Fix: evaluate trigger condition on registration
[lttng-tools.git] / src / bin / lttng-relayd / connection.h
1 #ifndef _CONNECTION_H
2 #define _CONNECTION_H
3
4 /*
5 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
6 * David Goulet <dgoulet@efficios.com>
7 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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
23 #include <limits.h>
24 #include <inttypes.h>
25 #include <pthread.h>
26 #include <urcu.h>
27 #include <urcu/wfcqueue.h>
28 #include <urcu/list.h>
29
30 #include <common/hashtable/hashtable.h>
31 #include <common/sessiond-comm/sessiond-comm.h>
32
33 #include "session.h"
34
35 enum connection_type {
36 RELAY_CONNECTION_UNKNOWN = 0,
37 RELAY_DATA = 1,
38 RELAY_CONTROL = 2,
39 RELAY_VIEWER_COMMAND = 3,
40 RELAY_VIEWER_NOTIFICATION = 4,
41 };
42
43 /*
44 * Internal structure to map a socket with the corresponding session.
45 * A hashtable indexed on the socket FD is used for the lookups.
46 *
47 * Connections are assumed to be accessed from a single thread. Live
48 * connections between the relay and a live client are only accessed
49 * from the live worker thread.
50 *
51 * The connections between the consumerd/sessiond and the relayd are only
52 * handled by the "main" worker thread (as in, the worker thread in main.c).
53 *
54 * This is why there are no back references to connections from the
55 * sessions and session list.
56 */
57 struct relay_connection {
58 struct lttcomm_sock *sock;
59 struct cds_wfcq_node qnode;
60
61 enum connection_type type;
62 /*
63 * session is only ever set for RELAY_CONTROL connection type.
64 */
65 struct relay_session *session;
66 /*
67 * viewer_session is only ever set for RELAY_VIEWER_COMMAND
68 * connection type.
69 */
70 struct relay_viewer_session *viewer_session;
71
72 /*
73 * Protocol version to use for this connection. Only valid for
74 * RELAY_CONTROL connection type.
75 */
76 uint32_t major;
77 uint32_t minor;
78
79 struct urcu_ref ref;
80
81 bool version_check_done;
82
83 /*
84 * Node member of connection within global socket hash table.
85 */
86 struct lttng_ht_node_ulong sock_n;
87 bool in_socket_ht;
88 struct lttng_ht *socket_ht; /* HACK: Contained within this hash table. */
89 struct rcu_head rcu_node; /* For call_rcu teardown. */
90 };
91
92 struct relay_connection *connection_create(struct lttcomm_sock *sock,
93 enum connection_type type);
94 struct relay_connection *connection_get_by_sock(struct lttng_ht *relay_connections_ht,
95 int sock);
96 bool connection_get(struct relay_connection *connection);
97 void connection_put(struct relay_connection *connection);
98 void connection_ht_add(struct lttng_ht *relay_connections_ht,
99 struct relay_connection *conn);
100
101 #endif /* _CONNECTION_H */
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