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7591bab1 MD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
4 | * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License, version 2 only, as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
17 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
7591bab1 MD |
20 | #define _LGPL_SOURCE |
21 | #include <common/common.h> | |
22 | #include <urcu/rculist.h> | |
23 | ||
24 | #include "lttng-relayd.h" | |
25 | #include "ctf-trace.h" | |
26 | #include "session.h" | |
27 | #include "viewer-session.h" | |
28 | #include "viewer-stream.h" | |
29 | #include "stream.h" | |
30 | ||
31 | struct relay_viewer_session *viewer_session_create(void) | |
32 | { | |
33 | struct relay_viewer_session *vsession; | |
34 | ||
35 | vsession = zmalloc(sizeof(*vsession)); | |
36 | if (!vsession) { | |
37 | goto end; | |
38 | } | |
39 | CDS_INIT_LIST_HEAD(&vsession->session_list); | |
40 | end: | |
41 | return vsession; | |
42 | } | |
43 | ||
44 | /* The existence of session must be guaranteed by the caller. */ | |
52c91a6e JG |
45 | enum lttng_viewer_attach_return_code viewer_session_attach( |
46 | struct relay_viewer_session *vsession, | |
7591bab1 MD |
47 | struct relay_session *session) |
48 | { | |
52c91a6e JG |
49 | enum lttng_viewer_attach_return_code viewer_attach_status = |
50 | LTTNG_VIEWER_ATTACH_OK; | |
7591bab1 | 51 | |
9a51883c JG |
52 | ASSERT_LOCKED(session->lock); |
53 | ||
7591bab1 MD |
54 | /* Will not fail, as per the ownership guarantee. */ |
55 | if (!session_get(session)) { | |
52c91a6e | 56 | viewer_attach_status = LTTNG_VIEWER_ATTACH_UNK; |
7591bab1 MD |
57 | goto end; |
58 | } | |
7591bab1 | 59 | if (session->viewer_attached) { |
52c91a6e | 60 | viewer_attach_status = LTTNG_VIEWER_ATTACH_ALREADY; |
7591bab1 | 61 | } else { |
52c91a6e JG |
62 | int ret; |
63 | ||
64 | assert(session->current_trace_chunk); | |
65 | assert(!vsession->current_trace_chunk); | |
7591bab1 | 66 | session->viewer_attached = true; |
52c91a6e JG |
67 | |
68 | ret = viewer_session_set_trace_chunk(vsession, | |
69 | session->current_trace_chunk); | |
70 | if (ret) { | |
71 | /* | |
72 | * The live protocol does not define a generic error | |
73 | * value for the "attach" command. The "unknown" | |
74 | * status is used so that the viewer may handle this | |
75 | * failure as if the session didn't exist anymore. | |
76 | */ | |
77 | DBG("Failed to create a viewer trace chunk from the current trace chunk of session \"%s\", returning LTTNG_VIEWER_ATTACH_UNK", | |
78 | session->session_name); | |
79 | viewer_attach_status = LTTNG_VIEWER_ATTACH_UNK; | |
80 | } | |
7591bab1 MD |
81 | } |
82 | ||
52c91a6e | 83 | if (viewer_attach_status == LTTNG_VIEWER_ATTACH_OK) { |
7591bab1 MD |
84 | pthread_mutex_lock(&vsession->session_list_lock); |
85 | /* Ownership is transfered to the list. */ | |
86 | cds_list_add_rcu(&session->viewer_session_node, | |
87 | &vsession->session_list); | |
88 | pthread_mutex_unlock(&vsession->session_list_lock); | |
89 | } else { | |
90 | /* Put our local ref. */ | |
91 | session_put(session); | |
92 | } | |
7591bab1 | 93 | end: |
52c91a6e | 94 | return viewer_attach_status; |
7591bab1 MD |
95 | } |
96 | ||
97 | /* The existence of session must be guaranteed by the caller. */ | |
98 | static int viewer_session_detach(struct relay_viewer_session *vsession, | |
99 | struct relay_session *session) | |
100 | { | |
101 | int ret = 0; | |
102 | ||
103 | pthread_mutex_lock(&session->lock); | |
104 | if (!session->viewer_attached) { | |
105 | ret = -1; | |
106 | } else { | |
107 | session->viewer_attached = false; | |
108 | } | |
109 | ||
110 | if (!ret) { | |
111 | pthread_mutex_lock(&vsession->session_list_lock); | |
112 | cds_list_del_rcu(&session->viewer_session_node); | |
113 | pthread_mutex_unlock(&vsession->session_list_lock); | |
114 | /* Release reference held by the list. */ | |
115 | session_put(session); | |
116 | } | |
117 | /* Safe since we know the session exists. */ | |
118 | pthread_mutex_unlock(&session->lock); | |
119 | return ret; | |
120 | } | |
121 | ||
122 | void viewer_session_destroy(struct relay_viewer_session *vsession) | |
123 | { | |
279cc4fe | 124 | lttng_trace_chunk_put(vsession->current_trace_chunk); |
7591bab1 MD |
125 | free(vsession); |
126 | } | |
127 | ||
d62023be JD |
128 | /* |
129 | * Release ownership of all the streams of one session and detach the viewer. | |
130 | */ | |
131 | void viewer_session_close_one_session(struct relay_viewer_session *vsession, | |
132 | struct relay_session *session) | |
133 | { | |
134 | struct lttng_ht_iter iter; | |
135 | struct relay_viewer_stream *vstream; | |
136 | ||
137 | /* | |
138 | * TODO: improvement: create more efficient list of | |
139 | * vstream per session. | |
140 | */ | |
141 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, | |
142 | vstream, stream_n.node) { | |
143 | if (!viewer_stream_get(vstream)) { | |
144 | continue; | |
145 | } | |
146 | if (vstream->stream->trace->session != session) { | |
147 | viewer_stream_put(vstream); | |
148 | continue; | |
149 | } | |
150 | /* Put local reference. */ | |
151 | viewer_stream_put(vstream); | |
152 | /* | |
153 | * We have reached one of the viewer stream's lifetime | |
154 | * end condition. This "put" will cause the proper | |
155 | * teardown of the viewer stream. | |
156 | */ | |
157 | viewer_stream_put(vstream); | |
158 | } | |
159 | ||
160 | viewer_session_detach(vsession, session); | |
161 | } | |
162 | ||
7591bab1 MD |
163 | void viewer_session_close(struct relay_viewer_session *vsession) |
164 | { | |
165 | struct relay_session *session; | |
166 | ||
167 | rcu_read_lock(); | |
168 | cds_list_for_each_entry_rcu(session, | |
169 | &vsession->session_list, viewer_session_node) { | |
d62023be | 170 | viewer_session_close_one_session(vsession, session); |
7591bab1 MD |
171 | } |
172 | rcu_read_unlock(); | |
173 | } | |
174 | ||
175 | /* | |
176 | * Check if a connection is attached to a session. | |
177 | * Return 1 if attached, 0 if not attached, a negative value on error. | |
178 | */ | |
179 | int viewer_session_is_attached(struct relay_viewer_session *vsession, | |
180 | struct relay_session *session) | |
181 | { | |
182 | struct relay_session *iter; | |
183 | int found = 0; | |
184 | ||
185 | pthread_mutex_lock(&session->lock); | |
186 | if (!vsession) { | |
187 | goto end; | |
188 | } | |
189 | if (!session->viewer_attached) { | |
190 | goto end; | |
191 | } | |
192 | rcu_read_lock(); | |
193 | cds_list_for_each_entry_rcu(iter, | |
194 | &vsession->session_list, | |
195 | viewer_session_node) { | |
196 | if (session == iter) { | |
197 | found = 1; | |
198 | goto end_rcu_unlock; | |
199 | } | |
200 | } | |
201 | end_rcu_unlock: | |
202 | rcu_read_unlock(); | |
203 | end: | |
204 | pthread_mutex_unlock(&session->lock); | |
205 | return found; | |
206 | } | |
279cc4fe JG |
207 | |
208 | int viewer_session_set_trace_chunk(struct relay_viewer_session *vsession, | |
209 | struct lttng_trace_chunk *relay_session_trace_chunk) | |
210 | { | |
211 | int ret = 0; | |
212 | struct lttng_trace_chunk *viewer_chunk; | |
213 | ||
214 | assert(relay_session_trace_chunk); | |
215 | assert(!vsession->current_trace_chunk); | |
216 | ||
217 | DBG("Copying relay session's current trace chunk to the viewer session"); | |
218 | viewer_chunk = lttng_trace_chunk_copy(relay_session_trace_chunk); | |
219 | if (!viewer_chunk) { | |
220 | ERR("Failed to create a viewer trace chunk from the relay session's current chunk"); | |
221 | ret = -1; | |
222 | goto end; | |
223 | } | |
224 | ||
225 | vsession->current_trace_chunk = viewer_chunk; | |
226 | end: | |
227 | return ret; | |
228 | } |