1  use apibara_core::node::v1alpha2::Cursor as ProtoCursor;
 2  
 3  /// A cursor is a position in a stream.
 4  pub trait Cursor: Sized + Default + Clone + std::fmt::Debug {
 5      /// Create a new cursor from a proto cursor.
 6      fn from_proto(cursor: &ProtoCursor) -> Option<Self>;
 7  
 8      /// Returns the proto cursor.
 9      fn to_proto(&self) -> ProtoCursor;
10  }