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// Copyright 2015-2017 Parity Technologies (UK) Ltd. // This file is part of Parity. // Parity is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // Parity is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with Parity. If not, see <http://www.gnu.org/licenses/>. //! This migration compresses the state db. use util::migration::{SimpleMigration, Progress}; use rlp::{Compressible, UntrustedRlp, View, RlpType}; /// Compressing migration. #[derive(Default)] pub struct V8(Progress); impl SimpleMigration for V8 { fn version(&self) -> u32 { 8 } fn columns(&self) -> Option<u32> { None } fn simple_migrate(&mut self, key: Vec<u8>, value: Vec<u8>) -> Option<(Vec<u8>, Vec<u8>)> { self.0.tick(); Some((key,UntrustedRlp::new(&value).compress(RlpType::Blocks).to_vec())) } }