feat: check if validator participating in fastlane

Cargo.toml

@@ -72,6 +72,7 @@ expanded-pathbuf = "0.1.2"
 eyre = "0.6.11"
 jsonrpsee = { version = "0.21.0", features = ["server", "macros", "client"] }
 metrics = "0.22.0"
+reqwest = { version = "0.11.4", features = ["json"] }
 lazy_static = "1.4.0"
 serde = "1.0.193"
 serde_json = "1.0.109"

bin/silius/src/bundler.rs

@@ -25,7 +25,7 @@ use silius_primitives::{
     bundler::BundleStrategy,
     constants::{
         entry_point,
-        fastlane_relay_endpoints::FASTLANE_POLYGON,
+        fastlane_relay_endpoints::{FASTLANE_POLYGON, POLYGON_NODE},
         flashbots_relay_endpoints,
         storage::DATABASE_FOLDER_NAME,
         supported_chains::CHAINS,
@@ -241,15 +241,21 @@ where
         }
         BundleStrategy::Fastlane => {
             let relay_endpoint: String =
-                match chain_conn.named().expect("Fastlane is only supported on Polygon") {
+                match chain_conn.named().expect("Fastlane is only supported on Polygon mainnet") {
                     NamedChain::Polygon => FASTLANE_POLYGON.into(),
-                    _ => panic!("Fastlane is only supported on Polygon"),
+                    _ => panic!("Fastlane is only supported on Polygon mainnet"),
                 };
 
             let relay_client =
                 create_http_provider(&relay_endpoint, Duration::from_millis(75)).await?;
-            let client =
-                Arc::new(FastlaneClient::new(eth_client.clone(), relay_client, wallet.clone()));
+            let polygon_client =
+                create_http_provider(POLYGON_NODE, Duration::from_millis(75)).await?;
+            let client = Arc::new(FastlaneClient::new(
+                eth_client.clone(),
+                polygon_client,
+                relay_client,
+                wallet.clone(),
+            ));
 
             bundler_service_run(
                 SocketAddr::new(args.bundler_addr, args.bundler_port),

crates/bundler/Cargo.toml

@@ -30,6 +30,7 @@ tokio = { workspace = true }
 # misc
 bytes = "1.5.0"
 eyre = { workspace = true }
+reqwest = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 tracing = { workspace = true }
 url = "2.5.0"

crates/bundler/src/fastlane.rs

@@ -11,17 +11,27 @@ use ethers::{
         Address, BlockNumber, H256,
     },
 };
-use silius_primitives::{simulation::StorageMap, Wallet};
+use serde::Deserialize;
+use silius_primitives::{
+    constants::fastlane_relay_endpoints::FASTLANE_VALIDATORS, simulation::StorageMap, Wallet,
+};
 use std::{collections::HashMap, sync::Arc};
 use tracing::trace;
 
 /// A type alias for the Ethereum Conditional Signer client
 #[derive(Clone)]
 pub struct FastlaneClient<M> {
     pub client: SignerMiddleware<Arc<M>, LocalWallet>,
+    pub polygon_client: Provider<Http>,
     pub relay_client: Provider<Http>,
 }
 
+/// Validators participating in the Fastlane relay network
+#[derive(Deserialize, Debug)]
+pub struct FastlaneValidators {
+    validators: Vec<Address>,
+}
+
 #[async_trait::async_trait]
 impl<M> SendBundleOp for FastlaneClient<M>
 where
@@ -65,6 +75,19 @@ where
             options.timestamp_max = Some(block.timestamp.as_u64() + 420); // around 15 minutes
         }
 
+        // check if the current validator is participating in the Fastlane protocol
+        let fastlane_validators =
+            reqwest::get(FASTLANE_VALIDATORS).await?.json::<FastlaneValidators>().await?;
+        let current_validator: Address =
+            self.polygon_client.request("bor_getCurrentProposer", ()).await?;
+
+        if !fastlane_validators.validators.contains(&current_validator) {
+            trace!("Current validator is not participating in the Fastlane protocol");
+            return Err(eyre::eyre!(
+                "Current validator is not participating in the Fastlane protocol"
+            ));
+        }
+
         let tx =
             self.relay_client.send_raw_transaction_conditional(signed_tx, prefix, options).await?;
         let tx_hash = tx.tx_hash();
@@ -85,13 +108,19 @@ where
     ///
     /// # Arguments
     /// * `eth_client` - Connection to the Ethereum execution client
+    /// * `polygon_client` - Connection to the Polygon execution client
     /// * `relay_client` - Connection to the Fastlane relay client
     /// * `wallet` - A [Wallet](Wallet) instance
     ///
     /// # Returns
     /// * `ConditionalClient` - A [Ethereum Signer Middleware](ConditionalClient)
-    pub fn new(eth_client: Arc<M>, relay_client: Provider<Http>, wallet: Wallet) -> Self {
+    pub fn new(
+        eth_client: Arc<M>,
+        polygon_client: Provider<Http>,
+        relay_client: Provider<Http>,
+        wallet: Wallet,
+    ) -> Self {
         let signer = SignerMiddleware::new(eth_client, wallet.clone().signer);
-        Self { client: signer, relay_client }
+        Self { client: signer, polygon_client, relay_client }
     }
 }

crates/p2p/Cargo.toml

@@ -48,7 +48,7 @@ futures-bounded = "0.2.3"
 parking_lot = { workspace = true }
 
 # rpc
-reqwest = { version = "0.11.4" }
+reqwest = { workspace = true }
 
 # tokio
 tokio = { workspace = true }

crates/primitives/src/constants.rs

@@ -86,6 +86,8 @@ pub mod flashbots_relay_endpoints {
 pub mod fastlane_relay_endpoints {
     // polygon
     pub const FASTLANE_POLYGON: &str = "https://polygon-rpc.fastlane.xyz/";
+    pub const FASTLANE_VALIDATORS: &str = "https://www.fastlane.xyz/api/4337";
+    pub const POLYGON_NODE: &str = "https://polygon-rpc.com";
 }
 
 /// Supported chains

examples/simple-account/Cargo.toml

@@ -23,7 +23,7 @@ alloy-sol-types = "0.5.4"
 ethers = { workspace = true }
 
 # rpc
-reqwest = { version = "0.11.4", features = ["json"] }
+reqwest = { workspace = true }
 
 # tokio
 tokio = { workspace = true }