store http state

storage/http.go

@@ -0,0 +1,34 @@
+package storage
+
+type HTTPState struct {
+	LastModified string
+	Etag         string
+}
+
+func (s *Storage) GetHTTPState(url string) *HTTPState {
+	row := s.db.QueryRow(`
+		select last_modified, etag
+		from http_state where url = ?
+	`, url)
+
+	if row == nil {
+		return nil
+	}
+
+	var state HTTPState
+	row.Scan(&state.LastModified, &state.Etag)
+	return &state
+}
+
+func (s *Storage) SetHTTPState(url string, state HTTPState) {
+	_, err := s.db.Exec(`
+		insert into http_state (url, last_modified, etag)
+		values (?, ?, ?)
+		on conflict (url) do update set last_modified = ?, etag = ?`,
+		url, state.LastModified, state.Etag,
+		state.LastModified, state.Etag,
+	)
+	if err != nil {
+		s.log.Print(err)
+	}
+}

storage/storage.go

@@ -61,6 +61,12 @@ create virtual table if not exists search using fts4(title, description, content
 create trigger if not exists del_item_search after delete on items begin
   delete from search where rowid = old.search_rowid;
 end;
+
+create table if not exists http_state (
+ url            string not null primary key,
+ last_modified  string not null,
+ etag           string not null
+);
 `
 
 type Storage struct {