From 9ac03988a7a3ad7fcae1e16cb97be422ed9d36a2 Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@huhu.verplant.org>
Date: Fri, 21 Nov 2008 22:06:23 +0100
Subject: [PATCH] src/plugin.[ch]: Implement `plugin_write', a function to pass
 values to specific write plugins.

This function does none of the magic `plugin_dispatch_value' does. It simiply
takes a value and passes it to the requested plugin.

This function is intended to be used with the upcoming `filter chain' code,
which will allow to pass values to specific plugins only.
---
 src/plugin.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/plugin.h | 30 +++++++++++++++++++++++++++
 2 files changed, 97 insertions(+)

diff --git a/src/plugin.c b/src/plugin.c
index 4d503f7c..b0043362 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -677,6 +677,73 @@ void plugin_read_all (void)
 	pthread_mutex_unlock (&read_lock);
 } /* void plugin_read_all */
 
+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_flush);
+    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_flush);
+    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);
diff --git a/src/plugin.h b/src/plugin.h
index b90811cf..91a61b2e 100644
--- a/src/plugin.h
+++ b/src/plugin.h
@@ -183,6 +183,36 @@ void plugin_init_all (void);
 void plugin_read_all (void);
 void plugin_shutdown_all (void);
 
+/*
+ * NAME
+ *  plugin_write
+ *
+ * DESCRIPTION
+ *  Calls the write function of the given plugin with the provided data set and
+ *  value list. It differs from `plugin_dispatch_value' in that it does not
+ *  update the cache, does no do threshold checking, call the chain subsystem
+ *  and so on. It looks up the requested plugin and invokes the function, end
+ *  of story.
+ *
+ * ARGUMENTS
+ *  plugin     Name of the plugin. If NULL, the value is sent to all registered
+ *             write functions.
+ *  ds         Pointer to the data_set_t structure. If NULL, the data set is
+ *             looked up according to the `type' member in the `vl' argument.
+ *  vl         The actual value to be processes. Must not be NULL.
+ *
+ * RETURN VALUE
+ *  Returns zero upon success or non-zero if an error occurred. If `plugin' is
+ *  NULL and more than one plugin is called, an error is only returned if *all*
+ *  plugins fail.
+ *
+ * NOTES
+ *  This is the function used by the `write' built-in target. May be used by
+ *  other target plugins.
+ */
+int plugin_write (const char *plugin,
+    const data_set_t *ds, const value_list_t *vl);
+
 int plugin_flush (const char *plugin, int timeout, const char *identifier);
 
 /*
-- 
2.11.0