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7591bab1 MD |
1 | #ifndef _SESSION_H |
2 | #define _SESSION_H | |
3 | ||
2f8f53af DG |
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> |
2f8f53af DG |
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 | ||
2f8f53af DG |
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> |
1f916b5d | 31 | #include <common/compat/uuid.h> |
86bc527a | 32 | #include <common/trace-chunk.h> |
b2c25d00 | 33 | #include <common/optional.h> |
2f8f53af DG |
34 | |
35 | /* | |
36 | * Represents a session for the relay point of view | |
37 | */ | |
38 | struct relay_session { | |
39 | /* | |
7591bab1 MD |
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. | |
2f8f53af DG |
43 | */ |
44 | uint64_t id; | |
b2c25d00 JG |
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 | */ | |
1f916b5d | 54 | lttng_uuid sessiond_uuid; |
0fb564b1 | 55 | LTTNG_OPTIONAL(time_t) creation_time; |
36d2e35d | 56 | char session_name[LTTNG_NAME_MAX]; |
9cf3eb20 | 57 | char hostname[LTTNG_HOST_NAME_MAX]; |
6ef36453 | 58 | char base_path[LTTNG_PATH_MAX]; |
2f8f53af | 59 | uint32_t live_timer; |
2a174661 | 60 | |
7591bab1 MD |
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; | |
7591bab1 MD |
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 | |
98ba050e JR |
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 | ||
55ce50b6 MD |
90 | bool session_name_contains_creation_time; |
91 | ||
2a174661 DG |
92 | /* Contains ctf_trace object of that session indexed by path name. */ |
93 | struct lttng_ht *ctf_traces_ht; | |
2f8f53af DG |
94 | |
95 | /* | |
7591bab1 MD |
96 | * This contains streams that are received on that connection. |
97 | * It's used to store them until we get the streams sent | |
98 | * command. When this is received, we remove those streams from | |
99 | * the list and publish them. | |
100 | * | |
101 | * Updates are protected by the recv_list_lock. | |
102 | * Traversals are protected by RCU. | |
103 | * recv_list_lock also protects stream_count. | |
2f8f53af | 104 | */ |
7591bab1 MD |
105 | struct cds_list_head recv_list; /* RCU list. */ |
106 | uint32_t stream_count; | |
107 | pthread_mutex_t recv_list_lock; | |
108 | ||
2f8f53af DG |
109 | /* |
110 | * Flag checked and exchanged with uatomic_cmpxchg to tell the | |
111 | * viewer-side if new streams got added since the last check. | |
112 | */ | |
113 | unsigned long new_streams; | |
114 | ||
115 | /* | |
7591bab1 | 116 | * Node in the global session hash table. |
2f8f53af | 117 | */ |
7591bab1 | 118 | struct lttng_ht_node_u64 session_n; |
c3b7390b JD |
119 | /* |
120 | * Member of the session list in struct relay_viewer_session. | |
7591bab1 MD |
121 | * Updates are protected by the relay_viewer_session |
122 | * session_list_lock. Traversals are protected by RCU. | |
c3b7390b | 123 | */ |
7591bab1 | 124 | struct cds_list_head viewer_session_node; |
86bc527a | 125 | struct lttng_trace_chunk *current_trace_chunk; |
a57bb1b0 | 126 | struct lttng_trace_chunk *pending_closure_trace_chunk; |
7591bab1 | 127 | struct rcu_head rcu_node; /* For call_rcu teardown. */ |
2f8f53af DG |
128 | }; |
129 | ||
7591bab1 | 130 | struct relay_session *session_create(const char *session_name, |
6ef36453 | 131 | const char *hostname, const char *base_path, |
0fb564b1 JG |
132 | uint32_t live_timer, |
133 | bool snapshot, | |
134 | const lttng_uuid sessiond_uuid, | |
135 | const uint64_t *id_sessiond, | |
136 | const uint64_t *current_chunk_id, | |
137 | const time_t *creation_time, | |
138 | uint32_t major, | |
55ce50b6 MD |
139 | uint32_t minor, |
140 | bool session_name_contains_creation_timestamp); | |
7591bab1 MD |
141 | struct relay_session *session_get_by_id(uint64_t id); |
142 | bool session_get(struct relay_session *session); | |
143 | void session_put(struct relay_session *session); | |
2a174661 | 144 | |
7591bab1 | 145 | int session_close(struct relay_session *session); |
98ba050e JR |
146 | int session_abort(struct relay_session *session); |
147 | ||
7591bab1 | 148 | void print_sessions(void); |
2f8f53af DG |
149 | |
150 | #endif /* _SESSION_H */ |