mirror of
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516 lines
16 KiB
Rust
516 lines
16 KiB
Rust
#![cfg_attr(docsrs, feature(doc_cfg))]
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#![doc(
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html_logo_url = "https://raw.githubusercontent.com/paradigmxyz/reth/main/assets/reth-docs.png",
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html_favicon_url = "https://avatars0.githubusercontent.com/u/97369466?s=256",
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issue_tracker_base_url = "https://github.com/paradigmxzy/reth/issues/"
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)]
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#![warn(missing_docs, unreachable_pub)]
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#![deny(unused_must_use, rust_2018_idioms)]
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#![doc(test(
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no_crate_inject,
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attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables))
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))]
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//! reth task management
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use crate::{
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metrics::TaskExecutorMetrics,
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shutdown::{signal, Shutdown, Signal},
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};
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use dyn_clone::DynClone;
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use futures_util::{
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future::{select, BoxFuture},
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pin_mut, Future, FutureExt, TryFutureExt,
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};
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use std::{
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any::Any,
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fmt::{Display, Formatter},
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pin::Pin,
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task::{ready, Context, Poll},
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};
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use tokio::{
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runtime::Handle,
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sync::mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender},
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task::JoinHandle,
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};
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use tracing::error;
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use tracing_futures::Instrument;
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pub mod metrics;
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pub mod shutdown;
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/// A type that can spawn tasks.
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///
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/// The main purpose of this type is to abstract over [TaskExecutor] so it's more convenient to
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/// provide default impls for testing.
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///
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///
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/// # Examples
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///
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/// Use the [TokioTaskExecutor] that spawns with [tokio::task::spawn]
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///
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/// ```
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/// # async fn t() {
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/// use reth_tasks::{TaskSpawner, TokioTaskExecutor};
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/// let executor = TokioTaskExecutor::default();
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///
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/// let task = executor.spawn(Box::pin(async {
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/// // -- snip --
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/// }));
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/// task.await.unwrap();
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/// # }
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/// ```
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///
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/// Use the [TaskExecutor] that spawns task directly onto the tokio runtime via the [Handle].
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///
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/// ```
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/// # use reth_tasks::TaskManager;
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/// fn t() {
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/// use reth_tasks::TaskSpawner;
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/// let rt = tokio::runtime::Runtime::new().unwrap();
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/// let manager = TaskManager::new(rt.handle().clone());
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/// let executor = manager.executor();
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/// let task = TaskSpawner::spawn(&executor, Box::pin(async {
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/// // -- snip --
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/// }));
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/// rt.block_on(task).unwrap();
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/// # }
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/// ```
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///
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/// The [TaskSpawner] trait is [DynClone] so `Box<dyn TaskSpawner>` are also `Clone`.
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pub trait TaskSpawner: Send + Sync + Unpin + std::fmt::Debug + DynClone {
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/// Spawns the task onto the runtime.
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/// See also [`Handle::spawn`].
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fn spawn(&self, fut: BoxFuture<'static, ()>) -> JoinHandle<()>;
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/// This spawns a critical task onto the runtime.
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fn spawn_critical(&self, name: &'static str, fut: BoxFuture<'static, ()>) -> JoinHandle<()>;
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/// Spawns a blocking task onto the runtime.
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fn spawn_blocking(&self, fut: BoxFuture<'static, ()>) -> JoinHandle<()>;
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/// This spawns a critical blocking task onto the runtime.
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fn spawn_critical_blocking(
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&self,
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name: &'static str,
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fut: BoxFuture<'static, ()>,
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) -> JoinHandle<()>;
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}
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dyn_clone::clone_trait_object!(TaskSpawner);
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/// An [TaskSpawner] that uses [tokio::task::spawn] to execute tasks
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#[derive(Debug, Clone, Default)]
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#[non_exhaustive]
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pub struct TokioTaskExecutor;
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impl TaskSpawner for TokioTaskExecutor {
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fn spawn(&self, fut: BoxFuture<'static, ()>) -> JoinHandle<()> {
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tokio::task::spawn(fut)
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}
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fn spawn_critical(&self, _name: &'static str, fut: BoxFuture<'static, ()>) -> JoinHandle<()> {
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tokio::task::spawn(fut)
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}
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fn spawn_blocking(&self, fut: BoxFuture<'static, ()>) -> JoinHandle<()> {
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tokio::task::spawn_blocking(move || tokio::runtime::Handle::current().block_on(fut))
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}
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fn spawn_critical_blocking(
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&self,
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_name: &'static str,
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fut: BoxFuture<'static, ()>,
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) -> JoinHandle<()> {
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tokio::task::spawn_blocking(move || tokio::runtime::Handle::current().block_on(fut))
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}
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}
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/// Many reth components require to spawn tasks for long-running jobs. For example `discovery`
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/// spawns tasks to handle egress and ingress of udp traffic or `network` that spawns session tasks
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/// that handle the traffic to and from a peer.
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///
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/// To unify how tasks are created, the [`TaskManager`] provides access to the configured Tokio
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/// runtime. A [`TaskManager`] stores the [`tokio::runtime::Handle`] it is associated with. In this
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/// way it is possible to configure on which runtime a task is executed.
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///
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/// The main purpose of this type is to be able to monitor if a critical task panicked, for
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/// diagnostic purposes, since tokio task essentially fail silently. Therefore, this type is a
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/// Stream that yields the name of panicked task, See [`TaskExecutor::spawn_critical`]. In order to
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/// execute Tasks use the [`TaskExecutor`] type [`TaskManager::executor`].
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pub struct TaskManager {
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/// Handle to the tokio runtime this task manager is associated with.
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///
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/// See [`Handle`] docs.
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handle: Handle,
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/// Sender half for sending panic signals to this type
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panicked_tasks_tx: UnboundedSender<PanickedTaskError>,
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/// Listens for panicked tasks
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panicked_tasks_rx: UnboundedReceiver<PanickedTaskError>,
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/// The [Signal] to fire when all tasks should be shutdown.
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///
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/// This is fired on drop.
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_signal: Signal,
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/// Receiver of the shutdown signal.
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on_shutdown: Shutdown,
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}
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// === impl TaskManager ===
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impl TaskManager {
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/// Create a new instance connected to the given handle's tokio runtime.
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pub fn new(handle: Handle) -> Self {
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let (panicked_tasks_tx, panicked_tasks_rx) = unbounded_channel();
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let (_signal, on_shutdown) = signal();
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Self { handle, panicked_tasks_tx, panicked_tasks_rx, _signal, on_shutdown }
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}
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/// Returns a new [`TaskExecutor`] that can spawn new tasks onto the tokio runtime this type is
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/// connected to.
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pub fn executor(&self) -> TaskExecutor {
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TaskExecutor {
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handle: self.handle.clone(),
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on_shutdown: self.on_shutdown.clone(),
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panicked_tasks_tx: self.panicked_tasks_tx.clone(),
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metrics: Default::default(),
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}
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}
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}
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/// An endless future that resolves if a critical task panicked.
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///
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/// See [`TaskExecutor::spawn_critical`]
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impl Future for TaskManager {
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type Output = PanickedTaskError;
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fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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let err = ready!(self.get_mut().panicked_tasks_rx.poll_recv(cx));
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Poll::Ready(err.expect("stream can not end"))
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}
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}
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/// Error with the name of the task that panicked and an error downcasted to string, if possible.
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#[derive(Debug, thiserror::Error)]
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pub struct PanickedTaskError {
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task_name: &'static str,
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error: Option<String>,
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}
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impl Display for PanickedTaskError {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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let task_name = self.task_name;
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if let Some(error) = &self.error {
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write!(f, "Critical task `{task_name}` panicked: `{error}`")
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} else {
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write!(f, "Critical task `{task_name}` panicked")
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}
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}
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}
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impl PanickedTaskError {
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fn new(task_name: &'static str, error: Box<dyn Any>) -> Self {
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let error = match error.downcast::<String>() {
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Ok(value) => Some(*value),
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Err(error) => match error.downcast::<&str>() {
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Ok(value) => Some(value.to_string()),
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Err(_) => None,
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},
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};
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Self { task_name, error }
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}
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}
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/// A type that can spawn new tokio tasks
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#[derive(Debug, Clone)]
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pub struct TaskExecutor {
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/// Handle to the tokio runtime this task manager is associated with.
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///
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/// See [`Handle`] docs.
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handle: Handle,
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/// Receiver of the shutdown signal.
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on_shutdown: Shutdown,
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/// Sender half for sending panic signals to this type
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panicked_tasks_tx: UnboundedSender<PanickedTaskError>,
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// Task Executor Metrics
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metrics: TaskExecutorMetrics,
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}
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// === impl TaskExecutor ===
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impl TaskExecutor {
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/// Returns the [Handle] to the tokio runtime.
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pub fn handle(&self) -> &Handle {
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&self.handle
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}
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/// Returns the receiver of the shutdown signal.
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pub fn on_shutdown_signal(&self) -> &Shutdown {
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&self.on_shutdown
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}
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/// Spawns a future on the tokio runtime depending on the [TaskKind]
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fn spawn_on_rt<F>(&self, fut: F, task_kind: TaskKind) -> JoinHandle<()>
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where
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F: Future<Output = ()> + Send + 'static,
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{
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match task_kind {
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TaskKind::Default => self.handle.spawn(fut),
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TaskKind::Blocking => {
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let handle = self.handle.clone();
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self.handle.spawn_blocking(move || handle.block_on(fut))
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}
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}
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}
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/// Spawns a regular task depending on the given [TaskKind]
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fn spawn_task_as<F>(&self, fut: F, task_kind: TaskKind) -> JoinHandle<()>
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where
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F: Future<Output = ()> + Send + 'static,
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{
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let on_shutdown = self.on_shutdown.clone();
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let task = async move {
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pin_mut!(fut);
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let _ = select(on_shutdown, fut).await;
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}
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.in_current_span();
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self.spawn_on_rt(task, task_kind)
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}
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/// Spawns the task onto the runtime.
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/// The given future resolves as soon as the [Shutdown] signal is received.
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///
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/// See also [`Handle::spawn`].
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pub fn spawn<F>(&self, fut: F) -> JoinHandle<()>
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where
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F: Future<Output = ()> + Send + 'static,
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{
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self.spawn_task_as(fut, TaskKind::Default)
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}
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/// Spawns a blocking task onto the runtime.
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/// The given future resolves as soon as the [Shutdown] signal is received.
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///
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/// See also [`Handle::spawn_blocking`].
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pub fn spawn_blocking<F>(&self, fut: F) -> JoinHandle<()>
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where
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F: Future<Output = ()> + Send + 'static,
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{
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self.spawn_task_as(fut, TaskKind::Blocking)
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}
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/// Spawns the task onto the runtime.
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/// The given future resolves as soon as the [Shutdown] signal is received.
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///
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/// See also [`Handle::spawn`].
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pub fn spawn_with_signal<F>(&self, f: impl FnOnce(Shutdown) -> F) -> JoinHandle<()>
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where
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F: Future<Output = ()> + Send + 'static,
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{
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let on_shutdown = self.on_shutdown.clone();
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let fut = f(on_shutdown);
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let task = fut.in_current_span();
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self.handle.spawn(task)
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}
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/// Spawns a critical task depending on the given [TaskKind]
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fn spawn_critical_as<F>(
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&self,
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name: &'static str,
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fut: F,
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task_kind: TaskKind,
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) -> JoinHandle<()>
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where
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F: Future<Output = ()> + Send + 'static,
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{
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let panicked_tasks_tx = self.panicked_tasks_tx.clone();
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let on_shutdown = self.on_shutdown.clone();
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// wrap the task in catch unwind
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let task = std::panic::AssertUnwindSafe(fut)
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.catch_unwind()
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.map_err(move |error| {
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let task_error = PanickedTaskError::new(name, error);
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error!("{task_error}");
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let _ = panicked_tasks_tx.send(task_error);
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})
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.in_current_span();
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let task = async move {
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pin_mut!(task);
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let _ = select(on_shutdown, task).await;
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};
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self.spawn_on_rt(task, task_kind)
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}
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/// This spawns a critical blocking task onto the runtime.
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/// The given future resolves as soon as the [Shutdown] signal is received.
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///
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/// If this task panics, the [`TaskManager`] is notified.
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pub fn spawn_critical_blocking<F>(&self, name: &'static str, fut: F) -> JoinHandle<()>
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where
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F: Future<Output = ()> + Send + 'static,
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{
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self.spawn_critical_as(name, fut, TaskKind::Blocking)
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}
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/// This spawns a critical task onto the runtime.
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/// The given future resolves as soon as the [Shutdown] signal is received.
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///
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/// If this task panics, the [`TaskManager`] is notified.
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pub fn spawn_critical<F>(&self, name: &'static str, fut: F) -> JoinHandle<()>
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where
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F: Future<Output = ()> + Send + 'static,
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{
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self.spawn_critical_as(name, fut, TaskKind::Default)
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}
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/// This spawns a critical task onto the runtime.
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///
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/// If this task panics, the [`TaskManager`] is notified.
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pub fn spawn_critical_with_signal<F>(
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&self,
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name: &'static str,
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f: impl FnOnce(Shutdown) -> F,
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) -> JoinHandle<()>
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where
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F: Future<Output = ()> + Send + 'static,
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{
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let panicked_tasks_tx = self.panicked_tasks_tx.clone();
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let on_shutdown = self.on_shutdown.clone();
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let fut = f(on_shutdown);
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// wrap the task in catch unwind
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let task = std::panic::AssertUnwindSafe(fut)
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.catch_unwind()
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.map_err(move |error| {
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let task_error = PanickedTaskError::new(name, error);
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error!("{task_error}");
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let _ = panicked_tasks_tx.send(task_error);
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})
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.map(|_| ())
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.in_current_span();
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self.handle.spawn(task)
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}
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}
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impl TaskSpawner for TaskExecutor {
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fn spawn(&self, fut: BoxFuture<'static, ()>) -> JoinHandle<()> {
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self.metrics.inc_regular_task();
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self.spawn(fut)
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}
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fn spawn_critical(&self, name: &'static str, fut: BoxFuture<'static, ()>) -> JoinHandle<()> {
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self.metrics.inc_critical_tasks();
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TaskExecutor::spawn_critical(self, name, fut)
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}
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fn spawn_blocking(&self, fut: BoxFuture<'static, ()>) -> JoinHandle<()> {
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self.spawn_blocking(fut)
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}
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fn spawn_critical_blocking(
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&self,
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name: &'static str,
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fut: BoxFuture<'static, ()>,
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) -> JoinHandle<()> {
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TaskExecutor::spawn_critical_blocking(self, name, fut)
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}
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}
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/// Determines how a task is spawned
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enum TaskKind {
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/// Spawn the task to the default executor [Handle::spawn]
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Default,
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/// Spawn the task to the blocking executor [Handle::spawn_blocking]
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Blocking,
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}
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|
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::time::Duration;
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|
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#[test]
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fn test_cloneable() {
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#[derive(Clone)]
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struct ExecutorWrapper {
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_e: Box<dyn TaskSpawner>,
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}
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let executor: Box<dyn TaskSpawner> = Box::<TokioTaskExecutor>::default();
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let _e = dyn_clone::clone_box(&*executor);
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let e = ExecutorWrapper { _e };
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let _e2 = e;
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}
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|
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#[test]
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fn test_critical() {
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let runtime = tokio::runtime::Runtime::new().unwrap();
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let handle = runtime.handle().clone();
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let manager = TaskManager::new(handle);
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let executor = manager.executor();
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executor.spawn_critical(
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"this is a critical task",
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Box::pin(async { panic!("intentionally panic") }),
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);
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runtime.block_on(async move {
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let err = manager.await;
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assert_eq!(err.task_name, "this is a critical task");
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assert_eq!(err.error, Some("intentionally panic".to_string()));
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})
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}
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|
|
// Tests that spawned tasks are terminated if the `TaskManager` drops
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#[test]
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|
fn test_manager_shutdown_critical() {
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let runtime = tokio::runtime::Runtime::new().unwrap();
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let handle = runtime.handle().clone();
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let manager = TaskManager::new(handle.clone());
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let executor = manager.executor();
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let (signal, shutdown) = signal();
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executor.spawn_critical(
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"this is a critical task",
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Box::pin(async move {
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tokio::time::sleep(Duration::from_millis(200)).await;
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drop(signal);
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}),
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);
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drop(manager);
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handle.block_on(shutdown);
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}
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|
|
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// Tests that spawned tasks are terminated if the `TaskManager` drops
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|
#[test]
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|
fn test_manager_shutdown() {
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let runtime = tokio::runtime::Runtime::new().unwrap();
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let handle = runtime.handle().clone();
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let manager = TaskManager::new(handle.clone());
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let executor = manager.executor();
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let (signal, shutdown) = signal();
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executor.spawn(Box::pin(async move {
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|
tokio::time::sleep(Duration::from_millis(200)).await;
|
|
drop(signal);
|
|
}));
|
|
|
|
drop(manager);
|
|
|
|
handle.block_on(shutdown);
|
|
}
|
|
}
|