106 lines
3.5 KiB
Rust
106 lines
3.5 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! Service for culling the light client's transaction queue.
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use std::sync::Arc;
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use std::time::Duration;
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use ethcore::client::ClientIoMessage;
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use sync::LightSync;
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use io::{IoContext, IoHandler, TimerToken};
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use light::client::LightChainClient;
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use light::on_demand::{request, OnDemand};
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use light::TransactionQueue;
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use futures::{future, Future};
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use parity_runtime::Executor;
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use parking_lot::RwLock;
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// Attepmt to cull once every 10 minutes.
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const TOKEN: TimerToken = 1;
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const TIMEOUT: Duration = Duration::from_secs(60 * 10);
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// But make each attempt last only 9 minutes
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const PURGE_TIMEOUT: Duration = Duration::from_secs(60 * 9);
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/// Periodically culls the transaction queue of mined transactions.
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pub struct QueueCull<T> {
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/// A handle to the client, for getting the latest block header.
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pub client: Arc<T>,
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/// A handle to the sync service.
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pub sync: Arc<LightSync>,
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/// The on-demand request service.
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pub on_demand: Arc<OnDemand>,
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/// The transaction queue.
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pub txq: Arc<RwLock<TransactionQueue>>,
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/// Event loop executor.
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pub executor: Executor,
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}
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impl<T: LightChainClient + 'static> IoHandler<ClientIoMessage> for QueueCull<T> {
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fn initialize(&self, io: &IoContext<ClientIoMessage>) {
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io.register_timer(TOKEN, TIMEOUT).expect("Error registering timer");
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}
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fn timeout(&self, _io: &IoContext<ClientIoMessage>, timer: TimerToken) {
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if timer != TOKEN { return }
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let senders = self.txq.read().queued_senders();
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if senders.is_empty() { return }
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let (sync, on_demand, txq) = (self.sync.clone(), self.on_demand.clone(), self.txq.clone());
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let best_header = self.client.best_block_header();
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let start_nonce = self.client.engine().account_start_nonce(best_header.number());
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info!(target: "cull", "Attempting to cull queued transactions from {} senders.", senders.len());
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self.executor.spawn_with_timeout(move || {
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let maybe_fetching = sync.with_context(move |ctx| {
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// fetch the nonce of each sender in the queue.
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let nonce_reqs = senders.iter()
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.map(|&address| request::Account { header: best_header.clone().into(), address: address })
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.collect::<Vec<_>>();
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// when they come in, update each sender to the new nonce.
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on_demand.request(ctx, nonce_reqs)
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.expect("No back-references; therefore all back-references are valid; qed")
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.map(move |accs| {
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let txq = txq.write();
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let _ = accs.into_iter()
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.map(|maybe_acc| maybe_acc.map_or(start_nonce, |acc| acc.nonce))
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.zip(senders)
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.fold(txq, |mut txq, (nonce, addr)| {
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txq.cull(addr, nonce);
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txq
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});
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})
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.map_err(|_| debug!(target: "cull", "OnDemand prematurely closed channel."))
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});
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match maybe_fetching {
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Some(fut) => future::Either::A(fut),
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None => {
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debug!(target: "cull", "Unable to acquire network context; qed");
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future::Either::B(future::ok(()))
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},
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}
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}, PURGE_TIMEOUT, || {})
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}
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}
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