xds: xDS server - unnecessary dns lookup (blocking) when parsing FilterChainMatch address prefixes?

[sergiitk]

A bit strange that EnvoyServerProtoData.CidrRange.create uses InetAddress.getByName, which will perform a DNS lookup when a hostname provided in addressPrefix:

grpc-java/xds/src/main/java/io/grpc/xds/EnvoyServerProtoData.java

Lines 153 to 157 in cdab410

	static CidrRange create(String addressPrefix, int prefixLen) throws UnknownHostException {
	return new AutoValue_EnvoyServerProtoData_CidrRange(
	InetAddress.getByName(addressPrefix), prefixLen);
	}
	}

Should we be using Guava's InetAddresses#forString which is "deliberately avoids all nameservice lookups"?

[sergiitk]

JDK 22 now has InetAddress#ofLiteral for that. Took a while 😆