374 lines
14 KiB
Rust
374 lines
14 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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//! Block header.
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use std::cmp;
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use std::cell::RefCell;
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use hash::{KECCAK_NULL_RLP, KECCAK_EMPTY_LIST_RLP, keccak};
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use heapsize::HeapSizeOf;
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use ethereum_types::{H256, U256, Address};
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use bytes::Bytes;
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use basic_types::{LogBloom, ZERO_LOGBLOOM};
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use time::get_time;
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use rlp::*;
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pub use basic_types::Seal;
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pub use types::BlockNumber;
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/// A block header.
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///
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/// Reflects the specific RLP fields of a block in the chain with additional room for the seal
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/// which is non-specific.
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///
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/// Doesn't do all that much on its own.
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#[derive(Debug, Clone, Eq)]
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pub struct Header {
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/// Parent hash.
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parent_hash: H256,
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/// Block timestamp.
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timestamp: u64,
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/// Block number.
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number: BlockNumber,
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/// Block author.
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author: Address,
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/// Transactions root.
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transactions_root: H256,
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/// Block uncles hash.
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uncles_hash: H256,
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/// Block extra data.
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extra_data: Bytes,
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/// State root.
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state_root: H256,
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/// Block receipts root.
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receipts_root: H256,
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/// Block bloom.
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log_bloom: LogBloom,
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/// Gas used for contracts execution.
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gas_used: U256,
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/// Block gas limit.
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gas_limit: U256,
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/// Block difficulty.
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difficulty: U256,
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/// Vector of post-RLP-encoded fields.
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seal: Vec<Bytes>,
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/// The memoized hash of the RLP representation *including* the seal fields.
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hash: RefCell<Option<H256>>,
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/// The memoized hash of the RLP representation *without* the seal fields.
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bare_hash: RefCell<Option<H256>>,
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}
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impl PartialEq for Header {
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fn eq(&self, c: &Header) -> bool {
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self.parent_hash == c.parent_hash &&
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self.timestamp == c.timestamp &&
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self.number == c.number &&
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self.author == c.author &&
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self.transactions_root == c.transactions_root &&
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self.uncles_hash == c.uncles_hash &&
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self.extra_data == c.extra_data &&
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self.state_root == c.state_root &&
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self.receipts_root == c.receipts_root &&
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self.log_bloom == c.log_bloom &&
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self.gas_used == c.gas_used &&
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self.gas_limit == c.gas_limit &&
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self.difficulty == c.difficulty &&
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self.seal == c.seal
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}
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}
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impl Default for Header {
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fn default() -> Self {
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Header {
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parent_hash: H256::default(),
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timestamp: 0,
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number: 0,
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author: Address::default(),
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transactions_root: KECCAK_NULL_RLP,
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uncles_hash: KECCAK_EMPTY_LIST_RLP,
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extra_data: vec![],
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state_root: KECCAK_NULL_RLP,
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receipts_root: KECCAK_NULL_RLP,
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log_bloom: ZERO_LOGBLOOM.clone(),
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gas_used: U256::default(),
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gas_limit: U256::default(),
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difficulty: U256::default(),
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seal: vec![],
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hash: RefCell::new(None),
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bare_hash: RefCell::new(None),
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}
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}
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}
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impl Header {
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/// Create a new, default-valued, header.
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pub fn new() -> Self {
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Self::default()
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}
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/// Get the parent_hash field of the header.
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pub fn parent_hash(&self) -> &H256 { &self.parent_hash }
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/// Get the timestamp field of the header.
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pub fn timestamp(&self) -> u64 { self.timestamp }
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/// Get the number field of the header.
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pub fn number(&self) -> BlockNumber { self.number }
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/// Get the author field of the header.
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pub fn author(&self) -> &Address { &self.author }
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/// Get the extra data field of the header.
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pub fn extra_data(&self) -> &Bytes { &self.extra_data }
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/// Get a mutable reference to extra_data
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pub fn extra_data_mut(&mut self) -> &mut Bytes { self.note_dirty(); &mut self.extra_data }
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/// Get the state root field of the header.
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pub fn state_root(&self) -> &H256 { &self.state_root }
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/// Get the receipts root field of the header.
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pub fn receipts_root(&self) -> &H256 { &self.receipts_root }
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/// Get the log bloom field of the header.
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pub fn log_bloom(&self) -> &LogBloom { &self.log_bloom }
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/// Get the transactions root field of the header.
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pub fn transactions_root(&self) -> &H256 { &self.transactions_root }
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/// Get the uncles hash field of the header.
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pub fn uncles_hash(&self) -> &H256 { &self.uncles_hash }
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/// Get the gas used field of the header.
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pub fn gas_used(&self) -> &U256 { &self.gas_used }
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/// Get the gas limit field of the header.
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pub fn gas_limit(&self) -> &U256 { &self.gas_limit }
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/// Get the difficulty field of the header.
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pub fn difficulty(&self) -> &U256 { &self.difficulty }
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/// Get the seal field of the header.
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pub fn seal(&self) -> &[Bytes] { &self.seal }
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/// Get the seal field with RLP-decoded values as bytes.
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pub fn decode_seal<'a, T: ::std::iter::FromIterator<&'a [u8]>>(&'a self) -> Result<T, DecoderError> {
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self.seal.iter().map(|rlp| {
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UntrustedRlp::new(rlp).data()
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}).collect()
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}
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// TODO: seal_at, set_seal_at &c.
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/// Set the number field of the header.
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pub fn set_parent_hash(&mut self, a: H256) { self.parent_hash = a; self.note_dirty(); }
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/// Set the uncles hash field of the header.
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pub fn set_uncles_hash(&mut self, a: H256) { self.uncles_hash = a; self.note_dirty(); }
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/// Set the state root field of the header.
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pub fn set_state_root(&mut self, a: H256) { self.state_root = a; self.note_dirty(); }
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/// Set the transactions root field of the header.
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pub fn set_transactions_root(&mut self, a: H256) { self.transactions_root = a; self.note_dirty() }
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/// Set the receipts root field of the header.
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pub fn set_receipts_root(&mut self, a: H256) { self.receipts_root = a; self.note_dirty() }
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/// Set the log bloom field of the header.
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pub fn set_log_bloom(&mut self, a: LogBloom) { self.log_bloom = a; self.note_dirty() }
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/// Set the timestamp field of the header.
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pub fn set_timestamp(&mut self, a: u64) { self.timestamp = a; self.note_dirty(); }
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/// Set the timestamp field of the header to the current time.
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pub fn set_timestamp_now(&mut self, but_later_than: u64) { self.timestamp = cmp::max(get_time().sec as u64, but_later_than + 1); self.note_dirty(); }
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/// Set the number field of the header.
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pub fn set_number(&mut self, a: BlockNumber) { self.number = a; self.note_dirty(); }
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/// Set the author field of the header.
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pub fn set_author(&mut self, a: Address) { if a != self.author { self.author = a; self.note_dirty(); } }
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/// Set the extra data field of the header.
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pub fn set_extra_data(&mut self, a: Bytes) { if a != self.extra_data { self.extra_data = a; self.note_dirty(); } }
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/// Set the gas used field of the header.
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pub fn set_gas_used(&mut self, a: U256) { self.gas_used = a; self.note_dirty(); }
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/// Set the gas limit field of the header.
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pub fn set_gas_limit(&mut self, a: U256) { self.gas_limit = a; self.note_dirty(); }
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/// Set the difficulty field of the header.
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pub fn set_difficulty(&mut self, a: U256) { self.difficulty = a; self.note_dirty(); }
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/// Set the seal field of the header.
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pub fn set_seal(&mut self, a: Vec<Bytes>) { self.seal = a; self.note_dirty(); }
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/// Get the hash of this header (keccak of the RLP).
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pub fn hash(&self) -> H256 {
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let mut hash = self.hash.borrow_mut();
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match &mut *hash {
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&mut Some(ref h) => h.clone(),
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hash @ &mut None => {
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let h = self.rlp_keccak(Seal::With);
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*hash = Some(h.clone());
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h
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}
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}
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}
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/// Get the hash of the header excluding the seal
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pub fn bare_hash(&self) -> H256 {
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let mut hash = self.bare_hash.borrow_mut();
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match &mut *hash {
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&mut Some(ref h) => h.clone(),
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hash @ &mut None => {
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let h = self.rlp_keccak(Seal::Without);
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*hash = Some(h.clone());
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h
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}
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}
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}
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/// Note that some fields have changed. Resets the memoised hash.
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pub fn note_dirty(&self) {
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*self.hash.borrow_mut() = None;
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*self.bare_hash.borrow_mut() = None;
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}
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// TODO: make these functions traity
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/// Place this header into an RLP stream `s`, optionally `with_seal`.
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pub fn stream_rlp(&self, s: &mut RlpStream, with_seal: Seal) {
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s.begin_list(13 + match with_seal { Seal::With => self.seal.len(), _ => 0 });
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s.append(&self.parent_hash);
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s.append(&self.uncles_hash);
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s.append(&self.author);
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s.append(&self.state_root);
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s.append(&self.transactions_root);
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s.append(&self.receipts_root);
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s.append(&self.log_bloom);
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s.append(&self.difficulty);
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s.append(&self.number);
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s.append(&self.gas_limit);
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s.append(&self.gas_used);
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s.append(&self.timestamp);
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s.append(&self.extra_data);
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if let Seal::With = with_seal {
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for b in &self.seal {
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s.append_raw(b, 1);
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}
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}
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}
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/// Get the RLP of this header, optionally `with_seal`.
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pub fn rlp(&self, with_seal: Seal) -> Bytes {
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let mut s = RlpStream::new();
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self.stream_rlp(&mut s, with_seal);
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s.out()
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}
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/// Get the SHA3 (Keccak) of this header, optionally `with_seal`.
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pub fn rlp_keccak(&self, with_seal: Seal) -> H256 { keccak(self.rlp(with_seal)) }
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/// Encode the header, getting a type-safe wrapper around the RLP.
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pub fn encoded(&self) -> ::encoded::Header {
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::encoded::Header::new(self.rlp(Seal::With))
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}
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}
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impl Decodable for Header {
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fn decode(r: &UntrustedRlp) -> Result<Self, DecoderError> {
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let mut blockheader = Header {
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parent_hash: r.val_at(0)?,
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uncles_hash: r.val_at(1)?,
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author: r.val_at(2)?,
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state_root: r.val_at(3)?,
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transactions_root: r.val_at(4)?,
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receipts_root: r.val_at(5)?,
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log_bloom: r.val_at(6)?,
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difficulty: r.val_at(7)?,
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number: r.val_at(8)?,
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gas_limit: r.val_at(9)?,
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gas_used: r.val_at(10)?,
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timestamp: cmp::min(r.val_at::<U256>(11)?, u64::max_value().into()).as_u64(),
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extra_data: r.val_at(12)?,
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seal: vec![],
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hash: RefCell::new(Some(keccak(r.as_raw()))),
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bare_hash: RefCell::new(None),
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};
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for i in 13..r.item_count()? {
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blockheader.seal.push(r.at(i)?.as_raw().to_vec())
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}
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Ok(blockheader)
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}
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}
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impl Encodable for Header {
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fn rlp_append(&self, s: &mut RlpStream) {
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self.stream_rlp(s, Seal::With);
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}
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}
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impl HeapSizeOf for Header {
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fn heap_size_of_children(&self) -> usize {
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self.extra_data.heap_size_of_children() + self.seal.heap_size_of_children()
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}
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}
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impl ::parity_machine::Header for Header {
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fn bare_hash(&self) -> H256 { Header::bare_hash(self) }
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fn hash(&self) -> H256 { Header::hash(self) }
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fn seal(&self) -> &[Vec<u8>] { Header::seal(self) }
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fn author(&self) -> &Address { Header::author(self) }
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fn number(&self) -> BlockNumber { Header::number(self) }
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}
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impl ::parity_machine::ScoredHeader for Header {
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fn score(&self) -> &U256 { self.difficulty() }
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fn set_score(&mut self, score: U256) { self.set_difficulty(score) }
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}
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#[cfg(test)]
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mod tests {
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use rustc_hex::FromHex;
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use rlp;
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use super::Header;
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#[test]
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fn test_header_seal_fields() {
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// that's rlp of block header created with ethash engine.
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let header_rlp = "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".from_hex().unwrap();
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let mix_hash = "a0a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd".from_hex().unwrap();
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let mix_hash_decoded = "a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd".from_hex().unwrap();
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let nonce = "88ab4e252a7e8c2a23".from_hex().unwrap();
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let nonce_decoded = "ab4e252a7e8c2a23".from_hex().unwrap();
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let header: Header = rlp::decode(&header_rlp);
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let seal_fields = header.seal.clone();
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assert_eq!(seal_fields.len(), 2);
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assert_eq!(seal_fields[0], mix_hash);
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assert_eq!(seal_fields[1], nonce);
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let decoded_seal = header.decode_seal::<Vec<_>>().unwrap();
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assert_eq!(decoded_seal.len(), 2);
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assert_eq!(decoded_seal[0], &*mix_hash_decoded);
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assert_eq!(decoded_seal[1], &*nonce_decoded);
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}
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#[test]
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fn decode_and_encode_header() {
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// that's rlp of block header created with ethash engine.
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let header_rlp = "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".from_hex().unwrap();
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let header: Header = rlp::decode(&header_rlp);
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let encoded_header = rlp::encode(&header).into_vec();
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assert_eq!(header_rlp, encoded_header);
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}
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}
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