lua: support metatable to save table type

Signed-off-by: Takahiro Yamashita <[email protected]>
fluent · Sep 23, 2023 · 7ebe7a2 · 7ebe7a2
1 parent af081bf
commit 7ebe7a2
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Showing 2 changed files with 239 additions and 60 deletions.
diff --git a/include/fluent-bit/flb_lua.h b/include/fluent-bit/flb_lua.h
@@ -36,7 +36,8 @@
 
 enum flb_lua_l2c_type_enum {
     FLB_LUA_L2C_TYPE_INT,
-    FLB_LUA_L2C_TYPE_ARRAY
+    FLB_LUA_L2C_TYPE_ARRAY,
+    FLB_LUA_L2C_TYPE_MAP
 };
 
 struct flb_lua_l2c_type {
@@ -50,6 +51,27 @@ struct flb_lua_l2c_config {
     struct mk_list l2c_types;  /* data types (lua -> C) */
 };
 
+
+/*
+ * Metatable for Lua table.
+ * https://www.lua.org/manual/5.1/manual.html#2.8
+ */
+struct flb_lua_metadata {
+    int initialized;
+    int data_type; /* Map or Array */
+};
+
+static inline int flb_lua_metadata_init(struct flb_lua_metadata *meta)
+{
+    if (meta == NULL) {
+        return -1;
+    }
+    meta->initialized = FLB_TRUE;
+    meta->data_type = -1;
+
+    return 0;
+}
+
 /* convert from negative index to positive index */
 static inline int flb_lua_absindex(lua_State *l , int index)
 {