feat(exex): subscribe to notifications explicitly

book/developers/exex/hello-world.md

@@ -24,7 +24,9 @@ reth = { git = "https://github.com/paradigmxyz/reth.git" } # Reth
 reth-exex = { git = "https://github.com/paradigmxyz/reth.git" } # Execution Extensions
 reth-node-ethereum = { git = "https://github.com/paradigmxyz/reth.git" } # Ethereum Node implementation
 reth-tracing = { git = "https://github.com/paradigmxyz/reth.git" } # Logging
+
 eyre = "0.6" # Easy error handling
+futures-util = "0.3" # Stream utilities for consuming notifications
 ```
 
 ### Default Reth node
@@ -101,13 +103,14 @@ If you try running a node with an ExEx that exits, the node will exit as well.
 Now, let's extend our simplest ExEx and start actually listening to new notifications, log them, and send events back to the main node
 
 ```rust,norun,noplayground,ignore
+use futures_util::StreamExt;
 use reth::api::FullNodeComponents;
 use reth_exex::{ExExContext, ExExEvent, ExExNotification};
 use reth_node_ethereum::EthereumNode;
 use reth_tracing::tracing::info;
 
 async fn my_exex<Node: FullNodeComponents>(mut ctx: ExExContext<Node>) -> eyre::Result<()> {
-    while let Some(notification) = ctx.notifications.recv().await {
+    while let Some(notification) = ctx.notifications.next().await {
         match &notification {
             ExExNotification::ChainCommitted { new } => {
                 info!(committed_chain = ?new.range(), "Received commit");

book/developers/exex/remote.md

@@ -268,13 +268,15 @@ Don't forget to emit `ExExEvent::FinishedHeight`
 
 ```rust,norun,noplayground,ignore
 // ...
+
+use futures_util::StreamExt;
 use reth_exex::{ExExContext, ExExEvent};
 
 async fn remote_exex<Node: FullNodeComponents>(
     mut ctx: ExExContext<Node>,
     notifications: Arc<broadcast::Sender<ExExNotification>>,
 ) -> eyre::Result<()> {
-    while let Some(notification) = ctx.notifications.recv().await {
+    while let Some(notification) = ctx.notifications.next().await {
         if let Some(committed_chain) = notification.committed_chain() {
             ctx.events
                 .send(ExExEvent::FinishedHeight(committed_chain.tip().number))?;
@@ -332,6 +334,9 @@ fn main() -> eyre::Result<()> {
 <summary>Click to expand</summary>
 
 ```rust,norun,noplayground,ignore
+use std::sync::Arc;
+
+use futures_util::StreamExt;
 use remote_exex::proto::{
     self,
     remote_ex_ex_server::{RemoteExEx, RemoteExExServer},
@@ -340,7 +345,6 @@ use reth::api::FullNodeComponents;
 use reth_exex::{ExExContext, ExExEvent, ExExNotification};
 use reth_node_ethereum::EthereumNode;
 use reth_tracing::tracing::info;
-use std::sync::Arc;
 use tokio::sync::{broadcast, mpsc};
 use tokio_stream::wrappers::ReceiverStream;
 use tonic::{transport::Server, Request, Response, Status};
@@ -381,7 +385,7 @@ async fn remote_exex<Node: FullNodeComponents>(
     mut ctx: ExExContext<Node>,
     notifications: Arc<broadcast::Sender<ExExNotification>>,
 ) -> eyre::Result<()> {
-    while let Some(notification) = ctx.notifications.recv().await {
+    while let Some(notification) = ctx.notifications.next().await {
         if let Some(committed_chain) = notification.committed_chain() {
             ctx.events
                 .send(ExExEvent::FinishedHeight(committed_chain.tip().number))?;

book/developers/exex/tracking-state.md

@@ -25,6 +25,7 @@ use std::{
     task::{ready, Context, Poll},
 };
 
+use futures_util::StreamExt;
 use reth::api::FullNodeComponents;
 use reth_exex::{ExExContext, ExExEvent, ExExNotification};
 use reth_node_ethereum::EthereumNode;
@@ -40,7 +41,7 @@ impl<Node: FullNodeComponents> Future for MyExEx<Node> {
     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
         let this = self.get_mut();
 
-        while let Some(notification) = ready!(this.ctx.notifications.poll_recv(cx)) {
+        while let Some(notification) = ready!(this.ctx.notifications.poll_next_unpin(cx)) {
             match &notification {
                 ExExNotification::ChainCommitted { new } => {
                     info!(committed_chain = ?new.range(), "Received commit");
@@ -101,6 +102,7 @@ use std::{
     task::{ready, Context, Poll},
 };
 
+use futures_util::StreamExt;
 use reth::{api::FullNodeComponents, primitives::BlockNumber};
 use reth_exex::{ExExContext, ExExEvent};
 use reth_node_ethereum::EthereumNode;
@@ -130,7 +132,7 @@ impl<Node: FullNodeComponents> Future for MyExEx<Node> {
     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
         let this = self.get_mut();
 
-        while let Some(notification) = ready!(this.ctx.notifications.poll_recv(cx)) {
+        while let Some(notification) = ready!(this.ctx.notifications.poll_next_unpin(cx)) {
             if let Some(reverted_chain) = notification.reverted_chain() {
                 this.transactions = this.transactions.saturating_sub(
                     reverted_chain

book/installation/source.md

@@ -8,7 +8,7 @@ You can build Reth on Linux, macOS, Windows, and Windows WSL2.
 
 ## Dependencies
 
-First, **install Rust** using [rustup](https://rustup.rs/)：
+First, **install Rust** using [rustup](https://rustup.rs/)： 
 
 ```bash
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
@@ -32,7 +32,7 @@ operating system:
 
 These are needed to build bindings for Reth's database.
 
-The Minimum Supported Rust Version (MSRV) of this project is 1.81.0. If you already have a version of Rust installed,
+The Minimum Supported Rust Version (MSRV) of this project is 1.80.0. If you already have a version of Rust installed,
 you can check your version by running `rustc --version`. To update your version of Rust, run `rustup update`.
 
 ## Build Reth
@@ -147,7 +147,7 @@ _(Thanks to Sigma Prime for this section from [their Lighthouse book](https://li
 
 ### Bus error (WSL2)
 
-In WSL 2 on Windows, the default virtual disk size is set to 1TB.
+In WSL 2 on Windows, the default virtual disk size is set to 1TB. 
 
 You must increase the allocated disk size for your WSL2 instance before syncing reth.
 

crates/exex/exex/Cargo.toml

@@ -20,8 +20,8 @@ reth-metrics.workspace = true
 reth-node-api.workspace = true
 reth-node-core.workspace = true
 reth-payload-builder.workspace = true
-reth-primitives-traits.workspace = true
 reth-primitives = { workspace = true, features = ["secp256k1"] }
+reth-primitives-traits.workspace = true
 reth-provider.workspace = true
 reth-prune-types.workspace = true
 reth-revm.workspace = true
@@ -45,9 +45,9 @@ reth-db-api.workspace = true
 reth-db-common.workspace = true
 reth-evm-ethereum.workspace = true
 reth-node-api.workspace = true
+reth-primitives-traits = { workspace = true, features = ["test-utils"] }
 reth-provider = { workspace = true, features = ["test-utils"] }
 reth-testing-utils.workspace = true
-reth-primitives-traits = { workspace = true, features = ["test-utils"] }
 
 secp256k1.workspace = true
 

crates/exex/exex/src/context.rs

@@ -4,9 +4,9 @@ use reth_node_api::{FullNodeComponents, NodeTypesWithEngine};
 use reth_node_core::node_config::NodeConfig;
 use reth_primitives::Head;
 use reth_tasks::TaskExecutor;
-use tokio::sync::mpsc::{Receiver, UnboundedSender};
+use tokio::sync::mpsc::UnboundedSender;
 
-use crate::{ExExEvent, ExExNotification};
+use crate::{ExExEvent, ExExNotifications};
 
 /// Captures the context that an `ExEx` has access to.
 pub struct ExExContext<Node: FullNodeComponents> {
@@ -24,13 +24,13 @@ pub struct ExExContext<Node: FullNodeComponents> {
     /// Additionally, the exex can pre-emptively emit a `FinishedHeight` event to specify what
     /// blocks to receive notifications for.
     pub events: UnboundedSender<ExExEvent>,
-    /// Channel to receive [`ExExNotification`]s.
+    /// Channel to receive [`ExExNotification`](crate::ExExNotification)s.
     ///
     /// # Important
     ///
-    /// Once a an [`ExExNotification`] is sent over the channel, it is considered delivered by the
-    /// node.
-    pub notifications: Receiver<ExExNotification>,
+    /// Once an [`ExExNotification`](crate::ExExNotification) is sent over the channel, it is
+    /// considered delivered by the node.
+    pub notifications: ExExNotifications<Node>,
 
     /// node components
     pub components: Node,