--- a/plugins/mod_http_files.lua	Mon Jul 11 11:52:43 2016 +0200
+++ b/plugins/mod_http_files.lua	Mon Jul 11 12:17:59 2016 +0200
@@ -17,6 +17,7 @@
 local path_sep = package.config:sub(1,1);
 
 local base_path = module:get_option_string("http_files_dir", module:get_option_string("http_path"));
+local cache_size = module:get_option_number("http_files_cache_size", 128);
 local dir_indices = module:get_option("http_index_files", { "index.html", "index.htm" });
 local directory_index = module:get_option_boolean("http_dir_listing");
 
@@ -81,7 +82,7 @@
 	return "/"..table.concat(out, "/");
 end
 
-local cache = setmetatable({}, { __mode = "kv" }); -- Let the garbage collector have it if it wants to.
+local cache = require "util.cache".new(cache_size);
 
 function serve(opts)
 	if type(opts) ~= "table" then -- assume path string
@@ -119,7 +120,7 @@
 			return 304;
 		end
 
-		local data = cache[orig_path];
+		local data = cache:get(orig_path);
 		if data and data.etag == etag then
 			response_headers.content_type = data.content_type;
 			data = data.data;
@@ -157,7 +158,7 @@
 			end
 			local ext = full_path:match("%.([^./]+)$");
 			local content_type = ext and mime_map[ext];
-			cache[orig_path] = { data = data; content_type = content_type; etag = etag };
+			cache:set(orig_path, { data = data; content_type = content_type; etag = etag });
 			response_headers.content_type = content_type;
 		end