Remove LC server config from HTTP API (#7017)

Partly addresses

- https://github.com/sigp/lighthouse/issues/6959


  Use the `enable_light_client_server` field from the beacon chain config in the HTTP API. I think we can make this the single source of truth, as I think the network crate also has access to the beacon chain config.

beacon_node/http_api/src/lib.rs

@@ -155,7 +155,6 @@ pub struct Config {
     pub enable_beacon_processor: bool,
     #[serde(with = "eth2::types::serde_status_code")]
     pub duplicate_block_status_code: StatusCode,
-    pub enable_light_client_server: bool,
     pub target_peers: usize,
 }
 
@@ -171,7 +170,6 @@ impl Default for Config {
             sse_capacity_multiplier: 1,
             enable_beacon_processor: true,
             duplicate_block_status_code: StatusCode::ACCEPTED,
-            enable_light_client_server: true,
             target_peers: 100,
         }
     }
@@ -296,18 +294,6 @@ pub fn prometheus_metrics() -> warp::filters::log::Log<impl Fn(warp::filters::lo
     })
 }
 
-fn enable(is_enabled: bool) -> impl Filter<Extract = (), Error = warp::Rejection> + Clone {
-    warp::any()
-        .and_then(move || async move {
-            if is_enabled {
-                Ok(())
-            } else {
-                Err(warp::reject::not_found())
-            }
-        })
-        .untuple_one()
-}
-
 /// Creates a server that will serve requests using information from `ctx`.
 ///
 /// The server will shut down gracefully when the `shutdown` future resolves.
@@ -493,6 +479,18 @@ pub fn serve<T: BeaconChainTypes>(
                 },
             );
 
+    // Create a `warp` filter that returns 404s if the light client server is disabled.
+    let light_client_server_filter =
+        warp::any()
+            .and(chain_filter.clone())
+            .then(|chain: Arc<BeaconChain<T>>| async move {
+                if chain.config.enable_light_client_server {
+                    Ok(())
+                } else {
+                    Err(warp::reject::not_found())
+                }
+            });
+
     // Create a `warp` filter that provides access to the logger.
     let inner_ctx = ctx.clone();
     let log_filter = warp::any().map(move || inner_ctx.log.clone());
@@ -2452,6 +2450,7 @@ pub fn serve<T: BeaconChainTypes>(
     let beacon_light_client_path = eth_v1
         .and(warp::path("beacon"))
         .and(warp::path("light_client"))
+        .and(light_client_server_filter)
         .and(chain_filter.clone());
 
     // GET beacon/light_client/bootstrap/{block_root}
@@ -2467,11 +2466,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::header::optional::<api_types::Accept>("accept"))
         .then(
-            |chain: Arc<BeaconChain<T>>,
+            |light_client_server_enabled: Result<(), Rejection>,
+             chain: Arc<BeaconChain<T>>,
              task_spawner: TaskSpawner<T::EthSpec>,
              block_root: Hash256,
              accept_header: Option<api_types::Accept>| {
                 task_spawner.blocking_response_task(Priority::P1, move || {
+                    light_client_server_enabled?;
                     get_light_client_bootstrap::<T>(chain, &block_root, accept_header)
                 })
             },
@@ -2485,10 +2486,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::header::optional::<api_types::Accept>("accept"))
         .then(
-            |chain: Arc<BeaconChain<T>>,
+            |light_client_server_enabled: Result<(), Rejection>,
+             chain: Arc<BeaconChain<T>>,
              task_spawner: TaskSpawner<T::EthSpec>,
              accept_header: Option<api_types::Accept>| {
                 task_spawner.blocking_response_task(Priority::P1, move || {
+                    light_client_server_enabled?;
                     let update = chain
                         .light_client_server_cache
                         .get_latest_optimistic_update()
@@ -2532,10 +2535,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::header::optional::<api_types::Accept>("accept"))
         .then(
-            |chain: Arc<BeaconChain<T>>,
+            |light_client_server_enabled: Result<(), Rejection>,
+             chain: Arc<BeaconChain<T>>,
              task_spawner: TaskSpawner<T::EthSpec>,
              accept_header: Option<api_types::Accept>| {
                 task_spawner.blocking_response_task(Priority::P1, move || {
+                    light_client_server_enabled?;
                     let update = chain
                         .light_client_server_cache
                         .get_latest_finality_update()
@@ -2580,11 +2585,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::query::<api_types::LightClientUpdatesQuery>())
         .and(warp::header::optional::<api_types::Accept>("accept"))
         .then(
-            |chain: Arc<BeaconChain<T>>,
+            |light_client_server_enabled: Result<(), Rejection>,
+             chain: Arc<BeaconChain<T>>,
              task_spawner: TaskSpawner<T::EthSpec>,
              query: LightClientUpdatesQuery,
              accept_header: Option<api_types::Accept>| {
                 task_spawner.blocking_response_task(Priority::P1, move || {
+                    light_client_server_enabled?;
                     get_light_client_updates::<T>(chain, query, accept_header)
                 })
             },
@@ -4723,22 +4730,10 @@ pub fn serve<T: BeaconChainTypes>(
                 .uor(get_lighthouse_database_info)
                 .uor(get_lighthouse_block_rewards)
                 .uor(get_lighthouse_attestation_performance)
-                .uor(
-                    enable(ctx.config.enable_light_client_server)
-                        .and(get_beacon_light_client_optimistic_update),
-                )
-                .uor(
-                    enable(ctx.config.enable_light_client_server)
-                        .and(get_beacon_light_client_finality_update),
-                )
-                .uor(
-                    enable(ctx.config.enable_light_client_server)
-                        .and(get_beacon_light_client_bootstrap),
-                )
-                .uor(
-                    enable(ctx.config.enable_light_client_server)
-                        .and(get_beacon_light_client_updates),
-                )
+                .uor(get_beacon_light_client_optimistic_update)
+                .uor(get_beacon_light_client_finality_update)
+                .uor(get_beacon_light_client_bootstrap)
+                .uor(get_beacon_light_client_updates)
                 .uor(get_lighthouse_block_packing_efficiency)
                 .uor(get_lighthouse_merge_readiness)
                 .uor(get_events)

beacon_node/http_api/src/test_utils.rs

@@ -249,7 +249,6 @@ pub async fn create_api_server_with_config<T: BeaconChainTypes>(
             enabled: true,
             listen_port: port,
             data_dir: std::path::PathBuf::from(DEFAULT_ROOT_DIR),
-            enable_light_client_server: true,
             ..http_config
         },
         chain: Some(chain),

beacon_node/src/config.rs

@@ -174,9 +174,6 @@ pub fn get_config<E: EthSpec>(
 
         client_config.http_api.duplicate_block_status_code =
             parse_required(cli_args, "http-duplicate-block-status")?;
-
-        client_config.http_api.enable_light_client_server =
-            !cli_args.get_flag("disable-light-client-server");
     }
 
     if cli_args.get_flag("light-client-server") {

lighthouse/tests/beacon_node.rs

@@ -2506,7 +2506,6 @@ fn light_client_server_default() {
         .with_config(|config| {
             assert!(config.network.enable_light_client_server);
             assert!(config.chain.enable_light_client_server);
-            assert!(config.http_api.enable_light_client_server);
         });
 }
 
@@ -2539,7 +2538,6 @@ fn light_client_http_server_disabled() {
         .flag("disable-light-client-server", None)
         .run_with_zero_port()
         .with_config(|config| {
-            assert!(!config.http_api.enable_light_client_server);
             assert!(!config.network.enable_light_client_server);
             assert!(!config.chain.enable_light_client_server);
         });

testing/simulator/src/local_network.rs

@@ -44,7 +44,6 @@ fn default_client_config(network_params: LocalNetworkParams, genesis_time: u64)
     beacon_config.network.enable_light_client_server = true;
     beacon_config.network.discv5_config.enable_packet_filter = false;
     beacon_config.chain.enable_light_client_server = true;
-    beacon_config.http_api.enable_light_client_server = true;
     beacon_config.chain.optimistic_finalized_sync = false;
     beacon_config.trusted_setup = serde_json::from_reader(get_trusted_setup().as_slice())
         .expect("Trusted setup bytes should be valid");