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6e0be6cc JD |
1 | /* |
2 | * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _LGPL_SOURCE | |
19 | #include <popt.h> | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <sys/stat.h> | |
24 | #include <sys/types.h> | |
25 | #include <unistd.h> | |
8cf2762e JD |
26 | #include <inttypes.h> |
27 | #include <ctype.h> | |
6e0be6cc JD |
28 | |
29 | #include <common/sessiond-comm/sessiond-comm.h> | |
30 | #include <common/mi-lttng.h> | |
31 | ||
32 | #include "../command.h" | |
33 | #include <lttng/rotate.h> | |
34 | ||
35 | static char *opt_session_name; | |
36 | static int opt_no_wait; | |
37 | static struct mi_writer *writer; | |
38 | ||
39 | enum { | |
40 | OPT_HELP = 1, | |
41 | OPT_LIST_OPTIONS, | |
8cf2762e JD |
42 | OPT_TIMER, |
43 | OPT_SIZE, | |
6e0be6cc JD |
44 | }; |
45 | ||
46 | static struct poptOption long_options[] = { | |
47 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
48 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
49 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, | |
50 | {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0}, | |
8cf2762e JD |
51 | {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0}, |
52 | {"timer", 0, POPT_ARG_INT, 0, OPT_TIMER, 0, 0}, | |
53 | {"size", 0, POPT_ARG_INT, 0, OPT_SIZE, 0, 0}, | |
6e0be6cc JD |
54 | {0, 0, 0, 0, 0, 0, 0} |
55 | }; | |
56 | ||
57 | static int mi_print_session(char *session_name, int enabled) | |
58 | { | |
59 | int ret; | |
60 | ||
61 | /* Open session element */ | |
62 | ret = mi_lttng_writer_open_element(writer, config_element_session); | |
63 | if (ret) { | |
64 | goto end; | |
65 | } | |
66 | ||
67 | /* Print session name element */ | |
68 | ret = mi_lttng_writer_write_element_string(writer, config_element_name, | |
69 | session_name); | |
70 | if (ret) { | |
71 | goto end; | |
72 | } | |
73 | ||
74 | ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled, | |
75 | enabled); | |
76 | if (ret) { | |
77 | goto end; | |
78 | } | |
79 | ||
80 | /* Close session element */ | |
81 | ret = mi_lttng_writer_close_element(writer); | |
82 | ||
83 | end: | |
84 | return ret; | |
85 | } | |
86 | ||
8cf2762e JD |
87 | static int setup_rotate(char *session_name, uint64_t timer, uint64_t size) |
88 | { | |
89 | int ret = 0; | |
90 | struct lttng_rotate_session_attr *attr = NULL; | |
91 | ||
92 | attr = lttng_rotate_session_attr_create(); | |
93 | if (!attr) { | |
94 | goto error; | |
95 | } | |
96 | ||
97 | ret = lttng_rotate_session_attr_set_session_name(attr, session_name); | |
98 | if (ret < 0) { | |
99 | goto error; | |
100 | } | |
101 | ||
102 | lttng_rotate_session_attr_set_timer(attr, timer); | |
103 | lttng_rotate_session_attr_set_size(attr, size); | |
104 | ||
105 | if (timer) { | |
106 | DBG("Configuring session %s to rotate every %" PRIu64 " us", | |
107 | session_name, timer); | |
108 | } | |
109 | if (size) { | |
110 | DBG("Configuring session %s to rotate every %" PRIu64 " bytes written", | |
111 | session_name, size); | |
112 | } | |
113 | ||
114 | ret = lttng_rotate_setup(attr); | |
115 | ||
116 | goto end; | |
117 | ||
118 | error: | |
119 | ret = -1; | |
120 | end: | |
121 | return ret; | |
122 | } | |
123 | ||
124 | static int rotate_tracing(char *session_name) | |
6e0be6cc JD |
125 | { |
126 | int ret; | |
8cf2762e | 127 | char *path = NULL; |
6e0be6cc JD |
128 | struct lttng_rotate_session_attr *attr = NULL; |
129 | struct lttng_rotate_session_handle *handle = NULL; | |
130 | enum lttng_rotate_status rotate_status; | |
131 | ||
132 | attr = lttng_rotate_session_attr_create(); | |
133 | if (!attr) { | |
134 | goto error; | |
135 | } | |
136 | ||
6e0be6cc JD |
137 | ret = lttng_rotate_session_attr_set_session_name(attr, session_name); |
138 | if (ret < 0) { | |
139 | goto error; | |
140 | } | |
141 | ||
142 | DBG("Rotating the output files of session %s", session_name); | |
143 | ||
144 | ret = lttng_rotate_session(attr, &handle); | |
145 | if (ret < 0) { | |
146 | switch (-ret) { | |
147 | case LTTNG_ERR_SESSION_NOT_STARTED: | |
148 | WARN("Tracing session %s not started yet", session_name); | |
149 | break; | |
150 | default: | |
151 | ERR("%s", lttng_strerror(ret)); | |
152 | break; | |
153 | } | |
154 | goto error; | |
155 | } | |
156 | ||
157 | if (!opt_no_wait) { | |
158 | _MSG("Waiting for data availability"); | |
159 | fflush(stdout); | |
160 | do { | |
161 | ret = lttng_rotate_session_pending(handle); | |
162 | if (ret < 0) { | |
163 | goto error; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Data sleep time before retrying (in usec). Don't sleep if the call | |
168 | * returned value indicates availability. | |
169 | */ | |
170 | if (ret) { | |
171 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); | |
172 | _MSG("."); | |
173 | fflush(stdout); | |
174 | } | |
175 | } while (ret == 1); | |
176 | MSG(""); | |
177 | } | |
178 | ||
179 | rotate_status = lttng_rotate_session_get_status(handle); | |
180 | switch(rotate_status) { | |
181 | case LTTNG_ROTATE_COMPLETED: | |
182 | lttng_rotate_session_get_output_path(handle, &path); | |
183 | MSG("Output files of session %s rotated to %s", session_name, path); | |
184 | ret = CMD_SUCCESS; | |
185 | goto end; | |
186 | case LTTNG_ROTATE_STARTED: | |
187 | MSG("Rotation started for session %s", session_name); | |
188 | free(path); | |
189 | if (lttng_opt_mi) { | |
190 | ret = mi_print_session(session_name, 1); | |
191 | if (ret) { | |
192 | ret = CMD_ERROR; | |
193 | goto error; | |
194 | } | |
195 | } | |
196 | ||
197 | ret = CMD_SUCCESS; | |
198 | goto end; | |
199 | case LTTNG_ROTATE_EXPIRED: | |
200 | MSG("Output files of session %s rotated, but handle expired", session_name); | |
201 | if (lttng_opt_mi) { | |
202 | ret = mi_print_session(session_name, 1); | |
203 | if (ret) { | |
204 | ret = CMD_ERROR; | |
205 | goto error; | |
206 | } | |
207 | } | |
208 | ||
209 | ret = CMD_SUCCESS; | |
210 | goto end; | |
211 | case LTTNG_ROTATE_ERROR: | |
212 | MSG("An error occurred with the rotation of session %s", session_name); | |
213 | if (lttng_opt_mi) { | |
214 | ret = mi_print_session(session_name, 1); | |
215 | if (ret) { | |
216 | ret = CMD_ERROR; | |
217 | goto error; | |
218 | } | |
219 | } | |
220 | ||
4a478f45 JD |
221 | ret = CMD_SUCCESS; |
222 | goto end; | |
223 | case LTTNG_ROTATE_EMPTY: | |
224 | MSG("Empty session, nothing to rotate."); | |
6e0be6cc JD |
225 | ret = CMD_SUCCESS; |
226 | goto end; | |
227 | } | |
228 | ||
229 | error: | |
230 | ret = CMD_ERROR; | |
231 | end: | |
6e0be6cc JD |
232 | lttng_rotate_session_handle_destroy(handle); |
233 | lttng_rotate_session_attr_destroy(attr); | |
234 | return ret; | |
235 | } | |
236 | ||
237 | /* | |
238 | * cmd_rotate | |
239 | * | |
240 | * The 'rotate <options>' first level command | |
241 | */ | |
242 | int cmd_rotate(int argc, const char **argv) | |
243 | { | |
244 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; | |
245 | static poptContext pc; | |
8cf2762e JD |
246 | char *session_name = NULL; |
247 | char *opt_arg = NULL; | |
248 | uint64_t timer = 0, size = 0; | |
6e0be6cc JD |
249 | |
250 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
251 | poptReadDefaultConfig(pc, 0); | |
252 | ||
253 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
254 | switch (opt) { | |
255 | case OPT_HELP: | |
256 | SHOW_HELP(); | |
257 | goto end; | |
258 | case OPT_LIST_OPTIONS: | |
259 | list_cmd_options(stdout, long_options); | |
260 | goto end; | |
8cf2762e JD |
261 | case OPT_TIMER: |
262 | { | |
263 | errno = 0; | |
264 | opt_arg = poptGetOptArg(pc); | |
265 | timer = strtoull(opt_arg, NULL, 0); | |
266 | if (errno != 0 || !isdigit(opt_arg[0])) { | |
267 | ERR("Wrong value in --timer parameter: %s", opt_arg); | |
268 | ret = CMD_ERROR; | |
269 | goto end; | |
270 | } | |
271 | DBG("Rotation timer set to %" PRIu64, timer); | |
272 | break; | |
273 | } | |
274 | case OPT_SIZE: | |
275 | { | |
276 | errno = 0; | |
277 | opt_arg = poptGetOptArg(pc); | |
278 | size = strtoull(opt_arg, NULL, 0); | |
279 | if (errno != 0 || !isdigit(opt_arg[0])) { | |
280 | ERR("Wrong value in --timer parameter: %s", opt_arg); | |
281 | ret = CMD_ERROR; | |
282 | goto end; | |
283 | } | |
284 | DBG("Rotation size set to %" PRIu64, size); | |
285 | break; | |
286 | } | |
6e0be6cc JD |
287 | default: |
288 | ret = CMD_UNDEFINED; | |
289 | goto end; | |
290 | } | |
291 | } | |
292 | ||
8cf2762e JD |
293 | if (opt_session_name == NULL) { |
294 | session_name = get_session_name(); | |
295 | if (session_name == NULL) { | |
296 | goto end; | |
297 | } | |
298 | } else { | |
299 | session_name = opt_session_name; | |
300 | } | |
6e0be6cc JD |
301 | |
302 | /* Mi check */ | |
303 | if (lttng_opt_mi) { | |
304 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
305 | if (!writer) { | |
306 | ret = -LTTNG_ERR_NOMEM; | |
307 | goto end; | |
308 | } | |
309 | ||
310 | /* Open command element */ | |
311 | ret = mi_lttng_writer_command_open(writer, | |
312 | mi_lttng_element_command_start); | |
313 | if (ret) { | |
314 | ret = CMD_ERROR; | |
315 | goto end; | |
316 | } | |
317 | ||
318 | /* Open output element */ | |
319 | ret = mi_lttng_writer_open_element(writer, | |
320 | mi_lttng_element_command_output); | |
321 | if (ret) { | |
322 | ret = CMD_ERROR; | |
323 | goto end; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Open sessions element | |
328 | * For validation purpose | |
329 | */ | |
330 | ret = mi_lttng_writer_open_element(writer, | |
331 | config_element_sessions); | |
332 | if (ret) { | |
333 | ret = CMD_ERROR; | |
334 | goto end; | |
335 | } | |
336 | } | |
337 | ||
8cf2762e JD |
338 | /* No config options, just rotate the session now */ |
339 | if (timer == 0 && size == 0) { | |
340 | command_ret = rotate_tracing(session_name); | |
341 | } else { | |
342 | command_ret = setup_rotate(session_name, timer, size); | |
343 | } | |
6e0be6cc | 344 | if (command_ret) { |
8cf2762e | 345 | ERR("%s", lttng_strerror(command_ret)); |
6e0be6cc JD |
346 | success = 0; |
347 | } | |
348 | ||
349 | /* Mi closing */ | |
350 | if (lttng_opt_mi) { | |
351 | /* Close sessions and output element */ | |
352 | ret = mi_lttng_close_multi_element(writer, 2); | |
353 | if (ret) { | |
354 | ret = CMD_ERROR; | |
355 | goto end; | |
356 | } | |
357 | ||
358 | /* Success ? */ | |
359 | ret = mi_lttng_writer_write_element_bool(writer, | |
360 | mi_lttng_element_command_success, success); | |
361 | if (ret) { | |
362 | ret = CMD_ERROR; | |
363 | goto end; | |
364 | } | |
365 | ||
366 | /* Command element close */ | |
367 | ret = mi_lttng_writer_command_close(writer); | |
368 | if (ret) { | |
369 | ret = CMD_ERROR; | |
370 | goto end; | |
371 | } | |
372 | } | |
373 | ||
374 | end: | |
375 | /* Mi clean-up */ | |
376 | if (writer && mi_lttng_writer_destroy(writer)) { | |
377 | /* Preserve original error code */ | |
378 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
379 | } | |
380 | ||
381 | /* Overwrite ret if an error occurred with start_tracing */ | |
382 | ret = command_ret ? command_ret : ret; | |
383 | poptFreeContext(pc); | |
8cf2762e | 384 | free(session_name); |
6e0be6cc JD |
385 | return ret; |
386 | } |