introducing router matching cache

Author: jkyberneees

lib/router/sequential.js

@@ -10,6 +10,8 @@ const STATUS_500 = {
 }
 
 module.exports = (config = {}) => {
+  const cache = new Map()
+
   if (!config.defaultRoute) {
     config.defaultRoute = () => {
       return new Response(null, STATUS_404)
@@ -45,8 +47,16 @@ module.exports = (config = {}) => {
     req.path = path || '/'
     req.query = queryIndex > 0 ? qs.parse(url.substring(queryIndex + 1)) : {}
 
-    const match = router.find(req.method, req.path)
-    if (match.handlers.length > 0) {
+    const cacheKey = `${req.method}:${req.path}`
+    let match = null
+    if (cache.has(cacheKey)) {
+      match = cache.get(cacheKey)
+    } else {
+      match = router.find(req.method, req.path)
+      cache.set(cacheKey, match)
+    }
+
+    if (match?.handlers?.length > 0) {
       if (!req.params) {
         req.params = {}
       }