opendaylight/md-sal/sal-clustering-commons/src/main/java/org/opendaylight/controller/cluster/datastore/node/utils/stream/LithiumNormalizedNodeInputStreamReader.java

   1 /*
   2  * Copyright (c) 2014, 2015 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.controller.cluster.datastore.node.utils.stream;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.base.Strings;
  13 import com.google.common.collect.ImmutableList;
  14 import com.google.common.collect.ImmutableList.Builder;
  15 import java.io.DataInput;
  16 import java.io.IOException;
  17 import java.io.StringReader;
  18 import java.math.BigDecimal;
  19 import java.math.BigInteger;
  20 import java.nio.charset.StandardCharsets;
  21 import java.util.ArrayList;
  22 import java.util.HashSet;
  23 import java.util.List;
  24 import java.util.Set;
  25 import javax.xml.parsers.DocumentBuilderFactory;
  26 import javax.xml.parsers.ParserConfigurationException;
  27 import javax.xml.transform.dom.DOMSource;
  28 import org.eclipse.jdt.annotation.NonNull;
  29 import org.opendaylight.controller.cluster.datastore.node.utils.QNameFactory;
  30 import org.opendaylight.yangtools.util.ImmutableOffsetMapTemplate;
  31 import org.opendaylight.yangtools.yang.common.Empty;
  32 import org.opendaylight.yangtools.yang.common.QName;
  33 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  34 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.AugmentationIdentifier;
  35 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  36 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
  37 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeWithValue;
  38 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  39 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
  40 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetEntryNode;
  41 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  42 import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
  43 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.ListNodeBuilder;
  44 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.NormalizedNodeBuilder;
  45 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.NormalizedNodeContainerBuilder;
  46 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  47 import org.slf4j.Logger;
  48 import org.slf4j.LoggerFactory;
  49 import org.w3c.dom.Element;
  50 import org.xml.sax.InputSource;
  51 import org.xml.sax.SAXException;
  52
  53 /**
  54  * NormalizedNodeInputStreamReader reads the byte stream and constructs the normalized node including its children
  55  * nodes. This process goes in recursive manner, where each NodeTypes object signifies the start of the object, except
  56  * END_NODE. If a node can have children, then that node's end is calculated based on appearance of END_NODE.
  57  */
  58 class LithiumNormalizedNodeInputStreamReader extends ForwardingDataInput implements NormalizedNodeDataInput {
  59
  60     private static final Logger LOG = LoggerFactory.getLogger(LithiumNormalizedNodeInputStreamReader.class);
  61
  62     private final @NonNull DataInput input;
  63
  64     private final List<String> codedStringMap = new ArrayList<>();
  65
  66     private QName lastLeafSetQName;
  67
  68     private NormalizedNodeBuilder<NodeIdentifier, Object, LeafNode<Object>> leafBuilder;
  69
  70     @SuppressWarnings("rawtypes")
  71     private NormalizedNodeBuilder<NodeWithValue, Object, LeafSetEntryNode<Object>> leafSetEntryBuilder;
  72
  73     LithiumNormalizedNodeInputStreamReader(final DataInput input) {
  74         this.input = requireNonNull(input);
  75     }
  76
  77     @Override
  78     final DataInput delegate() {
  79         return input;
  80     }
  81
  82     @Override
  83     public NormalizedNodeStreamVersion getVersion() throws IOException {
  84         return NormalizedNodeStreamVersion.LITHIUM;
  85     }
  86
  87     @Override
  88     public NormalizedNode<?, ?> readNormalizedNode() throws IOException {
  89         return readNormalizedNodeInternal();
  90     }
  91
  92     private NormalizedNode<?, ?> readNormalizedNodeInternal() throws IOException {
  93         // each node should start with a byte
  94         byte nodeType = input.readByte();
  95
  96         if (nodeType == NodeTypes.END_NODE) {
  97             LOG.trace("End node reached. return");
  98             lastLeafSetQName = null;
  99             return null;
 100         }
 101
 102         switch (nodeType) {
 103             case NodeTypes.AUGMENTATION_NODE:
 104                 AugmentationIdentifier augIdentifier = readAugmentationIdentifier();
 105                 LOG.trace("Reading augmentation node {} ", augIdentifier);
 106                 return addDataContainerChildren(Builders.augmentationBuilder().withNodeIdentifier(augIdentifier))
 107                         .build();
 108
 109             case NodeTypes.LEAF_SET_ENTRY_NODE:
 110                 final QName name = lastLeafSetQName != null ? lastLeafSetQName : readQName();
 111                 final Object value = readObject();
 112                 final NodeWithValue<Object> leafIdentifier = new NodeWithValue<>(name, value);
 113                 LOG.trace("Reading leaf set entry node {}, value {}", leafIdentifier, value);
 114                 return leafSetEntryBuilder().withNodeIdentifier(leafIdentifier).withValue(value).build();
 115
 116             case NodeTypes.MAP_ENTRY_NODE:
 117                 final NodeIdentifierWithPredicates entryIdentifier = readNormalizedNodeWithPredicates();
 118                 LOG.trace("Reading map entry node {} ", entryIdentifier);
 119                 return addDataContainerChildren(Builders.mapEntryBuilder().withNodeIdentifier(entryIdentifier))
 120                         .build();
 121
 122             default:
 123                 return readNodeIdentifierDependentNode(nodeType, readNodeIdentifier());
 124         }
 125     }
 126
 127     private NormalizedNodeBuilder<NodeIdentifier, Object, LeafNode<Object>> leafBuilder() {
 128         if (leafBuilder == null) {
 129             leafBuilder = Builders.leafBuilder();
 130         }
 131
 132         return leafBuilder;
 133     }
 134
 135     @SuppressWarnings("rawtypes")
 136     private NormalizedNodeBuilder<NodeWithValue, Object, LeafSetEntryNode<Object>> leafSetEntryBuilder() {
 137         if (leafSetEntryBuilder == null) {
 138             leafSetEntryBuilder = Builders.leafSetEntryBuilder();
 139         }
 140
 141         return leafSetEntryBuilder;
 142     }
 143
 144     private NormalizedNode<?, ?> readNodeIdentifierDependentNode(final byte nodeType, final NodeIdentifier identifier)
 145         throws IOException {
 146
 147         switch (nodeType) {
 148             case NodeTypes.LEAF_NODE:
 149                 LOG.trace("Read leaf node {}", identifier);
 150                 // Read the object value
 151                 return leafBuilder().withNodeIdentifier(identifier).withValue(readObject()).build();
 152
 153             case NodeTypes.ANY_XML_NODE:
 154                 LOG.trace("Read xml node");
 155                 return Builders.anyXmlBuilder().withNodeIdentifier(identifier).withValue(readDOMSource()).build();
 156
 157             case NodeTypes.MAP_NODE:
 158                 LOG.trace("Read map node {}", identifier);
 159                 return addDataContainerChildren(Builders.mapBuilder().withNodeIdentifier(identifier)).build();
 160
 161             case NodeTypes.CHOICE_NODE:
 162                 LOG.trace("Read choice node {}", identifier);
 163                 return addDataContainerChildren(Builders.choiceBuilder().withNodeIdentifier(identifier)).build();
 164
 165             case NodeTypes.ORDERED_MAP_NODE:
 166                 LOG.trace("Reading ordered map node {}", identifier);
 167                 return addDataContainerChildren(Builders.orderedMapBuilder().withNodeIdentifier(identifier)).build();
 168
 169             case NodeTypes.UNKEYED_LIST:
 170                 LOG.trace("Read unkeyed list node {}", identifier);
 171                 return addDataContainerChildren(Builders.unkeyedListBuilder().withNodeIdentifier(identifier)).build();
 172
 173             case NodeTypes.UNKEYED_LIST_ITEM:
 174                 LOG.trace("Read unkeyed list item node {}", identifier);
 175                 return addDataContainerChildren(Builders.unkeyedListEntryBuilder()
 176                         .withNodeIdentifier(identifier)).build();
 177
 178             case NodeTypes.CONTAINER_NODE:
 179                 LOG.trace("Read container node {}", identifier);
 180                 return addDataContainerChildren(Builders.containerBuilder().withNodeIdentifier(identifier)).build();
 181
 182             case NodeTypes.LEAF_SET:
 183                 LOG.trace("Read leaf set node {}", identifier);
 184                 return addLeafSetChildren(identifier.getNodeType(),
 185                         Builders.leafSetBuilder().withNodeIdentifier(identifier)).build();
 186
 187             case NodeTypes.ORDERED_LEAF_SET:
 188                 LOG.trace("Read ordered leaf set node {}", identifier);
 189                 return addLeafSetChildren(identifier.getNodeType(),
 190                         Builders.orderedLeafSetBuilder().withNodeIdentifier(identifier)).build();
 191
 192             default:
 193                 return null;
 194         }
 195     }
 196
 197     private DOMSource readDOMSource() throws IOException {
 198         String xml = readObject().toString();
 199         try {
 200             DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 201             factory.setNamespaceAware(true);
 202             Element node = factory.newDocumentBuilder().parse(
 203                     new InputSource(new StringReader(xml))).getDocumentElement();
 204             return new DOMSource(node);
 205         } catch (SAXException | ParserConfigurationException e) {
 206             throw new IOException("Error parsing XML: " + xml, e);
 207         }
 208     }
 209
 210     QName readQName() throws IOException {
 211         // Read in the same sequence of writing
 212         String localName = readCodedString();
 213         String namespace = readCodedString();
 214         String revision = Strings.emptyToNull(readCodedString());
 215
 216         return QNameFactory.create(new QNameFactory.Key(localName, namespace, revision));
 217     }
 218
 219
 220     private String readCodedString() throws IOException {
 221         final byte valueType = input.readByte();
 222         switch (valueType) {
 223             case TokenTypes.IS_NULL_VALUE:
 224                 return null;
 225             case TokenTypes.IS_CODE_VALUE:
 226                 final int code = input.readInt();
 227                 try {
 228                     return codedStringMap.get(code);
 229                 } catch (IndexOutOfBoundsException e) {
 230                     throw new IOException("String code " + code + " was not found", e);
 231                 }
 232             case TokenTypes.IS_STRING_VALUE:
 233                 final String value = input.readUTF().intern();
 234                 codedStringMap.add(value);
 235                 return value;
 236             default:
 237                 throw new IOException("Unhandled string value type " + valueType);
 238         }
 239     }
 240
 241     private Set<QName> readQNameSet() throws IOException {
 242         // Read the children count
 243         int count = input.readInt();
 244         Set<QName> children = new HashSet<>(count);
 245         for (int i = 0; i < count; i++) {
 246             children.add(readQName());
 247         }
 248         return children;
 249     }
 250
 251     AugmentationIdentifier readAugmentationIdentifier() throws IOException {
 252         return new AugmentationIdentifier(readQNameSet());
 253     }
 254
 255     private NodeIdentifier readNodeIdentifier() throws IOException {
 256         // FIXME: we should have a cache for these, too
 257         return new NodeIdentifier(readQName());
 258     }
 259
 260     private NodeIdentifierWithPredicates readNormalizedNodeWithPredicates() throws IOException {
 261         final QName qname = readQName();
 262         final int count = input.readInt();
 263         switch (count) {
 264             case 0:
 265                 return new NodeIdentifierWithPredicates(qname);
 266             case 1:
 267                 return new NodeIdentifierWithPredicates(qname, readQName(), readObject());
 268             default:
 269                 // ImmutableList is used by ImmutableOffsetMapTemplate for lookups, hence we use that.
 270                 final Builder<QName> keys = ImmutableList.builderWithExpectedSize(count);
 271                 final Object[] values = new Object[count];
 272                 for (int i = 0; i < count; i++) {
 273                     keys.add(readQName());
 274                     values[i] = readObject();
 275                 }
 276
 277                 return new NodeIdentifierWithPredicates(qname, ImmutableOffsetMapTemplate.ordered(keys.build())
 278                     .instantiateWithValues(values));
 279         }
 280     }
 281
 282     private Object readObject() throws IOException {
 283         byte objectType = input.readByte();
 284         switch (objectType) {
 285             case ValueTypes.BITS_TYPE:
 286                 return readObjSet();
 287
 288             case ValueTypes.BOOL_TYPE:
 289                 return input.readBoolean();
 290
 291             case ValueTypes.BYTE_TYPE:
 292                 return input.readByte();
 293
 294             case ValueTypes.INT_TYPE:
 295                 return input.readInt();
 296
 297             case ValueTypes.LONG_TYPE:
 298                 return input.readLong();
 299
 300             case ValueTypes.QNAME_TYPE:
 301                 return readQName();
 302
 303             case ValueTypes.SHORT_TYPE:
 304                 return input.readShort();
 305
 306             case ValueTypes.STRING_TYPE:
 307                 return input.readUTF();
 308
 309             case ValueTypes.STRING_BYTES_TYPE:
 310                 return readStringBytes();
 311
 312             case ValueTypes.BIG_DECIMAL_TYPE:
 313                 return new BigDecimal(input.readUTF());
 314
 315             case ValueTypes.BIG_INTEGER_TYPE:
 316                 return new BigInteger(input.readUTF());
 317
 318             case ValueTypes.BINARY_TYPE:
 319                 byte[] bytes = new byte[input.readInt()];
 320                 input.readFully(bytes);
 321                 return bytes;
 322
 323             case ValueTypes.YANG_IDENTIFIER_TYPE:
 324                 return readYangInstanceIdentifierInternal();
 325
 326             case ValueTypes.EMPTY_TYPE:
 327             // Leaf nodes no longer allow null values and thus we no longer emit null values. Previously, the "empty"
 328             // yang type was represented as null so we translate an incoming null value to Empty. It was possible for
 329             // a BI user to set a string leaf to null and we're rolling the dice here but the chances for that are
 330             // very low. We'd have to know the yang type but, even if we did, we can't let a null value pass upstream
 331             // so we'd have to drop the leaf which might cause other issues.
 332             case ValueTypes.NULL_TYPE:
 333                 return Empty.getInstance();
 334
 335             default:
 336                 return null;
 337         }
 338     }
 339
 340     private String readStringBytes() throws IOException {
 341         byte[] bytes = new byte[input.readInt()];
 342         input.readFully(bytes);
 343         return new String(bytes, StandardCharsets.UTF_8);
 344     }
 345
 346     @Override
 347     public SchemaPath readSchemaPath() throws IOException {
 348         final boolean absolute = input.readBoolean();
 349         final int size = input.readInt();
 350
 351         final Builder<QName> qnames = ImmutableList.builderWithExpectedSize(size);
 352         for (int i = 0; i < size; ++i) {
 353             qnames.add(readQName());
 354         }
 355         return SchemaPath.create(qnames.build(), absolute);
 356     }
 357
 358     @Override
 359     public YangInstanceIdentifier readYangInstanceIdentifier() throws IOException {
 360         return readYangInstanceIdentifierInternal();
 361     }
 362
 363     private YangInstanceIdentifier readYangInstanceIdentifierInternal() throws IOException {
 364         int size = input.readInt();
 365         final Builder<PathArgument> pathArguments = ImmutableList.builderWithExpectedSize(size);
 366         for (int i = 0; i < size; i++) {
 367             pathArguments.add(readPathArgument());
 368         }
 369         return YangInstanceIdentifier.create(pathArguments.build());
 370     }
 371
 372     private Set<String> readObjSet() throws IOException {
 373         int count = input.readInt();
 374         Set<String> children = new HashSet<>(count);
 375         for (int i = 0; i < count; i++) {
 376             children.add(readCodedString());
 377         }
 378         return children;
 379     }
 380
 381     @Override
 382     public PathArgument readPathArgument() throws IOException {
 383         // read Type
 384         int type = input.readByte();
 385
 386         switch (type) {
 387             case PathArgumentTypes.AUGMENTATION_IDENTIFIER:
 388                 return readAugmentationIdentifier();
 389             case PathArgumentTypes.NODE_IDENTIFIER:
 390                 return readNodeIdentifier();
 391             case PathArgumentTypes.NODE_IDENTIFIER_WITH_PREDICATES:
 392                 return readNormalizedNodeWithPredicates();
 393             case PathArgumentTypes.NODE_IDENTIFIER_WITH_VALUE:
 394                 return new NodeWithValue<>(readQName(), readObject());
 395             default:
 396                 // FIXME: throw hard error
 397                 return null;
 398         }
 399     }
 400
 401     @SuppressWarnings("unchecked")
 402     private ListNodeBuilder<Object, LeafSetEntryNode<Object>> addLeafSetChildren(final QName nodeType,
 403             final ListNodeBuilder<Object, LeafSetEntryNode<Object>> builder) throws IOException {
 404
 405         LOG.trace("Reading children of leaf set");
 406
 407         lastLeafSetQName = nodeType;
 408
 409         LeafSetEntryNode<Object> child = (LeafSetEntryNode<Object>)readNormalizedNodeInternal();
 410
 411         while (child != null) {
 412             builder.withChild(child);
 413             child = (LeafSetEntryNode<Object>)readNormalizedNodeInternal();
 414         }
 415         return builder;
 416     }
 417
 418     @SuppressWarnings({ "unchecked", "rawtypes" })
 419     private NormalizedNodeContainerBuilder addDataContainerChildren(
 420             final NormalizedNodeContainerBuilder builder) throws IOException {
 421         LOG.trace("Reading data container (leaf nodes) nodes");
 422
 423         NormalizedNode<?, ?> child = readNormalizedNodeInternal();
 424
 425         while (child != null) {
 426             builder.addChild(child);
 427             child = readNormalizedNodeInternal();
 428         }
 429         return builder;
 430     }
 431 }