tests: add base-path tests
[lttng-tools.git] / src / bin / lttng-relayd / session.h
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1#ifndef _SESSION_H
2#define _SESSION_H
3
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4/*
5 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
6 * David Goulet <dgoulet@efficios.com>
7591bab1 7 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License, version 2 only, as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 51
20 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
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23#include <limits.h>
24#include <inttypes.h>
25#include <pthread.h>
c3b7390b 26#include <urcu/list.h>
7591bab1 27#include <urcu/ref.h>
2f8f53af 28
36d2e35d 29#include <lttng/constant.h>
2f8f53af 30#include <common/hashtable/hashtable.h>
23c8ff50 31#include <common/compat/uuid.h>
639ddf68 32#include <common/trace-chunk.h>
1e791a74 33#include <common/optional.h>
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34
35/*
36 * Represents a session for the relay point of view
37 */
38struct relay_session {
39 /*
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40 * This session id is generated by the relay daemon to guarantee
41 * its uniqueness even when serving multiple session daemons.
42 * It is used to match a set of streams to their session.
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43 */
44 uint64_t id;
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45 /*
46 * ID of the session in the session daemon's domain.
47 * This information is only provided by 2.11+ peers.
48 */
49 LTTNG_OPTIONAL(uint64_t) id_sessiond;
50 /*
51 * Only provided by 2.11+ peers. However, the UUID is set to 'nil' in
52 * the other cases.
53 */
23c8ff50 54 lttng_uuid sessiond_uuid;
db1da059 55 LTTNG_OPTIONAL(time_t) creation_time;
36d2e35d 56 char session_name[LTTNG_NAME_MAX];
9cf3eb20 57 char hostname[LTTNG_HOST_NAME_MAX];
6fa5fe7c 58 char base_path[LTTNG_PATH_MAX];
2f8f53af 59 uint32_t live_timer;
2a174661 60
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61 /* Session in snapshot mode. */
62 bool snapshot;
63
64 /*
65 * Session has no back reference to its connection because it
66 * has a life-time that can be longer than the consumer connection's
67 * life-time; a reference can still be held by the viewer
68 * connection through the viewer streams.
69 */
70
71 struct urcu_ref ref;
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72
73 pthread_mutex_t lock;
74
75 /* major/minor version used for this session. */
76 uint32_t major;
77 uint32_t minor;
78
79 bool viewer_attached;
80 /* Tell if the session connection has been closed on the streaming side. */
81 bool connection_closed;
2a174661 82
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83 /*
84 * Tell if the session is currently living in a exiting relayd and
85 * should be cleaned forcefully without waiting for pending data or
86 * pending ctrl data.
87 */
88 bool aborted;
89
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90 /* Contains ctf_trace object of that session indexed by path name. */
91 struct lttng_ht *ctf_traces_ht;
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92
93 /*
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94 * This contains streams that are received on that connection.
95 * It's used to store them until we get the streams sent
96 * command. When this is received, we remove those streams from
97 * the list and publish them.
98 *
99 * Updates are protected by the recv_list_lock.
100 * Traversals are protected by RCU.
101 * recv_list_lock also protects stream_count.
2f8f53af 102 */
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103 struct cds_list_head recv_list; /* RCU list. */
104 uint32_t stream_count;
105 pthread_mutex_t recv_list_lock;
106
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107 /*
108 * Flag checked and exchanged with uatomic_cmpxchg to tell the
109 * viewer-side if new streams got added since the last check.
110 */
111 unsigned long new_streams;
112
113 /*
7591bab1 114 * Node in the global session hash table.
2f8f53af 115 */
7591bab1 116 struct lttng_ht_node_u64 session_n;
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117 /*
118 * Member of the session list in struct relay_viewer_session.
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119 * Updates are protected by the relay_viewer_session
120 * session_list_lock. Traversals are protected by RCU.
c3b7390b 121 */
7591bab1 122 struct cds_list_head viewer_session_node;
639ddf68 123 struct lttng_trace_chunk *current_trace_chunk;
62bad3bf 124 struct lttng_trace_chunk *pending_closure_trace_chunk;
7591bab1 125 struct rcu_head rcu_node; /* For call_rcu teardown. */
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126};
127
7591bab1 128struct relay_session *session_create(const char *session_name,
6fa5fe7c 129 const char *hostname, const char *base_path,
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130 uint32_t live_timer,
131 bool snapshot,
132 const lttng_uuid sessiond_uuid,
133 const uint64_t *id_sessiond,
134 const uint64_t *current_chunk_id,
135 const time_t *creation_time,
136 uint32_t major,
137 uint32_t minor);
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138struct relay_session *session_get_by_id(uint64_t id);
139bool session_get(struct relay_session *session);
140void session_put(struct relay_session *session);
2a174661 141
7591bab1 142int session_close(struct relay_session *session);
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143int session_abort(struct relay_session *session);
144
7591bab1 145void print_sessions(void);
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146
147#endif /* _SESSION_H */
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