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

   1 /*
   2  * Copyright (c) 2018 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;
   9
  10 import static org.opendaylight.netconf.api.xml.XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0;
  11
  12 import java.io.IOException;
  13 import java.net.URI;
  14 import java.net.URISyntaxException;
  15 import java.nio.charset.StandardCharsets;
  16 import java.nio.file.Files;
  17 import java.nio.file.Path;
  18 import java.nio.file.Paths;
  19 import java.util.List;
  20 import java.util.Optional;
  21 import java.util.concurrent.ExecutionException;
  22 import javax.xml.stream.XMLOutputFactory;
  23 import javax.xml.stream.XMLStreamException;
  24 import javax.xml.stream.XMLStreamWriter;
  25 import javax.xml.transform.dom.DOMResult;
  26 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  27 import org.opendaylight.mdsal.dom.api.DOMDataTreeReadWriteTransaction;
  28 import org.opendaylight.netconf.api.DocumentedException;
  29 import org.opendaylight.netconf.api.DocumentedException.ErrorSeverity;
  30 import org.opendaylight.netconf.api.DocumentedException.ErrorTag;
  31 import org.opendaylight.netconf.api.DocumentedException.ErrorType;
  32 import org.opendaylight.netconf.api.xml.XmlElement;
  33 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
  34 import org.opendaylight.netconf.api.xml.XmlUtil;
  35 import org.opendaylight.netconf.mdsal.connector.CurrentSchemaContext;
  36 import org.opendaylight.netconf.mdsal.connector.TransactionProvider;
  37 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  38 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  39 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  40 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  41 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
  42 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
  43 import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
  44 import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
  45 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
  46 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
  47 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  48 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  49 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  50 import org.w3c.dom.Document;
  51 import org.w3c.dom.Element;
  52 import org.w3c.dom.Node;
  53
  54 public final class CopyConfig extends AbstractEdit {
  55     private static final String OPERATION_NAME = "copy-config";
  56     private static final String SOURCE_KEY = "source";
  57     private static final XMLOutputFactory XML_OUTPUT_FACTORY;
  58
  59     static {
  60         XML_OUTPUT_FACTORY = XMLOutputFactory.newFactory();
  61         XML_OUTPUT_FACTORY.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, true);
  62     }
  63
  64     // Top-level "data" node without child nodes
  65     private static final ContainerNode EMPTY_ROOT_NODE = Builders.containerBuilder()
  66         .withNodeIdentifier(new YangInstanceIdentifier.NodeIdentifier(SchemaContext.NAME)).build();
  67
  68     private final TransactionProvider transactionProvider;
  69
  70     public CopyConfig(final String netconfSessionIdForReporting, final CurrentSchemaContext schemaContext,
  71                       final TransactionProvider transactionProvider) {
  72         super(netconfSessionIdForReporting, schemaContext);
  73         this.transactionProvider = transactionProvider;
  74     }
  75
  76     @Override
  77     protected Element handleWithNoSubsequentOperations(final Document document, final XmlElement operationElement)
  78         throws DocumentedException {
  79         final XmlElement targetElement = extractTargetElement(operationElement, OPERATION_NAME);
  80         final String target = targetElement.getName();
  81         if (Datastore.running.toString().equals(target)) {
  82             throw new DocumentedException("edit-config on running datastore is not supported",
  83                 ErrorType.PROTOCOL,
  84                 ErrorTag.OPERATION_NOT_SUPPORTED,
  85                 ErrorSeverity.ERROR);
  86         } else if (Datastore.candidate.toString().equals(target)) {
  87             copyToCandidate(operationElement);
  88         } else if (URL_KEY.equals(target)) {
  89             copyToUrl(targetElement, operationElement);
  90         } else {
  91             throw new DocumentedException("Unsupported target: " + target,
  92                 ErrorType.PROTOCOL,
  93                 ErrorTag.BAD_ELEMENT,
  94                 ErrorSeverity.ERROR);
  95         }
  96         return document.createElement(XmlNetconfConstants.OK);
  97     }
  98
  99     private void copyToCandidate(final XmlElement operationElement)
 100         throws DocumentedException {
 101         final XmlElement source = getSourceElement(operationElement);
 102         final List<XmlElement> configElements = getConfigElement(source).getChildElements();
 103
 104         // <copy-config>, unlike <edit-config>, always replaces entire configuration,
 105         // so remove old configuration first:
 106         final DOMDataTreeReadWriteTransaction rwTx = transactionProvider.getOrCreateTransaction();
 107         rwTx.put(LogicalDatastoreType.CONFIGURATION, YangInstanceIdentifier.EMPTY, EMPTY_ROOT_NODE);
 108
 109         // Then create nodes present in the <config> element:
 110         for (final XmlElement element : configElements) {
 111             final String ns = element.getNamespace();
 112             final DataSchemaNode schemaNode = getSchemaNodeFromNamespace(ns, element);
 113             final NormalizedNodeResult resultHolder = new NormalizedNodeResult();
 114             parseIntoNormalizedNode(schemaNode, element, ImmutableNormalizedNodeStreamWriter.from(resultHolder));
 115             final NormalizedNode<?, ?> data = resultHolder.getResult();
 116             final YangInstanceIdentifier path = YangInstanceIdentifier.create(data.getIdentifier());
 117             // Doing merge instead of put to support top-level list:
 118             rwTx.merge(LogicalDatastoreType.CONFIGURATION, path, data);
 119         }
 120     }
 121
 122     private static XmlElement getSourceElement(final XmlElement parent) throws DocumentedException {
 123         final Optional<XmlElement> sourceElement = parent.getOnlyChildElementOptionally(SOURCE_KEY);
 124         if (!sourceElement.isPresent()) {
 125             throw new DocumentedException("<source> element is missing",
 126                 DocumentedException.ErrorType.PROTOCOL,
 127                 DocumentedException.ErrorTag.MISSING_ELEMENT,
 128                 DocumentedException.ErrorSeverity.ERROR);
 129         }
 130
 131         return sourceElement.get();
 132     }
 133
 134     private void copyToUrl(final XmlElement urlElement, final XmlElement operationElement) throws DocumentedException {
 135         final String url = urlElement.getTextContent();
 136         if (!url.startsWith("file:")) {
 137             throw new DocumentedException("Unsupported <url> protocol: " + url,
 138                 ErrorType.PROTOCOL,
 139                 ErrorTag.OPERATION_NOT_SUPPORTED,
 140                 ErrorSeverity.ERROR);
 141         }
 142
 143         // Read data from datastore:
 144         final XmlElement source = getSourceElement(operationElement).getOnlyChildElement();
 145         final ContainerNode data = readData(source);
 146
 147         // Transform NN to XML:
 148         final Document document = operationElement.getDomElement().getOwnerDocument();
 149         final Node node = transformNormalizedNode(document, data);
 150
 151         // Save XML to file:
 152         final String xml = XmlUtil.toString((Element) node);
 153         try {
 154             final Path file = Paths.get(new URI(url));
 155             Files.write(file, xml.getBytes(StandardCharsets.UTF_8));
 156         } catch (URISyntaxException | IllegalArgumentException e) {
 157             throw new DocumentedException("Invalid URI: " + url, e,
 158                 ErrorType.RPC,
 159                 ErrorTag.INVALID_VALUE,
 160                 ErrorSeverity.ERROR);
 161         } catch (IOException e) {
 162             throw new DocumentedException("Failed to write : " + url, e,
 163                 ErrorType.APPLICATION,
 164                 ErrorTag.OPERATION_FAILED,
 165                 ErrorSeverity.ERROR);
 166         }
 167     }
 168
 169     private ContainerNode readData(final XmlElement source) throws DocumentedException {
 170         final Datastore sourceDatastore = getDatastore(source);
 171         final DOMDataTreeReadWriteTransaction rwTx = getTransaction(sourceDatastore);
 172         final YangInstanceIdentifier dataRoot = YangInstanceIdentifier.EMPTY;
 173         try {
 174             final java.util.Optional<NormalizedNode<?, ?>> normalizedNodeOptional = rwTx.read(
 175                 LogicalDatastoreType.CONFIGURATION, dataRoot).get();
 176             if (sourceDatastore == Datastore.running) {
 177                 transactionProvider.abortRunningTransaction(rwTx);
 178             }
 179             return (ContainerNode) normalizedNodeOptional.get();
 180         } catch (InterruptedException | ExecutionException e) {
 181             throw new IllegalStateException("Unable to read data " + dataRoot, e);
 182         }
 183     }
 184
 185     private static Datastore getDatastore(final XmlElement source) throws DocumentedException {
 186         try {
 187             return Datastore.valueOf(source.getName());
 188         } catch (IllegalArgumentException e) {
 189             throw new DocumentedException("Unsupported source for <url> target", e,
 190                 ErrorType.PROTOCOL,
 191                 ErrorTag.OPERATION_NOT_SUPPORTED,
 192                 ErrorSeverity.ERROR);
 193         }
 194     }
 195
 196     private DOMDataTreeReadWriteTransaction getTransaction(final Datastore datastore) throws DocumentedException {
 197         if (datastore == Datastore.candidate) {
 198             return transactionProvider.getOrCreateTransaction();
 199         } else if (datastore == Datastore.running) {
 200             return transactionProvider.createRunningTransaction();
 201         }
 202         throw new DocumentedException("Incorrect Datastore: ", ErrorType.PROTOCOL, ErrorTag.BAD_ELEMENT,
 203             ErrorSeverity.ERROR);
 204     }
 205
 206     private Node transformNormalizedNode(final Document document, final ContainerNode data) {
 207         final Element configElement = document.createElementNS(URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0, CONFIG_KEY);
 208         final DOMResult result = new DOMResult(configElement);
 209         try {
 210             final XMLStreamWriter xmlWriter = XML_OUTPUT_FACTORY.createXMLStreamWriter(result);
 211             final NormalizedNodeStreamWriter nnStreamWriter = XMLStreamNormalizedNodeStreamWriter.create(xmlWriter,
 212                 schemaContext.getCurrentContext(), SchemaPath.ROOT);
 213
 214             final NormalizedNodeWriter nnWriter = NormalizedNodeWriter.forStreamWriter(nnStreamWriter, true);
 215             for (DataContainerChild<? extends YangInstanceIdentifier.PathArgument, ?> child : data.getValue()) {
 216                 nnWriter.write(child);
 217             }
 218             nnWriter.flush();
 219             xmlWriter.flush();
 220         } catch (XMLStreamException | IOException e) {
 221             throw new RuntimeException(e);
 222         }
 223         return result.getNode();
 224     }
 225
 226     @Override
 227     protected String getOperationName() {
 228         return OPERATION_NAME;
 229     }
 230 }