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