![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/src/write_graphite.c b/src/write_graphite.c
--- /dev/null
+++ b/src/write_graphite.c
@@ -0,0 +1,615 @@
+/**
+ * collectd - src/write_graphite.c
+ * Copyright (C) 2012 Pierre-Yves Ritschard
+ * Copyright (C) 2011 Scott Sanders
+ * Copyright (C) 2009 Paul Sadauskas
+ * Copyright (C) 2009 Doug MacEachern
+ * Copyright (C) 2007-2013 Florian octo Forster
+ *
+ * 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; only version 2 of the License is applicable.
+ *
+ * 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:
+ * Florian octo Forster <octo at collectd.org>
+ * Doug MacEachern <dougm at hyperic.com>
+ * Paul Sadauskas <psadauskas at gmail.com>
+ * Scott Sanders <scott at jssjr.com>
+ * Pierre-Yves Ritschard <pyr at spootnik.org>
+ *
+ * Based on the write_http plugin.
+ **/
+
+ /* write_graphite plugin configuation example
+ *
+ * <Plugin write_graphite>
+ * <Carbon>
+ * Host "localhost"
+ * Port "2003"
+ * Protocol "udp"
+ * LogSendErrors true
+ * Prefix "collectd"
+ * </Carbon>
+ * </Plugin>
+ */
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+#include "configfile.h"
+
+#include "utils_cache.h"
+#include "utils_complain.h"
+#include "utils_format_graphite.h"
+
+/* Folks without pthread will need to disable this plugin. */
+#include <pthread.h>
+
+#include <sys/socket.h>
+#include <netdb.h>
+
+#ifndef WG_DEFAULT_NODE
+# define WG_DEFAULT_NODE "localhost"
+#endif
+
+#ifndef WG_DEFAULT_SERVICE
+# define WG_DEFAULT_SERVICE "2003"
+#endif
+
+#ifndef WG_DEFAULT_PROTOCOL
+# define WG_DEFAULT_PROTOCOL "tcp"
+#endif
+
+#ifndef WG_DEFAULT_LOG_SEND_ERRORS
+# define WG_DEFAULT_LOG_SEND_ERRORS 1
+#endif
+
+#ifndef WG_DEFAULT_ESCAPE
+# define WG_DEFAULT_ESCAPE '_'
+#endif
+
+/* Ethernet - (IPv6 + TCP) = 1500 - (40 + 32) = 1428 */
+#ifndef WG_SEND_BUF_SIZE
+# define WG_SEND_BUF_SIZE 1428
+#endif
+
+#ifndef WG_MIN_RECONNECT_INTERVAL
+# define WG_MIN_RECONNECT_INTERVAL TIME_T_TO_CDTIME_T (1)
+#endif
+
+/*
+ * Private variables
+ */
+struct wg_callback
+{
+ int sock_fd;
+
+ char *name;
+
+ char *node;
+ char *service;
+ char *protocol;
+ _Bool log_send_errors;
+ char *prefix;
+ char *postfix;
+ char escape_char;
+
+ unsigned int format_flags;
+
+ char send_buf[WG_SEND_BUF_SIZE];
+ size_t send_buf_free;
+ size_t send_buf_fill;
+ cdtime_t send_buf_init_time;
+
+ pthread_mutex_t send_lock;
+ c_complain_t init_complaint;
+ cdtime_t last_connect_time;
+};
+
+
+/*
+ * Functions
+ */
+static void wg_reset_buffer (struct wg_callback *cb)
+{
+ memset (cb->send_buf, 0, sizeof (cb->send_buf));
+ cb->send_buf_free = sizeof (cb->send_buf);
+ cb->send_buf_fill = 0;
+ cb->send_buf_init_time = cdtime ();
+}
+
+static int wg_send_buffer (struct wg_callback *cb)
+{
+ ssize_t status = 0;
+
+ status = swrite (cb->sock_fd, cb->send_buf, strlen (cb->send_buf));
+ if (status < 0)
+ {
+ const char *protocol = cb->protocol ? cb->protocol : WG_DEFAULT_PROTOCOL;
+
+ if (cb->log_send_errors)
+ {
+ char errbuf[1024];
+ ERROR ("write_graphite plugin: send to %s:%s (%s) failed with status %zi (%s)",
+ cb->node, cb->service, protocol,
+ status, sstrerror (errno, errbuf, sizeof (errbuf)));
+ }
+
+ close (cb->sock_fd);
+ cb->sock_fd = -1;
+
+ return (-1);
+ }
+
+ return (0);
+}
+
+/* NOTE: You must hold cb->send_lock when calling this function! */
+static int wg_flush_nolock (cdtime_t timeout, struct wg_callback *cb)
+{
+ int status;
+
+ DEBUG ("write_graphite plugin: wg_flush_nolock: timeout = %.3f; "
+ "send_buf_fill = %zu;",
+ (double)timeout,
+ cb->send_buf_fill);
+
+ /* timeout == 0 => flush unconditionally */
+ if (timeout > 0)
+ {
+ cdtime_t now;
+
+ now = cdtime ();
+ if ((cb->send_buf_init_time + timeout) > now)
+ return (0);
+ }
+
+ if (cb->send_buf_fill <= 0)
+ {
+ cb->send_buf_init_time = cdtime ();
+ return (0);
+ }
+
+ status = wg_send_buffer (cb);
+ wg_reset_buffer (cb);
+
+ return (status);
+}
+
+static int wg_callback_init (struct wg_callback *cb)
+{
+ struct addrinfo ai_hints;
+ struct addrinfo *ai_list;
+ struct addrinfo *ai_ptr;
+ cdtime_t now;
+ int status;
+
+ const char *node = cb->node ? cb->node : WG_DEFAULT_NODE;
+ const char *service = cb->service ? cb->service : WG_DEFAULT_SERVICE;
+ const char *protocol = cb->protocol ? cb->protocol : WG_DEFAULT_PROTOCOL;
+
+ char connerr[1024] = "";
+
+ if (cb->sock_fd > 0)
+ return (0);
+
+ /* Don't try to reconnect too often. By default, one reconnection attempt
+ * is made per second. */
+ now = cdtime ();
+ if ((now - cb->last_connect_time) < WG_MIN_RECONNECT_INTERVAL)
+ return (EAGAIN);
+ cb->last_connect_time = now;
+
+ memset (&ai_hints, 0, sizeof (ai_hints));
+#ifdef AI_ADDRCONFIG
+ ai_hints.ai_flags |= AI_ADDRCONFIG;
+#endif
+ ai_hints.ai_family = AF_UNSPEC;
+
+ if (0 == strcasecmp ("tcp", protocol))
+ ai_hints.ai_socktype = SOCK_STREAM;
+ else
+ ai_hints.ai_socktype = SOCK_DGRAM;
+
+ ai_list = NULL;
+
+ status = getaddrinfo (node, service, &ai_hints, &ai_list);
+ if (status != 0)
+ {
+ ERROR ("write_graphite plugin: getaddrinfo (%s, %s, %s) failed: %s",
+ node, service, protocol, gai_strerror (status));
+ return (-1);
+ }
+
+ assert (ai_list != NULL);
+ for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
+ {
+ cb->sock_fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
+ ai_ptr->ai_protocol);
+ if (cb->sock_fd < 0) {
+ char errbuf[1024];
+ snprintf (connerr, sizeof (connerr), "failed to open socket: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ continue;
+ }
+
+ status = connect (cb->sock_fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
+ if (status != 0)
+ {
+ char errbuf[1024];
+ snprintf (connerr, sizeof (connerr), "failed to connect to remote "
+ "host: %s", sstrerror (errno, errbuf, sizeof (errbuf)));
+ close (cb->sock_fd);
+ cb->sock_fd = -1;
+ continue;
+ }
+
+ break;
+ }
+
+ freeaddrinfo (ai_list);
+
+ if (cb->sock_fd < 0)
+ {
+ if (connerr[0] == '\0')
+ /* this should not happen but try to get a message anyway */
+ sstrerror (errno, connerr, sizeof (connerr));
+ c_complain (LOG_ERR, &cb->init_complaint,
+ "write_graphite plugin: Connecting to %s:%s via %s failed. "
+ "The last error was: %s", node, service, protocol, connerr);
+ return (-1);
+ }
+ else
+ {
+ c_release (LOG_INFO, &cb->init_complaint,
+ "write_graphite plugin: Successfully connected to %s:%s via %s.",
+ node, service, protocol);
+ }
+
+ wg_reset_buffer (cb);
+
+ return (0);
+}
+
+static void wg_callback_free (void *data)
+{
+ struct wg_callback *cb;
+
+ if (data == NULL)
+ return;
+
+ cb = data;
+
+ pthread_mutex_lock (&cb->send_lock);
+
+ wg_flush_nolock (/* timeout = */ 0, cb);
+
+ if (cb->sock_fd >= 0)
+ {
+ close (cb->sock_fd);
+ cb->sock_fd = -1;
+ }
+
+ sfree(cb->name);
+ sfree(cb->node);
+ sfree(cb->protocol);
+ sfree(cb->service);
+ sfree(cb->prefix);
+ sfree(cb->postfix);
+
+ pthread_mutex_destroy (&cb->send_lock);
+
+ sfree(cb);
+}
+
+static int wg_flush (cdtime_t timeout,
+ const char *identifier __attribute__((unused)),
+ user_data_t *user_data)
+{
+ struct wg_callback *cb;
+ int status;
+
+ if (user_data == NULL)
+ return (-EINVAL);
+
+ cb = user_data->data;
+
+ pthread_mutex_lock (&cb->send_lock);
+
+ if (cb->sock_fd < 0)
+ {
+ status = wg_callback_init (cb);
+ if (status != 0)
+ {
+ /* An error message has already been printed. */
+ pthread_mutex_unlock (&cb->send_lock);
+ return (-1);
+ }
+ }
+
+ status = wg_flush_nolock (timeout, cb);
+ pthread_mutex_unlock (&cb->send_lock);
+
+ return (status);
+}
+
+static int wg_send_message (char const *message, struct wg_callback *cb)
+{
+ int status;
+ size_t message_len;
+
+ message_len = strlen (message);
+
+ pthread_mutex_lock (&cb->send_lock);
+
+ if (cb->sock_fd < 0)
+ {
+ status = wg_callback_init (cb);
+ if (status != 0)
+ {
+ /* An error message has already been printed. */
+ pthread_mutex_unlock (&cb->send_lock);
+ return (-1);
+ }
+ }
+
+ if (message_len >= cb->send_buf_free)
+ {
+ status = wg_flush_nolock (/* timeout = */ 0, cb);
+ if (status != 0)
+ {
+ pthread_mutex_unlock (&cb->send_lock);
+ return (status);
+ }
+ }
+
+ /* Assert that we have enough space for this message. */
+ assert (message_len < cb->send_buf_free);
+
+ /* `message_len + 1' because `message_len' does not include the
+ * trailing null byte. Neither does `send_buffer_fill'. */
+ memcpy (cb->send_buf + cb->send_buf_fill,
+ message, message_len + 1);
+ cb->send_buf_fill += message_len;
+ cb->send_buf_free -= message_len;
+
+ DEBUG ("write_graphite plugin: [%s]:%s (%s) buf %zu/%zu (%.1f %%) \"%s\"",
+ cb->node,
+ cb->service,
+ cb->protocol,
+ cb->send_buf_fill, sizeof (cb->send_buf),
+ 100.0 * ((double) cb->send_buf_fill) / ((double) sizeof (cb->send_buf)),
+ message);
+
+ pthread_mutex_unlock (&cb->send_lock);
+
+ return (0);
+}
+
+static int wg_write_messages (const data_set_t *ds, const value_list_t *vl,
+ struct wg_callback *cb)
+{
+ char buffer[WG_SEND_BUF_SIZE];
+ int status;
+
+ if (0 != strcmp (ds->type, vl->type))
+ {
+ ERROR ("write_graphite plugin: DS type does not match "
+ "value list type");
+ return -1;
+ }
+
+ memset (buffer, 0, sizeof (buffer));
+ status = format_graphite (buffer, sizeof (buffer), ds, vl,
+ cb->prefix, cb->postfix, cb->escape_char, cb->format_flags);
+ if (status != 0) /* error message has been printed already. */
+ return (status);
+
+ /* Send the message to graphite */
+ status = wg_send_message (buffer, cb);
+ if (status != 0) /* error message has been printed already. */
+ return (status);
+
+ return (0);
+} /* int wg_write_messages */
+
+static int wg_write (const data_set_t *ds, const value_list_t *vl,
+ user_data_t *user_data)
+{
+ struct wg_callback *cb;
+ int status;
+
+ if (user_data == NULL)
+ return (EINVAL);
+
+ cb = user_data->data;
+
+ status = wg_write_messages (ds, vl, cb);
+
+ return (status);
+}
+
+static int config_set_char (char *dest,
+ oconfig_item_t *ci)
+{
+ char buffer[4];
+ int status;
+
+ memset (buffer, 0, sizeof (buffer));
+
+ status = cf_util_get_string_buffer (ci, buffer, sizeof (buffer));
+ if (status != 0)
+ return (status);
+
+ if (buffer[0] == 0)
+ {
+ ERROR ("write_graphite plugin: Cannot use an empty string for the "
+ "\"EscapeCharacter\" option.");
+ return (-1);
+ }
+
+ if (buffer[1] != 0)
+ {
+ WARNING ("write_graphite plugin: Only the first character of the "
+ "\"EscapeCharacter\" option ('%c') will be used.",
+ (int) buffer[0]);
+ }
+
+ *dest = buffer[0];
+
+ return (0);
+}
+
+static int wg_config_node (oconfig_item_t *ci)
+{
+ struct wg_callback *cb;
+ user_data_t user_data;
+ char callback_name[DATA_MAX_NAME_LEN];
+ int i;
+ int status = 0;
+
+ cb = malloc (sizeof (*cb));
+ if (cb == NULL)
+ {
+ ERROR ("write_graphite plugin: malloc failed.");
+ return (-1);
+ }
+ memset (cb, 0, sizeof (*cb));
+ cb->sock_fd = -1;
+ cb->name = NULL;
+ cb->node = NULL;
+ cb->service = NULL;
+ cb->protocol = NULL;
+ cb->log_send_errors = WG_DEFAULT_LOG_SEND_ERRORS;
+ cb->prefix = NULL;
+ cb->postfix = NULL;
+ cb->escape_char = WG_DEFAULT_ESCAPE;
+ cb->format_flags = GRAPHITE_STORE_RATES;
+
+ /* FIXME: Legacy configuration syntax. */
+ if (strcasecmp ("Carbon", ci->key) != 0)
+ {
+ status = cf_util_get_string (ci, &cb->name);
+ if (status != 0)
+ {
+ wg_callback_free (cb);
+ return (status);
+ }
+ }
+
+ pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
+ C_COMPLAIN_INIT (&cb->init_complaint);
+
+ for (i = 0; i < ci->children_num; i++)
+ {
+ oconfig_item_t *child = ci->children + i;
+
+ if (strcasecmp ("Host", child->key) == 0)
+ cf_util_get_string (child, &cb->node);
+ else if (strcasecmp ("Port", child->key) == 0)
+ cf_util_get_service (child, &cb->service);
+ else if (strcasecmp ("Protocol", child->key) == 0)
+ {
+ cf_util_get_string (child, &cb->protocol);
+
+ if (strcasecmp ("UDP", cb->protocol) != 0 &&
+ strcasecmp ("TCP", cb->protocol) != 0)
+ {
+ ERROR ("write_graphite plugin: Unknown protocol (%s)",
+ cb->protocol);
+ status = -1;
+ }
+ }
+ else if (strcasecmp ("LogSendErrors", child->key) == 0)
+ cf_util_get_boolean (child, &cb->log_send_errors);
+ else if (strcasecmp ("Prefix", child->key) == 0)
+ cf_util_get_string (child, &cb->prefix);
+ else if (strcasecmp ("Postfix", child->key) == 0)
+ cf_util_get_string (child, &cb->postfix);
+ else if (strcasecmp ("StoreRates", child->key) == 0)
+ cf_util_get_flag (child, &cb->format_flags,
+ GRAPHITE_STORE_RATES);
+ else if (strcasecmp ("SeparateInstances", child->key) == 0)
+ cf_util_get_flag (child, &cb->format_flags,
+ GRAPHITE_SEPARATE_INSTANCES);
+ else if (strcasecmp ("AlwaysAppendDS", child->key) == 0)
+ cf_util_get_flag (child, &cb->format_flags,
+ GRAPHITE_ALWAYS_APPEND_DS);
+ else if (strcasecmp ("EscapeCharacter", child->key) == 0)
+ config_set_char (&cb->escape_char, child);
+ else
+ {
+ ERROR ("write_graphite plugin: Invalid configuration "
+ "option: %s.", child->key);
+ status = -1;
+ }
+
+ if (status != 0)
+ break;
+ }
+
+ if (status != 0)
+ {
+ wg_callback_free (cb);
+ return (status);
+ }
+
+ /* FIXME: Legacy configuration syntax. */
+ if (cb->name == NULL)
+ ssnprintf (callback_name, sizeof (callback_name), "write_graphite/%s/%s/%s",
+ cb->node != NULL ? cb->node : WG_DEFAULT_NODE,
+ cb->service != NULL ? cb->service : WG_DEFAULT_SERVICE,
+ cb->protocol != NULL ? cb->protocol : WG_DEFAULT_PROTOCOL);
+ else
+ ssnprintf (callback_name, sizeof (callback_name), "write_graphite/%s",
+ cb->name);
+
+ memset (&user_data, 0, sizeof (user_data));
+ user_data.data = cb;
+ user_data.free_func = wg_callback_free;
+ plugin_register_write (callback_name, wg_write, &user_data);
+
+ user_data.free_func = NULL;
+ plugin_register_flush (callback_name, wg_flush, &user_data);
+
+ return (0);
+}
+
+static int wg_config (oconfig_item_t *ci)
+{
+ int i;
+
+ for (i = 0; i < ci->children_num; i++)
+ {
+ oconfig_item_t *child = ci->children + i;
+
+ if (strcasecmp ("Node", child->key) == 0)
+ wg_config_node (child);
+ /* FIXME: Remove this legacy mode in version 6. */
+ else if (strcasecmp ("Carbon", child->key) == 0)
+ wg_config_node (child);
+ else
+ {
+ ERROR ("write_graphite plugin: Invalid configuration "
+ "option: %s.", child->key);
+ }
+ }
+
+ return (0);
+}
+
+void module_register (void)
+{
+ plugin_register_complex_config ("write_graphite", wg_config);
+}
+
+/* vim: set sw=4 ts=4 sts=4 tw=78 et : */