Address review comments:

[collectd.git] / src / daemon / meta_data.c

diff --git a/src/daemon/meta_data.c b/src/daemon/meta_data.c
index 9e4fd07..d26570e 100644 (file)
--- a/src/daemon/meta_data.c
+++ b/src/daemon/meta_data.c
@@ -26,9 +26,12 @@
 
 #include "collectd.h"
 
+#include "common.h"
 #include "plugin.h"
 #include "meta_data.h"
 
+#define MD_MAX_NONSTRING_CHARS 128
+
 /*
  * Data types
  */
@@ -729,4 +732,66 @@ int meta_data_get_boolean (meta_data_t *md, /* {{{ */
   return (0);
 } /* }}} int meta_data_get_boolean */
 
+int meta_data_as_string (meta_data_t *md, /* {{{ */
+    const char *key, char **value)
+{
+  meta_entry_t *e;
+  char *actual;
+  char buffer[MD_MAX_NONSTRING_CHARS];  /* For non-string types. */
+  char *temp;
+
+  if ((md == NULL) || (key == NULL) || (value == NULL))
+    return (-EINVAL);
+
+  pthread_mutex_lock (&md->lock);
+
+  e = md_entry_lookup (md, key);
+  if (e == NULL)
+  {
+    pthread_mutex_unlock (&md->lock);
+    return (-ENOENT);
+  }
+
+  switch (e->type)
+  {
+    case MD_TYPE_STRING:
+      actual = e->value.mv_string;
+      break;
+    case MD_TYPE_SIGNED_INT:
+      ssnprintf (buffer, sizeof (buffer), "%"PRIi64, e->value.mv_signed_int);
+      actual = buffer;
+      break;
+    case MD_TYPE_UNSIGNED_INT:
+      ssnprintf (buffer, sizeof (buffer), "%"PRIu64, e->value.mv_unsigned_int);
+      actual = buffer;
+      break;
+    case MD_TYPE_DOUBLE:
+      ssnprintf (buffer, sizeof (buffer), GAUGE_FORMAT, e->value.mv_double);
+      actual = buffer;
+      break;
+    case MD_TYPE_BOOLEAN:
+      actual = e->value.mv_boolean ? "true" : "false";
+      break;
+    default:
+      pthread_mutex_unlock (&md->lock);
+      ERROR ("meta_data_as_string: unknown type %d for key `%s'",
+          e->type, e->key);
+      return (-ENOENT);
+  }
+
+  temp = md_strdup (actual);
+  if (temp == NULL)
+  {
+    pthread_mutex_unlock (&md->lock);
+    ERROR ("meta_data_as_string: md_strdup failed for key `%s'.", e->key);
+    return (-ENOMEM);
+  }
+
+  pthread_mutex_unlock (&md->lock);
+
+  *value = temp;
+
+  return (0);
+} /* }}} int meta_data_as_string */
+
 /* vim: set sw=2 sts=2 et fdm=marker : */