120 lines
3.0 KiB
Rust
120 lines
3.0 KiB
Rust
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// Copyright 2015, 2016 Ethcore (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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//! Block RLP compression.
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use block::Block;
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use header::Header;
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use views::BlockView;
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use util::rlp::{Rlp, RlpStream, Stream, View};
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use util::{Bytes, H256};
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const HEADER_FIELDS: usize = 11;
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const BLOCK_FIELDS: usize = 2;
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pub struct AbridgedBlock {
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rlp: Bytes,
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}
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impl AbridgedBlock {
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/// Create from a vector of bytes. Does no verification.
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pub fn from_raw(rlp: Bytes) -> Self {
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AbridgedBlock {
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rlp: rlp,
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}
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}
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/// Return the inner bytes.
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pub fn into_inner(self) -> Bytes {
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self.rlp
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}
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/// Given a full block view, trim out the parent hash and block number,
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/// producing new rlp.
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pub fn from_block_view(block_view: &BlockView) -> Self {
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let header = block_view.header_view();
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let seal_fields = header.seal();
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// 11 header fields, unknown amount of seal fields, and 2 block fields.
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let mut stream = RlpStream::new_list(
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HEADER_FIELDS +
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seal_fields.len() +
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BLOCK_FIELDS
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);
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// write header values.
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stream
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.append(&header.uncles_hash())
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.append(&header.author())
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.append(&header.state_root())
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.append(&header.transactions_root())
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.append(&header.receipts_root())
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.append(&header.log_bloom())
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.append(&header.difficulty())
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.append(&header.gas_limit())
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.append(&header.gas_used())
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.append(&header.timestamp())
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.append(&header.extra_data());
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// write seal fields.
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for field in seal_fields {
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stream.append_raw(&field, 1);
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}
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// write block values.
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stream.append(&block_view.transactions()).append(&block_view.uncles());
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AbridgedBlock {
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rlp: stream.out(),
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}
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}
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/// Flesh out an abridged block view with the provided parent hash and block number.
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///
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/// Will fail if contains invalid rlp.
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pub fn to_block(&self, parent_hash: H256, number: u64) -> Block {
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let rlp = Rlp::new(&self.rlp);
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let mut header = Header {
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parent_hash: parent_hash,
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uncles_hash: rlp.val_at(0),
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author: rlp.val_at(1),
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state_root: rlp.val_at(2),
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transactions_root: rlp.val_at(3),
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receipts_root: rlp.val_at(4),
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log_bloom: rlp.val_at(5),
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difficulty: rlp.val_at(6),
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number: number,
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gas_limit: rlp.val_at(7),
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gas_used: rlp.val_at(8),
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timestamp: rlp.val_at(9),
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extra_data: rlp.val_at(10),
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..Default::default()
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};
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let seal: Vec<Bytes> = rlp.val_at(11);
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header.set_seal(seal);
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Block {
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header: header,
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transactions: rlp.val_at(12),
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uncles: rlp.val_at(13),
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}
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}
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}
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