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fix(light cull): poll light cull instead of timer (#10559) 

* fix(light cull): poll light cull instead of timer

* fix(grumbles): remove error + updated docs

* fix(on-demand request): `expect()` reason

* docs(remove misleading info)
This commit is contained in:
Niklas Adolfsson 2019-04-04 10:59:07 +02:00 committed by Hernando Castano
parent 69085aa282
commit 10e1787ad1
6 changed files with 54 additions and 125 deletions
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2
Cargo.lock generated
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@ -1152,8 +1152,8 @@ dependencies = [
"log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
"macros 0.1.0",
"parity-bytes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
"parity-runtime 0.1.0",
"parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
"rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
"rlp 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
"rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",

2
parity/light_helpers/mod.rs
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@ -17,7 +17,5 @@
//! Utilities and helpers for the light client.
mod epoch_fetch;
mod queue_cull;
pub use self::epoch_fetch::EpochFetch;
pub use self::queue_cull::QueueCull;

105
parity/light_helpers/queue_cull.rs
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@ -1,105 +0,0 @@
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.
// Parity Ethereum 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 Ethereum 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 Ethereum. 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::client::ClientIoMessage;
use sync::{LightSync, LightNetworkDispatcher};
use io::{IoContext, IoHandler, TimerToken};
use light::client::LightChainClient;
use light::on_demand::{request, OnDemand, OnDemandRequester};
use light::TransactionQueue;
use futures::{future, Future};
use parity_runtime::Executor;
use parking_lot::RwLock;
// Attepmt to cull once every 10 minutes.
const TOKEN: TimerToken = 1;
const TIMEOUT: Duration = Duration::from_secs(60 * 10);
// But make each attempt last only 9 minutes
const PURGE_TIMEOUT: Duration = Duration::from_secs(60 * 9);
/// Periodically culls the transaction queue of mined transactions.
pub struct QueueCull<T> {
/// A handle to the client, for getting the latest block header.
pub client: Arc<T>,
/// 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 executor.
pub executor: Executor,
}
impl<T: LightChainClient + 'static> IoHandler<ClientIoMessage> for QueueCull<T> {
fn initialize(&self, io: &IoContext<ClientIoMessage>) {
io.register_timer(TOKEN, TIMEOUT).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.executor.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) => future::Either::A(fut),
None => {
debug!(target: "cull", "Unable to acquire network context; qed");
future::Either::B(future::ok(()))
},
}
}, PURGE_TIMEOUT, || {})
}
}

11
parity/run.rs
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@ -295,17 +295,6 @@ fn execute_light_impl<Cr>(cmd: RunCmd, logger: Arc<RotatingLogger>, on_client_rq
// spin up event loop
let runtime = Runtime::with_default_thread_count();
// queue cull service.
let queue_cull = Arc::new(::light_helpers::QueueCull {
client: client.clone(),
sync: light_sync.clone(),
on_demand: on_demand.clone(),
txq: txq.clone(),
executor: runtime.executor(),
});
service.register_handler(queue_cull).map_err(|e| format!("Error attaching service: {:?}", e))?;
// start the network.
light_sync.start_network();

44
rpc/src/v1/helpers/light_fetch.rs
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@ -16,8 +16,9 @@
//! Helpers for fetching blockchain data either from the light client or the network.
use std::cmp;
use std::clone::Clone;
use std::cmp;
use std::collections::BTreeMap;
use std::sync::Arc;
use types::basic_account::BasicAccount;
@ -48,7 +49,6 @@ use ethereum_types::{Address, U256};
use hash::H256;
use parking_lot::{Mutex, RwLock};
use fastmap::H256FastMap;
use std::collections::BTreeMap;
use types::transaction::{Action, Transaction as EthTransaction, PendingTransaction, SignedTransaction, LocalizedTransaction};
use v1::helpers::{CallRequest as CallRequestHelper, errors, dispatch};
@ -522,6 +522,46 @@ where
}))
}
/// Helper to cull the `light` transaction queue of mined transactions
pub fn light_cull(&self, txq: Arc<RwLock<TransactionQueue>>) -> impl Future <Item = (), Error = Error> + Send {
let senders = txq.read().queued_senders();
if senders.is_empty() {
return Either::B(future::err(errors::internal("No pending local transactions", "")));
}
let sync = self.sync.clone();
let on_demand = self.on_demand.clone();
let best_header = self.client.best_block_header();
let start_nonce = self.client.engine().account_start_nonce(best_header.number());
let account_request = 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 })
.collect::<Vec<_>>();
// when they come in, update each sender to the new nonce.
on_demand.request(ctx, nonce_reqs)
.expect(NO_INVALID_BACK_REFS_PROOF)
.map(move |accs| {
let mut txq = txq.write();
accs.into_iter()
.map(|maybe_acc| maybe_acc.map_or(start_nonce, |acc| acc.nonce))
.zip(senders)
.for_each(|(nonce, addr)| {
txq.cull(addr, nonce);
});
})
.map_err(errors::on_demand_error)
});
if let Some(fut) = account_request {
Either::A(fut)
} else {
Either::B(future::err(errors::network_disabled()))
}
}
fn send_requests<T, F>(&self, reqs: Vec<OnDemandRequest>, parse_response: F) -> impl Future<Item = T, Error = Error> + Send where
F: FnOnce(Vec<OnDemandResponse>) -> T + Send + 'static,
T: Send + 'static,

15
rpc/src/v1/impls/light/eth.rs
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@ -420,15 +420,22 @@ where
}
fn transaction_by_hash(&self, hash: H256) -> BoxFuture<Option<Transaction>> {
{
let tx_queue = self.transaction_queue.read();
if let Some(tx) = tx_queue.get(&hash) {
let in_txqueue = self.transaction_queue.read().get(&hash).is_some();
// The transaction is in the `local txqueue` then fetch the latest state from the network and attempt
// to cull the transaction queue.
if in_txqueue {
// Note, this will block (relies on HTTP timeout) to make sure `cull` will finish to avoid having to call
// `eth_getTransactionByHash` more than once to ensure the `txqueue` is up to `date` when it is called
if let Err(e) = self.fetcher().light_cull(self.transaction_queue.clone()).wait() {
debug!(target: "cull", "failed because of: {:?}", e);
}
if let Some(tx) = self.transaction_queue.read().get(&hash) {
return Box::new(future::ok(Some(Transaction::from_pending(
tx.clone(),
))));
}
}
Box::new(self.fetcher().transaction_by_hash(hash).map(|x| x.map(|(tx, _)| tx)))
}