src/filter_chain.[ch]: Implement the built-in `return' target.

[collectd.git] / src / filter_chain.c

diff --git a/src/filter_chain.c b/src/filter_chain.c
index b73d6e1..01cd224 100644 (file)
--- a/src/filter_chain.c
+++ b/src/filter_chain.c
@@ -91,9 +91,9 @@ struct fc_target_s
 }; /* }}} */
 
 /* List of rules, used in fc_chain_t */
-struct fc_fule_s;
-typedef struct fc_fule_s fc_rule_t; /* {{{ */
-struct fc_fule_s
+struct fc_rule_s;
+typedef struct fc_rule_s fc_rule_t; /* {{{ */
+struct fc_rule_s
 {
   char name[DATA_MAX_NAME_LEN];
   fc_match_t  *matches;
@@ -567,15 +567,15 @@ int fc_process_chain (const data_set_t *ds, value_list_t *vl, /* {{{ */
 
   DEBUG ("fc_process_chain (chain = %s);", chain->name);
 
-  status = FC_ACTION_CONTINUE;
-
+  status = FC_TARGET_CONTINUE;
   for (rule = chain->rules; rule != NULL; rule = rule->next)
   {
     fc_match_t *match;
 
     if (rule->name[0] != 0)
     {
-      DEBUG ("fc_process_chain: Testing the `%s' rule.", rule->name);
+      DEBUG ("fc_process_chain (%s): Testing the `%s' rule.",
+          chain->name, rule->name);
     }
 
     /* N. B.: rule->matches may be NULL. */
@@ -585,7 +585,7 @@ int fc_process_chain (const data_set_t *ds, value_list_t *vl, /* {{{ */
           &match->user_data);
       if (status < 0)
       {
-        WARNING ("fc_process_chain: A match failed.");
+        WARNING ("fc_process_chain (%s): A match failed.", chain->name);
         break;
       }
       else if (status != FC_MATCH_MATCHES)
@@ -594,11 +594,15 @@ int fc_process_chain (const data_set_t *ds, value_list_t *vl, /* {{{ */
 
     /* for-loop has been aborted: Either error or no match. */
     if (match != NULL)
+    {
+      status = FC_TARGET_CONTINUE;
       continue;
+    }
 
     if (rule->name[0] != 0)
     {
-      DEBUG ("fc_process_chain: Rule `%s' matches.", rule->name);
+      DEBUG ("fc_process_chain (%s): Rule `%s' matches.",
+          chain->name, rule->name);
     }
 
     for (target = rule->targets; target != NULL; target = target->next)
@@ -609,34 +613,54 @@ int fc_process_chain (const data_set_t *ds, value_list_t *vl, /* {{{ */
           &target->user_data);
       if (status < 0)
       {
-        WARNING ("fc_process_chain: A target failed.");
+        WARNING ("fc_process_chain (%s): A target failed.", chain->name);
         continue;
       }
-      else if (status == FC_ACTION_CONTINUE)
+      else if (status == FC_TARGET_CONTINUE)
         continue;
-      else if (status == FC_ACTION_STOP)
+      else if (status == FC_TARGET_STOP)
+        break;
+      else if (status == FC_TARGET_RETURN)
         break;
       else
       {
-        WARNING ("fc_process_chain: Unknown target return value: %i", status);
+        WARNING ("fc_process_chain (%s): Unknown return value "
+            "from target `%s': %i",
+            chain->name, target->name, status);
       }
     }
 
-    if (status == FC_ACTION_STOP)
+    if ((status == FC_TARGET_STOP)
+        || (status == FC_TARGET_RETURN))
     {
       if (rule->name[0] != 0)
       {
-        DEBUG ("fc_process_chain: Rule `%s' signaled the stop condition.",
-            rule->name);
+        DEBUG ("fc_process_chain (%s): Rule `%s' signaled "
+            "the %s condition.",
+            chain->name, rule->name,
+            (status == FC_TARGET_STOP) ? "stop" : "return");
       }
       break;
     }
+    else
+    {
+      status = FC_TARGET_CONTINUE;
+    }
   } /* for (rule) */
 
-  /* for-loop has been aborted: A target returned `FC_ACTION_STOP' */
+  if (status == FC_TARGET_STOP)
+    return (FC_TARGET_STOP);
+  else if (status == FC_TARGET_RETURN)
+    return (FC_TARGET_CONTINUE);
+
+  /* for-loop has been aborted: A target returned `FC_TARGET_STOP' */
   if (rule != NULL)
-    return (0);
+    return (FC_TARGET_CONTINUE);
+
+  DEBUG ("fc_process_chain (%s): Executing the default targets.",
+      chain->name);
 
+  status = FC_TARGET_CONTINUE;
   for (target = chain->targets; target != NULL; target = target->next)
   {
     /* If we get here, all matches have matched the value. Execute the
@@ -645,11 +669,41 @@ int fc_process_chain (const data_set_t *ds, value_list_t *vl, /* {{{ */
         &target->user_data);
     if (status < 0)
     {
-      WARNING ("fc_process_chain: The default target failed.");
+      WARNING ("fc_process_chain (%s): The default target failed.",
+          chain->name);
+    }
+    else if (status == FC_TARGET_CONTINUE)
+      continue;
+    else if (status == FC_TARGET_STOP)
+      break;
+    else if (status == FC_TARGET_RETURN)
+      break;
+    else
+    {
+      WARNING ("fc_process_chain (%s): Unknown return value "
+          "from target `%s': %i",
+          chain->name, target->name, status);
     }
   }
 
-  return (0);
+  if ((status == FC_TARGET_STOP)
+      || (status == FC_TARGET_RETURN))
+  {
+    assert (target != NULL);
+    DEBUG ("fc_process_chain (%s): Default target `%s' signaled "
+        "the %s condition.",
+        chain->name, target->name,
+        (status == FC_TARGET_STOP) ? "stop" : "return");
+    if (status == FC_TARGET_STOP)
+      return (FC_TARGET_STOP);
+    else
+      return (FC_TARGET_CONTINUE);
+  }
+
+  DEBUG ("fc_process_chain (%s): Signaling `continue' at end of chain.",
+      chain->name);
+
+  return (FC_TARGET_CONTINUE);
 } /* }}} int fc_process_chain */
 
 /*
@@ -730,16 +784,24 @@ static int fc_bit_jump_invoke (const data_set_t *ds, /* {{{ */
   status = fc_process_chain (ds, vl, chain);
   if (status < 0)
     return (status);
-
-  return (FC_ACTION_CONTINUE);
+  else if (status == FC_TARGET_STOP)
+    return (FC_TARGET_STOP);
+  else
+    return (FC_TARGET_CONTINUE);
 } /* }}} int fc_bit_jump_invoke */
 
 static int fc_bit_stop_invoke (const data_set_t *ds, /* {{{ */
     value_list_t *vl, notification_meta_t **meta, void **user_data)
 {
-  return (FC_ACTION_STOP);
+  return (FC_TARGET_STOP);
 } /* }}} int fc_bit_stop_invoke */
 
+static int fc_bit_return_invoke (const data_set_t *ds, /* {{{ */
+    value_list_t *vl, notification_meta_t **meta, void **user_data)
+{
+  return (FC_TARGET_RETURN);
+} /* }}} int fc_bit_return_invoke */
+
 static int fc_bit_write_create (const oconfig_item_t *ci, /* {{{ */
     void **user_data)
 {
@@ -850,7 +912,7 @@ static int fc_bit_write_invoke (const data_set_t *ds, /* {{{ */
     } /* for (i = 0; plugin_list[i] != NULL; i++) */
   }
 
-  return (FC_ACTION_CONTINUE);
+  return (FC_TARGET_CONTINUE);
 } /* }}} int fc_bit_write_invoke */
 
 static int fc_init_once (void) /* {{{ */
@@ -874,6 +936,12 @@ static int fc_init_once (void) /* {{{ */
   fc_register_target ("stop", tproc);
 
   memset (&tproc, 0, sizeof (tproc));
+  tproc.create  = NULL;
+  tproc.destroy = NULL;
+  tproc.invoke  = fc_bit_return_invoke;
+  fc_register_target ("return", tproc);
+
+  memset (&tproc, 0, sizeof (tproc));
   tproc.create  = fc_bit_write_create;
   tproc.destroy = fc_bit_write_destroy;
   tproc.invoke  = fc_bit_write_invoke;