From 980741843520a4dbe9a733ff09a47ec2dfa75bc2 Mon Sep 17 00:00:00 2001
From: Daan Vanden Bosch <daan.v.d.bosch@gmail.com>
Date: Thu, 2 Dec 2021 17:25:18 +0100
Subject: [PATCH] Improved Karma config. The middleware now caches files in
 memory and sends the correct content-type header for json files.

---
 .../resources/world/phantasmal/karmaConfig.js | 43 ++++++++++++++-----
 1 file changed, 33 insertions(+), 10 deletions(-)

diff --git a/buildSrc/src/main/resources/world/phantasmal/karmaConfig.js b/buildSrc/src/main/resources/world/phantasmal/karmaConfig.js
index d274f41c..61e2ce6b 100644
--- a/buildSrc/src/main/resources/world/phantasmal/karmaConfig.js
+++ b/buildSrc/src/main/resources/world/phantasmal/karmaConfig.js
@@ -1,19 +1,39 @@
-config.middleware = config.middleware || [];
-config.middleware.push('resource-loader');
-
 function ResourceLoaderMiddleware() {
-    const fs = require('fs');
+    const fs = require('fs/promises');
+    const cache = new Map;
+
+    return async function (request, response, next) {
+        const path = decodeURI(request.originalUrl);
+        const isJson = path.slice(-5) === '.json';
+
+        function sendContent(content) {
+            if (isJson) {
+                response.setHeader('Content-Type', 'application/json');
+            }
 
-    return function (request, response, next) {
-        try {
-            const content = fs.readFileSync(PROJECT_PATH + '/build/processedResources/js/test' + decodeURI(request.originalUrl));
             response.writeHead(200);
+
             response.end(content);
+        }
+
+        async function tryBasePath(basePath) {
+            const content = await fs.readFile(PROJECT_PATH + basePath + path)
+            cache.set(path, content);
+            sendContent(content);
+        }
+
+        const cached = cache.get(path);
+
+        if (cached) {
+            sendContent(cached);
+            return;
+        }
+
+        try {
+            await tryBasePath('/build/processedResources/js/test');
         } catch (ignored) {
             try {
-                const content = fs.readFileSync(PROJECT_PATH + '/build/processedResources/js/main' + decodeURI(request.originalUrl));
-                response.writeHead(200);
-                response.end(content);
+                await tryBasePath('/build/processedResources/js/main');
             } catch (ignored) {
                 next();
             }
@@ -24,3 +44,6 @@ function ResourceLoaderMiddleware() {
 config.plugins.push({
     'middleware:resource-loader': ['factory', ResourceLoaderMiddleware]
 });
+
+config.middleware = config.middleware || [];
+config.middleware.push('resource-loader');