1 /**
2 * collectd - src/table.c
3 * Copyright (C) 2009 Sebastian Harl
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Sebastian Harl <sh at tokkee.org>
25 **/
27 /*
28 * This module provides generic means to parse and dispatch tabular data.
29 */
31 #include "collectd.h"
32 #include "common.h"
34 #include "configfile.h"
35 #include "plugin.h"
37 #define log_err(...) ERROR ("table plugin: " __VA_ARGS__)
38 #define log_warn(...) WARNING ("table plugin: " __VA_ARGS__)
40 /*
41 * private data types
42 */
44 typedef struct {
45 char *type;
46 char *instance_prefix;
47 size_t *instances;
48 size_t instances_num;
49 size_t *values;
50 size_t values_num;
52 const data_set_t *ds;
53 } tbl_result_t;
55 typedef struct {
56 char *file;
57 char *sep;
58 char *instance;
60 tbl_result_t *results;
61 size_t results_num;
63 size_t max_colnum;
64 } tbl_t;
66 static void tbl_result_setup (tbl_result_t *res)
67 {
68 res->type = NULL;
70 res->instance_prefix = NULL;
71 res->instances = NULL;
72 res->instances_num = 0;
74 res->values = NULL;
75 res->values_num = 0;
77 res->ds = NULL;
78 } /* tbl_result_setup */
80 static void tbl_result_clear (tbl_result_t *res)
81 {
82 sfree (res->type);
84 sfree (res->instance_prefix);
85 sfree (res->instances);
86 res->instances_num = 0;
88 sfree (res->values);
89 res->values_num = 0;
91 res->ds = NULL;
92 } /* tbl_result_clear */
94 static void tbl_setup (tbl_t *tbl, char *file)
95 {
96 tbl->file = sstrdup (file);
97 tbl->sep = NULL;
98 tbl->instance = NULL;
100 tbl->results = NULL;
101 tbl->results_num = 0;
103 tbl->max_colnum = 0;
104 } /* tbl_setup */
106 static void tbl_clear (tbl_t *tbl)
107 {
108 size_t i;
110 sfree (tbl->file);
111 sfree (tbl->sep);
112 sfree (tbl->instance);
114 for (i = 0; i < tbl->results_num; ++i)
115 tbl_result_clear (tbl->results + i);
116 sfree (tbl->results);
117 tbl->results_num = 0;
119 tbl->max_colnum = 0;
120 } /* tbl_clear */
122 static tbl_t *tables;
123 static size_t tables_num;
125 /*
126 * configuration handling
127 */
129 static int tbl_config_set_s (char *name, char **var, oconfig_item_t *ci)
130 {
131 if ((1 != ci->values_num)
132 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
133 log_err ("\"%s\" expects a single string argument.", name);
134 return 1;
135 }
137 sfree (*var);
138 *var = sstrdup (ci->values[0].value.string);
139 return 0;
140 } /* tbl_config_set_separator */
142 static int tbl_config_append_array_i (char *name, size_t **var, size_t *len,
143 oconfig_item_t *ci)
144 {
145 size_t *tmp;
146 size_t num;
147 size_t i;
149 if (1 > ci->values_num) {
150 log_err ("\"%s\" expects at least one argument.", name);
151 return 1;
152 }
154 num = (size_t) ci->values_num;
155 for (i = 0; i < num; ++i) {
156 if (OCONFIG_TYPE_NUMBER != ci->values[i].type) {
157 log_err ("\"%s\" expects numerical arguments only.", name);
158 return 1;
159 }
160 }
162 tmp = realloc (*var, ((*len) + num) * sizeof (**var));
163 if (NULL == tmp) {
164 char errbuf[1024];
165 log_err ("realloc failed: %s.",
166 sstrerror (errno, errbuf, sizeof (errbuf)));
167 return -1;
168 }
169 *var = tmp;
171 for (i = 0; i < num; ++i) {
172 (*var)[*len] = (size_t) ci->values[i].value.number;
173 (*len)++;
174 }
176 return 0;
177 } /* tbl_config_append_array_s */
179 static int tbl_config_result (tbl_t *tbl, oconfig_item_t *ci)
180 {
181 tbl_result_t *res;
183 int status = 0;
184 int i;
186 if (0 != ci->values_num) {
187 log_err ("<Result> does not expect any arguments.");
188 return 1;
189 }
191 res = (tbl_result_t *)realloc (tbl->results,
192 (tbl->results_num + 1) * sizeof (*tbl->results));
193 if (res == NULL) {
194 char errbuf[1024];
195 log_err ("realloc failed: %s.",
196 sstrerror (errno, errbuf, sizeof (errbuf)));
197 return -1;
198 }
200 tbl->results = res;
201 ++tbl->results_num;
203 res = tbl->results + tbl->results_num - 1;
204 tbl_result_setup (res);
206 for (i = 0; i < ci->children_num; ++i) {
207 oconfig_item_t *c = ci->children + i;
209 if (0 == strcasecmp (c->key, "Type"))
210 tbl_config_set_s (c->key, &res->type, c);
211 else if (0 == strcasecmp (c->key, "InstancePrefix"))
212 tbl_config_set_s (c->key, &res->instance_prefix, c);
213 else if (0 == strcasecmp (c->key, "InstancesFrom"))
214 tbl_config_append_array_i (c->key,
215 &res->instances, &res->instances_num, c);
216 else if (0 == strcasecmp (c->key, "ValuesFrom"))
217 tbl_config_append_array_i (c->key,
218 &res->values, &res->values_num, c);
219 else
220 log_warn ("Ignoring unknown config key \"%s\" "
221 " in <Result>.", c->key);
222 }
224 if (NULL == res->type) {
225 log_err ("No \"Type\" option specified for <Result> "
226 "in table \"%s\".", tbl->file);
227 status = 1;
228 }
230 if (NULL == res->values) {
231 log_err ("No \"ValuesFrom\" option specified for <Result> "
232 "in table \"%s\".", tbl->file);
233 status = 1;
234 }
236 if (0 != status) {
237 tbl_result_clear (res);
238 --tbl->results_num;
239 return status;
240 }
241 return 0;
242 } /* tbl_config_result */
244 static int tbl_config_table (oconfig_item_t *ci)
245 {
246 tbl_t *tbl;
248 int status = 0;
249 size_t i;
251 if ((1 != ci->values_num)
252 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
253 log_err ("<Table> expects a single string argument.");
254 return 1;
255 }
257 tbl = (tbl_t *)realloc (tables, (tables_num + 1) * sizeof (*tables));
258 if (NULL == tbl) {
259 char errbuf[1024];
260 log_err ("realloc failed: %s.",
261 sstrerror (errno, errbuf, sizeof (errbuf)));
262 return -1;
263 }
265 tables = tbl;
266 ++tables_num;
268 tbl = tables + tables_num - 1;
269 tbl_setup (tbl, ci->values[0].value.string);
271 for (i = 0; i < ((size_t) ci->children_num); ++i) {
272 oconfig_item_t *c = ci->children + i;
274 if (0 == strcasecmp (c->key, "Separator"))
275 tbl_config_set_s (c->key, &tbl->sep, c);
276 else if (0 == strcasecmp (c->key, "Instance"))
277 tbl_config_set_s (c->key, &tbl->instance, c);
278 else if (0 == strcasecmp (c->key, "Result"))
279 tbl_config_result (tbl, c);
280 else
281 log_warn ("Ignoring unknown config key \"%s\" "
282 "in <Table %s>.", c->key, tbl->file);
283 }
285 if (NULL == tbl->sep) {
286 log_err ("Table \"%s\" does not specify any separator.", tbl->file);
287 status = 1;
288 } else {
289 strunescape (tbl->sep, strlen (tbl->sep) + 1);
290 }
292 if (NULL == tbl->instance) {
293 tbl->instance = sstrdup (tbl->file);
294 replace_special (tbl->instance, strlen (tbl->instance));
295 }
297 if (NULL == tbl->results) {
298 log_err ("Table \"%s\" does not specify any (valid) results.",
299 tbl->file);
300 status = 1;
301 }
303 if (0 != status) {
304 tbl_clear (tbl);
305 --tables_num;
306 return status;
307 }
309 for (i = 0; i < tbl->results_num; ++i) {
310 tbl_result_t *res = tbl->results + i;
311 size_t j;
313 for (j = 0; j < res->instances_num; ++j)
314 if (res->instances[j] > tbl->max_colnum)
315 tbl->max_colnum = res->instances[j];
317 for (j = 0; j < res->values_num; ++j)
318 if (res->values[j] > tbl->max_colnum)
319 tbl->max_colnum = res->values[j];
320 }
321 return 0;
322 } /* tbl_config_table */
324 static int tbl_config (oconfig_item_t *ci)
325 {
326 int i;
328 for (i = 0; i < ci->children_num; ++i) {
329 oconfig_item_t *c = ci->children + i;
331 if (0 == strcasecmp (c->key, "Table"))
332 tbl_config_table (c);
333 else
334 log_warn ("Ignoring unknown config key \"%s\".", c->key);
335 }
336 return 0;
337 } /* tbl_config */
339 /*
340 * result handling
341 */
343 static int tbl_prepare (tbl_t *tbl)
344 {
345 size_t i;
347 for (i = 0; i < tbl->results_num; ++i) {
348 tbl_result_t *res = tbl->results + i;
350 res->ds = plugin_get_ds (res->type);
351 if (NULL == res->ds) {
352 log_err ("Unknown type \"%s\". See types.db(5) for details.",
353 res->type);
354 return -1;
355 }
357 if (res->values_num != res->ds->ds_num) {
358 log_err ("Invalid type \"%s\". Expected %zu data source%s, "
359 "got %zu.", res->type, res->values_num,
360 (1 == res->values_num) ? "" : "s",
361 res->ds->ds_num);
362 return -1;
363 }
364 }
365 return 0;
366 } /* tbl_prepare */
368 static int tbl_finish (tbl_t *tbl)
369 {
370 size_t i;
372 for (i = 0; i < tbl->results_num; ++i)
373 tbl->results[i].ds = NULL;
374 return 0;
375 } /* tbl_finish */
377 static int tbl_result_dispatch (tbl_t *tbl, tbl_result_t *res,
378 char **fields, size_t fields_num)
379 {
380 value_list_t vl = VALUE_LIST_INIT;
381 value_t values[res->values_num];
383 size_t i;
385 assert (NULL != res->ds);
386 assert (res->values_num == res->ds->ds_num);
388 for (i = 0; i < res->values_num; ++i) {
389 char *value;
391 assert (res->values[i] < fields_num);
392 value = fields[res->values[i]];
394 if (0 != parse_value (value, &values[i], res->ds->ds[i].type))
395 return -1;
396 }
398 vl.values = values;
399 vl.values_len = STATIC_ARRAY_SIZE (values);
401 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
402 sstrncpy (vl.plugin, "table", sizeof (vl.plugin));
403 sstrncpy (vl.plugin_instance, tbl->instance, sizeof (vl.plugin_instance));
404 sstrncpy (vl.type, res->type, sizeof (vl.type));
406 if (0 == res->instances_num) {
407 if (NULL != res->instance_prefix)
408 sstrncpy (vl.type_instance, res->instance_prefix,
409 sizeof (vl.type_instance));
410 }
411 else {
412 char *instances[res->instances_num];
413 char instances_str[DATA_MAX_NAME_LEN];
415 for (i = 0; i < res->instances_num; ++i) {
416 assert (res->instances[i] < fields_num);
417 instances[i] = fields[res->instances[i]];
418 }
420 strjoin (instances_str, sizeof (instances_str),
421 instances, STATIC_ARRAY_SIZE (instances), "-");
422 instances_str[sizeof (instances_str) - 1] = '\0';
424 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
425 if (NULL == res->instance_prefix)
426 strncpy (vl.type_instance, instances_str,
427 sizeof (vl.type_instance));
428 else
429 snprintf (vl.type_instance, sizeof (vl.type_instance),
430 "%s-%s", res->instance_prefix, instances_str);
432 if ('\0' != vl.type_instance[sizeof (vl.type_instance) - 1]) {
433 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
434 log_warn ("Truncated type instance: %s.", vl.type_instance);
435 }
436 }
438 plugin_dispatch_values (&vl);
439 return 0;
440 } /* tbl_result_dispatch */
442 static int tbl_parse_line (tbl_t *tbl, char *line, size_t len)
443 {
444 char *fields[tbl->max_colnum + 1];
445 char *ptr, *saveptr;
447 size_t i;
449 i = 0;
450 ptr = line;
451 saveptr = NULL;
452 while (NULL != (fields[i] = strtok_r (ptr, tbl->sep, &saveptr))) {
453 ptr = NULL;
454 ++i;
456 if (i > tbl->max_colnum)
457 break;
458 }
460 if (i <= tbl->max_colnum) {
461 log_warn ("Not enough columns in line "
462 "(expected at least %zu, got %zu).",
463 tbl->max_colnum + 1, i);
464 return -1;
465 }
467 for (i = 0; i < tbl->results_num; ++i)
468 if (0 != tbl_result_dispatch (tbl, tbl->results + i,
469 fields, STATIC_ARRAY_SIZE (fields))) {
470 log_err ("Failed to dispatch result.");
471 continue;
472 }
473 return 0;
474 } /* tbl_parse_line */
476 static int tbl_read_table (tbl_t *tbl)
477 {
478 FILE *fh;
479 char buf[4096];
481 fh = fopen (tbl->file, "r");
482 if (NULL == fh) {
483 char errbuf[1024];
484 log_err ("Failed to open file \"%s\": %s.", tbl->file,
485 sstrerror (errno, errbuf, sizeof (errbuf)));
486 return -1;
487 }
489 buf[sizeof (buf) - 1] = '\0';
490 while (NULL != fgets (buf, sizeof (buf), fh)) {
491 if ('\0' != buf[sizeof (buf) - 1]) {
492 buf[sizeof (buf) - 1] = '\0';
493 log_warn ("Table %s: Truncated line: %s", tbl->file, buf);
494 }
496 if (0 != tbl_parse_line (tbl, buf, sizeof (buf))) {
497 log_warn ("Table %s: Failed to parse line: %s", tbl->file, buf);
498 continue;
499 }
500 }
502 if (0 != ferror (fh)) {
503 char errbuf[1024];
504 log_err ("Failed to read from file \"%s\": %s.", tbl->file,
505 sstrerror (errno, errbuf, sizeof (errbuf)));
506 fclose (fh);
507 return -1;
508 }
510 fclose (fh);
511 return 0;
512 } /* tbl_read_table */
514 /*
515 * collectd callbacks
516 */
518 static int tbl_read (void)
519 {
520 int status = -1;
521 size_t i;
523 if (0 == tables_num)
524 return 0;
526 for (i = 0; i < tables_num; ++i) {
527 tbl_t *tbl = tables + i;
529 if (0 != tbl_prepare (tbl)) {
530 log_err ("Failed to prepare and parse table \"%s\".", tbl->file);
531 continue;
532 }
534 if (0 == tbl_read_table (tbl))
535 status = 0;
537 tbl_finish (tbl);
538 }
539 return status;
540 } /* tbl_read */
542 static int tbl_shutdown (void)
543 {
544 size_t i;
546 for (i = 0; i < tables_num; ++i)
547 tbl_clear (&tables[i]);
548 sfree (tables);
549 return 0;
550 } /* tbl_shutdown */
552 static int tbl_init (void)
553 {
554 if (0 == tables_num)
555 return 0;
557 plugin_register_read ("table", tbl_read);
558 plugin_register_shutdown ("table", tbl_shutdown);
559 return 0;
560 } /* tbl_init */
562 void module_register (void)
563 {
564 plugin_register_complex_config ("table", tbl_config);
565 plugin_register_init ("table", tbl_init);
566 } /* module_register */
568 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */