ddd

server/http-router.js

@@ -0,0 +1,23 @@
+'use strict';
+
+function routeKey(method,pathname){return `${String(method||'GET').toUpperCase()} ${pathname}`}
+
+function createHttpRouter({notFound}={}){
+  const routes=new Map();
+  const add=(method,pathname,handler)=>{
+    if(typeof handler!=='function')throw new TypeError('Route handler must be a function');
+    const key=routeKey(method,pathname);
+    if(routes.has(key))throw new Error(`Duplicate route: ${key}`);
+    routes.set(key,handler);return api;
+  };
+  const dispatch=async(req,res,url)=>{
+    const handler=routes.get(routeKey(req.method,url.pathname));
+    if(handler)return handler(req,res,url);
+    if(typeof notFound==='function')return notFound(req,res,url);
+    return false;
+  };
+  const api=Object.freeze({add,dispatch,has:(method,pathname)=>routes.has(routeKey(method,pathname)),routes:()=>Object.freeze([...routes.keys()])});
+  return api;
+}
+
+module.exports=Object.freeze({routeKey,createHttpRouter});