forked from collectd/collectd
/
redis.c
311 lines (259 loc) · 8.35 KB
/
redis.c
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/**
* collectd - src/redis.c, based on src/memcached.c
* Copyright (C) 2010 Andrés J. Díaz <ajdiaz@connectical.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
* Andrés J. Díaz <ajdiaz@connectical.com>
**/
#include "collectd.h"
#include "common.h"
#include "plugin.h"
#include "configfile.h"
#include <pthread.h>
#include <credis.h>
#define REDIS_DEF_HOST "localhost"
#define REDIS_DEF_PORT 6379
#define REDIS_DEF_TIMEOUT 2000
#define MAX_REDIS_NODE_NAME 64
/* Redis plugin configuration example:
*
* <Plugin redis>
* <Node "mynode">
* Host "localhost"
* Port "6379"
* Timeout 2000
* </Node>
* </Plugin>
*/
struct redis_node_s;
typedef struct redis_node_s redis_node_t;
struct redis_node_s
{
char name[MAX_REDIS_NODE_NAME];
char host[HOST_NAME_MAX];
int port;
int timeout;
redis_node_t *next;
};
static redis_node_t *nodes_head = NULL;
static int redis_node_add (const redis_node_t *rn) /* {{{ */
{
redis_node_t *rn_copy;
redis_node_t *rn_ptr;
/* Check for duplicates first */
for (rn_ptr = nodes_head; rn_ptr != NULL; rn_ptr = rn_ptr->next)
if (strcmp (rn->name, rn_ptr->name) == 0)
break;
if (rn_ptr != NULL)
{
ERROR ("redis plugin: A node with the name `%s' already exists.",
rn->name);
return (-1);
}
rn_copy = malloc (sizeof (*rn_copy));
if (rn_copy == NULL)
{
ERROR ("redis plugin: malloc failed adding redis_node to the tree.");
return (-1);
}
memcpy (rn_copy, rn, sizeof (*rn_copy));
rn_copy->next = NULL;
DEBUG ("redis plugin: Adding node \"%s\".", rn->name);
if (nodes_head == NULL)
nodes_head = rn_copy;
else
{
rn_ptr = nodes_head;
while (rn_ptr->next != NULL)
rn_ptr = rn_ptr->next;
rn_ptr->next = rn_copy;
}
return (0);
} /* }}} */
static int redis_config_node (oconfig_item_t *ci) /* {{{ */
{
redis_node_t rn;
int i;
int status;
memset (&rn, 0, sizeof (rn));
sstrncpy (rn.host, REDIS_DEF_HOST, sizeof (rn.host));
rn.port = REDIS_DEF_PORT;
rn.timeout = REDIS_DEF_TIMEOUT;
status = cf_util_get_string_buffer (ci, rn.name, sizeof (rn.name));
if (status != 0)
return (status);
for (i = 0; i < ci->children_num; i++)
{
oconfig_item_t *option = ci->children + i;
if (strcasecmp ("Host", option->key) == 0)
status = cf_util_get_string_buffer (option, rn.host, sizeof (rn.host));
else if (strcasecmp ("Port", option->key) == 0)
{
status = cf_util_get_port_number (option);
if (status > 0)
{
rn.port = status;
status = 0;
}
}
else if (strcasecmp ("Timeout", option->key) == 0)
status = cf_util_get_int (option, &rn.timeout);
else
WARNING ("redis plugin: Option `%s' not allowed inside a `Node' "
"block. I'll ignore this option.", option->key);
if (status != 0)
break;
}
if (status != 0)
return (status);
return (redis_node_add (&rn));
} /* }}} int redis_config_node */
static int redis_config (oconfig_item_t *ci) /* {{{ */
{
int i;
for (i = 0; i < ci->children_num; i++)
{
oconfig_item_t *option = ci->children + i;
if (strcasecmp ("Node", option->key) == 0)
redis_config_node (option);
else
WARNING ("redis plugin: Option `%s' not allowed in redis"
" configuration. It will be ignored.", option->key);
}
if (nodes_head == NULL)
{
ERROR ("redis plugin: No valid node configuration could be found.");
return (ENOENT);
}
return (0);
} /* }}} */
__attribute__ ((nonnull(2)))
static void redis_submit_g (char *plugin_instance,
const char *type, const char *type_instance,
gauge_t value) /* {{{ */
{
value_t values[1];
value_list_t vl = VALUE_LIST_INIT;
values[0].gauge = value;
vl.values = values;
vl.values_len = 1;
sstrncpy (vl.host, hostname_g, sizeof (vl.host));
sstrncpy (vl.plugin, "redis", sizeof (vl.plugin));
if (plugin_instance != NULL)
sstrncpy (vl.plugin_instance, plugin_instance,
sizeof (vl.plugin_instance));
sstrncpy (vl.type, type, sizeof (vl.type));
if (type_instance != NULL)
sstrncpy (vl.type_instance, type_instance,
sizeof (vl.type_instance));
plugin_dispatch_values (&vl);
} /* }}} */
__attribute__ ((nonnull(2)))
static void redis_submit_d (char *plugin_instance,
const char *type, const char *type_instance,
derive_t value) /* {{{ */
{
value_t values[1];
value_list_t vl = VALUE_LIST_INIT;
values[0].derive = value;
vl.values = values;
vl.values_len = 1;
sstrncpy (vl.host, hostname_g, sizeof (vl.host));
sstrncpy (vl.plugin, "redis", sizeof (vl.plugin));
if (plugin_instance != NULL)
sstrncpy (vl.plugin_instance, plugin_instance,
sizeof (vl.plugin_instance));
sstrncpy (vl.type, type, sizeof (vl.type));
if (type_instance != NULL)
sstrncpy (vl.type_instance, type_instance,
sizeof (vl.type_instance));
plugin_dispatch_values (&vl);
} /* }}} */
static int redis_init (void) /* {{{ */
{
redis_node_t rn = { "default", REDIS_DEF_HOST, REDIS_DEF_PORT,
REDIS_DEF_TIMEOUT, /* next = */ NULL };
if (nodes_head == NULL)
redis_node_add (&rn);
return (0);
} /* }}} int redis_init */
static int redis_read (void) /* {{{ */
{
redis_node_t *rn;
for (rn = nodes_head; rn != NULL; rn = rn->next)
{
REDIS rh;
REDIS_INFO info;
int status;
DEBUG ("redis plugin: querying info from node `%s' (%s:%d).", rn->name, rn->host, rn->port);
rh = credis_connect (rn->host, rn->port, rn->timeout);
if (rh == NULL)
{
ERROR ("redis plugin: unable to connect to node `%s' (%s:%d).", rn->name, rn->host, rn->port);
continue;
}
memset (&info, 0, sizeof (info));
status = credis_info (rh, &info);
if (status != 0)
{
WARNING ("redis plugin: unable to get info from node `%s'.", rn->name);
credis_close (rh);
continue;
}
/* typedef struct _cr_info {
* char redis_version[CREDIS_VERSION_STRING_SIZE];
* int bgsave_in_progress;
* int connected_clients;
* int connected_slaves;
* unsigned int used_memory;
* long long changes_since_last_save;
* int last_save_time;
* long long total_connections_received;
* long long total_commands_processed;
* int uptime_in_seconds;
* int uptime_in_days;
* int role;
* } REDIS_INFO; */
DEBUG ("redis plugin: received info from node `%s': connected_clients = %d; "
"connected_slaves = %d; used_memory = %lu; changes_since_last_save = %lld; "
"bgsave_in_progress = %d; total_connections_received = %lld; "
"total_commands_processed = %lld; uptime_in_seconds = %ld", rn->name,
info.connected_clients, info.connected_slaves, info.used_memory,
info.changes_since_last_save, info.bgsave_in_progress,
info.total_connections_received, info.total_commands_processed,
info.uptime_in_seconds);
redis_submit_g (rn->name, "current_connections", "clients", info.connected_clients);
redis_submit_g (rn->name, "current_connections", "slaves", info.connected_slaves);
redis_submit_g (rn->name, "memory", "used", info.used_memory);
redis_submit_g (rn->name, "volatile_changes", NULL, info.changes_since_last_save);
redis_submit_d (rn->name, "total_connections", NULL, info.total_connections_received);
redis_submit_d (rn->name, "total_operations", NULL, info.total_commands_processed);
credis_close (rh);
}
return 0;
}
/* }}} */
void module_register (void) /* {{{ */
{
plugin_register_complex_config ("redis", redis_config);
plugin_register_init ("redis", redis_init);
plugin_register_read ("redis", redis_read);
/* TODO: plugin_register_write: one redis list per value id with
* X elements */
}
/* }}} */
/* vim: set sw=2 sts=2 et fdm=marker : */