restconf/sal-rest-connector/src/main/java/org/opendaylight/restconf/restful/utils/CreateStreamUtil.java

   1 /*
   2  * Copyright (c) 2016 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.restconf.restful.utils;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.util.concurrent.CheckedFuture;
  13 import java.util.ArrayList;
  14 import java.util.Collection;
  15 import java.util.Iterator;
  16 import java.util.List;
  17 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataBroker.DataChangeScope;
  18 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  19 import org.opendaylight.controller.md.sal.dom.api.DOMRpcResult;
  20 import org.opendaylight.controller.md.sal.dom.spi.DefaultDOMRpcResult;
  21 import org.opendaylight.netconf.sal.restconf.impl.NormalizedNodeContext;
  22 import org.opendaylight.netconf.sal.restconf.impl.RestconfDocumentedException;
  23 import org.opendaylight.netconf.sal.restconf.impl.RestconfError.ErrorTag;
  24 import org.opendaylight.netconf.sal.restconf.impl.RestconfError.ErrorType;
  25 import org.opendaylight.netconf.sal.streams.listeners.Notificator;
  26 import org.opendaylight.restconf.common.references.SchemaContextRef;
  27 import org.opendaylight.restconf.utils.parser.ParserIdentifier;
  28 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
  29 import org.opendaylight.yangtools.yang.common.QName;
  30 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  33 import org.opendaylight.yangtools.yang.data.api.schema.AugmentationNode;
  34 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  35 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  36 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetEntryNode;
  37 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
  38 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  39 import org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableContainerNodeBuilder;
  40 import org.opendaylight.yangtools.yang.model.api.Module;
  41 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
  42 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  43 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  44 import org.slf4j.Logger;
  45 import org.slf4j.LoggerFactory;
  46
  47 /**
  48  * Util class for streams
  49  *
  50  * <ul>
  51  * <li>create stream
  52  * <li>subscribe
  53  * </ul>
  54  *
  55  */
  56 public final class CreateStreamUtil {
  57
  58     private static final Logger LOG = LoggerFactory.getLogger(CreateStreamUtil.class);
  59     private static final String OUTPUT_TYPE_PARAM_NAME = "notification-output-type";
  60
  61     private CreateStreamUtil() {
  62         throw new UnsupportedOperationException("Util class");
  63     }
  64
  65     /**
  66      * Create stream with POST operation via RPC
  67      *
  68      * @param payload
  69      *            - input of rpc - example in JSON:
  70      *
  71      *            <pre>
  72      *            {@code
  73      *            {
  74      *                "input": {
  75      *                    "path": "/toaster:toaster/toaster:toasterStatus",
  76      *                    "sal-remote-augment:datastore": "OPERATIONAL",
  77      *                    "sal-remote-augment:scope": "ONE"
  78      *                }
  79      *            }
  80      *            }
  81      *            </pre>
  82      *
  83      * @param refSchemaCtx
  84      *            - reference to {@link SchemaContext} -
  85      *            {@link SchemaContextRef}
  86      * @return {@link CheckedFuture} with {@link DOMRpcResult} - This mean
  87      *         output of RPC - example in JSON:
  88      *
  89      *         <pre>
  90      *         {@code
  91      *         {
  92      *             "output": {
  93      *                 "stream-name": "toaster:toaster/toaster:toasterStatus/datastore=OPERATIONAL/scope=ONE"
  94      *             }
  95      *         }
  96      *         }
  97      *         </pre>
  98      *
  99      */
 100     public static DOMRpcResult createDataChangeNotifiStream(final NormalizedNodeContext payload,
 101             final SchemaContextRef refSchemaCtx) {
 102         final ContainerNode data = (ContainerNode) payload.getData();
 103         final QName qname = payload.getInstanceIdentifierContext().getSchemaNode().getQName();
 104         final YangInstanceIdentifier path = preparePath(data, qname);
 105         final String streamName = prepareDataChangeNotifiStreamName(path, refSchemaCtx.get(), data);
 106
 107         final QName outputQname = QName.create(qname, "output");
 108         final QName streamNameQname = QName.create(qname, "stream-name");
 109
 110         final ContainerNode output = ImmutableContainerNodeBuilder.create()
 111                 .withNodeIdentifier(new NodeIdentifier(outputQname))
 112                 .withChild(ImmutableNodes.leafNode(streamNameQname, streamName)).build();
 113         final NotificationOutputType outputType = prepareOutputType(data);
 114
 115         if (!Notificator.existListenerFor(streamName)) {
 116             Notificator.createListener(path, streamName, outputType);
 117         }
 118
 119         return new DefaultDOMRpcResult(output);
 120     }
 121
 122     /**
 123      * @param data
 124      *            - data of notification
 125      * @return output type fo notification
 126      */
 127     private static NotificationOutputType prepareOutputType(final ContainerNode data) {
 128         NotificationOutputType outputType = parseEnum(data, NotificationOutputType.class, OUTPUT_TYPE_PARAM_NAME);
 129         return outputType = outputType == null ? NotificationOutputType.XML : outputType;
 130     }
 131
 132     private static String prepareDataChangeNotifiStreamName(final YangInstanceIdentifier path, final SchemaContext schemaContext,
 133             final ContainerNode data) {
 134         LogicalDatastoreType ds = parseEnum(data, LogicalDatastoreType.class,
 135                 RestconfStreamsConstants.DATASTORE_PARAM_NAME);
 136         ds = ds == null ? RestconfStreamsConstants.DEFAULT_DS : ds;
 137
 138         DataChangeScope scope = parseEnum(data, DataChangeScope.class, RestconfStreamsConstants.SCOPE_PARAM_NAME);
 139         scope = scope == null ? RestconfStreamsConstants.DEFAULT_SCOPE : scope;
 140
 141         final String streamName = RestconfStreamsConstants.DATA_SUBSCR + "/"
 142                 + Notificator
 143                 .createStreamNameFromUri(ParserIdentifier.stringFromYangInstanceIdentifier(path, schemaContext)
 144                 + RestconfStreamsConstants.DS_URI + ds + RestconfStreamsConstants.SCOPE_URI + scope);
 145         return streamName;
 146     }
 147
 148     private static <T> T parseEnum(final ContainerNode data, final Class<T> clazz, final String paramName) {
 149         final Optional<DataContainerChild<? extends PathArgument, ?>> augNode = data
 150                 .getChild(RestconfStreamsConstants.SAL_REMOTE_AUG_IDENTIFIER);
 151         if (!augNode.isPresent() && !(augNode instanceof AugmentationNode)) {
 152             return null;
 153         }
 154         final Optional<DataContainerChild<? extends PathArgument, ?>> enumNode =
 155                 ((AugmentationNode) augNode.get()).getChild(
 156                         new NodeIdentifier(QName.create(RestconfStreamsConstants.SAL_REMOTE_AUGMENT, paramName)));
 157         if (!enumNode.isPresent()) {
 158             return null;
 159         }
 160         final Object value = enumNode.get().getValue();
 161         if (!(value instanceof String)) {
 162             return null;
 163         }
 164
 165         return ResolveEnumUtil.resolveEnum(clazz, (String) value);
 166     }
 167
 168     private static YangInstanceIdentifier preparePath(final ContainerNode data, final QName qName) {
 169         final Optional<DataContainerChild<? extends PathArgument, ?>> path = data
 170                 .getChild(new YangInstanceIdentifier.NodeIdentifier(QName.create(qName, "path")));
 171         Object pathValue = null;
 172         if (path.isPresent()) {
 173             pathValue = path.get().getValue();
 174         }
 175         if (!(pathValue instanceof YangInstanceIdentifier)) {
 176             final String errMsg = "Instance identifier was not normalized correctly ";
 177             LOG.debug(errMsg + qName);
 178             throw new RestconfDocumentedException(errMsg, ErrorType.APPLICATION, ErrorTag.OPERATION_FAILED);
 179         }
 180         return (YangInstanceIdentifier) pathValue;
 181     }
 182
 183     /**
 184      * Create stream with POST operation via RPC
 185      *
 186      * @param payload
 187      *            - input of RPC
 188      * @param refSchemaCtx
 189      *            - schemaContext
 190      * @return {@link DOMRpcResult}
 191      */
 192     public static DOMRpcResult createYangNotifiStream(final NormalizedNodeContext payload,
 193             final SchemaContextRef refSchemaCtx) {
 194         final ContainerNode data = (ContainerNode) payload.getData();
 195         LeafSetNode leafSet = null;
 196         String outputType = "XML";
 197         for (final DataContainerChild<? extends PathArgument, ?> dataChild : data.getValue()) {
 198             if (dataChild instanceof LeafSetNode) {
 199                 leafSet = (LeafSetNode) dataChild;
 200             } else if (dataChild instanceof AugmentationNode) {
 201                 outputType = (String) (((AugmentationNode) dataChild).getValue()).iterator().next().getValue();
 202             }
 203         }
 204
 205         final Collection<LeafSetEntryNode> entryNodes = leafSet.getValue();
 206         final List<SchemaPath> paths = new ArrayList<>();
 207         String streamName = RestconfStreamsConstants.CREATE_NOTIFICATION_STREAM + "/";
 208
 209         final Iterator<LeafSetEntryNode> iterator = entryNodes.iterator();
 210         while (iterator.hasNext()) {
 211             final QName valueQName = QName.create((String) iterator.next().getValue());
 212             final Module module = refSchemaCtx.findModuleByNamespaceAndRevision(valueQName.getModule().getNamespace(),
 213                     valueQName.getModule().getRevision());
 214             Preconditions.checkNotNull(module,
 215                     "Module for namespace " + valueQName.getModule().getNamespace() + " does not exist");
 216             NotificationDefinition notifiDef = null;
 217             for (final NotificationDefinition notification : module.getNotifications()) {
 218                 if (notification.getQName().equals(valueQName)) {
 219                     notifiDef = notification;
 220                     break;
 221                 }
 222             }
 223             final String moduleName = module.getName();
 224             Preconditions.checkNotNull(notifiDef,
 225                     "Notification " + valueQName + "doesn't exist in module " + moduleName);
 226             paths.add(notifiDef.getPath());
 227             streamName = streamName + moduleName + ":" + valueQName.getLocalName();
 228             if (iterator.hasNext()) {
 229                 streamName = streamName + ",";
 230             }
 231         }
 232
 233         final QName rpcQName = payload.getInstanceIdentifierContext().getSchemaNode().getQName();
 234         final QName outputQname = QName.create(rpcQName, "output");
 235         final QName streamNameQname = QName.create(rpcQName, "notification-stream-identifier");
 236
 237         final ContainerNode output =
 238                 ImmutableContainerNodeBuilder.create().withNodeIdentifier(new NodeIdentifier(outputQname))
 239                         .withChild(ImmutableNodes.leafNode(streamNameQname, streamName)).build();
 240
 241         if (!Notificator.existNotificationListenerFor(streamName)) {
 242             Notificator.createNotificationListener(paths, streamName, outputType);
 243         }
 244
 245         return new DefaultDOMRpcResult(output);
 246     }
 247 }