Enha: db use same connection to avoid db locking

repos/main.go

@@ -2,6 +2,7 @@ package repos
 
 import (
 	"context"
+	"gralias/config"
 	"log/slog"
 	"os"
 	"sync"
@@ -20,6 +21,7 @@ type AllRepos interface {
 	SettingsRepo
 	CardMarksRepo
 	InitTx(ctx context.Context) (context.Context, *sqlx.Tx, error)
+	Close()
 }
 
 type RepoProvider struct {
@@ -28,16 +30,31 @@ type RepoProvider struct {
 	pathToDB string
 }
 
+var RP AllRepos
+
+func init() {
+	cfg := config.LoadConfigOrDefault("")
+	// sqlite3 has lock on write, so we need to have only one connection per whole app
+	// https://github.com/mattn/go-sqlite3/issues/274#issuecomment-232942571
+	RP = NewRepoProvider(cfg.DBPath)
+}
+
 func NewRepoProvider(pathToDB string) *RepoProvider {
 	db, err := sqlx.Connect("sqlite3", pathToDB)
 	if err != nil {
 		slog.Error("Unable to connect to database", "error", err)
 		os.Exit(1)
 	}
-	_, err = db.Exec("PRAGMA foreign_keys = ON;")
-	if err != nil {
-		slog.Error("Unable to enable foreign keys", "error", err)
-		os.Exit(1)
+	stmts := []string{
+		"PRAGMA foreign_keys = ON;",
+		"PRAGMA busy_timeout=200;",
+	}
+	for _, stmt := range stmts {
+		_, err = db.Exec(stmt)
+		if err != nil {
+			slog.Error("Unable to enable foreign keys", "error", err)
+			os.Exit(1)
+		}
 	}
 	slog.Info("Successfully connected to database")
 	// db.SetMaxOpenConns(2)
@@ -45,9 +62,7 @@ func NewRepoProvider(pathToDB string) *RepoProvider {
 		DB:       db,
 		pathToDB: pathToDB,
 	}
-
 	go rp.pingLoop()
-
 	return rp
 }