restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/rests/services/impl/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.nb.rfc8040.rests.services.impl;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.collect.ImmutableSet;
  13 import java.util.Collection;
  14 import java.util.Set;
  15 import java.util.stream.Collectors;
  16 import org.eclipse.jdt.annotation.Nullable;
  17 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  18 import org.opendaylight.mdsal.dom.api.DOMMountPoint;
  19 import org.opendaylight.mdsal.dom.api.DOMMountPointService;
  20 import org.opendaylight.mdsal.dom.api.DOMNotificationService;
  21 import org.opendaylight.mdsal.dom.api.DOMRpcResult;
  22 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  23 import org.opendaylight.mdsal.dom.spi.DefaultDOMRpcResult;
  24 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  25 import org.opendaylight.restconf.nb.rfc8040.legacy.NormalizedNodePayload;
  26 import org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfStreamsConstants;
  27 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.DeviceNotificationListenerAdaptor;
  28 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.ListenersBroker;
  29 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.NotificationListenerAdapter;
  30 import org.opendaylight.restconf.nb.rfc8040.utils.parser.IdentifierCodec;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.device.notification.rev221106.SubscribeDeviceNotificationInput;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.device.notification.rev221106.SubscribeDeviceNotificationOutput;
  33 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.CreateDataChangeEventSubscriptionInput1.Scope;
  34 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping;
  35 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
  36 import org.opendaylight.yangtools.yang.common.ErrorTag;
  37 import org.opendaylight.yangtools.yang.common.ErrorType;
  38 import org.opendaylight.yangtools.yang.common.QName;
  39 import org.opendaylight.yangtools.yang.common.QNameModule;
  40 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  41 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.AugmentationIdentifier;
  42 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  43 import org.opendaylight.yangtools.yang.data.api.schema.AugmentationNode;
  44 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  45 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  46 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
  47 import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
  48 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  49 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  50 import org.opendaylight.yangtools.yang.model.api.Module;
  51 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
  52 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
  53 import org.slf4j.Logger;
  54 import org.slf4j.LoggerFactory;
  55
  56 /**
  57  * Utility class for creation of data-change-event or YANG notification streams.
  58  */
  59 final class CreateStreamUtil {
  60     private static final Logger LOG = LoggerFactory.getLogger(CreateStreamUtil.class);
  61     private static final QNameModule SAL_REMOTE_AUGMENT = NotificationOutputTypeGrouping.QNAME.getModule();
  62
  63     private static final QNameModule DEVICE_NOTIFICATION_MODULE = SubscribeDeviceNotificationInput.QNAME.getModule();
  64     private static final QName DATASTORE_QNAME =
  65         QName.create(SAL_REMOTE_AUGMENT, RestconfStreamsConstants.DATASTORE_PARAM_NAME).intern();
  66     private static final QName SCOPE_QNAME =
  67         QName.create(SAL_REMOTE_AUGMENT, RestconfStreamsConstants.SCOPE_PARAM_NAME).intern();
  68     private static final QName OUTPUT_TYPE_QNAME =
  69         QName.create(SAL_REMOTE_AUGMENT, "notification-output-type").intern();
  70     private static final QName DEVICE_NOTIFICATION_PATH_QNAME =
  71         QName.create(DEVICE_NOTIFICATION_MODULE, "path").intern();
  72     private static final QName DEVICE_NOTIFICATION_STREAM_PATH =
  73         QName.create(DEVICE_NOTIFICATION_PATH_QNAME, "stream-path").intern();
  74     private static final NodeIdentifier DATASTORE_NODEID = NodeIdentifier.create(DATASTORE_QNAME);
  75     private static final NodeIdentifier SCOPE_NODEID = NodeIdentifier.create(SCOPE_QNAME);
  76     private static final NodeIdentifier OUTPUT_TYPE_NODEID = NodeIdentifier.create(OUTPUT_TYPE_QNAME);
  77     private static final NodeIdentifier DEVICE_NOTIFICATION_PATH_NODEID =
  78         NodeIdentifier.create(DEVICE_NOTIFICATION_PATH_QNAME);
  79     private static final AugmentationIdentifier SAL_REMOTE_AUG_IDENTIFIER = new AugmentationIdentifier(
  80         ImmutableSet.of(SCOPE_QNAME, DATASTORE_QNAME, OUTPUT_TYPE_QNAME));
  81
  82     private CreateStreamUtil() {
  83         // Hidden on purpose
  84     }
  85
  86     /**
  87      * Create data-change-event or notification stream with POST operation via RPC.
  88      *
  89      * @param payload      Input of RPC - example in JSON (data-change-event stream):
  90      *                     <pre>
  91      *                     {@code
  92      *                         {
  93      *                             "input": {
  94      *                                 "path": "/toaster:toaster/toaster:toasterStatus",
  95      *                                 "sal-remote-augment:datastore": "OPERATIONAL",
  96      *                                 "sal-remote-augment:scope": "ONE"
  97      *                             }
  98      *                         }
  99      *                     }
 100      *                     </pre>
 101      * @param refSchemaCtx Reference to {@link EffectiveModelContext}.
 102      * @return {@link DOMRpcResult} - Output of RPC - example in JSON:
 103      *     <pre>
 104      *     {@code
 105      *         {
 106      *             "output": {
 107      *                 "stream-name": "toaster:toaster/toaster:toasterStatus/datastore=OPERATIONAL/scope=ONE"
 108      *             }
 109      *         }
 110      *     }
 111      *     </pre>
 112      */
 113     static DOMRpcResult createDataChangeNotifiStream(final NormalizedNodePayload payload,
 114             final EffectiveModelContext refSchemaCtx) {
 115         // parsing out of container with settings and path
 116         final ContainerNode data = (ContainerNode) requireNonNull(payload).getData();
 117         final QName qname = payload.getInstanceIdentifierContext().getSchemaNode().getQName();
 118         final YangInstanceIdentifier path = preparePath(data, qname);
 119
 120         // building of stream name
 121         final StringBuilder streamNameBuilder = new StringBuilder(
 122                 prepareDataChangeNotifiStreamName(path, requireNonNull(refSchemaCtx), data));
 123         final NotificationOutputType outputType = prepareOutputType(data);
 124         if (outputType.equals(NotificationOutputType.JSON)) {
 125             streamNameBuilder.append('/').append(outputType.getName());
 126         }
 127         final String streamName = streamNameBuilder.toString();
 128
 129         // registration of the listener
 130         ListenersBroker.getInstance().registerDataChangeListener(path, streamName, outputType);
 131
 132         // building of output
 133         final QName outputQname = QName.create(qname, "output");
 134         final QName streamNameQname = QName.create(qname, "stream-name");
 135
 136         return new DefaultDOMRpcResult(Builders.containerBuilder()
 137             .withNodeIdentifier(new NodeIdentifier(outputQname))
 138             .withChild(ImmutableNodes.leafNode(streamNameQname, streamName))
 139             .build());
 140     }
 141
 142     /**
 143      * Create device notification stream.
 144      *
 145      * @param baseUrl base Url
 146      * @param payload data
 147      * @param refSchemaCtx Reference to {@link EffectiveModelContext}.
 148      * @param streamUtil stream utility
 149      * @param mountPointService dom mount point service
 150      * @return {@link DOMRpcResult} - Output of RPC - example in JSON
 151      */
 152     static DOMRpcResult createDeviceNotificationListener(final String baseUrl, final NormalizedNodePayload payload,
 153             final EffectiveModelContext refSchemaCtx, final SubscribeToStreamUtil streamUtil,
 154             final DOMMountPointService mountPointService) {
 155         // parsing out of container with settings and path
 156         final ContainerNode data = (ContainerNode) requireNonNull(payload).getData();
 157         final YangInstanceIdentifier value =
 158             (YangInstanceIdentifier) data.findChildByArg(DEVICE_NOTIFICATION_PATH_NODEID)
 159             .map(DataContainerChild::body)
 160             .orElseThrow(() -> new RestconfDocumentedException("Mount point not available", ErrorType.APPLICATION,
 161                 ErrorTag.OPERATION_FAILED));
 162
 163         // FIXME: just beautiful: a ClassCastException if it is something different!
 164         final String deviceName =
 165             ((YangInstanceIdentifier.NodeIdentifierWithPredicates.Singleton)value.getLastPathArgument())
 166             .values().getElement().toString();
 167
 168         final DOMMountPoint mountPoint = mountPointService.getMountPoint(value)
 169             .orElseThrow(() -> new RestconfDocumentedException("Mount point not available", ErrorType.APPLICATION,
 170                 ErrorTag.OPERATION_FAILED));
 171
 172         final NotificationOutputType outputType = prepareOutputType(data);
 173
 174         // FIXME: what is the relationship to the unused refSchemaCtx?
 175         final EffectiveModelContext mountModelContext = mountPoint.getService(DOMSchemaService.class)
 176             .orElseThrow(() -> new RestconfDocumentedException("Mount point schema not available",
 177                 ErrorType.APPLICATION, ErrorTag.OPERATION_FAILED))
 178             .getGlobalContext();
 179         final Collection<? extends NotificationDefinition> notifications = mountModelContext.getNotifications();
 180         if (notifications.isEmpty()) {
 181             throw new RestconfDocumentedException("Device does not support notification", ErrorType.APPLICATION,
 182                 ErrorTag.OPERATION_FAILED);
 183         }
 184
 185         final Set<Absolute> absolutes = notifications.stream()
 186             .map(notificationDefinition -> Absolute.of(notificationDefinition.getQName()))
 187             .collect(Collectors.toUnmodifiableSet());
 188
 189         final DeviceNotificationListenerAdaptor notificationListenerAdapter = ListenersBroker.getInstance()
 190             .registerDeviceNotificationListener(deviceName, outputType, mountModelContext, mountPointService,
 191                 mountPoint.getIdentifier());
 192         notificationListenerAdapter.listen(mountPoint.getService(DOMNotificationService.class).get(), absolutes);
 193
 194         // building of output
 195         return new DefaultDOMRpcResult(Builders.containerBuilder()
 196             .withNodeIdentifier(new NodeIdentifier(SubscribeDeviceNotificationOutput.QNAME))
 197             .withChild(ImmutableNodes.leafNode(DEVICE_NOTIFICATION_STREAM_PATH, baseUrl + deviceName
 198                 + "?" + RestconfStreamsConstants.NOTIFICATION_TYPE + "=" + RestconfStreamsConstants.DEVICE))
 199             .build());
 200     }
 201
 202     /**
 203      * Prepare {@link NotificationOutputType}.
 204      *
 205      * @param data Container with stream settings (RPC create-stream).
 206      * @return Parsed {@link NotificationOutputType}.
 207      */
 208     private static NotificationOutputType prepareOutputType(final ContainerNode data) {
 209         final String outputName = extractStringLeaf(data, OUTPUT_TYPE_NODEID);
 210         return outputName != null ? NotificationOutputType.valueOf(outputName) : NotificationOutputType.XML;
 211     }
 212
 213     /**
 214      * Prepare stream name.
 215      *
 216      * @param path          Path of element from which data-change-event notifications are going to be generated.
 217      * @param schemaContext Schema context.
 218      * @param data          Container with stream settings (RPC create-stream).
 219      * @return Parsed stream name.
 220      */
 221     private static String prepareDataChangeNotifiStreamName(final YangInstanceIdentifier path,
 222             final EffectiveModelContext schemaContext, final ContainerNode data) {
 223         final String datastoreName = extractStringLeaf(data, DATASTORE_NODEID);
 224         final LogicalDatastoreType datastoreType = datastoreName != null ? LogicalDatastoreType.valueOf(datastoreName)
 225             : LogicalDatastoreType.CONFIGURATION;
 226
 227         final String scopeName = extractStringLeaf(data, SCOPE_NODEID);
 228         // FIXME: this is not really used
 229         final Scope scope = scopeName != null ? Scope.ofName(scopeName) : Scope.BASE;
 230
 231         return RestconfStreamsConstants.DATA_SUBSCRIPTION
 232             + "/" + ListenersBroker.createStreamNameFromUri(IdentifierCodec.serialize(path, schemaContext)
 233                 + "/" + RestconfStreamsConstants.DATASTORE_PARAM_NAME + "=" + datastoreType
 234                 + "/" + RestconfStreamsConstants.SCOPE_PARAM_NAME + "=" + scope);
 235     }
 236
 237     /**
 238      * Prepare {@link YangInstanceIdentifier} of stream source.
 239      *
 240      * @param data          Container with stream settings (RPC create-stream).
 241      * @param qualifiedName QName of the input RPC context (used only in debugging).
 242      * @return Parsed {@link YangInstanceIdentifier} of data element from which the data-change-event notifications
 243      *     are going to be generated.
 244      */
 245     private static YangInstanceIdentifier preparePath(final ContainerNode data, final QName qualifiedName) {
 246         final Object pathValue = data.findChildByArg(new NodeIdentifier(QName.create(qualifiedName, "path")))
 247             .map(DataContainerChild::body)
 248             .orElse(null);
 249         if (!(pathValue instanceof YangInstanceIdentifier)) {
 250             LOG.debug("Instance identifier {} was not normalized correctly", qualifiedName);
 251             throw new RestconfDocumentedException(
 252                     "Instance identifier was not normalized correctly",
 253                     ErrorType.APPLICATION,
 254                     ErrorTag.OPERATION_FAILED);
 255         }
 256         return (YangInstanceIdentifier) pathValue;
 257     }
 258
 259     private static @Nullable String extractStringLeaf(final ContainerNode data, final NodeIdentifier childName) {
 260         final DataContainerChild augNode = data.childByArg(SAL_REMOTE_AUG_IDENTIFIER);
 261         if (augNode instanceof AugmentationNode) {
 262             final DataContainerChild enumNode = ((AugmentationNode) augNode).childByArg(childName);
 263             if (enumNode instanceof LeafNode) {
 264                 final Object value = enumNode.body();
 265                 if (value instanceof String) {
 266                     return (String) value;
 267                 }
 268             }
 269         }
 270         return null;
 271     }
 272
 273     /**
 274      * Create YANG notification stream using notification definition in YANG schema.
 275      *
 276      * @param notificationDefinition YANG notification definition.
 277      * @param refSchemaCtx           Reference to {@link EffectiveModelContext}
 278      * @param outputType             Output type (XML or JSON).
 279      * @return {@link NotificationListenerAdapter}
 280      */
 281     static NotificationListenerAdapter createYangNotifiStream(final NotificationDefinition notificationDefinition,
 282             final EffectiveModelContext refSchemaCtx, final NotificationOutputType outputType) {
 283         final var streamName = parseNotificationStreamName(requireNonNull(notificationDefinition),
 284                 requireNonNull(refSchemaCtx), requireNonNull(outputType.getName()));
 285         final var listenersBroker = ListenersBroker.getInstance();
 286
 287         final var existing = listenersBroker.notificationListenerFor(streamName);
 288         return existing != null ? existing
 289             : listenersBroker.registerNotificationListener(
 290                 Absolute.of(notificationDefinition.getQName()), streamName, outputType);
 291     }
 292
 293     private static String parseNotificationStreamName(final NotificationDefinition notificationDefinition,
 294             final EffectiveModelContext refSchemaCtx, final String outputType) {
 295         final QName notificationDefinitionQName = notificationDefinition.getQName();
 296         final Module module = refSchemaCtx.findModule(
 297                 notificationDefinitionQName.getModule().getNamespace(),
 298                 notificationDefinitionQName.getModule().getRevision()).orElse(null);
 299         requireNonNull(module, String.format("Module for namespace %s does not exist.",
 300                 notificationDefinitionQName.getModule().getNamespace()));
 301
 302         final StringBuilder streamNameBuilder = new StringBuilder();
 303         streamNameBuilder.append(RestconfStreamsConstants.NOTIFICATION_STREAM)
 304                 .append('/')
 305                 .append(module.getName())
 306                 .append(':')
 307                 .append(notificationDefinitionQName.getLocalName());
 308         if (outputType.equals(NotificationOutputType.JSON.getName())) {
 309             streamNameBuilder.append('/').append(NotificationOutputType.JSON.getName());
 310         }
 311         return streamNameBuilder.toString();
 312     }
 313 }