cache session middlewares

src/core/session.js

@@ -10,22 +10,27 @@ import { HOUR, COOKIE_SESSION_NAME } from './constants';
 import { SESSION_SECRET } from './config';
 
 
-export const store = new RedisStore({ client });
+const middlewareStore = {};
 
 export default (req, res, next) => {
   const domain = getHostFromRequest(req, false, true);
-  const sess = session({
-    name: COOKIE_SESSION_NAME,
-    store,
-    secret: SESSION_SECRET,
-    resave: false,
-    saveUninitialized: false,
-    cookie: {
-      domain,
-      httpOnly: true,
-      secure: false,
-      maxAge: 30 * 24 * HOUR,
-    },
-  });
+  let sess = middlewareStore[domain];
+  if (!sess) {
+    const store = new RedisStore({ client });
+    sess = session({
+      name: COOKIE_SESSION_NAME,
+      store,
+      secret: SESSION_SECRET,
+      resave: false,
+      saveUninitialized: false,
+      cookie: {
+        domain,
+        httpOnly: true,
+        secure: false,
+        maxAge: 30 * 24 * HOUR,
+      },
+    });
+    middlewareStore[domain] = sess;
+  }
   return sess(req, res, next);
 };