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 | { |
b4324e73 | 30 | lttng_trace_chunk_put(vstream->stream_file.trace_chunk); |
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 | 46 | { |
1bfb0c63 JG |
47 | struct relay_viewer_stream *vstream = NULL; |
48 | const bool acquired_reference = lttng_trace_chunk_get( | |
49 | stream->trace_chunk); | |
50 | ||
51 | if (!acquired_reference) { | |
52 | goto error; | |
53 | } | |
2f8f53af | 54 | |
2f8f53af DG |
55 | vstream = zmalloc(sizeof(*vstream)); |
56 | if (!vstream) { | |
57 | PERROR("relay viewer stream zmalloc"); | |
58 | goto error; | |
59 | } | |
60 | ||
1bfb0c63 | 61 | vstream->stream_file.trace_chunk = stream->trace_chunk; |
f5436bfc | 62 | vstream->path_name = lttng_strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX); |
b272577e MD |
63 | if (vstream->path_name == NULL) { |
64 | PERROR("relay viewer path_name alloc"); | |
65 | goto error; | |
66 | } | |
f5436bfc | 67 | vstream->channel_name = lttng_strndup(stream->channel_name, |
2f8f53af | 68 | LTTNG_VIEWER_NAME_MAX); |
b272577e MD |
69 | if (vstream->channel_name == NULL) { |
70 | PERROR("relay viewer channel_name alloc"); | |
71 | goto error; | |
72 | } | |
2f8f53af | 73 | |
a44ca2ca MD |
74 | if (!stream_get(stream)) { |
75 | ERR("Cannot get stream"); | |
76 | goto error; | |
77 | } | |
78 | vstream->stream = stream; | |
79 | ||
80 | pthread_mutex_lock(&stream->lock); | |
81 | ||
82 | if (stream->is_metadata && stream->trace->viewer_metadata_stream) { | |
83 | ERR("Cannot attach viewer metadata stream to trace (busy)."); | |
84 | goto error_unlock; | |
85 | } | |
86 | ||
2f8f53af | 87 | switch (seek_t) { |
c4e361a4 | 88 | case LTTNG_VIEWER_SEEK_BEGINNING: |
a44ca2ca MD |
89 | { |
90 | uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa); | |
91 | ||
92 | if (seq_tail == -1ULL) { | |
93 | /* | |
94 | * Tail may not be initialized yet. Nonetheless, we know | |
95 | * we want to send the first index once it becomes | |
96 | * available. | |
97 | */ | |
98 | seq_tail = 0; | |
99 | } | |
100 | vstream->current_tracefile_id = | |
101 | tracefile_array_get_file_index_tail(stream->tfa); | |
102 | vstream->index_sent_seqcount = seq_tail; | |
2f8f53af | 103 | break; |
a44ca2ca | 104 | } |
c4e361a4 | 105 | case LTTNG_VIEWER_SEEK_LAST: |
a44ca2ca MD |
106 | vstream->current_tracefile_id = |
107 | tracefile_array_get_file_index_head(stream->tfa); | |
108 | /* | |
109 | * We seek at the very end of each stream, awaiting for | |
110 | * a future packet to eventually come in. | |
111 | * | |
112 | * We don't need to check the head position for -1ULL since the | |
113 | * increment will set it to 0. | |
114 | */ | |
115 | vstream->index_sent_seqcount = | |
116 | tracefile_array_get_seq_head(stream->tfa) + 1; | |
2f8f53af DG |
117 | break; |
118 | default: | |
a44ca2ca | 119 | goto error_unlock; |
2f8f53af | 120 | } |
2f8f53af | 121 | |
2f8f53af | 122 | /* |
a44ca2ca MD |
123 | * If we never received an index for the current stream, delay |
124 | * the opening of the index, otherwise open it right now. | |
2f8f53af | 125 | */ |
a44ca2ca | 126 | if (stream->index_received_seqcount == 0) { |
f8f3885c | 127 | vstream->index_file = NULL; |
2f8f53af | 128 | } else { |
1bfb0c63 JG |
129 | const uint32_t connection_major = stream->trace->session->major; |
130 | const uint32_t connection_minor = stream->trace->session->minor; | |
131 | ||
132 | vstream->index_file = lttng_index_file_create_from_trace_chunk_read_only( | |
133 | stream->trace_chunk, stream->path_name, | |
134 | stream->channel_name, stream->tracefile_size, | |
135 | vstream->current_tracefile_id, | |
136 | lttng_to_index_major(connection_major, | |
137 | connection_minor), | |
138 | lttng_to_index_minor(connection_major, | |
139 | connection_minor)); | |
f8f3885c | 140 | if (!vstream->index_file) { |
7591bab1 | 141 | goto error_unlock; |
2f8f53af | 142 | } |
2f8f53af DG |
143 | } |
144 | ||
f8f3885c | 145 | if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_file) { |
2f8f53af DG |
146 | off_t lseek_ret; |
147 | ||
f8f3885c | 148 | lseek_ret = lseek(vstream->index_file->fd, 0, SEEK_END); |
2f8f53af | 149 | if (lseek_ret < 0) { |
7591bab1 | 150 | goto error_unlock; |
2f8f53af | 151 | } |
7591bab1 | 152 | } |
7591bab1 MD |
153 | if (stream->is_metadata) { |
154 | rcu_assign_pointer(stream->trace->viewer_metadata_stream, | |
155 | vstream); | |
2f8f53af | 156 | } |
a44ca2ca | 157 | pthread_mutex_unlock(&stream->lock); |
2f8f53af | 158 | |
7591bab1 MD |
159 | /* Globally visible after the add unique. */ |
160 | lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle); | |
161 | lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n); | |
162 | ||
7591bab1 MD |
163 | urcu_ref_init(&vstream->ref); |
164 | ||
2f8f53af DG |
165 | return vstream; |
166 | ||
7591bab1 MD |
167 | error_unlock: |
168 | pthread_mutex_unlock(&stream->lock); | |
2f8f53af DG |
169 | error: |
170 | if (vstream) { | |
7591bab1 | 171 | viewer_stream_destroy(vstream); |
2f8f53af DG |
172 | } |
173 | return NULL; | |
174 | } | |
175 | ||
7591bab1 | 176 | static void viewer_stream_unpublish(struct relay_viewer_stream *vstream) |
2f8f53af DG |
177 | { |
178 | int ret; | |
179 | struct lttng_ht_iter iter; | |
180 | ||
7591bab1 | 181 | iter.iter.node = &vstream->stream_n.node; |
2f8f53af DG |
182 | ret = lttng_ht_del(viewer_streams_ht, &iter); |
183 | assert(!ret); | |
184 | } | |
185 | ||
7591bab1 | 186 | static void viewer_stream_release(struct urcu_ref *ref) |
2f8f53af | 187 | { |
7591bab1 MD |
188 | struct relay_viewer_stream *vstream = caa_container_of(ref, |
189 | struct relay_viewer_stream, ref); | |
2a174661 | 190 | |
7591bab1 MD |
191 | if (vstream->stream->is_metadata) { |
192 | rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL); | |
2a174661 | 193 | } |
2f8f53af | 194 | |
7591bab1 MD |
195 | viewer_stream_unpublish(vstream); |
196 | ||
1bfb0c63 JG |
197 | if (vstream->stream_file.fd) { |
198 | stream_fd_put(vstream->stream_file.fd); | |
199 | vstream->stream_file.fd = NULL; | |
2f8f53af | 200 | } |
f8f3885c MD |
201 | if (vstream->index_file) { |
202 | lttng_index_file_put(vstream->index_file); | |
203 | vstream->index_file = NULL; | |
7591bab1 MD |
204 | } |
205 | if (vstream->stream) { | |
206 | stream_put(vstream->stream); | |
207 | vstream->stream = NULL; | |
208 | } | |
b4324e73 | 209 | |
7591bab1 MD |
210 | call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu); |
211 | } | |
212 | ||
213 | /* Must be called with RCU read-side lock held. */ | |
214 | bool viewer_stream_get(struct relay_viewer_stream *vstream) | |
215 | { | |
ce4d4083 | 216 | return urcu_ref_get_unless_zero(&vstream->ref); |
2f8f53af DG |
217 | } |
218 | ||
219 | /* | |
7591bab1 | 220 | * Get viewer stream by id. |
2f8f53af | 221 | * |
7591bab1 | 222 | * Return viewer stream if found else NULL. |
2f8f53af | 223 | */ |
7591bab1 | 224 | struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id) |
2f8f53af DG |
225 | { |
226 | struct lttng_ht_node_u64 *node; | |
227 | struct lttng_ht_iter iter; | |
7591bab1 | 228 | struct relay_viewer_stream *vstream = NULL; |
2f8f53af | 229 | |
7591bab1 | 230 | rcu_read_lock(); |
2f8f53af DG |
231 | lttng_ht_lookup(viewer_streams_ht, &id, &iter); |
232 | node = lttng_ht_iter_get_node_u64(&iter); | |
233 | if (!node) { | |
234 | DBG("Relay viewer stream %" PRIu64 " not found", id); | |
235 | goto end; | |
236 | } | |
7591bab1 MD |
237 | vstream = caa_container_of(node, struct relay_viewer_stream, stream_n); |
238 | if (!viewer_stream_get(vstream)) { | |
239 | vstream = NULL; | |
240 | } | |
2f8f53af | 241 | end: |
7591bab1 MD |
242 | rcu_read_unlock(); |
243 | return vstream; | |
244 | } | |
245 | ||
246 | void viewer_stream_put(struct relay_viewer_stream *vstream) | |
247 | { | |
248 | rcu_read_lock(); | |
7591bab1 | 249 | urcu_ref_put(&vstream->ref, viewer_stream_release); |
7591bab1 MD |
250 | rcu_read_unlock(); |
251 | } | |
252 | ||
2f8f53af DG |
253 | /* |
254 | * Rotate a stream to the next tracefile. | |
255 | * | |
7591bab1 | 256 | * Must be called with the rstream lock held. |
2f8f53af DG |
257 | * Returns 0 on success, 1 on EOF, a negative value on error. |
258 | */ | |
7591bab1 | 259 | int viewer_stream_rotate(struct relay_viewer_stream *vstream) |
2f8f53af DG |
260 | { |
261 | int ret; | |
a44ca2ca | 262 | uint64_t new_id; |
1bfb0c63 JG |
263 | const struct relay_stream *stream = vstream->stream; |
264 | const uint32_t connection_major = stream->trace->session->major; | |
265 | const uint32_t connection_minor = stream->trace->session->minor; | |
2f8f53af | 266 | |
7591bab1 | 267 | /* Detect the last tracefile to open. */ |
a44ca2ca MD |
268 | if (stream->index_received_seqcount |
269 | == vstream->index_sent_seqcount | |
7591bab1 MD |
270 | && stream->trace->session->connection_closed) { |
271 | ret = 1; | |
2a174661 DG |
272 | goto end; |
273 | } | |
2f8f53af | 274 | |
7591bab1 MD |
275 | if (stream->tracefile_count == 0) { |
276 | /* Ignore rotation, there is none to do. */ | |
277 | ret = 0; | |
2f8f53af DG |
278 | goto end; |
279 | } | |
280 | ||
a44ca2ca MD |
281 | /* |
282 | * Try to move to the next file. | |
283 | */ | |
284 | new_id = (vstream->current_tracefile_id + 1) | |
285 | % stream->tracefile_count; | |
286 | if (tracefile_array_seq_in_file(stream->tfa, new_id, | |
287 | vstream->index_sent_seqcount)) { | |
288 | vstream->current_tracefile_id = new_id; | |
2f8f53af | 289 | } else { |
a44ca2ca MD |
290 | uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa); |
291 | ||
292 | /* | |
293 | * This can only be reached on overwrite, which implies there | |
294 | * has been data written at some point, which will have set the | |
295 | * tail. | |
296 | */ | |
297 | assert(seq_tail != -1ULL); | |
298 | /* | |
299 | * We need to resync because we lag behind tail. | |
300 | */ | |
7591bab1 | 301 | vstream->current_tracefile_id = |
a44ca2ca MD |
302 | tracefile_array_get_file_index_tail(stream->tfa); |
303 | vstream->index_sent_seqcount = seq_tail; | |
2f8f53af | 304 | } |
2f8f53af | 305 | |
f8f3885c MD |
306 | if (vstream->index_file) { |
307 | lttng_index_file_put(vstream->index_file); | |
308 | vstream->index_file = NULL; | |
2f8f53af | 309 | } |
1bfb0c63 JG |
310 | if (vstream->stream_file.fd) { |
311 | stream_fd_put(vstream->stream_file.fd); | |
312 | vstream->stream_file.fd = NULL; | |
2f8f53af | 313 | } |
1bfb0c63 JG |
314 | vstream->index_file = |
315 | lttng_index_file_create_from_trace_chunk_read_only( | |
316 | stream->trace_chunk, stream->path_name, | |
317 | stream->channel_name, | |
318 | stream->tracefile_size, | |
319 | vstream->current_tracefile_id, | |
320 | lttng_to_index_major(connection_major, | |
321 | connection_minor), | |
322 | lttng_to_index_minor(connection_major, | |
323 | connection_minor)); | |
f8f3885c MD |
324 | if (!vstream->index_file) { |
325 | ret = -1; | |
7591bab1 | 326 | goto end; |
7591bab1 | 327 | } else { |
f8f3885c | 328 | ret = 0; |
2f8f53af | 329 | } |
2f8f53af | 330 | end: |
2f8f53af DG |
331 | return ret; |
332 | } | |
7591bab1 MD |
333 | |
334 | void print_viewer_streams(void) | |
335 | { | |
336 | struct lttng_ht_iter iter; | |
337 | struct relay_viewer_stream *vstream; | |
338 | ||
ce3f3ba3 JG |
339 | if (!viewer_streams_ht) { |
340 | return; | |
341 | } | |
342 | ||
7591bab1 MD |
343 | rcu_read_lock(); |
344 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
345 | stream_n.node) { | |
346 | if (!viewer_stream_get(vstream)) { | |
347 | continue; | |
348 | } | |
349 | DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64 | |
350 | " session %" PRIu64, | |
351 | vstream, | |
352 | vstream->ref.refcount, | |
353 | vstream->stream->stream_handle, | |
354 | vstream->stream->trace->id, | |
355 | vstream->stream->trace->session->id); | |
356 | viewer_stream_put(vstream); | |
357 | } | |
358 | rcu_read_unlock(); | |
359 | } |