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