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use std::{
collections::HashMap,
fmt,
sync::Arc,
};
use ethereum_types::{H256, U256, Address};
use ethcore_miner::pool;
use ethcore_miner::pool::client::NonceClient;
use transaction::{
self,
UnverifiedTransaction,
SignedTransaction,
};
use parking_lot::RwLock;
use account_provider::AccountProvider;
use client::{TransactionId, BlockInfo, CallContract, Nonce};
use engines::EthEngine;
use header::Header;
use miner;
use miner::service_transaction_checker::ServiceTransactionChecker;
#[derive(Debug, Clone)]
pub struct NonceCache {
nonces: Arc<RwLock<HashMap<Address, U256>>>,
limit: usize
}
impl NonceCache {
pub fn new(limit: usize) -> Self {
NonceCache {
nonces: Arc::new(RwLock::new(HashMap::with_capacity(limit / 2))),
limit,
}
}
pub fn get(&self, sender: &Address) -> Option<U256> {
self.nonces.read().get(sender).cloned()
}
pub fn clear(&self) {
self.nonces.write().clear();
}
}
pub struct PoolClient<'a, C: 'a> {
chain: &'a C,
cached_nonces: CachedNonceClient<'a, C>,
engine: &'a EthEngine,
accounts: Option<&'a AccountProvider>,
best_block_header: Header,
service_transaction_checker: Option<ServiceTransactionChecker>,
}
impl<'a, C: 'a> Clone for PoolClient<'a, C> {
fn clone(&self) -> Self {
PoolClient {
chain: self.chain,
cached_nonces: self.cached_nonces.clone(),
engine: self.engine,
accounts: self.accounts.clone(),
best_block_header: self.best_block_header.clone(),
service_transaction_checker: self.service_transaction_checker.clone(),
}
}
}
impl<'a, C: 'a> PoolClient<'a, C> where
C: BlockInfo + CallContract,
{
pub fn new(
chain: &'a C,
cache: &'a NonceCache,
engine: &'a EthEngine,
accounts: Option<&'a AccountProvider>,
refuse_service_transactions: bool,
) -> Self {
let best_block_header = chain.best_block_header();
PoolClient {
chain,
cached_nonces: CachedNonceClient::new(chain, cache),
engine,
accounts,
best_block_header,
service_transaction_checker: if refuse_service_transactions {
None
} else {
Some(Default::default())
},
}
}
pub fn verify_signed(&self, tx: &SignedTransaction) -> Result<(), transaction::Error> {
self.engine.machine().verify_transaction(&tx, &self.best_block_header, self.chain)
}
}
impl<'a, C: 'a> fmt::Debug for PoolClient<'a, C> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "PoolClient")
}
}
impl<'a, C: 'a> pool::client::Client for PoolClient<'a, C> where
C: miner::TransactionVerifierClient + Sync,
{
fn transaction_already_included(&self, hash: &H256) -> bool {
self.chain.transaction_block(TransactionId::Hash(*hash)).is_some()
}
fn verify_transaction(&self, tx: UnverifiedTransaction)-> Result<SignedTransaction, transaction::Error> {
self.engine.verify_transaction_basic(&tx, &self.best_block_header)?;
let tx = self.engine.verify_transaction_unordered(tx, &self.best_block_header)?;
self.verify_signed(&tx)?;
Ok(tx)
}
fn account_details(&self, address: &Address) -> pool::client::AccountDetails {
pool::client::AccountDetails {
nonce: self.cached_nonces.account_nonce(address),
balance: self.chain.latest_balance(address),
is_local: self.accounts.map_or(false, |accounts| accounts.has_account(*address)),
}
}
fn required_gas(&self, tx: &transaction::Transaction) -> U256 {
tx.gas_required(&self.chain.latest_schedule()).into()
}
fn transaction_type(&self, tx: &SignedTransaction) -> pool::client::TransactionType {
match self.service_transaction_checker {
None => pool::client::TransactionType::Regular,
Some(ref checker) => match checker.check(self.chain, &tx) {
Ok(true) => pool::client::TransactionType::Service,
Ok(false) => pool::client::TransactionType::Regular,
Err(e) => {
debug!(target: "txqueue", "Unable to verify service transaction: {:?}", e);
pool::client::TransactionType::Regular
},
}
}
}
fn decode_transaction(&self, transaction: &[u8]) -> Result<UnverifiedTransaction, transaction::Error> {
self.engine.decode_transaction(transaction)
}
}
impl<'a, C: 'a> NonceClient for PoolClient<'a, C> where
C: Nonce + Sync,
{
fn account_nonce(&self, address: &Address) -> U256 {
self.cached_nonces.account_nonce(address)
}
}
pub(crate) struct CachedNonceClient<'a, C: 'a> {
client: &'a C,
cache: &'a NonceCache,
}
impl<'a, C: 'a> Clone for CachedNonceClient<'a, C> {
fn clone(&self) -> Self {
CachedNonceClient {
client: self.client,
cache: self.cache,
}
}
}
impl<'a, C: 'a> fmt::Debug for CachedNonceClient<'a, C> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.debug_struct("CachedNonceClient")
.field("cache", &self.cache.nonces.read().len())
.field("limit", &self.cache.limit)
.finish()
}
}
impl<'a, C: 'a> CachedNonceClient<'a, C> {
pub fn new(client: &'a C, cache: &'a NonceCache) -> Self {
CachedNonceClient {
client,
cache,
}
}
}
impl<'a, C: 'a> NonceClient for CachedNonceClient<'a, C> where
C: Nonce + Sync,
{
fn account_nonce(&self, address: &Address) -> U256 {
if let Some(nonce) = self.cache.nonces.read().get(address) {
return *nonce;
}
let mut cache = self.cache.nonces.write();
let nonce = self.client.latest_nonce(address);
cache.insert(*address, nonce);
if cache.len() < self.cache.limit {
return nonce
}
debug!(target: "txpool", "NonceCache: reached limit.");
trace_time!("nonce_cache:clear");
let to_remove: Vec<_> = cache.keys().take(self.cache.limit / 2).cloned().collect();
for x in to_remove {
cache.remove(&x);
}
nonce
}
}