Disable HTTP server if metrics not specified

Currently HTTP server is needed only to serve prometheus metrics. Also,
node will no longer crash when HTTP server crashes unexpectedly, as it
is not necessary for properly functioning node.

Author: ArtiomTr

lean_client/src/main.rs

@@ -12,7 +12,7 @@ use fork_choice::{
 };
 use http_api::HttpServerConfig;
 use libp2p_identity::Keypair;
-use metrics::{METRICS, Metrics, MetricsServerConfig};
+use metrics::{METRICS, Metrics};
 use networking::gossipsub::config::GossipsubConfig;
 use networking::gossipsub::topic::get_topics;
 use networking::network::{NetworkService, NetworkServiceConfig};
@@ -377,9 +377,11 @@ async fn main() -> Result<()> {
 
     let chain_outbound_sender = outbound_p2p_sender.clone();
 
-    let http_handle = task::spawn(async move {
-        if let Err(err) = http_api::run_server(args.http_config).await {
-            error!("HTTP Server failed with error: {err:?}");
+    task::spawn(async move {
+        if args.http_config.metrics_enabled() {
+            if let Err(err) = http_api::run_server(args.http_config).await {
+                error!("HTTP Server failed with error: {err:?}");
+            }
         }
     });
 
@@ -606,9 +608,6 @@ async fn main() -> Result<()> {
         _ = chain_handle => {
             info!("Chain service finished.");
         }
-        _ = http_handle => {
-            info!("Http service finished.");
-        }
     }
 
     info!("Main async task exiting...");