Use InetAddresses.forString instead of InetAddress.getByName

Unlike InetAddress.getByName(), Guava's InetAddresses.forString()
never cause DNS services to be accessed.
JDK equivalents whenever you are expecting to handle only IP address string literals,
so there is no blocking DNS penalty for a malformed string.

See:
https://google.github.io/guava/releases/22.0/api/docs/com/google/common/net/InetAddresses.html#forString-java.lang.String-

Change-Id: Id1fc5fa45465b0e0b3aea7d60b9fdb855240d902
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

2 files changed, 4 insertions, 16 deletions

diff --git a/infra/northbound/netconf/src/main/java/io/fd/honeycomb/northbound/netconf/NetconfSshServerProvider.java b/infra/northbound/netconf/src/main/java/io/fd/honeycomb/northbound/netconf/NetconfSshServerProvider.java
index d44b4f221..02847d733 100644
--- a/infra/northbound/netconf/src/main/java/io/fd/honeycomb/northbound/netconf/NetconfSshServerProvider.java
+++ b/infra/northbound/netconf/src/main/java/io/fd/honeycomb/northbound/netconf/NetconfSshServerProvider.java
@@ -16,6 +16,7 @@
 
 package io.fd.honeycomb.northbound.netconf;
 
+import com.google.common.net.InetAddresses;
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import com.google.inject.Inject;
 import io.fd.honeycomb.binding.init.ProviderTrait;
@@ -30,7 +31,6 @@ import io.netty.util.concurrent.GlobalEventExecutor;
 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
-import java.net.UnknownHostException;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import org.apache.sshd.server.keyprovider.PEMGeneratorHostKeyProvider;
@@ -74,13 +74,7 @@ public final class NetconfSshServerProvider extends ProviderTrait<NetconfSshServ
         // TODO(HONEYCOMB-414):  the logic below is very similar to
         // org.opendaylight.netconf.ssh.NetconfNorthboundSshServer (introduced in Carbon), so consider reusing it
         // (requires fixing hardcoded private key path).
-        InetAddress sshBindingAddress = null;
-        try {
-            sshBindingAddress = InetAddress.getByName(cfgAttributes.netconfSshBindingAddress.get());
-        } catch (UnknownHostException e) {
-            throw new IllegalArgumentException("Illegal binding address", e);
-        }
-
+        final InetAddress sshBindingAddress = InetAddresses.forString(cfgAttributes.netconfSshBindingAddress.get());
         final InetSocketAddress bindingAddress =
                 new InetSocketAddress(sshBindingAddress, cfgAttributes.netconfSshBindingPort.get());
 
diff --git a/infra/northbound/netconf/src/main/java/io/fd/honeycomb/northbound/netconf/NetconfTcpServerProvider.java b/infra/northbound/netconf/src/main/java/io/fd/honeycomb/northbound/netconf/NetconfTcpServerProvider.java
index c1fc0a594..031f0f9d9 100644
--- a/infra/northbound/netconf/src/main/java/io/fd/honeycomb/northbound/netconf/NetconfTcpServerProvider.java
+++ b/infra/northbound/netconf/src/main/java/io/fd/honeycomb/northbound/netconf/NetconfTcpServerProvider.java
@@ -16,6 +16,7 @@
 
 package io.fd.honeycomb.northbound.netconf;
 
+import com.google.common.net.InetAddresses;
 import com.google.inject.Inject;
 import io.fd.honeycomb.binding.init.ProviderTrait;
 import io.fd.honeycomb.infra.distro.InitializationException;
@@ -24,7 +25,6 @@ import io.netty.channel.ChannelFuture;
 import io.netty.util.concurrent.GenericFutureListener;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
-import java.net.UnknownHostException;
 import org.opendaylight.netconf.api.NetconfServerDispatcher;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -45,13 +45,7 @@ public final class NetconfTcpServerProvider extends ProviderTrait<NetconfTcpServ
             return null;
         }
         LOG.info("Starting NETCONF TCP");
-        InetAddress name = null;
-        try {
-            name = InetAddress.getByName(cfgAttributes.netconfTcpBindingAddress.get());
-        } catch (UnknownHostException e) {
-            throw new IllegalArgumentException("Illegal binding address", e);
-        }
-
+        final InetAddress name = InetAddresses.forString(cfgAttributes.netconfTcpBindingAddress.get());
         final InetSocketAddress unresolved = new InetSocketAddress(name, cfgAttributes.netconfTcpBindingPort.get());
 
         ChannelFuture tcpServer = dispatcher.createServer(unresolved);