relayd: Transmit current trace chunk id in create_sesssion command
[lttng-tools.git] / src / bin / lttng-relayd / session.c
CommitLineData
2f8f53af
DG
1/*
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
7591bab1 4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2f8f53af
DG
5 *
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.
9 *
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
13 * more details.
14 *
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.
18 */
19
6c1c0768 20#define _LGPL_SOURCE
2a174661 21#include <common/common.h>
7591bab1 22#include <urcu/rculist.h>
2a174661 23
7591bab1 24#include "lttng-relayd.h"
2a174661 25#include "ctf-trace.h"
2f8f53af 26#include "session.h"
2a174661 27#include "stream.h"
23c8ff50 28#include "sessiond-trace-chunks.h"
2a174661
DG
29
30/* Global session id used in the session creation. */
31static uint64_t last_relay_session_id;
7591bab1 32static pthread_mutex_t last_relay_session_id_lock = PTHREAD_MUTEX_INITIALIZER;
2a174661
DG
33
34/*
35 * Create a new session by assigning a new session ID.
36 *
37 * Return allocated session or else NULL.
38 */
7591bab1
MD
39struct relay_session *session_create(const char *session_name,
40 const char *hostname, uint32_t live_timer,
23c8ff50
JG
41 bool snapshot, const lttng_uuid sessiond_uuid,
42 uint32_t major, uint32_t minor)
2a174661 43{
23c8ff50 44 int ret;
2a174661
DG
45 struct relay_session *session;
46
47 session = zmalloc(sizeof(*session));
48 if (!session) {
49 PERROR("relay session zmalloc");
50 goto error;
51 }
bb5d54e7
MD
52 if (lttng_strncpy(session->session_name, session_name,
53 sizeof(session->session_name))) {
54 goto error;
55 }
56 if (lttng_strncpy(session->hostname, hostname,
57 sizeof(session->hostname))) {
58 goto error;
59 }
2a174661
DG
60 session->ctf_traces_ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
61 if (!session->ctf_traces_ht) {
2a174661
DG
62 goto error;
63 }
64
7591bab1 65 pthread_mutex_lock(&last_relay_session_id_lock);
2a174661 66 session->id = ++last_relay_session_id;
7591bab1
MD
67 pthread_mutex_unlock(&last_relay_session_id_lock);
68
69 session->major = major;
70 session->minor = minor;
2a174661 71 lttng_ht_node_init_u64(&session->session_n, session->id);
7591bab1
MD
72 urcu_ref_init(&session->ref);
73 CDS_INIT_LIST_HEAD(&session->recv_list);
74 pthread_mutex_init(&session->lock, NULL);
7591bab1
MD
75 pthread_mutex_init(&session->recv_list_lock, NULL);
76
7591bab1
MD
77 session->live_timer = live_timer;
78 session->snapshot = snapshot;
23c8ff50
JG
79 lttng_uuid_copy(session->sessiond_uuid, sessiond_uuid);
80
81 ret = sessiond_trace_chunk_registry_session_created(
82 sessiond_trace_chunk_registry, sessiond_uuid);
83 if (ret) {
84 goto error;
85 }
7591bab1
MD
86
87 lttng_ht_add_unique_u64(sessions_ht, &session->session_n);
bb5d54e7 88 return session;
2a174661
DG
89
90error:
bb5d54e7
MD
91 free(session);
92 return NULL;
2a174661 93}
2f8f53af 94
7591bab1
MD
95/* Should be called with RCU read-side lock held. */
96bool session_get(struct relay_session *session)
97{
ce4d4083 98 return urcu_ref_get_unless_zero(&session->ref);
7591bab1
MD
99}
100
2f8f53af 101/*
7591bab1
MD
102 * Lookup a session within the session hash table using the session id
103 * as key. A session reference is taken when a session is returned.
104 * session_put() must be called on that session.
2f8f53af
DG
105 *
106 * Return session or NULL if not found.
107 */
7591bab1 108struct relay_session *session_get_by_id(uint64_t id)
2f8f53af
DG
109{
110 struct relay_session *session = NULL;
2a174661 111 struct lttng_ht_node_u64 *node;
2f8f53af
DG
112 struct lttng_ht_iter iter;
113
7591bab1
MD
114 rcu_read_lock();
115 lttng_ht_lookup(sessions_ht, &id, &iter);
2a174661 116 node = lttng_ht_iter_get_node_u64(&iter);
2f8f53af 117 if (!node) {
2a174661 118 DBG("Session find by ID %" PRIu64 " id NOT found", id);
2f8f53af
DG
119 goto end;
120 }
121 session = caa_container_of(node, struct relay_session, session_n);
2a174661 122 DBG("Session find by ID %" PRIu64 " id found", id);
7591bab1
MD
123 if (!session_get(session)) {
124 session = NULL;
125 }
2f8f53af 126end:
7591bab1 127 rcu_read_unlock();
2f8f53af
DG
128 return session;
129}
2a174661 130
7591bab1
MD
131static void rcu_destroy_session(struct rcu_head *rcu_head)
132{
133 struct relay_session *session =
134 caa_container_of(rcu_head, struct relay_session,
135 rcu_node);
49e614cb
MD
136 /*
137 * Since each trace has a reference on the session, it means
138 * that if we are at the point where we teardown the session, no
139 * trace belonging to that session exist at this point.
140 * Calling lttng_ht_destroy in call_rcu worker thread so we
141 * don't hold the RCU read-side lock while calling it.
142 */
143 lttng_ht_destroy(session->ctf_traces_ht);
7591bab1
MD
144 free(session);
145}
146
2a174661
DG
147/*
148 * Delete session from the given hash table.
149 *
150 * Return lttng ht del error code being 0 on success and 1 on failure.
151 */
7591bab1 152static int session_delete(struct relay_session *session)
2a174661
DG
153{
154 struct lttng_ht_iter iter;
155
2a174661 156 iter.iter.node = &session->session_n.node;
7591bab1 157 return lttng_ht_del(sessions_ht, &iter);
2a174661
DG
158}
159
7591bab1
MD
160
161static void destroy_session(struct relay_session *session)
162{
163 int ret;
164
165 ret = session_delete(session);
166 assert(!ret);
639ddf68 167 lttng_trace_chunk_put(session->current_trace_chunk);
23c8ff50
JG
168 ret = sessiond_trace_chunk_registry_session_destroyed(
169 sessiond_trace_chunk_registry, session->sessiond_uuid);
170 assert(!ret);
639ddf68
JG
171 lttng_trace_chunk_put(session->current_trace_chunk);
172 session->current_trace_chunk = NULL;
7591bab1
MD
173 call_rcu(&session->rcu_node, rcu_destroy_session);
174}
175
176void session_release(struct urcu_ref *ref)
2a174661 177{
7591bab1
MD
178 struct relay_session *session =
179 caa_container_of(ref, struct relay_session, ref);
2a174661 180
7591bab1
MD
181 destroy_session(session);
182}
2a174661 183
7591bab1
MD
184void session_put(struct relay_session *session)
185{
186 rcu_read_lock();
7591bab1 187 urcu_ref_put(&session->ref, session_release);
7591bab1 188 rcu_read_unlock();
2a174661
DG
189}
190
7591bab1 191int session_close(struct relay_session *session)
2a174661
DG
192{
193 int ret = 0;
7591bab1
MD
194 struct ctf_trace *trace;
195 struct lttng_ht_iter iter;
196 struct relay_stream *stream;
197
198 pthread_mutex_lock(&session->lock);
199 DBG("closing session %" PRIu64 ": is conn already closed %d",
200 session->id, session->connection_closed);
7591bab1 201 session->connection_closed = true;
7591bab1 202 pthread_mutex_unlock(&session->lock);
2a174661 203
7591bab1
MD
204 rcu_read_lock();
205 cds_lfht_for_each_entry(session->ctf_traces_ht->ht,
206 &iter.iter, trace, node.node) {
207 ret = ctf_trace_close(trace);
208 if (ret) {
209 goto rcu_unlock;
2a174661
DG
210 }
211 }
7591bab1
MD
212 cds_list_for_each_entry_rcu(stream, &session->recv_list,
213 recv_node) {
bda7c7b9
JG
214 /* Close streams which have not been published yet. */
215 try_stream_close(stream);
7591bab1
MD
216 }
217rcu_unlock:
218 rcu_read_unlock();
219 if (ret) {
220 return ret;
221 }
222 /* Put self-reference from create. */
223 session_put(session);
224 return ret;
2a174661
DG
225}
226
98ba050e
JR
227int session_abort(struct relay_session *session)
228{
229 int ret = 0;
230
231 if (!session) {
232 return 0;
233 }
234
235 pthread_mutex_lock(&session->lock);
236 DBG("aborting session %" PRIu64, session->id);
98ba050e 237 session->aborted = true;
98ba050e
JR
238 pthread_mutex_unlock(&session->lock);
239 return ret;
240}
241
7591bab1 242void print_sessions(void)
2a174661 243{
2a174661 244 struct lttng_ht_iter iter;
7591bab1 245 struct relay_session *session;
2a174661 246
ce3f3ba3
JG
247 if (!sessions_ht) {
248 return;
249 }
250
2a174661 251 rcu_read_lock();
7591bab1
MD
252 cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session,
253 session_n.node) {
254 if (!session_get(session)) {
255 continue;
256 }
257 DBG("session %p refcount %ld session %" PRIu64,
258 session,
259 session->ref.refcount,
260 session->id);
261 session_put(session);
2a174661 262 }
2a174661 263 rcu_read_unlock();
2a174661 264}
This page took 0.082102 seconds and 4 git commands to generate.