src/plugin.c: Implemented delaying of read-functions that fail.

The usual quadratic increase of delay-intervals is being used to disable the
function for up to 24 hours.

diff --git a/src/plugin.c b/src/plugin.c
index df2eb6b..2daeea9 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;
@@ -87,6 +98,7 @@ static int plugin_unregister (llist_t *list, const char *name)
                return (-1);
 
        llist_remove (list, e);
+       llentry_destroy (e);
 
        return (0);
 } /* int plugin_unregister */
@@ -229,7 +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,
@@ -257,6 +284,18 @@ 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);
+
+       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)
@@ -296,20 +335,49 @@ 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)

diff --git a/src/unixsock.c b/src/unixsock.c
index b2663f1..de1fa4f 100644 (file)
--- a/src/unixsock.c
+++ b/src/unixsock.c
@@ -660,6 +660,10 @@ static int us_shutdown (void)
                pthread_join (listen_thread, &ret);
        }
 
+       plugin_unregister_init ("unixsock");
+       plugin_unregister_write ("unixsock");
+       plugin_unregister_shutdown ("unixsock");
+
        return (0);
 } /* int us_shutdown */