Commit | Line | Data |
---|---|---|
7591bab1 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com> |
3 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> | |
4 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7591bab1 | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
7591bab1 | 7 | * |
7591bab1 MD |
8 | */ |
9 | ||
7591bab1 | 10 | #define _LGPL_SOURCE |
c9e313bc | 11 | #include "ctf-trace.hpp" |
28ab034a | 12 | #include "lttng-relayd.hpp" |
c9e313bc | 13 | #include "session.hpp" |
28ab034a | 14 | #include "stream.hpp" |
c9e313bc SM |
15 | #include "viewer-session.hpp" |
16 | #include "viewer-stream.hpp" | |
28ab034a JG |
17 | |
18 | #include <common/common.hpp> | |
19 | ||
20 | #include <urcu/rculist.h> | |
7591bab1 MD |
21 | |
22 | struct relay_viewer_session *viewer_session_create(void) | |
23 | { | |
24 | struct relay_viewer_session *vsession; | |
25 | ||
64803277 | 26 | vsession = zmalloc<relay_viewer_session>(); |
7591bab1 MD |
27 | if (!vsession) { |
28 | goto end; | |
29 | } | |
30 | CDS_INIT_LIST_HEAD(&vsession->session_list); | |
31 | end: | |
32 | return vsession; | |
33 | } | |
34 | ||
b3ab5004 | 35 | int viewer_session_set_trace_chunk_copy(struct relay_viewer_session *vsession, |
28ab034a | 36 | struct lttng_trace_chunk *relay_session_trace_chunk) |
664eef54 JG |
37 | { |
38 | int ret = 0; | |
39 | struct lttng_trace_chunk *viewer_chunk; | |
40 | ||
ad8bec24 JG |
41 | lttng_trace_chunk_put(vsession->current_trace_chunk); |
42 | vsession->current_trace_chunk = NULL; | |
664eef54 JG |
43 | |
44 | DBG("Copying relay session's current trace chunk to the viewer session"); | |
80516611 JG |
45 | if (!relay_session_trace_chunk) { |
46 | goto end; | |
47 | } | |
48 | ||
664eef54 JG |
49 | viewer_chunk = lttng_trace_chunk_copy(relay_session_trace_chunk); |
50 | if (!viewer_chunk) { | |
51 | ERR("Failed to create a viewer trace chunk from the relay session's current chunk"); | |
52 | ret = -1; | |
53 | goto end; | |
54 | } | |
55 | ||
56 | vsession->current_trace_chunk = viewer_chunk; | |
57 | end: | |
58 | return ret; | |
59 | } | |
60 | ||
7591bab1 | 61 | /* The existence of session must be guaranteed by the caller. */ |
28ab034a JG |
62 | enum lttng_viewer_attach_return_code viewer_session_attach(struct relay_viewer_session *vsession, |
63 | struct relay_session *session) | |
7591bab1 | 64 | { |
28ab034a | 65 | enum lttng_viewer_attach_return_code viewer_attach_status = LTTNG_VIEWER_ATTACH_OK; |
7591bab1 | 66 | |
c06fdd95 JG |
67 | ASSERT_LOCKED(session->lock); |
68 | ||
7591bab1 MD |
69 | /* Will not fail, as per the ownership guarantee. */ |
70 | if (!session_get(session)) { | |
dbd6665b | 71 | viewer_attach_status = LTTNG_VIEWER_ATTACH_UNK; |
7591bab1 MD |
72 | goto end; |
73 | } | |
7591bab1 | 74 | if (session->viewer_attached) { |
dbd6665b | 75 | viewer_attach_status = LTTNG_VIEWER_ATTACH_ALREADY; |
7591bab1 | 76 | } else { |
dbd6665b JG |
77 | int ret; |
78 | ||
7591bab1 | 79 | session->viewer_attached = true; |
dbd6665b | 80 | |
28ab034a | 81 | ret = viewer_session_set_trace_chunk_copy(vsession, session->current_trace_chunk); |
dbd6665b JG |
82 | if (ret) { |
83 | /* | |
84 | * The live protocol does not define a generic error | |
85 | * value for the "attach" command. The "unknown" | |
86 | * status is used so that the viewer may handle this | |
87 | * failure as if the session didn't exist anymore. | |
88 | */ | |
89 | DBG("Failed to create a viewer trace chunk from the current trace chunk of session \"%s\", returning LTTNG_VIEWER_ATTACH_UNK", | |
28ab034a | 90 | session->session_name); |
dbd6665b JG |
91 | viewer_attach_status = LTTNG_VIEWER_ATTACH_UNK; |
92 | } | |
7591bab1 MD |
93 | } |
94 | ||
dbd6665b | 95 | if (viewer_attach_status == LTTNG_VIEWER_ATTACH_OK) { |
7591bab1 MD |
96 | pthread_mutex_lock(&vsession->session_list_lock); |
97 | /* Ownership is transfered to the list. */ | |
28ab034a | 98 | cds_list_add_rcu(&session->viewer_session_node, &vsession->session_list); |
7591bab1 MD |
99 | pthread_mutex_unlock(&vsession->session_list_lock); |
100 | } else { | |
101 | /* Put our local ref. */ | |
102 | session_put(session); | |
103 | } | |
7591bab1 | 104 | end: |
dbd6665b | 105 | return viewer_attach_status; |
7591bab1 MD |
106 | } |
107 | ||
108 | /* The existence of session must be guaranteed by the caller. */ | |
109 | static int viewer_session_detach(struct relay_viewer_session *vsession, | |
28ab034a | 110 | struct relay_session *session) |
7591bab1 MD |
111 | { |
112 | int ret = 0; | |
113 | ||
114 | pthread_mutex_lock(&session->lock); | |
115 | if (!session->viewer_attached) { | |
116 | ret = -1; | |
117 | } else { | |
118 | session->viewer_attached = false; | |
119 | } | |
120 | ||
121 | if (!ret) { | |
122 | pthread_mutex_lock(&vsession->session_list_lock); | |
123 | cds_list_del_rcu(&session->viewer_session_node); | |
124 | pthread_mutex_unlock(&vsession->session_list_lock); | |
125 | /* Release reference held by the list. */ | |
126 | session_put(session); | |
127 | } | |
128 | /* Safe since we know the session exists. */ | |
129 | pthread_mutex_unlock(&session->lock); | |
130 | return ret; | |
131 | } | |
132 | ||
133 | void viewer_session_destroy(struct relay_viewer_session *vsession) | |
134 | { | |
b66a15d1 | 135 | lttng_trace_chunk_put(vsession->current_trace_chunk); |
7591bab1 MD |
136 | free(vsession); |
137 | } | |
138 | ||
d62023be JD |
139 | /* |
140 | * Release ownership of all the streams of one session and detach the viewer. | |
141 | */ | |
142 | void viewer_session_close_one_session(struct relay_viewer_session *vsession, | |
28ab034a | 143 | struct relay_session *session) |
d62023be JD |
144 | { |
145 | struct lttng_ht_iter iter; | |
146 | struct relay_viewer_stream *vstream; | |
147 | ||
148 | /* | |
149 | * TODO: improvement: create more efficient list of | |
150 | * vstream per session. | |
151 | */ | |
28ab034a | 152 | cds_lfht_for_each_entry (viewer_streams_ht->ht, &iter.iter, vstream, stream_n.node) { |
d62023be JD |
153 | if (!viewer_stream_get(vstream)) { |
154 | continue; | |
155 | } | |
156 | if (vstream->stream->trace->session != session) { | |
157 | viewer_stream_put(vstream); | |
158 | continue; | |
159 | } | |
160 | /* Put local reference. */ | |
161 | viewer_stream_put(vstream); | |
162 | /* | |
163 | * We have reached one of the viewer stream's lifetime | |
164 | * end condition. This "put" will cause the proper | |
165 | * teardown of the viewer stream. | |
166 | */ | |
167 | viewer_stream_put(vstream); | |
168 | } | |
b3feb91b JG |
169 | lttng_trace_chunk_put(vsession->current_trace_chunk); |
170 | vsession->current_trace_chunk = NULL; | |
d62023be JD |
171 | viewer_session_detach(vsession, session); |
172 | } | |
173 | ||
7591bab1 MD |
174 | void viewer_session_close(struct relay_viewer_session *vsession) |
175 | { | |
176 | struct relay_session *session; | |
177 | ||
178 | rcu_read_lock(); | |
28ab034a JG |
179 | cds_list_for_each_entry_rcu(session, &vsession->session_list, viewer_session_node) |
180 | { | |
d62023be | 181 | viewer_session_close_one_session(vsession, session); |
7591bab1 MD |
182 | } |
183 | rcu_read_unlock(); | |
184 | } | |
185 | ||
186 | /* | |
187 | * Check if a connection is attached to a session. | |
188 | * Return 1 if attached, 0 if not attached, a negative value on error. | |
189 | */ | |
28ab034a | 190 | int viewer_session_is_attached(struct relay_viewer_session *vsession, struct relay_session *session) |
7591bab1 MD |
191 | { |
192 | struct relay_session *iter; | |
193 | int found = 0; | |
194 | ||
195 | pthread_mutex_lock(&session->lock); | |
196 | if (!vsession) { | |
197 | goto end; | |
198 | } | |
199 | if (!session->viewer_attached) { | |
200 | goto end; | |
201 | } | |
202 | rcu_read_lock(); | |
28ab034a JG |
203 | cds_list_for_each_entry_rcu(iter, &vsession->session_list, viewer_session_node) |
204 | { | |
7591bab1 MD |
205 | if (session == iter) { |
206 | found = 1; | |
207 | goto end_rcu_unlock; | |
208 | } | |
209 | } | |
210 | end_rcu_unlock: | |
211 | rcu_read_unlock(); | |
212 | end: | |
213 | pthread_mutex_unlock(&session->lock); | |
214 | return found; | |
215 | } |