100 lines
3.4 KiB
Rust
100 lines
3.4 KiB
Rust
// Copyright 2015-2017 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::service::ClientIoMessage;
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use ethsync::LightSync;
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use io::{IoContext, IoHandler, TimerToken};
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use light::client::Client;
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use light::on_demand::{request, OnDemand};
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use light::TransactionQueue;
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use futures::{future, stream, Future, Stream};
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use parity_reactor::Remote;
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use util::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_MS: u64 = 1000 * 60 * 10;
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// But make each attempt last only 9 minutes
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const PURGE_TIMEOUT_MS: u64 = 1000 * 60 * 9;
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/// Periodically culls the transaction queue of mined transactions.
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pub struct QueueCull {
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/// A handle to the client, for getting the latest block header.
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pub client: Arc<Client>,
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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 remote.
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pub remote: Remote,
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}
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impl IoHandler<ClientIoMessage> for QueueCull {
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fn initialize(&self, io: &IoContext<ClientIoMessage>) {
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io.register_timer(TOKEN, TIMEOUT_MS).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();
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info!(target: "cull", "Attempting to cull queued transactions from {} senders.", senders.len());
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self.remote.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_futures = senders.iter()
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.map(|&address| request::Account { header: best_header.clone(), address: address })
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.map(|request| on_demand.account(ctx, request))
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.map(move |fut| fut.map(move |x| x.map(|acc| acc.nonce).unwrap_or(start_nonce)))
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.zip(senders.iter())
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.map(|(fut, &addr)| fut.map(move |nonce| (addr, nonce)));
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// as they come in, update each sender to the new nonce.
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stream::futures_unordered(nonce_futures)
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.fold(txq, |txq, (address, nonce)| {
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txq.write().cull(address, nonce);
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future::ok(txq)
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})
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.map(|_| ()) // finally, discard the txq handle and log errors.
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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) => fut.boxed(),
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None => future::ok(()).boxed(),
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}
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}, Duration::from_millis(PURGE_TIMEOUT_MS), || {})
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}
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}
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