/collectd-4.10.7/src/memcached.c
C | 533 lines | 372 code | 79 blank | 82 comment | 120 complexity | 144accb1379d06d197b5f744cff696e8 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.1
- /**
- * collectd - src/memcached.c, based on src/hddtemp.c
- * Copyright (C) 2007 Antony Dovgal
- * Copyright (C) 2007-2009 Florian Forster
- * Copyright (C) 2009 Doug MacEachern
- * Copyright (C) 2009 Franck Lombardi
- *
- * 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:
- * Antony Dovgal <tony at daylessday dot org>
- * Florian octo Forster <octo at verplant.org>
- * Doug MacEachern <dougm at hyperic.com>
- * Franck Lombardi
- **/
- #include "collectd.h"
- #include "common.h"
- #include "plugin.h"
- #include "configfile.h"
- # include <poll.h>
- # include <netdb.h>
- # include <sys/socket.h>
- # include <sys/un.h>
- # include <netinet/in.h>
- # include <netinet/tcp.h>
- /* Hack to work around the missing define in AIX */
- #ifndef MSG_DONTWAIT
- # define MSG_DONTWAIT MSG_NONBLOCK
- #endif
- #define MEMCACHED_DEF_HOST "127.0.0.1"
- #define MEMCACHED_DEF_PORT "11211"
- #define MEMCACHED_RETRY_COUNT 100
- static const char *config_keys[] =
- {
- "Socket",
- "Host",
- "Port"
- };
- static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
- static char *memcached_socket = NULL;
- static char *memcached_host = NULL;
- static char memcached_port[16];
- static int memcached_query_daemon (char *buffer, int buffer_size) /* {{{ */
- {
- int fd;
- ssize_t status;
- int buffer_fill;
- int i = 0;
- if (memcached_socket != NULL) {
- struct sockaddr_un serv_addr;
- memset (&serv_addr, 0, sizeof (serv_addr));
- serv_addr.sun_family = AF_UNIX;
- sstrncpy (serv_addr.sun_path, memcached_socket,
- sizeof (serv_addr.sun_path));
- /* create our socket descriptor */
- fd = socket (AF_UNIX, SOCK_STREAM, 0);
- if (fd < 0) {
- char errbuf[1024];
- ERROR ("memcached: unix socket: %s", sstrerror (errno, errbuf,
- sizeof (errbuf)));
- return -1;
- }
- /* connect to the memcached daemon */
- status = (ssize_t) connect (fd, (struct sockaddr *) &serv_addr,
- sizeof (serv_addr));
- if (status != 0) {
- shutdown (fd, SHUT_RDWR);
- close (fd);
- fd = -1;
- }
- }
- else { /* if (memcached_socket == NULL) */
- const char *host;
- const char *port;
- struct addrinfo ai_hints;
- struct addrinfo *ai_list, *ai_ptr;
- int ai_return = 0;
- memset (&ai_hints, '\0', sizeof (ai_hints));
- ai_hints.ai_flags = 0;
- #ifdef AI_ADDRCONFIG
- /* ai_hints.ai_flags |= AI_ADDRCONFIG; */
- #endif
- ai_hints.ai_family = AF_INET;
- ai_hints.ai_socktype = SOCK_STREAM;
- ai_hints.ai_protocol = 0;
- host = memcached_host;
- if (host == NULL) {
- host = MEMCACHED_DEF_HOST;
- }
- port = memcached_port;
- if (strlen (port) == 0) {
- port = MEMCACHED_DEF_PORT;
- }
- if ((ai_return = getaddrinfo (host, port, &ai_hints, &ai_list)) != 0) {
- char errbuf[1024];
- ERROR ("memcached: getaddrinfo (%s, %s): %s",
- host, port,
- (ai_return == EAI_SYSTEM)
- ? sstrerror (errno, errbuf, sizeof (errbuf))
- : gai_strerror (ai_return));
- return -1;
- }
- fd = -1;
- for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) {
- /* create our socket descriptor */
- fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
- if (fd < 0) {
- char errbuf[1024];
- ERROR ("memcached: socket: %s", sstrerror (errno, errbuf, sizeof (errbuf)));
- continue;
- }
- /* connect to the memcached daemon */
- status = (ssize_t) connect (fd, (struct sockaddr *) ai_ptr->ai_addr, ai_ptr->ai_addrlen);
- if (status != 0) {
- shutdown (fd, SHUT_RDWR);
- close (fd);
- fd = -1;
- continue;
- }
- /* A socket could be opened and connecting succeeded. We're
- * done. */
- break;
- }
- freeaddrinfo (ai_list);
- }
- if (fd < 0) {
- ERROR ("memcached: Could not connect to daemon.");
- return -1;
- }
- if (send(fd, "stats\r\n", sizeof("stats\r\n") - 1, MSG_DONTWAIT) != (sizeof("stats\r\n") - 1)) {
- ERROR ("memcached: Could not send command to the memcached daemon.");
- return -1;
- }
- {
- struct pollfd p;
- int status;
- memset (&p, 0, sizeof (p));
- p.fd = fd;
- p.events = POLLIN | POLLERR | POLLHUP;
- p.revents = 0;
- status = poll (&p, /* nfds = */ 1, /* timeout = */ 1000 * interval_g);
- if (status <= 0)
- {
- if (status == 0)
- {
- ERROR ("memcached: poll(2) timed out after %i seconds.", interval_g);
- }
- else
- {
- char errbuf[1024];
- ERROR ("memcached: poll(2) failed: %s",
- sstrerror (errno, errbuf, sizeof (errbuf)));
- }
- shutdown (fd, SHUT_RDWR);
- close (fd);
- return (-1);
- }
- }
- /* receive data from the memcached daemon */
- memset (buffer, '\0', buffer_size);
- buffer_fill = 0;
- while ((status = recv (fd, buffer + buffer_fill, buffer_size - buffer_fill, MSG_DONTWAIT)) != 0) {
- if (i > MEMCACHED_RETRY_COUNT) {
- ERROR("recv() timed out");
- break;
- }
- i++;
- if (status == -1) {
- char errbuf[1024];
- if (errno == EAGAIN) {
- continue;
- }
- ERROR ("memcached: Error reading from socket: %s",
- sstrerror (errno, errbuf, sizeof (errbuf)));
- shutdown(fd, SHUT_RDWR);
- close (fd);
- return -1;
- }
- buffer_fill += status;
- if (buffer_fill > 3 && buffer[buffer_fill-5] == 'E' && buffer[buffer_fill-4] == 'N' && buffer[buffer_fill-3] == 'D') {
- /* we got all the data */
- break;
- }
- }
- if (buffer_fill >= buffer_size) {
- buffer[buffer_size - 1] = '\0';
- WARNING ("memcached: Message from memcached has been truncated.");
- } else if (buffer_fill == 0) {
- WARNING ("memcached: Peer has unexpectedly shut down the socket. "
- "Buffer: `%s'", buffer);
- shutdown(fd, SHUT_RDWR);
- close(fd);
- return -1;
- }
- shutdown(fd, SHUT_RDWR);
- close(fd);
- return 0;
- }
- /* }}} */
- static int memcached_config (const char *key, const char *value) /* {{{ */
- {
- if (strcasecmp (key, "Socket") == 0) {
- if (memcached_socket != NULL) {
- free (memcached_socket);
- }
- memcached_socket = strdup (value);
- } else if (strcasecmp (key, "Host") == 0) {
- if (memcached_host != NULL) {
- free (memcached_host);
- }
- memcached_host = strdup (value);
- } else if (strcasecmp (key, "Port") == 0) {
- int port = (int) (atof (value));
- if ((port > 0) && (port <= 65535)) {
- ssnprintf (memcached_port, sizeof (memcached_port), "%i", port);
- } else {
- sstrncpy (memcached_port, value, sizeof (memcached_port));
- }
- } else {
- return -1;
- }
- return 0;
- }
- /* }}} */
- static void submit_counter (const char *type, const char *type_inst,
- counter_t value) /* {{{ */
- {
- value_t values[1];
- value_list_t vl = VALUE_LIST_INIT;
- values[0].counter = value;
- vl.values = values;
- vl.values_len = 1;
- sstrncpy (vl.host, hostname_g, sizeof (vl.host));
- sstrncpy (vl.plugin, "memcached", sizeof (vl.plugin));
- sstrncpy (vl.type, type, sizeof (vl.type));
- if (type_inst != NULL)
- sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
- plugin_dispatch_values (&vl);
- } /* void memcached_submit_cmd */
- /* }}} */
- static void submit_counter2 (const char *type, const char *type_inst,
- counter_t value0, counter_t value1) /* {{{ */
- {
- value_t values[2];
- value_list_t vl = VALUE_LIST_INIT;
- values[0].counter = value0;
- values[1].counter = value1;
- vl.values = values;
- vl.values_len = 2;
- vl.time = time (NULL);
- sstrncpy (vl.host, hostname_g, sizeof (vl.host));
- sstrncpy (vl.plugin, "memcached", sizeof (vl.plugin));
- sstrncpy (vl.type, type, sizeof (vl.type));
- if (type_inst != NULL)
- sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
- plugin_dispatch_values (&vl);
- } /* void memcached_submit_cmd */
- /* }}} */
- static void submit_gauge (const char *type, const char *type_inst,
- 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;
- vl.time = time (NULL);
- sstrncpy (vl.host, hostname_g, sizeof (vl.host));
- sstrncpy (vl.plugin, "memcached", sizeof (vl.plugin));
- sstrncpy (vl.type, type, sizeof (vl.type));
- if (type_inst != NULL)
- sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
- plugin_dispatch_values (&vl);
- }
- /* }}} */
- static void submit_gauge2 (const char *type, const char *type_inst,
- gauge_t value0, gauge_t value1) /* {{{ */
- {
- value_t values[2];
- value_list_t vl = VALUE_LIST_INIT;
- values[0].gauge = value0;
- values[1].gauge = value1;
- vl.values = values;
- vl.values_len = 2;
- vl.time = time (NULL);
- sstrncpy (vl.host, hostname_g, sizeof (vl.host));
- sstrncpy (vl.plugin, "memcached", sizeof (vl.plugin));
- sstrncpy (vl.type, type, sizeof (vl.type));
- if (type_inst != NULL)
- sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
- plugin_dispatch_values (&vl);
- }
- /* }}} */
- static int memcached_read (void) /* {{{ */
- {
- char buf[4096];
- char *fields[3];
- char *ptr;
- char *line;
- char *saveptr;
- int fields_num;
- gauge_t bytes_used = NAN;
- gauge_t bytes_total = NAN;
- gauge_t hits = NAN;
- gauge_t gets = NAN;
- counter_t rusage_user = 0;
- counter_t rusage_syst = 0;
- counter_t octets_rx = 0;
- counter_t octets_tx = 0;
- /* get data from daemon */
- if (memcached_query_daemon (buf, sizeof (buf)) < 0) {
- return -1;
- }
- #define FIELD_IS(cnst) \
- (((sizeof(cnst) - 1) == name_len) && (strcmp (cnst, fields[1]) == 0))
- ptr = buf;
- saveptr = NULL;
- while ((line = strtok_r (ptr, "\n\r", &saveptr)) != NULL)
- {
- int name_len;
- ptr = NULL;
- fields_num = strsplit(line, fields, 3);
- if (fields_num != 3)
- continue;
- name_len = strlen(fields[1]);
- if (name_len == 0)
- continue;
- /*
- * For an explanation on these fields please refer to
- * <http://code.sixapart.com/svn/memcached/trunk/server/doc/protocol.txt>
- */
- /*
- * CPU time consumed by the memcached process
- */
- if (FIELD_IS ("rusage_user"))
- {
- rusage_user = atoll (fields[2]);
- }
- else if (FIELD_IS ("rusage_system"))
- {
- rusage_syst = atoll(fields[2]);
- }
- /*
- * Number of threads of this instance
- */
- else if (FIELD_IS ("threads"))
- {
- submit_gauge2 ("ps_count", NULL, NAN, atof (fields[2]));
- }
- /*
- * Number of items stored
- */
- else if (FIELD_IS ("curr_items"))
- {
- submit_gauge ("memcached_items", "current", atof (fields[2]));
- }
- /*
- * Number of bytes used and available (total - used)
- */
- else if (FIELD_IS ("bytes"))
- {
- bytes_used = atof (fields[2]);
- }
- else if (FIELD_IS ("limit_maxbytes"))
- {
- bytes_total = atof(fields[2]);
- }
- /*
- * Connections
- */
- else if (FIELD_IS ("curr_connections"))
- {
- submit_gauge ("memcached_connections", "current", atof (fields[2]));
- }
- /*
- * Commands
- */
- else if ((name_len > 4) && (strncmp (fields[1], "cmd_", 4) == 0))
- {
- const char *name = fields[1] + 4;
- submit_counter ("memcached_command", name, atoll (fields[2]));
- if (strcmp (name, "get") == 0)
- gets = atof (fields[2]);
- }
- /*
- * Operations on the cache, i. e. cache hits, cache misses and evictions of items
- */
- else if (FIELD_IS ("get_hits"))
- {
- submit_counter ("memcached_ops", "hits", atoll (fields[2]));
- hits = atof (fields[2]);
- }
- else if (FIELD_IS ("get_misses"))
- {
- submit_counter ("memcached_ops", "misses", atoll (fields[2]));
- }
- else if (FIELD_IS ("evictions"))
- {
- submit_counter ("memcached_ops", "evictions", atoll (fields[2]));
- }
- /*
- * Network traffic
- */
- else if (FIELD_IS ("bytes_read"))
- {
- octets_rx = atoll (fields[2]);
- }
- else if (FIELD_IS ("bytes_written"))
- {
- octets_tx = atoll (fields[2]);
- }
- } /* while ((line = strtok_r (ptr, "\n\r", &saveptr)) != NULL) */
- if (!isnan (bytes_used) && !isnan (bytes_total) && (bytes_used <= bytes_total))
- submit_gauge2 ("df", "cache", bytes_used, bytes_total - bytes_used);
- if ((rusage_user != 0) || (rusage_syst != 0))
- submit_counter2 ("ps_cputime", NULL, rusage_user, rusage_syst);
- if ((octets_rx != 0) || (octets_tx != 0))
- submit_counter2 ("memcached_octets", NULL, octets_rx, octets_tx);
- if (!isnan (gets) && !isnan (hits))
- {
- gauge_t rate = NAN;
- if (gets != 0.0)
- rate = 100.0 * hits / gets;
- submit_gauge ("percent", "hitratio", rate);
- }
- return 0;
- }
- /* }}} */
- void module_register (void) /* {{{ */
- {
- plugin_register_config ("memcached", memcached_config, config_keys, config_keys_num);
- plugin_register_read ("memcached", memcached_read);
- }
- /* }}} */
- /*
- * Local variables:
- * tab-width: 4
- * c-basic-offset: 4
- * End:
- * vim600: sw=4 ts=4 fdm=marker noexpandtab
- * vim<600: sw=4 ts=4 noexpandtab
- */