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d68c9a04 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> | |
26 | #include <inttypes.h> | |
27 | #include <ctype.h> | |
28 | #include <assert.h> | |
29 | ||
30 | #include <common/sessiond-comm/sessiond-comm.h> | |
31 | #include <common/mi-lttng.h> | |
32 | ||
33 | #include "../command.h" | |
34 | #include <lttng/rotation.h> | |
35 | ||
36 | static char *opt_session_name; | |
37 | static int opt_no_wait; | |
38 | static struct mi_writer *writer; | |
39 | ||
40 | enum { | |
41 | OPT_HELP = 1, | |
42 | OPT_LIST_OPTIONS, | |
43 | }; | |
44 | ||
45 | static struct poptOption long_options[] = { | |
46 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
47 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
48 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, | |
49 | {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0}, | |
50 | {0, 0, 0, 0, 0, 0, 0} | |
51 | }; | |
52 | ||
53 | static int mi_output_rotate(const char *status, const char *path, | |
54 | const char *session_name) | |
55 | { | |
56 | int ret; | |
57 | ||
58 | if (!lttng_opt_mi) { | |
59 | ret = 0; | |
60 | goto end; | |
61 | } | |
62 | ||
63 | ret = mi_lttng_writer_open_element(writer, | |
64 | mi_lttng_element_rotation); | |
65 | if (ret) { | |
66 | goto end; | |
67 | } | |
68 | ||
69 | ret = mi_lttng_writer_write_element_string(writer, | |
70 | mi_lttng_element_session_name, session_name); | |
71 | if (ret) { | |
72 | goto end; | |
73 | } | |
74 | ||
75 | ret = mi_lttng_writer_write_element_string(writer, | |
76 | mi_lttng_element_rotate_status, status); | |
77 | if (ret) { | |
78 | goto end; | |
79 | } | |
80 | if (path) { | |
81 | ret = mi_lttng_writer_write_element_string(writer, | |
82 | config_element_path, path); | |
83 | if (ret) { | |
84 | goto end; | |
85 | } | |
86 | } | |
87 | /* Close rotation element */ | |
88 | ret = mi_lttng_writer_close_element(writer); | |
89 | if (ret) { | |
90 | goto end; | |
91 | } | |
92 | ||
93 | end: | |
94 | return ret; | |
95 | } | |
96 | ||
97 | static int rotate_tracing(char *session_name) | |
98 | { | |
99 | int ret; | |
100 | struct lttng_rotation_immediate_attr *attr = NULL; | |
101 | struct lttng_rotation_handle *handle = NULL; | |
102 | enum lttng_rotation_status rotation_status; | |
103 | enum lttng_rotation_state rotation_state = LTTNG_ROTATION_STATE_ONGOING; | |
104 | ||
105 | DBG("Rotating the output files of session %s", session_name); | |
106 | ||
107 | attr = lttng_rotation_immediate_attr_create(); | |
108 | if (!attr) { | |
109 | goto error; | |
110 | } | |
111 | ||
112 | ret = lttng_rotation_immediate_attr_set_session_name(attr, session_name); | |
113 | if (ret < 0) { | |
114 | ERR("Session name exceeds the maximal allowed length"); | |
115 | goto error; | |
116 | } | |
117 | ||
118 | ret = lttng_rotate_session(attr, &handle); | |
119 | if (ret < 0) { | |
120 | switch (-ret) { | |
121 | case LTTNG_ERR_SESSION_NOT_STARTED: | |
122 | WARN("Tracing session %s not started yet", session_name); | |
123 | break; | |
124 | default: | |
125 | ERR("%s", lttng_strerror(ret)); | |
126 | break; | |
127 | } | |
128 | goto error; | |
129 | } | |
130 | ||
131 | if (!opt_no_wait) { | |
132 | _MSG("Waiting for rotation to complete"); | |
133 | ret = fflush(stdout); | |
134 | if (ret) { | |
135 | PERROR("fflush"); | |
136 | goto error; | |
137 | } | |
138 | ||
139 | do { | |
140 | rotation_status = lttng_rotation_handle_get_state(handle, | |
141 | &rotation_state); | |
142 | if (rotation_status != LTTNG_ROTATION_STATUS_OK) { | |
143 | ERR("Failed to query the state of the rotation"); | |
144 | goto error; | |
145 | } | |
146 | ||
147 | /* | |
148 | * Data sleep time before retrying (in usec). Don't | |
149 | * sleep if the call returned value indicates | |
150 | * availability. | |
151 | */ | |
152 | if (rotation_state == LTTNG_ROTATION_STATE_ONGOING) { | |
153 | ret = usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); | |
154 | if (ret) { | |
155 | PERROR("usleep"); | |
156 | goto error; | |
157 | } | |
158 | _MSG("."); | |
159 | ||
160 | ret = fflush(stdout); | |
161 | if (ret) { | |
162 | PERROR("fflush"); | |
163 | goto error; | |
164 | } | |
165 | } | |
166 | } while (rotation_state == LTTNG_ROTATION_STATE_ONGOING); | |
167 | MSG(""); | |
168 | } | |
169 | ||
170 | switch (rotation_state) { | |
171 | case LTTNG_ROTATION_STATE_COMPLETED: | |
172 | { | |
173 | const char *path; | |
174 | ||
175 | rotation_status = lttng_rotation_handle_get_completed_archive_location( | |
176 | handle, &path); | |
177 | if (rotation_status != LTTNG_ROTATION_STATUS_OK) { | |
178 | ERR("Failed to retrieve the rotation's completed chunk archive location"); | |
179 | goto error; | |
180 | } | |
181 | MSG("Trace chunk archive for session %s is now readable at %s", | |
182 | session_name, path); | |
183 | ret = mi_output_rotate("completed", path, session_name); | |
184 | if (ret) { | |
185 | goto error; | |
186 | } | |
187 | ret = CMD_SUCCESS; | |
188 | goto end; | |
189 | } | |
190 | case LTTNG_ROTATION_STATE_EXPIRED: | |
191 | MSG("Session %s rotated, but handle expired", session_name); | |
192 | ret = mi_output_rotate("expired", NULL, session_name); | |
193 | if (ret) { | |
194 | goto error; | |
195 | } | |
196 | ret = CMD_SUCCESS; | |
197 | goto end; | |
198 | default: | |
199 | ERR("Unexpected rotation state received, aborting..."); | |
200 | goto error; | |
201 | } | |
202 | ||
203 | error: | |
204 | ret = CMD_ERROR; | |
205 | end: | |
206 | lttng_rotation_handle_destroy(handle); | |
207 | lttng_rotation_immediate_attr_destroy(attr); | |
208 | return ret; | |
209 | } | |
210 | ||
211 | /* | |
212 | * cmd_rotate | |
213 | * | |
214 | * The 'rotate <options>' first level command | |
215 | */ | |
216 | int cmd_rotate(int argc, const char **argv) | |
217 | { | |
218 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; | |
219 | int popt_ret; | |
220 | static poptContext pc; | |
221 | char *session_name = NULL; | |
222 | bool free_session_name = false; | |
223 | ||
224 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
225 | popt_ret = poptReadDefaultConfig(pc, 0); | |
226 | if (popt_ret) { | |
227 | ret = CMD_ERROR; | |
228 | ERR("poptReadDefaultConfig"); | |
229 | goto end; | |
230 | } | |
231 | ||
232 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
233 | switch (opt) { | |
234 | case OPT_HELP: | |
235 | SHOW_HELP(); | |
236 | goto end; | |
237 | case OPT_LIST_OPTIONS: | |
238 | list_cmd_options(stdout, long_options); | |
239 | goto end; | |
240 | default: | |
241 | ret = CMD_UNDEFINED; | |
242 | goto end; | |
243 | } | |
244 | } | |
245 | ||
246 | opt_session_name = (char*) poptGetArg(pc); | |
247 | ||
248 | if (!opt_session_name) { | |
249 | session_name = get_session_name(); | |
250 | if (!session_name) { | |
251 | goto end; | |
252 | } | |
253 | free_session_name = true; | |
254 | } else { | |
255 | session_name = opt_session_name; | |
256 | } | |
257 | ||
258 | /* Mi check */ | |
259 | if (lttng_opt_mi) { | |
260 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
261 | if (!writer) { | |
262 | ret = -LTTNG_ERR_NOMEM; | |
263 | goto end; | |
264 | } | |
265 | ||
266 | /* Open rotate command */ | |
267 | ret = mi_lttng_writer_command_open(writer, | |
268 | mi_lttng_element_command_rotate); | |
269 | if (ret) { | |
270 | ret = CMD_ERROR; | |
271 | goto end; | |
272 | } | |
273 | ||
274 | /* Open output element */ | |
275 | ret = mi_lttng_writer_open_element(writer, | |
276 | mi_lttng_element_command_output); | |
277 | if (ret) { | |
278 | goto end; | |
279 | } | |
280 | ||
281 | /* Open rotations element */ | |
282 | ret = mi_lttng_writer_open_element(writer, | |
283 | mi_lttng_element_rotations); | |
284 | if (ret) { | |
285 | goto end; | |
286 | } | |
287 | ||
288 | } | |
289 | ||
290 | command_ret = rotate_tracing(session_name); | |
291 | if (command_ret) { | |
292 | success = 0; | |
293 | } | |
294 | ||
295 | /* Mi closing */ | |
296 | if (lttng_opt_mi) { | |
297 | /* Close rotations element */ | |
298 | ret = mi_lttng_writer_close_element(writer); | |
299 | if (ret) { | |
300 | goto end; | |
301 | } | |
302 | /* Close output element */ | |
303 | ret = mi_lttng_writer_close_element(writer); | |
304 | if (ret) { | |
305 | goto end; | |
306 | } | |
307 | /* Success ? */ | |
308 | ret = mi_lttng_writer_write_element_bool(writer, | |
309 | mi_lttng_element_command_success, success); | |
310 | if (ret) { | |
311 | ret = CMD_ERROR; | |
312 | goto end; | |
313 | } | |
314 | ||
315 | /* Command element close */ | |
316 | ret = mi_lttng_writer_command_close(writer); | |
317 | if (ret) { | |
318 | ret = CMD_ERROR; | |
319 | goto end; | |
320 | } | |
321 | } | |
322 | ||
323 | end: | |
324 | /* Mi clean-up */ | |
325 | if (writer && mi_lttng_writer_destroy(writer)) { | |
326 | /* Preserve original error code */ | |
327 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
328 | } | |
329 | ||
330 | /* Overwrite ret if an error occurred with start_tracing */ | |
331 | ret = command_ret ? command_ret : ret; | |
332 | poptFreeContext(pc); | |
333 | if (free_session_name) { | |
334 | free(session_name); | |
335 | } | |
336 | return ret; | |
337 | } |