1 files changed, 44 insertions, 0 deletions
diff --git a/database/rrdsetvar.h b/database/rrdsetvar.h
new file mode 100644
index 000000000..34a26d2f0
--- /dev/null
+++ b/database/rrdsetvar.h
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_RRDSETVAR_H
+#define NETDATA_RRDSETVAR_H 1
+
+#include "rrd.h"
+
+// variables linked to charts
+// We link variables to point to the values that are already
+// calculated / processed by the normal data collection process
+// This means, there will be no speed penalty for using
+// these variables
+
+struct rrdsetvar {
+    char *variable;                 // variable name
+    uint32_t hash;                  // variable name hash
+
+    char *key_fullid;               // chart type.chart id.variable
+    char *key_fullname;             // chart type.chart name.variable
+
+    RRDVAR_TYPE type;
+    void *value;
+
+    RRDVAR_OPTIONS options;
+
+    RRDVAR *var_local;
+    RRDVAR *var_family;
+    RRDVAR *var_host;
+    RRDVAR *var_family_name;
+    RRDVAR *var_host_name;
+
+    struct rrdset *rrdset;
+
+    struct rrdsetvar *next;
+};
+
+extern RRDSETVAR *rrdsetvar_custom_chart_variable_create(RRDSET *st, const char *name);
+extern void rrdsetvar_custom_chart_variable_set(RRDSETVAR *rv, calculated_number value);
+
+extern void rrdsetvar_rename_all(RRDSET *st);
+extern RRDSETVAR *rrdsetvar_create(RRDSET *st, const char *variable, RRDVAR_TYPE type, void *value, RRDVAR_OPTIONS options);
+extern void rrdsetvar_free(RRDSETVAR *rs);
+
+#endif //NETDATA_RRDSETVAR_H