1 /**
2 * collectd - src/tail_csv.c
3 * Copyright (C) 2013 Kris Nielander
4 * Copyright (C) 2013 Florian Forster
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 as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Kris Nielander <nielander at fox-it.com>
21 * Florian Forster <octo at collectd.org>
22 **/
24 #include "collectd.h"
25 #include "plugin.h" /* plugin_register_*, plugin_dispatch_values */
26 #include "common.h" /* auxiliary functions */
27 #include "utils_tail.h"
29 #include <sys/mman.h>
30 #include <sys/stat.h>
31 #include <fcntl.h>
32 #include <stdlib.h>
33 #include <string.h>
35 struct metric_definition_s {
36 char *name;
37 char *type;
38 char *instance;
39 int data_source_type;
40 int value_from;
41 struct metric_definition_s *next;
42 };
43 typedef struct metric_definition_s metric_definition_t;
45 struct instance_definition_s {
46 char *instance;
47 char *path;
48 cu_tail_t *tail;
49 metric_definition_t **metric_list;
50 size_t metric_list_len;
51 cdtime_t interval;
52 int time_from;
53 struct instance_definition_s *next;
54 };
55 typedef struct instance_definition_s instance_definition_t;
57 /* Private */
58 static metric_definition_t *metric_head = NULL;
60 static int tcsv_submit (instance_definition_t *id,
61 metric_definition_t *md,
62 value_t v, cdtime_t t)
63 {
64 /* Registration variables */
65 value_list_t vl = VALUE_LIST_INIT;
67 /* Register */
68 vl.values_len = 1;
69 vl.values = &v;
71 sstrncpy(vl.host, hostname_g, sizeof (vl.host));
72 sstrncpy(vl.plugin, "tail_csv", sizeof(vl.plugin));
73 if (id->instance != NULL)
74 sstrncpy(vl.plugin_instance, id->instance, sizeof(vl.plugin_instance));
75 sstrncpy(vl.type, md->type, sizeof(vl.type));
76 if (md->instance != NULL)
77 sstrncpy(vl.type_instance, md->instance, sizeof(vl.type_instance));
79 vl.time = t;
80 vl.interval = id->interval;
82 return (plugin_dispatch_values(&vl));
83 }
85 static cdtime_t parse_time (char const *tbuf)
86 {
87 double t;
88 char *endptr = 0;
90 errno = 0;
91 t = strtod (tbuf, &endptr);
92 if ((errno != 0) || (endptr == NULL) || (endptr[0] != 0))
93 return (cdtime ());
95 return (DOUBLE_TO_CDTIME_T (t));
96 }
98 static int tcsv_read_metric (instance_definition_t *id,
99 metric_definition_t *md,
100 char **fields, size_t fields_num)
101 {
102 value_t v;
103 cdtime_t t;
104 int status;
106 if (md->data_source_type == -1)
107 return (EINVAL);
109 if (md->value_from >= fields_num)
110 return (EINVAL);
112 if (id->time_from >= 0 && (id->time_from >= fields_num))
113 return (EINVAL);
115 t = 0;
116 if (id->time_from >= 0)
117 t = parse_time (fields[id->time_from]);
119 status = parse_value (fields[md->value_from], &v, md->data_source_type);
120 if (status != 0)
121 return (status);
123 return (tcsv_submit (id, md, v, t));
124 }
126 static _Bool tcsv_check_index (int index, size_t fields_num, char const *name)
127 {
128 if (index < 0)
129 return 1;
130 else if (((size_t) index) < fields_num)
131 return 1;
133 ERROR ("tail_csv plugin: Metric \"%s\": Request for index %i when "
134 "only %zu fields are available.",
135 name, index, fields_num);
136 return (0);
137 }
139 static int tcsv_read_buffer (instance_definition_t *id,
140 char *buffer, size_t buffer_size)
141 {
142 char **metrics;
143 size_t metrics_num;
145 char *ptr;
146 size_t i;
148 /* Remove newlines at the end of line. */
149 while (buffer_size > 0) {
150 if ((buffer[buffer_size - 1] == '\n')
151 || (buffer[buffer_size - 1] == '\r')) {
152 buffer[buffer_size - 1] = 0;
153 buffer_size--;
154 } else {
155 break;
156 }
157 }
159 /* Ignore empty lines. */
160 if ((buffer_size == 0) || (buffer[0] == '#'))
161 return (0);
163 /* Count the number of fields. */
164 metrics_num = 1;
165 for (i = 0; i < buffer_size; i++) {
166 if (buffer[i] == ',')
167 metrics_num++;
168 }
170 if (metrics_num == 1) {
171 ERROR("tail_csv plugin: last line of `%s' does not contain "
172 "enough values.", id->path);
173 return (-1);
174 }
176 /* Create a list of all values */
177 metrics = calloc (metrics_num, sizeof (*metrics));
178 if (metrics == NULL) {
179 ERROR ("tail_csv plugin: calloc failed.");
180 return (ENOMEM);
181 }
183 ptr = buffer;
184 metrics[0] = ptr;
185 i = 1;
186 for (ptr = buffer; *ptr != 0; ptr++) {
187 if (*ptr != ',')
188 continue;
190 *ptr = 0;
191 metrics[i] = ptr + 1;
192 i++;
193 }
194 assert (i == metrics_num);
196 /* Register values */
197 for (i = 0; i < id->metric_list_len; ++i){
198 metric_definition_t *md = id->metric_list[i];
200 if (!tcsv_check_index (md->value_from, metrics_num, md->name)
201 || !tcsv_check_index (id->time_from, metrics_num, md->name))
202 continue;
204 tcsv_read_metric (id, md, metrics, metrics_num);
205 }
207 /* Free up resources */
208 sfree (metrics);
209 return (0);
210 }
212 static int tcsv_read (user_data_t *ud) {
213 instance_definition_t *id;
214 id = ud->data;
216 if (id->tail == NULL)
217 {
218 id->tail = cu_tail_create (id->path);
219 if (id->tail == NULL)
220 {
221 ERROR ("tail_csv plugin: cu_tail_create (\"%s\") failed.",
222 id->path);
223 return (-1);
224 }
225 }
227 while (42)
228 {
229 char buffer[1024];
230 size_t buffer_len;
231 int status;
233 status = cu_tail_readline (id->tail, buffer, (int) sizeof (buffer));
234 if (status != 0)
235 {
236 ERROR ("tail_csv plugin: File \"%s\": cu_tail_readline failed "
237 "with status %i.", id->path, status);
238 return (-1);
239 }
241 buffer_len = strlen (buffer);
242 if (buffer_len == 0)
243 break;
245 tcsv_read_buffer (id, buffer, buffer_len);
246 }
248 return (0);
249 }
251 static void tcsv_metric_definition_destroy(void *arg){
252 metric_definition_t *md;
253 metric_definition_t *next;
255 md = arg;
256 if (md == NULL)
257 return;
259 next = md->next;
260 md->next = NULL;
262 sfree(md->name);
263 sfree(md->type);
264 sfree(md->instance);
265 sfree(md);
267 tcsv_metric_definition_destroy (next);
268 }
270 static int tcsv_config_get_index(oconfig_item_t *ci, int *ret_index) {
271 int index;
273 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_NUMBER)){
274 WARNING("tail_csv plugin: The \"%s\" config option needs exactly one "
275 "integer argument.", ci->key);
276 return (-1);
277 }
279 index = (int) ci->values[0].value.number;
280 if (index < 0) {
281 WARNING("tail_csv plugin: The \"%s\" config option must be positive "
282 "(or zero).", ci->key);
283 return (-1);
284 }
286 *ret_index = index;
287 return (0);
288 }
290 /* Parse metric */
291 static int tcsv_config_add_metric(oconfig_item_t *ci){
292 metric_definition_t *md;
293 int status = 0;
294 int i;
296 md = (metric_definition_t *)malloc(sizeof(*md));
297 if (md == NULL)
298 return (-1);
299 memset(md, 0, sizeof(*md));
300 md->name = NULL;
301 md->type = NULL;
302 md->instance = NULL;
303 md->data_source_type = -1;
304 md->value_from = -1;
305 md->next = NULL;
307 status = cf_util_get_string (ci, &md->name);
308 if (status != 0) {
309 sfree (md);
310 return (-1);
311 }
313 for (i = 0; i < ci->children_num; ++i){
314 oconfig_item_t *option = ci->children + i;
316 if (strcasecmp("Type", option->key) == 0)
317 status = cf_util_get_string(option, &md->type);
318 else if (strcasecmp("Instance", option->key) == 0)
319 status = cf_util_get_string(option, &md->instance);
320 else if (strcasecmp("ValueFrom", option->key) == 0)
321 status = tcsv_config_get_index (option, &md->value_from);
322 else {
323 WARNING("tail_csv plugin: Option `%s' not allowed here.", option->key);
324 status = -1;
325 }
327 if (status != 0)
328 break;
329 }
331 if (status != 0){
332 tcsv_metric_definition_destroy(md);
333 return (-1);
334 }
336 /* Verify all necessary options have been set. */
337 if (md->type == NULL) {
338 WARNING("tail_csv plugin: Option `Type' must be set.");
339 status = -1;
340 } else if (md->value_from < 0) {
341 WARNING("tail_csv plugin: Option `ValueFrom' must be set.");
342 status = -1;
343 }
344 if (status != 0) {
345 tcsv_metric_definition_destroy(md);
346 return (status);
347 }
349 if (metric_head == NULL)
350 metric_head = md;
351 else {
352 metric_definition_t *last;
353 last = metric_head;
354 while (last->next != NULL)
355 last = last->next;
356 last->next = md;
357 }
359 return (0);
360 }
362 static void tcsv_instance_definition_destroy(void *arg){
363 instance_definition_t *id;
365 id = arg;
366 if (id == NULL)
367 return;
369 if (id->tail != NULL)
370 cu_tail_destroy (id->tail);
371 id->tail = NULL;
373 sfree(id->instance);
374 sfree(id->path);
375 sfree(id->metric_list);
376 sfree(id);
377 }
379 static int tcsv_config_add_instance_collect(instance_definition_t *id, oconfig_item_t *ci) {
380 metric_definition_t *metric;
381 metric_definition_t **metric_list;
382 size_t metric_list_size;
383 int i;
385 if (ci->values_num < 1) {
386 WARNING("tail_csv plugin: The `Collect' config option needs at least one argument.");
387 return (-1);
388 }
390 metric_list_size = id->metric_list_len + (size_t) ci->values_num;
391 metric_list = realloc (id->metric_list, sizeof (*id->metric_list) * metric_list_size);
392 if (metric_list == NULL)
393 return (-1);
394 id->metric_list = metric_list;
396 for (i = 0; i < ci->values_num; i++) {
397 char *metric_name;
399 if (ci->values[i].type != OCONFIG_TYPE_STRING) {
400 WARNING("tail_csv plugin: All arguments to `Collect' must be strings.");
401 continue;
402 }
403 metric_name = ci->values[i].value.string;
405 for (metric = metric_head; metric != NULL; metric = metric->next)
406 if (strcasecmp(metric_name, metric->name) == 0)
407 break;
409 if (metric == NULL) {
410 WARNING ("tail_csv plugin: `Collect' argument not found `%s'.", metric_name);
411 continue;
412 }
414 id->metric_list[id->metric_list_len] = metric;
415 id->metric_list_len++;
416 }
418 return (0);
419 }
421 /* <File /> block */
422 static int tcsv_config_add_file(oconfig_item_t *ci)
423 {
424 instance_definition_t* id;
425 int status = 0;
426 int i;
428 /* Registration variables */
429 char cb_name[DATA_MAX_NAME_LEN];
430 user_data_t cb_data;
431 struct timespec cb_interval;
433 id = malloc(sizeof(*id));
434 if (id == NULL)
435 return (-1);
436 memset(id, 0, sizeof(*id));
437 id->instance = NULL;
438 id->path = NULL;
439 id->metric_list = NULL;
440 id->time_from = -1;
441 id->next = NULL;
443 status = cf_util_get_string (ci, &id->path);
444 if (status != 0) {
445 sfree (id);
446 return (status);
447 }
449 /* Use default interval. */
450 id->interval = plugin_get_interval();
452 for (i = 0; i < ci->children_num; ++i){
453 oconfig_item_t *option = ci->children + i;
454 status = 0;
456 if (strcasecmp("Instance", option->key) == 0)
457 status = cf_util_get_string(option, &id->instance);
458 else if (strcasecmp("Collect", option->key) == 0)
459 status = tcsv_config_add_instance_collect(id, option);
460 else if (strcasecmp("Interval", option->key) == 0)
461 cf_util_get_cdtime(option, &id->interval);
462 else if (strcasecmp("TimeFrom", option->key) == 0)
463 status = tcsv_config_get_index (option, &id->time_from);
464 else {
465 WARNING("tail_csv plugin: Option `%s' not allowed here.", option->key);
466 status = -1;
467 }
469 if (status != 0)
470 break;
471 }
473 if (status != 0){
474 tcsv_instance_definition_destroy(id);
475 return (-1);
476 }
478 /* Verify all necessary options have been set. */
479 if (id->path == NULL){
480 WARNING("tail_csv plugin: Option `Path' must be set.");
481 status = -1;
482 } else if (id->metric_list == NULL){
483 WARNING("tail_csv plugin: Option `Collect' must be set.");
484 status = -1;
485 }
487 if (status != 0){
488 tcsv_instance_definition_destroy(id);
489 return (-1);
490 }
492 ssnprintf (cb_name, sizeof (cb_name), "tail_csv/%s", id->path);
493 memset(&cb_data, 0, sizeof(cb_data));
494 cb_data.data = id;
495 cb_data.free_func = tcsv_instance_definition_destroy;
496 CDTIME_T_TO_TIMESPEC(id->interval, &cb_interval);
497 status = plugin_register_complex_read(NULL, cb_name, tcsv_read, &cb_interval, &cb_data);
499 if (status != 0){
500 ERROR("tail_csv plugin: Registering complex read function failed.");
501 tcsv_instance_definition_destroy(id);
502 return (-1);
503 }
505 return (0);
506 }
508 /* Parse blocks */
509 static int tcsv_config(oconfig_item_t *ci){
510 int i;
511 for (i = 0; i < ci->children_num; ++i){
512 oconfig_item_t *child = ci->children + i;
513 if (strcasecmp("Metric", child->key) == 0)
514 tcsv_config_add_metric(child);
515 else if (strcasecmp("File", child->key) == 0)
516 tcsv_config_add_file(child);
517 else
518 WARNING("tail_csv plugin: Ignore unknown config option `%s'.", child->key);
519 }
521 return (0);
522 } /* int tcsv_config */
524 static int tcsv_init(void) { /* {{{ */
525 static _Bool have_init = 0;
526 metric_definition_t *md;
528 if (have_init)
529 return (0);
531 for (md = metric_head; md != NULL; md = md->next) {
532 data_set_t const *ds;
534 /* Retrieve the data source type from the types db. */
535 ds = plugin_get_ds(md->type);
536 if (ds == NULL)
537 {
538 ERROR ("tail_csv plugin: Failed to look up type \"%s\" for "
539 "metric \"%s\". It may not be defined in the types.db "
540 "file. Please read the types.db(5) manual page for more "
541 "details.",
542 md->type, md->name);
543 continue;
544 }
545 else if (ds->ds_num != 1)
546 {
547 ERROR ("tail_csv plugin: The type \"%s\" has %i data sources. "
548 "Only types with a single data soure are supported.",
549 ds->type, ds->ds_num);
550 continue;
551 }
553 md->data_source_type = ds->ds->type;
554 }
556 return (0);
557 } /* }}} int tcsv_init */
559 static int tcsv_shutdown (void) {
560 tcsv_metric_definition_destroy (metric_head);
561 metric_head = NULL;
563 return (0);
564 }
566 void module_register(void){
567 plugin_register_complex_config("tail_csv", tcsv_config);
568 plugin_register_init("tail_csv", tcsv_init);
569 plugin_register_shutdown("tail_csv", tcsv_shutdown);
570 }
572 /* vim: set sw=4 sts=4 et : */