1 /**
2 * collectd - src/memcachec.c
3 * Copyright (C) 2009 Doug MacEachern
4 * Copyright (C) 2006-2009 Florian octo 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 * Doug MacEachern <Doug.MacEachern at hyperic.com>
21 * Florian octo Forster <octo at collectd.org>
22 **/
24 #include "collectd.h"
25 #include "common.h"
26 #include "plugin.h"
27 #include "configfile.h"
28 #include "utils_match.h"
30 #include <libmemcached/memcached.h>
32 /*
33 * Data types
34 */
35 struct web_match_s;
36 typedef struct web_match_s web_match_t;
37 struct web_match_s /* {{{ */
38 {
39 char *regex;
40 char *exclude_regex;
41 int dstype;
42 char *type;
43 char *instance;
45 cu_match_t *match;
47 web_match_t *next;
48 }; /* }}} */
50 struct web_page_s;
51 typedef struct web_page_s web_page_t;
52 struct web_page_s /* {{{ */
53 {
54 char *instance;
56 char *server;
57 char *key;
59 memcached_st *memc;
60 char *buffer;
62 web_match_t *matches;
64 web_page_t *next;
65 }; /* }}} */
67 /*
68 * Global variables;
69 */
70 static web_page_t *pages_g = NULL;
72 /*
73 * Private functions
74 */
75 static void cmc_web_match_free (web_match_t *wm) /* {{{ */
76 {
77 if (wm == NULL)
78 return;
80 sfree (wm->regex);
81 sfree (wm->type);
82 sfree (wm->instance);
83 match_destroy (wm->match);
84 cmc_web_match_free (wm->next);
85 sfree (wm);
86 } /* }}} void cmc_web_match_free */
88 static void cmc_web_page_free (web_page_t *wp) /* {{{ */
89 {
90 if (wp == NULL)
91 return;
93 if (wp->memc != NULL)
94 memcached_free(wp->memc);
95 wp->memc = NULL;
97 sfree (wp->instance);
98 sfree (wp->server);
99 sfree (wp->key);
100 sfree (wp->buffer);
102 cmc_web_match_free (wp->matches);
103 cmc_web_page_free (wp->next);
104 sfree (wp);
105 } /* }}} void cmc_web_page_free */
107 static int cmc_page_init_memc (web_page_t *wp) /* {{{ */
108 {
109 memcached_server_st *server;
111 wp->memc = memcached_create(NULL);
112 if (wp->memc == NULL)
113 {
114 ERROR ("memcachec plugin: memcached_create failed.");
115 return (-1);
116 }
118 server = memcached_servers_parse (wp->server);
119 memcached_server_push (wp->memc, server);
120 memcached_server_list_free (server);
122 return (0);
123 } /* }}} int cmc_page_init_memc */
125 static int cmc_config_add_string (const char *name, char **dest, /* {{{ */
126 oconfig_item_t *ci)
127 {
128 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
129 {
130 WARNING ("memcachec plugin: `%s' needs exactly one string argument.", name);
131 return (-1);
132 }
134 sfree (*dest);
135 *dest = strdup (ci->values[0].value.string);
136 if (*dest == NULL)
137 return (-1);
139 return (0);
140 } /* }}} int cmc_config_add_string */
142 static int cmc_config_add_match_dstype (int *dstype_ret, /* {{{ */
143 oconfig_item_t *ci)
144 {
145 int dstype;
147 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
148 {
149 WARNING ("memcachec plugin: `DSType' needs exactly one string argument.");
150 return (-1);
151 }
153 if (strncasecmp ("Gauge", ci->values[0].value.string,
154 strlen ("Gauge")) == 0)
155 {
156 dstype = UTILS_MATCH_DS_TYPE_GAUGE;
157 if (strcasecmp ("GaugeAverage", ci->values[0].value.string) == 0)
158 dstype |= UTILS_MATCH_CF_GAUGE_AVERAGE;
159 else if (strcasecmp ("GaugeMin", ci->values[0].value.string) == 0)
160 dstype |= UTILS_MATCH_CF_GAUGE_MIN;
161 else if (strcasecmp ("GaugeMax", ci->values[0].value.string) == 0)
162 dstype |= UTILS_MATCH_CF_GAUGE_MAX;
163 else if (strcasecmp ("GaugeLast", ci->values[0].value.string) == 0)
164 dstype |= UTILS_MATCH_CF_GAUGE_LAST;
165 else
166 dstype = 0;
167 }
168 else if (strncasecmp ("Counter", ci->values[0].value.string,
169 strlen ("Counter")) == 0)
170 {
171 dstype = UTILS_MATCH_DS_TYPE_COUNTER;
172 if (strcasecmp ("CounterSet", ci->values[0].value.string) == 0)
173 dstype |= UTILS_MATCH_CF_COUNTER_SET;
174 else if (strcasecmp ("CounterAdd", ci->values[0].value.string) == 0)
175 dstype |= UTILS_MATCH_CF_COUNTER_ADD;
176 else if (strcasecmp ("CounterInc", ci->values[0].value.string) == 0)
177 dstype |= UTILS_MATCH_CF_COUNTER_INC;
178 else
179 dstype = 0;
180 }
181 else
182 {
183 dstype = 0;
184 }
186 if (dstype == 0)
187 {
188 WARNING ("memcachec plugin: `%s' is not a valid argument to `DSType'.",
189 ci->values[0].value.string);
190 return (-1);
191 }
193 *dstype_ret = dstype;
194 return (0);
195 } /* }}} int cmc_config_add_match_dstype */
197 static int cmc_config_add_match (web_page_t *page, /* {{{ */
198 oconfig_item_t *ci)
199 {
200 web_match_t *match;
201 int status;
202 int i;
204 if (ci->values_num != 0)
205 {
206 WARNING ("memcachec plugin: Ignoring arguments for the `Match' block.");
207 }
209 match = calloc (1, sizeof (*match));
210 if (match == NULL)
211 {
212 ERROR ("memcachec plugin: calloc failed.");
213 return (-1);
214 }
216 status = 0;
217 for (i = 0; i < ci->children_num; i++)
218 {
219 oconfig_item_t *child = ci->children + i;
221 if (strcasecmp ("Regex", child->key) == 0)
222 status = cmc_config_add_string ("Regex", &match->regex, child);
223 else if (strcasecmp ("ExcludeRegex", child->key) == 0)
224 status = cmc_config_add_string ("ExcludeRegex", &match->exclude_regex, child);
225 else if (strcasecmp ("DSType", child->key) == 0)
226 status = cmc_config_add_match_dstype (&match->dstype, child);
227 else if (strcasecmp ("Type", child->key) == 0)
228 status = cmc_config_add_string ("Type", &match->type, child);
229 else if (strcasecmp ("Instance", child->key) == 0)
230 status = cmc_config_add_string ("Instance", &match->instance, child);
231 else
232 {
233 WARNING ("memcachec plugin: Option `%s' not allowed here.", child->key);
234 status = -1;
235 }
237 if (status != 0)
238 break;
239 } /* for (i = 0; i < ci->children_num; i++) */
241 while (status == 0)
242 {
243 if (match->regex == NULL)
244 {
245 WARNING ("memcachec plugin: `Regex' missing in `Match' block.");
246 status = -1;
247 }
249 if (match->type == NULL)
250 {
251 WARNING ("memcachec plugin: `Type' missing in `Match' block.");
252 status = -1;
253 }
255 if (match->dstype == 0)
256 {
257 WARNING ("memcachec plugin: `DSType' missing in `Match' block.");
258 status = -1;
259 }
261 break;
262 } /* while (status == 0) */
264 if (status != 0)
265 {
266 cmc_web_match_free (match);
267 return (status);
268 }
270 match->match = match_create_simple (match->regex, match->exclude_regex,
271 match->dstype);
272 if (match->match == NULL)
273 {
274 ERROR ("memcachec plugin: tail_match_add_match_simple failed.");
275 cmc_web_match_free (match);
276 return (-1);
277 }
278 else
279 {
280 web_match_t *prev;
282 prev = page->matches;
283 while ((prev != NULL) && (prev->next != NULL))
284 prev = prev->next;
286 if (prev == NULL)
287 page->matches = match;
288 else
289 prev->next = match;
290 }
292 return (0);
293 } /* }}} int cmc_config_add_match */
295 static int cmc_config_add_page (oconfig_item_t *ci) /* {{{ */
296 {
297 web_page_t *page;
298 int status;
299 int i;
301 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
302 {
303 WARNING ("memcachec plugin: `Page' blocks need exactly one string argument.");
304 return (-1);
305 }
307 page = calloc (1, sizeof (*page));
308 if (page == NULL)
309 {
310 ERROR ("memcachec plugin: calloc failed.");
311 return (-1);
312 }
313 page->server = NULL;
314 page->key = NULL;
316 page->instance = strdup (ci->values[0].value.string);
317 if (page->instance == NULL)
318 {
319 ERROR ("memcachec plugin: strdup failed.");
320 sfree (page);
321 return (-1);
322 }
324 /* Process all children */
325 status = 0;
326 for (i = 0; i < ci->children_num; i++)
327 {
328 oconfig_item_t *child = ci->children + i;
330 if (strcasecmp ("Server", child->key) == 0)
331 status = cmc_config_add_string ("Server", &page->server, child);
332 else if (strcasecmp ("Key", child->key) == 0)
333 status = cmc_config_add_string ("Key", &page->key, child);
334 else if (strcasecmp ("Match", child->key) == 0)
335 /* Be liberal with failing matches => don't set `status'. */
336 cmc_config_add_match (page, child);
337 else
338 {
339 WARNING ("memcachec plugin: Option `%s' not allowed here.", child->key);
340 status = -1;
341 }
343 if (status != 0)
344 break;
345 } /* for (i = 0; i < ci->children_num; i++) */
347 /* Additionial sanity checks and libmemcached initialization. */
348 while (status == 0)
349 {
350 if (page->server == NULL)
351 {
352 WARNING ("memcachec plugin: `Server' missing in `Page' block.");
353 status = -1;
354 }
356 if (page->key == NULL)
357 {
358 WARNING ("memcachec plugin: `Key' missing in `Page' block.");
359 status = -1;
360 }
362 if (page->matches == NULL)
363 {
364 assert (page->instance != NULL);
365 WARNING ("memcachec plugin: No (valid) `Match' block "
366 "within `Page' block `%s'.", page->instance);
367 status = -1;
368 }
370 if (status == 0)
371 status = cmc_page_init_memc (page);
373 break;
374 } /* while (status == 0) */
376 if (status != 0)
377 {
378 cmc_web_page_free (page);
379 return (status);
380 }
382 /* Add the new page to the linked list */
383 if (pages_g == NULL)
384 pages_g = page;
385 else
386 {
387 web_page_t *prev;
389 prev = pages_g;
390 while ((prev != NULL) && (prev->next != NULL))
391 prev = prev->next;
392 prev->next = page;
393 }
395 return (0);
396 } /* }}} int cmc_config_add_page */
398 static int cmc_config (oconfig_item_t *ci) /* {{{ */
399 {
400 int success;
401 int errors;
402 int status;
403 int i;
405 success = 0;
406 errors = 0;
408 for (i = 0; i < ci->children_num; i++)
409 {
410 oconfig_item_t *child = ci->children + i;
412 if (strcasecmp ("Page", child->key) == 0)
413 {
414 status = cmc_config_add_page (child);
415 if (status == 0)
416 success++;
417 else
418 errors++;
419 }
420 else
421 {
422 WARNING ("memcachec plugin: Option `%s' not allowed here.", child->key);
423 errors++;
424 }
425 }
427 if ((success == 0) && (errors > 0))
428 {
429 ERROR ("memcachec plugin: All statements failed.");
430 return (-1);
431 }
433 return (0);
434 } /* }}} int cmc_config */
436 static int cmc_init (void) /* {{{ */
437 {
438 if (pages_g == NULL)
439 {
440 INFO ("memcachec plugin: No pages have been defined.");
441 return (-1);
442 }
443 return (0);
444 } /* }}} int cmc_init */
446 static void cmc_submit (const web_page_t *wp, const web_match_t *wm, /* {{{ */
447 const cu_match_value_t *mv)
448 {
449 value_t values[1];
450 value_list_t vl = VALUE_LIST_INIT;
452 values[0] = mv->value;
454 vl.values = values;
455 vl.values_len = 1;
456 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
457 sstrncpy (vl.plugin, "memcachec", sizeof (vl.plugin));
458 sstrncpy (vl.plugin_instance, wp->instance, sizeof (vl.plugin_instance));
459 sstrncpy (vl.type, wm->type, sizeof (vl.type));
460 sstrncpy (vl.type_instance, wm->instance, sizeof (vl.type_instance));
462 plugin_dispatch_values (&vl);
463 } /* }}} void cmc_submit */
465 static int cmc_read_page (web_page_t *wp) /* {{{ */
466 {
467 web_match_t *wm;
468 memcached_return rc;
469 size_t string_length;
470 uint32_t flags;
471 int status;
473 if (wp->memc == NULL)
474 return (-1);
476 wp->buffer = memcached_get (wp->memc, wp->key, strlen (wp->key),
477 &string_length, &flags, &rc);
478 if (rc != MEMCACHED_SUCCESS)
479 {
480 ERROR ("memcachec plugin: memcached_get failed: %s",
481 memcached_strerror (wp->memc, rc));
482 return (-1);
483 }
485 for (wm = wp->matches; wm != NULL; wm = wm->next)
486 {
487 cu_match_value_t *mv;
489 status = match_apply (wm->match, wp->buffer);
490 if (status != 0)
491 {
492 WARNING ("memcachec plugin: match_apply failed.");
493 continue;
494 }
496 mv = match_get_user_data (wm->match);
497 if (mv == NULL)
498 {
499 WARNING ("memcachec plugin: match_get_user_data returned NULL.");
500 continue;
501 }
503 cmc_submit (wp, wm, mv);
504 match_value_reset (mv);
505 } /* for (wm = wp->matches; wm != NULL; wm = wm->next) */
507 sfree (wp->buffer);
509 return (0);
510 } /* }}} int cmc_read_page */
512 static int cmc_read (void) /* {{{ */
513 {
514 web_page_t *wp;
516 for (wp = pages_g; wp != NULL; wp = wp->next)
517 cmc_read_page (wp);
519 return (0);
520 } /* }}} int cmc_read */
522 static int cmc_shutdown (void) /* {{{ */
523 {
524 cmc_web_page_free (pages_g);
525 pages_g = NULL;
527 return (0);
528 } /* }}} int cmc_shutdown */
530 void module_register (void)
531 {
532 plugin_register_complex_config ("memcachec", cmc_config);
533 plugin_register_init ("memcachec", cmc_init);
534 plugin_register_read ("memcachec", cmc_read);
535 plugin_register_shutdown ("memcachec", cmc_shutdown);
536 } /* void module_register */
538 /* vim: set sw=2 sts=2 et fdm=marker : */