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