59973b0b09bf32ef374e70d35443621acc42853b
1 /**
2 * collectd - src/memcached.c, based on src/hddtemp.c
3 * Copyright (C) 2007 Antony Dovgal
4 * Copyright (C) 2007-2012 Florian Forster
5 * Copyright (C) 2009 Doug MacEachern
6 * Copyright (C) 2009 Franck Lombardi
7 * Copyright (C) 2012 Nicolas Szalay
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 *
23 * Authors:
24 * Antony Dovgal <tony at daylessday dot org>
25 * Florian octo Forster <octo at collectd.org>
26 * Doug MacEachern <dougm at hyperic.com>
27 * Franck Lombardi
28 * Nicolas Szalay
29 **/
31 #include "collectd.h"
32 #include "common.h"
33 #include "plugin.h"
34 #include "configfile.h"
36 #include <netdb.h>
37 #include <sys/socket.h>
38 #include <sys/un.h>
39 #include <netinet/in.h>
40 #include <netinet/tcp.h>
42 #define MEMCACHED_DEF_HOST "127.0.0.1"
43 #define MEMCACHED_DEF_PORT "11211"
45 struct memcached_s
46 {
47 char *name;
48 char *socket;
49 char *host;
50 char *port;
51 };
52 typedef struct memcached_s memcached_t;
54 static _Bool memcached_have_instances = 0;
56 static void memcached_free (memcached_t *st)
57 {
58 if (st == NULL)
59 return;
61 sfree (st->name);
62 sfree (st->socket);
63 sfree (st->host);
64 sfree (st->port);
65 }
67 static int memcached_connect_unix (memcached_t *st)
68 {
69 struct sockaddr_un serv_addr;
70 int fd;
72 memset (&serv_addr, 0, sizeof (serv_addr));
73 serv_addr.sun_family = AF_UNIX;
74 sstrncpy (serv_addr.sun_path, st->socket,
75 sizeof (serv_addr.sun_path));
77 /* create our socket descriptor */
78 fd = socket (AF_UNIX, SOCK_STREAM, 0);
79 if (fd < 0)
80 {
81 char errbuf[1024];
82 ERROR ("memcached: memcached_connect_unix: socket(2) failed: %s",
83 sstrerror (errno, errbuf, sizeof (errbuf)));
84 return (-1);
85 }
87 return (fd);
88 } /* int memcached_connect_unix */
90 static int memcached_connect_inet (memcached_t *st)
91 {
92 char *host;
93 char *port;
95 struct addrinfo ai_hints;
96 struct addrinfo *ai_list, *ai_ptr;
97 int status;
98 int fd = -1;
100 memset (&ai_hints, 0, sizeof (ai_hints));
101 ai_hints.ai_flags = 0;
102 #ifdef AI_ADDRCONFIG
103 ai_hints.ai_flags |= AI_ADDRCONFIG;
104 #endif
105 ai_hints.ai_family = AF_UNSPEC;
106 ai_hints.ai_socktype = SOCK_STREAM;
107 ai_hints.ai_protocol = 0;
109 host = (st->host != NULL) ? st->host : MEMCACHED_DEF_HOST;
110 port = (st->port != NULL) ? st->port : MEMCACHED_DEF_PORT;
112 ai_list = NULL;
113 status = getaddrinfo (host, port, &ai_hints, &ai_list);
114 if (status != 0)
115 {
116 char errbuf[1024];
117 ERROR ("memcached: memcached_connect_inet: getaddrinfo(%s,%s) failed: %s",
118 host, port,
119 (status == EAI_SYSTEM)
120 ? sstrerror (errno, errbuf, sizeof (errbuf))
121 : gai_strerror (status));
122 return (-1);
123 }
125 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
126 {
127 /* create our socket descriptor */
128 fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
129 if (fd < 0)
130 {
131 char errbuf[1024];
132 WARNING ("memcached: memcached_connect_inet: socket(2) failed: %s",
133 sstrerror (errno, errbuf, sizeof (errbuf)));
134 continue;
135 }
137 /* connect to the memcached daemon */
138 status = (int) connect (fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
139 if (status != 0)
140 {
141 shutdown (fd, SHUT_RDWR);
142 close (fd);
143 fd = -1;
144 continue;
145 }
147 /* A socket could be opened and connecting succeeded. We're done. */
148 break;
149 }
151 freeaddrinfo (ai_list);
152 return (fd);
153 } /* int memcached_connect_inet */
155 static int memcached_connect (memcached_t *st)
156 {
157 if (st->socket != NULL)
158 return (memcached_connect_unix (st));
159 else
160 return (memcached_connect_inet (st));
161 }
163 static int memcached_query_daemon (char *buffer, size_t buffer_size, memcached_t *st)
164 {
165 int fd = -1;
166 int status;
167 size_t buffer_fill;
169 fd = memcached_connect (st);
170 if (fd < 0) {
171 ERROR ("memcached: Could not connect to daemon.");
172 return -1;
173 }
175 status = (int) swrite (fd, "stats\r\n", strlen ("stats\r\n"));
176 if (status != 0)
177 {
178 char errbuf[1024];
179 ERROR ("memcached plugin: write(2) failed: %s",
180 sstrerror (errno, errbuf, sizeof (errbuf)));
181 shutdown(fd, SHUT_RDWR);
182 close (fd);
183 return (-1);
184 }
186 /* receive data from the memcached daemon */
187 memset (buffer, 0, buffer_size);
189 buffer_fill = 0;
190 while ((status = (int) recv (fd, buffer + buffer_fill,
191 buffer_size - buffer_fill, /* flags = */ 0)) != 0)
192 {
193 char const end_token[5] = {'E', 'N', 'D', '\r', '\n'};
194 if (status < 0)
195 {
196 char errbuf[1024];
198 if ((errno == EAGAIN) || (errno == EINTR))
199 continue;
201 ERROR ("memcached: Error reading from socket: %s",
202 sstrerror (errno, errbuf, sizeof (errbuf)));
203 shutdown(fd, SHUT_RDWR);
204 close (fd);
205 return (-1);
206 }
208 buffer_fill += (size_t) status;
209 if (buffer_fill > buffer_size)
210 {
211 buffer_fill = buffer_size;
212 WARNING ("memcached plugin: Message was truncated.");
213 break;
214 }
216 /* If buffer ends in end_token, we have all the data. */
217 if (memcmp (buffer + buffer_fill - sizeof (end_token),
218 end_token, sizeof (end_token)) == 0)
219 break;
220 } /* while (recv) */
222 status = 0;
223 if (buffer_fill == 0)
224 {
225 WARNING ("memcached plugin: No data returned by memcached.");
226 status = -1;
227 }
229 shutdown(fd, SHUT_RDWR);
230 close(fd);
231 return (status);
232 } /* int memcached_query_daemon */
234 static void memcached_init_vl (value_list_t *vl, memcached_t const *st)
235 {
236 sstrncpy (vl->plugin, "memcached", sizeof (vl->plugin));
237 if (strcmp (st->name, "__legacy__") == 0) /* legacy mode */
238 {
239 sstrncpy (vl->host, hostname_g, sizeof (vl->host));
240 }
241 else
242 {
243 if (st->socket != NULL)
244 sstrncpy (vl->host, hostname_g, sizeof (vl->host));
245 else
246 sstrncpy (vl->host,
247 (st->host != NULL) ? st->host : MEMCACHED_DEF_HOST,
248 sizeof (vl->host));
249 sstrncpy (vl->plugin_instance, st->name, sizeof (vl->plugin_instance));
250 }
251 }
253 static void submit_derive (const char *type, const char *type_inst,
254 derive_t value, memcached_t *st)
255 {
256 value_t values[1];
257 value_list_t vl = VALUE_LIST_INIT;
258 memcached_init_vl (&vl, st);
260 values[0].derive = value;
262 vl.values = values;
263 vl.values_len = 1;
264 sstrncpy (vl.type, type, sizeof (vl.type));
265 if (type_inst != NULL)
266 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
268 plugin_dispatch_values (&vl);
269 }
271 static void submit_derive2 (const char *type, const char *type_inst,
272 derive_t value0, derive_t value1, memcached_t *st)
273 {
274 value_t values[2];
275 value_list_t vl = VALUE_LIST_INIT;
276 memcached_init_vl (&vl, st);
278 values[0].derive = value0;
279 values[1].derive = value1;
281 vl.values = values;
282 vl.values_len = 2;
283 sstrncpy (vl.type, type, sizeof (vl.type));
284 if (type_inst != NULL)
285 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
287 plugin_dispatch_values (&vl);
288 }
290 static void submit_gauge (const char *type, const char *type_inst,
291 gauge_t value, memcached_t *st)
292 {
293 value_t values[1];
294 value_list_t vl = VALUE_LIST_INIT;
295 memcached_init_vl (&vl, st);
297 values[0].gauge = value;
299 vl.values = values;
300 vl.values_len = 1;
301 sstrncpy (vl.type, type, sizeof (vl.type));
302 if (type_inst != NULL)
303 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
305 plugin_dispatch_values (&vl);
306 }
308 static void submit_gauge2 (const char *type, const char *type_inst,
309 gauge_t value0, gauge_t value1, memcached_t *st)
310 {
311 value_t values[2];
312 value_list_t vl = VALUE_LIST_INIT;
313 memcached_init_vl (&vl, st);
315 values[0].gauge = value0;
316 values[1].gauge = value1;
318 vl.values = values;
319 vl.values_len = 2;
320 sstrncpy (vl.type, type, sizeof (vl.type));
321 if (type_inst != NULL)
322 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
324 plugin_dispatch_values (&vl);
325 }
327 static int memcached_read (user_data_t *user_data)
328 {
329 char buf[4096];
330 char *fields[3];
331 char *ptr;
332 char *line;
333 char *saveptr;
334 int fields_num;
336 gauge_t bytes_used = NAN;
337 gauge_t bytes_total = NAN;
338 gauge_t hits = NAN;
339 gauge_t gets = NAN;
340 derive_t rusage_user = 0;
341 derive_t rusage_syst = 0;
342 derive_t octets_rx = 0;
343 derive_t octets_tx = 0;
345 memcached_t *st;
346 st = user_data->data;
348 /* get data from daemon */
349 if (memcached_query_daemon (buf, sizeof (buf), st) < 0) {
350 return -1;
351 }
353 #define FIELD_IS(cnst) \
354 (((sizeof(cnst) - 1) == name_len) && (strcmp (cnst, fields[1]) == 0))
356 ptr = buf;
357 saveptr = NULL;
358 while ((line = strtok_r (ptr, "\n\r", &saveptr)) != NULL)
359 {
360 int name_len;
362 ptr = NULL;
364 fields_num = strsplit(line, fields, 3);
365 if (fields_num != 3)
366 continue;
368 name_len = strlen(fields[1]);
369 if (name_len == 0)
370 continue;
372 /*
373 * For an explanation on these fields please refer to
374 * <http://code.sixapart.com/svn/memcached/trunk/server/doc/protocol.txt>
375 */
377 /*
378 * CPU time consumed by the memcached process
379 */
380 if (FIELD_IS ("rusage_user"))
381 {
382 rusage_user = atoll (fields[2]);
383 }
384 else if (FIELD_IS ("rusage_system"))
385 {
386 rusage_syst = atoll(fields[2]);
387 }
389 /*
390 * Number of threads of this instance
391 */
392 else if (FIELD_IS ("threads"))
393 {
394 submit_gauge2 ("ps_count", NULL, NAN, atof (fields[2]), st);
395 }
397 /*
398 * Number of items stored
399 */
400 else if (FIELD_IS ("curr_items"))
401 {
402 submit_gauge ("memcached_items", "current", atof (fields[2]), st);
403 }
405 /*
406 * Number of bytes used and available (total - used)
407 */
408 else if (FIELD_IS ("bytes"))
409 {
410 bytes_used = atof (fields[2]);
411 }
412 else if (FIELD_IS ("limit_maxbytes"))
413 {
414 bytes_total = atof(fields[2]);
415 }
417 /*
418 * Connections
419 */
420 else if (FIELD_IS ("curr_connections"))
421 {
422 submit_gauge ("memcached_connections", "current", atof (fields[2]), st);
423 }
425 /*
426 * Commands
427 */
428 else if ((name_len > 4) && (strncmp (fields[1], "cmd_", 4) == 0))
429 {
430 const char *name = fields[1] + 4;
431 submit_derive ("memcached_command", name, atoll (fields[2]), st);
432 if (strcmp (name, "get") == 0)
433 gets = atof (fields[2]);
434 }
436 /*
437 * Operations on the cache, i. e. cache hits, cache misses and evictions of items
438 */
439 else if (FIELD_IS ("get_hits"))
440 {
441 submit_derive ("memcached_ops", "hits", atoll (fields[2]), st);
442 hits = atof (fields[2]);
443 }
444 else if (FIELD_IS ("get_misses"))
445 {
446 submit_derive ("memcached_ops", "misses", atoll (fields[2]), st);
447 }
448 else if (FIELD_IS ("evictions"))
449 {
450 submit_derive ("memcached_ops", "evictions", atoll (fields[2]), st);
451 }
453 /*
454 * Network traffic
455 */
456 else if (FIELD_IS ("bytes_read"))
457 {
458 octets_rx = atoll (fields[2]);
459 }
460 else if (FIELD_IS ("bytes_written"))
461 {
462 octets_tx = atoll (fields[2]);
463 }
464 } /* while ((line = strtok_r (ptr, "\n\r", &saveptr)) != NULL) */
466 if (!isnan (bytes_used) && !isnan (bytes_total) && (bytes_used <= bytes_total))
467 submit_gauge2 ("df", "cache", bytes_used, bytes_total - bytes_used, st);
469 if ((rusage_user != 0) || (rusage_syst != 0))
470 submit_derive2 ("ps_cputime", NULL, rusage_user, rusage_syst, st);
472 if ((octets_rx != 0) || (octets_tx != 0))
473 submit_derive2 ("memcached_octets", NULL, octets_rx, octets_tx, st);
475 if (!isnan (gets) && !isnan (hits))
476 {
477 gauge_t rate = NAN;
479 if (gets != 0.0)
480 rate = 100.0 * hits / gets;
482 submit_gauge ("percent", "hitratio", rate, st);
483 }
485 return 0;
486 } /* int memcached_read */
488 static int memcached_add_read_callback (memcached_t *st)
489 {
490 user_data_t ud;
491 char callback_name[3*DATA_MAX_NAME_LEN];
492 int status;
494 memset (&ud, 0, sizeof (ud));
495 ud.data = st;
496 ud.free_func = (void *) memcached_free;
498 assert (st->name != NULL);
499 ssnprintf (callback_name, sizeof (callback_name), "memcached/%s", st->name);
501 status = plugin_register_complex_read (/* group = */ "memcached",
502 /* name = */ callback_name,
503 /* callback = */ memcached_read,
504 /* interval = */ NULL,
505 /* user_data = */ &ud);
506 return (status);
507 } /* int memcached_add_read_callback */
509 /* Configuration handling functiions
510 * <Plugin memcached>
511 * <Instance "instance_name">
512 * Host foo.zomg.com
513 * Port "1234"
514 * </Instance>
515 * </Plugin>
516 */
517 static int config_add_instance(oconfig_item_t *ci)
518 {
519 memcached_t *st;
520 int i;
521 int status = 0;
523 /* Disable automatic generation of default instance in the init callback. */
524 memcached_have_instances = 1;
526 st = malloc (sizeof (*st));
527 if (st == NULL)
528 {
529 ERROR ("memcached plugin: malloc failed.");
530 return (-1);
531 }
533 memset (st, 0, sizeof (*st));
534 st->name = NULL;
535 st->socket = NULL;
536 st->host = NULL;
537 st->port = NULL;
539 if (strcasecmp (ci->key, "Plugin") == 0) /* default instance */
540 st->name = sstrdup ("__legacy__");
541 else /* <Instance /> block */
542 status = cf_util_get_string (ci, &st->name);
543 if (status != 0)
544 {
545 sfree (st);
546 return (status);
547 }
548 assert (st->name != NULL);
550 for (i = 0; i < ci->children_num; i++)
551 {
552 oconfig_item_t *child = ci->children + i;
554 if (strcasecmp ("Socket", child->key) == 0)
555 status = cf_util_get_string (child, &st->socket);
556 else if (strcasecmp ("Host", child->key) == 0)
557 status = cf_util_get_string (child, &st->host);
558 else if (strcasecmp ("Port", child->key) == 0)
559 status = cf_util_get_service (child, &st->port);
560 else
561 {
562 WARNING ("memcached plugin: Option `%s' not allowed here.",
563 child->key);
564 status = -1;
565 }
567 if (status != 0)
568 break;
569 }
571 if (status == 0)
572 status = memcached_add_read_callback (st);
574 if (status != 0)
575 {
576 memcached_free(st);
577 return (-1);
578 }
580 return (0);
581 }
583 static int memcached_config (oconfig_item_t *ci)
584 {
585 int status = 0;
586 _Bool have_instance_block = 0;
587 int i;
589 for (i = 0; i < ci->children_num; i++)
590 {
591 oconfig_item_t *child = ci->children + i;
593 if (strcasecmp ("Instance", child->key) == 0)
594 {
595 config_add_instance (child);
596 have_instance_block = 1;
597 }
598 else if (!have_instance_block)
599 {
600 /* Non-instance option: Assume legacy configuration (without <Instance />
601 * blocks) and call config_add_instance() with the <Plugin /> block. */
602 return (config_add_instance (ci));
603 }
604 else
605 WARNING ("memcached plugin: The configuration option "
606 "\"%s\" is not allowed here. Did you "
607 "forget to add an <Instance /> block "
608 "around the configuration?",
609 child->key);
610 } /* for (ci->children) */
612 return (status);
613 }
615 static int memcached_init (void)
616 {
617 memcached_t *st;
618 int status;
620 if (memcached_have_instances)
621 return (0);
623 /* No instances were configured, lets start a default instance. */
624 st = malloc (sizeof (*st));
625 if (st == NULL)
626 return (ENOMEM);
627 memset (st, 0, sizeof (*st));
628 st->name = sstrdup ("__legacy__");
629 st->socket = NULL;
630 st->host = NULL;
631 st->port = NULL;
633 status = memcached_add_read_callback (st);
634 if (status == 0)
635 memcached_have_instances = 1;
636 else
637 memcached_free (st);
639 return (status);
640 } /* int memcached_init */
642 void module_register (void)
643 {
644 plugin_register_complex_config ("memcached", memcached_config);
645 plugin_register_init ("memcached", memcached_init);
646 }