X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fplugin.c;h=1aad97c1d7f073931de749bb9676874de3d2b59c;hb=bc7992ed0693313a2b1fe282a5bf23f1cc9f8e42;hp=23ea9017cce27aa71370c32b41d7496b0944c837;hpb=7e4b7b46592718cafa5f21ce03bd10dcf919a26d;p=collectd.git

diff --git a/src/plugin.c b/src/plugin.c
index 23ea9017..cd7b1083 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -1,6 +1,6 @@
 /**
  * collectd - src/plugin.c
- * Copyright (C) 2005,2006  Florian octo Forster
+ * Copyright (C) 2005-2009  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
@@ -17,9 +17,11 @@
  *
  * Authors:
  *   Florian octo Forster <octo at verplant.org>
+ *   Sebastian Harl <sh at tokkee.org>
  **/
 
 #include "collectd.h"
+#include "utils_complain.h"
 
 #include <ltdl.h>
 
@@ -30,7 +32,11 @@
 #include "common.h"
 #include "plugin.h"
 #include "configfile.h"
+#include "utils_avltree.h"
 #include "utils_llist.h"
+#include "utils_cache.h"
+#include "utils_threshold.h"
+#include "filter_chain.h"
 
 /*
  * Private structures
@@ -50,9 +56,16 @@ typedef struct read_func_s read_func_t;
 static llist_t *list_init;
 static llist_t *list_read;
 static llist_t *list_write;
+static llist_t *list_filter;
+static llist_t *list_flush;
 static llist_t *list_shutdown;
-static llist_t *list_data_set;
 static llist_t *list_log;
+static llist_t *list_notification;
+
+static fc_chain_t *pre_cache_chain = NULL;
+static fc_chain_t *post_cache_chain = NULL;
+
+static c_avl_tree_t *data_sets;
 
 static char *plugindir = NULL;
 
@@ -76,6 +89,7 @@ static const char *plugin_get_dir (void)
 static int register_callback (llist_t **list, const char *name, void *callback)
 {
 	llentry_t *le;
+	char *key;
 
 	if ((*list == NULL)
 			&& ((*list = llist_create ()) == NULL))
@@ -84,9 +98,16 @@ static int register_callback (llist_t **list, const char *name, void *callback)
 	le = llist_search (*list, name);
 	if (le == NULL)
 	{
-		le = llentry_create (name, callback);
+		key = strdup (name);
+		if (key == NULL)
+			return (-1);
+
+		le = llentry_create (key, callback);
 		if (le == NULL)
+		{
+			free (key);
 			return (-1);
+		}
 
 		llist_append (*list, le);
 	}
@@ -108,6 +129,7 @@ static int plugin_unregister (llist_t *list, const char *name)
 		return (-1);
 
 	llist_remove (list, e);
+	free (e->key);
 	llentry_destroy (e);
 
 	return (0);
@@ -132,14 +154,14 @@ static int plugin_load_file (char *file)
 	{
 		const char *error = lt_dlerror ();
 
-		ERROR ("lt_dlopen failed: %s", error);
-		fprintf (stderr, "lt_dlopen failed: %s\n", error);
+		ERROR ("lt_dlopen (%s) failed: %s", file, error);
+		fprintf (stderr, "lt_dlopen (%s) failed: %s\n", file, error);
 		return (1);
 	}
 
 	if ((reg_handle = (void (*) (void)) lt_dlsym (dlh, "module_register")) == NULL)
 	{
-		WARNING ("Couldn't find symbol ``module_register'' in ``%s'': %s\n",
+		WARNING ("Couldn't find symbol `module_register' in `%s': %s\n",
 				file, lt_dlerror ());
 		lt_dlclose (dlh);
 		return (-1);
@@ -220,6 +242,7 @@ static void *plugin_read_thread (void *args)
 	pthread_mutex_unlock (&read_lock);
 
 	pthread_exit (NULL);
+	return ((void *) 0);
 } /* void *plugin_read_thread */
 
 static void start_threads (int num)
@@ -256,6 +279,9 @@ static void stop_threads (void)
 {
 	int i;
 
+	if (read_threads == NULL)
+		return;
+
 	pthread_mutex_lock (&read_lock);
 	read_loop = 0;
 	DEBUG ("plugin: stop_threads: Signalling `read_cond'");
@@ -297,7 +323,7 @@ int plugin_load (const char *type)
 {
 	DIR  *dh;
 	const char *dir;
-	char  filename[BUFSIZE];
+	char  filename[BUFSIZE] = "";
 	char  typename[BUFSIZE];
 	int   typename_len;
 	int   ret;
@@ -311,7 +337,8 @@ int plugin_load (const char *type)
 
 	/* `cpu' should not match `cpufreq'. To solve this we add `.so' to the
 	 * type when matching the filename */
-	if (snprintf (typename, BUFSIZE, "%s.so", type) >= BUFSIZE)
+	if (ssnprintf (typename, sizeof (typename),
+			"%s.so", type) >= sizeof (typename))
 	{
 		WARNING ("snprintf: truncated: `%s.so'", type);
 		return (-1);
@@ -331,7 +358,8 @@ int plugin_load (const char *type)
 		if (strncasecmp (de->d_name, typename, typename_len))
 			continue;
 
-		if (snprintf (filename, BUFSIZE, "%s/%s", dir, de->d_name) >= BUFSIZE)
+		if (ssnprintf (filename, sizeof (filename),
+				"%s/%s", dir, de->d_name) >= sizeof (filename))
 		{
 			WARNING ("snprintf: truncated: `%s/%s'", dir, de->d_name);
 			continue;
@@ -364,6 +392,9 @@ int plugin_load (const char *type)
 
 	closedir (dh);
 
+	if (filename[0] == '\0')
+		fprintf (stderr, "Could not find plugin %s.\n", type);
+
 	return (ret);
 }
 
@@ -419,6 +450,18 @@ int plugin_register_write (const char *name,
 	return (register_callback (&list_write, name, (void *) callback));
 } /* int plugin_register_write */
 
+int plugin_register_filter (const char *name,
+		int (*callback) (const data_set_t *ds, value_list_t *vl))
+{
+	return (register_callback (&list_filter, name, (void *) callback));
+} /* int plugin_register_filter */
+
+int plugin_register_flush (const char *name,
+		int (*callback) (const int timeout, const char *identifier))
+{
+	return (register_callback (&list_flush, name, (void *) callback));
+} /* int plugin_register_flush */
+
 int plugin_register_shutdown (char *name,
 		int (*callback) (void))
 {
@@ -430,12 +473,18 @@ int plugin_register_data_set (const data_set_t *ds)
 	data_set_t *ds_copy;
 	int i;
 
-	if ((list_data_set != NULL)
-			&& (llist_search (list_data_set, ds->type) != NULL))
+	if ((data_sets != NULL)
+			&& (c_avl_get (data_sets, ds->type, NULL) == 0))
 	{
 		NOTICE ("Replacing DS `%s' with another version.", ds->type);
 		plugin_unregister_data_set (ds->type);
 	}
+	else if (data_sets == NULL)
+	{
+		data_sets = c_avl_create ((int (*) (const void *, const void *)) strcmp);
+		if (data_sets == NULL)
+			return (-1);
+	}
 
 	ds_copy = (data_set_t *) malloc (sizeof (data_set_t));
 	if (ds_copy == NULL)
@@ -453,7 +502,7 @@ int plugin_register_data_set (const data_set_t *ds)
 	for (i = 0; i < ds->ds_num; i++)
 		memcpy (ds_copy->ds + i, ds->ds + i, sizeof (data_source_t));
 
-	return (register_callback (&list_data_set, ds->type, (void *) ds_copy));
+	return (c_avl_insert (data_sets, (void *) ds_copy->type, (void *) ds_copy));
 } /* int plugin_register_data_set */
 
 int plugin_register_log (char *name,
@@ -462,6 +511,12 @@ int plugin_register_log (char *name,
 	return (register_callback (&list_log, name, (void *) callback));
 } /* int plugin_register_log */
 
+int plugin_register_notification (const char *name,
+		int (*callback) (const notification_t *notif))
+{
+	return (register_callback (&list_notification, name, (void *) callback));
+} /* int plugin_register_log */
+
 int plugin_unregister_config (const char *name)
 {
 	cf_unregister (name);
@@ -490,6 +545,7 @@ int plugin_unregister_read (const char *name)
 
 	llist_remove (list_read, e);
 	free (e->value);
+	free (e->key);
 	llentry_destroy (e);
 
 	return (0);
@@ -500,6 +556,16 @@ int plugin_unregister_write (const char *name)
 	return (plugin_unregister (list_write, name));
 }
 
+int plugin_unregister_filter (const char *name)
+{
+	return (plugin_unregister (list_filter, name));
+}
+
+int plugin_unregister_flush (const char *name)
+{
+	return (plugin_unregister (list_flush, name));
+}
+
 int plugin_unregister_shutdown (const char *name)
 {
 	return (plugin_unregister (list_shutdown, name));
@@ -507,21 +573,14 @@ int plugin_unregister_shutdown (const char *name)
 
 int plugin_unregister_data_set (const char *name)
 {
-	llentry_t  *e;
 	data_set_t *ds;
 
-	if (list_data_set == NULL)
+	if (data_sets == NULL)
 		return (-1);
 
-	e = llist_search (list_data_set, name);
-
-	if (e == NULL)
+	if (c_avl_remove (data_sets, name, NULL, (void *) &ds) != 0)
 		return (-1);
 
-	llist_remove (list_data_set, e);
-	ds = (data_set_t *) e->value;
-	llentry_destroy (e);
-
 	sfree (ds->ds);
 	sfree (ds);
 
@@ -533,25 +592,34 @@ int plugin_unregister_log (const char *name)
 	return (plugin_unregister (list_log, name));
 }
 
+int plugin_unregister_notification (const char *name)
+{
+	return (plugin_unregister (list_notification, name));
+}
+
 void plugin_init_all (void)
 {
+	const char *chain_name;
 	int (*callback) (void);
 	llentry_t *le;
 	int status;
 
-	/* Start read-threads */
-	if (list_read != NULL)
-	{
-		const char *rt;
-		int num;
-		rt = global_option_get ("ReadThreads");
-		num = atoi (rt);
-		start_threads ((num > 0) ? num : 5);
-	}
+	/* Init the value cache */
+	uc_init ();
+
+	chain_name = global_option_get ("PreCacheChain");
+	pre_cache_chain = fc_chain_get_by_name (chain_name);
+
+	chain_name = global_option_get ("PostCacheChain");
+	post_cache_chain = fc_chain_get_by_name (chain_name);
 
-	if (list_init == NULL)
+
+	if ((list_init == NULL) && (list_read == NULL))
 		return;
 
+	/* Calling all init callbacks before checking if read callbacks
+	 * are available allows the init callbacks to register the read
+	 * callback. */
 	le = llist_head (list_init);
 	while (le != NULL)
 	{
@@ -564,19 +632,35 @@ void plugin_init_all (void)
 					"failed with status %i. "
 					"Plugin will be unloaded.",
 					le->key, status);
+			/* Plugins that register read callbacks from the init
+			 * callback should take care of appropriate error
+			 * handling themselves. */
 			/* FIXME: Unload _all_ functions */
 			plugin_unregister_read (le->key);
 		}
 
 		le = le->next;
 	}
+
+	/* Start read-threads */
+	if (list_read != NULL)
+	{
+		const char *rt;
+		int num;
+		rt = global_option_get ("ReadThreads");
+		num = atoi (rt);
+		if (num != -1)
+			start_threads ((num > 0) ? num : 5);
+	}
 } /* void plugin_init_all */
 
-void plugin_read_all (const int *loop)
+void plugin_read_all (void)
 {
 	llentry_t   *le;
 	read_func_t *rf;
 
+	uc_check_timeout ();
+
 	if (list_read == NULL)
 		return;
 
@@ -609,6 +693,130 @@ void plugin_read_all (const int *loop)
 	pthread_mutex_unlock (&read_lock);
 } /* void plugin_read_all */
 
+/* Read function called when the `-T' command line argument is given. */
+int plugin_read_all_once (void)
+{
+	llentry_t   *le;
+	read_func_t *rf;
+	int status;
+	int return_status = 0;
+
+	if (list_read == NULL)
+	{
+		NOTICE ("No read-functions are registered.");
+		return (0);
+	}
+
+	for (le = llist_head (list_read);
+	     le != NULL;
+	     le = le->next)
+	{
+		rf = (read_func_t *) le->value;
+		status = rf->callback ();
+		if (status != 0)
+		{
+			NOTICE ("read-function of plugin `%s' failed.",
+				le->key);
+			return_status = -1;
+		}
+	}
+
+	return (return_status);
+} /* int plugin_read_all_once */
+
+int plugin_write (const char *plugin, /* {{{ */
+		const data_set_t *ds, const value_list_t *vl)
+{
+  int (*callback) (const data_set_t *ds, const value_list_t *vl);
+  llentry_t *le;
+  int status;
+
+  if (vl == NULL)
+    return (EINVAL);
+
+  if (list_write == NULL)
+    return (ENOENT);
+
+  if (ds == NULL)
+  {
+    ds = plugin_get_ds (vl->type);
+    if (ds == NULL)
+    {
+      ERROR ("plugin_write: Unable to lookup type `%s'.", vl->type);
+      return (ENOENT);
+    }
+  }
+
+  if (plugin == NULL)
+  {
+    int success = 0;
+    int failure = 0;
+
+    le = llist_head (list_write);
+    while (le != NULL)
+    {
+      callback = le->value;
+      status = (*callback) (ds, vl);
+      if (status != 0)
+        failure++;
+      else
+        success++;
+
+      le = le->next;
+    }
+
+    if ((success == 0) && (failure != 0))
+      status = -1;
+    else
+      status = 0;
+  }
+  else /* plugin != NULL */
+  {
+    le = llist_head (list_write);
+    while (le != NULL)
+    {
+      if (strcasecmp (plugin, le->key) == 0)
+        break;
+
+      le = le->next;
+    }
+
+    if (le == NULL)
+      return (ENOENT);
+
+    callback = le->value;
+    status = (*callback) (ds, vl);
+  }
+
+  return (status);
+} /* }}} int plugin_write */
+
+int plugin_flush (const char *plugin, int timeout, const char *identifier)
+{
+  int (*callback) (int timeout, const char *identifier);
+  llentry_t *le;
+
+  if (list_flush == NULL)
+    return (0);
+
+  le = llist_head (list_flush);
+  while (le != NULL)
+  {
+    if ((plugin != NULL)
+        && (strcmp (plugin, le->key) != 0))
+    {
+      le = le->next;
+      continue;
+    }
+
+    callback = (int (*) (int, const char *)) le->value;
+    (*callback) (timeout, identifier);
+
+    le = le->next;
+  }
+  return (0);
+} /* int plugin_flush */
+
 void plugin_shutdown_all (void)
 {
 	int (*callback) (void);
@@ -634,39 +842,65 @@ void plugin_shutdown_all (void)
 	}
 } /* void plugin_shutdown_all */
 
-int plugin_dispatch_values (const char *name, value_list_t *vl)
+int plugin_dispatch_values (value_list_t *vl)
 {
-	int (*callback) (const data_set_t *, const value_list_t *);
+	int status;
+	static c_complain_t no_write_complaint = C_COMPLAIN_INIT_STATIC;
+
 	data_set_t *ds;
-	llentry_t *le;
 
-	if ((list_write == NULL) || (list_data_set == NULL))
+	if ((vl == NULL) || (*vl->type == '\0')) {
+		ERROR ("plugin_dispatch_values: Invalid value list.");
 		return (-1);
+	}
 
-	le = llist_search (list_data_set, name);
-	if (le == NULL)
+	if (list_write == NULL)
+		c_complain_once (LOG_WARNING, &no_write_complaint,
+				"plugin_dispatch_values: No write callback has been "
+				"registered. Please load at least one output plugin, "
+				"if you want the collected data to be stored.");
+
+	if (data_sets == NULL)
 	{
-		DEBUG ("No such dataset registered: %s", name);
+		ERROR ("plugin_dispatch_values: No data sets registered. "
+				"Could the types database be read? Check "
+				"your `TypesDB' setting!");
 		return (-1);
 	}
 
-	ds = (data_set_t *) le->value;
+	if (c_avl_get (data_sets, vl->type, (void *) &ds) != 0)
+	{
+		INFO ("plugin_dispatch_values: Dataset not found: %s", vl->type);
+		return (-1);
+	}
 
-	DEBUG ("plugin: plugin_dispatch_values: time = %u; interval = %i; "
+	if (vl->time == 0)
+		vl->time = time (NULL);
+
+	DEBUG ("plugin_dispatch_values: time = %u; interval = %i; "
 			"host = %s; "
 			"plugin = %s; plugin_instance = %s; "
 			"type = %s; type_instance = %s;",
 			(unsigned int) vl->time, vl->interval,
 			vl->host,
 			vl->plugin, vl->plugin_instance,
-			ds->type, vl->type_instance);
+			vl->type, vl->type_instance);
+
+#if COLLECT_DEBUG
+	assert (0 == strcmp (ds->type, vl->type));
+#else
+	if (0 != strcmp (ds->type, vl->type))
+		WARNING ("plugin_dispatch_values: (ds->type = %s) != (vl->type = %s)",
+				ds->type, vl->type);
+#endif
 
 #if COLLECT_DEBUG
 	assert (ds->ds_num == vl->values_len);
 #else
 	if (ds->ds_num != vl->values_len)
 	{
-		ERROR ("plugin: ds->type = %s: (ds->ds_num = %i) != "
+		ERROR ("plugin_dispatch_values: ds->type = %s: "
+				"(ds->ds_num = %i) != "
 				"(vl->values_len = %i)",
 				ds->type, ds->ds_num, vl->values_len);
 		return (-1);
@@ -676,23 +910,73 @@ int plugin_dispatch_values (const char *name, value_list_t *vl)
 	escape_slashes (vl->host, sizeof (vl->host));
 	escape_slashes (vl->plugin, sizeof (vl->plugin));
 	escape_slashes (vl->plugin_instance, sizeof (vl->plugin_instance));
+	escape_slashes (vl->type, sizeof (vl->type));
 	escape_slashes (vl->type_instance, sizeof (vl->type_instance));
 
-	le = llist_head (list_write);
+	if (pre_cache_chain != NULL)
+	{
+		status = fc_process_chain (ds, vl, pre_cache_chain);
+		if (status < 0)
+		{
+			WARNING ("plugin_dispatch_values: Running the "
+					"pre-cache chain failed with "
+					"status %i (%#x).",
+					status, status);
+		}
+		else if (status == FC_TARGET_STOP)
+			return (0);
+	}
+
+	/* Update the value cache */
+	uc_update (ds, vl);
+
+	if (post_cache_chain != NULL)
+	{
+		status = fc_process_chain (ds, vl, post_cache_chain);
+		if (status < 0)
+		{
+			WARNING ("plugin_dispatch_values: Running the "
+					"post-cache chain failed with "
+					"status %i (%#x).",
+					status, status);
+		}
+	}
+	else
+		fc_default_action (ds, vl);
+
+	return (0);
+} /* int plugin_dispatch_values */
+
+int plugin_dispatch_notification (const notification_t *notif)
+{
+	int (*callback) (const notification_t *);
+	llentry_t *le;
+	/* Possible TODO: Add flap detection here */
+
+	DEBUG ("plugin_dispatch_notification: severity = %i; message = %s; "
+			"time = %u; host = %s;",
+			notif->severity, notif->message,
+			(unsigned int) notif->time, notif->host);
+
+	/* Nobody cares for notifications */
+	if (list_notification == NULL)
+		return (-1);
+
+	le = llist_head (list_notification);
 	while (le != NULL)
 	{
-		callback = (int (*) (const data_set_t *, const value_list_t *)) le->value;
-		(*callback) (ds, vl);
+		callback = (int (*) (const notification_t *)) le->value;
+		(*callback) (notif);
 
 		le = le->next;
 	}
 
 	return (0);
-} /* int plugin_dispatch_values */
+} /* int plugin_dispatch_notification */
 
 void plugin_log (int level, const char *format, ...)
 {
-	char msg[512];
+	char msg[1024];
 	va_list ap;
 
 	void (*callback) (int, const char *);
@@ -707,8 +991,8 @@ void plugin_log (int level, const char *format, ...)
 #endif
 
 	va_start (ap, format);
-	vsnprintf (msg, 512, format, ap);
-	msg[511] = '\0';
+	vsnprintf (msg, sizeof (msg), format, ap);
+	msg[sizeof (msg) - 1] = '\0';
 	va_end (ap);
 
 	le = llist_head (list_log);
@@ -721,66 +1005,191 @@ void plugin_log (int level, const char *format, ...)
 	}
 } /* void plugin_log */
 
-void plugin_complain (int level, complain_t *c, const char *format, ...)
+const data_set_t *plugin_get_ds (const char *name)
 {
-	char message[512];
-	va_list ap;
+	data_set_t *ds;
 
-	if (c->delay > 0)
+	if (c_avl_get (data_sets, name, (void *) &ds) != 0)
 	{
-		c->delay--;
-		return;
+		DEBUG ("No such dataset registered: %s", name);
+		return (NULL);
 	}
 
-	if (c->interval < interval_g)
-		c->interval = interval_g;
-	else
-		c->interval *= 2;
-
-	if (c->interval > 86400)
-		c->interval = 86400;
-
-	c->delay = c->interval / interval_g;
-
-	va_start (ap, format);
-	vsnprintf (message, 512, format, ap);
-	message[511] = '\0';
-	va_end (ap);
+	return (ds);
+} /* data_set_t *plugin_get_ds */
 
-	plugin_log (level, message);
+static int plugin_notification_meta_add (notification_t *n,
+    const char *name,
+    enum notification_meta_type_e type,
+    const void *value)
+{
+  notification_meta_t *meta;
+  notification_meta_t *tail;
+
+  if ((n == NULL) || (name == NULL) || (value == NULL))
+  {
+    ERROR ("plugin_notification_meta_add: A pointer is NULL!");
+    return (-1);
+  }
+
+  meta = (notification_meta_t *) malloc (sizeof (notification_meta_t));
+  if (meta == NULL)
+  {
+    ERROR ("plugin_notification_meta_add: malloc failed.");
+    return (-1);
+  }
+  memset (meta, 0, sizeof (notification_meta_t));
+
+  sstrncpy (meta->name, name, sizeof (meta->name));
+  meta->type = type;
+
+  switch (type)
+  {
+    case NM_TYPE_STRING:
+    {
+      meta->nm_value.nm_string = strdup ((const char *) value);
+      if (meta->nm_value.nm_string == NULL)
+      {
+        ERROR ("plugin_notification_meta_add: strdup failed.");
+        sfree (meta);
+        return (-1);
+      }
+      break;
+    }
+    case NM_TYPE_SIGNED_INT:
+    {
+      meta->nm_value.nm_signed_int = *((int64_t *) value);
+      break;
+    }
+    case NM_TYPE_UNSIGNED_INT:
+    {
+      meta->nm_value.nm_unsigned_int = *((uint64_t *) value);
+      break;
+    }
+    case NM_TYPE_DOUBLE:
+    {
+      meta->nm_value.nm_double = *((double *) value);
+      break;
+    }
+    case NM_TYPE_BOOLEAN:
+    {
+      meta->nm_value.nm_boolean = *((bool *) value);
+      break;
+    }
+    default:
+    {
+      ERROR ("plugin_notification_meta_add: Unknown type: %i", type);
+      sfree (meta);
+      return (-1);
+    }
+  } /* switch (type) */
+
+  meta->next = NULL;
+  tail = n->meta;
+  while ((tail != NULL) && (tail->next != NULL))
+    tail = tail->next;
+
+  if (tail == NULL)
+    n->meta = meta;
+  else
+    tail->next = meta;
+
+  return (0);
+} /* int plugin_notification_meta_add */
+
+int plugin_notification_meta_add_string (notification_t *n,
+    const char *name,
+    const char *value)
+{
+  return (plugin_notification_meta_add (n, name, NM_TYPE_STRING, value));
 }
 
-void plugin_relief (int level, complain_t *c, const char *format, ...)
+int plugin_notification_meta_add_signed_int (notification_t *n,
+    const char *name,
+    int64_t value)
 {
-	char message[512];
-	va_list ap;
-
-	if (c->interval == 0)
-		return;
-
-	c->interval = 0;
-
-	va_start (ap, format);
-	vsnprintf (message, 512, format, ap);
-	message[511] = '\0';
-	va_end (ap);
-
-	plugin_log (level, message);
+  return (plugin_notification_meta_add (n, name, NM_TYPE_SIGNED_INT, &value));
 }
 
-const data_set_t *plugin_get_ds (const char *name)
+int plugin_notification_meta_add_unsigned_int (notification_t *n,
+    const char *name,
+    uint64_t value)
 {
-	data_set_t *ds;
-	llentry_t *le;
+  return (plugin_notification_meta_add (n, name, NM_TYPE_UNSIGNED_INT, &value));
+}
 
-	le = llist_search (list_data_set, name);
-	if (le == NULL)
-	{
-		DEBUG ("No such dataset registered: %s", name);
-		return (NULL);
-	}
+int plugin_notification_meta_add_double (notification_t *n,
+    const char *name,
+    double value)
+{
+  return (plugin_notification_meta_add (n, name, NM_TYPE_DOUBLE, &value));
+}
 
-	ds = (data_set_t *) le->value;
+int plugin_notification_meta_add_boolean (notification_t *n,
+    const char *name,
+    bool value)
+{
+  return (plugin_notification_meta_add (n, name, NM_TYPE_BOOLEAN, &value));
+}
 
-	return (ds);
-} /* data_set_t *plugin_get_ds */
+int plugin_notification_meta_copy (notification_t *dst,
+    const notification_t *src)
+{
+  notification_meta_t *meta;
+
+  assert (dst != NULL);
+  assert (src != NULL);
+  assert (dst != src);
+  assert ((src->meta == NULL) || (src->meta != dst->meta));
+
+  for (meta = src->meta; meta != NULL; meta = meta->next)
+  {
+    if (meta->type == NM_TYPE_STRING)
+      plugin_notification_meta_add_string (dst, meta->name,
+          meta->nm_value.nm_string);
+    else if (meta->type == NM_TYPE_SIGNED_INT)
+      plugin_notification_meta_add_signed_int (dst, meta->name,
+          meta->nm_value.nm_signed_int);
+    else if (meta->type == NM_TYPE_UNSIGNED_INT)
+      plugin_notification_meta_add_unsigned_int (dst, meta->name,
+          meta->nm_value.nm_unsigned_int);
+    else if (meta->type == NM_TYPE_DOUBLE)
+      plugin_notification_meta_add_double (dst, meta->name,
+          meta->nm_value.nm_double);
+    else if (meta->type == NM_TYPE_BOOLEAN)
+      plugin_notification_meta_add_boolean (dst, meta->name,
+          meta->nm_value.nm_boolean);
+  }
+
+  return (0);
+} /* int plugin_notification_meta_copy */
+
+int plugin_notification_meta_free (notification_t *n)
+{
+  notification_meta_t *this;
+  notification_meta_t *next;
+
+  if (n == NULL)
+  {
+    ERROR ("plugin_notification_meta_free: n == NULL!");
+    return (-1);
+  }
+
+  this = n->meta;
+  n->meta = NULL;
+  while (this != NULL)
+  {
+    next = this->next;
+
+    if (this->type == NM_TYPE_STRING)
+    {
+      free ((char *)this->nm_value.nm_string);
+      this->nm_value.nm_string = NULL;
+    }
+    sfree (this);
+
+    this = next;
+  }
+
+  return (0);
+} /* int plugin_notification_meta_free */