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 | ||
20 | #define _GNU_SOURCE | |
6c1c0768 | 21 | #define _LGPL_SOURCE |
2f8f53af DG |
22 | #include <common/common.h> |
23 | #include <common/index/index.h> | |
f5436bfc | 24 | #include <common/compat/string.h> |
2f8f53af DG |
25 | |
26 | #include "lttng-relayd.h" | |
27 | #include "viewer-stream.h" | |
28 | ||
7591bab1 | 29 | static void viewer_stream_destroy(struct relay_viewer_stream *vstream) |
2f8f53af | 30 | { |
7591bab1 MD |
31 | free(vstream->path_name); |
32 | free(vstream->channel_name); | |
33 | free(vstream); | |
2f8f53af DG |
34 | } |
35 | ||
7591bab1 | 36 | static void viewer_stream_destroy_rcu(struct rcu_head *head) |
2f8f53af | 37 | { |
7591bab1 | 38 | struct relay_viewer_stream *vstream = |
2f8f53af DG |
39 | caa_container_of(head, struct relay_viewer_stream, rcu_node); |
40 | ||
7591bab1 | 41 | viewer_stream_destroy(vstream); |
2f8f53af DG |
42 | } |
43 | ||
44 | struct relay_viewer_stream *viewer_stream_create(struct relay_stream *stream, | |
7591bab1 | 45 | enum lttng_viewer_seek seek_t) |
2f8f53af DG |
46 | { |
47 | struct relay_viewer_stream *vstream; | |
48 | ||
2f8f53af DG |
49 | vstream = zmalloc(sizeof(*vstream)); |
50 | if (!vstream) { | |
51 | PERROR("relay viewer stream zmalloc"); | |
52 | goto error; | |
53 | } | |
54 | ||
f5436bfc | 55 | vstream->path_name = lttng_strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX); |
b272577e MD |
56 | if (vstream->path_name == NULL) { |
57 | PERROR("relay viewer path_name alloc"); | |
58 | goto error; | |
59 | } | |
f5436bfc | 60 | vstream->channel_name = lttng_strndup(stream->channel_name, |
2f8f53af | 61 | LTTNG_VIEWER_NAME_MAX); |
b272577e MD |
62 | if (vstream->channel_name == NULL) { |
63 | PERROR("relay viewer channel_name alloc"); | |
64 | goto error; | |
65 | } | |
2f8f53af | 66 | |
a44ca2ca MD |
67 | if (!stream_get(stream)) { |
68 | ERR("Cannot get stream"); | |
69 | goto error; | |
70 | } | |
71 | vstream->stream = stream; | |
72 | ||
73 | pthread_mutex_lock(&stream->lock); | |
74 | ||
75 | if (stream->is_metadata && stream->trace->viewer_metadata_stream) { | |
76 | ERR("Cannot attach viewer metadata stream to trace (busy)."); | |
77 | goto error_unlock; | |
78 | } | |
79 | ||
2f8f53af | 80 | switch (seek_t) { |
c4e361a4 | 81 | case LTTNG_VIEWER_SEEK_BEGINNING: |
a44ca2ca MD |
82 | { |
83 | uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa); | |
84 | ||
85 | if (seq_tail == -1ULL) { | |
86 | /* | |
87 | * Tail may not be initialized yet. Nonetheless, we know | |
88 | * we want to send the first index once it becomes | |
89 | * available. | |
90 | */ | |
91 | seq_tail = 0; | |
92 | } | |
93 | vstream->current_tracefile_id = | |
94 | tracefile_array_get_file_index_tail(stream->tfa); | |
95 | vstream->index_sent_seqcount = seq_tail; | |
2f8f53af | 96 | break; |
a44ca2ca | 97 | } |
c4e361a4 | 98 | case LTTNG_VIEWER_SEEK_LAST: |
a44ca2ca MD |
99 | vstream->current_tracefile_id = |
100 | tracefile_array_get_file_index_head(stream->tfa); | |
101 | /* | |
102 | * We seek at the very end of each stream, awaiting for | |
103 | * a future packet to eventually come in. | |
104 | * | |
105 | * We don't need to check the head position for -1ULL since the | |
106 | * increment will set it to 0. | |
107 | */ | |
108 | vstream->index_sent_seqcount = | |
109 | tracefile_array_get_seq_head(stream->tfa) + 1; | |
2f8f53af DG |
110 | break; |
111 | default: | |
a44ca2ca | 112 | goto error_unlock; |
2f8f53af | 113 | } |
2f8f53af | 114 | |
2f8f53af | 115 | /* |
a44ca2ca MD |
116 | * If we never received an index for the current stream, delay |
117 | * the opening of the index, otherwise open it right now. | |
2f8f53af | 118 | */ |
a44ca2ca | 119 | if (stream->index_received_seqcount == 0) { |
7591bab1 | 120 | vstream->index_fd = NULL; |
2f8f53af DG |
121 | } else { |
122 | int read_fd; | |
123 | ||
124 | read_fd = index_open(vstream->path_name, vstream->channel_name, | |
7591bab1 MD |
125 | stream->tracefile_count, |
126 | vstream->current_tracefile_id); | |
2f8f53af | 127 | if (read_fd < 0) { |
7591bab1 MD |
128 | goto error_unlock; |
129 | } | |
130 | vstream->index_fd = stream_fd_create(read_fd); | |
131 | if (!vstream->index_fd) { | |
132 | if (close(read_fd)) { | |
133 | PERROR("close"); | |
134 | } | |
135 | goto error_unlock; | |
2f8f53af | 136 | } |
2f8f53af DG |
137 | } |
138 | ||
7591bab1 | 139 | if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_fd) { |
2f8f53af DG |
140 | off_t lseek_ret; |
141 | ||
7591bab1 | 142 | lseek_ret = lseek(vstream->index_fd->fd, 0, SEEK_END); |
2f8f53af | 143 | if (lseek_ret < 0) { |
7591bab1 | 144 | goto error_unlock; |
2f8f53af | 145 | } |
7591bab1 | 146 | } |
7591bab1 MD |
147 | if (stream->is_metadata) { |
148 | rcu_assign_pointer(stream->trace->viewer_metadata_stream, | |
149 | vstream); | |
2f8f53af | 150 | } |
a44ca2ca | 151 | pthread_mutex_unlock(&stream->lock); |
2f8f53af | 152 | |
7591bab1 MD |
153 | /* Globally visible after the add unique. */ |
154 | lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle); | |
155 | lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n); | |
156 | ||
157 | pthread_mutex_init(&vstream->reflock, NULL); | |
158 | urcu_ref_init(&vstream->ref); | |
159 | ||
2f8f53af DG |
160 | return vstream; |
161 | ||
7591bab1 MD |
162 | error_unlock: |
163 | pthread_mutex_unlock(&stream->lock); | |
2f8f53af DG |
164 | error: |
165 | if (vstream) { | |
7591bab1 | 166 | viewer_stream_destroy(vstream); |
2f8f53af DG |
167 | } |
168 | return NULL; | |
169 | } | |
170 | ||
7591bab1 | 171 | static void viewer_stream_unpublish(struct relay_viewer_stream *vstream) |
2f8f53af DG |
172 | { |
173 | int ret; | |
174 | struct lttng_ht_iter iter; | |
175 | ||
7591bab1 | 176 | iter.iter.node = &vstream->stream_n.node; |
2f8f53af DG |
177 | ret = lttng_ht_del(viewer_streams_ht, &iter); |
178 | assert(!ret); | |
179 | } | |
180 | ||
7591bab1 | 181 | static void viewer_stream_release(struct urcu_ref *ref) |
2f8f53af | 182 | { |
7591bab1 MD |
183 | struct relay_viewer_stream *vstream = caa_container_of(ref, |
184 | struct relay_viewer_stream, ref); | |
2a174661 | 185 | |
7591bab1 MD |
186 | if (vstream->stream->is_metadata) { |
187 | rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL); | |
2a174661 | 188 | } |
2f8f53af | 189 | |
7591bab1 MD |
190 | viewer_stream_unpublish(vstream); |
191 | ||
192 | if (vstream->stream_fd) { | |
193 | stream_fd_put(vstream->stream_fd); | |
194 | vstream->stream_fd = NULL; | |
2f8f53af | 195 | } |
7591bab1 MD |
196 | if (vstream->index_fd) { |
197 | stream_fd_put(vstream->index_fd); | |
198 | vstream->index_fd = NULL; | |
199 | } | |
200 | if (vstream->stream) { | |
201 | stream_put(vstream->stream); | |
202 | vstream->stream = NULL; | |
203 | } | |
204 | call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu); | |
205 | } | |
206 | ||
207 | /* Must be called with RCU read-side lock held. */ | |
208 | bool viewer_stream_get(struct relay_viewer_stream *vstream) | |
209 | { | |
210 | bool has_ref = false; | |
211 | ||
212 | pthread_mutex_lock(&vstream->reflock); | |
213 | if (vstream->ref.refcount != 0) { | |
214 | has_ref = true; | |
215 | urcu_ref_get(&vstream->ref); | |
2f8f53af | 216 | } |
7591bab1 | 217 | pthread_mutex_unlock(&vstream->reflock); |
2f8f53af | 218 | |
7591bab1 | 219 | return has_ref; |
2f8f53af DG |
220 | } |
221 | ||
222 | /* | |
7591bab1 | 223 | * Get viewer stream by id. |
2f8f53af | 224 | * |
7591bab1 | 225 | * Return viewer stream if found else NULL. |
2f8f53af | 226 | */ |
7591bab1 | 227 | struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id) |
2f8f53af DG |
228 | { |
229 | struct lttng_ht_node_u64 *node; | |
230 | struct lttng_ht_iter iter; | |
7591bab1 | 231 | struct relay_viewer_stream *vstream = NULL; |
2f8f53af | 232 | |
7591bab1 | 233 | rcu_read_lock(); |
2f8f53af DG |
234 | lttng_ht_lookup(viewer_streams_ht, &id, &iter); |
235 | node = lttng_ht_iter_get_node_u64(&iter); | |
236 | if (!node) { | |
237 | DBG("Relay viewer stream %" PRIu64 " not found", id); | |
238 | goto end; | |
239 | } | |
7591bab1 MD |
240 | vstream = caa_container_of(node, struct relay_viewer_stream, stream_n); |
241 | if (!viewer_stream_get(vstream)) { | |
242 | vstream = NULL; | |
243 | } | |
2f8f53af | 244 | end: |
7591bab1 MD |
245 | rcu_read_unlock(); |
246 | return vstream; | |
247 | } | |
248 | ||
249 | void viewer_stream_put(struct relay_viewer_stream *vstream) | |
250 | { | |
251 | rcu_read_lock(); | |
252 | pthread_mutex_lock(&vstream->reflock); | |
253 | urcu_ref_put(&vstream->ref, viewer_stream_release); | |
254 | pthread_mutex_unlock(&vstream->reflock); | |
255 | rcu_read_unlock(); | |
256 | } | |
257 | ||
2f8f53af DG |
258 | /* |
259 | * Rotate a stream to the next tracefile. | |
260 | * | |
7591bab1 | 261 | * Must be called with the rstream lock held. |
2f8f53af DG |
262 | * Returns 0 on success, 1 on EOF, a negative value on error. |
263 | */ | |
7591bab1 | 264 | int viewer_stream_rotate(struct relay_viewer_stream *vstream) |
2f8f53af DG |
265 | { |
266 | int ret; | |
7591bab1 | 267 | struct relay_stream *stream = vstream->stream; |
a44ca2ca | 268 | uint64_t new_id; |
2f8f53af | 269 | |
7591bab1 | 270 | /* Detect the last tracefile to open. */ |
a44ca2ca MD |
271 | if (stream->index_received_seqcount |
272 | == vstream->index_sent_seqcount | |
7591bab1 MD |
273 | && stream->trace->session->connection_closed) { |
274 | ret = 1; | |
2a174661 DG |
275 | goto end; |
276 | } | |
2f8f53af | 277 | |
7591bab1 MD |
278 | if (stream->tracefile_count == 0) { |
279 | /* Ignore rotation, there is none to do. */ | |
280 | ret = 0; | |
2f8f53af DG |
281 | goto end; |
282 | } | |
283 | ||
a44ca2ca MD |
284 | /* |
285 | * Try to move to the next file. | |
286 | */ | |
287 | new_id = (vstream->current_tracefile_id + 1) | |
288 | % stream->tracefile_count; | |
289 | if (tracefile_array_seq_in_file(stream->tfa, new_id, | |
290 | vstream->index_sent_seqcount)) { | |
291 | vstream->current_tracefile_id = new_id; | |
2f8f53af | 292 | } else { |
a44ca2ca MD |
293 | uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa); |
294 | ||
295 | /* | |
296 | * This can only be reached on overwrite, which implies there | |
297 | * has been data written at some point, which will have set the | |
298 | * tail. | |
299 | */ | |
300 | assert(seq_tail != -1ULL); | |
301 | /* | |
302 | * We need to resync because we lag behind tail. | |
303 | */ | |
7591bab1 | 304 | vstream->current_tracefile_id = |
a44ca2ca MD |
305 | tracefile_array_get_file_index_tail(stream->tfa); |
306 | vstream->index_sent_seqcount = seq_tail; | |
2f8f53af | 307 | } |
2f8f53af | 308 | |
7591bab1 MD |
309 | if (vstream->index_fd) { |
310 | stream_fd_put(vstream->index_fd); | |
311 | vstream->index_fd = NULL; | |
2f8f53af | 312 | } |
7591bab1 MD |
313 | if (vstream->stream_fd) { |
314 | stream_fd_put(vstream->stream_fd); | |
315 | vstream->stream_fd = NULL; | |
2f8f53af | 316 | } |
2f8f53af | 317 | |
2f8f53af | 318 | ret = index_open(vstream->path_name, vstream->channel_name, |
7591bab1 MD |
319 | stream->tracefile_count, |
320 | vstream->current_tracefile_id); | |
2f8f53af | 321 | if (ret < 0) { |
7591bab1 MD |
322 | goto end; |
323 | } | |
324 | vstream->index_fd = stream_fd_create(ret); | |
325 | if (vstream->index_fd) { | |
326 | ret = 0; | |
327 | } else { | |
328 | if (close(ret)) { | |
329 | PERROR("close"); | |
330 | } | |
331 | ret = -1; | |
2f8f53af | 332 | } |
2f8f53af | 333 | end: |
2f8f53af DG |
334 | return ret; |
335 | } | |
7591bab1 MD |
336 | |
337 | void print_viewer_streams(void) | |
338 | { | |
339 | struct lttng_ht_iter iter; | |
340 | struct relay_viewer_stream *vstream; | |
341 | ||
342 | rcu_read_lock(); | |
343 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
344 | stream_n.node) { | |
345 | if (!viewer_stream_get(vstream)) { | |
346 | continue; | |
347 | } | |
348 | DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64 | |
349 | " session %" PRIu64, | |
350 | vstream, | |
351 | vstream->ref.refcount, | |
352 | vstream->stream->stream_handle, | |
353 | vstream->stream->trace->id, | |
354 | vstream->stream->trace->session->id); | |
355 | viewer_stream_put(vstream); | |
356 | } | |
357 | rcu_read_unlock(); | |
358 | } |