Setup ServeHTTP on router.

router.go

@@ -154,7 +154,16 @@ func (r *Router) Get(path string, callback http.HandlerFunc) {
 	r.AddRoute(http.MethodGet, path, callback)
 }
 
+// ServeHTTP is the function that is required by http.Handler. It takes an http.ResponseWriter which
+// it uses to write to a response object that will construct a response for the user. It also takes
+// an *http.Request which describes the request the user has made.
+//
+// In the case of this router, all it needs to do is lookup the Handler that has been saved at a given
+// path and then call its ServeHTTP.
 func (r Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	handler, _ := r.Handler(req)
+	handler.ServeHTTP(w, req)
+
 	return
 }
 

router_test.go

@@ -45,7 +45,7 @@ func TestAddRouter(t *testing.T) {
 	// checkLookup(router.lookup)
 }
 
-func TestHandler(t *testing.T) {
+func TestServeHTTP(t *testing.T) {
 	router := Router{}
 	path := "/items"
 	expectedBody := "I am /items"
@@ -61,17 +61,6 @@ func TestHandler(t *testing.T) {
 	if err != nil {
 		t.Error("Did not find the expected callback handler", err)
 	}
-
-	checkLookup(router.lookup)
-
-}
-
-func checkLookup(curr *segment) {
-	fmt.Printf("%p { path: %s, methods: %v, children: %v}\n", curr, curr.path, curr.methods, curr.children)
-
-	for _, v := range curr.children {
-		checkLookup(v)
-	}
 }
 
 func matchAndCheckRoute(r *Router, method string, path string, expectedBody string, expectedCode int) (err error) {
@@ -84,15 +73,7 @@ func matchAndCheckRoute(r *Router, method string, path string, expectedBody stri
 		return
 	}
 
-	h, pattern := r.Handler(request)
-
-	if pattern != "/items" {
-		err = fmt.Errorf("The recovered patter does not match: %s", pattern)
-
-		return
-	}
-
-	h.ServeHTTP(rr, request)
+	r.ServeHTTP(rr, request)
 
 	if rr.Code != expectedCode {
 		err = fmt.Errorf("The returned callback did not write 200 to the header. Found %d", rr.Code)
@@ -154,3 +135,12 @@ func addAndCheckRoute(r *Router, method string, path string, callback http.Handl
 
 	return
 }
+
+// checkLookup prints out the various saved routes. It's not needed for any test, but is a helpful debugging tool.
+func checkLookup(curr *segment) {
+	fmt.Printf("%p { path: %s, methods: %v, children: %v}\n", curr, curr.path, curr.methods, curr.children)
+
+	for _, v := range curr.children {
+		checkLookup(v)
+	}
+}