1 /**
2 * collectd - src/redis.c, based on src/memcached.c
3 * Copyright (C) 2010 Andrés J. Díaz <ajdiaz@connectical.com>
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; either version 2 of the License, or (at your
8 * option) any later version.
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 * Andrés J. Díaz <ajdiaz@connectical.com>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "configfile.h"
28 #include <pthread.h>
29 #include <sys/time.h>
30 #include <hiredis/hiredis.h>
32 #ifndef HOST_NAME_MAX
33 # define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
34 #endif
36 #define REDIS_DEF_HOST "localhost"
37 #define REDIS_DEF_PASSWD ""
38 #define REDIS_DEF_PORT 6379
39 #define REDIS_DEF_TIMEOUT 2000
40 #define MAX_REDIS_NODE_NAME 64
41 #define MAX_REDIS_PASSWD_LENGTH 512
42 #define MAX_REDIS_VAL_SIZE 256
43 #define MAX_REDIS_QUERY 2048
45 /* Redis plugin configuration example:
46 *
47 * <Plugin redis>
48 * <Node "mynode">
49 * Host "localhost"
50 * Port "6379"
51 * Timeout 2
52 * Password "foobar"
53 * </Node>
54 * </Plugin>
55 */
57 struct redis_query_s;
58 typedef struct redis_query_s redis_query_t;
59 struct redis_query_s
60 {
61 char query[MAX_REDIS_QUERY];
62 char type[DATA_MAX_NAME_LEN];
63 char instance[DATA_MAX_NAME_LEN];
64 redis_query_t *next;
65 };
67 struct redis_node_s;
68 typedef struct redis_node_s redis_node_t;
69 struct redis_node_s
70 {
71 char name[MAX_REDIS_NODE_NAME];
72 char host[HOST_NAME_MAX];
73 char passwd[MAX_REDIS_PASSWD_LENGTH];
74 int port;
75 struct timeval timeout;
76 redis_query_t *queries;
78 redis_node_t *next;
79 };
81 static redis_node_t *nodes_head = NULL;
83 static int redis_node_add (const redis_node_t *rn) /* {{{ */
84 {
85 redis_node_t *rn_copy;
86 redis_node_t *rn_ptr;
88 /* Check for duplicates first */
89 for (rn_ptr = nodes_head; rn_ptr != NULL; rn_ptr = rn_ptr->next)
90 if (strcmp (rn->name, rn_ptr->name) == 0)
91 break;
93 if (rn_ptr != NULL)
94 {
95 ERROR ("redis plugin: A node with the name `%s' already exists.",
96 rn->name);
97 return (-1);
98 }
100 rn_copy = malloc (sizeof (*rn_copy));
101 if (rn_copy == NULL)
102 {
103 ERROR ("redis plugin: malloc failed adding redis_node to the tree.");
104 return (-1);
105 }
107 memcpy (rn_copy, rn, sizeof (*rn_copy));
108 rn_copy->next = NULL;
110 DEBUG ("redis plugin: Adding node \"%s\".", rn->name);
112 if (nodes_head == NULL)
113 nodes_head = rn_copy;
114 else
115 {
116 rn_ptr = nodes_head;
117 while (rn_ptr->next != NULL)
118 rn_ptr = rn_ptr->next;
119 rn_ptr->next = rn_copy;
120 }
122 return (0);
123 } /* }}} */
125 static redis_query_t *redis_config_query (oconfig_item_t *ci) /* {{{ */
126 {
127 redis_query_t *rq;
128 int status;
129 int i;
131 rq = calloc(1, sizeof(*rq));
132 if (rq == NULL) {
133 ERROR("redis plugin: calloc failed adding redis_query.");
134 return NULL;
135 }
136 status = cf_util_get_string_buffer(ci, rq->query, sizeof(rq->query));
137 if (status != 0)
138 goto err;
140 /*
141 * Default to a gauge type.
142 */
143 (void)strncpy(rq->type, "gauge", sizeof(rq->type));
144 (void)sstrncpy(rq->instance, rq->query, sizeof(rq->instance));
145 replace_special(rq->instance, sizeof(rq->instance));
147 for (i = 0; i < ci->children_num; i++) {
148 oconfig_item_t *option = ci->children + i;
150 if (strcasecmp("Type", option->key) == 0) {
151 status = cf_util_get_string_buffer(option, rq->type, sizeof(rq->type));
152 } else if (strcasecmp("Instance", option->key) == 0) {
153 status = cf_util_get_string_buffer(option, rq->instance, sizeof(rq->instance));
154 } else {
155 WARNING("redis plugin: unknown configuration option: %s", option->key);
156 status = -1;
157 }
158 if (status != 0)
159 goto err;
160 }
161 return rq;
162 err:
163 free(rq);
164 return NULL;
165 } /* }}} */
167 static int redis_config_node (oconfig_item_t *ci) /* {{{ */
168 {
169 redis_node_t rn;
170 redis_query_t *rq;
171 int i;
172 int status;
173 int timeout;
175 memset (&rn, 0, sizeof (rn));
176 sstrncpy (rn.host, REDIS_DEF_HOST, sizeof (rn.host));
177 rn.port = REDIS_DEF_PORT;
178 rn.timeout.tv_usec = REDIS_DEF_TIMEOUT;
179 rn.queries = NULL;
181 status = cf_util_get_string_buffer (ci, rn.name, sizeof (rn.name));
182 if (status != 0)
183 return (status);
185 for (i = 0; i < ci->children_num; i++)
186 {
187 oconfig_item_t *option = ci->children + i;
189 if (strcasecmp ("Host", option->key) == 0)
190 status = cf_util_get_string_buffer (option, rn.host, sizeof (rn.host));
191 else if (strcasecmp ("Port", option->key) == 0)
192 {
193 status = cf_util_get_port_number (option);
194 if (status > 0)
195 {
196 rn.port = status;
197 status = 0;
198 }
199 }
200 else if (strcasecmp ("Query", option->key) == 0)
201 {
202 rq = redis_config_query(option);
203 if (rq == NULL) {
204 status =1;
205 } else {
206 rq->next = rn.queries;
207 rn.queries = rq;
208 }
209 }
210 else if (strcasecmp ("Timeout", option->key) == 0)
211 {
212 status = cf_util_get_int (option, &timeout);
213 if (status == 0) rn.timeout.tv_usec = timeout;
214 }
215 else if (strcasecmp ("Password", option->key) == 0)
216 status = cf_util_get_string_buffer (option, rn.passwd, sizeof (rn.passwd));
217 else
218 WARNING ("redis plugin: Option `%s' not allowed inside a `Node' "
219 "block. I'll ignore this option.", option->key);
221 if (status != 0)
222 break;
223 }
225 if (status != 0)
226 return (status);
228 return (redis_node_add (&rn));
229 } /* }}} int redis_config_node */
231 static int redis_config (oconfig_item_t *ci) /* {{{ */
232 {
233 int i;
235 for (i = 0; i < ci->children_num; i++)
236 {
237 oconfig_item_t *option = ci->children + i;
239 if (strcasecmp ("Node", option->key) == 0)
240 redis_config_node (option);
241 else
242 WARNING ("redis plugin: Option `%s' not allowed in redis"
243 " configuration. It will be ignored.", option->key);
244 }
246 if (nodes_head == NULL)
247 {
248 ERROR ("redis plugin: No valid node configuration could be found.");
249 return (ENOENT);
250 }
252 return (0);
253 } /* }}} */
255 __attribute__ ((nonnull(2)))
256 static void redis_submit (char *plugin_instance,
257 const char *type, const char *type_instance,
258 value_t value) /* {{{ */
259 {
260 value_t values[1];
261 value_list_t vl = VALUE_LIST_INIT;
263 values[0] = value;
265 vl.values = values;
266 vl.values_len = 1;
267 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
268 sstrncpy (vl.plugin, "redis", sizeof (vl.plugin));
269 if (plugin_instance != NULL)
270 sstrncpy (vl.plugin_instance, plugin_instance,
271 sizeof (vl.plugin_instance));
272 sstrncpy (vl.type, type, sizeof (vl.type));
273 if (type_instance != NULL)
274 sstrncpy (vl.type_instance, type_instance,
275 sizeof (vl.type_instance));
277 plugin_dispatch_values (&vl);
278 } /* }}} */
280 static int redis_init (void) /* {{{ */
281 {
282 redis_node_t rn = {
283 .name = "default",
284 .host = REDIS_DEF_HOST,
285 .port = REDIS_DEF_PORT,
286 .timeout.tv_sec = 0,
287 .timeout.tv_usec = REDIS_DEF_TIMEOUT,
288 .next = NULL
289 };
291 if (nodes_head == NULL)
292 redis_node_add (&rn);
294 return (0);
295 } /* }}} int redis_init */
297 static int redis_handle_info (char *node, char const *info_line, char const *type, char const *type_instance, char const *field_name, int ds_type) /* {{{ */
298 {
299 char *str = strstr (info_line, field_name);
300 static char buf[MAX_REDIS_VAL_SIZE];
301 value_t val;
302 if (str)
303 {
304 int i;
306 str += strlen (field_name) + 1; /* also skip the ':' */
307 for(i=0;(*str && (isdigit((unsigned char)*str) || *str == '.'));i++,str++)
308 buf[i] = *str;
309 buf[i] ='\0';
311 if(parse_value (buf, &val, ds_type) == -1)
312 {
313 WARNING ("redis plugin: Unable to parse field `%s'.", field_name);
314 return (-1);
315 }
317 redis_submit (node, type, type_instance, val);
318 return (0);
319 }
320 return (-1);
322 } /* }}} int redis_handle_info */
324 static int redis_handle_query (redisContext *rh, redis_node_t *rn, redis_query_t *rq) /* {{{ */
325 {
326 redisReply *rr;
327 const data_set_t *ds;
328 value_t val;
330 ds = plugin_get_ds (rq->type);
331 if (!ds) {
332 ERROR ("redis plugin: DataSet `%s' not defined.", rq->type);
333 return (-1);
334 }
336 if (ds->ds_num != 1) {
337 ERROR ("redis plugin: DS `%s' has too many types.", rq->type);
338 return (-1);
339 }
341 if ((rr = redisCommand(rh, rq->query)) == NULL) {
342 WARNING("redis plugin: unable to carry out query `%s'.", rq->query);
343 return (-1);
344 }
346 switch (rr->type) {
347 case REDIS_REPLY_INTEGER:
348 switch (ds->ds[0].type) {
349 case DS_TYPE_COUNTER:
350 val.counter = (counter_t)rr->integer;
351 break;
352 case DS_TYPE_GAUGE:
353 val.gauge = (gauge_t)rr->integer;
354 break;
355 case DS_TYPE_DERIVE:
356 val.gauge = (derive_t)rr->integer;
357 break;
358 case DS_TYPE_ABSOLUTE:
359 val.gauge = (absolute_t)rr->integer;
360 break;
361 }
362 break;
363 case REDIS_REPLY_STRING:
364 if (parse_value (rr->str, &val, ds->ds[0].type) == -1) {
365 WARNING("redis plugin: Unable to parse field `%s'.", rq->type);
366 freeReplyObject (rr);
367 return (-1);
368 }
369 break;
370 default:
371 WARNING("redis plugin: Cannot coerce redis type.");
372 freeReplyObject(rr);
373 return (-1);
374 }
376 redis_submit(rn->name, rq->type, (strlen(rq->instance) >0)?rq->instance:NULL, val);
377 freeReplyObject (rr);
378 return 0;
379 } /* }}} int redis_handle_query */
381 static int redis_read (void) /* {{{ */
382 {
383 redis_node_t *rn;
384 redis_query_t *rq;
386 for (rn = nodes_head; rn != NULL; rn = rn->next)
387 {
388 redisContext *rh;
389 redisReply *rr;
391 DEBUG ("redis plugin: querying info from node `%s' (%s:%d).", rn->name, rn->host, rn->port);
393 rh = redisConnectWithTimeout ((char *)rn->host, rn->port, rn->timeout);
394 if (rh == NULL)
395 {
396 ERROR ("redis plugin: unable to connect to node `%s' (%s:%d).", rn->name, rn->host, rn->port);
397 continue;
398 }
400 if (strlen (rn->passwd) > 0)
401 {
402 DEBUG ("redis plugin: authenticating node `%s' passwd(%s).", rn->name, rn->passwd);
404 if ((rr = redisCommand (rh, "AUTH %s", rn->passwd)) == NULL)
405 {
406 WARNING ("redis plugin: unable to authenticate on node `%s'.", rn->name);
407 goto redis_fail;
408 }
410 if (rr->type != REDIS_REPLY_STATUS)
411 {
412 WARNING ("redis plugin: invalid authentication on node `%s'.", rn->name);
413 goto redis_fail;
414 }
416 freeReplyObject (rr);
417 }
419 if ((rr = redisCommand(rh, "INFO")) == NULL)
420 {
421 WARNING ("redis plugin: unable to get info from node `%s'.", rn->name);
422 goto redis_fail;
423 }
425 redis_handle_info (rn->name, rr->str, "uptime", NULL, "uptime_in_seconds", DS_TYPE_GAUGE);
426 redis_handle_info (rn->name, rr->str, "current_connections", "clients", "connected_clients", DS_TYPE_GAUGE);
427 redis_handle_info (rn->name, rr->str, "blocked_clients", NULL, "blocked_clients", DS_TYPE_GAUGE);
428 redis_handle_info (rn->name, rr->str, "memory", NULL, "used_memory", DS_TYPE_GAUGE);
429 redis_handle_info (rn->name, rr->str, "memory_lua", NULL, "used_memory_lua", DS_TYPE_GAUGE);
430 /* changes_since_last_save: Deprecated in redis version 2.6 and above */
431 redis_handle_info (rn->name, rr->str, "volatile_changes", NULL, "changes_since_last_save", DS_TYPE_GAUGE);
432 redis_handle_info (rn->name, rr->str, "total_connections", NULL, "total_connections_received", DS_TYPE_DERIVE);
433 redis_handle_info (rn->name, rr->str, "total_operations", NULL, "total_commands_processed", DS_TYPE_DERIVE);
434 redis_handle_info (rn->name, rr->str, "expired_keys", NULL, "expired_keys", DS_TYPE_DERIVE);
435 redis_handle_info (rn->name, rr->str, "evicted_keys", NULL, "evicted_keys", DS_TYPE_DERIVE);
436 redis_handle_info (rn->name, rr->str, "pubsub", "channels", "pubsub_channels", DS_TYPE_GAUGE);
437 redis_handle_info (rn->name, rr->str, "pubsub", "patterns", "pubsub_patterns", DS_TYPE_GAUGE);
438 redis_handle_info (rn->name, rr->str, "current_connections", "slaves", "connected_slaves", DS_TYPE_GAUGE);
439 redis_handle_info (rn->name, rr->str, "cache_result", "hits", "keyspace_hits", DS_TYPE_DERIVE);
440 redis_handle_info (rn->name, rr->str, "cache_result", "misses", "keyspace_misses", DS_TYPE_DERIVE);
441 redis_handle_info (rn->name, rr->str, "total_bytes", "input", "total_net_input_bytes", DS_TYPE_DERIVE);
442 redis_handle_info (rn->name, rr->str, "total_bytes", "output", "total_net_output_bytes", DS_TYPE_DERIVE);
444 for (rq = rn->queries; rq != NULL; rq = rq->next)
445 redis_handle_query(rh, rn, rq);
447 redis_fail:
448 if (rr != NULL)
449 freeReplyObject (rr);
450 redisFree (rh);
451 }
453 return 0;
454 }
455 /* }}} */
457 void module_register (void) /* {{{ */
458 {
459 plugin_register_complex_config ("redis", redis_config);
460 plugin_register_init ("redis", redis_init);
461 plugin_register_read ("redis", redis_read);
462 /* TODO: plugin_register_write: one redis list per value id with
463 * X elements */
464 }
465 /* }}} */
467 /* vim: set sw=2 sts=2 et fdm=marker : */