openethereum/ethcore/src/views/views.rs

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// Copyright 2015, 2016 Ethcore (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/>.
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//! Block oriented views onto rlp.
use util::*;
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use header::*;
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use transaction::*;
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use super::TransactionView;
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/// View onto transaction rlp.
pub struct AccountView<'a> {
rlp: Rlp<'a>
}
impl<'a> AccountView<'a> {
/// Creates new view onto block from raw bytes.
pub fn new(bytes: &'a [u8]) -> AccountView<'a> {
AccountView {
rlp: Rlp::new(bytes)
}
}
/// Creates new view onto block from rlp.
pub fn new_from_rlp(rlp: Rlp<'a>) -> AccountView<'a> {
AccountView {
rlp: rlp
}
}
/// Return reference to underlaying rlp.
pub fn rlp(&self) -> &Rlp<'a> {
&self.rlp
}
/// Get the nonce field of the transaction.
pub fn nonce(&self) -> U256 { self.rlp.val_at(0) }
/// Get the gas_price field of the transaction.
pub fn balance(&self) -> U256 { self.rlp.val_at(1) }
/// Get the gas field of the transaction.
pub fn storage_root(&self) -> H256 { self.rlp.val_at(2) }
/// Get the value field of the transaction.
pub fn code_hash(&self) -> H256 { self.rlp.val_at(3) }
}
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/// View onto block rlp.
pub struct BlockView<'a> {
rlp: Rlp<'a>
}
impl<'a> BlockView<'a> {
/// Creates new view onto block from raw bytes.
pub fn new(bytes: &'a [u8]) -> BlockView<'a> {
BlockView {
rlp: Rlp::new(bytes)
}
}
/// Creates new view onto block from rlp.
pub fn new_from_rlp(rlp: Rlp<'a>) -> BlockView<'a> {
BlockView {
rlp: rlp
}
}
/// Return reference to underlaying rlp.
pub fn rlp(&self) -> &Rlp<'a> {
&self.rlp
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}
/// Create new Header object from header rlp.
pub fn header(&self) -> Header {
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self.rlp.val_at(0)
}
/// Create new header view obto block head rlp.
pub fn header_view(&self) -> HeaderView<'a> {
HeaderView::new_from_rlp(self.rlp.at(0))
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}
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/// Return List of transactions in given block.
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pub fn transactions(&self) -> Vec<SignedTransaction> {
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self.rlp.val_at(1)
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}
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/// Return List of transactions with additional localization info.
pub fn localized_transactions(&self) -> Vec<LocalizedTransaction> {
let header = self.header_view();
let block_hash = header.sha3();
let block_number = header.number();
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self.transactions()
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.into_iter()
.enumerate()
.map(|(i, t)| LocalizedTransaction {
signed: t,
block_hash: block_hash.clone(),
block_number: block_number,
transaction_index: i
}).collect()
}
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/// Return number of transactions in given block, without deserializing them.
pub fn transactions_count(&self) -> usize {
self.rlp.at(1).iter().count()
}
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/// Return List of transactions in given block.
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pub fn transaction_views(&self) -> Vec<TransactionView> {
self.rlp.at(1).iter().map(TransactionView::new_from_rlp).collect()
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}
/// Return transaction hashes.
pub fn transaction_hashes(&self) -> Vec<H256> {
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self.rlp.at(1).iter().map(|rlp| rlp.as_raw().sha3()).collect()
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}
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/// Returns transaction at given index without deserializing unnecessary data.
pub fn transaction_at(&self, index: usize) -> Option<SignedTransaction> {
self.rlp.at(1).iter().nth(index).map(|rlp| rlp.as_val())
}
/// Returns localized transaction at given index.
pub fn localized_transaction_at(&self, index: usize) -> Option<LocalizedTransaction> {
let header = self.header_view();
let block_hash = header.sha3();
let block_number = header.number();
self.transaction_at(index).map(|t| LocalizedTransaction {
signed: t,
block_hash: block_hash,
block_number: block_number,
transaction_index: index
})
}
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/// Return list of uncles of given block.
pub fn uncles(&self) -> Vec<Header> {
self.rlp.val_at(2)
}
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/// Return number of uncles in given block, without deserializing them.
pub fn uncles_count(&self) -> usize {
self.rlp.at(2).iter().count()
}
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/// Return List of transactions in given block.
pub fn uncle_views(&self) -> Vec<HeaderView> {
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self.rlp.at(2).iter().map(HeaderView::new_from_rlp).collect()
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}
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/// Return list of uncle hashes of given block.
pub fn uncle_hashes(&self) -> Vec<H256> {
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self.rlp.at(2).iter().map(|rlp| rlp.as_raw().sha3()).collect()
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}
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/// Return nth uncle.
pub fn uncle_at(&self, index: usize) -> Option<Header> {
self.rlp.at(2).iter().nth(index).map(|rlp| rlp.as_val())
}
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}
impl<'a> Hashable for BlockView<'a> {
fn sha3(&self) -> H256 {
self.header_view().sha3()
}
}
/// View onto block header rlp.
pub struct HeaderView<'a> {
rlp: Rlp<'a>
}
impl<'a> HeaderView<'a> {
/// Creates new view onto header from raw bytes.
pub fn new(bytes: &'a [u8]) -> HeaderView<'a> {
HeaderView {
rlp: Rlp::new(bytes)
}
}
/// Creates new view onto header from rlp.
pub fn new_from_rlp(rlp: Rlp<'a>) -> HeaderView<'a> {
HeaderView {
rlp: rlp
}
}
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/// Returns header hash.
pub fn hash(&self) -> H256 { self.sha3() }
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/// Returns raw rlp.
pub fn rlp(&self) -> &Rlp<'a> { &self.rlp }
/// Returns parent hash.
pub fn parent_hash(&self) -> H256 { self.rlp.val_at(0) }
/// Returns uncles hash.
pub fn uncles_hash(&self) -> H256 { self.rlp.val_at(1) }
/// Returns author.
pub fn author(&self) -> Address { self.rlp.val_at(2) }
/// Returns state root.
pub fn state_root(&self) -> H256 { self.rlp.val_at(3) }
/// Returns transactions root.
pub fn transactions_root(&self) -> H256 { self.rlp.val_at(4) }
/// Returns block receipts root.
pub fn receipts_root(&self) -> H256 { self.rlp.val_at(5) }
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/// Returns block log bloom.
pub fn log_bloom(&self) -> H2048 { self.rlp.val_at(6) }
/// Returns block difficulty.
pub fn difficulty(&self) -> U256 { self.rlp.val_at(7) }
/// Returns block number.
pub fn number(&self) -> BlockNumber { self.rlp.val_at(8) }
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/// Returns block gas limit.
pub fn gas_limit(&self) -> U256 { self.rlp.val_at(9) }
/// Returns block gas used.
pub fn gas_used(&self) -> U256 { self.rlp.val_at(10) }
/// Returns timestamp.
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pub fn timestamp(&self) -> u64 { self.rlp.val_at(11) }
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/// Returns block extra data.
pub fn extra_data(&self) -> Bytes { self.rlp.val_at(12) }
/// Returns a vector of post-RLP-encoded seal fields.
pub fn seal(&self) -> Vec<Bytes> {
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let mut seal = vec![];
for i in 13..self.rlp.item_count() {
seal.push(self.rlp.at(i).as_raw().to_vec());
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}
seal
}
}
impl<'a> Hashable for HeaderView<'a> {
fn sha3(&self) -> H256 {
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self.rlp.as_raw().sha3()
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}
}
#[cfg(test)]
mod tests {
use rustc_serialize::hex::FromHex;
use super::BlockView;
#[test]
fn test_header_view_seal_fields() {
// that's rlp of block created with ethash engine.
let block_rlp = "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".from_hex().unwrap();
let mix_hash = "a0a0349d8c3df71f1a48a9df7d03fd5f14aeee7d91332c009ecaff0a71ead405bd".from_hex().unwrap();
let nonce = "88ab4e252a7e8c2a23".from_hex().unwrap();
let block_view = BlockView::new(&block_rlp);
let header_view = block_view.header_view();
let seal_fields = header_view.seal();
assert_eq!(seal_fields.len(), 2);
assert_eq!(seal_fields[0], mix_hash);
assert_eq!(seal_fields[1], nonce);
}
}