2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License, version 2 only, as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <common/common.h>
22 #include <common/utils.h>
23 #include <common/compat/uuid.h>
24 #include <urcu/rculist.h>
26 #include "ctf-trace.h"
27 #include "lttng-relayd.h"
29 #include "sessiond-trace-chunks.h"
32 /* Global session id used in the session creation. */
33 static uint64_t last_relay_session_id
;
34 static pthread_mutex_t last_relay_session_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
36 static int session_set_anonymous_chunk(struct relay_session
*session
)
39 struct lttng_trace_chunk
*chunk
= NULL
;
40 enum lttng_trace_chunk_status status
;
41 struct lttng_directory_handle output_directory
;
42 char *base_path
= opt_output_path
;
44 if (base_path
== NULL
) {
45 /* No output path defined */
46 base_path
= utils_get_home_dir();
47 if (base_path
== NULL
) {
48 ERR("Home path not found.\n \
49 Please specify an output path using -o, --output PATH");
55 ret
= lttng_directory_handle_init(&output_directory
, base_path
);
60 chunk
= lttng_trace_chunk_create_anonymous();
65 status
= lttng_trace_chunk_set_credentials_current_user(chunk
);
66 if (status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
71 status
= lttng_trace_chunk_set_as_owner(chunk
, &output_directory
);
72 if (status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
76 session
->current_trace_chunk
= chunk
;
79 lttng_trace_chunk_put(chunk
);
80 lttng_directory_handle_fini(&output_directory
);
85 * Create a new session by assigning a new session ID.
87 * Return allocated session or else NULL.
89 struct relay_session
*session_create(const char *session_name
,
93 const lttng_uuid sessiond_uuid
,
94 const uint64_t *id_sessiond
,
95 const uint64_t *current_chunk_id
,
96 const time_t *creation_time
,
101 struct relay_session
*session
;
103 session
= zmalloc(sizeof(*session
));
105 PERROR("Failed to allocate session");
108 if (lttng_strncpy(session
->session_name
, session_name
,
109 sizeof(session
->session_name
))) {
110 WARN("Session name exceeds maximal allowed length");
113 if (lttng_strncpy(session
->hostname
, hostname
,
114 sizeof(session
->hostname
))) {
115 WARN("Hostname exceeds maximal allowed length");
118 session
->ctf_traces_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
119 if (!session
->ctf_traces_ht
) {
123 pthread_mutex_lock(&last_relay_session_id_lock
);
124 session
->id
= ++last_relay_session_id
;
125 pthread_mutex_unlock(&last_relay_session_id_lock
);
127 session
->major
= major
;
128 session
->minor
= minor
;
129 lttng_ht_node_init_u64(&session
->session_n
, session
->id
);
130 urcu_ref_init(&session
->ref
);
131 CDS_INIT_LIST_HEAD(&session
->recv_list
);
132 pthread_mutex_init(&session
->lock
, NULL
);
133 pthread_mutex_init(&session
->recv_list_lock
, NULL
);
135 session
->live_timer
= live_timer
;
136 session
->snapshot
= snapshot
;
137 lttng_uuid_copy(session
->sessiond_uuid
, sessiond_uuid
);
140 LTTNG_OPTIONAL_SET(&session
->id_sessiond
, *id_sessiond
);
143 ret
= sessiond_trace_chunk_registry_session_created(
144 sessiond_trace_chunk_registry
, sessiond_uuid
);
149 if (id_sessiond
&& current_chunk_id
) {
150 session
->current_trace_chunk
=
151 sessiond_trace_chunk_registry_get_chunk(
152 sessiond_trace_chunk_registry
,
153 session
->sessiond_uuid
,
154 session
->id_sessiond
.value
,
156 if (!session
->current_trace_chunk
) {
157 char uuid_str
[UUID_STR_LEN
];
159 lttng_uuid_to_str(sessiond_uuid
, uuid_str
);
160 ERR("Could not find trace chunk: sessiond = {%s}, sessiond session id = %" PRIu64
", trace chunk id = %" PRIu64
,
161 uuid_str
, *id_sessiond
,
164 } else if (!id_sessiond
) {
166 * Pre-2.11 peers will not announce trace chunks. An
167 * anonymous trace chunk which will remain set for the
168 * duration of the session is created.
170 ret
= session_set_anonymous_chunk(session
);
176 lttng_ht_add_unique_u64(sessions_ht
, &session
->session_n
);
178 LTTNG_OPTIONAL_SET(&session
->creation_time
, *creation_time
);
183 session_put(session
);
187 /* Should be called with RCU read-side lock held. */
188 bool session_get(struct relay_session
*session
)
190 return urcu_ref_get_unless_zero(&session
->ref
);
194 * Lookup a session within the session hash table using the session id
195 * as key. A session reference is taken when a session is returned.
196 * session_put() must be called on that session.
198 * Return session or NULL if not found.
200 struct relay_session
*session_get_by_id(uint64_t id
)
202 struct relay_session
*session
= NULL
;
203 struct lttng_ht_node_u64
*node
;
204 struct lttng_ht_iter iter
;
207 lttng_ht_lookup(sessions_ht
, &id
, &iter
);
208 node
= lttng_ht_iter_get_node_u64(&iter
);
210 DBG("Session find by ID %" PRIu64
" id NOT found", id
);
213 session
= caa_container_of(node
, struct relay_session
, session_n
);
214 DBG("Session find by ID %" PRIu64
" id found", id
);
215 if (!session_get(session
)) {
223 static void rcu_destroy_session(struct rcu_head
*rcu_head
)
225 struct relay_session
*session
=
226 caa_container_of(rcu_head
, struct relay_session
,
229 * Since each trace has a reference on the session, it means
230 * that if we are at the point where we teardown the session, no
231 * trace belonging to that session exist at this point.
232 * Calling lttng_ht_destroy in call_rcu worker thread so we
233 * don't hold the RCU read-side lock while calling it.
235 lttng_ht_destroy(session
->ctf_traces_ht
);
240 * Delete session from the given hash table.
242 * Return lttng ht del error code being 0 on success and 1 on failure.
244 static int session_delete(struct relay_session
*session
)
246 struct lttng_ht_iter iter
;
248 iter
.iter
.node
= &session
->session_n
.node
;
249 return lttng_ht_del(sessions_ht
, &iter
);
253 static void destroy_session(struct relay_session
*session
)
257 ret
= session_delete(session
);
259 lttng_trace_chunk_put(session
->current_trace_chunk
);
260 session
->current_trace_chunk
= NULL
;
261 lttng_trace_chunk_put(session
->pending_closure_trace_chunk
);
262 session
->pending_closure_trace_chunk
= NULL
;
263 ret
= sessiond_trace_chunk_registry_session_destroyed(
264 sessiond_trace_chunk_registry
, session
->sessiond_uuid
);
266 call_rcu(&session
->rcu_node
, rcu_destroy_session
);
269 void session_release(struct urcu_ref
*ref
)
271 struct relay_session
*session
=
272 caa_container_of(ref
, struct relay_session
, ref
);
274 destroy_session(session
);
277 void session_put(struct relay_session
*session
)
280 urcu_ref_put(&session
->ref
, session_release
);
284 int session_close(struct relay_session
*session
)
287 struct ctf_trace
*trace
;
288 struct lttng_ht_iter iter
;
289 struct relay_stream
*stream
;
291 pthread_mutex_lock(&session
->lock
);
292 DBG("closing session %" PRIu64
": is conn already closed %d",
293 session
->id
, session
->connection_closed
);
294 session
->connection_closed
= true;
295 pthread_mutex_unlock(&session
->lock
);
298 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
,
299 &iter
.iter
, trace
, node
.node
) {
300 ret
= ctf_trace_close(trace
);
305 cds_list_for_each_entry_rcu(stream
, &session
->recv_list
,
307 /* Close streams which have not been published yet. */
308 try_stream_close(stream
);
315 /* Put self-reference from create. */
316 session_put(session
);
320 int session_abort(struct relay_session
*session
)
328 pthread_mutex_lock(&session
->lock
);
329 DBG("aborting session %" PRIu64
, session
->id
);
330 session
->aborted
= true;
331 pthread_mutex_unlock(&session
->lock
);
335 void print_sessions(void)
337 struct lttng_ht_iter iter
;
338 struct relay_session
*session
;
345 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
347 if (!session_get(session
)) {
350 DBG("session %p refcount %ld session %" PRIu64
,
352 session
->ref
.refcount
,
354 session_put(session
);