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use std::collections::VecDeque;
use std::sync::Arc;
use std::sync::mpsc::{channel, Sender, Receiver};
use std::sync::atomic::{AtomicBool, Ordering};
use std::thread;
use parking_lot::Mutex;
use time::get_time;
use chain::{IndexedBlock, IndexedTransaction};
use network::ConsensusParams;
use primitives::hash::H256;
use verification::{BackwardsCompatibleChainVerifier as ChainVerifier, Verify as VerificationVerify,
Error as VerificationError, VerificationLevel};
use types::{BlockHeight, StorageRef, MemoryPoolRef};
use utils::MemoryPoolTransactionOutputProvider;
use VerificationParameters;
pub trait BlockVerificationSink : Send + Sync + 'static {
fn on_block_verification_success(&self, block: IndexedBlock) -> Option<Vec<VerificationTask>>;
fn on_block_verification_error(&self, err: &str, hash: &H256);
}
pub trait TransactionVerificationSink : Send + Sync + 'static {
fn on_transaction_verification_success(&self, transaction: IndexedTransaction);
fn on_transaction_verification_error(&self, err: &str, hash: &H256);
}
pub trait VerificationSink : BlockVerificationSink + TransactionVerificationSink {
}
#[derive(Debug)]
pub enum VerificationTask {
VerifyBlock(IndexedBlock),
VerifyTransaction(BlockHeight, IndexedTransaction),
Stop,
}
pub trait Verifier : Send + Sync + 'static {
fn verify_block(&self, block: IndexedBlock);
fn verify_transaction(&self, height: BlockHeight, transaction: IndexedTransaction);
}
pub struct AsyncVerifier {
verification_work_sender: Mutex<Sender<VerificationTask>>,
verification_worker_thread: Option<thread::JoinHandle<()>>,
}
pub struct ChainVerifierWrapper {
pub verifier: Arc<ChainVerifier>,
verification_params: VerificationParameters,
pub enforce_full_verification: AtomicBool,
}
impl ChainVerifierWrapper {
pub fn new(verifier: Arc<ChainVerifier>, storage: &StorageRef, verification_params: VerificationParameters) -> Self {
let enforce_full_verification = AtomicBool::new(storage.contains_block(verification_params.verification_edge.clone().into()));
ChainVerifierWrapper {
verifier: verifier,
verification_params: verification_params,
enforce_full_verification: enforce_full_verification,
}
}
pub fn verify_block(&self, block: &IndexedBlock) -> Result<(), VerificationError> {
let enforce_full_verification = if block.hash() == &self.verification_params.verification_edge {
self.enforce_full_verification.store(true, Ordering::Relaxed);
true
} else {
self.enforce_full_verification.load(Ordering::Relaxed)
};
let verification_level = if enforce_full_verification {
VerificationLevel::Full
} else {
self.verification_params.verification_level
};
self.verifier.verify(verification_level, block)
}
}
impl VerificationTask {
pub fn transaction(&self) -> Option<&IndexedTransaction> {
match *self {
VerificationTask::VerifyTransaction(_, ref transaction) => Some(transaction),
_ => None,
}
}
}
impl AsyncVerifier {
pub fn new<T: VerificationSink>(verifier: Arc<ChainVerifier>, storage: StorageRef, memory_pool: MemoryPoolRef, sink: Arc<T>, verification_params: VerificationParameters) -> Self {
let (verification_work_sender, verification_work_receiver) = channel();
AsyncVerifier {
verification_work_sender: Mutex::new(verification_work_sender),
verification_worker_thread: Some(thread::Builder::new()
.name("Sync verification thread".to_string())
.spawn(move || {
let verifier = ChainVerifierWrapper::new(verifier, &storage, verification_params);
AsyncVerifier::verification_worker_proc(sink, storage, memory_pool, verifier, verification_work_receiver)
})
.expect("Error creating sync verification thread"))
}
}
fn verification_worker_proc<T: VerificationSink>(sink: Arc<T>, storage: StorageRef, memory_pool: MemoryPoolRef, verifier: ChainVerifierWrapper, work_receiver: Receiver<VerificationTask>) {
while let Ok(task) = work_receiver.recv() {
if !AsyncVerifier::execute_single_task(&sink, &storage, &memory_pool, &verifier, task) {
break;
}
}
trace!(target: "sync", "Stopping sync verification thread");
}
pub fn execute_single_task<T: VerificationSink>(sink: &Arc<T>, storage: &StorageRef, memory_pool: &MemoryPoolRef, verifier: &ChainVerifierWrapper, task: VerificationTask) -> bool {
let mut tasks_queue: VecDeque<VerificationTask> = VecDeque::new();
tasks_queue.push_back(task);
while let Some(task) = tasks_queue.pop_front() {
match task {
VerificationTask::VerifyBlock(block) => {
match verifier.verify_block(&block) {
Ok(_) => {
if let Some(tasks) = sink.on_block_verification_success(block) {
tasks_queue.extend(tasks);
}
},
Err(e) => {
sink.on_block_verification_error(&format!("{:?}", e), block.hash())
}
}
},
VerificationTask::VerifyTransaction(height, transaction) => {
match MemoryPoolTransactionOutputProvider::for_transaction(storage.clone(), memory_pool, &transaction.raw) {
Err(e) => {
sink.on_transaction_verification_error(&format!("{:?}", e), &transaction.hash);
continue;
},
Ok(tx_output_provider) => {
let time: u32 = get_time().sec as u32;
match verifier.verifier.verify_mempool_transaction(storage.as_block_header_provider(), &tx_output_provider, height, time, &transaction.raw) {
Ok(_) => sink.on_transaction_verification_success(transaction.into()),
Err(e) => sink.on_transaction_verification_error(&format!("{:?}", e), &transaction.hash),
}
},
};
},
VerificationTask::Stop => return false,
}
}
true
}
}
impl Drop for AsyncVerifier {
fn drop(&mut self) {
if let Some(join_handle) = self.verification_worker_thread.take() {
{
let verification_work_sender = self.verification_work_sender.lock();
let _ = verification_work_sender.send(VerificationTask::Stop);
}
join_handle.join().expect("Clean shutdown.");
}
}
}
impl Verifier for AsyncVerifier {
fn verify_block(&self, block: IndexedBlock) {
self.verification_work_sender.lock()
.send(VerificationTask::VerifyBlock(block))
.expect("Verification thread have the same lifetime as `AsyncVerifier`");
}
fn verify_transaction(&self, height: BlockHeight, transaction: IndexedTransaction) {
self.verification_work_sender.lock()
.send(VerificationTask::VerifyTransaction(height, transaction))
.expect("Verification thread have the same lifetime as `AsyncVerifier`");
}
}
pub struct SyncVerifier<T: VerificationSink> {
verifier: ChainVerifierWrapper,
sink: Arc<T>,
}
impl<T> SyncVerifier<T> where T: VerificationSink {
pub fn new(consensus: ConsensusParams, storage: StorageRef, sink: Arc<T>, verification_params: VerificationParameters) -> Self {
let verifier = ChainVerifier::new(storage.clone(), consensus);
let verifier = ChainVerifierWrapper::new(Arc::new(verifier), &storage, verification_params);
SyncVerifier {
verifier: verifier,
sink: sink,
}
}
}
impl<T> Verifier for SyncVerifier<T> where T: VerificationSink {
fn verify_block(&self, block: IndexedBlock) {
match self.verifier.verify_block(&block) {
Ok(_) => {
self.sink.on_block_verification_success(block);
},
Err(e) => self.sink.on_block_verification_error(&format!("{:?}", e), block.hash()),
}
}
fn verify_transaction(&self, _height: BlockHeight, _transaction: IndexedTransaction) {
unimplemented!()
}
}
#[cfg(test)]
pub mod tests {
extern crate test_data;
use std::sync::Arc;
use std::sync::atomic::Ordering;
use std::collections::{HashSet, HashMap};
use db::BlockChainDatabase;
use network::{Network, ConsensusParams, ConsensusFork};
use verification::{VerificationLevel, BackwardsCompatibleChainVerifier as ChainVerifier, Error as VerificationError, TransactionError};
use synchronization_client_core::CoreVerificationSink;
use synchronization_executor::tests::DummyTaskExecutor;
use primitives::hash::H256;
use chain::{IndexedBlock, IndexedTransaction};
use super::{Verifier, BlockVerificationSink, TransactionVerificationSink, AsyncVerifier, VerificationTask, ChainVerifierWrapper};
use types::{BlockHeight, StorageRef, MemoryPoolRef};
use script::Error as ScriptError;
use VerificationParameters;
#[derive(Default)]
pub struct DummyVerifier {
sink: Option<Arc<CoreVerificationSink<DummyTaskExecutor>>>,
errors: HashMap<H256, String>,
actual_checks: HashSet<H256>,
storage: Option<StorageRef>,
memory_pool: Option<MemoryPoolRef>,
verifier: Option<ChainVerifierWrapper>,
}
impl DummyVerifier {
pub fn set_sink(&mut self, sink: Arc<CoreVerificationSink<DummyTaskExecutor>>) {
self.sink = Some(sink);
}
pub fn set_storage(&mut self, storage: StorageRef) {
self.storage = Some(storage);
}
pub fn set_memory_pool(&mut self, memory_pool: MemoryPoolRef) {
self.memory_pool = Some(memory_pool);
}
pub fn set_verifier(&mut self, verifier: Arc<ChainVerifier>) {
self.verifier = Some(ChainVerifierWrapper::new(verifier, self.storage.as_ref().unwrap(), VerificationParameters {
verification_level: VerificationLevel::Full,
verification_edge: 0u8.into(),
}));
}
pub fn error_when_verifying(&mut self, hash: H256, err: &str) {
self.errors.insert(hash, err.into());
}
pub fn actual_check_when_verifying(&mut self, hash: H256) {
self.actual_checks.insert(hash);
}
}
impl Verifier for DummyVerifier {
fn verify_block(&self, block: IndexedBlock) {
match self.sink {
Some(ref sink) => match self.errors.get(&block.hash()) {
Some(err) => sink.on_block_verification_error(&err, &block.hash()),
None => {
if self.actual_checks.contains(block.hash()) {
AsyncVerifier::execute_single_task(sink, self.storage.as_ref().unwrap(), self.memory_pool.as_ref().unwrap(), self.verifier.as_ref().unwrap(), VerificationTask::VerifyBlock(block));
} else {
sink.on_block_verification_success(block);
}
},
},
None => panic!("call set_sink"),
}
}
fn verify_transaction(&self, _height: BlockHeight, transaction: IndexedTransaction) {
match self.sink {
Some(ref sink) => match self.errors.get(&transaction.hash) {
Some(err) => sink.on_transaction_verification_error(&err, &transaction.hash),
None => {
if self.actual_checks.contains(&transaction.hash) {
let next_block_height = self.storage.as_ref().unwrap().best_block().number + 1;
AsyncVerifier::execute_single_task(sink, self.storage.as_ref().unwrap(), self.memory_pool.as_ref().unwrap(), self.verifier.as_ref().unwrap(), VerificationTask::VerifyTransaction(next_block_height, transaction));
} else {
sink.on_transaction_verification_success(transaction.into());
}
},
},
None => panic!("call set_sink"),
}
}
}
#[test]
fn verifier_wrapper_switches_to_full_mode() {
let storage: StorageRef = Arc::new(BlockChainDatabase::init_test_chain(vec![test_data::genesis().into()]));
let verifier = Arc::new(ChainVerifier::new(storage.clone(), ConsensusParams::new(Network::Unitest, ConsensusFork::BitcoinCore)));
assert_eq!(ChainVerifierWrapper::new(verifier.clone(), &storage, VerificationParameters {
verification_level: VerificationLevel::NoVerification,
verification_edge: test_data::genesis().hash(),
}).enforce_full_verification.load(Ordering::Relaxed), true);
let wrapper = ChainVerifierWrapper::new(verifier, &storage, VerificationParameters {
verification_level: VerificationLevel::NoVerification,
verification_edge: test_data::block_h1().hash(),
});
assert_eq!(wrapper.enforce_full_verification.load(Ordering::Relaxed), false);
let block: IndexedBlock = test_data::block_h1().into();
let _ = wrapper.verify_block(&block);
assert_eq!(wrapper.enforce_full_verification.load(Ordering::Relaxed), true);
}
#[test]
fn verification_level_header_accept_incorrect_transaction() {
let mut blocks: Vec<IndexedBlock> = vec![test_data::genesis().into()];
let mut rolling_hash = blocks[0].hash().clone();
for _ in 1..101 {
let next_block = test_data::block_builder()
.transaction()
.coinbase()
.output().value(5000000000).build()
.build()
.merkled_header()
.parent(rolling_hash.clone())
.bits(Network::Unitest.max_bits().into())
.build()
.build();
rolling_hash = next_block.hash();
blocks.push(next_block.into());
}
let coinbase_transaction_hash = blocks[0].transactions[0].hash.clone();
let last_block_hash = blocks[blocks.len() - 1].hash().clone();
let storage: StorageRef = Arc::new(BlockChainDatabase::init_test_chain(blocks));
let verifier = Arc::new(ChainVerifier::new(storage.clone(), ConsensusParams::new(Network::Unitest, ConsensusFork::BitcoinCore)));
let bad_transaction_block: IndexedBlock = test_data::block_builder()
.transaction().coinbase().output().value(50).build().build()
.transaction()
.input().hash(coinbase_transaction_hash).build()
.output().value(1000).build()
.build()
.merkled_header()
.parent(last_block_hash)
.bits(Network::Unitest.max_bits().into())
.build()
.build().into();
let wrapper = ChainVerifierWrapper::new(verifier.clone(), &storage, VerificationParameters {
verification_level: VerificationLevel::Header,
verification_edge: 1.into(),
});
assert_eq!(wrapper.verify_block(&bad_transaction_block), Ok(()));
let wrapper = ChainVerifierWrapper::new(verifier, &storage, VerificationParameters {
verification_level: VerificationLevel::Full,
verification_edge: 1.into(),
});
assert_eq!(wrapper.verify_block(&bad_transaction_block), Err(VerificationError::Transaction(1, TransactionError::Signature(0, ScriptError::InvalidStackOperation))));
}
#[test]
fn verification_level_none_accept_incorrect_block() {
let storage: StorageRef = Arc::new(BlockChainDatabase::init_test_chain(vec![test_data::genesis().into()]));
let verifier = Arc::new(ChainVerifier::new(storage.clone(), ConsensusParams::new(Network::Unitest, ConsensusFork::BitcoinCore)));
let bad_block: IndexedBlock = test_data::block_builder().header().build().build().into();
let wrapper = ChainVerifierWrapper::new(verifier.clone(), &storage, VerificationParameters {
verification_level: VerificationLevel::NoVerification,
verification_edge: 1.into(),
});
assert_eq!(wrapper.verify_block(&bad_block), Ok(()));
let wrapper = ChainVerifierWrapper::new(verifier, &storage, VerificationParameters {
verification_level: VerificationLevel::Full,
verification_edge: 1.into(),
});
assert_eq!(wrapper.verify_block(&bad_block), Err(VerificationError::Empty));
}
}