refactor(route cache): clean and improve, add route -> name conversion and use Storer to persist route cache

internal/route_cache.go

@@ -1,10 +1,17 @@
 package internal
 
 import (
+	"context"
+	"fmt"
 	"log"
+	"net/http"
+	"regexp"
+	"strings"
 	"sync"
+	"time"
 
-	"git.markbailey.dev/cerbervs/joist/internal/errors"
+	ee "git.markbailey.dev/cerbervs/joist/internal/errors"
+	"github.com/go-chi/chi/v5"
 )
 
 const suff = "route_cache"
@@ -16,6 +23,7 @@ type RouteCacher interface {
 }
 
 type routeCache struct {
+	rx chi.Router
 	rs map[string]string
 	s  Storer
 }
@@ -26,7 +34,7 @@ var (
 	c      *routeCache
 )
 
-func NewRouteCache(store Storer) (*routeCache, error) {
+func NewRouteCache(store Storer, router chi.Router) (*routeCache, error) {
 	rcOnce.Do(func() {
 		if store == nil {
 			st, err := NewBadgerStore(WithSubDir("route_cache"))
@@ -39,13 +47,14 @@ func NewRouteCache(store Storer) (*routeCache, error) {
 		}
 
 		c = &routeCache{
+			rx: router,
 			rs: make(map[string]string),
 			s:  store,
 		}
 	})
 
 	if c == nil {
-		return nil, errors.ErrCacheUninitialized
+		return nil, ee.ErrCacheUninitialized
 	}
 
 	rcLock.Lock()
@@ -56,7 +65,7 @@ func NewRouteCache(store Storer) (*routeCache, error) {
 
 func (r *routeCache) All() (map[string]string, error) {
 	if r.rs == nil {
-		return nil, errors.ErrCacheUninitialized
+		return nil, ee.ErrCacheUninitialized
 	}
 	return r.rs, nil
 }
@@ -70,5 +79,57 @@ func (r *routeCache) GetPath(name string) (string, error) {
 		return path, nil
 	}
 
-	return string(""), errors.NewErrRouteNotFound(string(name))
+	return string(""), ee.NewErrRouteNotFound(string(name))
+}
+
+func (r *routeCache) UnmarshallFromStore() error {
+	if err := chi.Walk(r.rx, walker(r.s)); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func walker(store Storer) chi.WalkFunc {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	return func(method string, route string, handler http.Handler, middlewares ...func(http.Handler) http.Handler) error {
+		routeName, err := convertRouteToRouteName(route)
+		if err != nil {
+			return fmt.Errorf(`failed to name route "%s"`, route)
+		}
+
+		if routeName[len(routeName)-2:] != ".*" {
+			route = regexp.MustCompile(`:.*}`).ReplaceAllString(route, "}")
+			if len(route) > 1 {
+				route = strings.TrimRight(route, "/")
+			}
+			store.Put(ctx, routeName, []byte(route), 1*time.Hour)
+		}
+
+		return nil
+	}
+}
+
+func convertRouteToRouteName(route string) (string, error) {
+	name := "app"
+	if route == "/" {
+		return name + ".home", nil
+	}
+
+	route = strings.ReplaceAll(route, "/", ".")
+	route = strings.ReplaceAll(route, "-", "_")
+
+	paramRegex := regexp.MustCompile(`\.{[^}]*}`)
+	params := paramRegex.FindAllString(route, -1)
+	route = paramRegex.ReplaceAllString(route, "")
+
+	if len(params) > 0 {
+		route += ".params"
+	}
+
+	name += strings.TrimRight(route, ".")
+
+	return name, nil
 }