9c4df2b9b1eeedf91a9af2c49aba6c84ee1b70b8
[netconf.git] / netconf / netconf-util / src / main / java / org / opendaylight / netconf / util / messages / SendErrorExceptionUtil.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
9 package org.opendaylight.netconf.util.messages;
10
11 import com.google.common.base.Preconditions;
12 import io.netty.channel.Channel;
13 import io.netty.channel.ChannelFuture;
14 import io.netty.channel.ChannelFutureListener;
15 import org.opendaylight.netconf.api.DocumentedException;
16 import org.opendaylight.netconf.api.NetconfMessage;
17 import org.opendaylight.netconf.api.NetconfSession;
18 import org.opendaylight.netconf.api.xml.XmlNetconfConstants;
19 import org.opendaylight.netconf.api.xml.XmlUtil;
20 import org.slf4j.Logger;
21 import org.slf4j.LoggerFactory;
22 import org.w3c.dom.Attr;
23 import org.w3c.dom.Document;
24 import org.w3c.dom.Element;
25 import org.w3c.dom.NamedNodeMap;
26
27 public final class SendErrorExceptionUtil {
28     private static final Logger LOG = LoggerFactory.getLogger(SendErrorExceptionUtil.class);
29
30     private SendErrorExceptionUtil() {}
31
32     public static void sendErrorMessage(final NetconfSession session,
33             final DocumentedException sendErrorException) {
34         LOG.trace("Sending error {}", sendErrorException.getMessage(), sendErrorException);
35         final Document errorDocument = createDocument(sendErrorException);
36         ChannelFuture channelFuture = session.sendMessage(new NetconfMessage(errorDocument));
37         channelFuture.addListener(new SendErrorVerifyingListener(sendErrorException));
38     }
39
40     public static void sendErrorMessage(final Channel channel, final DocumentedException sendErrorException) {
41         LOG.trace("Sending error {}", sendErrorException.getMessage(), sendErrorException);
42         final Document errorDocument = createDocument(sendErrorException);
43         ChannelFuture channelFuture = channel.writeAndFlush(new NetconfMessage(errorDocument));
44         channelFuture.addListener(new SendErrorVerifyingListener(sendErrorException));
45     }
46
47     public static void sendErrorMessage(final NetconfSession session, final DocumentedException sendErrorException,
48             final NetconfMessage incommingMessage) {
49         final Document errorDocument = createDocument(sendErrorException);
50         if (LOG.isTraceEnabled()) {
51             LOG.trace("Sending error {}", XmlUtil.toString(errorDocument));
52         }
53
54         tryToCopyAttributes(incommingMessage.getDocument(), errorDocument, sendErrorException);
55         ChannelFuture channelFuture = session.sendMessage(new NetconfMessage(errorDocument));
56         channelFuture.addListener(new SendErrorVerifyingListener(sendErrorException));
57     }
58
59     @SuppressWarnings("checkstyle:IllegalCatch")
60     private static void tryToCopyAttributes(final Document incommingDocument, final Document errorDocument,
61             final DocumentedException sendErrorException) {
62         try {
63             final Element incommingRpc = incommingDocument.getDocumentElement();
64             Preconditions.checkState(
65                 XmlNetconfConstants.RPC_KEY.equals(incommingRpc.getLocalName())
66                 && XmlNetconfConstants.URN_IETF_PARAMS_XML_NS_NETCONF_BASE_1_0.equals(incommingRpc.getNamespaceURI()),
67                     "Missing %s element", XmlNetconfConstants.RPC_KEY);
68
69             final Element rpcReply = errorDocument.getDocumentElement();
70             Preconditions.checkState(rpcReply.getTagName().equals(XmlNetconfConstants.RPC_REPLY_KEY),
71                     "Missing %s element", XmlNetconfConstants.RPC_REPLY_KEY);
72
73             final NamedNodeMap incomingAttributes = incommingRpc.getAttributes();
74             for (int i = 0; i < incomingAttributes.getLength(); i++) {
75                 final Attr attr = (Attr) incomingAttributes.item(i);
76                 // skip namespace
77                 if (attr.getNodeName().equals(XmlUtil.XMLNS_ATTRIBUTE_KEY)) {
78                     continue;
79                 }
80                 rpcReply.setAttributeNode((Attr) errorDocument.importNode(attr, true));
81             }
82         } catch (final Exception e) {
83             LOG.warn("Unable to copy incomming attributes to {}, returned rpc-error might be invalid for client",
84                     sendErrorException, e);
85         }
86     }
87
88     private static Document createDocument(final DocumentedException sendErrorException) {
89         return sendErrorException.toXMLDocument();
90     }
91
92     /**
93      * Checks if netconf error was sent successfully.
94      */
95     private static final class SendErrorVerifyingListener implements ChannelFutureListener {
96         private final DocumentedException sendErrorException;
97
98         SendErrorVerifyingListener(final DocumentedException sendErrorException) {
99             this.sendErrorException = sendErrorException;
100         }
101
102         @Override
103         public void operationComplete(final ChannelFuture channelFuture) throws Exception {
104             Preconditions.checkState(channelFuture.isSuccess(), "Unable to send exception %s", sendErrorException,
105                     channelFuture.cause());
106         }
107     }
108 }