Commit | Line | Data |
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2f8f53af DG |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
7591bab1 | 4 | * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
2f8f53af DG |
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 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
2f8f53af DG |
21 | #include <common/common.h> |
22 | #include <common/index/index.h> | |
f5436bfc | 23 | #include <common/compat/string.h> |
2f8f53af DG |
24 | |
25 | #include "lttng-relayd.h" | |
26 | #include "viewer-stream.h" | |
27 | ||
7591bab1 | 28 | static void viewer_stream_destroy(struct relay_viewer_stream *vstream) |
2f8f53af | 29 | { |
7591bab1 MD |
30 | free(vstream->path_name); |
31 | free(vstream->channel_name); | |
32 | free(vstream); | |
2f8f53af DG |
33 | } |
34 | ||
7591bab1 | 35 | static void viewer_stream_destroy_rcu(struct rcu_head *head) |
2f8f53af | 36 | { |
7591bab1 | 37 | struct relay_viewer_stream *vstream = |
2f8f53af DG |
38 | caa_container_of(head, struct relay_viewer_stream, rcu_node); |
39 | ||
7591bab1 | 40 | viewer_stream_destroy(vstream); |
2f8f53af DG |
41 | } |
42 | ||
43 | struct relay_viewer_stream *viewer_stream_create(struct relay_stream *stream, | |
7591bab1 | 44 | enum lttng_viewer_seek seek_t) |
2f8f53af DG |
45 | { |
46 | struct relay_viewer_stream *vstream; | |
47 | ||
2f8f53af DG |
48 | vstream = zmalloc(sizeof(*vstream)); |
49 | if (!vstream) { | |
50 | PERROR("relay viewer stream zmalloc"); | |
51 | goto error; | |
52 | } | |
53 | ||
f5436bfc | 54 | vstream->path_name = lttng_strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX); |
b272577e MD |
55 | if (vstream->path_name == NULL) { |
56 | PERROR("relay viewer path_name alloc"); | |
57 | goto error; | |
58 | } | |
f5436bfc | 59 | vstream->channel_name = lttng_strndup(stream->channel_name, |
2f8f53af | 60 | LTTNG_VIEWER_NAME_MAX); |
b272577e MD |
61 | if (vstream->channel_name == NULL) { |
62 | PERROR("relay viewer channel_name alloc"); | |
63 | goto error; | |
64 | } | |
2f8f53af | 65 | |
a44ca2ca MD |
66 | if (!stream_get(stream)) { |
67 | ERR("Cannot get stream"); | |
68 | goto error; | |
69 | } | |
70 | vstream->stream = stream; | |
71 | ||
72 | pthread_mutex_lock(&stream->lock); | |
73 | ||
74 | if (stream->is_metadata && stream->trace->viewer_metadata_stream) { | |
75 | ERR("Cannot attach viewer metadata stream to trace (busy)."); | |
76 | goto error_unlock; | |
77 | } | |
78 | ||
2f8f53af | 79 | switch (seek_t) { |
c4e361a4 | 80 | case LTTNG_VIEWER_SEEK_BEGINNING: |
a44ca2ca MD |
81 | { |
82 | uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa); | |
83 | ||
84 | if (seq_tail == -1ULL) { | |
85 | /* | |
86 | * Tail may not be initialized yet. Nonetheless, we know | |
87 | * we want to send the first index once it becomes | |
88 | * available. | |
89 | */ | |
90 | seq_tail = 0; | |
91 | } | |
92 | vstream->current_tracefile_id = | |
93 | tracefile_array_get_file_index_tail(stream->tfa); | |
94 | vstream->index_sent_seqcount = seq_tail; | |
2f8f53af | 95 | break; |
a44ca2ca | 96 | } |
c4e361a4 | 97 | case LTTNG_VIEWER_SEEK_LAST: |
a44ca2ca MD |
98 | vstream->current_tracefile_id = |
99 | tracefile_array_get_file_index_head(stream->tfa); | |
100 | /* | |
101 | * We seek at the very end of each stream, awaiting for | |
102 | * a future packet to eventually come in. | |
103 | * | |
104 | * We don't need to check the head position for -1ULL since the | |
105 | * increment will set it to 0. | |
106 | */ | |
107 | vstream->index_sent_seqcount = | |
108 | tracefile_array_get_seq_head(stream->tfa) + 1; | |
2f8f53af DG |
109 | break; |
110 | default: | |
a44ca2ca | 111 | goto error_unlock; |
2f8f53af | 112 | } |
2f8f53af | 113 | |
2f8f53af | 114 | /* |
a44ca2ca MD |
115 | * If we never received an index for the current stream, delay |
116 | * the opening of the index, otherwise open it right now. | |
2f8f53af | 117 | */ |
a44ca2ca | 118 | if (stream->index_received_seqcount == 0) { |
f8f3885c | 119 | vstream->index_file = NULL; |
2f8f53af | 120 | } else { |
f8f3885c MD |
121 | vstream->index_file = lttng_index_file_open(vstream->path_name, |
122 | vstream->channel_name, | |
7591bab1 MD |
123 | stream->tracefile_count, |
124 | vstream->current_tracefile_id); | |
f8f3885c | 125 | if (!vstream->index_file) { |
7591bab1 | 126 | goto error_unlock; |
2f8f53af | 127 | } |
2f8f53af DG |
128 | } |
129 | ||
f8f3885c | 130 | if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_file) { |
2f8f53af DG |
131 | off_t lseek_ret; |
132 | ||
f8f3885c | 133 | lseek_ret = lseek(vstream->index_file->fd, 0, SEEK_END); |
2f8f53af | 134 | if (lseek_ret < 0) { |
7591bab1 | 135 | goto error_unlock; |
2f8f53af | 136 | } |
7591bab1 | 137 | } |
7591bab1 MD |
138 | if (stream->is_metadata) { |
139 | rcu_assign_pointer(stream->trace->viewer_metadata_stream, | |
140 | vstream); | |
2f8f53af | 141 | } |
a44ca2ca | 142 | pthread_mutex_unlock(&stream->lock); |
2f8f53af | 143 | |
7591bab1 MD |
144 | /* Globally visible after the add unique. */ |
145 | lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle); | |
146 | lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n); | |
147 | ||
7591bab1 MD |
148 | urcu_ref_init(&vstream->ref); |
149 | ||
2f8f53af DG |
150 | return vstream; |
151 | ||
7591bab1 MD |
152 | error_unlock: |
153 | pthread_mutex_unlock(&stream->lock); | |
2f8f53af DG |
154 | error: |
155 | if (vstream) { | |
7591bab1 | 156 | viewer_stream_destroy(vstream); |
2f8f53af DG |
157 | } |
158 | return NULL; | |
159 | } | |
160 | ||
7591bab1 | 161 | static void viewer_stream_unpublish(struct relay_viewer_stream *vstream) |
2f8f53af DG |
162 | { |
163 | int ret; | |
164 | struct lttng_ht_iter iter; | |
165 | ||
7591bab1 | 166 | iter.iter.node = &vstream->stream_n.node; |
2f8f53af DG |
167 | ret = lttng_ht_del(viewer_streams_ht, &iter); |
168 | assert(!ret); | |
169 | } | |
170 | ||
7591bab1 | 171 | static void viewer_stream_release(struct urcu_ref *ref) |
2f8f53af | 172 | { |
7591bab1 MD |
173 | struct relay_viewer_stream *vstream = caa_container_of(ref, |
174 | struct relay_viewer_stream, ref); | |
2a174661 | 175 | |
7591bab1 MD |
176 | if (vstream->stream->is_metadata) { |
177 | rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL); | |
2a174661 | 178 | } |
2f8f53af | 179 | |
7591bab1 MD |
180 | viewer_stream_unpublish(vstream); |
181 | ||
182 | if (vstream->stream_fd) { | |
183 | stream_fd_put(vstream->stream_fd); | |
184 | vstream->stream_fd = NULL; | |
2f8f53af | 185 | } |
f8f3885c MD |
186 | if (vstream->index_file) { |
187 | lttng_index_file_put(vstream->index_file); | |
188 | vstream->index_file = NULL; | |
7591bab1 MD |
189 | } |
190 | if (vstream->stream) { | |
191 | stream_put(vstream->stream); | |
192 | vstream->stream = NULL; | |
193 | } | |
194 | call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu); | |
195 | } | |
196 | ||
197 | /* Must be called with RCU read-side lock held. */ | |
198 | bool viewer_stream_get(struct relay_viewer_stream *vstream) | |
199 | { | |
ce4d4083 | 200 | return urcu_ref_get_unless_zero(&vstream->ref); |
2f8f53af DG |
201 | } |
202 | ||
203 | /* | |
7591bab1 | 204 | * Get viewer stream by id. |
2f8f53af | 205 | * |
7591bab1 | 206 | * Return viewer stream if found else NULL. |
2f8f53af | 207 | */ |
7591bab1 | 208 | struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id) |
2f8f53af DG |
209 | { |
210 | struct lttng_ht_node_u64 *node; | |
211 | struct lttng_ht_iter iter; | |
7591bab1 | 212 | struct relay_viewer_stream *vstream = NULL; |
2f8f53af | 213 | |
7591bab1 | 214 | rcu_read_lock(); |
2f8f53af DG |
215 | lttng_ht_lookup(viewer_streams_ht, &id, &iter); |
216 | node = lttng_ht_iter_get_node_u64(&iter); | |
217 | if (!node) { | |
218 | DBG("Relay viewer stream %" PRIu64 " not found", id); | |
219 | goto end; | |
220 | } | |
7591bab1 MD |
221 | vstream = caa_container_of(node, struct relay_viewer_stream, stream_n); |
222 | if (!viewer_stream_get(vstream)) { | |
223 | vstream = NULL; | |
224 | } | |
2f8f53af | 225 | end: |
7591bab1 MD |
226 | rcu_read_unlock(); |
227 | return vstream; | |
228 | } | |
229 | ||
230 | void viewer_stream_put(struct relay_viewer_stream *vstream) | |
231 | { | |
232 | rcu_read_lock(); | |
7591bab1 | 233 | urcu_ref_put(&vstream->ref, viewer_stream_release); |
7591bab1 MD |
234 | rcu_read_unlock(); |
235 | } | |
236 | ||
2f8f53af DG |
237 | /* |
238 | * Rotate a stream to the next tracefile. | |
239 | * | |
7591bab1 | 240 | * Must be called with the rstream lock held. |
2f8f53af DG |
241 | * Returns 0 on success, 1 on EOF, a negative value on error. |
242 | */ | |
7591bab1 | 243 | int viewer_stream_rotate(struct relay_viewer_stream *vstream) |
2f8f53af DG |
244 | { |
245 | int ret; | |
7591bab1 | 246 | struct relay_stream *stream = vstream->stream; |
a44ca2ca | 247 | uint64_t new_id; |
2f8f53af | 248 | |
7591bab1 | 249 | /* Detect the last tracefile to open. */ |
a44ca2ca MD |
250 | if (stream->index_received_seqcount |
251 | == vstream->index_sent_seqcount | |
7591bab1 MD |
252 | && stream->trace->session->connection_closed) { |
253 | ret = 1; | |
2a174661 DG |
254 | goto end; |
255 | } | |
2f8f53af | 256 | |
7591bab1 MD |
257 | if (stream->tracefile_count == 0) { |
258 | /* Ignore rotation, there is none to do. */ | |
259 | ret = 0; | |
2f8f53af DG |
260 | goto end; |
261 | } | |
262 | ||
a44ca2ca MD |
263 | /* |
264 | * Try to move to the next file. | |
265 | */ | |
266 | new_id = (vstream->current_tracefile_id + 1) | |
267 | % stream->tracefile_count; | |
268 | if (tracefile_array_seq_in_file(stream->tfa, new_id, | |
269 | vstream->index_sent_seqcount)) { | |
270 | vstream->current_tracefile_id = new_id; | |
2f8f53af | 271 | } else { |
a44ca2ca MD |
272 | uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa); |
273 | ||
274 | /* | |
275 | * This can only be reached on overwrite, which implies there | |
276 | * has been data written at some point, which will have set the | |
277 | * tail. | |
278 | */ | |
279 | assert(seq_tail != -1ULL); | |
280 | /* | |
281 | * We need to resync because we lag behind tail. | |
282 | */ | |
7591bab1 | 283 | vstream->current_tracefile_id = |
a44ca2ca MD |
284 | tracefile_array_get_file_index_tail(stream->tfa); |
285 | vstream->index_sent_seqcount = seq_tail; | |
2f8f53af | 286 | } |
2f8f53af | 287 | |
f8f3885c MD |
288 | if (vstream->index_file) { |
289 | lttng_index_file_put(vstream->index_file); | |
290 | vstream->index_file = NULL; | |
2f8f53af | 291 | } |
7591bab1 MD |
292 | if (vstream->stream_fd) { |
293 | stream_fd_put(vstream->stream_fd); | |
294 | vstream->stream_fd = NULL; | |
2f8f53af | 295 | } |
2f8f53af | 296 | |
f8f3885c MD |
297 | vstream->index_file = lttng_index_file_open(vstream->path_name, |
298 | vstream->channel_name, | |
7591bab1 MD |
299 | stream->tracefile_count, |
300 | vstream->current_tracefile_id); | |
f8f3885c MD |
301 | if (!vstream->index_file) { |
302 | ret = -1; | |
7591bab1 | 303 | goto end; |
7591bab1 | 304 | } else { |
f8f3885c | 305 | ret = 0; |
2f8f53af | 306 | } |
2f8f53af | 307 | end: |
2f8f53af DG |
308 | return ret; |
309 | } | |
7591bab1 MD |
310 | |
311 | void print_viewer_streams(void) | |
312 | { | |
313 | struct lttng_ht_iter iter; | |
314 | struct relay_viewer_stream *vstream; | |
315 | ||
ce3f3ba3 JG |
316 | if (!viewer_streams_ht) { |
317 | return; | |
318 | } | |
319 | ||
7591bab1 MD |
320 | rcu_read_lock(); |
321 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
322 | stream_n.node) { | |
323 | if (!viewer_stream_get(vstream)) { | |
324 | continue; | |
325 | } | |
326 | DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64 | |
327 | " session %" PRIu64, | |
328 | vstream, | |
329 | vstream->ref.refcount, | |
330 | vstream->stream->stream_handle, | |
331 | vstream->stream->trace->id, | |
332 | vstream->stream->trace->session->id); | |
333 | viewer_stream_put(vstream); | |
334 | } | |
335 | rcu_read_unlock(); | |
336 | } |