chore: removes bin-base flashbots dependency (#160)

chore: removes bin-base flashbots dependency

Removes the `bin-base`​ implementation of `flashbots`​ in favor of `alloy`​.

Related to [ENG-1415](https://linear.app/initiates/issue/ENG-1415/remove-the-bin-base-implementation-of-flashbots)

Author: dylanlott

Cargo.lock

@@ -18,7 +18,7 @@ name = "zenith-builder-example"
 path = "bin/builder.rs"
 
 [dependencies]
-init4-bin-base = { version = "0.13.1", features = ["perms", "aws", "flashbots"] }
+init4-bin-base = { version = "0.13.1", features = ["perms", "aws" ] }
 
 signet-constants = { version = "0.11.2" }
 signet-sim = { version = "0.11.2" }

Cargo.toml

@@ -21,7 +21,6 @@ use init4_bin_base::{
     perms::{Authenticator, OAuthConfig, SharedToken},
     utils::{
         calc::SlotCalculator,
-        flashbots::Flashbots,
         from_env::FromEnv,
         provider::{ProviderConfig, PubSubConfig},
         signer::LocalOrAws,
@@ -110,8 +109,17 @@ pub struct BuilderConfig {
     )]
     pub tx_broadcast_urls: Vec<Cow<'static, str>>,
 
-    /// Flashbots configuration for privately submitting rollup blocks.
-    pub flashbots: init4_bin_base::utils::flashbots::FlashbotsConfig,
+    /// Configuration for the Flashbots provider.
+    /// * If set, the builder will submit blocks as MEV bundles to Flashbots instead of
+    ///   submitting them directly to the Host chain.
+    /// * If not set, the builder defaults to submitting blocks directly to the Host chain
+    ///   using the Builder Helper contract.
+    #[from_env(
+        var = "FLASHBOTS_ENDPOINT",
+        desc = "Flashbots endpoint for privately submitting rollup blocks",
+        optional
+    )]
+    pub flashbots_endpoint: Option<url::Url>,
 
     /// Address of the Zenith contract on Host.
     #[from_env(var = "ZENITH_ADDRESS", desc = "address of the Zenith contract on Host")]
@@ -236,16 +244,13 @@ impl BuilderConfig {
             .connect_provider(provider?))
     }
 
-    /// Connect to a Flashbots bundle provider
+    /// Connect to a Flashbots bundle provider.
     pub async fn connect_flashbots(
         &self,
         config: &BuilderConfig,
     ) -> Result<FlashbotsProvider, eyre::Error> {
-        let endpoint = config
-            .flashbots
-            .flashbots_endpoint
-            .clone()
-            .expect("flashbots endpoint must be configured");
+        let endpoint =
+            config.flashbots_endpoint.clone().expect("flashbots endpoint must be configured");
         let signer = config.connect_builder_signer().await?;
         let flashbots: FlashbotsProvider =
             ProviderBuilder::new().wallet(signer).connect_http(endpoint);
@@ -318,20 +323,13 @@ impl BuilderConfig {
         })
     }
 
-    /// Connect to a Flashbots provider.
-    pub async fn flashbots_provider(&self) -> eyre::Result<Flashbots> {
-        self.flashbots
-            .build(self.connect_builder_signer().await?)
-            .ok_or_else(|| eyre::eyre!("Flashbots is not configured"))
-    }
-
     /// Spawn a submit task, either Flashbots or BuilderHelper depending on
     /// configuration.
     pub async fn spawn_submit_task(
         &self,
         tx_channel: UnboundedSender<TxHash>,
     ) -> eyre::Result<(UnboundedSender<SimResult>, JoinHandle<()>)> {
-        match &self.flashbots.flashbots_endpoint {
+        match &self.flashbots_endpoint {
             Some(url) => {
                 info!(url = url.as_str(), "spawning flashbots submit task");
                 let submit = FlashbotsTask::new(self.clone(), tx_channel).await?;

src/config.rs

@@ -12,7 +12,7 @@ use init4_bin_base::{
         EnvFilter, Layer, fmt, layer::SubscriberExt, registry, util::SubscriberInitExt,
     },
     perms::OAuthConfig,
-    utils::{calc::SlotCalculator, flashbots::FlashbotsConfig, provider::ProviderConfig},
+    utils::{calc::SlotCalculator, provider::ProviderConfig},
 };
 use signet_constants::SignetSystemConstants;
 use std::env;
@@ -35,9 +35,7 @@ pub fn setup_test_config() -> Result<BuilderConfig> {
             .try_into()
             .unwrap(),
         tx_broadcast_urls: vec!["http://localhost:9000".into()],
-        flashbots: FlashbotsConfig {
-            flashbots_endpoint: Some("https://relay-sepolia.flashbots.net:443".parse().unwrap()),
-        }, // NB: Flashbots API default
+        flashbots_endpoint: Some("https://relay-sepolia.flashbots.net:443".parse().unwrap()),
         zenith_address: Address::default(),
         quincey_url: "http://localhost:8080".into(),
         sequencer_key: None,