == LTTNG_OK);
282 }
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