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use block::Block;
use header::Header;
use views::BlockView;
use rlp::{DecoderError, RlpStream, Stream, UntrustedRlp, View};
use util::{Bytes, Hashable, H256};
use util::triehash::ordered_trie_root;
const HEADER_FIELDS: usize = 8;
const BLOCK_FIELDS: usize = 2;
pub struct AbridgedBlock {
rlp: Bytes,
}
impl AbridgedBlock {
pub fn from_raw(compressed: Bytes) -> Self {
AbridgedBlock {
rlp: compressed,
}
}
pub fn into_inner(self) -> Bytes {
self.rlp
}
pub fn from_block_view(block_view: &BlockView) -> Self {
let header = block_view.header_view();
let seal_fields = header.seal();
let mut stream = RlpStream::new_list(
HEADER_FIELDS +
seal_fields.len() +
BLOCK_FIELDS
);
stream
.append(&header.author())
.append(&header.state_root())
.append(&header.log_bloom())
.append(&header.difficulty())
.append(&header.gas_limit())
.append(&header.gas_used())
.append(&header.timestamp())
.append(&header.extra_data());
stream.append(&block_view.transactions()).append(&block_view.uncles());
for field in seal_fields {
stream.append_raw(&field, 1);
}
AbridgedBlock {
rlp: stream.out(),
}
}
pub fn to_block(&self, parent_hash: H256, number: u64, receipts_root: H256) -> Result<Block, DecoderError> {
let rlp = UntrustedRlp::new(&self.rlp);
let mut header: Header = Default::default();
header.set_parent_hash(parent_hash);
header.set_author(rlp.val_at(0)?);
header.set_state_root(rlp.val_at(1)?);
header.set_log_bloom(rlp.val_at(2)?);
header.set_difficulty(rlp.val_at(3)?);
header.set_number(number);
header.set_gas_limit(rlp.val_at(4)?);
header.set_gas_used(rlp.val_at(5)?);
header.set_timestamp(rlp.val_at(6)?);
header.set_extra_data(rlp.val_at(7)?);
let transactions = rlp.val_at(8)?;
let uncles: Vec<Header> = rlp.val_at(9)?;
header.set_transactions_root(ordered_trie_root(
rlp.at(8)?.iter().map(|r| r.as_raw().to_owned())
));
header.set_receipts_root(receipts_root);
let mut uncles_rlp = RlpStream::new();
uncles_rlp.append(&uncles);
header.set_uncles_hash(uncles_rlp.as_raw().sha3());
let mut seal_fields = Vec::new();
for i in (HEADER_FIELDS + BLOCK_FIELDS)..rlp.item_count() {
let seal_rlp = rlp.at(i)?;
seal_fields.push(seal_rlp.as_raw().to_owned());
}
header.set_seal(seal_fields);
Ok(Block {
header: header,
transactions: transactions,
uncles: uncles,
})
}
}
#[cfg(test)]
mod tests {
use views::BlockView;
use block::Block;
use super::AbridgedBlock;
use types::transaction::{Action, Transaction};
use util::{Address, H256, FixedHash, U256, Bytes};
fn encode_block(b: &Block) -> Bytes {
b.rlp_bytes(::basic_types::Seal::With)
}
#[test]
fn empty_block_abridging() {
let b = Block::default();
let receipts_root = b.header.receipts_root().clone();
let encoded = encode_block(&b);
let abridged = AbridgedBlock::from_block_view(&BlockView::new(&encoded));
assert_eq!(abridged.to_block(H256::new(), 0, receipts_root).unwrap(), b);
}
#[test]
#[should_panic]
fn wrong_number() {
let b = Block::default();
let receipts_root = b.header.receipts_root().clone();
let encoded = encode_block(&b);
let abridged = AbridgedBlock::from_block_view(&BlockView::new(&encoded));
assert_eq!(abridged.to_block(H256::new(), 2, receipts_root).unwrap(), b);
}
#[test]
fn with_transactions() {
let mut b = Block::default();
let t1 = Transaction {
action: Action::Create,
nonce: U256::from(42),
gas_price: U256::from(3000),
gas: U256::from(50_000),
value: U256::from(1),
data: b"Hello!".to_vec()
}.fake_sign(Address::from(0x69));
let t2 = Transaction {
action: Action::Create,
nonce: U256::from(88),
gas_price: U256::from(12345),
gas: U256::from(300000),
value: U256::from(1000000000),
data: "Eep!".into(),
}.fake_sign(Address::from(0x55));
b.transactions.push(t1.into());
b.transactions.push(t2.into());
let receipts_root = b.header.receipts_root().clone();
b.header.set_transactions_root(::util::triehash::ordered_trie_root(
b.transactions.iter().map(::rlp::encode).map(|out| out.to_vec())
));
let encoded = encode_block(&b);
let abridged = AbridgedBlock::from_block_view(&BlockView::new(&encoded[..]));
assert_eq!(abridged.to_block(H256::new(), 0, receipts_root).unwrap(), b);
}
}