Allow the relayer to operate on a subset of chains (#1545)

rust/agents/relayer/src/relayer.rs

@@ -55,7 +55,15 @@ impl BaseAgent for Relayer {
     where
         Self: Sized,
     {
-        let core = settings.try_into_hyperlane_core(metrics, None).await?;
+        let core = if let Some(ref remotes) = settings.destinationchainnames {
+            let mut v: Vec<&str> = remotes.split(',').collect();
+            v.push(&settings.originchainname);
+            settings
+                .try_into_hyperlane_core(metrics, Some(v.clone()))
+                .await?
+        } else {
+            settings.try_into_hyperlane_core(metrics, None).await?
+        };
 
         let multisig_checkpoint_syncer: MultisigCheckpointSyncer = settings
             .multisigcheckpointsyncer

rust/agents/relayer/src/settings/mod.rs

@@ -24,6 +24,9 @@ pub enum GasPaymentEnforcementPolicy {
 decl_settings!(Relayer {
     // The name of the origin chain
     originchainname: String,
+    // Optional list of destination chains. If none are provided, ALL chains in chain_setup
+    // will be used, excluding the origin chain.
+    destinationchainnames: Option<String>,
     /// The multisig checkpoint syncer configuration
     multisigcheckpointsyncer: hyperlane_base::MultisigCheckpointSyncerConf,
     /// The gas payment enforcement policy configuration

rust/chains/hyperlane-ethereum/src/multisig_ism.rs

@@ -8,6 +8,7 @@ use async_trait::async_trait;
 use ethers::abi::Token;
 use ethers::providers::Middleware;
 use ethers::types::Selector;
+use tracing::instrument;
 
 use hyperlane_core::accumulator::merkle::Proof;
 use hyperlane_core::{
@@ -90,6 +91,7 @@ impl<M> MultisigIsm for EthereumMultisigIsm<M>
 where
     M: Middleware + 'static,
 {
+    #[instrument(err, ret)]
     async fn validators_and_threshold(
         &self,
         message: &HyperlaneMessage,

rust/utils/run-locally/src/main.rs

@@ -160,6 +160,7 @@ fn main() -> ExitCode {
         "HYP_BASE_SIGNERS_TEST3_TYPE" => "hexKey",
         "HYP_RELAYER_GASPAYMENTENFORCEMENTPOLICY_TYPE" => "none",
         "HYP_RELAYER_ORIGINCHAINNAME" => "test1",
+        "HYP_RELAYER_DESTINATIONCHAINNAMES" => "test2,test3",
         "HYP_RELAYER_WHITELIST" => r#"[{"sourceAddress": "*", "destinationDomain": ["13372", "13373"], "destinationAddress": "*"}]"#,
         "HYP_RELAYER_MULTISIGCHECKPOINTSYNCER_CHECKPOINTSYNCERS_0x70997970c51812dc3a010c7d01b50e0d17dc79c8_TYPE" => "localStorage",
         "HYP_RELAYER_MULTISIGCHECKPOINTSYNCER_CHECKPOINTSYNCERS_0x70997970c51812dc3a010c7d01b50e0d17dc79c8_PATH" => checkpoints_dir.path().to_str().unwrap(),