Fix: relayd: rotation failure for multi-domain session
[lttng-tools.git] / src / bin / lttng-relayd / session.h
1 #ifndef _SESSION_H
2 #define _SESSION_H
3
4 /*
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>
8 *
9 * SPDX-License-Identifier: GPL-2.0-only
10 *
11 */
12
13 #include <limits.h>
14 #include <inttypes.h>
15 #include <pthread.h>
16 #include <urcu/list.h>
17 #include <urcu/ref.h>
18
19 #include <lttng/constant.h>
20 #include <common/hashtable/hashtable.h>
21 #include <common/uuid.h>
22 #include <common/trace-chunk.h>
23 #include <common/optional.h>
24
25 /*
26 * Represents a session for the relay point of view
27 */
28 struct relay_session {
29 /*
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.
33 */
34 uint64_t id;
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 */
44 lttng_uuid sessiond_uuid;
45 /*
46 * Contains the creation time on the session daemon's end for 2.11+
47 * peers. Otherwise, this contains the session creation time on the
48 * relay daemon's end.
49 */
50 LTTNG_OPTIONAL(time_t) creation_time;
51 /* Must _not_ be empty for 2.4+ peers. */
52 char session_name[LTTNG_NAME_MAX];
53 char hostname[LTTNG_HOST_NAME_MAX];
54 char base_path[LTTNG_PATH_MAX];
55 /*
56 * Session output path relative to relayd's output path.
57 * Will be empty when interacting with peers < 2.11 since their
58 * streams' path are expressed relative to the relay daemon's
59 * output path.
60 */
61 char output_path[LTTNG_PATH_MAX];
62 uint32_t live_timer;
63
64 /* Session in snapshot mode. */
65 bool snapshot;
66
67 /*
68 * Session has no back reference to its connection because it
69 * has a life-time that can be longer than the consumer connection's
70 * life-time; a reference can still be held by the viewer
71 * connection through the viewer streams.
72 */
73
74 struct urcu_ref ref;
75
76 pthread_mutex_t lock;
77
78 /* major/minor version used for this session. */
79 uint32_t major;
80 uint32_t minor;
81
82 bool viewer_attached;
83 /* Tell if the session connection has been closed on the streaming side. */
84 bool connection_closed;
85
86 /*
87 * Tell if the session is currently living in a exiting relayd and
88 * should be cleaned forcefully without waiting for pending data or
89 * pending ctrl data.
90 */
91 bool aborted;
92
93 bool session_name_contains_creation_time;
94 /* Whether session has performed an explicit rotation. */
95 bool has_rotated;
96
97 /* Contains ctf_trace object of that session indexed by path name. */
98 struct lttng_ht *ctf_traces_ht;
99
100 /*
101 * This contains streams that are received on that connection.
102 * It's used to store them until we get the streams sent
103 * command. When this is received, we remove those streams from
104 * the list and publish them.
105 *
106 * Updates are protected by the recv_list_lock.
107 * Traversals are protected by RCU.
108 * recv_list_lock also protects stream_count.
109 */
110 struct cds_list_head recv_list; /* RCU list. */
111 uint32_t stream_count;
112 pthread_mutex_t recv_list_lock;
113
114 /*
115 * Flag checked and exchanged with uatomic_cmpxchg to tell the
116 * viewer-side if new streams got added since the last check.
117 */
118 unsigned long new_streams;
119
120 /*
121 * Node in the global session hash table.
122 */
123 struct lttng_ht_node_u64 session_n;
124 /*
125 * Member of the session list in struct relay_viewer_session.
126 * Updates are protected by the relay_viewer_session
127 * session_list_lock. Traversals are protected by RCU.
128 */
129 struct cds_list_head viewer_session_node;
130 struct lttng_trace_chunk *current_trace_chunk;
131 struct lttng_trace_chunk *pending_closure_trace_chunk;
132 /*
133 * Prevent live viewers from taking of copy of the chunk
134 * while new chunk has a temporary directory name.
135 */
136 bool ongoing_rotation;
137 struct lttng_directory_handle *output_directory;
138 struct rcu_head rcu_node; /* For call_rcu teardown. */
139 };
140
141 struct relay_session *session_create(const char *session_name,
142 const char *hostname, const char *base_path,
143 uint32_t live_timer,
144 bool snapshot,
145 const lttng_uuid sessiond_uuid,
146 const uint64_t *id_sessiond,
147 const uint64_t *current_chunk_id,
148 const time_t *creation_time,
149 uint32_t major,
150 uint32_t minor,
151 bool session_name_contains_creation_timestamp);
152 struct relay_session *session_get_by_id(uint64_t id);
153 bool session_get(struct relay_session *session);
154 void session_put(struct relay_session *session);
155
156 int session_close(struct relay_session *session);
157 int session_abort(struct relay_session *session);
158
159 void print_sessions(void);
160
161 #endif /* _SESSION_H */
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