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 MD |
10 | #define _LGPL_SOURCE |
11 | #include <common/common.h> | |
12 | #include <urcu/rculist.h> | |
13 | ||
14 | #include "lttng-relayd.h" | |
15 | #include "ctf-trace.h" | |
16 | #include "session.h" | |
17 | #include "viewer-session.h" | |
18 | #include "viewer-stream.h" | |
19 | #include "stream.h" | |
20 | ||
21 | struct relay_viewer_session *viewer_session_create(void) | |
22 | { | |
23 | struct relay_viewer_session *vsession; | |
24 | ||
25 | vsession = zmalloc(sizeof(*vsession)); | |
26 | if (!vsession) { | |
27 | goto end; | |
28 | } | |
29 | CDS_INIT_LIST_HEAD(&vsession->session_list); | |
30 | end: | |
31 | return vsession; | |
32 | } | |
33 | ||
b3ab5004 | 34 | int viewer_session_set_trace_chunk_copy(struct relay_viewer_session *vsession, |
664eef54 JG |
35 | struct lttng_trace_chunk *relay_session_trace_chunk) |
36 | { | |
37 | int ret = 0; | |
38 | struct lttng_trace_chunk *viewer_chunk; | |
39 | ||
40 | assert(relay_session_trace_chunk); | |
de755d0b 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"); | |
45 | viewer_chunk = lttng_trace_chunk_copy(relay_session_trace_chunk); | |
46 | if (!viewer_chunk) { | |
47 | ERR("Failed to create a viewer trace chunk from the relay session's current chunk"); | |
48 | ret = -1; | |
49 | goto end; | |
50 | } | |
51 | ||
52 | vsession->current_trace_chunk = viewer_chunk; | |
53 | end: | |
54 | return ret; | |
55 | } | |
56 | ||
7591bab1 | 57 | /* The existence of session must be guaranteed by the caller. */ |
dbd6665b JG |
58 | enum lttng_viewer_attach_return_code viewer_session_attach( |
59 | struct relay_viewer_session *vsession, | |
7591bab1 MD |
60 | struct relay_session *session) |
61 | { | |
dbd6665b JG |
62 | enum lttng_viewer_attach_return_code viewer_attach_status = |
63 | LTTNG_VIEWER_ATTACH_OK; | |
7591bab1 | 64 | |
c06fdd95 JG |
65 | ASSERT_LOCKED(session->lock); |
66 | ||
7591bab1 MD |
67 | /* Will not fail, as per the ownership guarantee. */ |
68 | if (!session_get(session)) { | |
dbd6665b | 69 | viewer_attach_status = LTTNG_VIEWER_ATTACH_UNK; |
7591bab1 MD |
70 | goto end; |
71 | } | |
7591bab1 | 72 | if (session->viewer_attached) { |
dbd6665b | 73 | viewer_attach_status = LTTNG_VIEWER_ATTACH_ALREADY; |
7591bab1 | 74 | } else { |
dbd6665b JG |
75 | int ret; |
76 | ||
77 | assert(session->current_trace_chunk); | |
78 | assert(!vsession->current_trace_chunk); | |
7591bab1 | 79 | session->viewer_attached = true; |
dbd6665b | 80 | |
664eef54 | 81 | ret = viewer_session_set_trace_chunk_copy(vsession, |
dbd6665b JG |
82 | session->current_trace_chunk); |
83 | if (ret) { | |
84 | /* | |
85 | * The live protocol does not define a generic error | |
86 | * value for the "attach" command. The "unknown" | |
87 | * status is used so that the viewer may handle this | |
88 | * failure as if the session didn't exist anymore. | |
89 | */ | |
90 | DBG("Failed to create a viewer trace chunk from the current trace chunk of session \"%s\", returning LTTNG_VIEWER_ATTACH_UNK", | |
91 | session->session_name); | |
92 | viewer_attach_status = LTTNG_VIEWER_ATTACH_UNK; | |
93 | } | |
7591bab1 MD |
94 | } |
95 | ||
dbd6665b | 96 | if (viewer_attach_status == LTTNG_VIEWER_ATTACH_OK) { |
7591bab1 MD |
97 | pthread_mutex_lock(&vsession->session_list_lock); |
98 | /* Ownership is transfered to the list. */ | |
99 | cds_list_add_rcu(&session->viewer_session_node, | |
100 | &vsession->session_list); | |
101 | pthread_mutex_unlock(&vsession->session_list_lock); | |
102 | } else { | |
103 | /* Put our local ref. */ | |
104 | session_put(session); | |
105 | } | |
7591bab1 | 106 | end: |
dbd6665b | 107 | return viewer_attach_status; |
7591bab1 MD |
108 | } |
109 | ||
110 | /* The existence of session must be guaranteed by the caller. */ | |
111 | static int viewer_session_detach(struct relay_viewer_session *vsession, | |
112 | struct relay_session *session) | |
113 | { | |
114 | int ret = 0; | |
115 | ||
116 | pthread_mutex_lock(&session->lock); | |
117 | if (!session->viewer_attached) { | |
118 | ret = -1; | |
119 | } else { | |
120 | session->viewer_attached = false; | |
121 | } | |
122 | ||
123 | if (!ret) { | |
124 | pthread_mutex_lock(&vsession->session_list_lock); | |
125 | cds_list_del_rcu(&session->viewer_session_node); | |
126 | pthread_mutex_unlock(&vsession->session_list_lock); | |
127 | /* Release reference held by the list. */ | |
128 | session_put(session); | |
129 | } | |
130 | /* Safe since we know the session exists. */ | |
131 | pthread_mutex_unlock(&session->lock); | |
132 | return ret; | |
133 | } | |
134 | ||
135 | void viewer_session_destroy(struct relay_viewer_session *vsession) | |
136 | { | |
b66a15d1 | 137 | lttng_trace_chunk_put(vsession->current_trace_chunk); |
7591bab1 MD |
138 | free(vsession); |
139 | } | |
140 | ||
d62023be JD |
141 | /* |
142 | * Release ownership of all the streams of one session and detach the viewer. | |
143 | */ | |
144 | void viewer_session_close_one_session(struct relay_viewer_session *vsession, | |
145 | struct relay_session *session) | |
146 | { | |
147 | struct lttng_ht_iter iter; | |
148 | struct relay_viewer_stream *vstream; | |
149 | ||
150 | /* | |
151 | * TODO: improvement: create more efficient list of | |
152 | * vstream per session. | |
153 | */ | |
154 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, | |
155 | vstream, stream_n.node) { | |
156 | if (!viewer_stream_get(vstream)) { | |
157 | continue; | |
158 | } | |
159 | if (vstream->stream->trace->session != session) { | |
160 | viewer_stream_put(vstream); | |
161 | continue; | |
162 | } | |
163 | /* Put local reference. */ | |
164 | viewer_stream_put(vstream); | |
165 | /* | |
166 | * We have reached one of the viewer stream's lifetime | |
167 | * end condition. This "put" will cause the proper | |
168 | * teardown of the viewer stream. | |
169 | */ | |
170 | viewer_stream_put(vstream); | |
171 | } | |
b3feb91b JG |
172 | lttng_trace_chunk_put(vsession->current_trace_chunk); |
173 | vsession->current_trace_chunk = NULL; | |
d62023be JD |
174 | viewer_session_detach(vsession, session); |
175 | } | |
176 | ||
7591bab1 MD |
177 | void viewer_session_close(struct relay_viewer_session *vsession) |
178 | { | |
179 | struct relay_session *session; | |
180 | ||
181 | rcu_read_lock(); | |
182 | cds_list_for_each_entry_rcu(session, | |
183 | &vsession->session_list, viewer_session_node) { | |
d62023be | 184 | viewer_session_close_one_session(vsession, session); |
7591bab1 MD |
185 | } |
186 | rcu_read_unlock(); | |
187 | } | |
188 | ||
189 | /* | |
190 | * Check if a connection is attached to a session. | |
191 | * Return 1 if attached, 0 if not attached, a negative value on error. | |
192 | */ | |
193 | int viewer_session_is_attached(struct relay_viewer_session *vsession, | |
194 | struct relay_session *session) | |
195 | { | |
196 | struct relay_session *iter; | |
197 | int found = 0; | |
198 | ||
199 | pthread_mutex_lock(&session->lock); | |
200 | if (!vsession) { | |
201 | goto end; | |
202 | } | |
203 | if (!session->viewer_attached) { | |
204 | goto end; | |
205 | } | |
206 | rcu_read_lock(); | |
207 | cds_list_for_each_entry_rcu(iter, | |
208 | &vsession->session_list, | |
209 | viewer_session_node) { | |
210 | if (session == iter) { | |
211 | found = 1; | |
212 | goto end_rcu_unlock; | |
213 | } | |
214 | } | |
215 | end_rcu_unlock: | |
216 | rcu_read_unlock(); | |
217 | end: | |
218 | pthread_mutex_unlock(&session->lock); | |
219 | return found; | |
220 | } |