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
44 /* Redis plugin configuration example:
45 *
46 * <Plugin redis>
47 * <Node "mynode">
48 * Host "localhost"
49 * Port "6379"
50 * Timeout 2
51 * Password "foobar"
52 * </Node>
53 * </Plugin>
54 */
56 struct redis_node_s;
57 typedef struct redis_node_s redis_node_t;
58 struct redis_node_s
59 {
60 char name[MAX_REDIS_NODE_NAME];
61 char host[HOST_NAME_MAX];
62 char passwd[MAX_REDIS_PASSWD_LENGTH];
63 int port;
64 struct timeval timeout;
66 redis_node_t *next;
67 };
69 static redis_node_t *nodes_head = NULL;
71 static int redis_node_add (const redis_node_t *rn) /* {{{ */
72 {
73 redis_node_t *rn_copy;
74 redis_node_t *rn_ptr;
76 /* Check for duplicates first */
77 for (rn_ptr = nodes_head; rn_ptr != NULL; rn_ptr = rn_ptr->next)
78 if (strcmp (rn->name, rn_ptr->name) == 0)
79 break;
81 if (rn_ptr != NULL)
82 {
83 ERROR ("redis plugin: A node with the name `%s' already exists.",
84 rn->name);
85 return (-1);
86 }
88 rn_copy = malloc (sizeof (*rn_copy));
89 if (rn_copy == NULL)
90 {
91 ERROR ("redis plugin: malloc failed adding redis_node to the tree.");
92 return (-1);
93 }
95 memcpy (rn_copy, rn, sizeof (*rn_copy));
96 rn_copy->next = NULL;
98 DEBUG ("redis plugin: Adding node \"%s\".", rn->name);
100 if (nodes_head == NULL)
101 nodes_head = rn_copy;
102 else
103 {
104 rn_ptr = nodes_head;
105 while (rn_ptr->next != NULL)
106 rn_ptr = rn_ptr->next;
107 rn_ptr->next = rn_copy;
108 }
110 return (0);
111 } /* }}} */
114 static int redis_config_node (oconfig_item_t *ci) /* {{{ */
115 {
116 redis_node_t rn;
117 int i;
118 int status;
119 int timeout;
121 memset (&rn, 0, sizeof (rn));
122 sstrncpy (rn.host, REDIS_DEF_HOST, sizeof (rn.host));
123 rn.port = REDIS_DEF_PORT;
124 rn.timeout.tv_usec = REDIS_DEF_TIMEOUT;
126 status = cf_util_get_string_buffer (ci, rn.name, sizeof (rn.name));
127 if (status != 0)
128 return (status);
130 for (i = 0; i < ci->children_num; i++)
131 {
132 oconfig_item_t *option = ci->children + i;
134 if (strcasecmp ("Host", option->key) == 0)
135 status = cf_util_get_string_buffer (option, rn.host, sizeof (rn.host));
136 else if (strcasecmp ("Port", option->key) == 0)
137 {
138 status = cf_util_get_port_number (option);
139 if (status > 0)
140 {
141 rn.port = status;
142 status = 0;
143 }
144 }
145 else if (strcasecmp ("Timeout", option->key) == 0)
146 {
147 status = cf_util_get_int (option, &timeout);
148 if (status == 0) rn.timeout.tv_usec = timeout;
149 }
150 else if (strcasecmp ("Password", option->key) == 0)
151 status = cf_util_get_string_buffer (option, rn.passwd, sizeof (rn.passwd));
152 else
153 WARNING ("redis plugin: Option `%s' not allowed inside a `Node' "
154 "block. I'll ignore this option.", option->key);
156 if (status != 0)
157 break;
158 }
160 if (status != 0)
161 return (status);
163 return (redis_node_add (&rn));
164 } /* }}} int redis_config_node */
166 static int redis_config (oconfig_item_t *ci) /* {{{ */
167 {
168 int i;
170 for (i = 0; i < ci->children_num; i++)
171 {
172 oconfig_item_t *option = ci->children + i;
174 if (strcasecmp ("Node", option->key) == 0)
175 redis_config_node (option);
176 else
177 WARNING ("redis plugin: Option `%s' not allowed in redis"
178 " configuration. It will be ignored.", option->key);
179 }
181 if (nodes_head == NULL)
182 {
183 ERROR ("redis plugin: No valid node configuration could be found.");
184 return (ENOENT);
185 }
187 return (0);
188 } /* }}} */
190 __attribute__ ((nonnull(2)))
191 static void redis_submit (char *plugin_instance,
192 const char *type, const char *type_instance,
193 value_t value) /* {{{ */
194 {
195 value_t values[1];
196 value_list_t vl = VALUE_LIST_INIT;
198 values[0] = value;
200 vl.values = values;
201 vl.values_len = 1;
202 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
203 sstrncpy (vl.plugin, "redis", sizeof (vl.plugin));
204 if (plugin_instance != NULL)
205 sstrncpy (vl.plugin_instance, plugin_instance,
206 sizeof (vl.plugin_instance));
207 sstrncpy (vl.type, type, sizeof (vl.type));
208 if (type_instance != NULL)
209 sstrncpy (vl.type_instance, type_instance,
210 sizeof (vl.type_instance));
212 plugin_dispatch_values (&vl);
213 } /* }}} */
215 static int redis_init (void) /* {{{ */
216 {
217 redis_node_t rn = {
218 .name = "default",
219 .host = REDIS_DEF_HOST,
220 .port = REDIS_DEF_PORT,
221 .timeout.tv_sec = 0,
222 .timeout.tv_usec = REDIS_DEF_TIMEOUT,
223 .next = NULL
224 };
226 if (nodes_head == NULL)
227 redis_node_add (&rn);
229 return (0);
230 } /* }}} int redis_init */
232 int redis_handle_info (char *node, char const *info_line, char const *type, char const *type_instance, char const *field_name, int ds_type) /* {{{ */
233 {
234 char *str = strstr (info_line, field_name);
235 static char buf[MAX_REDIS_VAL_SIZE];
236 value_t val;
237 if (str)
238 {
239 int i;
241 str += strlen (field_name) + 1; /* also skip the ':' */
242 for(i=0;(*str && (isdigit(*str) || *str == '.'));i++,str++)
243 buf[i] = *str;
244 buf[i] ='\0';
246 if(parse_value (buf, &val, ds_type) == -1)
247 {
248 WARNING ("redis plugin: Unable to parse field `%s'.", field_name);
249 return (-1);
250 }
252 redis_submit (node, type, type_instance, val);
253 return (0);
254 }
255 return (-1);
257 } /* }}} int redis_handle_info */
259 static int redis_read (void) /* {{{ */
260 {
261 redis_node_t *rn;
263 for (rn = nodes_head; rn != NULL; rn = rn->next)
264 {
265 redisContext *rh;
266 redisReply *rr;
268 DEBUG ("redis plugin: querying info from node `%s' (%s:%d).", rn->name, rn->host, rn->port);
270 rh = redisConnectWithTimeout ((char *)rn->host, rn->port, rn->timeout);
271 if (rh == NULL)
272 {
273 ERROR ("redis plugin: unable to connect to node `%s' (%s:%d).", rn->name, rn->host, rn->port);
274 continue;
275 }
277 if (strlen (rn->passwd) > 0)
278 {
279 DEBUG ("redis plugin: authenticanting node `%s' passwd(%s).", rn->name, rn->passwd);
280 rr = redisCommand (rh, "AUTH %s", rn->passwd);
282 if (rr == NULL || rr->type != REDIS_REPLY_STATUS)
283 {
284 WARNING ("redis plugin: unable to authenticate on node `%s'.", rn->name);
285 if (rr != NULL)
286 freeReplyObject (rr);
288 redisFree (rh);
289 continue;
290 }
291 }
293 if ((rr = redisCommand(rh, "INFO")) == NULL)
294 {
295 WARNING ("redis plugin: unable to connect to node `%s'.", rn->name);
296 redisFree (rh);
297 continue;
298 }
300 redis_handle_info (rn->name, rr->str, "uptime", NULL, "uptime_in_seconds", DS_TYPE_GAUGE);
301 redis_handle_info (rn->name, rr->str, "current_connections", "clients", "connected_clients", DS_TYPE_GAUGE);
302 redis_handle_info (rn->name, rr->str, "blocked_clients", NULL, "blocked_clients", DS_TYPE_GAUGE);
303 redis_handle_info (rn->name, rr->str, "memory", NULL, "used_memory", DS_TYPE_GAUGE);
304 redis_handle_info (rn->name, rr->str, "memory_lua", NULL, "used_memory_lua", DS_TYPE_GAUGE);
305 /* changes_since_last_save: Deprecated in redis version 2.6 and above */
306 redis_handle_info (rn->name, rr->str, "volatile_changes", NULL, "changes_since_last_save", DS_TYPE_GAUGE);
307 redis_handle_info (rn->name, rr->str, "total_connections", NULL, "total_connections_received", DS_TYPE_DERIVE);
308 redis_handle_info (rn->name, rr->str, "total_operations", NULL, "total_commands_processed", DS_TYPE_DERIVE);
309 redis_handle_info (rn->name, rr->str, "expired_keys", NULL, "expired_keys", DS_TYPE_GAUGE);
310 redis_handle_info (rn->name, rr->str, "pubsub", "channels", "pubsub_channels", DS_TYPE_GAUGE);
311 redis_handle_info (rn->name, rr->str, "pubsub", "patterns", "pubsub_patterns", DS_TYPE_GAUGE);
312 redis_handle_info (rn->name, rr->str, "current_connections", "slaves", "connected_slaves", DS_TYPE_GAUGE);
314 freeReplyObject (rr);
315 redisFree (rh);
316 }
318 return 0;
319 }
320 /* }}} */
322 void module_register (void) /* {{{ */
323 {
324 plugin_register_complex_config ("redis", redis_config);
325 plugin_register_init ("redis", redis_init);
326 plugin_register_read ("redis", redis_read);
327 /* TODO: plugin_register_write: one redis list per value id with
328 * X elements */
329 }
330 /* }}} */
332 /* vim: set sw=2 sts=2 et fdm=marker : */