Commit | Line | Data |
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2f8f53af DG |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
5a693d30 | 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 | ||
2a174661 | 20 | #define _GNU_SOURCE |
6c1c0768 | 21 | #define _LGPL_SOURCE |
2a174661 | 22 | #include <common/common.h> |
5a693d30 | 23 | #include <urcu/rculist.h> |
2a174661 | 24 | |
5a693d30 | 25 | #include "lttng-relayd.h" |
2a174661 | 26 | #include "ctf-trace.h" |
2f8f53af | 27 | #include "session.h" |
2a174661 DG |
28 | #include "stream.h" |
29 | ||
30 | /* Global session id used in the session creation. */ | |
31 | static uint64_t last_relay_session_id; | |
5a693d30 | 32 | static 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 | */ | |
5a693d30 MD |
39 | struct relay_session *session_create(const char *session_name, |
40 | const char *hostname, uint32_t live_timer, | |
41 | bool snapshot, uint32_t major, uint32_t minor) | |
2a174661 DG |
42 | { |
43 | struct relay_session *session; | |
44 | ||
45 | session = zmalloc(sizeof(*session)); | |
46 | if (!session) { | |
47 | PERROR("relay session zmalloc"); | |
48 | goto error; | |
49 | } | |
2e8d52df MD |
50 | if (lttng_strncpy(session->session_name, session_name, |
51 | sizeof(session->session_name))) { | |
52 | goto error; | |
53 | } | |
54 | if (lttng_strncpy(session->hostname, hostname, | |
55 | sizeof(session->hostname))) { | |
56 | goto error; | |
57 | } | |
2a174661 DG |
58 | session->ctf_traces_ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
59 | if (!session->ctf_traces_ht) { | |
2a174661 DG |
60 | goto error; |
61 | } | |
62 | ||
5a693d30 | 63 | pthread_mutex_lock(&last_relay_session_id_lock); |
2a174661 | 64 | session->id = ++last_relay_session_id; |
5a693d30 MD |
65 | pthread_mutex_unlock(&last_relay_session_id_lock); |
66 | ||
67 | session->major = major; | |
68 | session->minor = minor; | |
2a174661 | 69 | lttng_ht_node_init_u64(&session->session_n, session->id); |
5a693d30 MD |
70 | urcu_ref_init(&session->ref); |
71 | CDS_INIT_LIST_HEAD(&session->recv_list); | |
72 | pthread_mutex_init(&session->lock, NULL); | |
73 | pthread_mutex_init(&session->reflock, NULL); | |
74 | pthread_mutex_init(&session->recv_list_lock, NULL); | |
75 | ||
5a693d30 MD |
76 | session->live_timer = live_timer; |
77 | session->snapshot = snapshot; | |
78 | ||
79 | lttng_ht_add_unique_u64(sessions_ht, &session->session_n); | |
2e8d52df | 80 | return session; |
2a174661 DG |
81 | |
82 | error: | |
2e8d52df MD |
83 | free(session); |
84 | return NULL; | |
2a174661 | 85 | } |
2f8f53af | 86 | |
5a693d30 MD |
87 | /* Should be called with RCU read-side lock held. */ |
88 | bool session_get(struct relay_session *session) | |
89 | { | |
90 | bool has_ref = false; | |
91 | ||
92 | pthread_mutex_lock(&session->reflock); | |
93 | if (session->ref.refcount != 0) { | |
94 | has_ref = true; | |
95 | urcu_ref_get(&session->ref); | |
96 | } | |
97 | pthread_mutex_unlock(&session->reflock); | |
98 | ||
99 | return has_ref; | |
100 | } | |
101 | ||
2f8f53af | 102 | /* |
5a693d30 MD |
103 | * Lookup a session within the session hash table using the session id |
104 | * as key. A session reference is taken when a session is returned. | |
105 | * session_put() must be called on that session. | |
2f8f53af DG |
106 | * |
107 | * Return session or NULL if not found. | |
108 | */ | |
5a693d30 | 109 | struct relay_session *session_get_by_id(uint64_t id) |
2f8f53af DG |
110 | { |
111 | struct relay_session *session = NULL; | |
2a174661 | 112 | struct lttng_ht_node_u64 *node; |
2f8f53af DG |
113 | struct lttng_ht_iter iter; |
114 | ||
5a693d30 MD |
115 | rcu_read_lock(); |
116 | lttng_ht_lookup(sessions_ht, &id, &iter); | |
2a174661 | 117 | node = lttng_ht_iter_get_node_u64(&iter); |
2f8f53af | 118 | if (!node) { |
2a174661 | 119 | DBG("Session find by ID %" PRIu64 " id NOT found", id); |
2f8f53af DG |
120 | goto end; |
121 | } | |
122 | session = caa_container_of(node, struct relay_session, session_n); | |
2a174661 | 123 | DBG("Session find by ID %" PRIu64 " id found", id); |
5a693d30 MD |
124 | if (!session_get(session)) { |
125 | session = NULL; | |
126 | } | |
2f8f53af | 127 | end: |
5a693d30 | 128 | rcu_read_unlock(); |
2f8f53af DG |
129 | return session; |
130 | } | |
2a174661 | 131 | |
5a693d30 MD |
132 | static void rcu_destroy_session(struct rcu_head *rcu_head) |
133 | { | |
134 | struct relay_session *session = | |
135 | caa_container_of(rcu_head, struct relay_session, | |
136 | rcu_node); | |
c65ce455 MD |
137 | /* |
138 | * Since each trace has a reference on the session, it means | |
139 | * that if we are at the point where we teardown the session, no | |
140 | * trace belonging to that session exist at this point. | |
141 | * Calling lttng_ht_destroy in call_rcu worker thread so we | |
142 | * don't hold the RCU read-side lock while calling it. | |
143 | */ | |
144 | lttng_ht_destroy(session->ctf_traces_ht); | |
5a693d30 MD |
145 | free(session); |
146 | } | |
147 | ||
2a174661 DG |
148 | /* |
149 | * Delete session from the given hash table. | |
150 | * | |
151 | * Return lttng ht del error code being 0 on success and 1 on failure. | |
152 | */ | |
5a693d30 | 153 | static int session_delete(struct relay_session *session) |
2a174661 DG |
154 | { |
155 | struct lttng_ht_iter iter; | |
156 | ||
2a174661 | 157 | iter.iter.node = &session->session_n.node; |
5a693d30 | 158 | return lttng_ht_del(sessions_ht, &iter); |
2a174661 DG |
159 | } |
160 | ||
5a693d30 MD |
161 | |
162 | static void destroy_session(struct relay_session *session) | |
163 | { | |
164 | int ret; | |
165 | ||
166 | ret = session_delete(session); | |
167 | assert(!ret); | |
5a693d30 MD |
168 | call_rcu(&session->rcu_node, rcu_destroy_session); |
169 | } | |
170 | ||
171 | void session_release(struct urcu_ref *ref) | |
2a174661 | 172 | { |
5a693d30 MD |
173 | struct relay_session *session = |
174 | caa_container_of(ref, struct relay_session, ref); | |
2a174661 | 175 | |
5a693d30 MD |
176 | destroy_session(session); |
177 | } | |
2a174661 | 178 | |
5a693d30 MD |
179 | void session_put(struct relay_session *session) |
180 | { | |
181 | rcu_read_lock(); | |
182 | pthread_mutex_lock(&session->reflock); | |
183 | urcu_ref_put(&session->ref, session_release); | |
184 | pthread_mutex_unlock(&session->reflock); | |
185 | rcu_read_unlock(); | |
2a174661 DG |
186 | } |
187 | ||
5a693d30 | 188 | int session_close(struct relay_session *session) |
2a174661 DG |
189 | { |
190 | int ret = 0; | |
5a693d30 MD |
191 | struct ctf_trace *trace; |
192 | struct lttng_ht_iter iter; | |
193 | struct relay_stream *stream; | |
194 | ||
195 | pthread_mutex_lock(&session->lock); | |
196 | DBG("closing session %" PRIu64 ": is conn already closed %d", | |
197 | session->id, session->connection_closed); | |
198 | if (session->connection_closed) { | |
199 | ret = -1; | |
200 | goto unlock; | |
201 | } | |
202 | session->connection_closed = true; | |
203 | unlock: | |
204 | pthread_mutex_unlock(&session->lock); | |
205 | if (ret) { | |
206 | return ret; | |
207 | } | |
2a174661 | 208 | |
5a693d30 MD |
209 | rcu_read_lock(); |
210 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, | |
211 | &iter.iter, trace, node.node) { | |
212 | ret = ctf_trace_close(trace); | |
213 | if (ret) { | |
214 | goto rcu_unlock; | |
2a174661 DG |
215 | } |
216 | } | |
5a693d30 MD |
217 | cds_list_for_each_entry_rcu(stream, &session->recv_list, |
218 | recv_node) { | |
a08107cc JG |
219 | /* Close streams which have not been published yet. */ |
220 | try_stream_close(stream); | |
5a693d30 MD |
221 | } |
222 | rcu_unlock: | |
223 | rcu_read_unlock(); | |
224 | if (ret) { | |
225 | return ret; | |
226 | } | |
227 | /* Put self-reference from create. */ | |
228 | session_put(session); | |
229 | return ret; | |
2a174661 DG |
230 | } |
231 | ||
5a693d30 | 232 | void print_sessions(void) |
2a174661 | 233 | { |
2a174661 | 234 | struct lttng_ht_iter iter; |
5a693d30 | 235 | struct relay_session *session; |
2a174661 | 236 | |
d71e55a5 JG |
237 | if (!sessions_ht) { |
238 | return; | |
239 | } | |
240 | ||
2a174661 | 241 | rcu_read_lock(); |
5a693d30 MD |
242 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, |
243 | session_n.node) { | |
244 | if (!session_get(session)) { | |
245 | continue; | |
246 | } | |
247 | DBG("session %p refcount %ld session %" PRIu64, | |
248 | session, | |
249 | session->ref.refcount, | |
250 | session->id); | |
251 | session_put(session); | |
2a174661 | 252 | } |
2a174661 | 253 | rcu_read_unlock(); |
2a174661 | 254 | } |