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> | |
9a78c92e | 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 | |
21 | #include <common/common.h> | |
22 | #include <common/index/index.h> | |
23 | ||
24 | #include "lttng-relayd.h" | |
25 | #include "viewer-stream.h" | |
26 | ||
9a78c92e | 27 | static void viewer_stream_destroy(struct relay_viewer_stream *vstream) |
2f8f53af | 28 | { |
9a78c92e MD |
29 | free(vstream->path_name); |
30 | free(vstream->channel_name); | |
31 | free(vstream); | |
2f8f53af DG |
32 | } |
33 | ||
9a78c92e | 34 | static void viewer_stream_destroy_rcu(struct rcu_head *head) |
2f8f53af | 35 | { |
9a78c92e | 36 | struct relay_viewer_stream *vstream = |
2f8f53af DG |
37 | caa_container_of(head, struct relay_viewer_stream, rcu_node); |
38 | ||
9a78c92e | 39 | viewer_stream_destroy(vstream); |
2f8f53af DG |
40 | } |
41 | ||
42 | struct relay_viewer_stream *viewer_stream_create(struct relay_stream *stream, | |
9a78c92e | 43 | enum lttng_viewer_seek seek_t) |
2f8f53af DG |
44 | { |
45 | struct relay_viewer_stream *vstream; | |
46 | ||
2f8f53af DG |
47 | vstream = zmalloc(sizeof(*vstream)); |
48 | if (!vstream) { | |
49 | PERROR("relay viewer stream zmalloc"); | |
50 | goto error; | |
51 | } | |
52 | ||
2f8f53af | 53 | vstream->path_name = strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX); |
a8267672 MD |
54 | if (vstream->path_name == NULL) { |
55 | PERROR("relay viewer path_name alloc"); | |
56 | goto error; | |
57 | } | |
2f8f53af DG |
58 | vstream->channel_name = strndup(stream->channel_name, |
59 | LTTNG_VIEWER_NAME_MAX); | |
a8267672 MD |
60 | if (vstream->channel_name == NULL) { |
61 | PERROR("relay viewer channel_name alloc"); | |
62 | goto error; | |
63 | } | |
2f8f53af DG |
64 | |
65 | switch (seek_t) { | |
c4e361a4 | 66 | case LTTNG_VIEWER_SEEK_BEGINNING: |
9a78c92e | 67 | vstream->current_tracefile_id = stream->oldest_tracefile_id; |
2f8f53af | 68 | break; |
c4e361a4 | 69 | case LTTNG_VIEWER_SEEK_LAST: |
9a78c92e | 70 | vstream->current_tracefile_id = stream->current_tracefile_id; |
2f8f53af DG |
71 | break; |
72 | default: | |
2f8f53af DG |
73 | goto error; |
74 | } | |
9a78c92e MD |
75 | if (!stream_get(stream)) { |
76 | ERR("Cannot get stream"); | |
77 | goto error; | |
2f8f53af | 78 | } |
9a78c92e | 79 | vstream->stream = stream; |
2f8f53af | 80 | |
9a78c92e | 81 | pthread_mutex_lock(&stream->lock); |
2f8f53af DG |
82 | /* |
83 | * If we never received an index for the current stream, delay the opening | |
84 | * of the index, otherwise open it right now. | |
85 | */ | |
9a78c92e MD |
86 | if (vstream->current_tracefile_id == stream->current_tracefile_id |
87 | && stream->total_index_received == 0) { | |
88 | vstream->index_fd = NULL; | |
2f8f53af DG |
89 | } else { |
90 | int read_fd; | |
91 | ||
92 | read_fd = index_open(vstream->path_name, vstream->channel_name, | |
9a78c92e MD |
93 | stream->tracefile_count, |
94 | vstream->current_tracefile_id); | |
2f8f53af | 95 | if (read_fd < 0) { |
9a78c92e MD |
96 | goto error_unlock; |
97 | } | |
98 | vstream->index_fd = stream_fd_create(read_fd); | |
99 | if (!vstream->index_fd) { | |
100 | if (close(read_fd)) { | |
101 | PERROR("close"); | |
102 | } | |
103 | goto error_unlock; | |
2f8f53af | 104 | } |
2f8f53af DG |
105 | } |
106 | ||
9a78c92e | 107 | if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_fd) { |
2f8f53af DG |
108 | off_t lseek_ret; |
109 | ||
9a78c92e | 110 | lseek_ret = lseek(vstream->index_fd->fd, 0, SEEK_END); |
2f8f53af | 111 | if (lseek_ret < 0) { |
9a78c92e | 112 | goto error_unlock; |
2f8f53af | 113 | } |
9a78c92e MD |
114 | vstream->last_sent_index = stream->total_index_received; |
115 | } | |
116 | pthread_mutex_unlock(&stream->lock); | |
117 | ||
118 | if (stream->is_metadata) { | |
119 | rcu_assign_pointer(stream->trace->viewer_metadata_stream, | |
120 | vstream); | |
2f8f53af DG |
121 | } |
122 | ||
9a78c92e MD |
123 | /* Globally visible after the add unique. */ |
124 | lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle); | |
125 | lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n); | |
126 | ||
127 | pthread_mutex_init(&vstream->reflock, NULL); | |
128 | urcu_ref_init(&vstream->ref); | |
129 | ||
2f8f53af DG |
130 | return vstream; |
131 | ||
9a78c92e MD |
132 | error_unlock: |
133 | pthread_mutex_unlock(&stream->lock); | |
2f8f53af DG |
134 | error: |
135 | if (vstream) { | |
9a78c92e | 136 | viewer_stream_destroy(vstream); |
2f8f53af DG |
137 | } |
138 | return NULL; | |
139 | } | |
140 | ||
9a78c92e | 141 | static void viewer_stream_unpublish(struct relay_viewer_stream *vstream) |
2f8f53af DG |
142 | { |
143 | int ret; | |
144 | struct lttng_ht_iter iter; | |
145 | ||
9a78c92e | 146 | iter.iter.node = &vstream->stream_n.node; |
2f8f53af DG |
147 | ret = lttng_ht_del(viewer_streams_ht, &iter); |
148 | assert(!ret); | |
149 | } | |
150 | ||
9a78c92e | 151 | static void viewer_stream_release(struct urcu_ref *ref) |
2f8f53af | 152 | { |
9a78c92e MD |
153 | struct relay_viewer_stream *vstream = caa_container_of(ref, |
154 | struct relay_viewer_stream, ref); | |
2a174661 | 155 | |
9a78c92e MD |
156 | if (vstream->stream->is_metadata) { |
157 | rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL); | |
2a174661 | 158 | } |
2f8f53af | 159 | |
9a78c92e MD |
160 | viewer_stream_unpublish(vstream); |
161 | ||
162 | if (vstream->stream_fd) { | |
163 | stream_fd_put(vstream->stream_fd); | |
164 | vstream->stream_fd = NULL; | |
2f8f53af | 165 | } |
9a78c92e MD |
166 | if (vstream->index_fd) { |
167 | stream_fd_put(vstream->index_fd); | |
168 | vstream->index_fd = NULL; | |
169 | } | |
170 | if (vstream->stream) { | |
171 | stream_put(vstream->stream); | |
172 | vstream->stream = NULL; | |
173 | } | |
174 | call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu); | |
175 | } | |
176 | ||
177 | /* Must be called with RCU read-side lock held. */ | |
178 | bool viewer_stream_get(struct relay_viewer_stream *vstream) | |
179 | { | |
180 | bool has_ref = false; | |
181 | ||
182 | pthread_mutex_lock(&vstream->reflock); | |
183 | if (vstream->ref.refcount != 0) { | |
184 | has_ref = true; | |
185 | urcu_ref_get(&vstream->ref); | |
2f8f53af | 186 | } |
9a78c92e | 187 | pthread_mutex_unlock(&vstream->reflock); |
2f8f53af | 188 | |
9a78c92e | 189 | return has_ref; |
2f8f53af DG |
190 | } |
191 | ||
192 | /* | |
9a78c92e | 193 | * Get viewer stream by id. |
2f8f53af | 194 | * |
9a78c92e | 195 | * Return viewer stream if found else NULL. |
2f8f53af | 196 | */ |
9a78c92e | 197 | struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id) |
2f8f53af DG |
198 | { |
199 | struct lttng_ht_node_u64 *node; | |
200 | struct lttng_ht_iter iter; | |
9a78c92e | 201 | struct relay_viewer_stream *vstream = NULL; |
2f8f53af | 202 | |
9a78c92e | 203 | rcu_read_lock(); |
2f8f53af DG |
204 | lttng_ht_lookup(viewer_streams_ht, &id, &iter); |
205 | node = lttng_ht_iter_get_node_u64(&iter); | |
206 | if (!node) { | |
207 | DBG("Relay viewer stream %" PRIu64 " not found", id); | |
208 | goto end; | |
209 | } | |
9a78c92e MD |
210 | vstream = caa_container_of(node, struct relay_viewer_stream, stream_n); |
211 | if (!viewer_stream_get(vstream)) { | |
212 | vstream = NULL; | |
213 | } | |
2f8f53af | 214 | end: |
9a78c92e MD |
215 | rcu_read_unlock(); |
216 | return vstream; | |
217 | } | |
218 | ||
219 | void viewer_stream_put(struct relay_viewer_stream *vstream) | |
220 | { | |
221 | rcu_read_lock(); | |
222 | pthread_mutex_lock(&vstream->reflock); | |
223 | urcu_ref_put(&vstream->ref, viewer_stream_release); | |
224 | pthread_mutex_unlock(&vstream->reflock); | |
225 | rcu_read_unlock(); | |
226 | } | |
227 | ||
228 | /* | |
229 | * Returns whether the current tracefile is readable. If not, it has | |
230 | * been overwritten. | |
231 | * Must be called with rstream lock held. | |
232 | */ | |
233 | bool viewer_stream_is_tracefile_seq_readable(struct relay_viewer_stream *vstream, | |
234 | uint64_t seq) | |
235 | { | |
236 | struct relay_stream *stream = vstream->stream; | |
237 | ||
238 | if (seq >= stream->oldest_tracefile_seq | |
239 | && seq <= stream->current_tracefile_seq) { | |
240 | /* seq is a readable file. */ | |
241 | return true; | |
242 | } else { | |
243 | /* seq is not readable. */ | |
244 | return false; | |
245 | } | |
2f8f53af DG |
246 | } |
247 | ||
248 | /* | |
249 | * Rotate a stream to the next tracefile. | |
250 | * | |
9a78c92e | 251 | * Must be called with the rstream lock held. |
2f8f53af DG |
252 | * Returns 0 on success, 1 on EOF, a negative value on error. |
253 | */ | |
9a78c92e | 254 | int viewer_stream_rotate(struct relay_viewer_stream *vstream) |
2f8f53af DG |
255 | { |
256 | int ret; | |
9a78c92e | 257 | struct relay_stream *stream = vstream->stream; |
2f8f53af | 258 | |
9a78c92e MD |
259 | /* Detect the last tracefile to open. */ |
260 | if (stream->total_index_received == vstream->last_sent_index | |
261 | && stream->trace->session->connection_closed) { | |
262 | ret = 1; | |
2a174661 DG |
263 | goto end; |
264 | } | |
2f8f53af | 265 | |
9a78c92e MD |
266 | if (stream->tracefile_count == 0) { |
267 | /* Ignore rotation, there is none to do. */ | |
268 | ret = 0; | |
2f8f53af DG |
269 | goto end; |
270 | } | |
271 | ||
9a78c92e MD |
272 | if (!viewer_stream_is_tracefile_seq_readable(vstream, |
273 | vstream->current_tracefile_seq + 1)) { | |
274 | vstream->current_tracefile_id = | |
275 | stream->oldest_tracefile_id; | |
276 | vstream->current_tracefile_seq = | |
277 | stream->oldest_tracefile_seq; | |
2f8f53af | 278 | } else { |
9a78c92e MD |
279 | vstream->current_tracefile_id = |
280 | (vstream->current_tracefile_id + 1) | |
281 | % stream->tracefile_count; | |
282 | vstream->current_tracefile_seq++; | |
2f8f53af | 283 | } |
2f8f53af | 284 | |
9a78c92e MD |
285 | if (vstream->index_fd) { |
286 | stream_fd_put(vstream->index_fd); | |
287 | vstream->index_fd = NULL; | |
2f8f53af | 288 | } |
9a78c92e MD |
289 | if (vstream->stream_fd) { |
290 | stream_fd_put(vstream->stream_fd); | |
291 | vstream->stream_fd = NULL; | |
2f8f53af | 292 | } |
2f8f53af | 293 | |
2f8f53af | 294 | ret = index_open(vstream->path_name, vstream->channel_name, |
9a78c92e MD |
295 | stream->tracefile_count, |
296 | vstream->current_tracefile_id); | |
2f8f53af | 297 | if (ret < 0) { |
9a78c92e MD |
298 | goto end; |
299 | } | |
300 | vstream->index_fd = stream_fd_create(ret); | |
301 | if (vstream->index_fd) { | |
302 | ret = 0; | |
303 | } else { | |
304 | if (close(ret)) { | |
305 | PERROR("close"); | |
306 | } | |
307 | ret = -1; | |
2f8f53af | 308 | } |
2f8f53af | 309 | end: |
2f8f53af DG |
310 | return ret; |
311 | } | |
9a78c92e MD |
312 | |
313 | void print_viewer_streams(void) | |
314 | { | |
315 | struct lttng_ht_iter iter; | |
316 | struct relay_viewer_stream *vstream; | |
317 | ||
318 | rcu_read_lock(); | |
319 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
320 | stream_n.node) { | |
321 | if (!viewer_stream_get(vstream)) { | |
322 | continue; | |
323 | } | |
324 | DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64 | |
325 | " session %" PRIu64, | |
326 | vstream, | |
327 | vstream->ref.refcount, | |
328 | vstream->stream->stream_handle, | |
329 | vstream->stream->trace->id, | |
330 | vstream->stream->trace->session->id); | |
331 | viewer_stream_put(vstream); | |
332 | } | |
333 | rcu_read_unlock(); | |
334 | } |