feat: Add the ability to read the cl_node_urls from env variables

config-live-example.toml

@@ -8,7 +8,9 @@ reth_datadir = "/mnt/data/reth"
 
 coinbase_secret_key = "env:COINBASE_SECRET_KEY"
 
-cl_node_url = ["http://localhost:3500"]
+#cl_node_url can be a single value, array of values, or passed by an environment variables with values separated with a comma
+#cl_node_url = "http://localhost:3500"
+cl_node_url = ["env:CL_NODE_URL"]
 jsonrpc_server_port = 8645
 jsonrpc_server_ip = "0.0.0.0"
 el_node_ipc_path = "/tmp/reth.ipc"

crates/rbuilder/src/live_builder/base_config.rs

@@ -29,7 +29,7 @@ use reth::{
 use reth_db::DatabaseEnv;
 use reth_primitives::format_ether;
 use serde::Deserialize;
-use serde_with::{serde_as, OneOrMany};
+use serde_with::{serde_as, DisplayFromStr, OneOrMany};
 use sqlx::PgPool;
 use std::{
     env::var,
@@ -66,7 +66,7 @@ pub struct BaseConfig {
 
     pub el_node_ipc_path: PathBuf,
     ///Name kept singular for backwards compatibility
-    #[serde_as(deserialize_as = "OneOrMany<_>")]
+    #[serde(deserialize_with = "deserialize_cl_url")]
     pub cl_node_url: Vec<String>,
     pub jsonrpc_server_port: u16,
     pub jsonrpc_server_ip: Option<String>,
@@ -131,6 +131,25 @@ lazy_static! {
     pub static ref DEFAULT_IP: Ipv4Addr = Ipv4Addr::new(0, 0, 0, 0);
 }
 
+fn deserialize_cl_url<'de, D>(deserializer: D) -> Result<Vec<String>, D::Error>
+where
+    D: serde::Deserializer<'de>,
+{
+    #[serde_as]
+    #[derive(Deserialize)]
+    struct Helper(#[serde_as(deserialize_as = "OneOrMany<DisplayFromStr>")] Vec<String>);
+
+    let helper = Helper::deserialize(deserializer)?;
+    if helper.0.len() == 1 && helper.0[0].starts_with("env:") {
+        // Parse from environment variable
+        let env_var = helper.0[0].trim_start_matches("env:");
+        if let Ok(urls) = var(env_var) {
+            return Ok(urls.split(',').map(String::from).collect());
+        }
+    }
+    Ok(helper.0)
+}
+
 fn parse_ip(ip: &Option<String>) -> Ipv4Addr {
     ip.as_ref().map_or(*DEFAULT_IP, |s| {
         s.parse::<Ipv4Addr>().unwrap_or(*DEFAULT_IP)

crates/rbuilder/src/live_builder/config.rs

@@ -256,6 +256,8 @@ mod test {
             "0xb785cd753d62bb25c0afaf75fd40dd94bf295051fdadc972ec857ad6b29cfa72",
         );
 
+        env::set_var("CL_NODE_URL", "http://localhost:3500");
+
         let config: Config = load_config_toml_and_env(p).expect("Config load");
 
         assert_eq!(
@@ -266,6 +268,11 @@ mod test {
                 .address,
             address!("75618c70B1BBF111F6660B0E3760387fb494102B")
         );
+
+        assert!(config
+            .base_config
+            .cl_node_url
+            .contains(&"http://localhost:3500".to_string()));
     }
 
     #[test]