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7591bab1 MD |
1 | #ifndef _SESSION_H |
2 | #define _SESSION_H | |
3 | ||
2f8f53af | 4 | /* |
ab5be9fa MJ |
5 | * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com> |
6 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> | |
7 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
2f8f53af | 8 | * |
ab5be9fa | 9 | * SPDX-License-Identifier: GPL-2.0-only |
2f8f53af | 10 | * |
2f8f53af DG |
11 | */ |
12 | ||
2f8f53af DG |
13 | #include <limits.h> |
14 | #include <inttypes.h> | |
15 | #include <pthread.h> | |
c3b7390b | 16 | #include <urcu/list.h> |
7591bab1 | 17 | #include <urcu/ref.h> |
2f8f53af | 18 | |
36d2e35d | 19 | #include <lttng/constant.h> |
2f8f53af | 20 | #include <common/hashtable/hashtable.h> |
c70636a7 | 21 | #include <common/uuid.h> |
639ddf68 | 22 | #include <common/trace-chunk.h> |
1e791a74 | 23 | #include <common/optional.h> |
2f8f53af DG |
24 | |
25 | /* | |
26 | * Represents a session for the relay point of view | |
27 | */ | |
28 | struct relay_session { | |
29 | /* | |
7591bab1 MD |
30 | * This session id is generated by the relay daemon to guarantee |
31 | * its uniqueness even when serving multiple session daemons. | |
32 | * It is used to match a set of streams to their session. | |
2f8f53af DG |
33 | */ |
34 | uint64_t id; | |
1e791a74 JG |
35 | /* |
36 | * ID of the session in the session daemon's domain. | |
37 | * This information is only provided by 2.11+ peers. | |
38 | */ | |
39 | LTTNG_OPTIONAL(uint64_t) id_sessiond; | |
40 | /* | |
41 | * Only provided by 2.11+ peers. However, the UUID is set to 'nil' in | |
42 | * the other cases. | |
43 | */ | |
23c8ff50 | 44 | lttng_uuid sessiond_uuid; |
db1da059 | 45 | LTTNG_OPTIONAL(time_t) creation_time; |
e7f8eff3 | 46 | /* Must _not_ be empty for 2.4+ peers. */ |
36d2e35d | 47 | char session_name[LTTNG_NAME_MAX]; |
9cf3eb20 | 48 | char hostname[LTTNG_HOST_NAME_MAX]; |
6fa5fe7c | 49 | char base_path[LTTNG_PATH_MAX]; |
ecd1a12f MD |
50 | /* |
51 | * Session output path relative to relayd's output path. | |
52 | * Will be empty when interacting with peers < 2.11 since their | |
53 | * streams' path are expressed relative to the relay daemon's | |
54 | * output path. | |
55 | */ | |
56 | char output_path[LTTNG_PATH_MAX]; | |
2f8f53af | 57 | uint32_t live_timer; |
2a174661 | 58 | |
7591bab1 MD |
59 | /* Session in snapshot mode. */ |
60 | bool snapshot; | |
61 | ||
62 | /* | |
63 | * Session has no back reference to its connection because it | |
64 | * has a life-time that can be longer than the consumer connection's | |
65 | * life-time; a reference can still be held by the viewer | |
66 | * connection through the viewer streams. | |
67 | */ | |
68 | ||
69 | struct urcu_ref ref; | |
7591bab1 MD |
70 | |
71 | pthread_mutex_t lock; | |
72 | ||
73 | /* major/minor version used for this session. */ | |
74 | uint32_t major; | |
75 | uint32_t minor; | |
76 | ||
77 | bool viewer_attached; | |
78 | /* Tell if the session connection has been closed on the streaming side. */ | |
79 | bool connection_closed; | |
2a174661 | 80 | |
98ba050e JR |
81 | /* |
82 | * Tell if the session is currently living in a exiting relayd and | |
83 | * should be cleaned forcefully without waiting for pending data or | |
84 | * pending ctrl data. | |
85 | */ | |
86 | bool aborted; | |
87 | ||
46ef2188 | 88 | bool session_name_contains_creation_time; |
ecd1a12f MD |
89 | /* Whether session has performed an explicit rotation. */ |
90 | bool has_rotated; | |
46ef2188 | 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; |
639ddf68 | 125 | struct lttng_trace_chunk *current_trace_chunk; |
62bad3bf | 126 | struct lttng_trace_chunk *pending_closure_trace_chunk; |
a7ceb342 MD |
127 | /* |
128 | * Prevent live viewers from taking of copy of the chunk | |
129 | * while new chunk has a temporary directory name. | |
130 | */ | |
131 | bool ongoing_rotation; | |
7ceefac4 | 132 | struct lttng_directory_handle *output_directory; |
7591bab1 | 133 | struct rcu_head rcu_node; /* For call_rcu teardown. */ |
2f8f53af DG |
134 | }; |
135 | ||
7591bab1 | 136 | struct relay_session *session_create(const char *session_name, |
6fa5fe7c | 137 | const char *hostname, const char *base_path, |
db1da059 JG |
138 | uint32_t live_timer, |
139 | bool snapshot, | |
140 | const lttng_uuid sessiond_uuid, | |
141 | const uint64_t *id_sessiond, | |
142 | const uint64_t *current_chunk_id, | |
143 | const time_t *creation_time, | |
144 | uint32_t major, | |
46ef2188 MD |
145 | uint32_t minor, |
146 | bool session_name_contains_creation_timestamp); | |
7591bab1 MD |
147 | struct relay_session *session_get_by_id(uint64_t id); |
148 | bool session_get(struct relay_session *session); | |
149 | void session_put(struct relay_session *session); | |
2a174661 | 150 | |
7591bab1 | 151 | int session_close(struct relay_session *session); |
98ba050e JR |
152 | int session_abort(struct relay_session *session); |
153 | ||
7591bab1 | 154 | void print_sessions(void); |
2f8f53af DG |
155 | |
156 | #endif /* _SESSION_H */ |