src/common.c: Removed the (extern) variable `operating_mode'.

[collectd.git] / src / plugin.c

diff --git a/src/plugin.c b/src/plugin.c
index b40d62a..1a029e4 100644 (file)
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -29,6 +29,17 @@
 #include "utils_debug.h"
 
 /*
+ * Private structures
+ */
+struct read_func_s
+{
+       int wait_time;
+       int wait_left;
+       int (*callback) (void);
+};
+typedef struct read_func_s read_func_t;
+
+/*
  * Private variables
  */
 static llist_t *list_init;
@@ -77,6 +88,21 @@ static int register_callback (llist_t **list, const char *name, void *callback)
        return (0);
 } /* int register_callback */
 
+static int plugin_unregister (llist_t *list, const char *name)
+{
+       llentry_t *e;
+
+       e = llist_search (list, name);
+
+       if (e == NULL)
+               return (-1);
+
+       llist_remove (list, e);
+       llentry_destroy (e);
+
+       return (0);
+} /* int plugin_unregister */
+
 /*
  * (Try to) load the shared object `file'. Won't complain if it isn't a shared
  * object, but it will bitch about a shared object not having a
@@ -215,7 +241,22 @@ int plugin_register_init (const char *name,
 int plugin_register_read (const char *name,
                int (*callback) (void))
 {
-       return (register_callback (&list_read, name, (void *) callback));
+       read_func_t *rf;
+
+       rf = (read_func_t *) malloc (sizeof (read_func_t));
+       if (rf == NULL)
+       {
+               syslog (LOG_ERR, "plugin_register_read: malloc failed: %s",
+                               strerror (errno));
+               return (-1);
+       }
+
+       memset (rf, '\0', sizeof (read_func_t));
+       rf->wait_time = atoi (COLLECTD_STEP);
+       rf->wait_left = 0;
+       rf->callback = callback;
+
+       return (register_callback (&list_read, name, (void *) rf));
 } /* int plugin_register_read */
 
 int plugin_register_write (const char *name,
@@ -235,10 +276,48 @@ int plugin_register_data_set (const data_set_t *ds)
        return (register_callback (&list_data_set, ds->type, (void *) ds));
 } /* int plugin_register_data_set */
 
+int plugin_unregister_init (const char *name)
+{
+       return (plugin_unregister (list_init, name));
+}
+
+int plugin_unregister_read (const char *name)
+{
+       return (plugin_unregister (list_read, name));
+       llentry_t *e;
+
+       e = llist_search (list_read, name);
+
+       if (e == NULL)
+               return (-1);
+
+       llist_remove (list_read, e);
+       free (e->value);
+       llentry_destroy (e);
+
+       return (0);
+}
+
+int plugin_unregister_write (const char *name)
+{
+       return (plugin_unregister (list_write, name));
+}
+
+int plugin_unregister_shutdown (const char *name)
+{
+       return (plugin_unregister (list_shutdown, name));
+}
+
+int plugin_unregister_data_set (const char *name)
+{
+       return (plugin_unregister (list_data_set, name));
+}
+
 void plugin_init_all (void)
 {
        int (*callback) (void);
        llentry_t *le;
+       int status;
 
        gethostname (hostname, sizeof (hostname));
 
@@ -249,7 +328,16 @@ void plugin_init_all (void)
        while (le != NULL)
        {
                callback = le->value;
-               (*callback) ();
+               status = (*callback) ();
+
+               if (status != 0)
+               {
+                       syslog (LOG_ERR, "Initialization of plugin `%s' "
+                                       "failed with status %i. "
+                                       "Plugin will be unloaded. TODO!",
+                                       le->key, status);
+                       plugin_unregister_read (le->key);
+               }
 
                le = le->next;
        }
@@ -257,20 +345,49 @@ void plugin_init_all (void)
 
 void plugin_read_all (const int *loop)
 {
-       int (*callback) (void);
-       llentry_t *le;
+       llentry_t   *le;
+       read_func_t *rf;
+       int          status;
+       int          step;
 
        if (list_read == NULL)
                return;
 
+       step = atoi (COLLECTD_STEP);
+
        le = llist_head (list_read);
        while ((*loop == 0) && (le != NULL))
        {
-               callback = le->value;
-               (*callback) ();
+               rf = (read_func_t *) le->value;
+
+               if (rf->wait_left > 0)
+                       rf->wait_left -= step;
+               if (rf->wait_left > 0)
+               {
+                       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;
+
+                       syslog (LOG_NOTICE, "read-function of plugin `%s' "
+                                       "failed. Will syspend it for %i "
+                                       "seconds.", le->key, rf->wait_left);
+               }
+               else
+               {
+                       rf->wait_left = 0;
+                       rf->wait_time = step;
+               }
 
                le = le->next;
-       }
+       } /* while ((*loop == 0) && (le != NULL)) */
 } /* void plugin_read_all */
 
 void plugin_shutdown_all (void)