refactor: trim some dead code, simplify auth

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
-name = "zenith-builder-example"
+name = "builder"
 version = "0.1.1"
-description = "Zenith Builder Example"
+description = "signet builder example"
 
 edition = "2024"
 rust-version = "1.85"

bin/builder.rs

@@ -1,27 +1,27 @@
 use builder::{
     config::BuilderConfig,
-    service::serve_builder_with_span,
+    service::serve_builder,
     tasks::{
         block::Simulator, bundler, metrics::MetricsTask, oauth::Authenticator, submit::SubmitTask,
         tx_poller,
     },
 };
+use init4_bin_base::{deps::tracing, utils::calc::SlotCalculator};
 use signet_sim::SimCache;
-use signet_types::SlotCalculator;
 use std::sync::Arc;
 use tokio::select;
+use tracing::info_span;
 
 // Note: Must be set to `multi_thread` to support async tasks.
 // See: https://docs.rs/tokio/latest/tokio/attr.main.html
 #[tokio::main(flavor = "multi_thread")]
 async fn main() -> eyre::Result<()> {
     let _guard = init4_bin_base::init4();
-
-    let span = tracing::info_span!("zenith-builder");
+    let init_span_guard = info_span!("builder initialization");
 
     let config = BuilderConfig::load_from_env()?.clone();
     let constants = config.load_pecorino_constants();
-    let authenticator = Authenticator::new(&config);
+    let authenticator = Authenticator::new(&config)?;
 
     let (host_provider, ru_provider, sequencer_signer) = tokio::try_join!(
         config.connect_host_provider(),
@@ -35,7 +35,7 @@ async fn main() -> eyre::Result<()> {
     let (tx_channel, metrics_jh) = metrics.spawn();
 
     let submit = SubmitTask {
-        authenticator: authenticator.clone(),
+        token: authenticator.token(),
         host_provider,
         zenith,
         client: reqwest::Client::new(),
@@ -47,7 +47,7 @@ async fn main() -> eyre::Result<()> {
     let tx_poller = tx_poller::TxPoller::new(&config);
     let (tx_receiver, tx_poller_jh) = tx_poller.spawn();
 
-    let bundle_poller = bundler::BundlePoller::new(&config, authenticator.clone());
+    let bundle_poller = bundler::BundlePoller::new(&config, authenticator.token());
     let (bundle_receiver, bundle_poller_jh) = bundle_poller.spawn();
 
     let authenticator_jh = authenticator.spawn();
@@ -65,8 +65,11 @@ async fn main() -> eyre::Result<()> {
 
     let build_jh = sim.clone().spawn_simulator_task(constants, sim_items.clone(), submit_channel);
 
-    let port = config.builder_port;
-    let server = serve_builder_with_span(([0, 0, 0, 0], port), span);
+    let server = serve_builder(([0, 0, 0, 0], config.builder_port));
+
+    // We have finished initializing the builder, so we can drop the init span
+    // guard.
+    drop(init_span_guard);
 
     select! {
         _ = tx_poller_jh => {

src/service.rs

@@ -1,48 +1,10 @@
-use std::{fmt::Debug, net::SocketAddr};
-
 use axum::{
     Router,
     http::StatusCode,
     response::{IntoResponse, Response},
     routing::get,
 };
-use tracing::{Instrument, Span};
-
-/// App result
-pub type AppResult<T, E = AppError> = Result<T, E>;
-
-/// App error. This is a wrapper around eyre::Report that also includes an HTTP
-/// status code. It implements [`IntoResponse`] so that it can be returned as an
-/// error type from [`axum::handler::Handler`]s.
-#[derive(Debug)]
-pub struct AppError {
-    code: StatusCode,
-    eyre: eyre::Report,
-}
-
-impl AppError {
-    /// Instantiate a new error with the bad request status code.
-    pub fn bad_req<E: std::error::Error + Send + Sync + 'static>(e: E) -> Self {
-        Self { code: StatusCode::BAD_REQUEST, eyre: e.into() }
-    }
-
-    /// Instantiate a new error with the bad request status code and an error
-    /// string.
-    pub fn bad_req_str(e: &str) -> Self {
-        Self { code: StatusCode::BAD_REQUEST, eyre: eyre::eyre!(e.to_owned()) }
-    }
-
-    /// Instantiate a new error with the internal server error status code.
-    pub fn server_err<E: std::error::Error + Send + Sync + 'static>(e: E) -> Self {
-        Self { code: StatusCode::INTERNAL_SERVER_ERROR, eyre: e.into() }
-    }
-}
-
-impl IntoResponse for AppError {
-    fn into_response(self) -> Response {
-        (self.code, format!("{}", self.eyre)).into_response()
-    }
-}
+use std::net::SocketAddr;
 
 /// Return a 404 Not Found response
 pub async fn return_404() -> Response {
@@ -55,26 +17,20 @@ pub async fn return_200() -> Response {
 }
 
 /// Serve a builder service on the given socket address.
-pub fn serve_builder_with_span(
-    socket: impl Into<SocketAddr>,
-    span: Span,
-) -> tokio::task::JoinHandle<()> {
+pub fn serve_builder(socket: impl Into<SocketAddr>) -> tokio::task::JoinHandle<()> {
     let router = Router::new().route("/healthcheck", get(return_200)).fallback(return_404);
 
     let addr = socket.into();
-    tokio::spawn(
-        async move {
-            match tokio::net::TcpListener::bind(&addr).await {
-                Ok(listener) => {
-                    if let Err(err) = axum::serve(listener, router).await {
-                        tracing::error!(%err, "serve failed");
-                    }
-                }
-                Err(err) => {
-                    tracing::error!(%err, "failed to bind to the address");
+    tokio::spawn(async move {
+        match tokio::net::TcpListener::bind(&addr).await {
+            Ok(listener) => {
+                if let Err(err) = axum::serve(listener, router).await {
+                    tracing::error!(%err, "serve failed");
                 }
-            };
-        }
-        .instrument(span),
-    )
+            }
+            Err(err) => {
+                tracing::error!(%err, "failed to bind to the address");
+            }
+        };
+    })
 }

src/tasks/block.rs

@@ -15,8 +15,9 @@ use alloy::{
 };
 use chrono::{DateTime, Utc};
 use eyre::Report;
+use init4_bin_base::utils::calc::SlotCalculator;
 use signet_sim::{BlockBuild, BuiltBlock, SimCache};
-use signet_types::{SlotCalculator, config::SignetSystemConstants};
+use signet_types::config::SignetSystemConstants;
 use std::{
     sync::{
         Arc,
@@ -210,7 +211,7 @@ impl Simulator {
         }
     }
 
-    /// Spawns the simulator task, which handles the setup and sets the deadline  
+    /// Spawns the simulator task, which handles the setup and sets the deadline
     /// for the each round of simulation.
     ///
     /// # Arguments

src/tasks/bundler.rs

@@ -1,14 +1,16 @@
 //! Bundler service responsible for fetching bundles and sending them to the simulator.
-pub use crate::config::BuilderConfig;
-use crate::tasks::oauth::Authenticator;
+use crate::tasks::oauth::SharedToken;
 use oauth2::TokenResponse;
 use reqwest::{Client, Url};
 use serde::{Deserialize, Serialize};
 use signet_bundle::SignetEthBundle;
 use tokio::sync::mpsc::{UnboundedReceiver, UnboundedSender, unbounded_channel};
 use tokio::task::JoinHandle;
 use tokio::time;
-use tracing::{Instrument, debug, trace};
+use tracing::{Instrument, debug, trace, warn};
+
+pub use crate::config::BuilderConfig;
+
 /// Holds a bundle from the cache with a unique ID and a Zenith bundle.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Bundle {
@@ -26,12 +28,12 @@ pub struct TxPoolBundleResponse {
 }
 
 /// The BundlePoller polls the tx-pool for bundles.
-#[derive(Debug, Clone)]
+#[derive(Debug)]
 pub struct BundlePoller {
     /// The builder configuration values.
     pub config: BuilderConfig,
     /// Authentication module that periodically fetches and stores auth tokens.
-    pub authenticator: Authenticator,
+    pub token: SharedToken,
     /// Holds a Reqwest client
     pub client: Client,
     /// Defines the interval at which the bundler polls the tx-pool for bundles.
@@ -41,28 +43,26 @@ pub struct BundlePoller {
 /// Implements a poller for the block builder to pull bundles from the tx-pool.
 impl BundlePoller {
     /// Creates a new BundlePoller from the provided builder config.
-    pub fn new(config: &BuilderConfig, authenticator: Authenticator) -> Self {
-        Self {
-            config: config.clone(),
-            authenticator,
-            client: Client::new(),
-            poll_interval_ms: 1000,
-        }
+    pub fn new(config: &BuilderConfig, token: SharedToken) -> Self {
+        Self { config: config.clone(), token, client: Client::new(), poll_interval_ms: 1000 }
     }
 
     /// Creates a new BundlePoller from the provided builder config and with the specified poll interval in ms.
     pub fn new_with_poll_interval_ms(
         config: &BuilderConfig,
-        authenticator: Authenticator,
+        token: SharedToken,
         poll_interval_ms: u64,
     ) -> Self {
-        Self { config: config.clone(), authenticator, client: Client::new(), poll_interval_ms }
+        Self { config: config.clone(), token, client: Client::new(), poll_interval_ms }
     }
 
     /// Fetches bundles from the transaction cache and returns them.
     pub async fn check_bundle_cache(&mut self) -> eyre::Result<Vec<Bundle>> {
         let bundle_url: Url = Url::parse(&self.config.tx_pool_url)?.join("bundles")?;
-        let token = self.authenticator.fetch_oauth_token().await?;
+        let Some(token) = self.token.read() else {
+            warn!("No token available, skipping bundle fetch");
+            return Ok(vec![]);
+        };
 
         let result = self
             .client