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use bit_vec::BitVec;
use chain::{IndexedBlock, IndexedTransaction};
use message::types;
use primitives::bytes::Bytes;
use primitives::hash::H256;
use synchronization_peers::MerkleBlockArtefacts;
use utils::{KnownHashFilter, KnownHashType, BloomFilter, FeeRateFilter, build_compact_block, build_partial_merkle_tree};
#[derive(Debug, Default)]
pub struct ConnectionFilter {
known_hash_filter: KnownHashFilter,
fee_rate_filter: FeeRateFilter,
bloom_filter: BloomFilter,
}
impl ConnectionFilter {
pub fn hash_known_as(&mut self, hash: H256, hash_type: KnownHashType) {
self.known_hash_filter.insert(hash, hash_type);
}
pub fn is_hash_known_as(&self, hash: &H256, hash_type: KnownHashType) -> bool {
self.known_hash_filter.contains(hash, hash_type)
}
pub fn filter_block(&self, block_hash: &H256) -> bool {
self.known_hash_filter.filter_block(block_hash)
}
pub fn filter_transaction(&self, transaction: &IndexedTransaction, transaction_fee_rate: Option<u64>) -> bool {
self.known_hash_filter.filter_transaction(&transaction.hash)
&& self.fee_rate_filter.filter_transaction(transaction_fee_rate)
&& self.bloom_filter.filter_transaction(transaction)
}
pub fn load(&mut self, message: types::FilterLoad) {
self.bloom_filter.set_bloom_filter(message);
}
pub fn add(&mut self, message: types::FilterAdd) {
self.bloom_filter.update_bloom_filter(message);
}
pub fn clear(&mut self) {
self.bloom_filter.remove_bloom_filter();
}
pub fn set_fee_rate(&mut self, message: types::FeeFilter) {
self.fee_rate_filter.set_min_fee_rate(message);
}
pub fn build_compact_block(&self, block: &IndexedBlock) -> types::CompactBlock {
let unknown_transaction_indexes = block.transactions.iter().enumerate()
.filter(|&(_, tx)| self.known_hash_filter.contains(&tx.hash, KnownHashType::Transaction))
.map(|(idx, _)| idx)
.collect();
types::CompactBlock {
header: build_compact_block(block, unknown_transaction_indexes),
}
}
pub fn build_merkle_block(&self, block: &IndexedBlock) -> Option<MerkleBlockArtefacts> {
if !self.bloom_filter.is_set() {
return None;
}
let all_len = block.transactions.len();
let mut result = MerkleBlockArtefacts {
merkleblock: types::MerkleBlock {
block_header: block.header.raw.clone(),
total_transactions: all_len as u32,
hashes: Vec::default(),
flags: Bytes::default(),
},
matching_transactions: Vec::new(),
};
let (all_hashes, all_flags) = block.transactions.iter()
.fold((Vec::<H256>::with_capacity(all_len), BitVec::with_capacity(all_len)), |(mut all_hashes, mut all_flags), t| {
let flag = self.bloom_filter.filter_transaction(t);
all_flags.push(flag);
all_hashes.push(t.hash.clone());
if flag {
result.matching_transactions.push(t.clone());
}
(all_hashes, all_flags)
});
let partial_merkle_tree = build_partial_merkle_tree(all_hashes, all_flags);
result.merkleblock.hashes.extend(partial_merkle_tree.hashes);
result.merkleblock.flags = partial_merkle_tree.flags.to_bytes().into_iter()
.map(|b|
((b & 0b10000000) >> 7) |
((b & 0b01000000) >> 5) |
((b & 0b00100000) >> 3) |
((b & 0b00010000) >> 1) |
((b & 0b00001000) << 1) |
((b & 0b00000100) << 3) |
((b & 0b00000010) << 5) |
((b & 0b00000001) << 7)).collect::<Vec<u8>>().into();
Some(result)
}
}
#[cfg(test)]
pub mod tests {
extern crate test_data;
use std::iter::repeat;
use chain::IndexedTransaction;
use message::types;
use primitives::bytes::Bytes;
use super::ConnectionFilter;
use utils::KnownHashType;
#[test]
fn filter_default_accepts_block() {
assert!(ConnectionFilter::default().filter_block(&test_data::genesis().hash()));
}
#[test]
fn filter_default_accepts_transaction() {
assert!(ConnectionFilter::default().filter_transaction(&test_data::genesis().transactions[0].clone().into(), Some(0)));
}
#[test]
fn filter_rejects_block_known() {
let mut filter = ConnectionFilter::default();
filter.hash_known_as(test_data::block_h1().hash(), KnownHashType::Block);
filter.hash_known_as(test_data::block_h2().hash(), KnownHashType::CompactBlock);
assert!(!filter.filter_block(&test_data::block_h1().hash()));
assert!(!filter.filter_block(&test_data::block_h2().hash()));
assert!(filter.filter_block(&test_data::genesis().hash()));
}
#[test]
fn filter_rejects_transaction_known() {
let mut filter = ConnectionFilter::default();
filter.hash_known_as(test_data::block_h1().transactions[0].hash(), KnownHashType::Transaction);
assert!(!filter.filter_transaction(&test_data::block_h1().transactions[0].clone().into(), None));
assert!(filter.filter_transaction(&test_data::block_h2().transactions[0].clone().into(), None));
}
#[test]
fn filter_rejects_transaction_feerate() {
let mut filter = ConnectionFilter::default();
filter.set_fee_rate(types::FeeFilter::with_fee_rate(1000));
assert!(filter.filter_transaction(&test_data::block_h1().transactions[0].clone().into(), None));
assert!(filter.filter_transaction(&test_data::block_h1().transactions[0].clone().into(), Some(1500)));
assert!(!filter.filter_transaction(&test_data::block_h1().transactions[0].clone().into(), Some(500)));
}
#[test]
fn filter_rejects_transaction_bloomfilter() {
let mut filter = ConnectionFilter::default();
let tx: IndexedTransaction = test_data::block_h1().transactions[0].clone().into();
filter.load(types::FilterLoad {
filter: Bytes::from(repeat(0u8).take(1024).collect::<Vec<_>>()),
hash_functions: 10,
tweak: 5,
flags: types::FilterFlags::None,
});
assert!(!filter.filter_transaction(&tx, None));
filter.add(types::FilterAdd {
data: (&*tx.hash as &[u8]).into(),
});
assert!(filter.filter_transaction(&tx, None));
filter.clear();
assert!(filter.filter_transaction(&tx, None));
}
}