chore(sidecar): review CLI options and their defaults

bolt-sidecar/src/config/chain.rs

@@ -1,4 +1,5 @@
-use std::time::Duration;
+use core::fmt;
+use std::{fmt::Display, time::Duration};
 
 use clap::{Args, ValueEnum};
 use ethereum_consensus::deneb::{compute_fork_data_root, Root};
@@ -25,7 +26,7 @@ pub const COMMIT_BOOST_DOMAIN_MASK: [u8; 4] = [109, 109, 111, 67];
 #[derive(Debug, Clone, Copy, Args, Deserialize)]
 pub struct ChainConfig {
     /// Chain on which the sidecar is running
-    #[clap(long, env = "BOLT_SIDECAR_CHAIN", default_value = "mainnet")]
+    #[clap(long, env = "BOLT_SIDECAR_CHAIN", default_value_t = Chain::Mainnet)]
     chain: Chain,
     /// The deadline in the slot at which the sidecar will stop accepting
     /// new commitments for the next block (parsed as milliseconds).
@@ -65,6 +66,24 @@ pub enum Chain {
     Kurtosis,
 }
 
+impl Chain {
+    /// Get the chain name for the given chain.
+    pub fn name(&self) -> &'static str {
+        match self {
+            Chain::Mainnet => "mainnet",
+            Chain::Holesky => "holesky",
+            Chain::Helder => "helder",
+            Chain::Kurtosis => "kurtosis",
+        }
+    }
+}
+
+impl Display for Chain {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.name())
+    }
+}
+
 impl ChainConfig {
     /// Get the chain ID for the given chain.
     pub fn chain_id(&self) -> u64 {
@@ -78,12 +97,7 @@ impl ChainConfig {
 
     /// Get the chain name for the given chain.
     pub fn name(&self) -> &'static str {
-        match self.chain {
-            Chain::Mainnet => "mainnet",
-            Chain::Holesky => "holesky",
-            Chain::Helder => "helder",
-            Chain::Kurtosis => "kurtosis",
-        }
+        self.chain.name()
     }
 
     /// Get the slot time for the given chain in seconds.

bolt-sidecar/src/config/mod.rs

@@ -23,11 +23,13 @@ use limits::LimitsOpts;
 
 use crate::common::{BlsSecretKeyWrapper, EcdsaSecretKeyWrapper, JwtSecretConfig};
 
-/// Default port for the JSON-RPC server exposed by the sidecar.
-pub const DEFAULT_RPC_PORT: u16 = 8000;
+/// Default port for the JSON-RPC server exposed by the sidecar supporting the Commitments API.
+///
+/// 8017 -> BOLT :)
+pub const DEFAULT_RPC_PORT: u16 = 8017;
 
-/// Default port for the Constraints proxy server.
-pub const DEFAULT_CONSTRAINTS_PROXY_PORT: u16 = 18551;
+/// Default port for the Constraints proxy server, binded to the default port used by MEV-Boost.
+pub const DEFAULT_CONSTRAINTS_PROXY_PORT: u16 = 18550;
 
 /// Command-line options for the Bolt sidecar
 #[derive(Debug, Parser, Deserialize)]
@@ -52,7 +54,7 @@ pub struct Opts {
     #[clap(
         long,
         env = "BOLT_SIDECAR_CONSTRAINTS_API_URL",
-        default_value = "http://localhost:3030"
+        default_value = "http://localhost:18551"
     )]
     pub constraints_api_url: Url,
     /// The port from which the Bolt sidecar will receive Builder-API requests from the
@@ -68,7 +70,7 @@ pub struct Opts {
     /// - a comma-separated list of indexes (e.g. "1,2,3,4")
     /// - a contiguous range of indexes (e.g. "1..4")
     /// - a mix of the above (e.g. "1,2..4,6..8")
-    #[clap(long, env = "BOLT_SIDECAR_VALIDATOR_INDEXES", default_value_t)]
+    #[clap(long, env = "BOLT_SIDECAR_VALIDATOR_INDEXES")]
     pub validator_indexes: ValidatorIndexes,
     /// The JWT secret token to authenticate calls to the engine API.
     ///