restconf/restconf-nb-rfc8040/src/main/java/org/opendaylight/restconf/nb/rfc8040/rests/services/impl/RestconfDataServiceImpl.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.nb.rfc8040.rests.services.impl;
   9
  10 import static java.util.Objects.requireNonNull;
  11 import static org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfDataServiceConstant.PostPutQueryParameters.INSERT;
  12 import static org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfDataServiceConstant.PostPutQueryParameters.POINT;
  13 import static org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfStreamsConstants.NOTIFICATION_STREAM;
  14 import static org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfStreamsConstants.STREAMS_PATH;
  15 import static org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfStreamsConstants.STREAM_ACCESS_PATH_PART;
  16 import static org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfStreamsConstants.STREAM_LOCATION_PATH_PART;
  17 import static org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfStreamsConstants.STREAM_PATH;
  18 import static org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfStreamsConstants.STREAM_PATH_PART;
  19
  20 import com.google.common.collect.ImmutableList;
  21 import java.net.URI;
  22 import java.time.Clock;
  23 import java.time.LocalDateTime;
  24 import java.time.format.DateTimeFormatter;
  25 import java.util.List;
  26 import java.util.Map.Entry;
  27 import java.util.Optional;
  28 import java.util.concurrent.ExecutionException;
  29 import javax.ws.rs.Path;
  30 import javax.ws.rs.WebApplicationException;
  31 import javax.ws.rs.core.Response;
  32 import javax.ws.rs.core.UriInfo;
  33 import org.eclipse.jdt.annotation.Nullable;
  34 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  35 import org.opendaylight.mdsal.dom.api.DOMActionResult;
  36 import org.opendaylight.mdsal.dom.api.DOMActionService;
  37 import org.opendaylight.mdsal.dom.api.DOMDataBroker;
  38 import org.opendaylight.mdsal.dom.api.DOMMountPoint;
  39 import org.opendaylight.mdsal.dom.api.DOMMountPointService;
  40 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  41 import org.opendaylight.restconf.common.context.InstanceIdentifierContext;
  42 import org.opendaylight.restconf.common.context.NormalizedNodeContext;
  43 import org.opendaylight.restconf.common.context.WriterParameters;
  44 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  45 import org.opendaylight.restconf.common.errors.RestconfError;
  46 import org.opendaylight.restconf.common.errors.RestconfError.ErrorTag;
  47 import org.opendaylight.restconf.common.errors.RestconfError.ErrorType;
  48 import org.opendaylight.restconf.common.patch.PatchContext;
  49 import org.opendaylight.restconf.common.patch.PatchStatusContext;
  50 import org.opendaylight.restconf.nb.rfc8040.Rfc8040;
  51 import org.opendaylight.restconf.nb.rfc8040.handlers.SchemaContextHandler;
  52 import org.opendaylight.restconf.nb.rfc8040.rests.services.api.RestconfDataService;
  53 import org.opendaylight.restconf.nb.rfc8040.rests.services.api.RestconfStreamsSubscriptionService;
  54 import org.opendaylight.restconf.nb.rfc8040.rests.transactions.MdsalRestconfStrategy;
  55 import org.opendaylight.restconf.nb.rfc8040.rests.transactions.RestconfStrategy;
  56 import org.opendaylight.restconf.nb.rfc8040.rests.transactions.RestconfTransaction;
  57 import org.opendaylight.restconf.nb.rfc8040.rests.utils.DeleteDataTransactionUtil;
  58 import org.opendaylight.restconf.nb.rfc8040.rests.utils.PatchDataTransactionUtil;
  59 import org.opendaylight.restconf.nb.rfc8040.rests.utils.PlainPatchDataTransactionUtil;
  60 import org.opendaylight.restconf.nb.rfc8040.rests.utils.PostDataTransactionUtil;
  61 import org.opendaylight.restconf.nb.rfc8040.rests.utils.PutDataTransactionUtil;
  62 import org.opendaylight.restconf.nb.rfc8040.rests.utils.ReadDataTransactionUtil;
  63 import org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfDataServiceConstant;
  64 import org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfDataServiceConstant.PostPutQueryParameters.Insert;
  65 import org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfInvokeOperationsUtil;
  66 import org.opendaylight.restconf.nb.rfc8040.streams.Configuration;
  67 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.NotificationListenerAdapter;
  68 import org.opendaylight.restconf.nb.rfc8040.utils.mapping.RestconfMappingNodeUtil;
  69 import org.opendaylight.restconf.nb.rfc8040.utils.parser.IdentifierCodec;
  70 import org.opendaylight.restconf.nb.rfc8040.utils.parser.ParserIdentifier;
  71 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
  72 import org.opendaylight.yangtools.concepts.Immutable;
  73 import org.opendaylight.yangtools.yang.common.QName;
  74 import org.opendaylight.yangtools.yang.common.Revision;
  75 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  76 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  77 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  78 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  79 import org.opendaylight.yangtools.yang.model.api.ActionDefinition;
  80 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  81 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
  82 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
  83 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
  84 import org.slf4j.Logger;
  85 import org.slf4j.LoggerFactory;
  86
  87 /**
  88  * Implementation of {@link RestconfDataService}.
  89  */
  90 @Path("/")
  91 public class RestconfDataServiceImpl implements RestconfDataService {
  92     // FIXME: we should be able to interpret 'point' and refactor this class into a behavior
  93     private static final class QueryParams implements Immutable {
  94         final @Nullable String point;
  95         final @Nullable Insert insert;
  96
  97         QueryParams(final @Nullable Insert insert, final @Nullable String point) {
  98             this.insert = insert;
  99             this.point = point;
 100         }
 101     }
 102
 103     private static final Logger LOG = LoggerFactory.getLogger(RestconfDataServiceImpl.class);
 104     private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("yyyy-MMM-dd HH:mm:ss");
 105
 106     private final RestconfStreamsSubscriptionService delegRestconfSubscrService;
 107     private final SubscribeToStreamUtil streamUtils;
 108
 109     private final SchemaContextHandler schemaContextHandler;
 110     private final DOMMountPointService mountPointService;
 111     private final DOMActionService actionService;
 112     private final DOMDataBroker dataBroker;
 113
 114     public RestconfDataServiceImpl(final SchemaContextHandler schemaContextHandler,
 115             final DOMDataBroker dataBroker, final DOMMountPointService  mountPointService,
 116             final RestconfStreamsSubscriptionService delegRestconfSubscrService,
 117             final DOMActionService actionService, final Configuration configuration) {
 118         this.schemaContextHandler = requireNonNull(schemaContextHandler);
 119         this.dataBroker = requireNonNull(dataBroker);
 120         this.mountPointService = requireNonNull(mountPointService);
 121         this.delegRestconfSubscrService = requireNonNull(delegRestconfSubscrService);
 122         this.actionService = requireNonNull(actionService);
 123         streamUtils = configuration.isUseSSE() ? SubscribeToStreamUtil.serverSentEvents()
 124                 : SubscribeToStreamUtil.webSockets();
 125     }
 126
 127     @Override
 128     public Response readData(final UriInfo uriInfo) {
 129         return readData(null, uriInfo);
 130     }
 131
 132     @Override
 133     public Response readData(final String identifier, final UriInfo uriInfo) {
 134         final EffectiveModelContext schemaContextRef = this.schemaContextHandler.get();
 135         final InstanceIdentifierContext<?> instanceIdentifier = ParserIdentifier.toInstanceIdentifier(
 136                 identifier, schemaContextRef, Optional.of(mountPointService));
 137         final WriterParameters parameters = ReadDataTransactionUtil.parseUriParameters(instanceIdentifier, uriInfo);
 138
 139         final DOMMountPoint mountPoint = instanceIdentifier.getMountPoint();
 140         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 141         final NormalizedNode<?, ?> node;
 142         if (parameters.getFieldPaths() != null && !parameters.getFieldPaths().isEmpty()) {
 143             node = ReadDataTransactionUtil.readData(parameters.getContent(), instanceIdentifier.getInstanceIdentifier(),
 144                     strategy, parameters.getWithDefault(), schemaContextRef, parameters.getFieldPaths());
 145         } else {
 146             node = readData(identifier, parameters.getContent(), instanceIdentifier.getInstanceIdentifier(), strategy,
 147                     parameters.getWithDefault(), schemaContextRef, uriInfo);
 148         }
 149         if (identifier != null && identifier.contains(STREAM_PATH) && identifier.contains(STREAM_ACCESS_PATH_PART)
 150                 && identifier.contains(STREAM_LOCATION_PATH_PART)) {
 151             final String value = (String) node.getValue();
 152             final String streamName = value.substring(value.indexOf(NOTIFICATION_STREAM + '/'));
 153             this.delegRestconfSubscrService.subscribeToStream(streamName, uriInfo);
 154         }
 155         if (node == null) {
 156             throw new RestconfDocumentedException(
 157                     "Request could not be completed because the relevant data model content does not exist",
 158                     RestconfError.ErrorType.PROTOCOL,
 159                     RestconfError.ErrorTag.DATA_MISSING);
 160         }
 161
 162         if (parameters.getContent().equals(RestconfDataServiceConstant.ReadData.ALL)
 163                     || parameters.getContent().equals(RestconfDataServiceConstant.ReadData.CONFIG)) {
 164             final QName type = node.getNodeType();
 165             return Response.status(200)
 166                     .entity(new NormalizedNodeContext(instanceIdentifier, node, parameters))
 167                     .header("ETag", '"' + type.getModule().getRevision().map(Revision::toString).orElse(null)
 168                         + "-" + type.getLocalName() + '"')
 169                     .header("Last-Modified", FORMATTER.format(LocalDateTime.now(Clock.systemUTC())))
 170                     .build();
 171         }
 172
 173         return Response.status(200).entity(new NormalizedNodeContext(instanceIdentifier, node, parameters)).build();
 174     }
 175
 176     /**
 177      * Read specific type of data from data store via transaction and if identifier read data from
 178      * streams then put streams from actual schema context to datastore.
 179      *
 180      * @param identifier    identifier of data to read
 181      * @param content       type of data to read (config, state, all)
 182      * @param strategy      {@link RestconfStrategy} - object that perform the actual DS operations
 183      * @param withDefa      value of with-defaults parameter
 184      * @param schemaContext schema context
 185      * @param uriInfo       uri info
 186      * @return {@link NormalizedNode}
 187      */
 188     private NormalizedNode<?, ?> readData(final String identifier, final String content,
 189             final YangInstanceIdentifier path, final RestconfStrategy strategy, final String withDefa,
 190             final EffectiveModelContext schemaContext, final UriInfo uriInfo) {
 191         if (identifier != null && identifier.contains(STREAMS_PATH) && !identifier.contains(STREAM_PATH_PART)) {
 192             createAllYangNotificationStreams(strategy, schemaContext, uriInfo);
 193         }
 194         return ReadDataTransactionUtil.readData(content, path, strategy, withDefa, schemaContext);
 195     }
 196
 197     private void createAllYangNotificationStreams(final RestconfStrategy strategy,
 198             final EffectiveModelContext schemaContext, final UriInfo uriInfo) {
 199         final RestconfTransaction transaction = strategy.prepareWriteExecution();
 200
 201         for (final NotificationDefinition notificationDefinition : schemaContext.getNotifications()) {
 202             final NotificationListenerAdapter notifiStreamXML =
 203                 CreateStreamUtil.createYangNotifiStream(notificationDefinition, schemaContext,
 204                     NotificationOutputType.XML);
 205             final NotificationListenerAdapter notifiStreamJSON =
 206                 CreateStreamUtil.createYangNotifiStream(notificationDefinition, schemaContext,
 207                     NotificationOutputType.JSON);
 208             writeNotificationStreamToDatastore(schemaContext, uriInfo, transaction, notifiStreamXML);
 209             writeNotificationStreamToDatastore(schemaContext, uriInfo, transaction, notifiStreamJSON);
 210         }
 211         try {
 212             transaction.commit().get();
 213         } catch (final InterruptedException | ExecutionException e) {
 214             throw new RestconfDocumentedException("Problem while putting data to DS.", e);
 215         }
 216     }
 217
 218     private void writeNotificationStreamToDatastore(final EffectiveModelContext schemaContext,
 219             final UriInfo uriInfo, final RestconfTransaction transaction, final NotificationListenerAdapter listener) {
 220         final URI uri = streamUtils.prepareUriByStreamName(uriInfo, listener.getStreamName());
 221         final MapEntryNode mapToStreams = RestconfMappingNodeUtil.mapYangNotificationStreamByIetfRestconfMonitoring(
 222                 listener.getSchemaPath().lastNodeIdentifier(), schemaContext.getNotifications(), null,
 223                 listener.getOutputType(), uri);
 224
 225         final String name = listener.getSchemaPath().lastNodeIdentifier().getLocalName();
 226         transaction.merge(LogicalDatastoreType.OPERATIONAL,
 227             IdentifierCodec.deserialize(Rfc8040.MonitoringModule.PATH_TO_STREAM_WITHOUT_KEY + name, schemaContext),
 228             mapToStreams);
 229     }
 230
 231     @Override
 232     public Response putData(final String identifier, final NormalizedNodeContext payload, final UriInfo uriInfo) {
 233         requireNonNull(payload);
 234
 235         final QueryParams checkedParms = checkQueryParameters(uriInfo);
 236
 237         final InstanceIdentifierContext<? extends SchemaNode> iid = payload.getInstanceIdentifierContext();
 238
 239         PutDataTransactionUtil.validInputData(iid.getSchemaNode(), payload);
 240         PutDataTransactionUtil.validTopLevelNodeName(iid.getInstanceIdentifier(), payload);
 241         PutDataTransactionUtil.validateListKeysEqualityInPayloadAndUri(payload);
 242
 243         final DOMMountPoint mountPoint = payload.getInstanceIdentifierContext().getMountPoint();
 244         final EffectiveModelContext ref = mountPoint == null
 245                 ? this.schemaContextHandler.get() : modelContext(mountPoint);
 246
 247         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 248         return PutDataTransactionUtil.putData(payload, ref, strategy, checkedParms.insert, checkedParms.point);
 249     }
 250
 251     private static QueryParams checkQueryParameters(final UriInfo uriInfo) {
 252         boolean insertUsed = false;
 253         boolean pointUsed = false;
 254         Insert insert = null;
 255         String point = null;
 256
 257         for (final Entry<String, List<String>> entry : uriInfo.getQueryParameters().entrySet()) {
 258             switch (entry.getKey()) {
 259                 case INSERT:
 260                     if (insertUsed) {
 261                         throw new RestconfDocumentedException("Insert parameter can be used only once.",
 262                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 263                     }
 264
 265                     insertUsed = true;
 266                     final String str = entry.getValue().get(0);
 267                     insert = Insert.forValue(str);
 268                     if (insert == null) {
 269                         throw new RestconfDocumentedException("Unrecognized insert parameter value '" + str + "'",
 270                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 271                     }
 272                     break;
 273                 case POINT:
 274                     if (pointUsed) {
 275                         throw new RestconfDocumentedException("Point parameter can be used only once.",
 276                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 277                     }
 278
 279                     pointUsed = true;
 280                     point = entry.getValue().get(0);
 281                     break;
 282                 default:
 283                     throw new RestconfDocumentedException("Bad parameter for post: " + entry.getKey(),
 284                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 285             }
 286         }
 287
 288         checkQueryParams(insertUsed, pointUsed, insert);
 289         return new QueryParams(insert, point);
 290     }
 291
 292     private static void checkQueryParams(final boolean insertUsed, final boolean pointUsed, final Insert insert) {
 293         if (pointUsed) {
 294             if (!insertUsed) {
 295                 throw new RestconfDocumentedException("Point parameter can't be used without Insert parameter.",
 296                     RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 297             }
 298
 299             if (insert != Insert.BEFORE && insert != Insert.AFTER) {
 300                 throw new RestconfDocumentedException(
 301                     "Point parameter can be used only with 'after' or 'before' values of Insert parameter.",
 302                     RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 303             }
 304         }
 305     }
 306
 307     @Override
 308     public Response postData(final String identifier, final NormalizedNodeContext payload, final UriInfo uriInfo) {
 309         return postData(payload, uriInfo);
 310     }
 311
 312     @Override
 313     public Response postData(final NormalizedNodeContext payload, final UriInfo uriInfo) {
 314         requireNonNull(payload);
 315         if (payload.getInstanceIdentifierContext().getSchemaNode() instanceof ActionDefinition) {
 316             return invokeAction(payload);
 317         }
 318
 319         final QueryParams checkedParms = checkQueryParameters(uriInfo);
 320         final DOMMountPoint mountPoint = payload.getInstanceIdentifierContext().getMountPoint();
 321         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 322         return PostDataTransactionUtil.postData(uriInfo, payload, strategy,
 323                 getSchemaContext(mountPoint), checkedParms.insert, checkedParms.point);
 324     }
 325
 326     @Override
 327     public Response deleteData(final String identifier) {
 328         final InstanceIdentifierContext<?> instanceIdentifier = ParserIdentifier.toInstanceIdentifier(
 329                 identifier, this.schemaContextHandler.get(), Optional.of(mountPointService));
 330
 331         final DOMMountPoint mountPoint = instanceIdentifier.getMountPoint();
 332         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 333         return DeleteDataTransactionUtil.deleteData(strategy, instanceIdentifier.getInstanceIdentifier());
 334     }
 335
 336     @Override
 337     public PatchStatusContext patchData(final String identifier, final PatchContext context, final UriInfo uriInfo) {
 338         return patchData(context, uriInfo);
 339     }
 340
 341     @Override
 342     public PatchStatusContext patchData(final PatchContext context, final UriInfo uriInfo) {
 343         final DOMMountPoint mountPoint = requireNonNull(context).getInstanceIdentifierContext().getMountPoint();
 344         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 345         return PatchDataTransactionUtil.patchData(context, strategy, getSchemaContext(mountPoint));
 346     }
 347
 348     @Override
 349     public Response patchData(final String identifier, final NormalizedNodeContext payload, final UriInfo uriInfo) {
 350         requireNonNull(payload);
 351
 352         final InstanceIdentifierContext<? extends SchemaNode> iid = payload
 353                 .getInstanceIdentifierContext();
 354
 355         PutDataTransactionUtil.validInputData(iid.getSchemaNode(), payload);
 356         PutDataTransactionUtil.validTopLevelNodeName(iid.getInstanceIdentifier(), payload);
 357         PutDataTransactionUtil.validateListKeysEqualityInPayloadAndUri(payload);
 358
 359         final DOMMountPoint mountPoint = payload.getInstanceIdentifierContext().getMountPoint();
 360         final EffectiveModelContext ref = mountPoint == null
 361                 ? this.schemaContextHandler.get() : modelContext(mountPoint);
 362         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 363
 364         return PlainPatchDataTransactionUtil.patchData(payload, strategy, ref);
 365     }
 366
 367     private EffectiveModelContext getSchemaContext(final DOMMountPoint mountPoint) {
 368         return mountPoint == null ? schemaContextHandler.get() : modelContext(mountPoint);
 369     }
 370
 371     // FIXME: why is this synchronized?
 372     public synchronized RestconfStrategy getRestconfStrategy(final DOMMountPoint mountPoint) {
 373         if (mountPoint == null) {
 374             return new MdsalRestconfStrategy(dataBroker);
 375         }
 376
 377         return RestconfStrategy.forMountPoint(mountPoint).orElseThrow(() -> {
 378             LOG.warn("Mount point {} does not expose a suitable access interface", mountPoint.getIdentifier());
 379             return new RestconfDocumentedException("Could not find a supported access interface in mount point "
 380                 + mountPoint.getIdentifier());
 381         });
 382     }
 383
 384     /**
 385      * Invoke Action operation.
 386      *
 387      * @param payload {@link NormalizedNodeContext} - the body of the operation
 388      * @return {@link NormalizedNodeContext} wrapped in {@link Response}
 389      */
 390     public Response invokeAction(final NormalizedNodeContext payload) {
 391         final InstanceIdentifierContext<?> context = payload.getInstanceIdentifierContext();
 392         final DOMMountPoint mountPoint = context.getMountPoint();
 393         final Absolute schemaPath = Absolute.of(ImmutableList.copyOf(context.getSchemaNode().getPath()
 394             .getPathFromRoot()));
 395         final YangInstanceIdentifier yangIIdContext = context.getInstanceIdentifier();
 396         final NormalizedNode<?, ?> data = payload.getData();
 397
 398         if (yangIIdContext.isEmpty() && !RestconfDataServiceConstant.NETCONF_BASE_QNAME.equals(data.getNodeType())) {
 399             throw new RestconfDocumentedException("Instance identifier need to contain at least one path argument",
 400                 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
 401         }
 402
 403         final DOMActionResult response;
 404         final EffectiveModelContext schemaContextRef;
 405         if (mountPoint != null) {
 406             response = RestconfInvokeOperationsUtil.invokeActionViaMountPoint(mountPoint, (ContainerNode) data,
 407                 schemaPath, yangIIdContext);
 408             schemaContextRef = modelContext(mountPoint);
 409         } else {
 410             response = RestconfInvokeOperationsUtil.invokeAction((ContainerNode) data, schemaPath,
 411                 this.actionService, yangIIdContext);
 412             schemaContextRef = this.schemaContextHandler.get();
 413         }
 414         final DOMActionResult result = RestconfInvokeOperationsUtil.checkActionResponse(response);
 415
 416         ActionDefinition resultNodeSchema = null;
 417         ContainerNode resultData = null;
 418         if (result != null) {
 419             final Optional<ContainerNode> optOutput = result.getOutput();
 420             if (optOutput.isPresent()) {
 421                 resultData = optOutput.get();
 422                 resultNodeSchema = (ActionDefinition) context.getSchemaNode();
 423             }
 424         }
 425
 426         if (resultData != null && resultData.getValue().isEmpty()) {
 427             throw new WebApplicationException(Response.Status.NO_CONTENT);
 428         }
 429
 430         return Response.status(200).entity(new NormalizedNodeContext(new InstanceIdentifierContext<>(yangIIdContext,
 431                 resultNodeSchema, mountPoint, schemaContextRef), resultData)).build();
 432     }
 433
 434     private static EffectiveModelContext modelContext(final DOMMountPoint mountPoint) {
 435         return mountPoint.getService(DOMSchemaService.class)
 436             .flatMap(svc -> Optional.ofNullable(svc.getGlobalContext()))
 437             .orElse(null);
 438     }
 439 }