Works now, Mutex whatever

database.go

@@ -3,6 +3,7 @@ package main
 import (
 	"database/sql"
 	_ "embed"
+	"sync"
 
 	_ "github.com/mattn/go-sqlite3"
 )
@@ -28,16 +29,18 @@ type Chapter struct {
 type DatabaseManager struct {
 	ConnectionString string
 	db               *sql.DB
-	Mangas           map[int]*Manga
+
-	Chapters         map[int]*Chapter
+	rw       *sync.Mutex
+	Mangas   map[int]*Manga
+	Chapters map[int]*Chapter
 
 	CreateIfNotExists bool
 }
 
 func NewDatabase(connectionString string, createIfNotExists bool) DatabaseManager {
 	return DatabaseManager{
-		ConnectionString: connectionString,
+		ConnectionString:  connectionString,
-
+		rw:                &sync.Mutex{},
 		Mangas:            make(map[int]*Manga),
 		Chapters:          make(map[int]*Chapter),
 		CreateIfNotExists: createIfNotExists,
@@ -75,6 +78,8 @@ func (dbMgr *DatabaseManager) Close() error {
 func (dbMgr *DatabaseManager) Save() error {
 	db := dbMgr.db
 
+	dbMgr.rw.Lock()
+	defer dbMgr.rw.Unlock()
 	for _, m := range dbMgr.Mangas {
 		count := 0
 		err := db.QueryRow("SELECT COUNT(*) FROM Manga where ID = ?", m.Id).Scan(&count)
@@ -128,6 +133,10 @@ func (dbMgr *DatabaseManager) createDatabaseIfNotExists() error {
 
 func (dbMgr *DatabaseManager) load() error {
 	db := dbMgr.db
+
+	dbMgr.rw.Lock()
+	defer dbMgr.rw.Unlock()
+
 	rows, err := db.Query("SELECT * FROM Manga")
 	if err != nil {
 		return err

main.go

@@ -37,19 +37,6 @@ func main() {
 		return
 	}
 
-	//var latestTimeStamp int64 = 0
-	//var latestUrl string
-	//for _, m := range db.Mangas {
-	//	if latestTimeStamp < m.LatestChapter.TimeStampUnix {
-	//		latestTimeStamp = m.LatestChapter.TimeStampUnix
-	//		latestUrl = m.LatestChapter.Url
-	//	}
-	//}
-	//
-	//if latestUrl == "" {
-	//	latestUrl = "/title/80381-i-stan-the-prince/1539086-ch_16"
-	//}
-
 	server := Server{
 		ImageBuffers: make(map[string]*bytes.Buffer),
 		NextReady:    make(chan bool),
@@ -68,10 +55,6 @@ func main() {
 		}
 	}()
 
-	//server.LoadCurr()
-	//go server.LoadPrev()
-	//go server.LoadNext()
-
 	http.HandleFunc("/", server.HandleMenu)
 	http.HandleFunc("/new/title/{title}/{chapter}", server.HandleNew)
 	http.HandleFunc("/current/", server.HandleCurrent)

server.go

@@ -188,7 +188,10 @@ func (s *Server) HandlePrev(w http.ResponseWriter, r *http.Request) {
 }
 
 func (s *Server) HandleCurrent(w http.ResponseWriter, _ *http.Request) {
-	tmpl := template.Must(template.ParseFiles("test.gohtml"))
+	tmpl := template.Must(template.ParseFiles("viewer.gohtml"))
+
+	s.DbMgr.rw.Lock()
+	defer s.DbMgr.rw.Unlock()
 
 	mangaId, chapterId, err := getMangaIdAndChapterId(s.CurrSubUrl)
 	if err != nil {
@@ -311,6 +314,9 @@ func (s *Server) AppendImagesToBuf(html string) ([]Image, error) {
 func (s *Server) HandleMenu(w http.ResponseWriter, r *http.Request) {
 	tmpl := template.Must(template.ParseFiles("menu.gohtml"))
 
+	s.DbMgr.rw.Lock()
+	defer s.DbMgr.rw.Unlock()
+
 	all := s.DbMgr.Mangas
 	l := len(all)
 	mangaViewModels := make([]MangaViewModel, l)