1 /**
2 * collectd - src/utils_db_query.c
3 * Copyright (C) 2008,2009 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
25 #include "configfile.h"
26 #include "utils_db_query.h"
28 /*
29 * Data types
30 */
31 struct udb_result_s; /* {{{ */
32 typedef struct udb_result_s udb_result_t;
33 struct udb_result_s
34 {
35 char *type;
36 char *instance_prefix;
37 char **instances;
38 size_t instances_num;
39 char **values;
40 size_t values_num;
42 /* Preparation area */
43 const data_set_t *ds;
44 size_t *instances_pos;
45 size_t *values_pos;
46 char **instances_buffer;
47 char **values_buffer;
49 udb_result_t *next;
50 }; /* }}} */
52 struct udb_query_s /* {{{ */
53 {
54 char *name;
55 char *statement;
56 void *user_data;
58 unsigned int min_version;
59 unsigned int max_version;
61 /* Preparation area */
62 size_t column_num;
63 char *host;
64 char *plugin;
65 char *db_name;
67 udb_result_t *results;
68 }; /* }}} */
70 /*
71 * Config Private functions
72 */
73 static int udb_config_set_string (char **ret_string, /* {{{ */
74 oconfig_item_t *ci)
75 {
76 char *string;
78 if ((ci->values_num != 1)
79 || (ci->values[0].type != OCONFIG_TYPE_STRING))
80 {
81 WARNING ("db query utils: The `%s' config option "
82 "needs exactly one string argument.", ci->key);
83 return (-1);
84 }
86 string = strdup (ci->values[0].value.string);
87 if (string == NULL)
88 {
89 ERROR ("db query utils: strdup failed.");
90 return (-1);
91 }
93 if (*ret_string != NULL)
94 free (*ret_string);
95 *ret_string = string;
97 return (0);
98 } /* }}} int udb_config_set_string */
100 static int udb_config_add_string (char ***ret_array, /* {{{ */
101 size_t *ret_array_len, oconfig_item_t *ci)
102 {
103 char **array;
104 size_t array_len;
105 int i;
107 if (ci->values_num < 1)
108 {
109 WARNING ("db query utils: The `%s' config option "
110 "needs at least one argument.", ci->key);
111 return (-1);
112 }
114 for (i = 0; i < ci->values_num; i++)
115 {
116 if (ci->values[i].type != OCONFIG_TYPE_STRING)
117 {
118 WARNING ("db query utils: Argument %i to the `%s' option "
119 "is not a string.", i + 1, ci->key);
120 return (-1);
121 }
122 }
124 array_len = *ret_array_len;
125 array = (char **) realloc (*ret_array,
126 sizeof (char *) * (array_len + ci->values_num));
127 if (array == NULL)
128 {
129 ERROR ("db query utils: realloc failed.");
130 return (-1);
131 }
132 *ret_array = array;
134 for (i = 0; i < ci->values_num; i++)
135 {
136 array[array_len] = strdup (ci->values[i].value.string);
137 if (array[array_len] == NULL)
138 {
139 ERROR ("db query utils: strdup failed.");
140 *ret_array_len = array_len;
141 return (-1);
142 }
143 array_len++;
144 }
146 *ret_array_len = array_len;
147 return (0);
148 } /* }}} int udb_config_add_string */
150 static int udb_config_set_uint (unsigned int *ret_value, /* {{{ */
151 oconfig_item_t *ci)
152 {
153 double tmp;
155 if ((ci->values_num != 1)
156 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
157 {
158 WARNING ("db query utils: The `%s' config option "
159 "needs exactly one numeric argument.", ci->key);
160 return (-1);
161 }
163 tmp = ci->values[0].value.number;
164 if ((tmp < 0.0) || (tmp > ((double) UINT_MAX)))
165 return (-ERANGE);
167 *ret_value = (unsigned int) (tmp + .5);
168 return (0);
169 } /* }}} int udb_config_set_uint */
171 /*
172 * Result private functions
173 */
174 static void udb_result_submit (udb_result_t *r, udb_query_t *q) /* {{{ */
175 {
176 value_list_t vl = VALUE_LIST_INIT;
177 size_t i;
179 assert (((size_t) r->ds->ds_num) == r->values_num);
181 DEBUG ("db query utils: udb_result_submit: r->instance_prefix = %s;",
182 (r->instance_prefix == NULL) ? "NULL" : r->instance_prefix);
183 for (i = 0; i < r->instances_num; i++)
184 {
185 DEBUG ("db query utils: udb_result_submit: r->instances_buffer[%zu] = %s;",
186 i, r->instances_buffer[i]);
187 }
189 vl.values = (value_t *) calloc (r->ds->ds_num, sizeof (value_t));
190 if (vl.values == NULL)
191 {
192 ERROR ("db query utils: malloc failed.");
193 return;
194 }
195 vl.values_len = r->ds->ds_num;
197 for (i = 0; i < r->values_num; i++)
198 {
199 char *endptr;
201 endptr = NULL;
202 errno = 0;
203 if (r->ds->ds[i].type == DS_TYPE_COUNTER)
204 vl.values[i].counter = (counter_t) strtoll (r->values_buffer[i],
205 &endptr, /* base = */ 0);
206 else if (r->ds->ds[i].type == DS_TYPE_GAUGE)
207 vl.values[i].gauge = (gauge_t) strtod (r->values_buffer[i], &endptr);
208 else
209 errno = EINVAL;
211 if ((endptr == r->values_buffer[i]) || (errno != 0))
212 {
213 WARNING ("db query utils: udb_result_submit: Parsing `%s' as %s failed.",
214 r->values_buffer[i],
215 (r->ds->ds[i].type == DS_TYPE_COUNTER) ? "counter" : "gauge");
216 vl.values[i].gauge = NAN;
217 }
218 }
220 sstrncpy (vl.host, q->host, sizeof (vl.host));
221 sstrncpy (vl.plugin, q->plugin, sizeof (vl.plugin));
222 sstrncpy (vl.plugin_instance, q->db_name, sizeof (vl.type_instance));
223 sstrncpy (vl.type, r->type, sizeof (vl.type));
225 if (r->instance_prefix == NULL)
226 {
227 strjoin (vl.type_instance, sizeof (vl.type_instance),
228 r->instances_buffer, r->instances_num, "-");
229 }
230 else
231 {
232 char tmp[DATA_MAX_NAME_LEN];
234 strjoin (tmp, sizeof (tmp), r->instances_buffer, r->instances_num, "-");
235 tmp[sizeof (tmp) - 1] = 0;
237 snprintf (vl.type_instance, sizeof (vl.type_instance), "%s-%s",
238 r->instance_prefix, tmp);
239 }
240 vl.type_instance[sizeof (vl.type_instance) - 1] = 0;
242 plugin_dispatch_values (&vl);
244 sfree (vl.values);
245 } /* }}} void udb_result_submit */
247 static void udb_result_finish_result (udb_result_t *r) /* {{{ */
248 {
249 if (r == NULL)
250 return;
252 r->ds = NULL;
253 sfree (r->instances_pos);
254 sfree (r->values_pos);
255 sfree (r->instances_buffer);
256 sfree (r->values_buffer);
257 } /* }}} void udb_result_finish_result */
259 static int udb_result_handle_result (udb_result_t *r, /* {{{ */
260 udb_query_t *q, char **column_values)
261 {
262 size_t i;
264 for (i = 0; i < r->instances_num; i++)
265 r->instances_buffer[i] = column_values[r->instances_pos[i]];
267 for (i = 0; i < r->values_num; i++)
268 r->values_buffer[i] = column_values[r->values_pos[i]];
270 udb_result_submit (r, q);
272 return (0);
273 } /* }}} int udb_result_handle_result */
275 static int udb_result_prepare_result (udb_result_t *r, /* {{{ */
276 char **column_names, size_t column_num)
277 {
278 size_t i;
280 if (r == NULL)
281 return (-EINVAL);
283 #define BAIL_OUT(status) \
284 r->ds = NULL; \
285 sfree (r->instances_pos); \
286 sfree (r->values_pos); \
287 sfree (r->instances_buffer); \
288 sfree (r->values_buffer); \
289 return (status)
291 /* Make sure previous preparations are cleaned up. */
292 udb_result_finish_result (r);
293 r->instances_pos = NULL;
294 r->values_pos = NULL;
296 /* Read `ds' and check number of values {{{ */
297 r->ds = plugin_get_ds (r->type);
298 if (r->ds == NULL)
299 {
300 ERROR ("db query utils: udb_result_prepare_result: Type `%s' is not "
301 "known by the daemon. See types.db(5) for details.",
302 r->type);
303 BAIL_OUT (-1);
304 }
306 if (((size_t) r->ds->ds_num) != r->values_num)
307 {
308 ERROR ("db query utils: udb_result_prepare_result: The type `%s' "
309 "requires exactly %i value%s, but the configuration specifies %zu.",
310 r->type,
311 r->ds->ds_num, (r->ds->ds_num == 1) ? "" : "s",
312 r->values_num);
313 BAIL_OUT (-1);
314 }
315 /* }}} */
317 /* Allocate r->instances_pos, r->values_pos, r->instances_buffer, and
318 * r->values_buffer {{{ */
319 r->instances_pos = (size_t *) calloc (r->instances_num, sizeof (size_t));
320 if (r->instances_pos == NULL)
321 {
322 ERROR ("db query utils: udb_result_prepare_result: malloc failed.");
323 BAIL_OUT (-ENOMEM);
324 }
326 r->values_pos = (size_t *) calloc (r->values_num, sizeof (size_t));
327 if (r->values_pos == NULL)
328 {
329 ERROR ("db query utils: udb_result_prepare_result: malloc failed.");
330 BAIL_OUT (-ENOMEM);
331 }
333 r->instances_buffer = (char **) calloc (r->instances_num, sizeof (char *));
334 if (r->instances_buffer == NULL)
335 {
336 ERROR ("db query utils: udb_result_prepare_result: malloc failed.");
337 BAIL_OUT (-ENOMEM);
338 }
340 r->values_buffer = (char **) calloc (r->values_num, sizeof (char *));
341 if (r->values_buffer == NULL)
342 {
343 ERROR ("db query utils: udb_result_prepare_result: malloc failed.");
344 BAIL_OUT (-ENOMEM);
345 }
346 /* }}} */
348 /* Determine the position of the instance columns {{{ */
349 for (i = 0; i < r->instances_num; i++)
350 {
351 size_t j;
353 for (j = 0; j < column_num; j++)
354 {
355 if (strcasecmp (r->instances[i], column_names[j]) == 0)
356 {
357 r->instances_pos[i] = j;
358 break;
359 }
360 }
362 if (j >= column_num)
363 {
364 ERROR ("db query utils: udb_result_prepare_result: "
365 "Column `%s' could not be found.",
366 r->instances[i]);
367 BAIL_OUT (-ENOENT);
368 }
369 } /* }}} for (i = 0; i < r->instances_num; i++) */
371 /* Determine the position of the value columns {{{ */
372 for (i = 0; i < r->values_num; i++)
373 {
374 size_t j;
376 for (j = 0; j < column_num; j++)
377 {
378 if (strcasecmp (r->values[i], column_names[j]) == 0)
379 {
380 r->values_pos[i] = j;
381 break;
382 }
383 }
385 if (j >= column_num)
386 {
387 ERROR ("db query utils: udb_result_prepare_result: "
388 "Column `%s' could not be found.",
389 r->values[i]);
390 BAIL_OUT (-ENOENT);
391 }
392 } /* }}} for (i = 0; i < r->values_num; i++) */
394 #undef BAIL_OUT
395 return (0);
396 } /* }}} int udb_result_prepare_result */
398 static void udb_result_free (udb_result_t *r) /* {{{ */
399 {
400 size_t i;
402 if (r == NULL)
403 return;
405 sfree (r->type);
407 for (i = 0; i < r->instances_num; i++)
408 sfree (r->instances[i]);
409 sfree (r->instances);
411 for (i = 0; i < r->values_num; i++)
412 sfree (r->values[i]);
413 sfree (r->values);
415 udb_result_free (r->next);
417 sfree (r);
418 } /* }}} void udb_result_free */
420 static int udb_result_create (const char *query_name, /* {{{ */
421 udb_result_t **r_head, oconfig_item_t *ci)
422 {
423 udb_result_t *r;
424 int status;
425 int i;
427 if (ci->values_num != 0)
428 {
429 WARNING ("db query utils: The `Result' block doesn't accept "
430 "any arguments. Ignoring %i argument%s.",
431 ci->values_num, (ci->values_num == 1) ? "" : "s");
432 }
434 r = (udb_result_t *) malloc (sizeof (*r));
435 if (r == NULL)
436 {
437 ERROR ("db query utils: malloc failed.");
438 return (-1);
439 }
440 memset (r, 0, sizeof (*r));
441 r->type = NULL;
442 r->instance_prefix = NULL;
443 r->instances = NULL;
444 r->values = NULL;
445 r->next = NULL;
447 /* Fill the `udb_result_t' structure.. */
448 status = 0;
449 for (i = 0; i < ci->children_num; i++)
450 {
451 oconfig_item_t *child = ci->children + i;
453 if (strcasecmp ("Type", child->key) == 0)
454 status = udb_config_set_string (&r->type, child);
455 else if (strcasecmp ("InstancePrefix", child->key) == 0)
456 status = udb_config_set_string (&r->instance_prefix, child);
457 else if (strcasecmp ("InstancesFrom", child->key) == 0)
458 status = udb_config_add_string (&r->instances, &r->instances_num, child);
459 else if (strcasecmp ("ValuesFrom", child->key) == 0)
460 status = udb_config_add_string (&r->values, &r->values_num, child);
461 else
462 {
463 WARNING ("db query utils: Query `%s': Option `%s' not allowed here.",
464 query_name, child->key);
465 status = -1;
466 }
468 if (status != 0)
469 break;
470 }
472 /* Check that all necessary options have been given. */
473 while (status == 0)
474 {
475 if (r->type == NULL)
476 {
477 WARNING ("db query utils: `Type' not given for "
478 "result in query `%s'", query_name);
479 status = -1;
480 }
481 if (r->instances == NULL)
482 {
483 WARNING ("db query utils: `InstancesFrom' not given for "
484 "result in query `%s'", query_name);
485 status = -1;
486 }
487 if (r->values == NULL)
488 {
489 WARNING ("db query utils: `ValuesFrom' not given for "
490 "result in query `%s'", query_name);
491 status = -1;
492 }
494 break;
495 } /* while (status == 0) */
497 if (status != 0)
498 {
499 udb_result_free (r);
500 return (-1);
501 }
503 /* If all went well, add this result to the list of results. */
504 if (*r_head == NULL)
505 {
506 *r_head = r;
507 }
508 else
509 {
510 udb_result_t *last;
512 last = *r_head;
513 while (last->next != NULL)
514 last = last->next;
516 last->next = r;
517 }
519 return (0);
520 } /* }}} int udb_result_create */
522 /*
523 * Query private functions
524 */
525 void udb_query_free_one (udb_query_t *q) /* {{{ */
526 {
527 if (q == NULL)
528 return;
530 sfree (q->name);
531 sfree (q->statement);
533 udb_result_free (q->results);
535 sfree (q);
536 } /* }}} void udb_query_free_one */
538 /*
539 * Query public functions
540 */
541 int udb_query_create (udb_query_t ***ret_query_list, /* {{{ */
542 size_t *ret_query_list_len, oconfig_item_t *ci,
543 udb_query_create_callback_t cb)
544 {
545 udb_query_t **query_list;
546 size_t query_list_len;
548 udb_query_t *q;
549 int status;
550 int i;
552 if ((ret_query_list == NULL) || (ret_query_list_len == NULL))
553 return (-EINVAL);
554 query_list = *ret_query_list;
555 query_list_len = *ret_query_list_len;
557 if ((ci->values_num != 1)
558 || (ci->values[0].type != OCONFIG_TYPE_STRING))
559 {
560 WARNING ("db query utils: The `Query' block "
561 "needs exactly one string argument.");
562 return (-1);
563 }
565 q = (udb_query_t *) malloc (sizeof (*q));
566 if (q == NULL)
567 {
568 ERROR ("db query utils: malloc failed.");
569 return (-1);
570 }
571 memset (q, 0, sizeof (*q));
572 q->min_version = 0;
573 q->max_version = UINT_MAX;
575 status = udb_config_set_string (&q->name, ci);
576 if (status != 0)
577 {
578 sfree (q);
579 return (status);
580 }
582 /* Fill the `udb_query_t' structure.. */
583 for (i = 0; i < ci->children_num; i++)
584 {
585 oconfig_item_t *child = ci->children + i;
587 if (strcasecmp ("Statement", child->key) == 0)
588 status = udb_config_set_string (&q->statement, child);
589 else if (strcasecmp ("Result", child->key) == 0)
590 status = udb_result_create (q->name, &q->results, child);
591 else if (strcasecmp ("MinVersion", child->key) == 0)
592 status = udb_config_set_uint (&q->min_version, child);
593 else if (strcasecmp ("MaxVersion", child->key) == 0)
594 status = udb_config_set_uint (&q->max_version, child);
595 /* PostgreSQL compatibility code */
596 else if (strcasecmp ("MinPGVersion", child->key) == 0)
597 {
598 WARNING ("db query utils: Query `%s': The `MinPGVersion' option is "
599 "deprecated. Please use `MinVersion' instead.",
600 q->name);
601 status = udb_config_set_uint (&q->min_version, child);
602 }
603 else if (strcasecmp ("MaxPGVersion", child->key) == 0)
604 {
605 WARNING ("db query utils: Query `%s': The `MaxPGVersion' option is "
606 "deprecated. Please use `MaxVersion' instead.",
607 q->name);
608 status = udb_config_set_uint (&q->max_version, child);
609 }
610 else if (cb != NULL)
611 {
612 status = (*cb) (q, child);
613 if (status != 0)
614 {
615 WARNING ("db query utils: The configuration callback failed "
616 "to handle `%s'.", child->key);
617 }
618 }
619 else
620 {
621 WARNING ("db query utils: Query `%s': Option `%s' not allowed here.",
622 q->name, child->key);
623 status = -1;
624 }
626 if (status != 0)
627 break;
628 }
630 /* Check that all necessary options have been given. */
631 if (status == 0)
632 {
633 if (q->statement == NULL)
634 {
635 WARNING ("db query utils: Query `%s': No `Statement' given.", q->name);
636 status = -1;
637 }
638 if (q->results == NULL)
639 {
640 WARNING ("db query utils: Query `%s': No (valid) `Result' block given.",
641 q->name);
642 status = -1;
643 }
644 } /* if (status == 0) */
646 /* If all went well, add this query to the list of queries within the
647 * database structure. */
648 if (status == 0)
649 {
650 udb_query_t **temp;
652 temp = (udb_query_t **) realloc (query_list,
653 sizeof (*query_list) * (query_list_len + 1));
654 if (temp == NULL)
655 {
656 ERROR ("db query utils: realloc failed");
657 status = -1;
658 }
659 else
660 {
661 query_list = temp;
662 query_list[query_list_len] = q;
663 query_list_len++;
664 }
665 }
667 if (status != 0)
668 {
669 udb_query_free_one (q);
670 return (-1);
671 }
673 *ret_query_list = query_list;
674 *ret_query_list_len = query_list_len;
676 return (0);
677 } /* }}} int udb_query_create */
679 void udb_query_free (udb_query_t **query_list, size_t query_list_len) /* {{{ */
680 {
681 size_t i;
683 if (query_list == NULL)
684 return;
686 for (i = 0; i < query_list_len; i++)
687 udb_query_free_one (query_list[i]);
689 sfree (query_list);
690 } /* }}} void udb_query_free */
692 int udb_query_pick_from_list (oconfig_item_t *ci, /* {{{ */
693 udb_query_t **src_list, size_t src_list_len,
694 udb_query_t ***dst_list, size_t *dst_list_len)
695 {
696 const char *name;
697 udb_query_t *q;
698 udb_query_t **tmp_list;
699 size_t tmp_list_len;
700 size_t i;
702 if ((ci == NULL) || (src_list == NULL) || (dst_list == NULL)
703 || (dst_list_len == NULL))
704 {
705 ERROR ("db query utils: Invalid argument.");
706 return (-EINVAL);
707 }
709 if ((ci->values_num != 1)
710 || (ci->values[0].type != OCONFIG_TYPE_STRING))
711 {
712 ERROR ("db query utils: The `%s' config option "
713 "needs exactly one string argument.", ci->key);
714 return (-1);
715 }
716 name = ci->values[0].value.string;
718 q = NULL;
719 for (i = 0; i < src_list_len; i++)
720 if (strcasecmp (name, src_list[i]->name) == 0)
721 {
722 q = src_list[i];
723 break;
724 }
726 if (q == NULL)
727 {
728 ERROR ("db query utils: Cannot find query `%s'. Make sure the <%s> "
729 "block is above the database definition!",
730 name, ci->key);
731 return (-ENOENT);
732 }
734 tmp_list_len = *dst_list_len;
735 tmp_list = (udb_query_t **) realloc (*dst_list, (tmp_list_len + 1)
736 * sizeof (udb_query_t *));
737 if (tmp_list == NULL)
738 {
739 ERROR ("db query utils: realloc failed.");
740 return (-ENOMEM);
741 }
742 tmp_list[tmp_list_len] = q;
743 tmp_list_len++;
745 *dst_list = tmp_list;
746 *dst_list_len = tmp_list_len;
748 return (0);
749 } /* }}} int udb_query_pick_from_list */
751 const char *udb_query_get_name (udb_query_t *q) /* {{{ */
752 {
753 if (q == NULL)
754 return (NULL);
756 return (q->name);
757 } /* }}} const char *udb_query_get_name */
759 const char *udb_query_get_statement (udb_query_t *q) /* {{{ */
760 {
761 if (q == NULL)
762 return (NULL);
764 return (q->statement);
765 } /* }}} const char *udb_query_get_statement */
767 void udb_query_set_user_data (udb_query_t *q, void *user_data) /* {{{ */
768 {
769 if (q == NULL)
770 return;
772 q->user_data = user_data;
773 } /* }}} void udb_query_set_user_data */
775 void *udb_query_get_user_data (udb_query_t *q) /* {{{ */
776 {
777 if (q == NULL)
778 return (NULL);
780 return (q->user_data);
781 } /* }}} void *udb_query_get_user_data */
783 int udb_query_check_version (udb_query_t *q, unsigned int version) /* {{{ */
784 {
785 if (q == NULL)
786 return (-EINVAL);
788 if ((version < q->min_version) || (version > q->max_version))
789 return (0);
791 return (1);
792 } /* }}} int udb_query_check_version */
794 void udb_query_finish_result (udb_query_t *q) /* {{{ */
795 {
796 udb_result_t *r;
798 if (q == NULL)
799 return;
801 q->column_num = 0;
802 sfree (q->host);
803 sfree (q->plugin);
804 sfree (q->db_name);
806 for (r = q->results; r != NULL; r = r->next)
807 udb_result_finish_result (r);
808 } /* }}} void udb_query_finish_result */
810 int udb_query_handle_result (udb_query_t *q, char **column_values) /* {{{ */
811 {
812 udb_result_t *r;
813 int success;
814 int status;
816 if (q == NULL)
817 return (-EINVAL);
819 if ((q->column_num < 1) || (q->host == NULL) || (q->plugin == NULL)
820 || (q->db_name == NULL))
821 {
822 ERROR ("db query utils: Query `%s': Query is not prepared; "
823 "can't handle result.", q->name);
824 return (-EINVAL);
825 }
827 #if defined(COLLECT_DEBUG) && COLLECT_DEBUG /* {{{ */
828 do
829 {
830 size_t i;
832 for (i = 0; i < q->column_num; i++)
833 {
834 DEBUG ("db query utils: udb_query_handle_result (%s, %s): "
835 "column[%zu] = %s;",
836 q->db_name, q->name, i, column_values[i]);
837 }
838 } while (0);
839 #endif /* }}} */
841 success = 0;
842 for (r = q->results; r != NULL; r = r->next)
843 {
844 status = udb_result_handle_result (r, q, column_values);
845 if (status == 0)
846 success++;
847 }
849 if (success == 0)
850 {
851 ERROR ("db query utils: udb_query_handle_result (%s, %s): "
852 "All results failed.", q->db_name, q->name);
853 return (-1);
854 }
856 return (0);
857 } /* }}} int udb_query_handle_result */
859 int udb_query_prepare_result (udb_query_t *q, /* {{{ */
860 const char *host, const char *plugin, const char *db_name,
861 char **column_names, size_t column_num)
862 {
863 udb_result_t *r;
864 int status;
866 if (q == NULL)
867 return (-EINVAL);
869 udb_query_finish_result (q);
871 q->column_num = column_num;
872 q->host = strdup (host);
873 q->plugin = strdup (plugin);
874 q->db_name = strdup (db_name);
876 if ((q->host == NULL) || (q->plugin == NULL) || (q->db_name == NULL))
877 {
878 ERROR ("db query utils: Query `%s': Prepare failed: Out of memory.", q->name);
879 udb_query_finish_result (q);
880 return (-ENOMEM);
881 }
883 #if defined(COLLECT_DEBUG) && COLLECT_DEBUG
884 do
885 {
886 size_t i;
888 for (i = 0; i < column_num; i++)
889 {
890 DEBUG ("db query utils: udb_query_prepare_result: "
891 "query = %s; column[%zu] = %s;",
892 q->name, i, column_names[i]);
893 }
894 } while (0);
895 #endif
897 for (r = q->results; r != NULL; r = r->next)
898 {
899 status = udb_result_prepare_result (r, column_names, column_num);
900 if (status != 0)
901 {
902 udb_query_finish_result (q);
903 return (status);
904 }
905 }
907 return (0);
908 } /* }}} int udb_query_prepare_result */
910 /* vim: set sw=2 sts=2 et fdm=marker : */