apps/callhome-provider/src/main/java/org/opendaylight/netconf/topology/callhome/CallHomeTransportChannelListener.java

   1 /*
   2  * Copyright (c) 2023 PANTHEON.tech s.r.o. and others. All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.netconf.topology.callhome;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import io.netty.handler.ssl.SslHandler;
  13 import org.eclipse.jdt.annotation.NonNull;
  14 import org.opendaylight.netconf.client.ClientChannelInitializer;
  15 import org.opendaylight.netconf.client.NetconfClientSession;
  16 import org.opendaylight.netconf.client.NetconfClientSessionNegotiatorFactory;
  17 import org.opendaylight.netconf.transport.api.TransportChannel;
  18 import org.opendaylight.netconf.transport.api.TransportChannelListener;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 public class CallHomeTransportChannelListener implements TransportChannelListener {
  23     private static final Logger LOG = LoggerFactory.getLogger(CallHomeTransportChannelListener.class);
  24
  25     private final @NonNull NetconfClientSessionNegotiatorFactory negotiationFactory;
  26     private final CallHomeSessionContextManager<?> contextManager;
  27     private final CallHomeStatusRecorder statusRecorder;
  28
  29     public CallHomeTransportChannelListener(final NetconfClientSessionNegotiatorFactory negotiationFactory,
  30             final CallHomeSessionContextManager<?> contextManager, final CallHomeStatusRecorder statusRecorder) {
  31         this.negotiationFactory = requireNonNull(negotiationFactory);
  32         this.contextManager = requireNonNull(contextManager);
  33         this.statusRecorder = requireNonNull(statusRecorder);
  34     }
  35
  36     @Override
  37     public void onTransportChannelEstablished(final TransportChannel transportChannel) {
  38         final var channel = transportChannel.channel();
  39
  40         // identify or create session context associated with current connection
  41         final var context = contextManager.findByChannel(channel);
  42         if (context == null) {
  43             LOG.error("No valid context found for incoming connection from {}. Connection rejected.",
  44                 channel.remoteAddress());
  45             channel.close();
  46             return;
  47         }
  48
  49         LOG.info("Starting netconf negotiation for context: {}", context);
  50
  51         // init NETCONF negotiation
  52         final var promise = channel.eventLoop().<NetconfClientSession>newPromise();
  53         promise.addListener(ignored -> {
  54             final var cause = promise.cause();
  55             if (cause != null) {
  56                 contextManager.remove(context.id());
  57                 context.settableFuture().setException(cause);
  58                 statusRecorder.reportNetconfFailure(context.id());
  59                 LOG.error("Netconf session failed for context: {}", context, cause);
  60             } else {
  61                 statusRecorder.reportSuccess(context.id());
  62                 context.settableFuture().set(promise.getNow());
  63                 LOG.info("Netconf session established for context: {}", context);
  64             }
  65         });
  66         new ClientChannelInitializer(negotiationFactory, context::netconfSessionListener)
  67             .initialize(channel, promise);
  68
  69         // this is required to trigger NETCONF negotiation on TLS
  70         if (channel.pipeline().get(SslHandler.class) != null) {
  71             channel.pipeline().fireChannelActive();
  72         }
  73     }
  74
  75     @Override
  76     public void onTransportChannelFailed(final Throwable cause) {
  77         statusRecorder.onTransportChannelFailure(cause);
  78     }
  79 }