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.core.Response;
  31 import javax.ws.rs.core.Response.Status;
  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.DOMMountPoint;
  37 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  38 import org.opendaylight.restconf.common.context.InstanceIdentifierContext;
  39 import org.opendaylight.restconf.common.context.NormalizedNodeContext;
  40 import org.opendaylight.restconf.common.context.WriterParameters;
  41 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  42 import org.opendaylight.restconf.common.errors.RestconfError;
  43 import org.opendaylight.restconf.common.errors.RestconfError.ErrorTag;
  44 import org.opendaylight.restconf.common.errors.RestconfError.ErrorType;
  45 import org.opendaylight.restconf.common.patch.PatchContext;
  46 import org.opendaylight.restconf.common.patch.PatchStatusContext;
  47 import org.opendaylight.restconf.nb.rfc8040.Rfc8040;
  48 import org.opendaylight.restconf.nb.rfc8040.handlers.ActionServiceHandler;
  49 import org.opendaylight.restconf.nb.rfc8040.handlers.DOMMountPointServiceHandler;
  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     // FIXME: evaluate thread-safety of updates (synchronized) vs. access (mostly unsynchronized) here
 110     private SchemaContextHandler schemaContextHandler;
 111     private TransactionChainHandler transactionChainHandler;
 112     private DOMMountPointServiceHandler mountPointServiceHandler;
 113     private volatile ActionServiceHandler actionServiceHandler;
 114
 115     public RestconfDataServiceImpl(final SchemaContextHandler schemaContextHandler,
 116             final TransactionChainHandler transactionChainHandler,
 117             final DOMMountPointServiceHandler mountPointServiceHandler,
 118             final RestconfStreamsSubscriptionService delegRestconfSubscrService,
 119             final ActionServiceHandler actionServiceHandler,
 120             final Configuration configuration) {
 121         this.actionServiceHandler = requireNonNull(actionServiceHandler);
 122         this.schemaContextHandler = requireNonNull(schemaContextHandler);
 123         this.transactionChainHandler = requireNonNull(transactionChainHandler);
 124         this.mountPointServiceHandler = requireNonNull(mountPointServiceHandler);
 125         this.delegRestconfSubscrService = requireNonNull(delegRestconfSubscrService);
 126         streamUtils = configuration.isUseSSE() ? SubscribeToStreamUtil.serverSentEvents()
 127                 : SubscribeToStreamUtil.webSockets();
 128     }
 129
 130     @Override
 131     public synchronized void updateHandlers(final Object... handlers) {
 132         for (final Object object : handlers) {
 133             if (object instanceof SchemaContextHandler) {
 134                 schemaContextHandler = (SchemaContextHandler) object;
 135             } else if (object instanceof ActionServiceHandler) {
 136                 actionServiceHandler = (ActionServiceHandler) object;
 137             } else if (object instanceof DOMMountPointServiceHandler) {
 138                 mountPointServiceHandler = (DOMMountPointServiceHandler) object;
 139             } else if (object instanceof TransactionChainHandler) {
 140                 transactionChainHandler = (TransactionChainHandler) object;
 141             }
 142         }
 143     }
 144
 145     @Override
 146     public Response readData(final UriInfo uriInfo) {
 147         return readData(null, uriInfo);
 148     }
 149
 150     @Override
 151     public Response readData(final String identifier, final UriInfo uriInfo) {
 152         final EffectiveModelContext schemaContextRef = this.schemaContextHandler.get();
 153         final InstanceIdentifierContext<?> instanceIdentifier = ParserIdentifier.toInstanceIdentifier(
 154                 identifier, schemaContextRef, Optional.of(this.mountPointServiceHandler.get()));
 155         final WriterParameters parameters = ReadDataTransactionUtil.parseUriParameters(instanceIdentifier, uriInfo);
 156
 157         final DOMMountPoint mountPoint = instanceIdentifier.getMountPoint();
 158         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 159         final NormalizedNode<?, ?> node;
 160         if (parameters.getFieldPaths() != null && !parameters.getFieldPaths().isEmpty()) {
 161             node = ReadDataTransactionUtil.readData(parameters.getContent(), instanceIdentifier.getInstanceIdentifier(),
 162                     strategy, parameters.getWithDefault(), schemaContextRef, parameters.getFieldPaths());
 163         } else {
 164             node = readData(identifier, parameters.getContent(), instanceIdentifier.getInstanceIdentifier(), strategy,
 165                     parameters.getWithDefault(), schemaContextRef, uriInfo);
 166         }
 167         if (identifier != null && identifier.contains(STREAM_PATH) && identifier.contains(STREAM_ACCESS_PATH_PART)
 168                 && identifier.contains(STREAM_LOCATION_PATH_PART)) {
 169             final String value = (String) node.getValue();
 170             final String streamName = value.substring(value.indexOf(NOTIFICATION_STREAM + '/'));
 171             this.delegRestconfSubscrService.subscribeToStream(streamName, uriInfo);
 172         }
 173         if (node == null) {
 174             throw new RestconfDocumentedException(
 175                     "Request could not be completed because the relevant data model content does not exist",
 176                     RestconfError.ErrorType.PROTOCOL,
 177                     RestconfError.ErrorTag.DATA_MISSING);
 178         }
 179
 180         if (parameters.getContent().equals(RestconfDataServiceConstant.ReadData.ALL)
 181                     || parameters.getContent().equals(RestconfDataServiceConstant.ReadData.CONFIG)) {
 182             final QName type = node.getNodeType();
 183             return Response.status(Status.OK)
 184                     .entity(new NormalizedNodeContext(instanceIdentifier, node, parameters))
 185                     .header("ETag", '"' + type.getModule().getRevision().map(Revision::toString).orElse(null)
 186                         + "-" + type.getLocalName() + '"')
 187                     .header("Last-Modified", FORMATTER.format(LocalDateTime.now(Clock.systemUTC())))
 188                     .build();
 189         }
 190
 191         return Response.status(Status.OK)
 192             .entity(new NormalizedNodeContext(instanceIdentifier, node, parameters))
 193             .build();
 194     }
 195
 196     /**
 197      * Read specific type of data from data store via transaction and if identifier read data from
 198      * streams then put streams from actual schema context to datastore.
 199      *
 200      * @param identifier    identifier of data to read
 201      * @param content       type of data to read (config, state, all)
 202      * @param strategy      {@link RestconfStrategy} - object that perform the actual DS operations
 203      * @param withDefa      value of with-defaults parameter
 204      * @param schemaContext schema context
 205      * @param uriInfo       uri info
 206      * @return {@link NormalizedNode}
 207      */
 208     private NormalizedNode<?, ?> readData(final String identifier, final String content,
 209             final YangInstanceIdentifier path, final RestconfStrategy strategy, final String withDefa,
 210             final EffectiveModelContext schemaContext, final UriInfo uriInfo) {
 211         if (identifier != null && identifier.contains(STREAMS_PATH) && !identifier.contains(STREAM_PATH_PART)) {
 212             createAllYangNotificationStreams(strategy, schemaContext, uriInfo);
 213         }
 214         return ReadDataTransactionUtil.readData(content, path, strategy, withDefa, schemaContext);
 215     }
 216
 217     private void createAllYangNotificationStreams(final RestconfStrategy strategy,
 218             final EffectiveModelContext schemaContext, final UriInfo uriInfo) {
 219         final RestconfTransaction transaction = strategy.prepareWriteExecution();
 220
 221         for (final NotificationDefinition notificationDefinition : schemaContext.getNotifications()) {
 222             final NotificationListenerAdapter notifiStreamXML =
 223                 CreateStreamUtil.createYangNotifiStream(notificationDefinition, schemaContext,
 224                     NotificationOutputType.XML);
 225             final NotificationListenerAdapter notifiStreamJSON =
 226                 CreateStreamUtil.createYangNotifiStream(notificationDefinition, schemaContext,
 227                     NotificationOutputType.JSON);
 228             writeNotificationStreamToDatastore(schemaContext, uriInfo, transaction, notifiStreamXML);
 229             writeNotificationStreamToDatastore(schemaContext, uriInfo, transaction, notifiStreamJSON);
 230         }
 231         try {
 232             transaction.commit().get();
 233         } catch (final InterruptedException | ExecutionException e) {
 234             throw new RestconfDocumentedException("Problem while putting data to DS.", e);
 235         }
 236     }
 237
 238     private void writeNotificationStreamToDatastore(final EffectiveModelContext schemaContext,
 239             final UriInfo uriInfo, final RestconfTransaction transaction, final NotificationListenerAdapter listener) {
 240         final URI uri = streamUtils.prepareUriByStreamName(uriInfo, listener.getStreamName());
 241         final MapEntryNode mapToStreams = RestconfMappingNodeUtil.mapYangNotificationStreamByIetfRestconfMonitoring(
 242                 listener.getSchemaPath().lastNodeIdentifier(), schemaContext.getNotifications(), null,
 243                 listener.getOutputType(), uri);
 244
 245         final String name = listener.getSchemaPath().lastNodeIdentifier().getLocalName();
 246         transaction.merge(LogicalDatastoreType.OPERATIONAL,
 247             IdentifierCodec.deserialize(Rfc8040.MonitoringModule.PATH_TO_STREAM_WITHOUT_KEY + name, schemaContext),
 248             mapToStreams);
 249     }
 250
 251     @Override
 252     public Response putData(final String identifier, final NormalizedNodeContext payload, final UriInfo uriInfo) {
 253         requireNonNull(payload);
 254
 255         final QueryParams checkedParms = checkQueryParameters(uriInfo);
 256
 257         final InstanceIdentifierContext<? extends SchemaNode> iid = payload.getInstanceIdentifierContext();
 258
 259         PutDataTransactionUtil.validInputData(iid.getSchemaNode(), payload);
 260         PutDataTransactionUtil.validTopLevelNodeName(iid.getInstanceIdentifier(), payload);
 261         PutDataTransactionUtil.validateListKeysEqualityInPayloadAndUri(payload);
 262
 263         final DOMMountPoint mountPoint = payload.getInstanceIdentifierContext().getMountPoint();
 264         final EffectiveModelContext ref = mountPoint == null
 265                 ? this.schemaContextHandler.get() : modelContext(mountPoint);
 266
 267         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 268         return PutDataTransactionUtil.putData(payload, ref, strategy, checkedParms.insert, checkedParms.point);
 269     }
 270
 271     private static QueryParams checkQueryParameters(final UriInfo uriInfo) {
 272         boolean insertUsed = false;
 273         boolean pointUsed = false;
 274         Insert insert = null;
 275         String point = null;
 276
 277         for (final Entry<String, List<String>> entry : uriInfo.getQueryParameters().entrySet()) {
 278             switch (entry.getKey()) {
 279                 case INSERT:
 280                     if (insertUsed) {
 281                         throw new RestconfDocumentedException("Insert parameter can be used only once.",
 282                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 283                     }
 284
 285                     insertUsed = true;
 286                     final String str = entry.getValue().get(0);
 287                     insert = Insert.forValue(str);
 288                     if (insert == null) {
 289                         throw new RestconfDocumentedException("Unrecognized insert parameter value '" + str + "'",
 290                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 291                     }
 292                     break;
 293                 case POINT:
 294                     if (pointUsed) {
 295                         throw new RestconfDocumentedException("Point parameter can be used only once.",
 296                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 297                     }
 298
 299                     pointUsed = true;
 300                     point = entry.getValue().get(0);
 301                     break;
 302                 default:
 303                     throw new RestconfDocumentedException("Bad parameter for post: " + entry.getKey(),
 304                             RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 305             }
 306         }
 307
 308         checkQueryParams(insertUsed, pointUsed, insert);
 309         return new QueryParams(insert, point);
 310     }
 311
 312     private static void checkQueryParams(final boolean insertUsed, final boolean pointUsed, final Insert insert) {
 313         if (pointUsed) {
 314             if (!insertUsed) {
 315                 throw new RestconfDocumentedException("Point parameter can't be used without Insert parameter.",
 316                     RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 317             }
 318
 319             if (insert != Insert.BEFORE && insert != Insert.AFTER) {
 320                 throw new RestconfDocumentedException(
 321                     "Point parameter can be used only with 'after' or 'before' values of Insert parameter.",
 322                     RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ELEMENT);
 323             }
 324         }
 325     }
 326
 327     @Override
 328     public Response postData(final String identifier, final NormalizedNodeContext payload, final UriInfo uriInfo) {
 329         return postData(payload, uriInfo);
 330     }
 331
 332     @Override
 333     public Response postData(final NormalizedNodeContext payload, final UriInfo uriInfo) {
 334         requireNonNull(payload);
 335         if (payload.getInstanceIdentifierContext().getSchemaNode() instanceof ActionDefinition) {
 336             return invokeAction(payload);
 337         }
 338
 339         final QueryParams checkedParms = checkQueryParameters(uriInfo);
 340         final DOMMountPoint mountPoint = payload.getInstanceIdentifierContext().getMountPoint();
 341         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 342         return PostDataTransactionUtil.postData(uriInfo, payload, strategy,
 343                 getSchemaContext(mountPoint), checkedParms.insert, checkedParms.point);
 344     }
 345
 346     @Override
 347     public Response deleteData(final String identifier) {
 348         final InstanceIdentifierContext<?> instanceIdentifier = ParserIdentifier.toInstanceIdentifier(
 349                 identifier, this.schemaContextHandler.get(), Optional.of(this.mountPointServiceHandler.get()));
 350
 351         final DOMMountPoint mountPoint = instanceIdentifier.getMountPoint();
 352         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 353         return DeleteDataTransactionUtil.deleteData(strategy, instanceIdentifier.getInstanceIdentifier());
 354     }
 355
 356     @Override
 357     public PatchStatusContext patchData(final String identifier, final PatchContext context, final UriInfo uriInfo) {
 358         return patchData(context, uriInfo);
 359     }
 360
 361     @Override
 362     public PatchStatusContext patchData(final PatchContext context, final UriInfo uriInfo) {
 363         final DOMMountPoint mountPoint = requireNonNull(context).getInstanceIdentifierContext().getMountPoint();
 364         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 365         return PatchDataTransactionUtil.patchData(context, strategy, getSchemaContext(mountPoint));
 366     }
 367
 368     @Override
 369     public Response patchData(final String identifier, final NormalizedNodeContext payload, final UriInfo uriInfo) {
 370         requireNonNull(payload);
 371
 372         final InstanceIdentifierContext<? extends SchemaNode> iid = payload
 373                 .getInstanceIdentifierContext();
 374
 375         PutDataTransactionUtil.validInputData(iid.getSchemaNode(), payload);
 376         PutDataTransactionUtil.validTopLevelNodeName(iid.getInstanceIdentifier(), payload);
 377         PutDataTransactionUtil.validateListKeysEqualityInPayloadAndUri(payload);
 378
 379         final DOMMountPoint mountPoint = payload.getInstanceIdentifierContext().getMountPoint();
 380         final EffectiveModelContext ref = mountPoint == null
 381                 ? this.schemaContextHandler.get() : modelContext(mountPoint);
 382         final RestconfStrategy strategy = getRestconfStrategy(mountPoint);
 383
 384         return PlainPatchDataTransactionUtil.patchData(payload, strategy, ref);
 385     }
 386
 387     private EffectiveModelContext getSchemaContext(final DOMMountPoint mountPoint) {
 388         return mountPoint == null ? schemaContextHandler.get() : modelContext(mountPoint);
 389     }
 390
 391     // FIXME: why is this synchronized?
 392     public synchronized RestconfStrategy getRestconfStrategy(final DOMMountPoint mountPoint) {
 393         if (mountPoint == null) {
 394             return new MdsalRestconfStrategy(transactionChainHandler);
 395         }
 396
 397         return RestconfStrategy.forMountPoint(mountPoint).orElseThrow(() -> {
 398             LOG.warn("Mount point {} does not expose a suitable access interface", mountPoint.getIdentifier());
 399             return new RestconfDocumentedException("Could not find a supported access interface in mount point "
 400                 + mountPoint.getIdentifier());
 401         });
 402     }
 403
 404     /**
 405      * Invoke Action operation.
 406      *
 407      * @param payload {@link NormalizedNodeContext} - the body of the operation
 408      * @return {@link NormalizedNodeContext} wrapped in {@link Response}
 409      */
 410     public Response invokeAction(final NormalizedNodeContext payload) {
 411         final InstanceIdentifierContext<?> context = payload.getInstanceIdentifierContext();
 412         final DOMMountPoint mountPoint = context.getMountPoint();
 413         final Absolute schemaPath = Absolute.of(ImmutableList.copyOf(context.getSchemaNode().getPath()
 414             .getPathFromRoot()));
 415         final YangInstanceIdentifier yangIIdContext = context.getInstanceIdentifier();
 416         final NormalizedNode<?, ?> data = payload.getData();
 417
 418         if (yangIIdContext.isEmpty() && !RestconfDataServiceConstant.NETCONF_BASE_QNAME.equals(data.getNodeType())) {
 419             throw new RestconfDocumentedException("Instance identifier need to contain at least one path argument",
 420                 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
 421         }
 422
 423         final DOMActionResult response;
 424         final EffectiveModelContext schemaContextRef;
 425         if (mountPoint != null) {
 426             response = RestconfInvokeOperationsUtil.invokeActionViaMountPoint(mountPoint, (ContainerNode) data,
 427                 schemaPath, yangIIdContext);
 428             schemaContextRef = modelContext(mountPoint);
 429         } else {
 430             response = RestconfInvokeOperationsUtil.invokeAction((ContainerNode) data, schemaPath,
 431                 this.actionServiceHandler, yangIIdContext);
 432             schemaContextRef = this.schemaContextHandler.get();
 433         }
 434         final DOMActionResult result = RestconfInvokeOperationsUtil.checkActionResponse(response);
 435
 436         ActionDefinition resultNodeSchema = null;
 437         ContainerNode resultData = null;
 438         if (result != null) {
 439             final Optional<ContainerNode> optOutput = result.getOutput();
 440             if (optOutput.isPresent()) {
 441                 resultData = optOutput.get();
 442                 resultNodeSchema = (ActionDefinition) context.getSchemaNode();
 443             }
 444         }
 445
 446         if (resultData != null && resultData.getValue().isEmpty()) {
 447             return Response.status(Status.NO_CONTENT).build();
 448         }
 449
 450         return Response.status(Status.OK)
 451             .entity(new NormalizedNodeContext(
 452                 new InstanceIdentifierContext<>(yangIIdContext, resultNodeSchema, mountPoint, schemaContextRef),
 453                 resultData))
 454             .build();
 455     }
 456
 457     private static EffectiveModelContext modelContext(final DOMMountPoint mountPoint) {
 458         return mountPoint.getService(DOMSchemaService.class)
 459             .flatMap(svc -> Optional.ofNullable(svc.getGlobalContext()))
 460             .orElse(null);
 461     }
 462 }