1 /**
2 * collectd - src/dbi.c
3 * Copyright (C) 2008-2015 Florian octo Forster
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 * Florian octo Forster <octo at collectd.org>
25 **/
27 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
31 #include "utils_db_query.h"
33 #include <dbi/dbi.h>
35 /* libdbi 0.9.0 introduced a new thread-safe interface and marked the old
36 * functions "deprecated". These macros convert the new functions to their old
37 * counterparts for backwards compatibility. */
38 #if !defined(LIBDBI_VERSION) || (LIBDBI_VERSION < 900)
39 #define HAVE_LEGACY_LIBDBI 1
40 #define dbi_initialize_r(a, inst) dbi_initialize(a)
41 #define dbi_shutdown_r(inst) dbi_shutdown()
42 #define dbi_set_verbosity_r(a, inst) dbi_set_verbosity(a)
43 #define dbi_driver_list_r(a, inst) dbi_driver_list(a)
44 #define dbi_driver_open_r(a, inst) dbi_driver_open(a)
45 #endif
47 /*
48 * Data types
49 */
50 struct cdbi_driver_option_s /* {{{ */
51 {
52 char *key;
53 union {
54 char *string;
55 int numeric;
56 } value;
57 _Bool is_numeric;
58 };
59 typedef struct cdbi_driver_option_s cdbi_driver_option_t; /* }}} */
61 struct cdbi_database_s /* {{{ */
62 {
63 char *name;
64 char *select_db;
66 cdtime_t interval;
68 char *driver;
69 char *host;
70 cdbi_driver_option_t *driver_options;
71 size_t driver_options_num;
73 udb_query_preparation_area_t **q_prep_areas;
74 udb_query_t **queries;
75 size_t queries_num;
77 dbi_conn connection;
78 };
79 typedef struct cdbi_database_s cdbi_database_t; /* }}} */
81 /*
82 * Global variables
83 */
84 #if !defined(HAVE_LEGACY_LIBDBI) || !HAVE_LEGACY_LIBDBI
85 static dbi_inst dbi_instance = 0;
86 #endif
87 static udb_query_t **queries = NULL;
88 static size_t queries_num = 0;
89 static cdbi_database_t **databases = NULL;
90 static size_t databases_num = 0;
92 static int cdbi_read_database(user_data_t *ud);
94 /*
95 * Functions
96 */
97 static const char *cdbi_strerror(dbi_conn conn, /* {{{ */
98 char *buffer, size_t buffer_size) {
99 const char *msg;
100 int status;
102 if (conn == NULL) {
103 sstrncpy(buffer, "connection is NULL", buffer_size);
104 return (buffer);
105 }
107 msg = NULL;
108 status = dbi_conn_error(conn, &msg);
109 if ((status >= 0) && (msg != NULL))
110 ssnprintf(buffer, buffer_size, "%s (status %i)", msg, status);
111 else
112 ssnprintf(buffer, buffer_size, "dbi_conn_error failed with status %i",
113 status);
115 return (buffer);
116 } /* }}} const char *cdbi_conn_error */
118 static int cdbi_result_get_field(dbi_result res, /* {{{ */
119 unsigned int index, char *buffer,
120 size_t buffer_size) {
121 unsigned short src_type;
123 src_type = dbi_result_get_field_type_idx(res, index);
124 if (src_type == DBI_TYPE_ERROR) {
125 ERROR("dbi plugin: cdbi_result_get: "
126 "dbi_result_get_field_type_idx failed.");
127 return (-1);
128 }
130 if (src_type == DBI_TYPE_INTEGER) {
131 long long value;
133 value = dbi_result_get_longlong_idx(res, index);
134 ssnprintf(buffer, buffer_size, "%lli", value);
135 } else if (src_type == DBI_TYPE_DECIMAL) {
136 double value;
138 value = dbi_result_get_double_idx(res, index);
139 ssnprintf(buffer, buffer_size, "%63.15g", value);
140 } else if (src_type == DBI_TYPE_STRING) {
141 const char *value;
143 value = dbi_result_get_string_idx(res, index);
144 if (value == NULL)
145 sstrncpy(buffer, "", buffer_size);
146 else if (strcmp("ERROR", value) == 0)
147 return (-1);
148 else
149 sstrncpy(buffer, value, buffer_size);
150 }
151 /* DBI_TYPE_BINARY */
152 /* DBI_TYPE_DATETIME */
153 else {
154 const char *field_name;
156 field_name = dbi_result_get_field_name(res, index);
157 if (field_name == NULL)
158 field_name = "<unknown>";
160 ERROR("dbi plugin: Column `%s': Don't know how to handle "
161 "source type %hu.",
162 field_name, src_type);
163 return (-1);
164 }
166 return (0);
167 } /* }}} int cdbi_result_get_field */
169 static void cdbi_database_free(cdbi_database_t *db) /* {{{ */
170 {
171 if (db == NULL)
172 return;
174 sfree(db->name);
175 sfree(db->driver);
177 for (size_t i = 0; i < db->driver_options_num; i++) {
178 sfree(db->driver_options[i].key);
179 if (!db->driver_options[i].is_numeric)
180 sfree(db->driver_options[i].value.string);
181 }
182 sfree(db->driver_options);
184 if (db->q_prep_areas)
185 for (size_t i = 0; i < db->queries_num; ++i)
186 udb_query_delete_preparation_area(db->q_prep_areas[i]);
187 free(db->q_prep_areas);
189 sfree(db);
190 } /* }}} void cdbi_database_free */
192 /* Configuration handling functions {{{
193 *
194 * <Plugin dbi>
195 * <Query "plugin_instance0">
196 * Statement "SELECT name, value FROM table"
197 * <Result>
198 * Type "gauge"
199 * InstancesFrom "name"
200 * ValuesFrom "value"
201 * </Result>
202 * ...
203 * </Query>
204 *
205 * <Database "plugin_instance1">
206 * Driver "mysql"
207 * Interval 120
208 * DriverOption "hostname" "localhost"
209 * ...
210 * Query "plugin_instance0"
211 * </Database>
212 * </Plugin>
213 */
215 static int cdbi_config_add_database_driver_option(cdbi_database_t *db, /* {{{ */
216 oconfig_item_t *ci) {
217 cdbi_driver_option_t *option;
219 if ((ci->values_num != 2) || (ci->values[0].type != OCONFIG_TYPE_STRING) ||
220 ((ci->values[1].type != OCONFIG_TYPE_STRING) &&
221 (ci->values[1].type != OCONFIG_TYPE_NUMBER))) {
222 WARNING("dbi plugin: The `DriverOption' config option "
223 "needs exactly two arguments.");
224 return (-1);
225 }
227 option = realloc(db->driver_options,
228 sizeof(*option) * (db->driver_options_num + 1));
229 if (option == NULL) {
230 ERROR("dbi plugin: realloc failed");
231 return (-1);
232 }
234 db->driver_options = option;
235 option = db->driver_options + db->driver_options_num;
236 memset(option, 0, sizeof(*option));
238 option->key = strdup(ci->values[0].value.string);
239 if (option->key == NULL) {
240 ERROR("dbi plugin: strdup failed.");
241 return (-1);
242 }
244 if (ci->values[1].type == OCONFIG_TYPE_STRING) {
245 option->value.string = strdup(ci->values[1].value.string);
246 if (option->value.string == NULL) {
247 ERROR("dbi plugin: strdup failed.");
248 sfree(option->key);
249 return (-1);
250 }
251 } else {
252 assert(ci->values[1].type == OCONFIG_TYPE_NUMBER);
253 option->value.numeric = (int)(ci->values[1].value.number + .5);
254 option->is_numeric = 1;
255 }
257 db->driver_options_num++;
258 return (0);
259 } /* }}} int cdbi_config_add_database_driver_option */
261 static int cdbi_config_add_database(oconfig_item_t *ci) /* {{{ */
262 {
263 cdbi_database_t *db;
264 int status;
266 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING)) {
267 WARNING("dbi plugin: The `Database' block "
268 "needs exactly one string argument.");
269 return (-1);
270 }
272 db = calloc(1, sizeof(*db));
273 if (db == NULL) {
274 ERROR("dbi plugin: calloc failed.");
275 return (-1);
276 }
278 status = cf_util_get_string(ci, &db->name);
279 if (status != 0) {
280 sfree(db);
281 return (status);
282 }
284 /* Fill the `cdbi_database_t' structure.. */
285 for (int i = 0; i < ci->children_num; i++) {
286 oconfig_item_t *child = ci->children + i;
288 if (strcasecmp("Driver", child->key) == 0)
289 status = cf_util_get_string(child, &db->driver);
290 else if (strcasecmp("DriverOption", child->key) == 0)
291 status = cdbi_config_add_database_driver_option(db, child);
292 else if (strcasecmp("SelectDB", child->key) == 0)
293 status = cf_util_get_string(child, &db->select_db);
294 else if (strcasecmp("Query", child->key) == 0)
295 status = udb_query_pick_from_list(child, queries, queries_num,
296 &db->queries, &db->queries_num);
297 else if (strcasecmp("Host", child->key) == 0)
298 status = cf_util_get_string(child, &db->host);
299 else if (strcasecmp("Interval", child->key) == 0)
300 status = cf_util_get_cdtime(child, &db->interval);
301 else {
302 WARNING("dbi plugin: Option `%s' not allowed here.", child->key);
303 status = -1;
304 }
306 if (status != 0)
307 break;
308 }
310 /* Check that all necessary options have been given. */
311 while (status == 0) {
312 if (db->driver == NULL) {
313 WARNING("dbi plugin: `Driver' not given for database `%s'", db->name);
314 status = -1;
315 }
316 if (db->driver_options_num == 0) {
317 WARNING("dbi plugin: No `DriverOption' given for database `%s'. "
318 "This will likely not work.",
319 db->name);
320 }
322 break;
323 } /* while (status == 0) */
325 while ((status == 0) && (db->queries_num > 0)) {
326 db->q_prep_areas = calloc(db->queries_num, sizeof(*db->q_prep_areas));
327 if (db->q_prep_areas == NULL) {
328 WARNING("dbi plugin: calloc failed");
329 status = -1;
330 break;
331 }
333 for (size_t i = 0; i < db->queries_num; ++i) {
334 db->q_prep_areas[i] = udb_query_allocate_preparation_area(db->queries[i]);
336 if (db->q_prep_areas[i] == NULL) {
337 WARNING("dbi plugin: udb_query_allocate_preparation_area failed");
338 status = -1;
339 break;
340 }
341 }
343 break;
344 }
346 /* If all went well, add this database to the global list of databases. */
347 if (status == 0) {
348 cdbi_database_t **temp;
350 temp = realloc(databases, sizeof(*databases) * (databases_num + 1));
351 if (temp == NULL) {
352 ERROR("dbi plugin: realloc failed");
353 status = -1;
354 } else {
355 databases = temp;
356 databases[databases_num] = db;
357 databases_num++;
359 char *name = ssnprintf_alloc("dbi:%s", db->name);
360 plugin_register_complex_read(
361 /* group = */ NULL,
362 /* name = */ name ? name : db->name,
363 /* callback = */ cdbi_read_database,
364 /* interval = */ (db->interval > 0) ? db->interval : 0,
365 &(user_data_t){
366 .data = db,
367 });
368 sfree(name);
369 }
370 }
372 if (status != 0) {
373 cdbi_database_free(db);
374 return (-1);
375 }
377 return (0);
378 } /* }}} int cdbi_config_add_database */
380 static int cdbi_config(oconfig_item_t *ci) /* {{{ */
381 {
382 for (int i = 0; i < ci->children_num; i++) {
383 oconfig_item_t *child = ci->children + i;
384 if (strcasecmp("Query", child->key) == 0)
385 udb_query_create(&queries, &queries_num, child,
386 /* callback = */ NULL);
387 else if (strcasecmp("Database", child->key) == 0)
388 cdbi_config_add_database(child);
389 else {
390 WARNING("dbi plugin: Ignoring unknown config option `%s'.", child->key);
391 }
392 } /* for (ci->children) */
394 return (0);
395 } /* }}} int cdbi_config */
397 /* }}} End of configuration handling functions */
399 static int cdbi_init(void) /* {{{ */
400 {
401 static int did_init = 0;
402 int status;
404 if (did_init != 0)
405 return (0);
407 if (queries_num == 0) {
408 ERROR("dbi plugin: No <Query> blocks have been found. Without them, "
409 "this plugin can't do anything useful, so we will return an error.");
410 return (-1);
411 }
413 if (databases_num == 0) {
414 ERROR("dbi plugin: No <Database> blocks have been found. Without them, "
415 "this plugin can't do anything useful, so we will return an error.");
416 return (-1);
417 }
419 status = dbi_initialize_r(/* driverdir = */ NULL, &dbi_instance);
420 if (status < 0) {
421 ERROR("dbi plugin: cdbi_init: dbi_initialize_r failed with status %i.",
422 status);
423 return (-1);
424 } else if (status == 0) {
425 ERROR("dbi plugin: `dbi_initialize_r' could not load any drivers. Please "
426 "install at least one `DBD' or check your installation.");
427 return (-1);
428 }
429 DEBUG("dbi plugin: cdbi_init: dbi_initialize_r reports %i driver%s.", status,
430 (status == 1) ? "" : "s");
432 return (0);
433 } /* }}} int cdbi_init */
435 static int cdbi_read_database_query(cdbi_database_t *db, /* {{{ */
436 udb_query_t *q,
437 udb_query_preparation_area_t *prep_area) {
438 const char *statement;
439 dbi_result res;
440 size_t column_num;
441 char **column_names;
442 char **column_values;
443 int status;
445 /* Macro that cleans up dynamically allocated memory and returns the
446 * specified status. */
447 #define BAIL_OUT(status) \
448 if (column_names != NULL) { \
449 sfree(column_names[0]); \
450 sfree(column_names); \
451 } \
452 if (column_values != NULL) { \
453 sfree(column_values[0]); \
454 sfree(column_values); \
455 } \
456 if (res != NULL) { \
457 dbi_result_free(res); \
458 res = NULL; \
459 } \
460 return (status)
462 column_names = NULL;
463 column_values = NULL;
465 statement = udb_query_get_statement(q);
466 assert(statement != NULL);
468 res = dbi_conn_query(db->connection, statement);
469 if (res == NULL) {
470 char errbuf[1024];
471 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
472 "dbi_conn_query failed: %s",
473 db->name, udb_query_get_name(q),
474 cdbi_strerror(db->connection, errbuf, sizeof(errbuf)));
475 BAIL_OUT(-1);
476 } else /* Get the number of columns */
477 {
478 unsigned int db_status;
480 db_status = dbi_result_get_numfields(res);
481 if (db_status == DBI_FIELD_ERROR) {
482 char errbuf[1024];
483 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
484 "dbi_result_get_numfields failed: %s",
485 db->name, udb_query_get_name(q),
486 cdbi_strerror(db->connection, errbuf, sizeof(errbuf)));
487 BAIL_OUT(-1);
488 }
490 column_num = (size_t)db_status;
491 DEBUG("cdbi_read_database_query (%s, %s): There are %zu columns.", db->name,
492 udb_query_get_name(q), column_num);
493 }
495 /* Allocate `column_names' and `column_values'. {{{ */
496 column_names = calloc(column_num, sizeof(*column_names));
497 if (column_names == NULL) {
498 ERROR("dbi plugin: calloc failed.");
499 BAIL_OUT(-1);
500 }
502 column_names[0] = calloc(column_num, DATA_MAX_NAME_LEN);
503 if (column_names[0] == NULL) {
504 ERROR("dbi plugin: calloc failed.");
505 BAIL_OUT(-1);
506 }
507 for (size_t i = 1; i < column_num; i++)
508 column_names[i] = column_names[i - 1] + DATA_MAX_NAME_LEN;
510 column_values = calloc(column_num, sizeof(*column_values));
511 if (column_values == NULL) {
512 ERROR("dbi plugin: calloc failed.");
513 BAIL_OUT(-1);
514 }
516 column_values[0] = calloc(column_num, DATA_MAX_NAME_LEN);
517 if (column_values[0] == NULL) {
518 ERROR("dbi plugin: calloc failed.");
519 BAIL_OUT(-1);
520 }
521 for (size_t i = 1; i < column_num; i++)
522 column_values[i] = column_values[i - 1] + DATA_MAX_NAME_LEN;
523 /* }}} */
525 /* Copy the field names to `column_names' */
526 for (size_t i = 0; i < column_num; i++) /* {{{ */
527 {
528 const char *column_name;
530 column_name = dbi_result_get_field_name(res, (unsigned int)(i + 1));
531 if (column_name == NULL) {
532 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
533 "Cannot retrieve name of field %zu.",
534 db->name, udb_query_get_name(q), i + 1);
535 BAIL_OUT(-1);
536 }
538 sstrncpy(column_names[i], column_name, DATA_MAX_NAME_LEN);
539 } /* }}} for (i = 0; i < column_num; i++) */
541 udb_query_prepare_result(
542 q, prep_area, (db->host ? db->host : hostname_g),
543 /* plugin = */ "dbi", db->name, column_names, column_num,
544 /* interval = */ (db->interval > 0) ? db->interval : 0);
546 /* 0 = error; 1 = success; */
547 status = dbi_result_first_row(res); /* {{{ */
548 if (status != 1) {
549 char errbuf[1024];
550 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
551 "dbi_result_first_row failed: %s. Maybe the statement didn't "
552 "return any rows?",
553 db->name, udb_query_get_name(q),
554 cdbi_strerror(db->connection, errbuf, sizeof(errbuf)));
555 udb_query_finish_result(q, prep_area);
556 BAIL_OUT(-1);
557 } /* }}} */
559 /* Iterate over all rows and call `udb_query_handle_result' with each list of
560 * values. */
561 while (42) /* {{{ */
562 {
563 status = 0;
564 /* Copy the value of the columns to `column_values' */
565 for (size_t i = 0; i < column_num; i++) /* {{{ */
566 {
567 status = cdbi_result_get_field(res, (unsigned int)(i + 1),
568 column_values[i], DATA_MAX_NAME_LEN);
570 if (status != 0) {
571 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
572 "cdbi_result_get_field (%zu) failed.",
573 db->name, udb_query_get_name(q), i + 1);
574 status = -1;
575 break;
576 }
577 } /* }}} for (i = 0; i < column_num; i++) */
579 /* If all values were copied successfully, call `udb_query_handle_result'
580 * to dispatch the row to the daemon. */
581 if (status == 0) /* {{{ */
582 {
583 status = udb_query_handle_result(q, prep_area, column_values);
584 if (status != 0) {
585 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
586 "udb_query_handle_result failed.",
587 db->name, udb_query_get_name(q));
588 }
589 } /* }}} */
591 /* Get the next row from the database. */
592 status = dbi_result_next_row(res); /* {{{ */
593 if (status != 1) {
594 if (dbi_conn_error(db->connection, NULL) != 0) {
595 char errbuf[1024];
596 WARNING("dbi plugin: cdbi_read_database_query (%s, %s): "
597 "dbi_result_next_row failed: %s.",
598 db->name, udb_query_get_name(q),
599 cdbi_strerror(db->connection, errbuf, sizeof(errbuf)));
600 }
601 break;
602 } /* }}} */
603 } /* }}} while (42) */
605 /* Tell the db query interface that we're done with this query. */
606 udb_query_finish_result(q, prep_area);
608 /* Clean up and return `status = 0' (success) */
609 BAIL_OUT(0);
610 #undef BAIL_OUT
611 } /* }}} int cdbi_read_database_query */
613 static int cdbi_connect_database(cdbi_database_t *db) /* {{{ */
614 {
615 dbi_driver driver;
616 dbi_conn connection;
617 int status;
619 if (db->connection != NULL) {
620 status = dbi_conn_ping(db->connection);
621 if (status != 0) /* connection is alive */
622 return (0);
624 dbi_conn_close(db->connection);
625 db->connection = NULL;
626 }
628 driver = dbi_driver_open_r(db->driver, dbi_instance);
629 if (driver == NULL) {
630 ERROR("dbi plugin: cdbi_connect_database: dbi_driver_open_r (%s) failed.",
631 db->driver);
632 INFO("dbi plugin: Maybe the driver isn't installed? "
633 "Known drivers are:");
634 for (driver = dbi_driver_list_r(NULL, dbi_instance); driver != NULL;
635 driver = dbi_driver_list_r(driver, dbi_instance)) {
636 INFO("dbi plugin: * %s", dbi_driver_get_name(driver));
637 }
638 return (-1);
639 }
641 connection = dbi_conn_open(driver);
642 if (connection == NULL) {
643 ERROR("dbi plugin: cdbi_connect_database: dbi_conn_open (%s) failed.",
644 db->driver);
645 return (-1);
646 }
648 /* Set all the driver options. Because this is a very very very generic
649 * interface, the error handling is kind of long. If an invalid option is
650 * encountered, it will get a list of options understood by the driver and
651 * report that as `INFO'. This way, users hopefully don't have too much
652 * trouble finding out how to configure the plugin correctly.. */
653 for (size_t i = 0; i < db->driver_options_num; i++) {
654 if (db->driver_options[i].is_numeric) {
655 status =
656 dbi_conn_set_option_numeric(connection, db->driver_options[i].key,
657 db->driver_options[i].value.numeric);
658 if (status != 0) {
659 char errbuf[1024];
660 ERROR("dbi plugin: cdbi_connect_database (%s): "
661 "dbi_conn_set_option_numeric (\"%s\", %i) failed: %s.",
662 db->name, db->driver_options[i].key,
663 db->driver_options[i].value.numeric,
664 cdbi_strerror(connection, errbuf, sizeof(errbuf)));
665 }
666 } else {
667 status = dbi_conn_set_option(connection, db->driver_options[i].key,
668 db->driver_options[i].value.string);
669 if (status != 0) {
670 char errbuf[1024];
671 ERROR("dbi plugin: cdbi_connect_database (%s): "
672 "dbi_conn_set_option (\"%s\", \"%s\") failed: %s.",
673 db->name, db->driver_options[i].key,
674 db->driver_options[i].value.string,
675 cdbi_strerror(connection, errbuf, sizeof(errbuf)));
676 }
677 }
679 if (status != 0) {
680 INFO("dbi plugin: This is a list of all options understood "
681 "by the `%s' driver:",
682 db->driver);
683 for (const char *opt = dbi_conn_get_option_list(connection, NULL);
684 opt != NULL; opt = dbi_conn_get_option_list(connection, opt)) {
685 INFO("dbi plugin: * %s", opt);
686 }
688 dbi_conn_close(connection);
689 return (-1);
690 }
691 } /* for (i = 0; i < db->driver_options_num; i++) */
693 status = dbi_conn_connect(connection);
694 if (status != 0) {
695 char errbuf[1024];
696 ERROR("dbi plugin: cdbi_connect_database (%s): "
697 "dbi_conn_connect failed: %s",
698 db->name, cdbi_strerror(connection, errbuf, sizeof(errbuf)));
699 dbi_conn_close(connection);
700 return (-1);
701 }
703 if (db->select_db != NULL) {
704 status = dbi_conn_select_db(connection, db->select_db);
705 if (status != 0) {
706 char errbuf[1024];
707 WARNING(
708 "dbi plugin: cdbi_connect_database (%s): "
709 "dbi_conn_select_db (%s) failed: %s. Check the `SelectDB' option.",
710 db->name, db->select_db,
711 cdbi_strerror(connection, errbuf, sizeof(errbuf)));
712 dbi_conn_close(connection);
713 return (-1);
714 }
715 }
717 db->connection = connection;
718 return (0);
719 } /* }}} int cdbi_connect_database */
721 static int cdbi_read_database(user_data_t *ud) /* {{{ */
722 {
723 cdbi_database_t *db = (cdbi_database_t *)ud->data;
724 int success;
725 int status;
727 unsigned int db_version;
729 status = cdbi_connect_database(db);
730 if (status != 0)
731 return (status);
732 assert(db->connection != NULL);
734 db_version = dbi_conn_get_engine_version(db->connection);
735 /* TODO: Complain if `db_version == 0' */
737 success = 0;
738 for (size_t i = 0; i < db->queries_num; i++) {
739 /* Check if we know the database's version and if so, if this query applies
740 * to that version. */
741 if ((db_version != 0) &&
742 (udb_query_check_version(db->queries[i], db_version) == 0))
743 continue;
745 status = cdbi_read_database_query(db, db->queries[i], db->q_prep_areas[i]);
746 if (status == 0)
747 success++;
748 }
750 if (success == 0) {
751 ERROR("dbi plugin: All queries failed for database `%s'.", db->name);
752 return (-1);
753 }
755 return (0);
756 } /* }}} int cdbi_read_database */
758 static int cdbi_shutdown(void) /* {{{ */
759 {
760 for (size_t i = 0; i < databases_num; i++) {
761 if (databases[i]->connection != NULL) {
762 dbi_conn_close(databases[i]->connection);
763 databases[i]->connection = NULL;
764 }
765 cdbi_database_free(databases[i]);
766 }
767 sfree(databases);
768 databases_num = 0;
770 udb_query_free(queries, queries_num);
771 queries = NULL;
772 queries_num = 0;
774 return (0);
775 } /* }}} int cdbi_shutdown */
777 void module_register(void) /* {{{ */
778 {
779 plugin_register_complex_config("dbi", cdbi_config);
780 plugin_register_init("dbi", cdbi_init);
781 plugin_register_shutdown("dbi", cdbi_shutdown);
782 } /* }}} void module_register */