From b032cd71e66174ccc006524b362b340667267462 Mon Sep 17 00:00:00 2001
From: Elena Grahovac <elena.grahovac@ferretdb.io>
Date: Fri, 8 Sep 2023 08:00:57 +0200
Subject: [PATCH] Implement `listDatabases` for SQLite (#3269)

Closes #3260.
---
 integration/commands_administration_test.go |  5 ++---
 internal/backends/sqlite/backend.go         | 23 +++++++++++++++++++--
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/integration/commands_administration_test.go b/integration/commands_administration_test.go
index e51aaf6604bc..8d7530e23fae 100644
--- a/integration/commands_administration_test.go
+++ b/integration/commands_administration_test.go
@@ -139,10 +139,9 @@ func TestCommandsAdministrationCreateDropListDatabases(t *testing.T) {
 	assert.Equal(t, bson.D{{"ok", 1.0}}, res)
 }
 
-func TestCommandsAdministrationListDatabases(tt *testing.T) {
-	tt.Parallel()
+func TestCommandsAdministrationListDatabases(t *testing.T) {
+	t.Parallel()
 
-	t := setup.FailsForSQLite(tt, "https://github.com/FerretDB/FerretDB/issues/3260")
 	ctx, collection := setup.Setup(t, shareddata.DocumentsStrings)
 
 	db := collection.Database()
diff --git a/internal/backends/sqlite/backend.go b/internal/backends/sqlite/backend.go
index 2609e0e14fb4..12634ee17bb0 100644
--- a/internal/backends/sqlite/backend.go
+++ b/internal/backends/sqlite/backend.go
@@ -98,8 +98,27 @@ func (b *backend) ListDatabases(ctx context.Context, params *backends.ListDataba
 	res := &backends.ListDatabasesResult{
 		Databases: make([]backends.DatabaseInfo, len(list)),
 	}
-	for i, db := range list {
-		res.Databases[i] = backends.DatabaseInfo{Name: db}
+
+	for i, dbName := range list {
+		db, err := b.Database(dbName)
+		if err != nil {
+			return nil, lazyerrors.Error(err)
+		}
+
+		stats, err := db.Stats(ctx, new(backends.DatabaseStatsParams))
+		if backends.ErrorCodeIs(err, backends.ErrorCodeDatabaseDoesNotExist) {
+			stats = new(backends.DatabaseStatsResult)
+			err = nil
+		}
+
+		if err != nil {
+			return nil, lazyerrors.Error(err)
+		}
+
+		res.Databases[i] = backends.DatabaseInfo{
+			Name: dbName,
+			Size: stats.SizeTotal,
+		}
 	}
 
 	return res, nil