netconf/mdsal-netconf-connector/src/main/java/org/opendaylight/netconf/mdsal/connector/ops/get/AbstractGet.java

   1 /*
   2  * Copyright (c) 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.netconf.mdsal.connector.ops.get;
   9
  10 import com.google.common.annotations.VisibleForTesting;
  11 import com.google.common.collect.Iterables;
  12 import java.io.IOException;
  13 import java.util.Optional;
  14 import javax.xml.stream.XMLOutputFactory;
  15 import javax.xml.stream.XMLStreamException;
  16 import javax.xml.stream.XMLStreamWriter;
  17 import javax.xml.transform.dom.DOMResult;
  18 import org.opendaylight.netconf.api.DocumentedException;
  19 import org.opendaylight.netconf.api.DocumentedException.ErrorSeverity;
  20 import org.opendaylight.netconf.api.DocumentedException.ErrorTag;
  21 import org.opendaylight.netconf.api.DocumentedException.ErrorType;
  22 import org.opendaylight.netconf.api.xml.XmlElement;
  23 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
  24 import org.opendaylight.netconf.mdsal.connector.CurrentSchemaContext;
  25 import org.opendaylight.netconf.mdsal.connector.ops.Datastore;
  26 import org.opendaylight.netconf.util.mapping.AbstractSingletonNetconfOperation;
  27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  29 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  30 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  31 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  32 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  33 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  34 import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  35 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  36 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  37 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  38 import org.w3c.dom.Document;
  39 import org.w3c.dom.Element;
  40 import org.w3c.dom.Node;
  41
  42 public abstract class AbstractGet extends AbstractSingletonNetconfOperation {
  43     private static final XMLOutputFactory XML_OUTPUT_FACTORY;
  44     private static final YangInstanceIdentifier ROOT = YangInstanceIdentifier.EMPTY;
  45     private static final String FILTER = "filter";
  46
  47     static {
  48         XML_OUTPUT_FACTORY = XMLOutputFactory.newFactory();
  49         XML_OUTPUT_FACTORY.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, true);
  50     }
  51
  52     protected final CurrentSchemaContext schemaContext;
  53     private final FilterContentValidator validator;
  54
  55     public AbstractGet(final String netconfSessionIdForReporting, final CurrentSchemaContext schemaContext) {
  56         super(netconfSessionIdForReporting);
  57         this.schemaContext = schemaContext;
  58         this.validator = new FilterContentValidator(schemaContext);
  59     }
  60
  61     protected Node transformNormalizedNode(final Document document, final NormalizedNode<?, ?> data,
  62                                            final YangInstanceIdentifier dataRoot) {
  63         final DOMResult result = new DOMResult(document.createElement(XmlNetconfConstants.DATA_KEY));
  64
  65         final XMLStreamWriter xmlWriter = getXmlStreamWriter(result);
  66
  67         final NormalizedNodeStreamWriter nnStreamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter,
  68                 schemaContext.getCurrentContext(), getSchemaPath(dataRoot));
  69
  70         final NormalizedNodeWriter nnWriter = NormalizedNodeWriter.forStreamWriter(nnStreamWriter, true);
  71
  72         writeRootElement(xmlWriter, nnWriter, (ContainerNode) data);
  73         return result.getNode();
  74     }
  75
  76     private static XMLStreamWriter getXmlStreamWriter(final DOMResult result) {
  77         try {
  78             return XML_OUTPUT_FACTORY.createXMLStreamWriter(result);
  79         } catch (final XMLStreamException e) {
  80             throw new RuntimeException(e);
  81         }
  82     }
  83
  84     private static SchemaPath getSchemaPath(final YangInstanceIdentifier dataRoot) {
  85         return SchemaPath.create(
  86                 Iterables.transform(dataRoot.getPathArguments(), PathArgument::getNodeType), dataRoot.equals(ROOT));
  87     }
  88
  89     private static void writeRootElement(final XMLStreamWriter xmlWriter, final NormalizedNodeWriter nnWriter,
  90                                   final ContainerNode data) {
  91         try {
  92             if (data.getNodeType().equals(SchemaContext.NAME)) {
  93                 for (final DataContainerChild<? extends PathArgument, ?> child : data.getValue()) {
  94                     nnWriter.write(child);
  95                 }
  96             } else {
  97                 nnWriter.write(data);
  98             }
  99             nnWriter.flush();
 100             xmlWriter.flush();
 101         } catch (XMLStreamException | IOException e) {
 102             throw new RuntimeException(e);
 103         }
 104     }
 105
 106     protected Element serializeNodeWithParentStructure(final Document document, final YangInstanceIdentifier dataRoot,
 107                                                        final NormalizedNode<?, ?> node) {
 108         if (!dataRoot.equals(ROOT)) {
 109             return (Element) transformNormalizedNode(document,
 110                     ImmutableNodes.fromInstanceId(schemaContext.getCurrentContext(), dataRoot, node),
 111                     ROOT);
 112         }
 113         return (Element) transformNormalizedNode(document, node, ROOT);
 114     }
 115
 116     /**
 117      * Obtain data root according to filter from operation element.
 118      *
 119      * @param operationElement operation element
 120      * @return if filter is present and not empty returns Optional of the InstanceIdentifier to the read location
 121      *      in datastore. Empty filter returns Optional.absent() which should equal an empty &lt;data/&gt;
 122      *      container in the response. If filter is not present we want to read the entire datastore - return ROOT.
 123      * @throws DocumentedException if not possible to get identifier from filter
 124      */
 125     protected Optional<YangInstanceIdentifier> getDataRootFromFilter(final XmlElement operationElement)
 126             throws DocumentedException {
 127         final Optional<XmlElement> filterElement = operationElement.getOnlyChildElementOptionally(FILTER);
 128         if (filterElement.isPresent()) {
 129             if (filterElement.get().getChildElements().size() == 0) {
 130                 return Optional.empty();
 131             }
 132             return Optional.of(getInstanceIdentifierFromFilter(filterElement.get()));
 133         }
 134
 135         return Optional.of(ROOT);
 136     }
 137
 138     @VisibleForTesting
 139     protected YangInstanceIdentifier getInstanceIdentifierFromFilter(final XmlElement filterElement)
 140             throws DocumentedException {
 141
 142         if (filterElement.getChildElements().size() != 1) {
 143             throw new DocumentedException("Multiple filter roots not supported yet",
 144                     ErrorType.APPLICATION, ErrorTag.OPERATION_NOT_SUPPORTED, ErrorSeverity.ERROR);
 145         }
 146
 147         final XmlElement element = filterElement.getOnlyChildElement();
 148         return validator.validate(element);
 149     }
 150
 151     protected static final class GetConfigExecution {
 152         private final Optional<Datastore> datastore;
 153
 154         GetConfigExecution(final Optional<Datastore> datastore) {
 155             this.datastore = datastore;
 156         }
 157
 158         static GetConfigExecution fromXml(final XmlElement xml, final String operationName) throws DocumentedException {
 159             try {
 160                 validateInputRpc(xml, operationName);
 161             } catch (final DocumentedException e) {
 162                 throw new DocumentedException("Incorrect RPC: " + e.getMessage(), e, e.getErrorType(), e.getErrorTag(),
 163                         e.getErrorSeverity(), e.getErrorInfo());
 164             }
 165
 166             final Optional<Datastore> sourceDatastore;
 167             try {
 168                 sourceDatastore = parseSource(xml);
 169             } catch (final DocumentedException e) {
 170                 throw new DocumentedException("Get-config source attribute error: " + e.getMessage(), e,
 171                         e.getErrorType(), e.getErrorTag(), e.getErrorSeverity(), e.getErrorInfo());
 172             }
 173
 174             return new GetConfigExecution(sourceDatastore);
 175         }
 176
 177         private static Optional<Datastore> parseSource(final XmlElement xml) throws DocumentedException {
 178             final Optional<XmlElement> sourceElement = xml.getOnlyChildElementOptionally(XmlNetconfConstants.SOURCE_KEY,
 179                     XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0);
 180             return sourceElement.isPresent()
 181                     ? Optional.of(Datastore.valueOf(sourceElement.get().getOnlyChildElement().getName()))
 182                     : Optional.empty();
 183         }
 184
 185         private static void validateInputRpc(final XmlElement xml, final String operationName) throws
 186                 DocumentedException {
 187             xml.checkName(operationName);
 188             xml.checkNamespace(XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0);
 189         }
 190
 191         public Optional<Datastore> getDatastore() {
 192             return datastore;
 193         }
 194
 195     }
 196
 197 }