Request time cache, tracking collaborators etc

server/middlewares/cache.js

@@ -0,0 +1,24 @@
+import debug from 'debug';
+
+const debugCache = debug('cache');
+
+export default function cache() {
+  return async function cacheMiddleware(ctx, next) {
+    ctx.cache = {};
+
+    ctx.cache.set = async (id, value) => {
+      ctx.cache[id] = value;
+    }
+
+    ctx.cache.get = async (id, def) => {
+      if (ctx.cache[id]) {
+        debugCache(`hit: ${id}`);
+      } else {
+        debugCache(`miss: ${id}`);
+        ctx.cache.set(id, await def());
+      }
+      return ctx.cache[id];
+    };
+    return next();
+  };
+}