--- /dev/null
+/**
+ * collectd - src/statsd.c
+ *
+ * Copyright (C) 2013 Florian octo Forster
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Authors:
+ * Florian octo Forster <octo at collectd.org>
+ */
+
+#include "collectd.h"
+#include "plugin.h"
+#include "common.h"
+#include "configfile.h"
+#include "utils_avltree.h"
+#include "utils_complain.h"
+
+#include <pthread.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <poll.h>
+
+#ifndef STATSD_DEFAULT_NODE
+# define STATSD_DEFAULT_NODE NULL
+#endif
+
+#ifndef STATSD_DEFAULT_SERVICE
+# define STATSD_DEFAULT_SERVICE "8125"
+#endif
+
+enum metric_type_e
+{
+ STATSD_COUNTER,
+ STATSD_TIMER,
+ STATSD_GAUGE
+};
+typedef enum metric_type_e metric_type_t;
+
+struct statsd_metric_s
+{
+ metric_type_t type;
+ int64_t value;
+ cdtime_t last_update;
+};
+typedef struct statsd_metric_s statsd_metric_t;
+
+static c_avl_tree_t *metrics_tree = NULL;
+static pthread_mutex_t metrics_lock = PTHREAD_MUTEX_INITIALIZER;
+
+static pthread_t network_thread;
+static _Bool network_thread_running = 0;
+static _Bool network_thread_shutdown = 0;
+
+static char *conf_node = NULL;
+static char *conf_service = NULL;
+
+/* Must hold metrics_lock when calling this function. */
+static int statsd_metric_set_unsafe (char const *name, int64_t value, /* {{{ */
+ metric_type_t type)
+{
+ cdtime_t now;
+ statsd_metric_t *metric;
+ char *key;
+ int status;
+
+ now = cdtime ();
+
+ status = c_avl_get (metrics_tree, name, (void *) &metric);
+ if (status == 0)
+ {
+ metric->value = value;
+ metric->last_update = now;
+
+ return (0);
+ }
+
+ key = strdup (name);
+ metric = calloc (1, sizeof (*metric));
+ if ((key == NULL) || (metric == NULL))
+ {
+ sfree (key);
+ sfree (metric);
+ return (-1);
+ }
+
+ metric->type = type;
+ metric->value = value;
+ metric->last_update = now;
+
+ status = c_avl_insert (metrics_tree, key, metric);
+ if (status != 0)
+ {
+ sfree (key);
+ sfree (metric);
+
+ return (-1);
+ }
+
+ return (0);
+} /* }}} int statsd_metric_set_unsafe */
+
+static int statsd_metric_set (char const *name, int64_t value, /* {{{ */
+ metric_type_t type)
+{
+ int status;
+
+ pthread_mutex_lock (&metrics_lock);
+ status = statsd_metric_set_unsafe (name, value, type);
+ pthread_mutex_unlock (&metrics_lock);
+
+ return (status);
+} /* }}} int statsd_metric_set */
+
+static int statsd_metric_add (char const *name, int64_t delta, /* {{{ */
+ metric_type_t type)
+{
+ cdtime_t now;
+ statsd_metric_t *metric;
+ int status;
+
+ now = cdtime ();
+ pthread_mutex_lock (&metrics_lock);
+
+ status = c_avl_get (metrics_tree, name, (void *) &metric);
+ if (status == 0)
+ {
+ metric->value += delta;
+ metric->last_update = now;
+
+ pthread_mutex_unlock (&metrics_lock);
+ return (0);
+ }
+ else /* no such value yet */
+ {
+ status = statsd_metric_set_unsafe (name, delta, type);
+
+ pthread_mutex_unlock (&metrics_lock);
+ return (status);
+ }
+} /* }}} int statsd_metric_add */
+
+static int statsd_handle_counter (char const *name, /* {{{ */
+ char const *value_str,
+ char const *extra)
+{
+ value_t value;
+ value_t scale;
+ int status;
+
+ if ((extra != NULL) && (extra[0] != '@'))
+ return (-1);
+
+ scale.gauge = 1.0;
+ if (extra != NULL)
+ {
+ status = parse_value (extra + 1, &scale, DS_TYPE_GAUGE);
+ if (status != 0)
+ return (status);
+
+ if (!isfinite (scale.gauge) || (scale.gauge <= 0.0) || (scale.gauge > 1.0))
+ return (-1);
+ }
+
+ value.derive = 1;
+ status = parse_value (value_str, &value, DS_TYPE_DERIVE);
+ if (status != 0)
+ return (status);
+
+ if (value.derive < 1)
+ return (-1);
+
+ return (statsd_metric_add (name,
+ (int64_t) (((gauge_t) value.derive) / scale.gauge),
+ STATSD_COUNTER));
+} /* }}} int statsd_handle_counter */
+
+static int statsd_handle_gauge (char const *name, /* {{{ */
+ char const *value_str)
+{
+ value_t value;
+ int status;
+
+ value.derive = 0;
+ status = parse_value (value_str, &value, DS_TYPE_DERIVE);
+ if (status != 0)
+ return (status);
+
+ if ((value_str[0] == '+') || (value_str[0] == '-'))
+ return (statsd_metric_add (name, (int64_t) value.derive, STATSD_GAUGE));
+ else
+ return (statsd_metric_set (name, (int64_t) value.derive, STATSD_GAUGE));
+} /* }}} int statsd_handle_gauge */
+
+static int statsd_handle_timer (char const *name, /* {{{ */
+ char const *value_str)
+{
+ value_t value;
+ int status;
+
+ value.derive = 0;
+ status = parse_value (value_str, &value, DS_TYPE_DERIVE);
+ if (status != 0)
+ return (status);
+
+ return (statsd_metric_add (name, (int64_t) value.derive, STATSD_TIMER));
+} /* }}} int statsd_handle_timer */
+
+static int statsd_handle_set (char const *name __attribute__((unused)), /* {{{ */
+ char const *value_str __attribute__((unused)))
+{
+ static c_complain_t c = C_COMPLAIN_INIT_STATIC;
+
+ c_complain (LOG_WARNING, &c,
+ "statsd plugin: Support for sets is not yet implemented.");
+
+ return (0);
+} /* }}} int statsd_handle_set */
+
+static int statsd_parse_line (char *buffer) /* {{{ */
+{
+ char *name = buffer;
+ char *value;
+ char *type;
+ char *extra;
+
+ type = strchr (name, '|');
+ if (type == NULL)
+ return (-1);
+ *type = 0;
+ type++;
+
+ value = strrchr (name, ':');
+ if (value == NULL)
+ return (-1);
+ *value = 0;
+ value++;
+
+ extra = strchr (type, '|');
+ if (extra != NULL)
+ {
+ *extra = 0;
+ extra++;
+ }
+
+ if (strcmp ("c", type) == 0)
+ return (statsd_handle_counter (name, value, extra));
+
+ /* extra is only valid for counters */
+ if (extra != NULL)
+ return (-1);
+
+ if (strcmp ("g", type) == 0)
+ return (statsd_handle_gauge (name, value));
+ else if (strcmp ("ms", type) == 0)
+ return (statsd_handle_timer (name, value));
+ else if (strcmp ("s", type) == 0)
+ return (statsd_handle_set (name, value));
+ else
+ return (-1);
+} /* }}} void statsd_parse_line */
+
+static void statsd_parse_buffer (char *buffer) /* {{{ */
+{
+ char *dummy;
+ char *saveptr = NULL;
+ char *ptr;
+
+ for (dummy = buffer;
+ (ptr = strtok_r (dummy, "\r\n", &saveptr)) != NULL;
+ dummy = NULL)
+ {
+ char *line_orig = sstrdup (ptr);
+ int status;
+
+ status = statsd_parse_line (ptr);
+ if (status != 0)
+ ERROR ("statsd plugin: Unable to parse line: \"%s\"", line_orig);
+
+ sfree (line_orig);
+ }
+} /* }}} void statsd_parse_buffer */
+
+static void statsd_network_read (int fd) /* {{{ */
+{
+ char buffer[4096];
+ size_t buffer_size;
+ ssize_t status;
+
+ status = recv (fd, buffer, sizeof (buffer), /* flags = */ MSG_DONTWAIT);
+ if (status < 0)
+ {
+ char errbuf[1024];
+
+ if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
+ return;
+
+ ERROR ("statsd plugin: recv(2) failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ return;
+ }
+
+ buffer_size = (size_t) status;
+ if (buffer_size >= sizeof (buffer))
+ buffer_size = sizeof (buffer) - 1;
+ buffer[buffer_size] = 0;
+
+ statsd_parse_buffer (buffer);
+} /* }}} void statsd_network_read */
+
+static int statsd_network_init (struct pollfd **ret_fds, /* {{{ */
+ size_t *ret_fds_num)
+{
+ struct pollfd *fds = NULL;
+ size_t fds_num = 0;
+
+ struct addrinfo ai_hints;
+ struct addrinfo *ai_list = NULL;
+ struct addrinfo *ai_ptr;
+ int status;
+
+ char const *node = (conf_node != NULL) ? conf_node : STATSD_DEFAULT_NODE;
+ char const *service = (conf_service != NULL)
+ ? conf_service : STATSD_DEFAULT_SERVICE;
+
+ memset (&ai_hints, 0, sizeof (ai_hints));
+ ai_hints.ai_flags = AI_PASSIVE;
+#ifdef AI_ADDRCONFIG
+ ai_hints.ai_flags |= AI_ADDRCONFIG;
+#endif
+ ai_hints.ai_family = AF_UNSPEC;
+ ai_hints.ai_socktype = SOCK_DGRAM;
+
+ status = getaddrinfo (node, service, &ai_hints, &ai_list);
+ if (status != 0)
+ {
+ ERROR ("statsd plugin: getaddrinfo (\"%s\", \"%s\") failed: %s",
+ node, service, gai_strerror (status));
+ return (status);
+ }
+
+ for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
+ {
+ int fd;
+ struct pollfd *tmp;
+
+ char dbg_node[NI_MAXHOST];
+ char dbg_service[NI_MAXSERV];
+
+ fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
+ if (fd < 0)
+ {
+ char errbuf[1024];
+ ERROR ("statsd plugin: socket(2) failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ continue;
+ }
+
+ getnameinfo (ai_ptr->ai_addr, ai_ptr->ai_addrlen,
+ dbg_node, sizeof (dbg_node), dbg_service, sizeof (dbg_service),
+ NI_DGRAM | NI_NUMERICHOST | NI_NUMERICSERV);
+ DEBUG ("statsd plugin: Trying to bind to [%s]:%s ...", dbg_node, dbg_service);
+
+ status = bind (fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ ERROR ("statsd plugin: bind(2) failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ close (fd);
+ continue;
+ }
+
+ tmp = realloc (fds, sizeof (*fds) * (fds_num + 1));
+ if (tmp == NULL)
+ {
+ ERROR ("statsd plugin: realloc failed.");
+ continue;
+ }
+ fds = tmp;
+ tmp = fds + fds_num;
+ fds_num++;
+
+ memset (tmp, 0, sizeof (*tmp));
+ tmp->fd = fd;
+ tmp->events = POLLIN | POLLPRI;
+ }
+
+ freeaddrinfo (ai_list);
+
+ if (fds_num == 0)
+ {
+ ERROR ("statsd plugin: Unable to create listening socket for [%s]:%s.",
+ (node != NULL) ? node : "::", service);
+ return (ENOENT);
+ }
+
+ *ret_fds = fds;
+ *ret_fds_num = fds_num;
+ return (0);
+} /* }}} int statsd_network_init */
+
+static void *statsd_network_thread (void *args) /* {{{ */
+{
+ struct pollfd *fds = NULL;
+ size_t fds_num = 0;
+ int status;
+ size_t i;
+
+ status = statsd_network_init (&fds, &fds_num);
+ if (status != 0)
+ {
+ ERROR ("statsd plugin: Unable to open listening sockets.");
+ pthread_exit ((void *) 0);
+ }
+
+ while (!network_thread_shutdown)
+ {
+ status = poll (fds, (nfds_t) fds_num, /* timeout = */ -1);
+ if (status < 0)
+ {
+ char errbuf[1024];
+
+ if ((errno == EINTR) || (errno == EAGAIN))
+ continue;
+
+ ERROR ("statsd plugin: poll(2) failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ break;
+ }
+
+ for (i = 0; i < fds_num; i++)
+ {
+ if ((fds[i].revents & (POLLIN | POLLPRI)) == 0)
+ continue;
+
+ statsd_network_read (fds[i].fd);
+ fds[i].revents = 0;
+ }
+ } /* while (!network_thread_shutdown) */
+
+ /* Clean up */
+ for (i = 0; i < fds_num; i++)
+ close (fds[i].fd);
+ sfree (fds);
+
+ return ((void *) 0);
+} /* }}} void *statsd_network_thread */
+
+static int statsd_init (void) /* {{{ */
+{
+ pthread_mutex_lock (&metrics_lock);
+ if (metrics_tree == NULL)
+ metrics_tree = c_avl_create ((void *) strcasecmp);
+
+ if (!network_thread_running)
+ {
+ int status;
+
+ status = pthread_create (&network_thread,
+ /* attr = */ NULL,
+ statsd_network_thread,
+ /* args = */ NULL);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ pthread_mutex_unlock (&metrics_lock);
+ ERROR ("statsd plugin: pthread_create failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ return (status);
+ }
+ }
+ network_thread_running = 1;
+
+ pthread_mutex_unlock (&metrics_lock);
+
+ return (0);
+} /* }}} int statsd_init */
+
+static int statsd_metric_submit (char const *name, /* {{{ */
+ statsd_metric_t const *metric)
+{
+ value_t values[1];
+ value_list_t vl = VALUE_LIST_INIT;
+
+ if (metric->type == STATSD_GAUGE)
+ values[0].gauge = (gauge_t) metric->value;
+ else
+ values[0].derive = (derive_t) metric->value;
+
+ vl.values = values;
+ vl.values_len = 1;
+ sstrncpy (vl.host, hostname_g, sizeof (vl.host));
+ sstrncpy (vl.plugin, "statsd", sizeof (vl.plugin));
+
+ if (metric->type == STATSD_GAUGE)
+ sstrncpy (vl.type, "gauge", sizeof (vl.type));
+ else if (metric->type == STATSD_TIMER)
+ sstrncpy (vl.type, "total_time_in_ms", sizeof (vl.type));
+ else /* if (metric->type == STATSD_COUNTER) */
+ sstrncpy (vl.type, "derive", sizeof (vl.type));
+
+ sstrncpy (vl.type_instance, name, sizeof (vl.type_instance));
+
+ return (plugin_dispatch_values (&vl));
+} /* }}} int statsd_metric_submit */
+
+static int statsd_read (void) /* {{{ */
+{
+ c_avl_iterator_t *i;
+ char *name;
+ statsd_metric_t *metric;
+
+ pthread_mutex_lock (&metrics_lock);
+
+ if (metrics_tree == NULL)
+ {
+ pthread_mutex_unlock (&metrics_lock);
+ return (0);
+ }
+
+ i = c_avl_get_iterator (metrics_tree);
+ while (c_avl_iterator_next (i, (void *) &name, (void *) &metric) == 0)
+ statsd_metric_submit (name, metric);
+ c_avl_iterator_destroy (i);
+
+ pthread_mutex_unlock (&metrics_lock);
+
+ return (0);
+} /* }}} int statsd_read */
+
+static int statsd_shutdown (void) /* {{{ */
+{
+ void *key;
+ void *value;
+
+ pthread_mutex_lock (&metrics_lock);
+
+ if (network_thread_running)
+ {
+ network_thread_shutdown = 1;
+ pthread_kill (network_thread, SIGTERM);
+ pthread_join (network_thread, /* retval = */ NULL);
+ }
+ network_thread_running = 0;
+
+ while (c_avl_pick (metrics_tree, &key, &value) == 0)
+ {
+ sfree (key);
+ sfree (value);
+ }
+ c_avl_destroy (metrics_tree);
+ metrics_tree = NULL;
+
+ pthread_mutex_unlock (&metrics_lock);
+
+ return (0);
+} /* }}} int statsd_shutdown */
+
+void module_register (void)
+{
+ plugin_register_init ("statsd", statsd_init);
+ plugin_register_read ("statsd", statsd_read);
+ plugin_register_shutdown ("statsd", statsd_shutdown);
+}
+
+/* vim: set sw=2 sts=2 et fdm=marker : */
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