restconf/restconf-nb-rfc8040/src/main/java/org/opendaylight/restconf/nb/rfc8040/rests/utils/PostDataTransactionUtil.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.utils;
   9
  10 import com.google.common.util.concurrent.FluentFuture;
  11 import java.net.URI;
  12 import java.util.Collection;
  13 import java.util.Optional;
  14 import javax.ws.rs.core.Response;
  15 import javax.ws.rs.core.Response.Status;
  16 import javax.ws.rs.core.UriInfo;
  17 import org.opendaylight.mdsal.common.api.CommitInfo;
  18 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  19 import org.opendaylight.mdsal.dom.api.DOMTransactionChain;
  20 import org.opendaylight.restconf.common.context.InstanceIdentifierContext;
  21 import org.opendaylight.restconf.common.context.NormalizedNodeContext;
  22 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  23 import org.opendaylight.restconf.common.errors.RestconfError;
  24 import org.opendaylight.restconf.common.errors.RestconfError.ErrorTag;
  25 import org.opendaylight.restconf.common.errors.RestconfError.ErrorType;
  26 import org.opendaylight.restconf.nb.rfc8040.rests.transactions.RestconfStrategy;
  27 import org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfDataServiceConstant.PostPutQueryParameters.Insert;
  28 import org.opendaylight.restconf.nb.rfc8040.utils.parser.ParserIdentifier;
  29 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  30 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  31 import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
  32 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  33 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodeContainer;
  34 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  35 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  36 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 /**
  41  * Util class to post data to DS.
  42  *
  43  */
  44 public final class PostDataTransactionUtil {
  45     private static final Logger LOG = LoggerFactory.getLogger(PostDataTransactionUtil.class);
  46     // FIXME: why is this being reused from other places?
  47     static final String POST_TX_TYPE = "POST";
  48
  49     private PostDataTransactionUtil() {
  50         // Hidden on purpose
  51     }
  52
  53     /**
  54      * Check mount point and prepare variables for post data. Close {@link DOMTransactionChain} if any inside of object
  55      * {@link RestconfStrategy} provided as a parameter.
  56      *
  57      * @param uriInfo       uri info
  58      * @param payload       data
  59      * @param strategy      Object that perform the actual DS operations
  60      * @param schemaContext reference to actual {@link EffectiveModelContext}
  61      * @param point         point
  62      * @param insert        insert
  63      * @return {@link Response}
  64      */
  65     public static Response postData(final UriInfo uriInfo, final NormalizedNodeContext payload,
  66                                     final RestconfStrategy strategy,
  67                                     final EffectiveModelContext schemaContext, final Insert insert,
  68                                     final String point) {
  69         final YangInstanceIdentifier path = payload.getInstanceIdentifierContext().getInstanceIdentifier();
  70         final FluentFuture<? extends CommitInfo> future = submitData(path, payload.getData(),
  71                 strategy, schemaContext, insert, point);
  72         final URI location = resolveLocation(uriInfo, path, schemaContext, payload.getData());
  73         final ResponseFactory dataFactory = new ResponseFactory(Status.CREATED).location(location);
  74         //This method will close transactionChain if any
  75         FutureCallbackTx.addCallback(future, POST_TX_TYPE, dataFactory, strategy.getTransactionChain(), path);
  76         return dataFactory.build();
  77     }
  78
  79     /**
  80      * Post data by type.
  81      *
  82      * @param path          path
  83      * @param data          data
  84      * @param strategy      object that perform the actual DS operations
  85      * @param schemaContext schema context of data
  86      * @param point         query parameter
  87      * @param insert        query parameter
  88      * @return {@link FluentFuture}
  89      */
  90     private static FluentFuture<? extends CommitInfo> submitData(final YangInstanceIdentifier path,
  91                                                                  final NormalizedNode<?, ?> data,
  92                                                                  final RestconfStrategy strategy,
  93                                                                  final EffectiveModelContext schemaContext,
  94                                                                  final Insert insert, final String point) {
  95         strategy.prepareReadWriteExecution();
  96         if (insert == null) {
  97             makePost(path, data, schemaContext, strategy);
  98             return strategy.commit();
  99         }
 100
 101         PutDataTransactionUtil.checkListAndOrderedType(schemaContext, path);
 102         final NormalizedNode<?, ?> readData;
 103         switch (insert) {
 104             case FIRST:
 105                 readData = PutDataTransactionUtil.readList(strategy, path.getParent().getParent());
 106                 if (readData == null || ((NormalizedNodeContainer<?, ?, ?>) readData).getValue().isEmpty()) {
 107                     strategy.replace(LogicalDatastoreType.CONFIGURATION, path, data, schemaContext);
 108                     return strategy.commit();
 109                 }
 110                 checkItemDoesNotExists(strategy, LogicalDatastoreType.CONFIGURATION, path);
 111                 strategy.remove(LogicalDatastoreType.CONFIGURATION, path.getParent().getParent());
 112                 strategy.replace(LogicalDatastoreType.CONFIGURATION, path, data, schemaContext);
 113                 strategy.replace(LogicalDatastoreType.CONFIGURATION, path.getParent().getParent(), readData,
 114                     schemaContext);
 115                 return strategy.commit();
 116             case LAST:
 117                 makePost(path, data, schemaContext, strategy);
 118                 return strategy.commit();
 119             case BEFORE:
 120                 readData = PutDataTransactionUtil.readList(strategy, path.getParent().getParent());
 121                 if (readData == null || ((NormalizedNodeContainer<?, ?, ?>) readData).getValue().isEmpty()) {
 122                     strategy.replace(LogicalDatastoreType.CONFIGURATION, path, data, schemaContext);
 123                     return strategy.commit();
 124                 }
 125                 checkItemDoesNotExists(strategy, LogicalDatastoreType.CONFIGURATION, path);
 126                 insertWithPointPost(path, data, schemaContext, point,
 127                     (NormalizedNodeContainer<?, ?, NormalizedNode<?, ?>>) readData, true, strategy);
 128                 return strategy.commit();
 129             case AFTER:
 130                 readData = PutDataTransactionUtil.readList(strategy, path.getParent().getParent());
 131                 if (readData == null || ((NormalizedNodeContainer<?, ?, ?>) readData).getValue().isEmpty()) {
 132                     strategy.replace(LogicalDatastoreType.CONFIGURATION, path, data, schemaContext);
 133                     return strategy.commit();
 134                 }
 135                 checkItemDoesNotExists(strategy, LogicalDatastoreType.CONFIGURATION, path);
 136                 insertWithPointPost(path, data, schemaContext, point,
 137                     (NormalizedNodeContainer<?, ?, NormalizedNode<?, ?>>) readData, false, strategy);
 138                 return strategy.commit();
 139             default:
 140                 throw new RestconfDocumentedException(
 141                     "Used bad value of insert parameter. Possible values are first, last, before or after, but was: "
 142                         + insert, RestconfError.ErrorType.PROTOCOL, RestconfError.ErrorTag.BAD_ATTRIBUTE);
 143         }
 144     }
 145
 146     private static void insertWithPointPost(final YangInstanceIdentifier path,
 147                                             final NormalizedNode<?, ?> data,
 148                                             final EffectiveModelContext schemaContext, final String point,
 149                                             final NormalizedNodeContainer<?, ?, NormalizedNode<?, ?>> readList,
 150                                             final boolean before, final RestconfStrategy strategy) {
 151         final YangInstanceIdentifier parent = path.getParent().getParent();
 152         strategy.remove(LogicalDatastoreType.CONFIGURATION, parent);
 153         final InstanceIdentifierContext<?> instanceIdentifier =
 154             ParserIdentifier.toInstanceIdentifier(point, schemaContext, Optional.empty());
 155         int lastItemPosition = 0;
 156         for (final NormalizedNode<?, ?> nodeChild : readList.getValue()) {
 157             if (nodeChild.getIdentifier().equals(instanceIdentifier.getInstanceIdentifier().getLastPathArgument())) {
 158                 break;
 159             }
 160             lastItemPosition++;
 161         }
 162         if (!before) {
 163             lastItemPosition++;
 164         }
 165         int lastInsertedPosition = 0;
 166         final NormalizedNode<?, ?> emptySubtree = ImmutableNodes.fromInstanceId(schemaContext, parent);
 167         strategy.merge(LogicalDatastoreType.CONFIGURATION,
 168             YangInstanceIdentifier.create(emptySubtree.getIdentifier()), emptySubtree);
 169         for (final NormalizedNode<?, ?> nodeChild : readList.getValue()) {
 170             if (lastInsertedPosition == lastItemPosition) {
 171                 strategy.replace(LogicalDatastoreType.CONFIGURATION, path, data, schemaContext);
 172             }
 173             final YangInstanceIdentifier childPath = parent.node(nodeChild.getIdentifier());
 174             strategy.replace(LogicalDatastoreType.CONFIGURATION, childPath, nodeChild, schemaContext);
 175             lastInsertedPosition++;
 176         }
 177     }
 178
 179     private static void makePost(final YangInstanceIdentifier path, final NormalizedNode<?, ?> data,
 180                                  final SchemaContext schemaContext, final RestconfStrategy strategy) {
 181         try {
 182             strategy.create(LogicalDatastoreType.CONFIGURATION, path, data, schemaContext);
 183         } catch (RestconfDocumentedException e) {
 184             // close transaction if any and pass exception further
 185             strategy.cancel();
 186             throw e;
 187         }
 188     }
 189
 190     /**
 191      * Get location from {@link YangInstanceIdentifier} and {@link UriInfo}.
 192      *
 193      * @param uriInfo       uri info
 194      * @param initialPath   data path
 195      * @param schemaContext reference to {@link SchemaContext}
 196      * @return {@link URI}
 197      */
 198     private static URI resolveLocation(final UriInfo uriInfo, final YangInstanceIdentifier initialPath,
 199                                        final EffectiveModelContext schemaContext, final NormalizedNode<?, ?> data) {
 200         if (uriInfo == null) {
 201             return null;
 202         }
 203
 204         YangInstanceIdentifier path = initialPath;
 205         if (data instanceof MapNode) {
 206             final Collection<MapEntryNode> children = ((MapNode) data).getValue();
 207             if (!children.isEmpty()) {
 208                 path = path.node(children.iterator().next().getIdentifier());
 209             }
 210         }
 211
 212         return uriInfo.getBaseUriBuilder()
 213                 .path("data")
 214                 .path(ParserIdentifier.stringFromYangInstanceIdentifier(path, schemaContext))
 215                 .build();
 216     }
 217
 218     /**
 219      * Check if items do NOT already exists at specified {@code path}. Throws {@link RestconfDocumentedException} if
 220      * data already exists.
 221      *
 222      * @param strategy      Object that perform the actual DS operations
 223      * @param store         Datastore
 224      * @param path          Path to be checked
 225      */
 226     public static void checkItemDoesNotExists(final RestconfStrategy strategy,
 227                                                final LogicalDatastoreType store, final YangInstanceIdentifier path) {
 228         final FluentFuture<Boolean> future = strategy.exists(store, path);
 229         final FutureDataFactory<Boolean> response = new FutureDataFactory<>();
 230
 231         FutureCallbackTx.addCallback(future, POST_TX_TYPE, response);
 232
 233         if (response.result) {
 234             LOG.trace("Operation via Restconf was not executed because data at {} already exists", path);
 235             throw new RestconfDocumentedException(
 236                 "Data already exists", ErrorType.PROTOCOL, ErrorTag.DATA_EXISTS, path);
 237         }
 238     }
 239 }