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use std::collections::{HashMap, HashSet, VecDeque};
use std::collections::hash_map::Entry;
use linked_hash_map::LinkedHashMap;
use time;
use chain::IndexedTransaction;
use primitives::hash::H256;
#[derive(Debug)]
pub struct OrphanTransactionsPool {
by_hash: LinkedHashMap<H256, OrphanTransaction>,
by_parent: HashMap<H256, HashSet<H256>>,
}
#[derive(Debug)]
pub struct OrphanTransaction {
pub insertion_time: f64,
pub transaction: IndexedTransaction,
pub unknown_parents: HashSet<H256>,
}
impl OrphanTransactionsPool {
pub fn new() -> Self {
OrphanTransactionsPool {
by_hash: LinkedHashMap::new(),
by_parent: HashMap::new(),
}
}
#[cfg(test)]
pub fn len(&self) -> usize {
self.by_hash.len()
}
pub fn transactions(&self) -> &LinkedHashMap<H256, OrphanTransaction> {
&self.by_hash
}
pub fn contains(&self, hash: &H256) -> bool {
self.by_hash.contains_key(hash)
}
pub fn insert(&mut self, transaction: IndexedTransaction, unknown_parents: HashSet<H256>) {
assert!(!self.by_hash.contains_key(&transaction.hash));
assert!(unknown_parents.iter().all(|h| transaction.raw.inputs.iter().any(|i| &i.previous_output.hash == h)));
for unknown_parent in &unknown_parents {
self.by_parent.entry(unknown_parent.clone())
.or_insert_with(HashSet::new)
.insert(transaction.hash.clone());
}
let hash = transaction.hash.clone();
self.by_hash.insert(hash, OrphanTransaction::new(transaction, unknown_parents));
}
pub fn remove_transactions_for_parent(&mut self, hash: &H256) -> Vec<IndexedTransaction> {
assert!(!self.by_hash.contains_key(hash));
let mut removal_queue: VecDeque<H256> = VecDeque::new();
removal_queue.push_back(hash.clone());
let mut removed_orphans: Vec<IndexedTransaction> = Vec::new();
while let Some(hash) = removal_queue.pop_front() {
let mut removed_orphans_hashes: Vec<H256> = Vec::new();
if let Entry::Occupied(children_entry) = self.by_parent.entry(hash.clone()) {
for child in children_entry.get() {
let all_parents_are_known = match self.by_hash.get_mut(child) {
Some(child_entry) => child_entry.remove_known_parent(&hash),
None => false,
};
if all_parents_are_known {
removed_orphans_hashes.push(child.clone());
removed_orphans.push(self.by_hash.remove(child).expect("checked couple of lines above").transaction);
}
}
children_entry.remove_entry();
}
removal_queue.extend(removed_orphans_hashes);
}
removed_orphans
}
pub fn remove_transactions(&mut self, hashes: &[H256]) -> Vec<IndexedTransaction> {
let mut removed: Vec<IndexedTransaction> = Vec::new();
for hash in hashes {
if let Some(transaction) = self.by_hash.remove(hash) {
removed.push(transaction.transaction);
}
removed.extend(self.remove_transactions_for_parent(hash));
}
removed
}
}
impl OrphanTransaction {
pub fn new(transaction: IndexedTransaction, unknown_parents: HashSet<H256>) -> Self {
OrphanTransaction {
insertion_time: time::precise_time_s(),
transaction: transaction,
unknown_parents: unknown_parents,
}
}
pub fn remove_known_parent(&mut self, parent_hash: &H256) -> bool {
self.unknown_parents.remove(parent_hash);
self.unknown_parents.is_empty()
}
}
#[cfg(test)]
mod tests {
extern crate test_data;
use std::collections::HashSet;
use self::test_data::{TransactionBuilder, ChainBuilder};
use primitives::hash::H256;
use super::OrphanTransactionsPool;
#[test]
fn orphan_transaction_pool_empty_on_start() {
let pool = OrphanTransactionsPool::new();
assert_eq!(pool.len(), 0);
}
#[test]
fn orphan_transaction_pool_insert_dependent_transactions() {
let chain = &mut ChainBuilder::new();
TransactionBuilder::with_output(100).store(chain)
.into_input(0).add_output(200).store(chain)
.into_input(0).add_output(300).store(chain)
.set_default_input(0).set_output(400).store(chain)
.into_input(0).set_output(500).store(chain);
let t2_unknown: HashSet<H256> = chain.at(1).inputs.iter().map(|i| i.previous_output.hash.clone()).collect();
let t3_unknown: HashSet<H256> = chain.at(2).inputs.iter().map(|i| i.previous_output.hash.clone()).collect();
let t5_unknown: HashSet<H256> = chain.at(4).inputs.iter().map(|i| i.previous_output.hash.clone()).collect();
let mut pool = OrphanTransactionsPool::new();
pool.insert(chain.at(1).into(), t2_unknown);
pool.insert(chain.at(2).into(), t3_unknown);
pool.insert(chain.at(4).into(), t5_unknown);
assert_eq!(pool.len(), 3);
let removed = pool.remove_transactions_for_parent(&chain.at(0).hash());
assert_eq!(pool.len(), 1);
let removed: Vec<H256> = removed.into_iter().map(|tx| tx.hash).collect();
assert_eq!(removed, vec![chain.at(1).hash(), chain.at(2).hash()]);
let removed = pool.remove_transactions_for_parent(&chain.at(3).hash());
assert_eq!(pool.len(), 0);
let removed: Vec<H256> = removed.into_iter().map(|tx| tx.hash).collect();
assert_eq!(removed, vec![chain.at(4).hash()]);
}
#[test]
fn orphan_transaction_pool_remove_transactions() {
let chain = &mut ChainBuilder::new();
TransactionBuilder::with_output(100).store(chain)
.into_input(0).add_output(200).store(chain)
.into_input(0).add_output(300).store(chain)
.set_default_input(0).set_output(400).store(chain)
.into_input(0).set_output(500).store(chain)
.set_default_input(0).set_output(600).store(chain)
.into_input(0).set_output(700).store(chain);
let t2_unknown: HashSet<H256> = chain.at(1).inputs.iter().map(|i| i.previous_output.hash.clone()).collect();
let t3_unknown: HashSet<H256> = chain.at(2).inputs.iter().map(|i| i.previous_output.hash.clone()).collect();
let t5_unknown: HashSet<H256> = chain.at(4).inputs.iter().map(|i| i.previous_output.hash.clone()).collect();
let t7_unknown: HashSet<H256> = chain.at(6).inputs.iter().map(|i| i.previous_output.hash.clone()).collect();
let mut pool = OrphanTransactionsPool::new();
pool.insert(chain.at(1).into(), t2_unknown);
pool.insert(chain.at(2).into(), t3_unknown);
pool.insert(chain.at(4).into(), t5_unknown);
pool.insert(chain.at(6).into(), t7_unknown);
assert_eq!(pool.len(), 4);
let removed = pool.remove_transactions(&vec![chain.at(1).hash(), chain.at(3).hash()]);
assert_eq!(pool.len(), 1);
let removed: Vec<H256> = removed.into_iter().map(|tx| tx.hash).collect();
assert_eq!(removed, vec![chain.at(1).hash(), chain.at(2).hash(), chain.at(4).hash()]);
let removed = pool.remove_transactions(&vec![chain.at(6).hash()]);
assert_eq!(pool.len(), 0);
let removed: Vec<H256> = removed.into_iter().map(|tx| tx.hash).collect();
assert_eq!(removed, vec![chain.at(6).hash()]);
}
#[test]
fn orphan_transaction_pool_remove_transactions_child_before_parent() {
let chain = &mut ChainBuilder::new();
TransactionBuilder::with_output(100).store(chain)
.into_input(0).add_output(200).store(chain)
.into_input(0).add_output(300).store(chain);
let t2_unknown: HashSet<H256> = chain.at(1).inputs.iter().map(|i| i.previous_output.hash.clone()).collect();
let t3_unknown: HashSet<H256> = chain.at(2).inputs.iter().map(|i| i.previous_output.hash.clone()).collect();
let mut pool = OrphanTransactionsPool::new();
pool.insert(chain.at(1).into(), t2_unknown);
pool.insert(chain.at(2).into(), t3_unknown);
pool.remove_transactions(&[chain.at(2).hash(), chain.at(1).hash()]);
}
}