netconf/netconf-impl/src/main/java/org/opendaylight/netconf/impl/osgi/NetconfOperationRouterImpl.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. 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.impl.osgi;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.collect.ImmutableSet;
  12 import com.google.common.collect.Maps;
  13 import java.util.Collection;
  14 import java.util.Collections;
  15 import java.util.HashSet;
  16 import java.util.NavigableMap;
  17 import java.util.Set;
  18 import java.util.TreeMap;
  19 import org.opendaylight.controller.config.util.xml.DocumentedException;
  20 import org.opendaylight.controller.config.util.xml.XmlUtil;
  21 import org.opendaylight.netconf.api.monitoring.NetconfMonitoringService;
  22 import org.opendaylight.netconf.impl.NetconfServerSession;
  23 import org.opendaylight.netconf.impl.mapping.operations.DefaultCloseSession;
  24 import org.opendaylight.netconf.impl.mapping.operations.DefaultNetconfOperation;
  25 import org.opendaylight.netconf.impl.mapping.operations.DefaultStartExi;
  26 import org.opendaylight.netconf.impl.mapping.operations.DefaultStopExi;
  27 import org.opendaylight.netconf.mapping.api.HandlingPriority;
  28 import org.opendaylight.netconf.mapping.api.NetconfOperation;
  29 import org.opendaylight.netconf.mapping.api.NetconfOperationChainedExecution;
  30 import org.opendaylight.netconf.mapping.api.NetconfOperationService;
  31 import org.opendaylight.netconf.mapping.api.SessionAwareNetconfOperation;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34 import org.w3c.dom.Document;
  35
  36 public class NetconfOperationRouterImpl implements NetconfOperationRouter {
  37
  38     private static final Logger LOG = LoggerFactory.getLogger(NetconfOperationRouterImpl.class);
  39     private final NetconfOperationService netconfOperationServiceSnapshot;
  40     private final Collection<NetconfOperation> allNetconfOperations;
  41
  42     public NetconfOperationRouterImpl(final NetconfOperationService netconfOperationServiceSnapshot,
  43                                       final NetconfMonitoringService netconfMonitoringService, final String sessionId) {
  44         this.netconfOperationServiceSnapshot = Preconditions.checkNotNull(netconfOperationServiceSnapshot);
  45
  46         final Set<NetconfOperation> ops = new HashSet<>();
  47         ops.add(new DefaultCloseSession(sessionId, this));
  48         ops.add(new DefaultStartExi(sessionId));
  49         ops.add(new DefaultStopExi(sessionId));
  50
  51         ops.addAll(netconfOperationServiceSnapshot.getNetconfOperations());
  52
  53         allNetconfOperations = ImmutableSet.copyOf(ops);
  54     }
  55
  56     @Override
  57     public Document onNetconfMessage(final Document message, final NetconfServerSession session) throws DocumentedException {
  58         Preconditions.checkNotNull(allNetconfOperations, "Operation router was not initialized properly");
  59
  60         final NetconfOperationExecution netconfOperationExecution;
  61         try {
  62             netconfOperationExecution = getNetconfOperationWithHighestPriority(message, session);
  63         } catch (IllegalArgumentException | IllegalStateException e) {
  64             final String messageAsString = XmlUtil.toString(message);
  65             LOG.warn("Unable to handle rpc {} on session {}", messageAsString, session, e);
  66
  67             final DocumentedException.ErrorTag tag;
  68             if (e instanceof IllegalArgumentException) {
  69                 tag = DocumentedException.ErrorTag.OPERATION_NOT_SUPPORTED;
  70             } else {
  71                 tag = DocumentedException.ErrorTag.OPERATION_FAILED;
  72             }
  73
  74             throw new DocumentedException(
  75                 String.format("Unable to handle rpc %s on session %s", messageAsString, session),
  76                     e, DocumentedException.ErrorType.APPLICATION,
  77                     tag, DocumentedException.ErrorSeverity.ERROR,
  78                 Collections.singletonMap(tag.toString(), e.getMessage()));
  79         } catch (final RuntimeException e) {
  80             throw handleUnexpectedEx("Unexpected exception during netconf operation sort", e);
  81         }
  82
  83         try {
  84             return executeOperationWithHighestPriority(message, netconfOperationExecution);
  85         } catch (final RuntimeException e) {
  86             throw handleUnexpectedEx("Unexpected exception during netconf operation execution", e);
  87         }
  88     }
  89
  90     @Override
  91     public void close() throws Exception {
  92         netconfOperationServiceSnapshot.close();
  93     }
  94
  95     private static DocumentedException handleUnexpectedEx(final String s, final Exception e) throws DocumentedException {
  96         LOG.error("{}", s, e);
  97         return new DocumentedException("Unexpected error",
  98                 DocumentedException.ErrorType.APPLICATION,
  99                 DocumentedException.ErrorTag.OPERATION_FAILED,
 100                 DocumentedException.ErrorSeverity.ERROR,
 101                 Collections.singletonMap(DocumentedException.ErrorSeverity.ERROR.toString(), e.toString()));
 102     }
 103
 104     private Document executeOperationWithHighestPriority(final Document message,
 105             final NetconfOperationExecution netconfOperationExecution)
 106             throws DocumentedException {
 107         if (LOG.isDebugEnabled()) {
 108             LOG.debug("Forwarding netconf message {} to {}", XmlUtil.toString(message), netconfOperationExecution.netconfOperation);
 109         }
 110
 111         return netconfOperationExecution.execute(message);
 112     }
 113
 114     private NetconfOperationExecution getNetconfOperationWithHighestPriority(
 115             final Document message, final NetconfServerSession session) throws DocumentedException {
 116
 117         final NavigableMap<HandlingPriority, NetconfOperation> sortedByPriority = getSortedNetconfOperationsWithCanHandle(
 118                 message, session);
 119
 120         if (sortedByPriority.isEmpty()) {
 121             throw new IllegalArgumentException(String.format("No %s available to handle message %s",
 122                 NetconfOperation.class.getName(), XmlUtil.toString(message)));
 123         }
 124
 125         return NetconfOperationExecution.createExecutionChain(sortedByPriority, sortedByPriority.lastKey());
 126     }
 127
 128     private TreeMap<HandlingPriority, NetconfOperation> getSortedNetconfOperationsWithCanHandle(final Document message,
 129             final NetconfServerSession session) throws DocumentedException {
 130         final TreeMap<HandlingPriority, NetconfOperation> sortedPriority = Maps.newTreeMap();
 131
 132         for (final NetconfOperation netconfOperation : allNetconfOperations) {
 133             final HandlingPriority handlingPriority = netconfOperation.canHandle(message);
 134             if (netconfOperation instanceof DefaultNetconfOperation) {
 135                 ((DefaultNetconfOperation) netconfOperation).setNetconfSession(session);
 136             }
 137             if(netconfOperation instanceof SessionAwareNetconfOperation) {
 138                 ((SessionAwareNetconfOperation) netconfOperation).setSession(session);
 139             }
 140             if (!handlingPriority.equals(HandlingPriority.CANNOT_HANDLE)) {
 141
 142                 Preconditions.checkState(!sortedPriority.containsKey(handlingPriority),
 143                         "Multiple %s available to handle message %s with priority %s, %s and %s",
 144                         NetconfOperation.class.getName(), message, handlingPriority, netconfOperation, sortedPriority.get(handlingPriority));
 145                 sortedPriority.put(handlingPriority, netconfOperation);
 146             }
 147         }
 148         return sortedPriority;
 149     }
 150
 151     private static class NetconfOperationExecution implements NetconfOperationChainedExecution {
 152         private final NetconfOperation netconfOperation;
 153         private final NetconfOperationChainedExecution subsequentExecution;
 154
 155         private NetconfOperationExecution(final NetconfOperation netconfOperation, final NetconfOperationChainedExecution subsequentExecution) {
 156             this.netconfOperation = netconfOperation;
 157             this.subsequentExecution = subsequentExecution;
 158         }
 159
 160         @Override
 161         public boolean isExecutionTermination() {
 162             return false;
 163         }
 164
 165         @Override
 166         public Document execute(final Document message) throws DocumentedException {
 167             return netconfOperation.handle(message, subsequentExecution);
 168         }
 169
 170         public static NetconfOperationExecution createExecutionChain(
 171                 final NavigableMap<HandlingPriority, NetconfOperation> sortedByPriority, final HandlingPriority handlingPriority) {
 172             final NetconfOperation netconfOperation = sortedByPriority.get(handlingPriority);
 173             final HandlingPriority subsequentHandlingPriority = sortedByPriority.lowerKey(handlingPriority);
 174
 175             NetconfOperationChainedExecution subsequentExecution = null;
 176
 177             if (subsequentHandlingPriority != null) {
 178                 subsequentExecution = createExecutionChain(sortedByPriority, subsequentHandlingPriority);
 179             } else {
 180                 subsequentExecution = EXECUTION_TERMINATION_POINT;
 181             }
 182
 183             return new NetconfOperationExecution(netconfOperation, subsequentExecution);
 184         }
 185     }
 186
 187     @Override
 188     public String toString() {
 189         return "NetconfOperationRouterImpl{" + "netconfOperationServiceSnapshot=" + netconfOperationServiceSnapshot
 190                 + '}';
 191     }
 192 }