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diff --git a/src/log_logstash.c b/src/log_logstash.c
--- /dev/null
+++ b/src/log_logstash.c
@@ -0,0 +1,384 @@
+/**
+ * collectd - src/log_logstash.c
+ * Copyright (C) 2013 Pierre-Yves Ritschard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Pierre-Yves Ritschard <pyr at spootnik.org>
+ * Acknowledgements:
+ * This file is largely inspired by logfile.c
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+
+#include <sys/types.h>
+#include <pthread.h>
+#include <yajl/yajl_common.h>
+#include <yajl/yajl_gen.h>
+#if HAVE_YAJL_YAJL_VERSION_H
+# include <yajl/yajl_version.h>
+#endif
+#if defined(YAJL_MAJOR) && (YAJL_MAJOR > 1)
+# define HAVE_YAJL_V2 1
+#endif
+
+#define DEFAULT_LOGFILE LOCALSTATEDIR"/log/"PACKAGE_NAME".json.log"
+
+#if COLLECT_DEBUG
+static int log_level = LOG_DEBUG;
+#else
+static int log_level = LOG_INFO;
+#endif /* COLLECT_DEBUG */
+
+static pthread_mutex_t file_lock = PTHREAD_MUTEX_INITIALIZER;
+
+static char *log_file = NULL;
+
+static const char *config_keys[] =
+{
+ "LogLevel",
+ "File"
+};
+static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
+
+static int log_logstash_config (const char *key, const char *value)
+{
+
+ if (0 == strcasecmp (key, "LogLevel")) {
+ log_level = parse_log_severity(value);
+ if (log_level < 0) {
+ log_level = LOG_INFO;
+ ERROR("log_logstash: invalid loglevel [%s] defaulting to 'info'",
+ value);
+ return 1;
+ }
+ }
+ else if (0 == strcasecmp (key, "File")) {
+ sfree (log_file);
+ log_file = strdup (value);
+ }
+ else {
+ return -1;
+ }
+ return 0;
+} /* int log_logstash_config (const char *, const char *) */
+
+static void log_logstash_print (yajl_gen g, int severity,
+ cdtime_t timestamp_time)
+{
+ FILE *fh;
+ _Bool do_close = 0;
+ struct tm timestamp_tm;
+ char timestamp_str[64];
+ const unsigned char *buf;
+ time_t tt;
+#if HAVE_YAJL_V2
+ size_t len;
+#else
+ unsigned int len;
+#endif
+
+ if (yajl_gen_string(g, (u_char *)"level", strlen("level")) !=
+ yajl_gen_status_ok)
+ goto err;
+
+ switch (severity) {
+ case LOG_ERR:
+ if (yajl_gen_string(g, (u_char *)"error", strlen("error")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ case LOG_WARNING:
+ if (yajl_gen_string(g, (u_char *)"warning",
+ strlen("warning")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ case LOG_NOTICE:
+ if (yajl_gen_string(g, (u_char *)"notice", strlen("notice")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ case LOG_INFO:
+ if (yajl_gen_string(g, (u_char *)"info", strlen("info")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ case LOG_DEBUG:
+ if (yajl_gen_string(g, (u_char *)"debug", strlen("debug")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ default:
+ if (yajl_gen_string(g, (u_char *)"unknown",
+ strlen("unknown")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ }
+
+ if (yajl_gen_string(g, (u_char *)"@timestamp", strlen("@timestamp")) !=
+ yajl_gen_status_ok)
+ goto err;
+
+ tt = CDTIME_T_TO_TIME_T (timestamp_time);
+ gmtime_r (&tt, ×tamp_tm);
+
+ /*
+ * format time as a UTC ISO 8601 compliant string
+ */
+ strftime (timestamp_str, sizeof (timestamp_str),
+ "%Y-%m-%d %H:%M:%SZ", ×tamp_tm);
+ timestamp_str[sizeof (timestamp_str) - 1] = '\0';
+
+ if (yajl_gen_string(g, (u_char *)timestamp_str,
+ strlen(timestamp_str)) !=
+ yajl_gen_status_ok)
+ goto err;
+
+ if (yajl_gen_map_close(g) != yajl_gen_status_ok)
+ goto err;
+
+ if (yajl_gen_get_buf(g, &buf, &len) != yajl_gen_status_ok)
+ goto err;
+ pthread_mutex_lock (&file_lock);
+
+ if (log_file == NULL)
+ {
+ fh = fopen (DEFAULT_LOGFILE, "a");
+ do_close = 1;
+ } else if (strcasecmp(log_file, "stdout") == 0) {
+ fh = stdout;
+ do_close = 0;
+ } else if (strcasecmp(log_file, "stderr") == 0) {
+ fh = stderr;
+ do_close = 0;
+ } else {
+ fh = fopen (log_file, "a");
+ do_close = 1;
+ }
+
+ if (fh == NULL)
+ {
+ char errbuf[1024];
+ fprintf (stderr, "log_logstash plugin: fopen (%s) failed: %s\n",
+ (log_file == NULL) ? DEFAULT_LOGFILE : log_file,
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ }
+ else
+ {
+ fprintf(fh, "%s\n", buf);
+ if (do_close) {
+ fclose (fh);
+ } else {
+ fflush(fh);
+ }
+ }
+ pthread_mutex_unlock (&file_lock);
+ yajl_gen_free(g);
+ return;
+
+ err:
+ yajl_gen_free(g);
+ fprintf(stderr, "Could not correctly generate JSON message\n");
+ return;
+} /* void log_logstash_print */
+
+static void log_logstash_log (int severity, const char *msg,
+ user_data_t __attribute__((unused)) *user_data)
+{
+ yajl_gen g;
+#if !defined(HAVE_YAJL_V2)
+ yajl_gen_config conf;
+
+ conf.beautify = 0;
+#endif
+
+ if (severity > log_level)
+ return;
+
+#if HAVE_YAJL_V2
+ g = yajl_gen_alloc(NULL);
+#else
+ g = yajl_gen_alloc(&conf, NULL);
+#endif
+
+ if (g == NULL) {
+ fprintf(stderr, "Could not allocate JSON generator.\n");
+ return;
+ }
+
+ if (yajl_gen_map_open(g) != yajl_gen_status_ok)
+ goto err;
+ if (yajl_gen_string(g, (u_char *)"message", strlen("message")) !=
+ yajl_gen_status_ok)
+ goto err;
+ if (yajl_gen_string(g, (u_char *)msg, strlen(msg)) !=
+ yajl_gen_status_ok)
+ goto err;
+
+ log_logstash_print (g, severity, cdtime ());
+ return;
+ err:
+ yajl_gen_free(g);
+ fprintf(stderr, "Could not generate JSON message preamble\n");
+ return;
+
+} /* void log_logstash_log (int, const char *) */
+
+static int log_logstash_notification (const notification_t *n,
+ user_data_t __attribute__((unused)) *user_data)
+{
+ yajl_gen g;
+#if HAVE_YAJL_V2
+ g = yajl_gen_alloc(NULL);
+#else
+ yajl_gen_config conf;
+
+ conf.beautify = 0;
+ g = yajl_gen_alloc(&conf, NULL);
+#endif
+
+ if (g == NULL) {
+ fprintf(stderr, "Could not allocate JSON generator.\n");
+ return (0);
+ }
+
+ if (yajl_gen_map_open(g) != yajl_gen_status_ok)
+ goto err;
+ if (yajl_gen_string(g, (u_char *)"message", strlen("message")) !=
+ yajl_gen_status_ok)
+ goto err;
+ if (strlen(n->message) > 0) {
+ if (yajl_gen_string(g, (u_char *)n->message,
+ strlen(n->message)) !=
+ yajl_gen_status_ok)
+ goto err;
+ } else {
+ if (yajl_gen_string(g, (u_char *)"notification without a message",
+ strlen("notification without a message")) !=
+ yajl_gen_status_ok)
+ goto err;
+ }
+
+ if (strlen(n->host) > 0) {
+ if (yajl_gen_string(g, (u_char *)"host", strlen("host")) !=
+ yajl_gen_status_ok)
+ goto err;
+ if (yajl_gen_string(g, (u_char *)n->host, strlen(n->host)) !=
+ yajl_gen_status_ok)
+ goto err;
+
+ }
+ if (strlen(n->plugin) > 0) {
+ if (yajl_gen_string(g, (u_char *)"plugin", strlen("plugin")) !=
+ yajl_gen_status_ok)
+ goto err;
+ if (yajl_gen_string(g, (u_char *)n->plugin, strlen(n->plugin)) !=
+ yajl_gen_status_ok)
+ goto err;
+ }
+ if (strlen(n->plugin_instance) > 0) {
+ if (yajl_gen_string(g, (u_char *)"plugin_instance",
+ strlen("plugin_instance")) !=
+ yajl_gen_status_ok)
+ goto err;
+ if (yajl_gen_string(g, (u_char *)n->plugin_instance,
+ strlen(n->plugin_instance)) !=
+ yajl_gen_status_ok)
+ goto err;
+ }
+ if (strlen(n->type) > 0) {
+ if (yajl_gen_string(g, (u_char *)"type", strlen("type")) !=
+ yajl_gen_status_ok)
+ goto err;
+ if (yajl_gen_string(g, (u_char *)n->type, strlen(n->type)) !=
+ yajl_gen_status_ok)
+ goto err;
+ }
+ if (strlen(n->type_instance) > 0) {
+ if (yajl_gen_string(g, (u_char *)"type_instance",
+ strlen("type_instance")) !=
+ yajl_gen_status_ok)
+ goto err;
+ if (yajl_gen_string(g, (u_char *)n->type_instance,
+ strlen(n->type_instance)) !=
+ yajl_gen_status_ok)
+ goto err;
+ }
+
+ if (yajl_gen_string(g, (u_char *)"severity",
+ strlen("severity")) !=
+ yajl_gen_status_ok)
+ goto err;
+
+ switch (n->severity) {
+ case NOTIF_FAILURE:
+ if (yajl_gen_string(g, (u_char *)"failure",
+ strlen("failure")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ case NOTIF_WARNING:
+ if (yajl_gen_string(g, (u_char *)"warning",
+ strlen("warning")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ case NOTIF_OKAY:
+ if (yajl_gen_string(g, (u_char *)"ok",
+ strlen("ok")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ default:
+ if (yajl_gen_string(g, (u_char *)"unknown",
+ strlen("unknown")) !=
+ yajl_gen_status_ok)
+ goto err;
+ break;
+ }
+
+ log_logstash_print (g, LOG_INFO, (n->time != 0) ? n->time : cdtime ());
+ return (0);
+
+ err:
+ yajl_gen_free(g);
+ fprintf(stderr, "Could not correctly generate JSON notification\n");
+ return (0);
+} /* int log_logstash_notification */
+
+void module_register (void)
+{
+ plugin_register_config ("log_logstash",
+ log_logstash_config,
+ config_keys,
+ config_keys_num);
+ plugin_register_log ("log_logstash",
+ log_logstash_log,
+ /* user_data = */ NULL);
+ plugin_register_notification ("log_logstash",
+ log_logstash_notification,
+ /* user_data = */ NULL);
+} /* void module_register (void) */
+
+/* vim: set sw=4 ts=4 tw=78 noexpandtab : */