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 static com.google.common.base.Preconditions.checkState;
  11 import static java.util.Objects.requireNonNull;
  12
  13 import com.google.common.collect.ImmutableSet;
  14 import java.util.Collection;
  15 import java.util.Collections;
  16 import java.util.HashSet;
  17 import java.util.NavigableMap;
  18 import java.util.Set;
  19 import java.util.TreeMap;
  20 import org.opendaylight.netconf.api.DocumentedException;
  21 import org.opendaylight.netconf.api.monitoring.NetconfMonitoringService;
  22 import org.opendaylight.netconf.api.xml.XmlUtil;
  23 import org.opendaylight.netconf.impl.NetconfServerSession;
  24 import org.opendaylight.netconf.impl.mapping.operations.DefaultCloseSession;
  25 import org.opendaylight.netconf.impl.mapping.operations.DefaultNetconfOperation;
  26 import org.opendaylight.netconf.impl.mapping.operations.DefaultStartExi;
  27 import org.opendaylight.netconf.impl.mapping.operations.DefaultStopExi;
  28 import org.opendaylight.netconf.mapping.api.HandlingPriority;
  29 import org.opendaylight.netconf.mapping.api.NetconfOperation;
  30 import org.opendaylight.netconf.mapping.api.NetconfOperationChainedExecution;
  31 import org.opendaylight.netconf.mapping.api.NetconfOperationService;
  32 import org.opendaylight.netconf.mapping.api.SessionAwareNetconfOperation;
  33 import org.slf4j.Logger;
  34 import org.slf4j.LoggerFactory;
  35 import org.w3c.dom.Document;
  36
  37 public class NetconfOperationRouterImpl implements NetconfOperationRouter {
  38
  39     private static final Logger LOG = LoggerFactory.getLogger(NetconfOperationRouterImpl.class);
  40     private final NetconfOperationService netconfOperationServiceSnapshot;
  41     private final Collection<NetconfOperation> allNetconfOperations;
  42
  43     public NetconfOperationRouterImpl(final NetconfOperationService netconfOperationServiceSnapshot,
  44                                       final NetconfMonitoringService netconfMonitoringService, final String sessionId) {
  45         this.netconfOperationServiceSnapshot = requireNonNull(netconfOperationServiceSnapshot);
  46
  47         final Set<NetconfOperation> ops = new HashSet<>();
  48         ops.add(new DefaultCloseSession(sessionId, this));
  49         ops.add(new DefaultStartExi(sessionId));
  50         ops.add(new DefaultStopExi(sessionId));
  51
  52         ops.addAll(netconfOperationServiceSnapshot.getNetconfOperations());
  53
  54         allNetconfOperations = ImmutableSet.copyOf(ops);
  55     }
  56
  57     @SuppressWarnings("checkstyle:IllegalCatch")
  58     @Override
  59     public Document onNetconfMessage(final Document message, final NetconfServerSession session) throws
  60             DocumentedException {
  61         requireNonNull(allNetconfOperations, "Operation router was not initialized properly");
  62
  63         final NetconfOperationExecution netconfOperationExecution;
  64         try {
  65             netconfOperationExecution = getNetconfOperationWithHighestPriority(message, session);
  66         } catch (IllegalArgumentException | IllegalStateException e) {
  67             final String messageAsString = XmlUtil.toString(message);
  68             LOG.warn("Unable to handle rpc {} on session {}", messageAsString, session, e);
  69
  70             final DocumentedException.ErrorTag tag;
  71             if (e instanceof IllegalArgumentException) {
  72                 tag = DocumentedException.ErrorTag.OPERATION_NOT_SUPPORTED;
  73             } else {
  74                 tag = DocumentedException.ErrorTag.OPERATION_FAILED;
  75             }
  76
  77             throw new DocumentedException(
  78                     String.format("Unable to handle rpc %s on session %s", messageAsString, session),
  79                     e, DocumentedException.ErrorType.APPLICATION,
  80                     tag, DocumentedException.ErrorSeverity.ERROR,
  81                     Collections.singletonMap(tag.toString(), e.getMessage()));
  82         } catch (final RuntimeException e) {
  83             throw handleUnexpectedEx("sort", e);
  84         }
  85
  86         try {
  87             return executeOperationWithHighestPriority(message, netconfOperationExecution);
  88         } catch (final RuntimeException e) {
  89             throw handleUnexpectedEx("execution", e);
  90         }
  91     }
  92
  93     @Override
  94     public void close() {
  95         netconfOperationServiceSnapshot.close();
  96     }
  97
  98     private static DocumentedException handleUnexpectedEx(final String op, final Exception exception) {
  99         LOG.error("Unexpected exception during netconf operation {}", op, exception);
 100         return new DocumentedException("Unexpected error",
 101                 DocumentedException.ErrorType.APPLICATION,
 102                 DocumentedException.ErrorTag.OPERATION_FAILED,
 103                 DocumentedException.ErrorSeverity.ERROR,
 104                 Collections.singletonMap(DocumentedException.ErrorSeverity.ERROR.toString(), exception.toString()));
 105     }
 106
 107     private static Document executeOperationWithHighestPriority(final Document message,
 108             final NetconfOperationExecution netconfOperationExecution) throws DocumentedException {
 109         if (LOG.isDebugEnabled()) {
 110             LOG.debug("Forwarding netconf message {} to {}", XmlUtil.toString(message), netconfOperationExecution
 111                     .netconfOperation);
 112         }
 113
 114         return netconfOperationExecution.execute(message);
 115     }
 116
 117     private NetconfOperationExecution getNetconfOperationWithHighestPriority(
 118             final Document message, final NetconfServerSession session) throws DocumentedException {
 119
 120         final NavigableMap<HandlingPriority, NetconfOperation> sortedByPriority =
 121                 getSortedNetconfOperationsWithCanHandle(
 122                 message, session);
 123
 124         if (sortedByPriority.isEmpty()) {
 125             throw new IllegalArgumentException(String.format("No %s available to handle message %s",
 126                     NetconfOperation.class.getName(), XmlUtil.toString(message)));
 127         }
 128
 129         return NetconfOperationExecution.createExecutionChain(sortedByPriority, sortedByPriority.lastKey());
 130     }
 131
 132     private TreeMap<HandlingPriority, NetconfOperation> getSortedNetconfOperationsWithCanHandle(
 133             final Document message, final NetconfServerSession session) throws DocumentedException {
 134         final TreeMap<HandlingPriority, NetconfOperation> sortedPriority = new TreeMap<>();
 135
 136         for (final NetconfOperation netconfOperation : allNetconfOperations) {
 137             final HandlingPriority handlingPriority = netconfOperation.canHandle(message);
 138             if (netconfOperation instanceof DefaultNetconfOperation) {
 139                 ((DefaultNetconfOperation) netconfOperation).setNetconfSession(session);
 140             }
 141             if (netconfOperation instanceof SessionAwareNetconfOperation) {
 142                 ((SessionAwareNetconfOperation) netconfOperation).setSession(session);
 143             }
 144             if (!handlingPriority.equals(HandlingPriority.CANNOT_HANDLE)) {
 145
 146                 checkState(!sortedPriority.containsKey(handlingPriority),
 147                         "Multiple %s available to handle message %s with priority %s, %s and %s",
 148                         NetconfOperation.class.getName(), message, handlingPriority, netconfOperation, sortedPriority
 149                                 .get(handlingPriority));
 150                 sortedPriority.put(handlingPriority, netconfOperation);
 151             }
 152         }
 153         return sortedPriority;
 154     }
 155
 156     private static final class NetconfOperationExecution implements NetconfOperationChainedExecution {
 157         private final NetconfOperation netconfOperation;
 158         private final NetconfOperationChainedExecution subsequentExecution;
 159
 160         private NetconfOperationExecution(final NetconfOperation netconfOperation,
 161                                           final NetconfOperationChainedExecution subsequentExecution) {
 162             this.netconfOperation = netconfOperation;
 163             this.subsequentExecution = subsequentExecution;
 164         }
 165
 166         @Override
 167         public boolean isExecutionTermination() {
 168             return false;
 169         }
 170
 171         @Override
 172         public Document execute(final Document message) throws DocumentedException {
 173             return netconfOperation.handle(message, subsequentExecution);
 174         }
 175
 176         public static NetconfOperationExecution createExecutionChain(
 177                 final NavigableMap<HandlingPriority, NetconfOperation> sortedByPriority,
 178                 final HandlingPriority handlingPriority) {
 179             final NetconfOperation netconfOperation = sortedByPriority.get(handlingPriority);
 180             final HandlingPriority subsequentHandlingPriority = sortedByPriority.lowerKey(handlingPriority);
 181
 182             NetconfOperationChainedExecution subsequentExecution = null;
 183
 184             if (subsequentHandlingPriority != null) {
 185                 subsequentExecution = createExecutionChain(sortedByPriority, subsequentHandlingPriority);
 186             } else {
 187                 subsequentExecution = EXECUTION_TERMINATION_POINT;
 188             }
 189
 190             return new NetconfOperationExecution(netconfOperation, subsequentExecution);
 191         }
 192     }
 193
 194     @Override
 195     public String toString() {
 196         return "NetconfOperationRouterImpl{" + "netconfOperationServiceSnapshot=" + netconfOperationServiceSnapshot
 197                 + '}';
 198     }
 199 }