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> | |
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 | ||
2f8f53af | 54 | vstream->path_name = 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 | } | |
2f8f53af DG |
59 | vstream->channel_name = strndup(stream->channel_name, |
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 DG |
65 | |
66 | switch (seek_t) { | |
c4e361a4 | 67 | case LTTNG_VIEWER_SEEK_BEGINNING: |
7591bab1 | 68 | vstream->current_tracefile_id = stream->oldest_tracefile_id; |
2f8f53af | 69 | break; |
c4e361a4 | 70 | case LTTNG_VIEWER_SEEK_LAST: |
7591bab1 | 71 | vstream->current_tracefile_id = stream->current_tracefile_id; |
2f8f53af DG |
72 | break; |
73 | default: | |
2f8f53af DG |
74 | goto error; |
75 | } | |
7591bab1 MD |
76 | if (!stream_get(stream)) { |
77 | ERR("Cannot get stream"); | |
78 | goto error; | |
2f8f53af | 79 | } |
7591bab1 | 80 | vstream->stream = stream; |
2f8f53af | 81 | |
7591bab1 | 82 | pthread_mutex_lock(&stream->lock); |
2f8f53af DG |
83 | /* |
84 | * If we never received an index for the current stream, delay the opening | |
85 | * of the index, otherwise open it right now. | |
86 | */ | |
7591bab1 MD |
87 | if (vstream->current_tracefile_id == stream->current_tracefile_id |
88 | && stream->total_index_received == 0) { | |
89 | vstream->index_fd = NULL; | |
2f8f53af DG |
90 | } else { |
91 | int read_fd; | |
92 | ||
93 | read_fd = index_open(vstream->path_name, vstream->channel_name, | |
7591bab1 MD |
94 | stream->tracefile_count, |
95 | vstream->current_tracefile_id); | |
2f8f53af | 96 | if (read_fd < 0) { |
7591bab1 MD |
97 | goto error_unlock; |
98 | } | |
99 | vstream->index_fd = stream_fd_create(read_fd); | |
100 | if (!vstream->index_fd) { | |
101 | if (close(read_fd)) { | |
102 | PERROR("close"); | |
103 | } | |
104 | goto error_unlock; | |
2f8f53af | 105 | } |
2f8f53af DG |
106 | } |
107 | ||
7591bab1 | 108 | if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_fd) { |
2f8f53af DG |
109 | off_t lseek_ret; |
110 | ||
7591bab1 | 111 | lseek_ret = lseek(vstream->index_fd->fd, 0, SEEK_END); |
2f8f53af | 112 | if (lseek_ret < 0) { |
7591bab1 | 113 | goto error_unlock; |
2f8f53af | 114 | } |
7591bab1 MD |
115 | vstream->last_sent_index = stream->total_index_received; |
116 | } | |
117 | pthread_mutex_unlock(&stream->lock); | |
118 | ||
119 | if (stream->is_metadata) { | |
120 | rcu_assign_pointer(stream->trace->viewer_metadata_stream, | |
121 | vstream); | |
2f8f53af DG |
122 | } |
123 | ||
7591bab1 MD |
124 | /* Globally visible after the add unique. */ |
125 | lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle); | |
126 | lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n); | |
127 | ||
128 | pthread_mutex_init(&vstream->reflock, NULL); | |
129 | urcu_ref_init(&vstream->ref); | |
130 | ||
2f8f53af DG |
131 | return vstream; |
132 | ||
7591bab1 MD |
133 | error_unlock: |
134 | pthread_mutex_unlock(&stream->lock); | |
2f8f53af DG |
135 | error: |
136 | if (vstream) { | |
7591bab1 | 137 | viewer_stream_destroy(vstream); |
2f8f53af DG |
138 | } |
139 | return NULL; | |
140 | } | |
141 | ||
7591bab1 | 142 | static void viewer_stream_unpublish(struct relay_viewer_stream *vstream) |
2f8f53af DG |
143 | { |
144 | int ret; | |
145 | struct lttng_ht_iter iter; | |
146 | ||
7591bab1 | 147 | iter.iter.node = &vstream->stream_n.node; |
2f8f53af DG |
148 | ret = lttng_ht_del(viewer_streams_ht, &iter); |
149 | assert(!ret); | |
150 | } | |
151 | ||
7591bab1 | 152 | static void viewer_stream_release(struct urcu_ref *ref) |
2f8f53af | 153 | { |
7591bab1 MD |
154 | struct relay_viewer_stream *vstream = caa_container_of(ref, |
155 | struct relay_viewer_stream, ref); | |
2a174661 | 156 | |
7591bab1 MD |
157 | if (vstream->stream->is_metadata) { |
158 | rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL); | |
2a174661 | 159 | } |
2f8f53af | 160 | |
7591bab1 MD |
161 | viewer_stream_unpublish(vstream); |
162 | ||
163 | if (vstream->stream_fd) { | |
164 | stream_fd_put(vstream->stream_fd); | |
165 | vstream->stream_fd = NULL; | |
2f8f53af | 166 | } |
7591bab1 MD |
167 | if (vstream->index_fd) { |
168 | stream_fd_put(vstream->index_fd); | |
169 | vstream->index_fd = NULL; | |
170 | } | |
171 | if (vstream->stream) { | |
172 | stream_put(vstream->stream); | |
173 | vstream->stream = NULL; | |
174 | } | |
175 | call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu); | |
176 | } | |
177 | ||
178 | /* Must be called with RCU read-side lock held. */ | |
179 | bool viewer_stream_get(struct relay_viewer_stream *vstream) | |
180 | { | |
181 | bool has_ref = false; | |
182 | ||
183 | pthread_mutex_lock(&vstream->reflock); | |
184 | if (vstream->ref.refcount != 0) { | |
185 | has_ref = true; | |
186 | urcu_ref_get(&vstream->ref); | |
2f8f53af | 187 | } |
7591bab1 | 188 | pthread_mutex_unlock(&vstream->reflock); |
2f8f53af | 189 | |
7591bab1 | 190 | return has_ref; |
2f8f53af DG |
191 | } |
192 | ||
193 | /* | |
7591bab1 | 194 | * Get viewer stream by id. |
2f8f53af | 195 | * |
7591bab1 | 196 | * Return viewer stream if found else NULL. |
2f8f53af | 197 | */ |
7591bab1 | 198 | struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id) |
2f8f53af DG |
199 | { |
200 | struct lttng_ht_node_u64 *node; | |
201 | struct lttng_ht_iter iter; | |
7591bab1 | 202 | struct relay_viewer_stream *vstream = NULL; |
2f8f53af | 203 | |
7591bab1 | 204 | rcu_read_lock(); |
2f8f53af DG |
205 | lttng_ht_lookup(viewer_streams_ht, &id, &iter); |
206 | node = lttng_ht_iter_get_node_u64(&iter); | |
207 | if (!node) { | |
208 | DBG("Relay viewer stream %" PRIu64 " not found", id); | |
209 | goto end; | |
210 | } | |
7591bab1 MD |
211 | vstream = caa_container_of(node, struct relay_viewer_stream, stream_n); |
212 | if (!viewer_stream_get(vstream)) { | |
213 | vstream = NULL; | |
214 | } | |
2f8f53af | 215 | end: |
7591bab1 MD |
216 | rcu_read_unlock(); |
217 | return vstream; | |
218 | } | |
219 | ||
220 | void viewer_stream_put(struct relay_viewer_stream *vstream) | |
221 | { | |
222 | rcu_read_lock(); | |
223 | pthread_mutex_lock(&vstream->reflock); | |
224 | urcu_ref_put(&vstream->ref, viewer_stream_release); | |
225 | pthread_mutex_unlock(&vstream->reflock); | |
226 | rcu_read_unlock(); | |
227 | } | |
228 | ||
229 | /* | |
230 | * Returns whether the current tracefile is readable. If not, it has | |
231 | * been overwritten. | |
232 | * Must be called with rstream lock held. | |
233 | */ | |
234 | bool viewer_stream_is_tracefile_seq_readable(struct relay_viewer_stream *vstream, | |
235 | uint64_t seq) | |
236 | { | |
237 | struct relay_stream *stream = vstream->stream; | |
238 | ||
239 | if (seq >= stream->oldest_tracefile_seq | |
240 | && seq <= stream->current_tracefile_seq) { | |
241 | /* seq is a readable file. */ | |
242 | return true; | |
243 | } else { | |
244 | /* seq is not readable. */ | |
245 | return false; | |
246 | } | |
2f8f53af DG |
247 | } |
248 | ||
249 | /* | |
250 | * Rotate a stream to the next tracefile. | |
251 | * | |
7591bab1 | 252 | * Must be called with the rstream lock held. |
2f8f53af DG |
253 | * Returns 0 on success, 1 on EOF, a negative value on error. |
254 | */ | |
7591bab1 | 255 | int viewer_stream_rotate(struct relay_viewer_stream *vstream) |
2f8f53af DG |
256 | { |
257 | int ret; | |
7591bab1 | 258 | struct relay_stream *stream = vstream->stream; |
2f8f53af | 259 | |
7591bab1 MD |
260 | /* Detect the last tracefile to open. */ |
261 | if (stream->total_index_received == vstream->last_sent_index | |
262 | && stream->trace->session->connection_closed) { | |
263 | ret = 1; | |
2a174661 DG |
264 | goto end; |
265 | } | |
2f8f53af | 266 | |
7591bab1 MD |
267 | if (stream->tracefile_count == 0) { |
268 | /* Ignore rotation, there is none to do. */ | |
269 | ret = 0; | |
2f8f53af DG |
270 | goto end; |
271 | } | |
272 | ||
7591bab1 MD |
273 | if (!viewer_stream_is_tracefile_seq_readable(vstream, |
274 | vstream->current_tracefile_seq + 1)) { | |
275 | vstream->current_tracefile_id = | |
276 | stream->oldest_tracefile_id; | |
277 | vstream->current_tracefile_seq = | |
278 | stream->oldest_tracefile_seq; | |
2f8f53af | 279 | } else { |
7591bab1 MD |
280 | vstream->current_tracefile_id = |
281 | (vstream->current_tracefile_id + 1) | |
282 | % stream->tracefile_count; | |
283 | vstream->current_tracefile_seq++; | |
2f8f53af | 284 | } |
2f8f53af | 285 | |
7591bab1 MD |
286 | if (vstream->index_fd) { |
287 | stream_fd_put(vstream->index_fd); | |
288 | vstream->index_fd = NULL; | |
2f8f53af | 289 | } |
7591bab1 MD |
290 | if (vstream->stream_fd) { |
291 | stream_fd_put(vstream->stream_fd); | |
292 | vstream->stream_fd = NULL; | |
2f8f53af | 293 | } |
2f8f53af | 294 | |
2f8f53af | 295 | ret = index_open(vstream->path_name, vstream->channel_name, |
7591bab1 MD |
296 | stream->tracefile_count, |
297 | vstream->current_tracefile_id); | |
2f8f53af | 298 | if (ret < 0) { |
7591bab1 MD |
299 | goto end; |
300 | } | |
301 | vstream->index_fd = stream_fd_create(ret); | |
302 | if (vstream->index_fd) { | |
303 | ret = 0; | |
304 | } else { | |
305 | if (close(ret)) { | |
306 | PERROR("close"); | |
307 | } | |
308 | ret = -1; | |
2f8f53af | 309 | } |
2f8f53af | 310 | end: |
2f8f53af DG |
311 | return ret; |
312 | } | |
7591bab1 MD |
313 | |
314 | void print_viewer_streams(void) | |
315 | { | |
316 | struct lttng_ht_iter iter; | |
317 | struct relay_viewer_stream *vstream; | |
318 | ||
319 | rcu_read_lock(); | |
320 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
321 | stream_n.node) { | |
322 | if (!viewer_stream_get(vstream)) { | |
323 | continue; | |
324 | } | |
325 | DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64 | |
326 | " session %" PRIu64, | |
327 | vstream, | |
328 | vstream->ref.refcount, | |
329 | vstream->stream->stream_handle, | |
330 | vstream->stream->trace->id, | |
331 | vstream->stream->trace->session->id); | |
332 | viewer_stream_put(vstream); | |
333 | } | |
334 | rcu_read_unlock(); | |
335 | } |