Allow multiple listen addresses

Author: MegaRedHand

config/runtime.exs

@@ -18,7 +18,7 @@ switches = [
   log_file: :string,
   beacon_api: :boolean,
   beacon_api_port: :integer,
-  listen_address: :string,
+  listen_address: [:string, :keep],
   discovery_port: :integer,
   boot_nodes: :string,
   keystore_file: :string,
@@ -123,7 +123,7 @@ bootnodes =
 config :lambda_ethereum_consensus, :libp2p,
   port: discovery_port,
   bootnodes: bootnodes,
-  listen_addr: listen_address
+  listen_addr: [listen_address]
 
 # Engine API
 

lib/lambda_ethereum_consensus/beacon/beacon_node.ex

@@ -83,7 +83,7 @@ defmodule LambdaEthereumConsensus.Beacon.BeaconNode do
     port = Keyword.fetch!(config, :port)
     bootnodes = Keyword.fetch!(config, :bootnodes)
 
-    listen_addr = Keyword.fetch!(config, :listen_addr) |> parse_listen_addr()
+    listen_addr = Keyword.fetch!(config, :listen_addr) |> Enum.map(&parse_listen_addr/1)
 
     if Enum.empty?(bootnodes) do
       Logger.warning("No bootnodes configured.")
@@ -97,8 +97,6 @@ defmodule LambdaEthereumConsensus.Beacon.BeaconNode do
     ]
   end
 
-  defp parse_listen_addr([]), do: []
-
   defp parse_listen_addr(addr) do
     case String.split(addr, ":") do
       [ip, port] ->