Fix: big relayd cleanup and refactor
[lttng-tools.git] / src / bin / lttng-relayd / lttng-relayd.h
1 /*
2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #ifndef LTTNG_RELAYD_H
20 #define LTTNG_RELAYD_H
21
22 #define _LGPL_SOURCE
23 #include <limits.h>
24 #include <urcu.h>
25 #include <urcu/wfqueue.h>
26 #include <urcu/list.h>
27
28 #include <common/hashtable/hashtable.h>
29 #include <common/index/ctf-index.h>
30
31 #include "ctf-trace.h"
32 #include "session.h"
33
34 /*
35 * Queue used to enqueue relay requests
36 */
37 struct relay_cmd_queue {
38 struct cds_wfq_queue queue;
39 int32_t futex;
40 };
41
42 enum connection_type {
43 RELAY_DATA = 1,
44 RELAY_CONTROL = 2,
45 RELAY_VIEWER_COMMAND = 3,
46 RELAY_VIEWER_NOTIFICATION = 4,
47 };
48
49 /*
50 * Internal structure to map a socket with the corresponding session.
51 * A hashtable indexed on the socket FD is used for the lookups.
52 */
53 struct relay_command {
54 struct lttcomm_sock *sock;
55 struct relay_session *session;
56 struct cds_wfq_node node;
57 struct lttng_ht_node_ulong sock_n;
58 struct rcu_head rcu_node;
59 enum connection_type type;
60 /* protocol version to use for this session */
61 uint32_t major;
62 uint32_t minor;
63 uint64_t session_id;
64 struct cds_list_head recv_head;
65 unsigned int version_check_done:1;
66 };
67
68 struct relay_local_data {
69 struct lttng_ht *sessions_ht;
70 };
71
72 extern char *opt_output_path;
73
74 /*
75 * Contains stream indexed by ID. This is important since many commands lookup
76 * streams only by ID thus also keeping them in this hash table makes the
77 * search O(1) instead of iterating over the ctf_traces_ht of the session.
78 */
79 extern struct lttng_ht *relay_streams_ht;
80
81 extern struct lttng_ht *viewer_streams_ht;
82 extern struct lttng_ht *indexes_ht;
83
84 extern const char *tracing_group_name;
85
86 extern const char * const config_section_name;
87
88 void lttng_relay_notify_ready(void);
89
90 #endif /* LTTNG_RELAYD_H */
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