79 lines
2.6 KiB
Rust
79 lines
2.6 KiB
Rust
// Copyright 2015-2020 Parity Technologies (UK) Ltd.
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// This file is part of OpenEthereum.
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// OpenEthereum 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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// OpenEthereum 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 OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
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//! Snapshot manifest type definition
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use crate::bytes::Bytes;
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use ethereum_types::H256;
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use rlp::{DecoderError, Rlp, RlpStream};
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/// Manifest data.
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub struct ManifestData {
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/// Snapshot format version.
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pub version: u64,
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/// List of state chunk hashes.
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pub state_hashes: Vec<H256>,
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/// List of block chunk hashes.
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pub block_hashes: Vec<H256>,
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/// The final, expected state root.
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pub state_root: H256,
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/// Block number this snapshot was taken at.
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pub block_number: u64,
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/// Block hash this snapshot was taken at.
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pub block_hash: H256,
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}
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impl ManifestData {
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/// Encode the manifest data to rlp.
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pub fn into_rlp(self) -> Bytes {
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let mut stream = RlpStream::new_list(6);
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stream.append(&self.version);
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stream.append_list(&self.state_hashes);
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stream.append_list(&self.block_hashes);
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stream.append(&self.state_root);
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stream.append(&self.block_number);
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stream.append(&self.block_hash);
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stream.out()
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}
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/// Try to restore manifest data from raw bytes, interpreted as RLP.
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pub fn from_rlp(raw: &[u8]) -> Result<Self, DecoderError> {
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let decoder = Rlp::new(raw);
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let (start, version) = if decoder.item_count()? == 5 {
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(0, 1)
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} else {
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(1, decoder.val_at(0)?)
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};
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let state_hashes: Vec<H256> = decoder.list_at(start + 0)?;
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let block_hashes: Vec<H256> = decoder.list_at(start + 1)?;
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let state_root: H256 = decoder.val_at(start + 2)?;
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let block_number: u64 = decoder.val_at(start + 3)?;
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let block_hash: H256 = decoder.val_at(start + 4)?;
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Ok(ManifestData {
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version: version,
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state_hashes: state_hashes,
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block_hashes: block_hashes,
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state_root: state_root,
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block_number: block_number,
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block_hash: block_hash,
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})
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}
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}
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