From 59b1a2d5e0fd1b3375ca0bcfc6da53d5f890d3e7 Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Mon, 1 Jun 2020 16:00:47 +0200
Subject: [PATCH] performance: add template cache for quicker page renders

---
 src/node/eejs/index.js | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/node/eejs/index.js b/src/node/eejs/index.js
index 9d032840d..bfb445de2 100644
--- a/src/node/eejs/index.js
+++ b/src/node/eejs/index.js
@@ -25,6 +25,8 @@ var path = require("path");
 var hooks = require("ep_etherpad-lite/static/js/pluginfw/hooks.js");
 var resolve = require("resolve");
 
+const templateCache = new Map()
+
 exports.info = {
   __output_stack: [],
   block_stack: [],
@@ -114,12 +116,19 @@ exports.require = function (name, args, mod) {
 
   args.e = exports;
   args.require = require;
-  var template = '<% e._init(__output); %>' + fs.readFileSync(ejspath).toString() + '<% e._exit(); %>';
-  
+
+  let template
+  if (!templateCache.has(ejspath)) {
+    template = '<% e._init(__output); %>' + fs.readFileSync(ejspath).toString() + '<% e._exit(); %>';
+    templateCache.set(ejspath, template)
+  } else {
+    template = templateCache.get(ejspath)
+  }
+
   exports.info.args.push(args);
   exports.info.file_stack.push({path: ejspath, inherit: []});
 
-  var res = ejs.render(template, args);
+  var res = ejs.render(template, args, { cache: true, filename: ejspath });
   exports.info.file_stack.pop();
   exports.info.args.pop();