add storage interface, fix all references

src/storage/storage.go

@@ -0,0 +1,36 @@
+package storage
+
+import (
+	"github.com/nkanaev/yarr/src/storage/model"
+	"github.com/nkanaev/yarr/src/storage/sqlite"
+)
+
+type Storage interface {
+	Close() error
+	CountItems() int
+	CreateFeed(params model.CreateFeedParams) *model.Feed
+	CreateFolder(title string) *model.Folder
+	CreateItems(items []model.Item) bool
+	DeleteFeed(feedId int64) bool
+	DeleteFolder(folderId int64) bool
+	DeleteOldItems()
+	FeedStats() []model.FeedStat
+	GetFeed(id int64) *model.Feed
+	GetFeedState(feedID int64) (*model.FeedState, error)
+	GetItem(id int64) *model.Item
+	GetSettings() model.Settings
+	ListFeedStates() ([]model.FeedState, error)
+	ListFeeds() []model.Feed
+	ListFolders() []model.Folder
+	ListItems(filter model.ItemFilter, limit int, newestFirst bool, withContent bool) []model.Item
+	MarkItemsRead(filter model.MarkFilter) bool
+	UpdateFeed(feedId int64, params model.UpdateFeedParams) (bool, error)
+	UpdateFeedState(feedID int64, params model.UpdateFeedStateParams) (bool, error)
+	UpdateFolder(folderId int64, params model.UpdateFolderParams) (bool, error)
+	UpdateItemStatus(item_id int64, status model.ItemStatus) bool
+	UpdateSettings(params model.UpdateSettingsParams) bool
+}
+
+func New(path string) (Storage, error) {
+	return sqlite.New(path)
+}