src: disable raise in cfg

NO_CHANGELOG=internal
NO_DOC=internal
NO_TEST=internal

Needed for tarantool#6128

src/cfg.c

@@ -36,12 +36,42 @@
 
 enum { MAX_OPT_NAME_LEN = 256, MAX_OPT_VAL_LEN = 256 };
 
+/*
+ * @brief Toggle panics in cfg_get().
+ */
+static int cfg_panic;
+
+/*
+ * @brief Enables panics in cfg_get().
+ */
+void
+cfg_enable_panic(void)
+{
+	cfg_panic = 1;
+}
+
+/*
+ * @brief Disables panics in cfg_get().
+ */
+void
+cfg_disable_panic(void)
+{
+	cfg_panic = 0;
+}
+
 static void
 cfg_get(const char *param)
 {
+	/* int panic = 1; */
+	/* va_list args; */
+	/* va_start(args, param); */
+	/* panic = va_arg(args, int); */
+	/* printf("cfg_get background %d\n", panic); */
+	/* va_end(args); */
+
 	const char *buf =
 		tt_snprintf(MAX_OPT_NAME_LEN, "return box.cfg.%s", param);
-	if (luaL_dostring(tarantool_L, buf) != 0)
+	if ((luaL_dostring(tarantool_L, buf) != 0) && cfg_panic)
 		panic("cfg_get('%s')", param);
 }
 
@@ -76,6 +106,14 @@ cfg_isnumber(const char *param)
 	return ret;
 }
 
+/*
+ * @brief Returns a value of a boolean parameter whose name is passed.
+ *
+ * @param param - name of a boolean parameter
+ * @return -1 - undefined
+ *          1 - false or nil
+ *          0 - true
+ */
 int
 cfg_getb(const char *param)
 {

src/cfg.h

@@ -39,6 +39,18 @@ struct uri_set;
 extern "C" {
 #endif /* defined(__cplusplus) */
 
+/*
+ * @brief Enables panics in cfg_get().
+ */
+void
+cfg_enable_panic(void);
+
+/*
+ * @brief Disables panics in cfg_get().
+ */
+void
+cfg_disable_panic(void);
+
 /**
  * Fill @a uri_set according to cfg @a param.
  * Return 0 if success, otherwise return -1