Enable mplex by default and change --enable-mplex to take bool (#9476)

Enable Mplex by default, and let `--enable-mplex` take a bool argument.


Co-Authored-By: Daniel Knopik <daniel@dknopik.de>

Co-Authored-By: Michael Sproul <michael@sigmaprime.io>

Co-Authored-By: Michael Sproul <michaelsproul@users.noreply.github.com>

beacon_node/lighthouse_network/src/config.rs

@@ -125,7 +125,7 @@ pub struct Config {
     /// Whether light client protocols should be enabled.
     pub enable_light_client_server: bool,
 
-    /// Whether to enable the deprecated mplex multiplexer alongside yamux.
+    /// Whether to enable the mplex multiplexer alongside yamux. Enabled by default.
     pub enable_mplex: bool,
 
     /// Configuration for the outbound rate limiter (requests made by this node).
@@ -365,7 +365,7 @@ impl Default for Config {
             proposer_only: false,
             metrics_enabled: false,
             enable_light_client_server: true,
-            enable_mplex: false,
+            enable_mplex: true,
             outbound_rate_limiter_config: None,
             invalid_block_storage: None,
             inbound_rate_limiter_config: None,

beacon_node/src/cli.rs

@@ -390,9 +390,12 @@ pub fn cli_app() -> Command {
         .arg(
             Arg::new("enable-mplex")
                 .long("enable-mplex")
-                .action(ArgAction::SetTrue)
+                .value_name("BOOLEAN")
-                .help_heading(FLAG_HEADER)
+                .action(ArgAction::Set)
-                .help("Enables mplex multiplexer alongside yamux. Yamux is preferred when both are available.")
+                .num_args(0..=1)
+                .default_value("true")
+                .default_missing_value("true")
+                .help("Enables the mplex multiplexer alongside yamux. Yamux is preferred when both are available. Enabled by default; set to \"false\" to disable.")
                 .display_order(0)
         )
         .arg(

beacon_node/src/config.rs

@@ -7,7 +7,7 @@ use beacon_chain::graffiti_calculator::GraffitiOrigin;
 use bls::PublicKeyBytes;
 use clap::{ArgMatches, Id, parser::ValueSource};
 use clap_utils::flags::DISABLE_MALLOC_TUNING_FLAG;
-use clap_utils::{parse_flag, parse_required};
+use clap_utils::{parse_flag, parse_optional, parse_required};
 use client::{ClientConfig, ClientGenesis};
 use directory::{DEFAULT_BEACON_NODE_DIR, DEFAULT_NETWORK_DIR, DEFAULT_ROOT_DIR};
 use environment::RuntimeContext;
@@ -1434,8 +1434,8 @@ pub fn set_network_config(
         config.disable_quic_support = true;
     }
 
-    if parse_flag(cli_args, "enable-mplex") {
+    if let Some(enable_mplex) = parse_optional(cli_args, "enable-mplex")? {
-        config.enable_mplex = true;
+        config.enable_mplex = enable_mplex;
     }
 
     if parse_flag(cli_args, "disable-upnp") {

book/src/help_bn.md

@@ -84,6 +84,10 @@ Options:
       --discovery-port6 <PORT>
           The UDP port that discovery will listen on over IPv6 if listening over
           both IPv4 and IPv6. Defaults to `port6`
+      --enable-mplex [<BOOLEAN>]
+          Enables the mplex multiplexer alongside yamux. Yamux is preferred when
+          both are available. Enabled by default; set to "false" to disable.
+          [default: true]
       --enr-address <ADDRESS>...
           The IP address/ DNS address to broadcast to other peers on how to
           reach this node. If a DNS address is provided, the enr-address is set
@@ -489,9 +493,6 @@ Flags:
           Sets the local ENR IP address and port to match those set for
           lighthouse. Specifically, the IP address will be the value of
           --listen-address and the UDP port will be --discovery-port.
-      --enable-mplex
-          Enables mplex multiplexer alongside yamux. Yamux is preferred when
-          both are available.
       --enable-partial-columns
           Enable partial messages for data columns. This can reduce the amount
           of data sent over the network. Enabled by default on Hoodi and

lighthouse/tests/beacon_node.rs

@@ -2785,6 +2785,45 @@ fn invalid_block_roots_default_mainnet() {
         })
 }
 
+#[test]
+fn enable_mplex_default() {
+    CommandLineTest::new()
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert!(config.network.enable_mplex);
+        })
+}
+
+#[test]
+fn enable_mplex_true() {
+    CommandLineTest::new()
+        .flag("enable-mplex", Some("true"))
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert!(config.network.enable_mplex);
+        })
+}
+
+#[test]
+fn enable_mplex_false() {
+    CommandLineTest::new()
+        .flag("enable-mplex", Some("false"))
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert!(!config.network.enable_mplex);
+        })
+}
+
+#[test]
+fn enable_mplex_no_value() {
+    CommandLineTest::new()
+        .flag("enable-mplex", None)
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert!(config.network.enable_mplex);
+        })
+}
+
 #[test]
 fn partial_columns() {
     CommandLineTest::new()