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use std::sync::{Arc, Weak};
use std::collections::HashSet;
use jsonrpc_core::*;
use ethcore::miner::MinerService;
use ethcore::filter::Filter as EthcoreFilter;
use ethcore::client::{BlockChainClient, BlockId};
use util::Mutex;
use v1::traits::EthFilter;
use v1::types::{BlockNumber, Index, Filter, FilterChanges, Log, H256 as RpcH256, U256 as RpcU256};
use v1::helpers::{PollFilter, PollManager, limit_logs};
use v1::impls::eth::pending_logs;
pub struct EthFilterClient<C, M> where
C: BlockChainClient,
M: MinerService {
client: Weak<C>,
miner: Weak<M>,
polls: Mutex<PollManager<PollFilter>>,
}
impl<C, M> EthFilterClient<C, M> where
C: BlockChainClient,
M: MinerService {
pub fn new(client: &Arc<C>, miner: &Arc<M>) -> Self {
EthFilterClient {
client: Arc::downgrade(client),
miner: Arc::downgrade(miner),
polls: Mutex::new(PollManager::new()),
}
}
fn active(&self) -> Result<(), Error> {
take_weak!(self.client).keep_alive();
Ok(())
}
}
impl<C, M> EthFilter for EthFilterClient<C, M>
where C: BlockChainClient + 'static, M: MinerService + 'static
{
fn new_filter(&self, filter: Filter) -> Result<RpcU256, Error> {
self.active()?;
let mut polls = self.polls.lock();
let block_number = take_weak!(self.client).chain_info().best_block_number;
let id = polls.create_poll(PollFilter::Logs(block_number, Default::default(), filter));
Ok(id.into())
}
fn new_block_filter(&self) -> Result<RpcU256, Error> {
self.active()?;
let mut polls = self.polls.lock();
let id = polls.create_poll(PollFilter::Block(take_weak!(self.client).chain_info().best_block_number));
Ok(id.into())
}
fn new_pending_transaction_filter(&self) -> Result<RpcU256, Error> {
self.active()?;
let mut polls = self.polls.lock();
let best_block = take_weak!(self.client).chain_info().best_block_number;
let pending_transactions = take_weak!(self.miner).pending_transactions_hashes(best_block);
let id = polls.create_poll(PollFilter::PendingTransaction(pending_transactions));
Ok(id.into())
}
fn filter_changes(&self, index: Index) -> Result<FilterChanges, Error> {
self.active()?;
let client = take_weak!(self.client);
let mut polls = self.polls.lock();
match polls.poll_mut(&index.value()) {
None => Ok(FilterChanges::Empty),
Some(filter) => match *filter {
PollFilter::Block(ref mut block_number) => {
let current_number = client.chain_info().best_block_number + 1;
let hashes = (*block_number..current_number).into_iter()
.map(BlockId::Number)
.filter_map(|id| client.block_hash(id))
.map(Into::into)
.collect::<Vec<RpcH256>>();
*block_number = current_number;
Ok(FilterChanges::Hashes(hashes))
},
PollFilter::PendingTransaction(ref mut previous_hashes) => {
let best_block = take_weak!(self.client).chain_info().best_block_number;
let current_hashes = take_weak!(self.miner).pending_transactions_hashes(best_block);
let new_hashes =
{
let previous_hashes_set = previous_hashes.iter().collect::<HashSet<_>>();
current_hashes
.iter()
.filter(|hash| !previous_hashes_set.contains(hash))
.cloned()
.map(Into::into)
.collect::<Vec<RpcH256>>()
};
*previous_hashes = current_hashes;
Ok(FilterChanges::Hashes(new_hashes))
},
PollFilter::Logs(ref mut block_number, ref mut previous_logs, ref filter) => {
let current_number = client.chain_info().best_block_number;
let include_pending = filter.to_block == Some(BlockNumber::Pending);
let mut filter: EthcoreFilter = filter.clone().into();
filter.from_block = BlockId::Number(*block_number);
filter.to_block = BlockId::Latest;
let mut logs = client.logs(filter.clone())
.into_iter()
.map(From::from)
.collect::<Vec<Log>>();
if include_pending {
let best_block = take_weak!(self.client).chain_info().best_block_number;
let pending_logs = pending_logs(&*take_weak!(self.miner), best_block, &filter);
let new_pending_logs: Vec<_> = pending_logs.iter()
.filter(|p| !previous_logs.contains(p))
.cloned()
.collect();
*previous_logs = pending_logs.into_iter().collect();
logs.extend(new_pending_logs);
}
let logs = limit_logs(logs, filter.limit);
*block_number = current_number + 1;
Ok(FilterChanges::Logs(logs))
}
}
}
}
fn filter_logs(&self, index: Index) -> Result<Vec<Log>, Error> {
self.active()?;
let mut polls = self.polls.lock();
match polls.poll(&index.value()) {
Some(&PollFilter::Logs(ref _block_number, ref _previous_log, ref filter)) => {
let include_pending = filter.to_block == Some(BlockNumber::Pending);
let filter: EthcoreFilter = filter.clone().into();
let mut logs = take_weak!(self.client).logs(filter.clone())
.into_iter()
.map(From::from)
.collect::<Vec<Log>>();
if include_pending {
let best_block = take_weak!(self.client).chain_info().best_block_number;
logs.extend(pending_logs(&*take_weak!(self.miner), best_block, &filter));
}
let logs = limit_logs(logs, filter.limit);
Ok(logs)
},
_ => Ok(Vec::new()),
}
}
fn uninstall_filter(&self, index: Index) -> Result<bool, Error> {
self.active()?;
self.polls.lock().remove_poll(&index.value());
Ok(true)
}
}