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2f8f53af DG |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <common/common.h> | |
21 | #include <common/index/index.h> | |
22 | ||
23 | #include "lttng-relayd.h" | |
24 | #include "viewer-stream.h" | |
25 | ||
26 | static void free_stream(struct relay_viewer_stream *stream) | |
27 | { | |
28 | assert(stream); | |
29 | ||
30 | free(stream->path_name); | |
31 | free(stream->channel_name); | |
32 | free(stream); | |
33 | } | |
34 | ||
35 | static void deferred_free_viewer_stream(struct rcu_head *head) | |
36 | { | |
37 | struct relay_viewer_stream *stream = | |
38 | caa_container_of(head, struct relay_viewer_stream, rcu_node); | |
39 | ||
40 | free_stream(stream); | |
41 | } | |
42 | ||
43 | struct relay_viewer_stream *viewer_stream_create(struct relay_stream *stream, | |
2a174661 | 44 | enum lttng_viewer_seek seek_t, struct ctf_trace *ctf_trace) |
2f8f53af DG |
45 | { |
46 | struct relay_viewer_stream *vstream; | |
47 | ||
48 | assert(stream); | |
2a174661 | 49 | assert(ctf_trace); |
2f8f53af DG |
50 | |
51 | vstream = zmalloc(sizeof(*vstream)); | |
52 | if (!vstream) { | |
53 | PERROR("relay viewer stream zmalloc"); | |
54 | goto error; | |
55 | } | |
56 | ||
2a174661 | 57 | vstream->session_id = stream->session_id; |
2f8f53af DG |
58 | vstream->stream_handle = stream->stream_handle; |
59 | vstream->path_name = strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX); | |
a8267672 MD |
60 | if (vstream->path_name == NULL) { |
61 | PERROR("relay viewer path_name alloc"); | |
62 | goto error; | |
63 | } | |
2f8f53af DG |
64 | vstream->channel_name = strndup(stream->channel_name, |
65 | LTTNG_VIEWER_NAME_MAX); | |
a8267672 MD |
66 | if (vstream->channel_name == NULL) { |
67 | PERROR("relay viewer channel_name alloc"); | |
68 | goto error; | |
69 | } | |
2f8f53af DG |
70 | vstream->tracefile_count = stream->tracefile_count; |
71 | vstream->metadata_flag = stream->metadata_flag; | |
72 | vstream->tracefile_count_last = -1ULL; | |
73 | ||
74 | switch (seek_t) { | |
c4e361a4 | 75 | case LTTNG_VIEWER_SEEK_BEGINNING: |
2f8f53af DG |
76 | vstream->tracefile_count_current = stream->oldest_tracefile_id; |
77 | break; | |
c4e361a4 | 78 | case LTTNG_VIEWER_SEEK_LAST: |
2f8f53af DG |
79 | vstream->tracefile_count_current = stream->tracefile_count_current; |
80 | break; | |
81 | default: | |
82 | assert(0); | |
83 | goto error; | |
84 | } | |
85 | ||
2f8f53af | 86 | if (vstream->metadata_flag) { |
2a174661 | 87 | ctf_trace->viewer_metadata_stream = vstream; |
2f8f53af | 88 | } |
2f8f53af DG |
89 | |
90 | /* Globally visible after the add unique. */ | |
91 | lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle); | |
92 | lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n); | |
93 | ||
94 | vstream->index_read_fd = -1; | |
95 | vstream->read_fd = -1; | |
96 | ||
97 | /* | |
98 | * This is to avoid a race between the initialization of this object and | |
99 | * the close of the given stream. If the stream is unable to find this | |
100 | * viewer stream when closing, this copy will at least take the latest | |
101 | * value. We also need that for the seek_last. | |
102 | */ | |
103 | vstream->total_index_received = stream->total_index_received; | |
104 | ||
105 | /* | |
106 | * If we never received an index for the current stream, delay the opening | |
107 | * of the index, otherwise open it right now. | |
108 | */ | |
109 | if (vstream->tracefile_count_current == stream->tracefile_count_current | |
110 | && vstream->total_index_received == 0) { | |
111 | vstream->index_read_fd = -1; | |
112 | } else { | |
113 | int read_fd; | |
114 | ||
115 | read_fd = index_open(vstream->path_name, vstream->channel_name, | |
116 | vstream->tracefile_count, vstream->tracefile_count_current); | |
117 | if (read_fd < 0) { | |
118 | goto error; | |
119 | } | |
120 | vstream->index_read_fd = read_fd; | |
121 | } | |
122 | ||
c4e361a4 | 123 | if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_read_fd >= 0) { |
2f8f53af DG |
124 | off_t lseek_ret; |
125 | ||
126 | lseek_ret = lseek(vstream->index_read_fd, | |
127 | vstream->total_index_received * sizeof(struct ctf_packet_index), | |
128 | SEEK_CUR); | |
129 | if (lseek_ret < 0) { | |
130 | goto error; | |
131 | } | |
132 | vstream->last_sent_index = vstream->total_index_received; | |
133 | } | |
134 | ||
135 | return vstream; | |
136 | ||
137 | error: | |
138 | if (vstream) { | |
139 | free_stream(vstream); | |
140 | } | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | void viewer_stream_delete(struct relay_viewer_stream *stream) | |
145 | { | |
146 | int ret; | |
147 | struct lttng_ht_iter iter; | |
148 | ||
149 | iter.iter.node = &stream->stream_n.node; | |
150 | ret = lttng_ht_del(viewer_streams_ht, &iter); | |
151 | assert(!ret); | |
152 | } | |
153 | ||
2a174661 DG |
154 | void viewer_stream_destroy(struct ctf_trace *ctf_trace, |
155 | struct relay_viewer_stream *stream) | |
2f8f53af DG |
156 | { |
157 | int ret; | |
2f8f53af DG |
158 | |
159 | assert(stream); | |
2a174661 DG |
160 | |
161 | if (ctf_trace) { | |
162 | ctf_trace_put_ref(ctf_trace); | |
163 | } | |
2f8f53af DG |
164 | |
165 | if (stream->read_fd >= 0) { | |
166 | ret = close(stream->read_fd); | |
167 | if (ret < 0) { | |
168 | PERROR("close read_fd"); | |
169 | } | |
170 | } | |
171 | if (stream->index_read_fd >= 0) { | |
172 | ret = close(stream->index_read_fd); | |
173 | if (ret < 0) { | |
174 | PERROR("close index_read_fd"); | |
175 | } | |
176 | } | |
177 | ||
2f8f53af DG |
178 | call_rcu(&stream->rcu_node, deferred_free_viewer_stream); |
179 | } | |
180 | ||
181 | /* | |
182 | * Find viewer stream by id. RCU read side lock MUST be acquired. | |
183 | * | |
184 | * Return stream if found else NULL. | |
185 | */ | |
186 | struct relay_viewer_stream *viewer_stream_find_by_id(uint64_t id) | |
187 | { | |
188 | struct lttng_ht_node_u64 *node; | |
189 | struct lttng_ht_iter iter; | |
190 | struct relay_viewer_stream *stream = NULL; | |
191 | ||
192 | lttng_ht_lookup(viewer_streams_ht, &id, &iter); | |
193 | node = lttng_ht_iter_get_node_u64(&iter); | |
194 | if (!node) { | |
195 | DBG("Relay viewer stream %" PRIu64 " not found", id); | |
196 | goto end; | |
197 | } | |
198 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); | |
199 | ||
200 | end: | |
201 | return stream; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Rotate a stream to the next tracefile. | |
206 | * | |
56611b06 | 207 | * Must be called with viewer_stream_rotation_lock held. |
2f8f53af DG |
208 | * Returns 0 on success, 1 on EOF, a negative value on error. |
209 | */ | |
210 | int viewer_stream_rotate(struct relay_viewer_stream *vstream, | |
211 | struct relay_stream *stream) | |
212 | { | |
213 | int ret; | |
214 | uint64_t tracefile_id; | |
215 | ||
216 | assert(vstream); | |
2a174661 DG |
217 | assert(stream); |
218 | ||
219 | if (vstream->tracefile_count == 0) { | |
220 | /* Ignore rotation, there is none to do. */ | |
221 | ret = 0; | |
222 | goto end; | |
223 | } | |
2f8f53af DG |
224 | |
225 | tracefile_id = (vstream->tracefile_count_current + 1) % | |
226 | vstream->tracefile_count; | |
227 | ||
228 | /* Detect the last tracefile to open. */ | |
229 | if (vstream->tracefile_count_last != -1ULL && | |
230 | vstream->tracefile_count_last == | |
231 | vstream->tracefile_count_current) { | |
232 | ret = 1; | |
233 | goto end; | |
234 | } | |
235 | ||
2f8f53af DG |
236 | /* |
237 | * The writer and the reader are not working in the same tracefile, we can | |
238 | * read up to EOF, we don't care about the total_index_received. | |
239 | */ | |
2a174661 | 240 | if (stream->close_flag || (stream->tracefile_count_current != tracefile_id)) { |
2f8f53af DG |
241 | vstream->close_write_flag = 1; |
242 | } else { | |
243 | /* | |
244 | * We are opening a file that is still open in write, make sure we | |
245 | * limit our reading to the number of indexes received. | |
246 | */ | |
247 | vstream->close_write_flag = 0; | |
2a174661 | 248 | if (stream->close_flag) { |
2f8f53af DG |
249 | vstream->total_index_received = stream->total_index_received; |
250 | } | |
251 | } | |
252 | vstream->tracefile_count_current = tracefile_id; | |
253 | ||
254 | ret = close(vstream->index_read_fd); | |
255 | if (ret < 0) { | |
256 | PERROR("close index file %d", vstream->index_read_fd); | |
257 | } | |
258 | vstream->index_read_fd = -1; | |
259 | ||
260 | ret = close(vstream->read_fd); | |
261 | if (ret < 0) { | |
262 | PERROR("close tracefile %d", vstream->read_fd); | |
263 | } | |
264 | vstream->read_fd = -1; | |
265 | ||
266 | pthread_mutex_lock(&vstream->overwrite_lock); | |
267 | vstream->abort_flag = 0; | |
268 | pthread_mutex_unlock(&vstream->overwrite_lock); | |
269 | ||
2f8f53af DG |
270 | ret = index_open(vstream->path_name, vstream->channel_name, |
271 | vstream->tracefile_count, vstream->tracefile_count_current); | |
272 | if (ret < 0) { | |
273 | goto error; | |
274 | } | |
275 | vstream->index_read_fd = ret; | |
276 | ||
277 | ret = 0; | |
278 | ||
279 | end: | |
280 | error: | |
281 | return ret; | |
282 | } |