statsd plugin: Initial implementation.

diff --git a/configure.in b/configure.in
index 27c6cd316b916a0047cfe389face9b5b40d0af9b..3701d8ade781a62e988796d38bf9c81b3f1eeab4 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -5099,6 +5099,7 @@ AC_PLUGIN([rrdtool],     [$with_librrd],       [RRDTool output plugin])
 AC_PLUGIN([sensors],     [$with_libsensors],   [lm_sensors statistics])
 AC_PLUGIN([serial],      [$plugin_serial],     [serial port traffic])
 AC_PLUGIN([snmp],        [$with_libnetsnmp],   [SNMP querying plugin])
+AC_PLUGIN([statsd],      [yes],                [StatsD plugin])
 AC_PLUGIN([swap],        [$plugin_swap],       [Swap usage statistics])
 AC_PLUGIN([syslog],      [$have_syslog],       [Syslog logging plugin])
 AC_PLUGIN([table],       [yes],                [Parsing of tabular data])
@@ -5436,6 +5437,7 @@ Configuration:
     sensors . . . . . . . $enable_sensors
     serial  . . . . . . . $enable_serial
     snmp  . . . . . . . . $enable_snmp
+    statsd  . . . . . . . $enable_statsd
     swap  . . . . . . . . $enable_swap
     syslog  . . . . . . . $enable_syslog
     table . . . . . . . . $enable_table

diff --git a/src/Makefile.am b/src/Makefile.am
index c3e596d4a5fea92d6853521fb9ee19458c5a94d4..b443ae321e59cc89ff5b419301d45f7ab2179961 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1069,6 +1069,15 @@ collectd_LDADD += "-dlopen" snmp.la
 collectd_DEPENDENCIES += snmp.la
 endif
 
+if BUILD_PLUGIN_STATSD
+pkglib_LTLIBRARIES += statsd.la
+statsd_la_SOURCES = statsd.c
+statsd_la_LDFLAGS = -module -avoid-version
+statsd_la_LIBADD = -lpthread
+collectd_LDADD += "-dlopen" statsd.la
+collectd_DEPENDENCIES += statsd.la
+endif
+
 if BUILD_PLUGIN_SWAP
 pkglib_LTLIBRARIES += swap.la
 swap_la_SOURCES = swap.c

diff --git a/src/collectd.conf.in b/src/collectd.conf.in
index 4a88e6646f7dec844ea208231e6867676c4d2e60..7717bc345f917eb9241ec5acda62bebe99cb02e5 100644 (file)
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@ -150,6 +150,7 @@
 #@BUILD_PLUGIN_SENSORS_TRUE@LoadPlugin sensors
 #@BUILD_PLUGIN_SERIAL_TRUE@LoadPlugin serial
 #@BUILD_PLUGIN_SNMP_TRUE@LoadPlugin snmp
+#@BUILD_PLUGIN_STATSD_TRUE@LoadPlugin statsd
 #@BUILD_PLUGIN_SWAP_TRUE@LoadPlugin swap
 #@BUILD_PLUGIN_TABLE_TRUE@LoadPlugin table
 #@BUILD_PLUGIN_TAIL_TRUE@LoadPlugin tail

diff --git a/src/statsd.c b/src/statsd.c
new file mode 100644 (file)
index 0000000..896fb61
--- /dev/null
+++ b/src/statsd.c
@@ -0,0 +1,579 @@
+/**
+ * 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 : */