🌵hybrid routing with tree and fast router

app.go

@@ -634,6 +634,7 @@ func (app *App) init() *App {
 	app.server.IdleTimeout = app.Settings.IdleTimeout
 	app.server.ReadBufferSize = app.Settings.ReadBufferSize
 	app.server.WriteBufferSize = app.Settings.WriteBufferSize
+	app.buildTree()
 	app.mutex.Unlock()
 	return app
 }

ctx.go

@@ -38,7 +38,7 @@ type Ctx struct {
 	method       string               // HTTP method
 	methodINT    int                  // HTTP method INT equivalent
 	path         string               // Prettified HTTP path
-	treePart     string               //
+	treePath     string               // Path for the search in the tree
 	pathOriginal string               // Original HTTP path
 	values       []string             // Route parameter values
 	err          error                // Contains error if passed to Next
@@ -1038,8 +1038,8 @@ func (ctx *Ctx) prettifyPath() {
 		ctx.path = utils.TrimRight(ctx.path, '/')
 	}
 
-	ctx.treePart = ctx.treePart[0:0]
+	ctx.treePath = ctx.treePath[0:0]
 	if len(ctx.path) >= 3 {
-		ctx.treePart = ctx.path[:3]
+		ctx.treePath = ctx.path[:3]
 	}
 }

router.go

@@ -86,7 +86,7 @@ func (r *Route) match(path, original string) (match bool, values []string) {
 
 func (app *App) next(ctx *Ctx) bool {
 	// Get stack length
-	tree, ok := app.treeStack[ctx.methodINT][ctx.treePart]
+	tree, ok := app.treeStack[ctx.methodINT][ctx.treePath]
 	if !ok {
 		tree = app.treeStack[ctx.methodINT][""]
 	}
@@ -338,21 +338,11 @@ func (app *App) registerStatic(prefix, root string, config ...Static) Route {
 func (app *App) addRoute(method string, route *Route) {
 	// Get unique HTTP method indentifier
 	m := methodInt(method)
-	// TODO: improve code
-	if app.treeStack[m] == nil {
-		app.treeStack[m] = make(map[string][]*Route)
-	}
-
-	treePart := ""
-	if len(route.routeParser.segs) > 0 && len(route.routeParser.segs[0].Const) >= 2 {
-		// TODO: change it for the new route logic
-		treePart = "/" + route.routeParser.segs[0].Const[:2]
-	}
 
 	// prevent identically route registration
-	l := len(app.treeStack[m][treePart])
-	if l > 0 && app.treeStack[m][treePart][l-1].Path == route.Path && route.use == app.treeStack[m][treePart][l-1].use {
-		preRoute := app.treeStack[m][treePart][l-1]
+	l := len(app.stack[m])
+	if l > 0 && app.stack[m][l-1].Path == route.Path && route.use == app.stack[m][l-1].use {
+		preRoute := app.stack[m][l-1]
 		preRoute.Handlers = append(preRoute.Handlers, route.Handlers...)
 	} else {
 		// Increment global route position
@@ -363,43 +353,36 @@ func (app *App) addRoute(method string, route *Route) {
 		route.Method = method
 		// Add route to the stack
 		app.stack[m] = append(app.stack[m], route)
+	}
+}
 
-		// TODO: outsource code
-		app.treeStack[m][treePart] = append(app.treeStack[m][treePart], route)
-
+// uniqueRouteStack
+func (app *App) buildTree() *App {
+	// loop all the methods and stacks and create the prefix tree
+	for m := range intMethod {
+		app.treeStack[m] = make(map[string][]*Route)
+		for _, route := range app.stack[m] {
+			treePath := ""
+			if len(route.routeParser.segs) > 0 && len(route.routeParser.segs[0].Const) >= 3 {
+				treePath = route.routeParser.segs[0].Const[:3]
+			}
+			// create tree stack
+			app.treeStack[m][treePath] = append(app.treeStack[m][treePath], route)
+		}
+	}
+	// loop the methods and tree stacks and add global stack and sort everything
+	for m := range intMethod {
+		for treePart := range app.treeStack[m] {
 			if treePart != "" {
+				// merge global tree routes in current tree stack
 				app.treeStack[m][treePart] = uniqueRouteStack(append(app.treeStack[m][treePart], app.treeStack[m][""]...))
-		} else {
-			for k, v := range app.treeStack[m] {
-				if k != treePart {
-					app.treeStack[m][k] = uniqueRouteStack(append(v, app.treeStack[m][""]...))
-					sort.Slice(app.treeStack[m][k], func(i, j int) bool {
-						return app.treeStack[m][k][i].pos < app.treeStack[m][k][j].pos
-					})
-				}
-			}
 			}
+			// sort tree slices with the positions
 			sort.Slice(app.treeStack[m][treePart], func(i, j int) bool {
 				return app.treeStack[m][treePart][i].pos < app.treeStack[m][treePart][j].pos
 			})
 		}
-}
-
-func uniqueRouteStack(stack []*Route) []*Route {
-	var unique []*Route
-	m := make(map[*Route]int)
-	for _, v := range stack {
-		if i, ok := m[v]; ok {
-			// Overwrite previous value per requirement in
-			// question to keep last matching value.
-			unique[i] = v
-		} else {
-			// Unique key found. Record position and collect
-			// in result.
-			m[v] = len(unique)
-			unique = append(unique, v)
-		}
 	}
 
-	return unique
+	return app
 }

router_test.go

@@ -234,8 +234,7 @@ func Test_Router_Handler_SetETag(t *testing.T) {
 	})
 
 	c := &fasthttp.RequestCtx{}
-
-	app.handler(c)
+	app.init().handler(c)
 
 	utils.AssertEqual(t, `"13-1831710635"`, string(c.Response.Header.Peek(HeaderETag)))
 }
@@ -375,6 +374,7 @@ func Benchmark_Router_Next(b *testing.B) {
 	request.URI().SetPath("/user/keys/1337")
 	var res bool
 
+	app.init()
 	c := app.AcquireCtx(request)
 	defer app.ReleaseCtx(c)
 
@@ -518,6 +518,7 @@ func Benchmark_Router_Handler_StrictRouting(b *testing.B) {
 func Benchmark_Router_Github_API(b *testing.B) {
 	app := New()
 	registerDummyRoutes(app)
+	app.init()
 
 	c := &fasthttp.RequestCtx{}
 	var match bool

utils.go

@@ -51,7 +51,7 @@ func setMethodNotAllowed(ctx *Ctx) {
 		}
 		// Reset stack index
 		ctx.indexRoute = -1
-		tree, ok := ctx.app.treeStack[i][ctx.treePart]
+		tree, ok := ctx.app.treeStack[i][ctx.treePath]
 		if !ok {
 			tree = ctx.app.treeStack[i][""]
 		}
@@ -294,6 +294,22 @@ var getBytesImmutable = func(s string) (b []byte) {
 	return []byte(s)
 }
 
+// uniqueRouteStack drop all not unique routes from the slice
+func uniqueRouteStack(stack []*Route) []*Route {
+	var unique []*Route
+	m := make(map[*Route]int)
+	for _, v := range stack {
+		if _, ok := m[v]; !ok {
+			// Unique key found. Record position and collect
+			// in result.
+			m[v] = len(unique)
+			unique = append(unique, v)
+		}
+	}
+
+	return unique
+}
+
 // HTTP methods and their unique INTs
 func methodInt(s string) int {
 	switch s {

utils_test.go

@@ -211,6 +211,34 @@ func Test_Utils_TestConn_Deadline(t *testing.T) {
 	utils.AssertEqual(t, nil, conn.SetWriteDeadline(time.Time{}))
 }
 
+func Test_Utils_UniqueRouteStack(t *testing.T) {
+	route1 := &Route{}
+	route2 := &Route{}
+	route3 := &Route{}
+	utils.AssertEqual(
+		t,
+		[]*Route{
+			route1,
+			route2,
+			route3,
+		},
+		uniqueRouteStack([]*Route{
+			route1,
+			route1,
+			route1,
+			route2,
+			route2,
+			route2,
+			route3,
+			route3,
+			route3,
+			route1,
+			route2,
+			route3,
+		}),
+	)
+}
+
 func Test_Utils_IsNoCache(t *testing.T) {
 	testCases := []struct {
 		string