106 lines
3.5 KiB
Rust
106 lines
3.5 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
|
|
// This file is part of Parity.
|
|
|
|
// Parity is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// Parity is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//! Service for culling the light client's transaction queue.
|
|
|
|
use std::sync::Arc;
|
|
use std::time::Duration;
|
|
|
|
use ethcore::service::ClientIoMessage;
|
|
use ethsync::LightSync;
|
|
use io::{IoContext, IoHandler, TimerToken};
|
|
|
|
use light::client::Client;
|
|
use light::on_demand::{request, OnDemand};
|
|
use light::TransactionQueue;
|
|
|
|
use futures::{future, Future};
|
|
|
|
use parity_reactor::Remote;
|
|
|
|
use util::RwLock;
|
|
|
|
// Attepmt to cull once every 10 minutes.
|
|
const TOKEN: TimerToken = 1;
|
|
const TIMEOUT_MS: u64 = 1000 * 60 * 10;
|
|
|
|
// But make each attempt last only 9 minutes
|
|
const PURGE_TIMEOUT_MS: u64 = 1000 * 60 * 9;
|
|
|
|
/// Periodically culls the transaction queue of mined transactions.
|
|
pub struct QueueCull {
|
|
/// A handle to the client, for getting the latest block header.
|
|
pub client: Arc<Client>,
|
|
/// A handle to the sync service.
|
|
pub sync: Arc<LightSync>,
|
|
/// The on-demand request service.
|
|
pub on_demand: Arc<OnDemand>,
|
|
/// The transaction queue.
|
|
pub txq: Arc<RwLock<TransactionQueue>>,
|
|
/// Event loop remote.
|
|
pub remote: Remote,
|
|
}
|
|
|
|
impl IoHandler<ClientIoMessage> for QueueCull {
|
|
fn initialize(&self, io: &IoContext<ClientIoMessage>) {
|
|
io.register_timer(TOKEN, TIMEOUT_MS).expect("Error registering timer");
|
|
}
|
|
|
|
fn timeout(&self, _io: &IoContext<ClientIoMessage>, timer: TimerToken) {
|
|
if timer != TOKEN { return }
|
|
|
|
let senders = self.txq.read().queued_senders();
|
|
if senders.is_empty() { return }
|
|
|
|
let (sync, on_demand, txq) = (self.sync.clone(), self.on_demand.clone(), self.txq.clone());
|
|
let best_header = self.client.best_block_header();
|
|
let start_nonce = self.client.engine().account_start_nonce(best_header.number());
|
|
|
|
info!(target: "cull", "Attempting to cull queued transactions from {} senders.", senders.len());
|
|
self.remote.spawn_with_timeout(move || {
|
|
let maybe_fetching = sync.with_context(move |ctx| {
|
|
// fetch the nonce of each sender in the queue.
|
|
let nonce_reqs = senders.iter()
|
|
.map(|&address| request::Account { header: best_header.clone().into(), address: address })
|
|
.collect::<Vec<_>>();
|
|
|
|
// when they come in, update each sender to the new nonce.
|
|
on_demand.request(ctx, nonce_reqs)
|
|
.expect("No back-references; therefore all back-references are valid; qed")
|
|
.map(move |accs| {
|
|
let txq = txq.write();
|
|
let _ = accs.into_iter()
|
|
.map(|maybe_acc| maybe_acc.map_or(start_nonce, |acc| acc.nonce))
|
|
.zip(senders)
|
|
.fold(txq, |mut txq, (nonce, addr)| {
|
|
txq.cull(addr, nonce);
|
|
txq
|
|
});
|
|
})
|
|
.map_err(|_| debug!(target: "cull", "OnDemand prematurely closed channel."))
|
|
});
|
|
|
|
match maybe_fetching {
|
|
Some(fut) => fut.boxed(),
|
|
None => {
|
|
debug!(target: "cull", "Unable to acquire network context; qed");
|
|
future::ok(()).boxed()
|
|
}
|
|
}
|
|
}, Duration::from_millis(PURGE_TIMEOUT_MS), || {})
|
|
}
|
|
}
|