X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=src%2Fplugin.c;h=1dd6daf33a9963ef18a897fc5e4221308c3ba80e;hb=bea27e81ec6fee7eb075e95752e930dd959ec00f;hp=74a6e5ebb44f3571dde6a92f8661c8d565e5d8b7;hpb=273658710431323d206dd7ed9568fae81ed59664;p=collectd.git

diff --git a/src/plugin.c b/src/plugin.c
index 74a6e5eb..1dd6daf3 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -23,10 +23,17 @@
 
 #include <ltdl.h>
 
+#if HAVE_PTHREAD_H
+# include <pthread.h>
+#endif
+
 #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"
 
 /*
  * Private structures
@@ -36,6 +43,7 @@ struct read_func_s
 	int wait_time;
 	int wait_left;
 	int (*callback) (void);
+	enum { DONE = 0, TODO = 1, ACTIVE = 2 } needs_read;
 };
 typedef struct read_func_s read_func_t;
 
@@ -46,11 +54,19 @@ static llist_t *list_init;
 static llist_t *list_read;
 static llist_t *list_write;
 static llist_t *list_shutdown;
-static llist_t *list_data_set;
 static llist_t *list_log;
+static llist_t *list_notification;
+
+static c_avl_tree_t *data_sets;
 
 static char *plugindir = NULL;
 
+static int             read_loop = 1;
+static pthread_mutex_t read_lock = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t  read_cond = PTHREAD_COND_INITIALIZER;
+static pthread_t      *read_threads = NULL;
+static int             read_threads_num = 0;
+
 /*
  * Static functions
  */
@@ -65,6 +81,7 @@ 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))
@@ -73,9 +90,16 @@ 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);
 	}
@@ -97,6 +121,7 @@ static int plugin_unregister (llist_t *list, const char *name)
 		return (-1);
 
 	llist_remove (list, e);
+	free (e->key);
 	llentry_destroy (e);
 
 	return (0);
@@ -122,7 +147,7 @@ static int plugin_load_file (char *file)
 		const char *error = lt_dlerror ();
 
 		ERROR ("lt_dlopen failed: %s", error);
-		DEBUG ("lt_dlopen failed: %s", error);
+		fprintf (stderr, "lt_dlopen failed: %s\n", error);
 		return (1);
 	}
 
@@ -139,6 +164,130 @@ static int plugin_load_file (char *file)
 	return (0);
 }
 
+static void *plugin_read_thread (void *args)
+{
+	llentry_t   *le;
+	read_func_t *rf;
+	int          status;
+	int          done;
+
+	pthread_mutex_lock (&read_lock);
+
+	while (read_loop != 0)
+	{
+		le = llist_head (list_read);
+		done = 0;
+
+		while ((read_loop != 0) && (le != NULL))
+		{
+			rf = (read_func_t *) le->value;
+
+			if (rf->needs_read != TODO)
+			{
+				le = le->next;
+				continue;
+			}
+
+			/* We will do this read function */
+			rf->needs_read = ACTIVE;
+
+			DEBUG ("[thread #%5lu] plugin: plugin_read_thread: Handling %s",
+					(unsigned long int) pthread_self (), le->key);
+			pthread_mutex_unlock (&read_lock);
+
+			status = rf->callback ();
+			done++;
+
+			if (status != 0)
+			{
+				if (rf->wait_time < interval_g)
+					rf->wait_time = interval_g;
+				rf->wait_left = rf->wait_time;
+				rf->wait_time = rf->wait_time * 2;
+				if (rf->wait_time > 86400)
+					rf->wait_time = 86400;
+
+				NOTICE ("read-function of plugin `%s' "
+						"failed. Will suspend it for %i "
+						"seconds.", le->key, rf->wait_left);
+			}
+			else
+			{
+				rf->wait_left = 0;
+				rf->wait_time = interval_g;
+			}
+
+			pthread_mutex_lock (&read_lock);
+
+			rf->needs_read = DONE;
+			le = le->next;
+		} /* while (le != NULL) */
+
+		if ((read_loop != 0) && (done == 0))
+		{
+			DEBUG ("[thread #%5lu] plugin: plugin_read_thread: Waiting on read_cond.",
+					(unsigned long int) pthread_self ());
+			pthread_cond_wait (&read_cond, &read_lock);
+		}
+	} /* while (read_loop) */
+
+	pthread_mutex_unlock (&read_lock);
+
+	pthread_exit (NULL);
+} /* void *plugin_read_thread */
+
+static void start_threads (int num)
+{
+	int i;
+
+	if (read_threads != NULL)
+		return;
+
+	read_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
+	if (read_threads == NULL)
+	{
+		ERROR ("plugin: start_threads: calloc failed.");
+		return;
+	}
+
+	read_threads_num = 0;
+	for (i = 0; i < num; i++)
+	{
+		if (pthread_create (read_threads + read_threads_num, NULL,
+					plugin_read_thread, NULL) == 0)
+		{
+			read_threads_num++;
+		}
+		else
+		{
+			ERROR ("plugin: start_threads: pthread_create failed.");
+			return;
+		}
+	} /* for (i) */
+} /* void start_threads */
+
+static void stop_threads (void)
+{
+	int i;
+
+	pthread_mutex_lock (&read_lock);
+	read_loop = 0;
+	DEBUG ("plugin: stop_threads: Signalling `read_cond'");
+	pthread_cond_broadcast (&read_cond);
+	pthread_mutex_unlock (&read_lock);
+
+	for (i = 0; i < read_threads_num; i++)
+	{
+		if (pthread_join (read_threads[i], NULL) != 0)
+		{
+			ERROR ("plugin: stop_threads: pthread_join failed.");
+		}
+		read_threads[i] = (pthread_t) 0;
+	}
+	sfree (read_threads);
+	read_threads_num = 0;
+} /* void stop_threads */
+
 /*
  * Public functions
  */
@@ -221,6 +370,10 @@ int plugin_load (const char *type)
 			ret = 0;
 			break;
 		}
+		else
+		{
+			fprintf (stderr, "Unable to load plugin %s.\n", type);
+		}
 	}
 
 	closedir (dh);
@@ -239,6 +392,12 @@ int plugin_register_config (const char *name,
 	return (0);
 } /* int plugin_register_config */
 
+int plugin_register_complex_config (const char *type,
+		int (*callback) (oconfig_item_t *))
+{
+	return (cf_register_complex (type, callback));
+} /* int plugin_register_complex_config */
+
 int plugin_register_init (const char *name,
 		int (*callback) (void))
 {
@@ -260,9 +419,10 @@ int plugin_register_read (const char *name,
 	}
 
 	memset (rf, '\0', sizeof (read_func_t));
-	rf->wait_time = atoi (COLLECTD_STEP);
+	rf->wait_time = interval_g;
 	rf->wait_left = 0;
 	rf->callback = callback;
+	rf->needs_read = DONE;
 
 	return (register_callback (&list_read, name, (void *) rf));
 } /* int plugin_register_read */
@@ -281,7 +441,39 @@ int plugin_register_shutdown (char *name,
 
 int plugin_register_data_set (const data_set_t *ds)
 {
-	return (register_callback (&list_data_set, ds->type, (void *) ds));
+	data_set_t *ds_copy;
+	int i;
+
+	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)
+		return (-1);
+	memcpy(ds_copy, ds, sizeof (data_set_t));
+
+	ds_copy->ds = (data_source_t *) malloc (sizeof (data_source_t)
+			* ds->ds_num);
+	if (ds_copy->ds == NULL)
+	{
+		free (ds_copy);
+		return (-1);
+	}
+
+	for (i = 0; i < ds->ds_num; i++)
+		memcpy (ds_copy->ds + i, ds->ds + i, sizeof (data_source_t));
+
+	return (c_avl_insert (data_sets, (void *) ds_copy->type, (void *) ds_copy));
 } /* int plugin_register_data_set */
 
 int plugin_register_log (char *name,
@@ -290,6 +482,24 @@ 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);
+	return (0);
+} /* int plugin_unregister_config */
+
+int plugin_unregister_complex_config (const char *name)
+{
+	cf_unregister_complex (name);
+	return (0);
+} /* int plugin_unregister_complex_config */
+
 int plugin_unregister_init (const char *name)
 {
 	return (plugin_unregister (list_init, name));
@@ -297,7 +507,6 @@ int plugin_unregister_init (const char *name)
 
 int plugin_unregister_read (const char *name)
 {
-	return (plugin_unregister (list_read, name));
 	llentry_t *e;
 
 	e = llist_search (list_read, name);
@@ -307,6 +516,7 @@ int plugin_unregister_read (const char *name)
 
 	llist_remove (list_read, e);
 	free (e->value);
+	free (e->key);
 	llentry_destroy (e);
 
 	return (0);
@@ -324,35 +534,65 @@ int plugin_unregister_shutdown (const char *name)
 
 int plugin_unregister_data_set (const char *name)
 {
-	return (plugin_unregister (list_data_set, name));
-}
+	data_set_t *ds;
+
+	if (data_sets == NULL)
+		return (-1);
+
+	if (c_avl_remove (data_sets, name, NULL, (void *) &ds) != 0)
+		return (-1);
+
+	sfree (ds->ds);
+	sfree (ds);
+
+	return (0);
+} /* int plugin_unregister_data_set */
 
 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)
 {
 	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 ();
+
 	if (list_init == NULL)
 		return;
 
 	le = llist_head (list_init);
 	while (le != NULL)
 	{
-		callback = le->value;
+		callback = (int (*) (void)) le->value;
 		status = (*callback) ();
 
 		if (status != 0)
 		{
 			ERROR ("Initialization of plugin `%s' "
 					"failed with status %i. "
-					"Plugin will be unloaded. TODO!",
+					"Plugin will be unloaded.",
 					le->key, status);
+			/* FIXME: Unload _all_ functions */
 			plugin_unregister_read (le->key);
 		}
 
@@ -360,51 +600,43 @@ void plugin_init_all (void)
 	}
 } /* void plugin_init_all */
 
-void plugin_read_all (const int *loop)
+void plugin_read_all (void)
 {
 	llentry_t   *le;
 	read_func_t *rf;
-	int          status;
-	int          step;
+
+	uc_check_timeout ();
 
 	if (list_read == NULL)
 		return;
 
-	step = atoi (COLLECTD_STEP);
+	pthread_mutex_lock (&read_lock);
 
 	le = llist_head (list_read);
-	while ((*loop == 0) && (le != NULL))
+	while (le != NULL)
 	{
 		rf = (read_func_t *) le->value;
 
-		if (rf->wait_left > 0)
-			rf->wait_left -= step;
-		if (rf->wait_left > 0)
+		if (rf->needs_read != DONE)
 		{
 			le = le->next;
 			continue;
 		}
 
-		status = rf->callback ();
-		if (status != 0)
-		{
-			rf->wait_left = rf->wait_time;
-			rf->wait_time = rf->wait_time * 2;
-			if (rf->wait_time > 86400)
-				rf->wait_time = 86400;
-
-			NOTICE ("read-function of plugin `%s' "
-					"failed. Will syspend it for %i "
-					"seconds.", le->key, rf->wait_left);
-		}
-		else
+		if (rf->wait_left > 0)
+			rf->wait_left -= interval_g;
+
+		if (rf->wait_left <= 0)
 		{
-			rf->wait_left = 0;
-			rf->wait_time = step;
+			rf->needs_read = TODO;
 		}
 
 		le = le->next;
-	} /* while ((*loop == 0) && (le != NULL)) */
+	}
+
+	DEBUG ("plugin: plugin_read_all: Signalling `read_cond'");
+	pthread_cond_broadcast (&read_cond);
+	pthread_mutex_unlock (&read_lock);
 } /* void plugin_read_all */
 
 void plugin_shutdown_all (void)
@@ -412,55 +644,109 @@ void plugin_shutdown_all (void)
 	int (*callback) (void);
 	llentry_t *le;
 
+	stop_threads ();
+
 	if (list_shutdown == NULL)
 		return;
 
 	le = llist_head (list_shutdown);
 	while (le != NULL)
 	{
-		callback = le->value;
-		(*callback) ();
+		callback = (int (*) (void)) le->value;
 
+		/* Advance the pointer before calling the callback allows
+		 * shutdown functions to unregister themselves. If done the
+		 * other way around the memory `le' points to will be freed
+		 * after callback returns. */
 		le = le->next;
+
+		(*callback) ();
 	}
 } /* void plugin_shutdown_all */
 
-int plugin_dispatch_values (const char *name, const value_list_t *vl)
+int plugin_dispatch_values (const char *name, value_list_t *vl)
 {
 	int (*callback) (const data_set_t *, const value_list_t *);
 	data_set_t *ds;
 	llentry_t *le;
 
-	if (list_write == NULL)
+	if ((list_write == NULL) || (data_sets == NULL))
 		return (-1);
 
-	le = llist_search (list_data_set, name);
-	if (le == NULL)
+	if (c_avl_get (data_sets, name, (void *) &ds) != 0)
 	{
 		DEBUG ("No such dataset registered: %s", name);
 		return (-1);
 	}
 
-	ds = (data_set_t *) le->value;
-
-	DEBUG ("time = %u; host = %s; "
+	DEBUG ("plugin: plugin_dispatch_values: time = %u; interval = %i; "
+			"host = %s; "
 			"plugin = %s; plugin_instance = %s; "
 			"type = %s; type_instance = %s;",
-			(unsigned int) vl->time, vl->host,
+			(unsigned int) vl->time, vl->interval,
+			vl->host,
 			vl->plugin, vl->plugin_instance,
 			ds->type, vl->type_instance);
 
+#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) != "
+				"(vl->values_len = %i)",
+				ds->type, ds->ds_num, vl->values_len);
+		return (-1);
+	}
+#endif
+
+	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_instance, sizeof (vl->type_instance));
+
+	/* Update the value cache */
+	uc_update (ds, vl);
+	ut_check_threshold (ds, vl);
+
 	le = llist_head (list_write);
 	while (le != NULL)
 	{
-		callback = le->value;
+		callback = (int (*) (const data_set_t *, const value_list_t *)) le->value;
 		(*callback) (ds, vl);
 
 		le = le->next;
 	}
 
 	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 notification_t *)) le->value;
+		(*callback) (notif);
+
+		le = le->next;
+	}
+
+	return (0);
+} /* int plugin_dispatch_notification */
 
 void plugin_log (int level, const char *format, ...)
 {
@@ -486,77 +772,22 @@ void plugin_log (int level, const char *format, ...)
 	le = llist_head (list_log);
 	while (le != NULL)
 	{
-		callback = le->value;
+		callback = (void (*) (int, const char *)) le->value;
 		(*callback) (level, msg);
 
 		le = le->next;
 	}
 } /* void plugin_log */
 
-void plugin_complain (int level, complain_t *c, const char *format, ...)
-{
-	char message[512];
-	va_list ap;
-	int step;
-
-	if (c->delay > 0)
-	{
-		c->delay--;
-		return;
-	}
-
-	step = atoi (COLLECTD_STEP);
-	assert (step > 0);
-
-	if (c->interval < step)
-		c->interval = step;
-	else
-		c->interval *= 2;
-
-	if (c->interval > 86400)
-		c->interval = 86400;
-
-	c->delay = c->interval / step;
-
-	va_start (ap, format);
-	vsnprintf (message, 512, format, ap);
-	message[511] = '\0';
-	va_end (ap);
-
-	plugin_log (level, message);
-}
-
-void plugin_relief (int level, complain_t *c, const char *format, ...)
-{
-	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);
-}
-
 const data_set_t *plugin_get_ds (const char *name)
 {
 	data_set_t *ds;
-	llentry_t *le;
 
-	le = llist_search (list_data_set, name);
-	if (le == NULL)
+	if (c_avl_get (data_sets, name, (void *) &ds) != 0)
 	{
 		DEBUG ("No such dataset registered: %s", name);
 		return (NULL);
 	}
 
-	ds = (data_set_t *) le->value;
-
 	return (ds);
 } /* data_set_t *plugin_get_ds */