164 lines
5.8 KiB
Rust
164 lines
5.8 KiB
Rust
use std::sync::{Arc, RwLock};
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use std::ops;
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use futures::{self, Future, Stream, stream::{Collect, FuturesUnordered, futures_unordered}, Poll};
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use web3::Transport;
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use web3::types::{U256, H520, Address, Bytes, FilterBuilder};
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use api::{self, LogStream};
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use app::App;
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use contracts::foreign;
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use util::web3_filter;
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use database::Database;
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use error::{Error, ErrorKind};
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use message_to_mainnet::{MessageToMainnet, MESSAGE_LENGTH};
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use ethcore_transaction::{Transaction, Action};
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use itertools::Itertools;
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use super::nonce::{NonceCheck, SendRawTransaction};
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use super::BridgeChecked;
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fn withdraws_filter(foreign: &foreign::ForeignBridge, address: Address) -> FilterBuilder {
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let filter = foreign.events().withdraw().create_filter();
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web3_filter(filter, ::std::iter::once(address))
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}
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fn withdraw_submit_signature_payload(foreign: &foreign::ForeignBridge, withdraw_message: Vec<u8>, signature: H520) -> Bytes {
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assert_eq!(withdraw_message.len(), MESSAGE_LENGTH, "ForeignBridge never accepts messages with len != {} bytes; qed", MESSAGE_LENGTH);
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foreign.functions().submit_signature().input(signature.0.to_vec(), withdraw_message).into()
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}
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/// State of withdraw confirmation.
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enum WithdrawConfirmState<T: Transport> {
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/// Withdraw confirm is waiting for logs.
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Wait,
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/// Confirming withdraws.
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ConfirmWithdraws {
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future: Collect<FuturesUnordered<NonceCheck<T, SendRawTransaction<T>>>>,
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block: u64,
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},
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/// All withdraws till given block has been confirmed.
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Yield(Option<u64>),
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}
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pub fn create_withdraw_confirm<T: Transport + Clone>(app: Arc<App<T>>, init: &Database, foreign_balance: Arc<RwLock<Option<U256>>>, foreign_chain_id: u64, foreign_gas_price: Arc<RwLock<u64>>) -> WithdrawConfirm<T> {
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let logs_init = api::LogStreamInit {
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after: init.checked_withdraw_confirm,
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request_timeout: app.config.foreign.request_timeout,
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poll_interval: app.config.foreign.poll_interval,
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confirmations: app.config.foreign.required_confirmations,
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filter: withdraws_filter(&app.foreign_bridge, init.foreign_contract_address.clone()),
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};
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WithdrawConfirm {
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logs: api::log_stream(app.connections.foreign.clone(), app.timer.clone(), logs_init),
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foreign_contract: init.foreign_contract_address,
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state: WithdrawConfirmState::Wait,
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app,
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foreign_balance,
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foreign_chain_id,
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foreign_gas_price,
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}
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}
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pub struct WithdrawConfirm<T: Transport> {
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app: Arc<App<T>>,
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logs: LogStream<T>,
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state: WithdrawConfirmState<T>,
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foreign_contract: Address,
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foreign_balance: Arc<RwLock<Option<U256>>>,
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foreign_chain_id: u64,
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foreign_gas_price: Arc<RwLock<u64>>,
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}
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impl<T: Transport> Stream for WithdrawConfirm<T> {
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type Item = BridgeChecked;
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type Error = Error;
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fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
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// borrow checker...
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let app = &self.app;
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let gas = self.app.config.txs.withdraw_confirm.gas.into();
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let gas_price = U256::from(*self.foreign_gas_price.read().unwrap());
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let contract = self.foreign_contract.clone();
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loop {
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let next_state = match self.state {
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WithdrawConfirmState::Wait => {
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let foreign_balance = self.foreign_balance.read().unwrap();
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if foreign_balance.is_none() {
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warn!("foreign contract balance is unknown");
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return Ok(futures::Async::NotReady);
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}
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let item = try_stream!(self.logs.poll().map_err(|e| ErrorKind::ContextualizedError(Box::new(e), "polling foreign for withdrawals")));
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let len = item.logs.len();
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info!("got {} new withdraws to sign", len);
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let mut messages = item.logs
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.into_iter()
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.map(|log| {
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info!("withdraw is ready for signature submission. tx hash {}", log.transaction_hash.unwrap());
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Ok(MessageToMainnet::from_log(log)?.to_bytes())
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})
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.collect::<Result<Vec<_>, Error>>()?;
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info!("signing");
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let signatures = messages.clone()
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.into_iter()
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.map(|message|
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app.keystore.sign(self.app.config.foreign.account, None, api::eth_data_hash(message)))
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.map_results(|sig| H520::from(sig.into_electrum()))
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.fold_results(vec![], |mut acc, sig| {
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acc.push(sig);
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acc
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})
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.map_err(|e| ErrorKind::SignError(e))?;
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let block = item.to;
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let balance_required = gas * gas_price * U256::from(signatures.len());
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if balance_required > *foreign_balance.as_ref().unwrap() {
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return Err(ErrorKind::InsufficientFunds.into())
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}
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info!("signing complete");
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let confirmations = messages
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.drain(ops::RangeFull)
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.zip(signatures.into_iter())
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.map(|(withdraw_message, signature)| {
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withdraw_submit_signature_payload(&app.foreign_bridge, withdraw_message, signature)
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})
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.map(|payload| {
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let tx = Transaction {
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gas,
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gas_price,
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value: U256::zero(),
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data: payload.0,
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nonce: U256::zero(),
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action: Action::Call(contract),
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};
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api::send_transaction_with_nonce(self.app.connections.foreign.clone(), self.app.clone(), self.app.config.foreign.clone(),
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tx, self.foreign_chain_id, SendRawTransaction(self.app.connections.foreign.clone()))
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}).collect_vec();
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info!("submitting {} signatures", len);
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WithdrawConfirmState::ConfirmWithdraws {
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future: futures_unordered(confirmations).collect(),
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block,
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}
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},
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WithdrawConfirmState::ConfirmWithdraws { ref mut future, block } => {
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let _ = try_ready!(future.poll().map_err(|e| ErrorKind::ContextualizedError(Box::new(e), "sending signature submissions to foreign")));
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info!("submitting signatures complete");
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WithdrawConfirmState::Yield(Some(block))
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},
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WithdrawConfirmState::Yield(ref mut block) => match block.take() {
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None => {
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info!("waiting for new withdraws that should get signed");
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WithdrawConfirmState::Wait
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},
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Some(v) => return Ok(Some(BridgeChecked::WithdrawConfirm(v)).into()),
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}
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};
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self.state = next_state;
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}
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}
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}
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