3 * Copyright (C) 2008-2015 Florian octo Forster
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:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
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.
24 * Florian octo Forster <octo at collectd.org>
31 #include "utils_db_query.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)
50 struct cdbi_driver_option_s /* {{{ */
59 typedef struct cdbi_driver_option_s cdbi_driver_option_t; /* }}} */
61 struct cdbi_database_s /* {{{ */
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;
79 typedef struct cdbi_database_s cdbi_database_t; /* }}} */
84 #if !defined(HAVE_LEGACY_LIBDBI) || !HAVE_LEGACY_LIBDBI
85 static dbi_inst dbi_instance = 0;
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);
97 static const char *cdbi_strerror(dbi_conn conn, /* {{{ */
98 char *buffer, size_t buffer_size) {
103 sstrncpy(buffer, "connection is NULL", buffer_size);
108 status = dbi_conn_error(conn, &msg);
109 if ((status >= 0) && (msg != NULL))
110 ssnprintf(buffer, buffer_size, "%s (status %i)", msg, status);
112 ssnprintf(buffer, buffer_size, "dbi_conn_error failed with status %i",
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.");
130 if (src_type == DBI_TYPE_INTEGER) {
133 value = dbi_result_get_longlong_idx(res, index);
134 ssnprintf(buffer, buffer_size, "%lli", value);
135 } else if (src_type == DBI_TYPE_DECIMAL) {
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) {
143 value = dbi_result_get_string_idx(res, index);
145 sstrncpy(buffer, "", buffer_size);
146 else if (strcmp("ERROR", value) == 0)
149 sstrncpy(buffer, value, buffer_size);
151 /* DBI_TYPE_BINARY */
152 /* DBI_TYPE_DATETIME */
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 "
162 field_name, src_type);
167 } /* }}} int cdbi_result_get_field */
169 static void cdbi_database_free(cdbi_database_t *db) /* {{{ */
175 sfree(db->select_db);
179 for (size_t i = 0; i < db->driver_options_num; i++) {
180 sfree(db->driver_options[i].key);
181 if (!db->driver_options[i].is_numeric)
182 sfree(db->driver_options[i].value.string);
184 sfree(db->driver_options);
186 if (db->q_prep_areas)
187 for (size_t i = 0; i < db->queries_num; ++i)
188 udb_query_delete_preparation_area(db->q_prep_areas[i]);
189 sfree(db->q_prep_areas);
190 /* N.B.: db->queries references objects "owned" by the global queries
191 * variable. Free the array here, but not the content. */
195 } /* }}} void cdbi_database_free */
197 /* Configuration handling functions {{{
200 * <Query "plugin_instance0">
201 * Statement "SELECT name, value FROM table"
204 * InstancesFrom "name"
210 * <Database "plugin_instance1">
213 * DriverOption "hostname" "localhost"
215 * Query "plugin_instance0"
220 static int cdbi_config_add_database_driver_option(cdbi_database_t *db, /* {{{ */
221 oconfig_item_t *ci) {
222 cdbi_driver_option_t *option;
224 if ((ci->values_num != 2) || (ci->values[0].type != OCONFIG_TYPE_STRING) ||
225 ((ci->values[1].type != OCONFIG_TYPE_STRING) &&
226 (ci->values[1].type != OCONFIG_TYPE_NUMBER))) {
227 WARNING("dbi plugin: The `DriverOption' config option "
228 "needs exactly two arguments.");
232 option = realloc(db->driver_options,
233 sizeof(*option) * (db->driver_options_num + 1));
234 if (option == NULL) {
235 ERROR("dbi plugin: realloc failed");
239 db->driver_options = option;
240 option = db->driver_options + db->driver_options_num;
241 memset(option, 0, sizeof(*option));
243 option->key = strdup(ci->values[0].value.string);
244 if (option->key == NULL) {
245 ERROR("dbi plugin: strdup failed.");
249 if (ci->values[1].type == OCONFIG_TYPE_STRING) {
250 option->value.string = strdup(ci->values[1].value.string);
251 if (option->value.string == NULL) {
252 ERROR("dbi plugin: strdup failed.");
257 assert(ci->values[1].type == OCONFIG_TYPE_NUMBER);
258 option->value.numeric = (int)(ci->values[1].value.number + .5);
259 option->is_numeric = 1;
262 db->driver_options_num++;
264 } /* }}} int cdbi_config_add_database_driver_option */
266 static int cdbi_config_add_database(oconfig_item_t *ci) /* {{{ */
271 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING)) {
272 WARNING("dbi plugin: The `Database' block "
273 "needs exactly one string argument.");
277 db = calloc(1, sizeof(*db));
279 ERROR("dbi plugin: calloc failed.");
283 status = cf_util_get_string(ci, &db->name);
289 /* Fill the `cdbi_database_t' structure.. */
290 for (int i = 0; i < ci->children_num; i++) {
291 oconfig_item_t *child = ci->children + i;
293 if (strcasecmp("Driver", child->key) == 0)
294 status = cf_util_get_string(child, &db->driver);
295 else if (strcasecmp("DriverOption", child->key) == 0)
296 status = cdbi_config_add_database_driver_option(db, child);
297 else if (strcasecmp("SelectDB", child->key) == 0)
298 status = cf_util_get_string(child, &db->select_db);
299 else if (strcasecmp("Query", child->key) == 0)
300 status = udb_query_pick_from_list(child, queries, queries_num,
301 &db->queries, &db->queries_num);
302 else if (strcasecmp("Host", child->key) == 0)
303 status = cf_util_get_string(child, &db->host);
304 else if (strcasecmp("Interval", child->key) == 0)
305 status = cf_util_get_cdtime(child, &db->interval);
307 WARNING("dbi plugin: Option `%s' not allowed here.", child->key);
315 /* Check that all necessary options have been given. */
316 while (status == 0) {
317 if (db->driver == NULL) {
318 WARNING("dbi plugin: `Driver' not given for database `%s'", db->name);
321 if (db->driver_options_num == 0) {
322 WARNING("dbi plugin: No `DriverOption' given for database `%s'. "
323 "This will likely not work.",
328 } /* while (status == 0) */
330 while ((status == 0) && (db->queries_num > 0)) {
331 db->q_prep_areas = calloc(db->queries_num, sizeof(*db->q_prep_areas));
332 if (db->q_prep_areas == NULL) {
333 WARNING("dbi plugin: calloc failed");
338 for (size_t i = 0; i < db->queries_num; ++i) {
339 db->q_prep_areas[i] = udb_query_allocate_preparation_area(db->queries[i]);
341 if (db->q_prep_areas[i] == NULL) {
342 WARNING("dbi plugin: udb_query_allocate_preparation_area failed");
351 /* If all went well, add this database to the global list of databases. */
353 cdbi_database_t **temp;
355 temp = realloc(databases, sizeof(*databases) * (databases_num + 1));
357 ERROR("dbi plugin: realloc failed");
361 databases[databases_num] = db;
364 char *name = ssnprintf_alloc("dbi:%s", db->name);
365 plugin_register_complex_read(
367 /* name = */ name ? name : db->name,
368 /* callback = */ cdbi_read_database,
369 /* interval = */ (db->interval > 0) ? db->interval : 0,
378 cdbi_database_free(db);
383 } /* }}} int cdbi_config_add_database */
385 static int cdbi_config(oconfig_item_t *ci) /* {{{ */
387 for (int i = 0; i < ci->children_num; i++) {
388 oconfig_item_t *child = ci->children + i;
389 if (strcasecmp("Query", child->key) == 0)
390 udb_query_create(&queries, &queries_num, child,
391 /* callback = */ NULL);
392 else if (strcasecmp("Database", child->key) == 0)
393 cdbi_config_add_database(child);
395 WARNING("dbi plugin: Ignoring unknown config option `%s'.", child->key);
397 } /* for (ci->children) */
400 } /* }}} int cdbi_config */
402 /* }}} End of configuration handling functions */
404 static int cdbi_init(void) /* {{{ */
406 static int did_init = 0;
412 if (queries_num == 0) {
413 ERROR("dbi plugin: No <Query> blocks have been found. Without them, "
414 "this plugin can't do anything useful, so we will return an error.");
418 if (databases_num == 0) {
419 ERROR("dbi plugin: No <Database> blocks have been found. Without them, "
420 "this plugin can't do anything useful, so we will return an error.");
424 status = dbi_initialize_r(/* driverdir = */ NULL, &dbi_instance);
426 ERROR("dbi plugin: cdbi_init: dbi_initialize_r failed with status %i.",
429 } else if (status == 0) {
430 ERROR("dbi plugin: `dbi_initialize_r' could not load any drivers. Please "
431 "install at least one `DBD' or check your installation.");
434 DEBUG("dbi plugin: cdbi_init: dbi_initialize_r reports %i driver%s.", status,
435 (status == 1) ? "" : "s");
438 } /* }}} int cdbi_init */
440 static int cdbi_read_database_query(cdbi_database_t *db, /* {{{ */
442 udb_query_preparation_area_t *prep_area) {
443 const char *statement;
447 char **column_values;
450 /* Macro that cleans up dynamically allocated memory and returns the
451 * specified status. */
452 #define BAIL_OUT(status) \
453 if (column_names != NULL) { \
454 sfree(column_names[0]); \
455 sfree(column_names); \
457 if (column_values != NULL) { \
458 sfree(column_values[0]); \
459 sfree(column_values); \
462 dbi_result_free(res); \
468 column_values = NULL;
470 statement = udb_query_get_statement(q);
471 assert(statement != NULL);
473 res = dbi_conn_query(db->connection, statement);
476 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
477 "dbi_conn_query failed: %s",
478 db->name, udb_query_get_name(q),
479 cdbi_strerror(db->connection, errbuf, sizeof(errbuf)));
481 } else /* Get the number of columns */
483 unsigned int db_status;
485 db_status = dbi_result_get_numfields(res);
486 if (db_status == DBI_FIELD_ERROR) {
488 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
489 "dbi_result_get_numfields failed: %s",
490 db->name, udb_query_get_name(q),
491 cdbi_strerror(db->connection, errbuf, sizeof(errbuf)));
495 column_num = (size_t)db_status;
496 DEBUG("cdbi_read_database_query (%s, %s): There are %zu columns.", db->name,
497 udb_query_get_name(q), column_num);
500 /* Allocate `column_names' and `column_values'. {{{ */
501 column_names = calloc(column_num, sizeof(*column_names));
502 if (column_names == NULL) {
503 ERROR("dbi plugin: calloc failed.");
507 column_names[0] = calloc(column_num, DATA_MAX_NAME_LEN);
508 if (column_names[0] == NULL) {
509 ERROR("dbi plugin: calloc failed.");
512 for (size_t i = 1; i < column_num; i++)
513 column_names[i] = column_names[i - 1] + DATA_MAX_NAME_LEN;
515 column_values = calloc(column_num, sizeof(*column_values));
516 if (column_values == NULL) {
517 ERROR("dbi plugin: calloc failed.");
521 column_values[0] = calloc(column_num, DATA_MAX_NAME_LEN);
522 if (column_values[0] == NULL) {
523 ERROR("dbi plugin: calloc failed.");
526 for (size_t i = 1; i < column_num; i++)
527 column_values[i] = column_values[i - 1] + DATA_MAX_NAME_LEN;
530 /* Copy the field names to `column_names' */
531 for (size_t i = 0; i < column_num; i++) /* {{{ */
533 const char *column_name;
535 column_name = dbi_result_get_field_name(res, (unsigned int)(i + 1));
536 if (column_name == NULL) {
537 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
538 "Cannot retrieve name of field %zu.",
539 db->name, udb_query_get_name(q), i + 1);
543 sstrncpy(column_names[i], column_name, DATA_MAX_NAME_LEN);
544 } /* }}} for (i = 0; i < column_num; i++) */
546 udb_query_prepare_result(
547 q, prep_area, (db->host ? db->host : hostname_g),
548 /* plugin = */ "dbi", db->name, column_names, column_num,
549 /* interval = */ (db->interval > 0) ? db->interval : 0);
551 /* 0 = error; 1 = success; */
552 status = dbi_result_first_row(res); /* {{{ */
555 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
556 "dbi_result_first_row failed: %s. Maybe the statement didn't "
558 db->name, udb_query_get_name(q),
559 cdbi_strerror(db->connection, errbuf, sizeof(errbuf)));
560 udb_query_finish_result(q, prep_area);
564 /* Iterate over all rows and call `udb_query_handle_result' with each list of
569 /* Copy the value of the columns to `column_values' */
570 for (size_t i = 0; i < column_num; i++) /* {{{ */
572 status = cdbi_result_get_field(res, (unsigned int)(i + 1),
573 column_values[i], DATA_MAX_NAME_LEN);
576 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
577 "cdbi_result_get_field (%zu) failed.",
578 db->name, udb_query_get_name(q), i + 1);
582 } /* }}} for (i = 0; i < column_num; i++) */
584 /* If all values were copied successfully, call `udb_query_handle_result'
585 * to dispatch the row to the daemon. */
586 if (status == 0) /* {{{ */
588 status = udb_query_handle_result(q, prep_area, column_values);
590 ERROR("dbi plugin: cdbi_read_database_query (%s, %s): "
591 "udb_query_handle_result failed.",
592 db->name, udb_query_get_name(q));
596 /* Get the next row from the database. */
597 status = dbi_result_next_row(res); /* {{{ */
599 if (dbi_conn_error(db->connection, NULL) != 0) {
601 WARNING("dbi plugin: cdbi_read_database_query (%s, %s): "
602 "dbi_result_next_row failed: %s.",
603 db->name, udb_query_get_name(q),
604 cdbi_strerror(db->connection, errbuf, sizeof(errbuf)));
608 } /* }}} while (42) */
610 /* Tell the db query interface that we're done with this query. */
611 udb_query_finish_result(q, prep_area);
613 /* Clean up and return `status = 0' (success) */
616 } /* }}} int cdbi_read_database_query */
618 static int cdbi_connect_database(cdbi_database_t *db) /* {{{ */
624 if (db->connection != NULL) {
625 status = dbi_conn_ping(db->connection);
626 if (status != 0) /* connection is alive */
629 dbi_conn_close(db->connection);
630 db->connection = NULL;
633 driver = dbi_driver_open_r(db->driver, dbi_instance);
634 if (driver == NULL) {
635 ERROR("dbi plugin: cdbi_connect_database: dbi_driver_open_r (%s) failed.",
637 INFO("dbi plugin: Maybe the driver isn't installed? "
638 "Known drivers are:");
639 for (driver = dbi_driver_list_r(NULL, dbi_instance); driver != NULL;
640 driver = dbi_driver_list_r(driver, dbi_instance)) {
641 INFO("dbi plugin: * %s", dbi_driver_get_name(driver));
646 connection = dbi_conn_open(driver);
647 if (connection == NULL) {
648 ERROR("dbi plugin: cdbi_connect_database: dbi_conn_open (%s) failed.",
653 /* Set all the driver options. Because this is a very very very generic
654 * interface, the error handling is kind of long. If an invalid option is
655 * encountered, it will get a list of options understood by the driver and
656 * report that as `INFO'. This way, users hopefully don't have too much
657 * trouble finding out how to configure the plugin correctly.. */
658 for (size_t i = 0; i < db->driver_options_num; i++) {
659 if (db->driver_options[i].is_numeric) {
661 dbi_conn_set_option_numeric(connection, db->driver_options[i].key,
662 db->driver_options[i].value.numeric);
665 ERROR("dbi plugin: cdbi_connect_database (%s): "
666 "dbi_conn_set_option_numeric (\"%s\", %i) failed: %s.",
667 db->name, db->driver_options[i].key,
668 db->driver_options[i].value.numeric,
669 cdbi_strerror(connection, errbuf, sizeof(errbuf)));
672 status = dbi_conn_set_option(connection, db->driver_options[i].key,
673 db->driver_options[i].value.string);
676 ERROR("dbi plugin: cdbi_connect_database (%s): "
677 "dbi_conn_set_option (\"%s\", \"%s\") failed: %s.",
678 db->name, db->driver_options[i].key,
679 db->driver_options[i].value.string,
680 cdbi_strerror(connection, errbuf, sizeof(errbuf)));
685 INFO("dbi plugin: This is a list of all options understood "
686 "by the `%s' driver:",
688 for (const char *opt = dbi_conn_get_option_list(connection, NULL);
689 opt != NULL; opt = dbi_conn_get_option_list(connection, opt)) {
690 INFO("dbi plugin: * %s", opt);
693 dbi_conn_close(connection);
696 } /* for (i = 0; i < db->driver_options_num; i++) */
698 status = dbi_conn_connect(connection);
701 ERROR("dbi plugin: cdbi_connect_database (%s): "
702 "dbi_conn_connect failed: %s",
703 db->name, cdbi_strerror(connection, errbuf, sizeof(errbuf)));
704 dbi_conn_close(connection);
708 if (db->select_db != NULL) {
709 status = dbi_conn_select_db(connection, db->select_db);
713 "dbi plugin: cdbi_connect_database (%s): "
714 "dbi_conn_select_db (%s) failed: %s. Check the `SelectDB' option.",
715 db->name, db->select_db,
716 cdbi_strerror(connection, errbuf, sizeof(errbuf)));
717 dbi_conn_close(connection);
722 db->connection = connection;
724 } /* }}} int cdbi_connect_database */
726 static int cdbi_read_database(user_data_t *ud) /* {{{ */
728 cdbi_database_t *db = (cdbi_database_t *)ud->data;
732 unsigned int db_version;
734 status = cdbi_connect_database(db);
737 assert(db->connection != NULL);
739 db_version = dbi_conn_get_engine_version(db->connection);
740 /* TODO: Complain if `db_version == 0' */
743 for (size_t i = 0; i < db->queries_num; i++) {
744 /* Check if we know the database's version and if so, if this query applies
745 * to that version. */
746 if ((db_version != 0) &&
747 (udb_query_check_version(db->queries[i], db_version) == 0))
750 status = cdbi_read_database_query(db, db->queries[i], db->q_prep_areas[i]);
756 ERROR("dbi plugin: All queries failed for database `%s'.", db->name);
761 } /* }}} int cdbi_read_database */
763 static int cdbi_shutdown(void) /* {{{ */
765 for (size_t i = 0; i < databases_num; i++) {
766 if (databases[i]->connection != NULL) {
767 dbi_conn_close(databases[i]->connection);
768 databases[i]->connection = NULL;
770 cdbi_database_free(databases[i]);
775 udb_query_free(queries, queries_num);
780 } /* }}} int cdbi_shutdown */
782 void module_register(void) /* {{{ */
784 plugin_register_complex_config("dbi", cdbi_config);
785 plugin_register_init("dbi", cdbi_init);
786 plugin_register_shutdown("dbi", cdbi_shutdown);
787 } /* }}} void module_register */
790 * vim: shiftwidth=2 softtabstop=2 et fdm=marker