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/compat/uuid.h>
23 #include <urcu/rculist.h>
25 #include "lttng-relayd.h"
26 #include "ctf-trace.h"
29 #include "sessiond-trace-chunks.h"
31 /* Global session id used in the session creation. */
32 static uint64_t last_relay_session_id
;
33 static pthread_mutex_t last_relay_session_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
35 static int session_set_anonymous_chunk(struct relay_session
*session
)
38 struct lttng_trace_chunk
*chunk
= NULL
;
39 enum lttng_trace_chunk_status status
;
40 struct lttng_directory_handle output_directory
;
42 ret
= lttng_directory_handle_init(&output_directory
, opt_output_path
);
47 chunk
= lttng_trace_chunk_create_anonymous();
52 status
= lttng_trace_chunk_set_credentials_current_user(chunk
);
53 if (status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
58 status
= lttng_trace_chunk_set_as_owner(chunk
, &output_directory
);
59 if (status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
63 session
->current_trace_chunk
= chunk
;
66 lttng_trace_chunk_put(chunk
);
67 lttng_directory_handle_fini(&output_directory
);
72 * Create a new session by assigning a new session ID.
74 * Return allocated session or else NULL.
76 struct relay_session
*session_create(const char *session_name
,
77 const char *hostname
, uint32_t live_timer
,
78 bool snapshot
, const lttng_uuid sessiond_uuid
,
79 uint64_t *id_sessiond
, uint64_t *current_chunk_id
,
80 uint32_t major
, uint32_t minor
)
83 struct relay_session
*session
;
85 session
= zmalloc(sizeof(*session
));
87 PERROR("Failed to allocate session");
90 if (lttng_strncpy(session
->session_name
, session_name
,
91 sizeof(session
->session_name
))) {
92 WARN("Session name exceeds maximal allowed length");
95 if (lttng_strncpy(session
->hostname
, hostname
,
96 sizeof(session
->hostname
))) {
97 WARN("Hostname exceeds maximal allowed length");
100 session
->ctf_traces_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
101 if (!session
->ctf_traces_ht
) {
105 pthread_mutex_lock(&last_relay_session_id_lock
);
106 session
->id
= ++last_relay_session_id
;
107 pthread_mutex_unlock(&last_relay_session_id_lock
);
109 session
->major
= major
;
110 session
->minor
= minor
;
111 lttng_ht_node_init_u64(&session
->session_n
, session
->id
);
112 urcu_ref_init(&session
->ref
);
113 CDS_INIT_LIST_HEAD(&session
->recv_list
);
114 pthread_mutex_init(&session
->lock
, NULL
);
115 pthread_mutex_init(&session
->recv_list_lock
, NULL
);
117 session
->live_timer
= live_timer
;
118 session
->snapshot
= snapshot
;
119 lttng_uuid_copy(session
->sessiond_uuid
, sessiond_uuid
);
122 LTTNG_OPTIONAL_SET(&session
->id_sessiond
, *id_sessiond
);
125 ret
= sessiond_trace_chunk_registry_session_created(
126 sessiond_trace_chunk_registry
, sessiond_uuid
);
131 if (id_sessiond
&& current_chunk_id
) {
132 session
->current_trace_chunk
=
133 sessiond_trace_chunk_registry_get_chunk(
134 sessiond_trace_chunk_registry
,
135 session
->sessiond_uuid
,
136 session
->id_sessiond
.value
,
138 if (!session
->current_trace_chunk
) {
139 char uuid_str
[UUID_STR_LEN
];
141 lttng_uuid_to_str(sessiond_uuid
, uuid_str
);
142 ERR("Could not find trace chunk: sessiond = {%s}, sessiond session id = %" PRIu64
", trace chunk id = %" PRIu64
,
143 uuid_str
, *id_sessiond
,
146 } else if (!id_sessiond
) {
148 * Pre-2.11 peers will not announce trace chunks. An
149 * anonymous trace chunk which will remain set for the
150 * duration of the session is created.
152 ret
= session_set_anonymous_chunk(session
);
158 lttng_ht_add_unique_u64(sessions_ht
, &session
->session_n
);
162 session_put(session
);
166 /* Should be called with RCU read-side lock held. */
167 bool session_get(struct relay_session
*session
)
169 return urcu_ref_get_unless_zero(&session
->ref
);
173 * Lookup a session within the session hash table using the session id
174 * as key. A session reference is taken when a session is returned.
175 * session_put() must be called on that session.
177 * Return session or NULL if not found.
179 struct relay_session
*session_get_by_id(uint64_t id
)
181 struct relay_session
*session
= NULL
;
182 struct lttng_ht_node_u64
*node
;
183 struct lttng_ht_iter iter
;
186 lttng_ht_lookup(sessions_ht
, &id
, &iter
);
187 node
= lttng_ht_iter_get_node_u64(&iter
);
189 DBG("Session find by ID %" PRIu64
" id NOT found", id
);
192 session
= caa_container_of(node
, struct relay_session
, session_n
);
193 DBG("Session find by ID %" PRIu64
" id found", id
);
194 if (!session_get(session
)) {
202 static void rcu_destroy_session(struct rcu_head
*rcu_head
)
204 struct relay_session
*session
=
205 caa_container_of(rcu_head
, struct relay_session
,
208 * Since each trace has a reference on the session, it means
209 * that if we are at the point where we teardown the session, no
210 * trace belonging to that session exist at this point.
211 * Calling lttng_ht_destroy in call_rcu worker thread so we
212 * don't hold the RCU read-side lock while calling it.
214 lttng_ht_destroy(session
->ctf_traces_ht
);
219 * Delete session from the given hash table.
221 * Return lttng ht del error code being 0 on success and 1 on failure.
223 static int session_delete(struct relay_session
*session
)
225 struct lttng_ht_iter iter
;
227 iter
.iter
.node
= &session
->session_n
.node
;
228 return lttng_ht_del(sessions_ht
, &iter
);
232 static void destroy_session(struct relay_session
*session
)
236 ret
= session_delete(session
);
238 lttng_trace_chunk_put(session
->current_trace_chunk
);
239 ret
= sessiond_trace_chunk_registry_session_destroyed(
240 sessiond_trace_chunk_registry
, session
->sessiond_uuid
);
242 lttng_trace_chunk_put(session
->current_trace_chunk
);
243 session
->current_trace_chunk
= NULL
;
244 call_rcu(&session
->rcu_node
, rcu_destroy_session
);
247 void session_release(struct urcu_ref
*ref
)
249 struct relay_session
*session
=
250 caa_container_of(ref
, struct relay_session
, ref
);
252 destroy_session(session
);
255 void session_put(struct relay_session
*session
)
258 urcu_ref_put(&session
->ref
, session_release
);
262 int session_close(struct relay_session
*session
)
265 struct ctf_trace
*trace
;
266 struct lttng_ht_iter iter
;
267 struct relay_stream
*stream
;
269 pthread_mutex_lock(&session
->lock
);
270 DBG("closing session %" PRIu64
": is conn already closed %d",
271 session
->id
, session
->connection_closed
);
272 session
->connection_closed
= true;
273 pthread_mutex_unlock(&session
->lock
);
276 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
,
277 &iter
.iter
, trace
, node
.node
) {
278 ret
= ctf_trace_close(trace
);
283 cds_list_for_each_entry_rcu(stream
, &session
->recv_list
,
285 /* Close streams which have not been published yet. */
286 try_stream_close(stream
);
293 /* Put self-reference from create. */
294 session_put(session
);
298 int session_abort(struct relay_session
*session
)
306 pthread_mutex_lock(&session
->lock
);
307 DBG("aborting session %" PRIu64
, session
->id
);
308 session
->aborted
= true;
309 pthread_mutex_unlock(&session
->lock
);
313 void print_sessions(void)
315 struct lttng_ht_iter iter
;
316 struct relay_session
*session
;
323 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
325 if (!session_get(session
)) {
328 DBG("session %p refcount %ld session %" PRIu64
,
330 session
->ref
.refcount
,
332 session_put(session
);