badger: support temporary in-memory databases

db_badger.go

@@ -12,7 +12,6 @@ import (
 
 type badgerLoadedDatabase struct {
 	displayName string
-	path        string
 	db          *badger.DB
 	nav         *vcl.TTreeNode
 
@@ -117,20 +116,32 @@ var _ loadedDatabase = &badgerLoadedDatabase{} // interface assertion
 
 //
 
+func (f *TMainForm) badgerAddDatabaseFromMemory() {
+	f.badgerAddDatabaseFrom(badger.DefaultOptions("").WithInMemory(true))
+}
+
 func (f *TMainForm) badgerAddDatabaseFromDirectory(path string) {
+	f.badgerAddDatabaseFrom(badger.DefaultOptions(path))
+}
+
+func (f *TMainForm) badgerAddDatabaseFrom(opts badger.Options) {
 	// TODO load in background thread to stop blocking the UI
-	db, err := badger.Open(badger.DefaultOptions(path))
+	db, err := badger.Open(opts)
 	if err != nil {
-		vcl.ShowMessage(fmt.Sprintf("Failed to load database '%s': %s", path, err.Error()))
+		vcl.ShowMessage(fmt.Sprintf("Failed to load database: %s", err.Error()))
 		return
 	}
 
 	ld := &badgerLoadedDatabase{
-		path:        path,
-		displayName: filepath.Base(path),
 		db: db,
 	}
 
+	if opts.Dir == "" {
+		ld.displayName = ":memory:" // SQLite-style naming
+	} else {
+		ld.displayName = filepath.Base(opts.Dir)
+	}
+
 	ld.nav = f.Buckets.Items().Add(nil, ld.displayName)
 	ld.nav.SetHasChildren(true) // dynamically populate in OnNavExpanding
 	ld.nav.SetImageIndex(imgDatabase)

main.go

@@ -57,6 +57,12 @@ func (f *TMainForm) OnFormCreate(sender vcl.IObject) {
 	mnuFileBadgerOpen.SetOnClick(f.OnMnuFileBadgerOpenClick)
 	mnuFileBadger.Add(mnuFileBadgerOpen)
 
+	mnuFileBadgerMemory := vcl.NewMenuItem(mnuFileBadger)
+	mnuFileBadgerMemory.SetCaption("New in-memory database")
+	mnuFileBadgerMemory.SetImageIndex(imgDatabaseAdd)
+	mnuFileBadgerMemory.SetOnClick(f.OnMnuFileBadgerMemoryClick)
+	mnuFileBadger.Add(mnuFileBadgerMemory)
+
 	//
 
 	mnuFileBolt := vcl.NewMenuItem(mnuFile)
@@ -277,6 +283,11 @@ func (f *TMainForm) OnMnuFileBadgerOpenClick(sender vcl.IObject) {
 	}
 }
 
+func (f *TMainForm) OnMnuFileBadgerMemoryClick(sender vcl.IObject) {
+	f.badgerAddDatabaseFromMemory()
+
+}
+
 func (f *TMainForm) OnMnuFileSqliteMemoryClick(sender vcl.IObject) {
 	f.sqliteAddDatabaseFromFile(`:memory:`)
 }