netconf/netconf-util/src/main/java/org/opendaylight/netconf/util/NetconfUtil.java

   1 /*
   2  * Copyright (c) 2013 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.util;
   9
  10 import static com.google.common.base.Preconditions.checkState;
  11
  12 import java.io.IOException;
  13 import java.net.URISyntaxException;
  14 import java.util.Iterator;
  15 import javax.xml.stream.XMLOutputFactory;
  16 import javax.xml.stream.XMLStreamException;
  17 import javax.xml.stream.XMLStreamWriter;
  18 import javax.xml.transform.dom.DOMResult;
  19 import javax.xml.transform.dom.DOMSource;
  20 import org.eclipse.jdt.annotation.Nullable;
  21 import org.opendaylight.netconf.api.DocumentedException;
  22 import org.opendaylight.netconf.api.xml.XmlElement;
  23 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
  24 import org.opendaylight.netconf.api.xml.XmlUtil;
  25 import org.opendaylight.yangtools.rcf8528.data.util.EmptyMountPointContext;
  26 import org.opendaylight.yangtools.rfc7952.data.api.NormalizedMetadata;
  27 import org.opendaylight.yangtools.rfc7952.data.util.NormalizedMetadataWriter;
  28 import org.opendaylight.yangtools.rfc8528.data.api.MountPointContext;
  29 import org.opendaylight.yangtools.yang.common.QName;
  30 import org.opendaylight.yangtools.yang.common.QNameModule;
  31 import org.opendaylight.yangtools.yang.common.Revision;
  32 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  33 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  34 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  35 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  36 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  37 import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  38 import org.opendaylight.yangtools.yang.data.codec.xml.XmlCodecFactory;
  39 import org.opendaylight.yangtools.yang.data.codec.xml.XmlParserStream;
  40 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  41 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  42 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
  43 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  44 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  45 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  46 import org.slf4j.Logger;
  47 import org.slf4j.LoggerFactory;
  48 import org.w3c.dom.Document;
  49 import org.xml.sax.SAXException;
  50
  51 public final class NetconfUtil {
  52     private static final Logger LOG = LoggerFactory.getLogger(NetconfUtil.class);
  53
  54     // FIXME: document what exactly this QName means, as it is not referring to a tangible node nor the ietf-module.
  55     // FIXME: what is this contract saying?
  56     //        - is it saying all data is going to be interpreted with this root?
  57     //        - is this saying we are following a specific interface contract (i.e. do we have schema mounts?)
  58     //        - is it also inferring some abilities w.r.t. RFC8342?
  59     public static final QName NETCONF_QNAME = QName.create(QNameModule.create(SchemaContext.NAME.getNamespace(),
  60         Revision.of("2011-06-01")), "netconf").intern();
  61     // FIXME: is this the device-bound revision?
  62     public static final QName NETCONF_DATA_QNAME = QName.create(NETCONF_QNAME, "data").intern();
  63     public static final XMLOutputFactory XML_FACTORY;
  64
  65     static {
  66         final XMLOutputFactory f = XMLOutputFactory.newFactory();
  67         // FIXME: not repairing namespaces is probably common, this should be availabe as common XML constant.
  68         f.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, false);
  69         XML_FACTORY = f;
  70     }
  71
  72     private NetconfUtil() {
  73         // No-op
  74     }
  75
  76     public static Document checkIsMessageOk(final Document response) throws DocumentedException {
  77         final XmlElement docElement = XmlElement.fromDomDocument(response);
  78         // FIXME: we should throw DocumentedException here
  79         checkState(XmlNetconfConstants.RPC_REPLY_KEY.equals(docElement.getName()));
  80         final XmlElement element = docElement.getOnlyChildElement();
  81         if (XmlNetconfConstants.OK.equals(element.getName())) {
  82             return response;
  83         }
  84
  85         LOG.warn("Can not load last configuration. Operation failed.");
  86         // FIXME: we should be throwing a DocumentedException here
  87         throw new IllegalStateException("Can not load last configuration. Operation failed: "
  88                 + XmlUtil.toString(response));
  89     }
  90
  91     @SuppressWarnings("checkstyle:IllegalCatch")
  92     public static void writeNormalizedNode(final NormalizedNode<?, ?> normalized, final DOMResult result,
  93                                            final SchemaPath schemaPath, final SchemaContext context)
  94             throws IOException, XMLStreamException {
  95         final XMLStreamWriter writer = XML_FACTORY.createXMLStreamWriter(result);
  96         try (
  97              NormalizedNodeStreamWriter normalizedNodeStreamWriter =
  98                      XMLStreamNormalizedNodeStreamWriter.create(writer, context, schemaPath);
  99              NormalizedNodeWriter normalizedNodeWriter =
 100                      NormalizedNodeWriter.forStreamWriter(normalizedNodeStreamWriter)
 101         ) {
 102             normalizedNodeWriter.write(normalized);
 103             normalizedNodeWriter.flush();
 104         } finally {
 105             try {
 106                 if (writer != null) {
 107                     writer.close();
 108                 }
 109             } catch (final Exception e) {
 110                 LOG.warn("Unable to close resource properly", e);
 111             }
 112         }
 113     }
 114
 115     @SuppressWarnings("checkstyle:IllegalCatch")
 116     public static void writeNormalizedNode(final NormalizedNode<?, ?> normalized,
 117                                            final @Nullable NormalizedMetadata metadata,
 118                                            final DOMResult result, final SchemaPath schemaPath,
 119                                            final SchemaContext context) throws IOException, XMLStreamException {
 120         if (metadata == null) {
 121             writeNormalizedNode(normalized, result, schemaPath, context);
 122             return;
 123         }
 124
 125         final XMLStreamWriter writer = XML_FACTORY.createXMLStreamWriter(result);
 126         try (
 127              NormalizedNodeStreamWriter normalizedNodeStreamWriter =
 128                      XMLStreamNormalizedNodeStreamWriter.create(writer, context, schemaPath);
 129                 NormalizedMetadataWriter normalizedNodeWriter =
 130                      NormalizedMetadataWriter.forStreamWriter(normalizedNodeStreamWriter)
 131         ) {
 132             normalizedNodeWriter.write(normalized, metadata);
 133             normalizedNodeWriter.flush();
 134         } finally {
 135             try {
 136                 if (writer != null) {
 137                     writer.close();
 138                 }
 139             } catch (final Exception e) {
 140                 LOG.warn("Unable to close resource properly", e);
 141             }
 142         }
 143     }
 144
 145     public static void writeFilter(final YangInstanceIdentifier query, final DOMResult result,
 146             final SchemaPath schemaPath, final SchemaContext context) throws IOException, XMLStreamException {
 147         if (query.isEmpty()) {
 148             // No query at all
 149             return;
 150         }
 151
 152         final XMLStreamWriter xmlWriter = XML_FACTORY.createXMLStreamWriter(result);
 153         try {
 154             try (NormalizedNodeStreamWriter writer =
 155                     XMLStreamNormalizedNodeStreamWriter.create(xmlWriter, context, schemaPath)) {
 156                 final Iterator<PathArgument> it = query.getPathArguments().iterator();
 157                 final PathArgument first = it.next();
 158                 StreamingContext.fromSchemaAndQNameChecked(context, first.getNodeType()).streamToWriter(writer, first,
 159                     it);
 160             }
 161         } finally {
 162             xmlWriter.close();
 163         }
 164     }
 165
 166     public static NormalizedNodeResult transformDOMSourceToNormalizedNode(final MountPointContext mountContext,
 167             final DOMSource value) throws XMLStreamException, URISyntaxException, IOException, SAXException {
 168         final NormalizedNodeResult resultHolder = new NormalizedNodeResult();
 169         final NormalizedNodeStreamWriter writer = ImmutableNormalizedNodeStreamWriter.from(resultHolder);
 170         final XmlCodecFactory codecs = XmlCodecFactory.create(mountContext);
 171
 172         // FIXME: we probably need to propagate MountPointContext here and not just the child nodes
 173         final ContainerSchemaNode dataRead = new NodeContainerProxy(NETCONF_DATA_QNAME,
 174             mountContext.getSchemaContext().getChildNodes());
 175         try (XmlParserStream xmlParserStream = XmlParserStream.create(writer, codecs, dataRead)) {
 176             xmlParserStream.traverse(value);
 177         }
 178         return resultHolder;
 179     }
 180
 181
 182     // FIXME: document this interface contract. Does it support RFC8528/RFC8542? How?
 183     public static NormalizedNodeResult transformDOMSourceToNormalizedNode(final EffectiveModelContext schemaContext,
 184             final DOMSource value) throws XMLStreamException, URISyntaxException, IOException, SAXException {
 185         return transformDOMSourceToNormalizedNode(new EmptyMountPointContext(schemaContext), value);
 186     }
 187 }