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.DOMMountPoint;
  38 import org.opendaylight.mdsal.dom.api.DOMMountPointService;
  39 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  40 import org.opendaylight.restconf.common.context.InstanceIdentifierContext;
  41 import org.opendaylight.restconf.common.context.NormalizedNodeContext;
  42 import org.opendaylight.restconf.common.context.WriterParameters;
  43 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  44 import org.opendaylight.restconf.common.errors.RestconfError;
  45 import org.opendaylight.restconf.common.errors.RestconfError.ErrorTag;
  46 import org.opendaylight.restconf.common.errors.RestconfError.ErrorType;
  47 import org.opendaylight.restconf.common.patch.PatchContext;
  48 import org.opendaylight.restconf.common.patch.PatchStatusContext;
  49 import org.opendaylight.restconf.nb.rfc8040.Rfc8040;
  50 import org.opendaylight.restconf.nb.rfc8040.handlers.SchemaContextHandler;
  51 import org.opendaylight.restconf.nb.rfc8040.handlers.TransactionChainHandler;
  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 TransactionChainHandler transactionChainHandler;
 111     private final DOMMountPointService mountPointService;
 112     private final DOMActionService actionService;
 113
 114     public RestconfDataServiceImpl(final SchemaContextHandler schemaContextHandler,
 115             final TransactionChainHandler transactionChainHandler,
 116             final DOMMountPointService  mountPointService,
 117             final RestconfStreamsSubscriptionService delegRestconfSubscrService,
 118             final DOMActionService actionService,
 119             final Configuration configuration) {
 120         this.actionService = requireNonNull(actionService);
 121         this.schemaContextHandler = requireNonNull(schemaContextHandler);
 122         this.transactionChainHandler = requireNonNull(transactionChainHandler);
 123         this.mountPointService = requireNonNull(mountPointService);
 124         this.delegRestconfSubscrService = requireNonNull(delegRestconfSubscrService);
 125         streamUtils = configuration.isUseSSE() ? SubscribeToStreamUtil.serverSentEvents()
 126                 : SubscribeToStreamUtil.webSockets();
 127     }
 128
 129     @Override
 130     public Response readData(final UriInfo uriInfo) {
 131         return readData(null, uriInfo);
 132     }
 133
 134     @Override
 135     public Response readData(final String identifier, final UriInfo uriInfo) {
 136         final EffectiveModelContext schemaContextRef = this.schemaContextHandler.get();
 137         final InstanceIdentifierContext<?> instanceIdentifier = ParserIdentifier.toInstanceIdentifier(
 138                 identifier, schemaContextRef, Optional.of(mountPointService));
 139         final WriterParameters parameters = ReadDataTransactionUtil.parseUriParameters(instanceIdentifier, uriInfo);
 140
 141         final DOMMountPoint mountPoint = instanceIdentifier.getMountPoint();
 142         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 143         final NormalizedNode<?, ?> node;
 144         if (parameters.getFieldPaths() != null && !parameters.getFieldPaths().isEmpty()) {
 145             node = ReadDataTransactionUtil.readData(parameters.getContent(), instanceIdentifier.getInstanceIdentifier(),
 146                     strategy, parameters.getWithDefault(), schemaContextRef, parameters.getFieldPaths());
 147         } else {
 148             node = readData(identifier, parameters.getContent(), instanceIdentifier.getInstanceIdentifier(), strategy,
 149                     parameters.getWithDefault(), schemaContextRef, uriInfo);
 150         }
 151         if (identifier != null && identifier.contains(STREAM_PATH) && identifier.contains(STREAM_ACCESS_PATH_PART)
 152                 && identifier.contains(STREAM_LOCATION_PATH_PART)) {
 153             final String value = (String) node.getValue();
 154             final String streamName = value.substring(value.indexOf(NOTIFICATION_STREAM + '/'));
 155             this.delegRestconfSubscrService.subscribeToStream(streamName, uriInfo);
 156         }
 157         if (node == null) {
 158             throw new RestconfDocumentedException(
 159                     "Request could not be completed because the relevant data model content does not exist",
 160                     RestconfError.ErrorType.PROTOCOL,
 161                     RestconfError.ErrorTag.DATA_MISSING);
 162         }
 163
 164         if (parameters.getContent().equals(RestconfDataServiceConstant.ReadData.ALL)
 165                     || parameters.getContent().equals(RestconfDataServiceConstant.ReadData.CONFIG)) {
 166             final QName type = node.getNodeType();
 167             return Response.status(200)
 168                     .entity(new NormalizedNodeContext(instanceIdentifier, node, parameters))
 169                     .header("ETag", '"' + type.getModule().getRevision().map(Revision::toString).orElse(null)
 170                         + "-" + type.getLocalName() + '"')
 171                     .header("Last-Modified", FORMATTER.format(LocalDateTime.now(Clock.systemUTC())))
 172                     .build();
 173         }
 174
 175         return Response.status(200).entity(new NormalizedNodeContext(instanceIdentifier, node, parameters)).build();
 176     }
 177
 178     /**
 179      * Read specific type of data from data store via transaction and if identifier read data from
 180      * streams then put streams from actual schema context to datastore.
 181      *
 182      * @param identifier    identifier of data to read
 183      * @param content       type of data to read (config, state, all)
 184      * @param strategy      {@link RestconfStrategy} - object that perform the actual DS operations
 185      * @param withDefa      value of with-defaults parameter
 186      * @param schemaContext schema context
 187      * @param uriInfo       uri info
 188      * @return {@link NormalizedNode}
 189      */
 190     private NormalizedNode<?, ?> readData(final String identifier, final String content,
 191             final YangInstanceIdentifier path, final RestconfStrategy strategy, final String withDefa,
 192             final EffectiveModelContext schemaContext, final UriInfo uriInfo) {
 193         if (identifier != null && identifier.contains(STREAMS_PATH) && !identifier.contains(STREAM_PATH_PART)) {
 194             createAllYangNotificationStreams(strategy, schemaContext, uriInfo);
 195         }
 196         return ReadDataTransactionUtil.readData(content, path, strategy, withDefa, schemaContext);
 197     }
 198
 199     private void createAllYangNotificationStreams(final RestconfStrategy strategy,
 200             final EffectiveModelContext schemaContext, final UriInfo uriInfo) {
 201         final RestconfTransaction transaction = strategy.prepareWriteExecution();
 202
 203         for (final NotificationDefinition notificationDefinition : schemaContext.getNotifications()) {
 204             final NotificationListenerAdapter notifiStreamXML =
 205                 CreateStreamUtil.createYangNotifiStream(notificationDefinition, schemaContext,
 206                     NotificationOutputType.XML);
 207             final NotificationListenerAdapter notifiStreamJSON =
 208                 CreateStreamUtil.createYangNotifiStream(notificationDefinition, schemaContext,
 209                     NotificationOutputType.JSON);
 210             writeNotificationStreamToDatastore(schemaContext, uriInfo, transaction, notifiStreamXML);
 211             writeNotificationStreamToDatastore(schemaContext, uriInfo, transaction, notifiStreamJSON);
 212         }
 213         try {
 214             transaction.commit().get();
 215         } catch (final InterruptedException | ExecutionException e) {
 216             throw new RestconfDocumentedException("Problem while putting data to DS.", e);
 217         }
 218     }
 219
 220     private void writeNotificationStreamToDatastore(final EffectiveModelContext schemaContext,
 221             final UriInfo uriInfo, final RestconfTransaction transaction, final NotificationListenerAdapter listener) {
 222         final URI uri = streamUtils.prepareUriByStreamName(uriInfo, listener.getStreamName());
 223         final MapEntryNode mapToStreams = RestconfMappingNodeUtil.mapYangNotificationStreamByIetfRestconfMonitoring(
 224                 listener.getSchemaPath().lastNodeIdentifier(), schemaContext.getNotifications(), null,
 225                 listener.getOutputType(), uri);
 226
 227         final String name = listener.getSchemaPath().lastNodeIdentifier().getLocalName();
 228         transaction.merge(LogicalDatastoreType.OPERATIONAL,
 229             IdentifierCodec.deserialize(Rfc8040.MonitoringModule.PATH_TO_STREAM_WITHOUT_KEY + name, schemaContext),
 230             mapToStreams);
 231     }
 232
 233     @Override
 234     public Response putData(final String identifier, final NormalizedNodeContext payload, final UriInfo uriInfo) {
 235         requireNonNull(payload);
 236
 237         final QueryParams checkedParms = checkQueryParameters(uriInfo);
 238
 239         final InstanceIdentifierContext<? extends SchemaNode> iid = payload.getInstanceIdentifierContext();
 240
 241         PutDataTransactionUtil.validInputData(iid.getSchemaNode(), payload);
 242         PutDataTransactionUtil.validTopLevelNodeName(iid.getInstanceIdentifier(), payload);
 243         PutDataTransactionUtil.validateListKeysEqualityInPayloadAndUri(payload);
 244
 245         final DOMMountPoint mountPoint = payload.getInstanceIdentifierContext().getMountPoint();
 246         final EffectiveModelContext ref = mountPoint == null
 247                 ? this.schemaContextHandler.get() : modelContext(mountPoint);
 248
 249         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 250         return PutDataTransactionUtil.putData(payload, ref, strategy, checkedParms.insert, checkedParms.point);
 251     }
 252
 253     private static QueryParams checkQueryParameters(final UriInfo uriInfo) {
 254         boolean insertUsed = false;
 255         boolean pointUsed = false;
 256         Insert insert = null;
 257         String point = null;
 258
 259         for (final Entry<String, List<String>> entry : uriInfo.getQueryParameters().entrySet()) {
 260             switch (entry.getKey()) {
 261                 case INSERT:
 262                     if (insertUsed) {
 263                         throw new RestconfDocumentedException("Insert parameter can be used only once.",
 264                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 265                     }
 266
 267                     insertUsed = true;
 268                     final String str = entry.getValue().get(0);
 269                     insert = Insert.forValue(str);
 270                     if (insert == null) {
 271                         throw new RestconfDocumentedException("Unrecognized insert parameter value '" + str + "'",
 272                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 273                     }
 274                     break;
 275                 case POINT:
 276                     if (pointUsed) {
 277                         throw new RestconfDocumentedException("Point parameter can be used only once.",
 278                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 279                     }
 280
 281                     pointUsed = true;
 282                     point = entry.getValue().get(0);
 283                     break;
 284                 default:
 285                     throw new RestconfDocumentedException("Bad parameter for post: " + entry.getKey(),
 286                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 287             }
 288         }
 289
 290         checkQueryParams(insertUsed, pointUsed, insert);
 291         return new QueryParams(insert, point);
 292     }
 293
 294     private static void checkQueryParams(final boolean insertUsed, final boolean pointUsed, final Insert insert) {
 295         if (pointUsed) {
 296             if (!insertUsed) {
 297                 throw new RestconfDocumentedException("Point parameter can't be used without Insert parameter.",
 298                     RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 299             }
 300
 301             if (insert != Insert.BEFORE && insert != Insert.AFTER) {
 302                 throw new RestconfDocumentedException(
 303                     "Point parameter can be used only with 'after' or 'before' values of Insert parameter.",
 304                     RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 305             }
 306         }
 307     }
 308
 309     @Override
 310     public Response postData(final String identifier, final NormalizedNodeContext payload, final UriInfo uriInfo) {
 311         return postData(payload, uriInfo);
 312     }
 313
 314     @Override
 315     public Response postData(final NormalizedNodeContext payload, final UriInfo uriInfo) {
 316         requireNonNull(payload);
 317         if (payload.getInstanceIdentifierContext().getSchemaNode() instanceof ActionDefinition) {
 318             return invokeAction(payload);
 319         }
 320
 321         final QueryParams checkedParms = checkQueryParameters(uriInfo);
 322         final DOMMountPoint mountPoint = payload.getInstanceIdentifierContext().getMountPoint();
 323         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 324         return PostDataTransactionUtil.postData(uriInfo, payload, strategy,
 325                 getSchemaContext(mountPoint), checkedParms.insert, checkedParms.point);
 326     }
 327
 328     @Override
 329     public Response deleteData(final String identifier) {
 330         final InstanceIdentifierContext<?> instanceIdentifier = ParserIdentifier.toInstanceIdentifier(
 331                 identifier, this.schemaContextHandler.get(), Optional.of(mountPointService));
 332
 333         final DOMMountPoint mountPoint = instanceIdentifier.getMountPoint();
 334         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 335         return DeleteDataTransactionUtil.deleteData(strategy, instanceIdentifier.getInstanceIdentifier());
 336     }
 337
 338     @Override
 339     public PatchStatusContext patchData(final String identifier, final PatchContext context, final UriInfo uriInfo) {
 340         return patchData(context, uriInfo);
 341     }
 342
 343     @Override
 344     public PatchStatusContext patchData(final PatchContext context, final UriInfo uriInfo) {
 345         final DOMMountPoint mountPoint = requireNonNull(context).getInstanceIdentifierContext().getMountPoint();
 346         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 347         return PatchDataTransactionUtil.patchData(context, strategy, getSchemaContext(mountPoint));
 348     }
 349
 350     @Override
 351     public Response patchData(final String identifier, final NormalizedNodeContext payload, final UriInfo uriInfo) {
 352         requireNonNull(payload);
 353
 354         final InstanceIdentifierContext<? extends SchemaNode> iid = payload
 355                 .getInstanceIdentifierContext();
 356
 357         PutDataTransactionUtil.validInputData(iid.getSchemaNode(), payload);
 358         PutDataTransactionUtil.validTopLevelNodeName(iid.getInstanceIdentifier(), payload);
 359         PutDataTransactionUtil.validateListKeysEqualityInPayloadAndUri(payload);
 360
 361         final DOMMountPoint mountPoint = payload.getInstanceIdentifierContext().getMountPoint();
 362         final EffectiveModelContext ref = mountPoint == null
 363                 ? this.schemaContextHandler.get() : modelContext(mountPoint);
 364         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 365
 366         return PlainPatchDataTransactionUtil.patchData(payload, strategy, ref);
 367     }
 368
 369     private EffectiveModelContext getSchemaContext(final DOMMountPoint mountPoint) {
 370         return mountPoint == null ? schemaContextHandler.get() : modelContext(mountPoint);
 371     }
 372
 373     // FIXME: why is this synchronized?
 374     public synchronized RestconfStrategy getRestconfStrategy(final DOMMountPoint mountPoint) {
 375         if (mountPoint == null) {
 376             return new MdsalRestconfStrategy(transactionChainHandler);
 377         }
 378
 379         return RestconfStrategy.forMountPoint(mountPoint).orElseThrow(() -> {
 380             LOG.warn("Mount point {} does not expose a suitable access interface", mountPoint.getIdentifier());
 381             return new RestconfDocumentedException("Could not find a supported access interface in mount point "
 382                 + mountPoint.getIdentifier());
 383         });
 384     }
 385
 386     /**
 387      * Invoke Action operation.
 388      *
 389      * @param payload {@link NormalizedNodeContext} - the body of the operation
 390      * @return {@link NormalizedNodeContext} wrapped in {@link Response}
 391      */
 392     public Response invokeAction(final NormalizedNodeContext payload) {
 393         final InstanceIdentifierContext<?> context = payload.getInstanceIdentifierContext();
 394         final DOMMountPoint mountPoint = context.getMountPoint();
 395         final Absolute schemaPath = Absolute.of(ImmutableList.copyOf(context.getSchemaNode().getPath()
 396             .getPathFromRoot()));
 397         final YangInstanceIdentifier yangIIdContext = context.getInstanceIdentifier();
 398         final NormalizedNode<?, ?> data = payload.getData();
 399
 400         if (yangIIdContext.isEmpty() && !RestconfDataServiceConstant.NETCONF_BASE_QNAME.equals(data.getNodeType())) {
 401             throw new RestconfDocumentedException("Instance identifier need to contain at least one path argument",
 402                 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
 403         }
 404
 405         final DOMActionResult response;
 406         final EffectiveModelContext schemaContextRef;
 407         if (mountPoint != null) {
 408             response = RestconfInvokeOperationsUtil.invokeActionViaMountPoint(mountPoint, (ContainerNode) data,
 409                 schemaPath, yangIIdContext);
 410             schemaContextRef = modelContext(mountPoint);
 411         } else {
 412             response = RestconfInvokeOperationsUtil.invokeAction((ContainerNode) data, schemaPath,
 413                 this.actionService, yangIIdContext);
 414             schemaContextRef = this.schemaContextHandler.get();
 415         }
 416         final DOMActionResult result = RestconfInvokeOperationsUtil.checkActionResponse(response);
 417
 418         ActionDefinition resultNodeSchema = null;
 419         ContainerNode resultData = null;
 420         if (result != null) {
 421             final Optional<ContainerNode> optOutput = result.getOutput();
 422             if (optOutput.isPresent()) {
 423                 resultData = optOutput.get();
 424                 resultNodeSchema = (ActionDefinition) context.getSchemaNode();
 425             }
 426         }
 427
 428         if (resultData != null && resultData.getValue().isEmpty()) {
 429             throw new WebApplicationException(Response.Status.NO_CONTENT);
 430         }
 431
 432         return Response.status(200).entity(new NormalizedNodeContext(new InstanceIdentifierContext<>(yangIIdContext,
 433                 resultNodeSchema, mountPoint, schemaContextRef), resultData)).build();
 434     }
 435
 436     private static EffectiveModelContext modelContext(final DOMMountPoint mountPoint) {
 437         return mountPoint.getService(DOMSchemaService.class)
 438             .flatMap(svc -> Optional.ofNullable(svc.getGlobalContext()))
 439             .orElse(null);
 440     }
 441 }