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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> |
23c8ff50 | 31 | #include <common/compat/uuid.h> |
639ddf68 | 32 | #include <common/trace-chunk.h> |
1e791a74 | 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; | |
1e791a74 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 | */ | |
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]; |
ecd1a12f MD |
59 | /* |
60 | * Session output path relative to relayd's output path. | |
61 | * Will be empty when interacting with peers < 2.11 since their | |
62 | * streams' path are expressed relative to the relay daemon's | |
63 | * output path. | |
64 | */ | |
65 | char output_path[LTTNG_PATH_MAX]; | |
2f8f53af | 66 | uint32_t live_timer; |
2a174661 | 67 | |
7591bab1 MD |
68 | /* Session in snapshot mode. */ |
69 | bool snapshot; | |
70 | ||
71 | /* | |
72 | * Session has no back reference to its connection because it | |
73 | * has a life-time that can be longer than the consumer connection's | |
74 | * life-time; a reference can still be held by the viewer | |
75 | * connection through the viewer streams. | |
76 | */ | |
77 | ||
78 | struct urcu_ref ref; | |
7591bab1 MD |
79 | |
80 | pthread_mutex_t lock; | |
81 | ||
82 | /* major/minor version used for this session. */ | |
83 | uint32_t major; | |
84 | uint32_t minor; | |
85 | ||
86 | bool viewer_attached; | |
87 | /* Tell if the session connection has been closed on the streaming side. */ | |
88 | bool connection_closed; | |
2a174661 | 89 | |
98ba050e JR |
90 | /* |
91 | * Tell if the session is currently living in a exiting relayd and | |
92 | * should be cleaned forcefully without waiting for pending data or | |
93 | * pending ctrl data. | |
94 | */ | |
95 | bool aborted; | |
96 | ||
46ef2188 | 97 | bool session_name_contains_creation_time; |
ecd1a12f MD |
98 | /* Whether session has performed an explicit rotation. */ |
99 | bool has_rotated; | |
46ef2188 | 100 | |
2a174661 DG |
101 | /* Contains ctf_trace object of that session indexed by path name. */ |
102 | struct lttng_ht *ctf_traces_ht; | |
2f8f53af DG |
103 | |
104 | /* | |
7591bab1 MD |
105 | * This contains streams that are received on that connection. |
106 | * It's used to store them until we get the streams sent | |
107 | * command. When this is received, we remove those streams from | |
108 | * the list and publish them. | |
109 | * | |
110 | * Updates are protected by the recv_list_lock. | |
111 | * Traversals are protected by RCU. | |
112 | * recv_list_lock also protects stream_count. | |
2f8f53af | 113 | */ |
7591bab1 MD |
114 | struct cds_list_head recv_list; /* RCU list. */ |
115 | uint32_t stream_count; | |
116 | pthread_mutex_t recv_list_lock; | |
117 | ||
2f8f53af DG |
118 | /* |
119 | * Flag checked and exchanged with uatomic_cmpxchg to tell the | |
120 | * viewer-side if new streams got added since the last check. | |
121 | */ | |
122 | unsigned long new_streams; | |
123 | ||
124 | /* | |
7591bab1 | 125 | * Node in the global session hash table. |
2f8f53af | 126 | */ |
7591bab1 | 127 | struct lttng_ht_node_u64 session_n; |
c3b7390b JD |
128 | /* |
129 | * Member of the session list in struct relay_viewer_session. | |
7591bab1 MD |
130 | * Updates are protected by the relay_viewer_session |
131 | * session_list_lock. Traversals are protected by RCU. | |
c3b7390b | 132 | */ |
7591bab1 | 133 | struct cds_list_head viewer_session_node; |
639ddf68 | 134 | struct lttng_trace_chunk *current_trace_chunk; |
62bad3bf | 135 | struct lttng_trace_chunk *pending_closure_trace_chunk; |
7591bab1 | 136 | struct rcu_head rcu_node; /* For call_rcu teardown. */ |
2f8f53af DG |
137 | }; |
138 | ||
7591bab1 | 139 | struct relay_session *session_create(const char *session_name, |
6fa5fe7c | 140 | const char *hostname, const char *base_path, |
db1da059 JG |
141 | uint32_t live_timer, |
142 | bool snapshot, | |
143 | const lttng_uuid sessiond_uuid, | |
144 | const uint64_t *id_sessiond, | |
145 | const uint64_t *current_chunk_id, | |
146 | const time_t *creation_time, | |
147 | uint32_t major, | |
46ef2188 MD |
148 | uint32_t minor, |
149 | bool session_name_contains_creation_timestamp); | |
7591bab1 MD |
150 | struct relay_session *session_get_by_id(uint64_t id); |
151 | bool session_get(struct relay_session *session); | |
152 | void session_put(struct relay_session *session); | |
2a174661 | 153 | |
7591bab1 | 154 | int session_close(struct relay_session *session); |
98ba050e JR |
155 | int session_abort(struct relay_session *session); |
156 | ||
d37856b8 JR |
157 | int session_init_output_directory_handle(struct relay_session *session, |
158 | struct lttng_directory_handle *handle); | |
159 | ||
7591bab1 | 160 | void print_sessions(void); |
2f8f53af DG |
161 | |
162 | #endif /* _SESSION_H */ |