2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.protocol.bgp.parser.spi.pojo;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.base.Preconditions;
13 import io.netty.buffer.ByteBuf;
14 import java.util.ArrayList;
15 import java.util.LinkedHashMap;
16 import java.util.List;
18 import java.util.Map.Entry;
19 import java.util.TreeMap;
20 import java.util.concurrent.atomic.AtomicReference;
21 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
22 import org.opendaylight.protocol.bgp.parser.BGPError;
23 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
24 import org.opendaylight.protocol.bgp.parser.BGPTreatAsWithdrawException;
25 import org.opendaylight.protocol.bgp.parser.spi.AttributeParser;
26 import org.opendaylight.protocol.bgp.parser.spi.AttributeRegistry;
27 import org.opendaylight.protocol.bgp.parser.spi.AttributeSerializer;
28 import org.opendaylight.protocol.bgp.parser.spi.ParsedAttributes;
29 import org.opendaylight.protocol.bgp.parser.spi.PeerSpecificParserConstraint;
30 import org.opendaylight.protocol.bgp.parser.spi.RevisedErrorHandling;
31 import org.opendaylight.protocol.concepts.AbstractRegistration;
32 import org.opendaylight.protocol.concepts.HandlerRegistry;
33 import org.opendaylight.protocol.util.BitArray;
34 import org.opendaylight.protocol.util.ByteArray;
35 import org.opendaylight.protocol.util.Values;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.path.attributes.Attributes;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.path.attributes.AttributesBuilder;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.path.attributes.attributes.UnrecognizedAttributes;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.path.attributes.attributes.UnrecognizedAttributesBuilder;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.path.attributes.attributes.UnrecognizedAttributesKey;
41 import org.opendaylight.yangtools.yang.binding.DataContainer;
42 import org.opendaylight.yangtools.yang.binding.DataObject;
43 import org.slf4j.Logger;
44 import org.slf4j.LoggerFactory;
46 final class SimpleAttributeRegistry implements AttributeRegistry {
48 private static final class RawAttribute {
49 private final AttributeParser parser;
50 private final ByteBuf buffer;
52 RawAttribute(final AttributeParser parser, final ByteBuf buffer) {
53 this.parser = requireNonNull(parser);
54 this.buffer = requireNonNull(buffer);
58 private static final Logger LOG = LoggerFactory.getLogger(SimpleAttributeRegistry.class);
59 private static final int OPTIONAL_BIT = 0;
60 private static final int TRANSITIVE_BIT = 1;
61 private static final int PARTIAL_BIT = 2;
62 private static final int EXTENDED_LENGTH_BIT = 3;
64 private final HandlerRegistry<DataContainer, AttributeParser, AttributeSerializer> handlers =
65 new HandlerRegistry<>();
66 private final Map<AbstractRegistration, AttributeSerializer> serializers = new LinkedHashMap<>();
67 private final AtomicReference<Iterable<AttributeSerializer>> roSerializers =
68 new AtomicReference<>(this.serializers.values());
69 private final List<UnrecognizedAttributes> unrecognizedAttributes = new ArrayList<>();
72 AutoCloseable registerAttributeParser(final int attributeType, final AttributeParser parser) {
73 Preconditions.checkArgument(attributeType >= 0 && attributeType <= Values.UNSIGNED_BYTE_MAX_VALUE);
74 return this.handlers.registerParser(attributeType, parser);
77 synchronized AutoCloseable registerAttributeSerializer(final Class<? extends DataObject> paramClass,
78 final AttributeSerializer serializer) {
79 final AbstractRegistration reg = this.handlers.registerSerializer(paramClass, serializer);
81 this.serializers.put(reg, serializer);
82 return new AbstractRegistration() {
84 protected void removeRegistration() {
85 synchronized (SimpleAttributeRegistry.this) {
86 SimpleAttributeRegistry.this.serializers.remove(reg);
87 SimpleAttributeRegistry.this.roSerializers.set(SimpleAttributeRegistry.this.serializers.values());
94 private void addAttribute(final ByteBuf buffer, final RevisedErrorHandling errorHandling,
95 final Map<Integer, RawAttribute> attributes) throws BGPDocumentedException {
96 final BitArray flags = BitArray.valueOf(buffer.readByte());
97 final int type = buffer.readUnsignedByte();
98 final int len = flags.get(EXTENDED_LENGTH_BIT) ? buffer.readUnsignedShort() : buffer.readUnsignedByte();
99 final AttributeParser parser = this.handlers.getParser(type);
100 if (attributes.containsKey(type)) {
101 if (parser != null && !parser.ignoreDuplicates(errorHandling)) {
102 throw new BGPDocumentedException("Duplicate attribute " + type, BGPError.MALFORMED_ATTR_LIST);
104 LOG.debug("Ignoring duplicate attribute type {}", type);
108 if (parser == null) {
109 processUnrecognized(flags, type, buffer, len);
111 attributes.put(type, new RawAttribute(parser, buffer.readSlice(len)));
115 private void processUnrecognized(final BitArray flags, final int type, final ByteBuf buffer, final int len)
116 throws BGPDocumentedException {
117 if (!flags.get(OPTIONAL_BIT)) {
118 throw new BGPDocumentedException("Well known attribute not recognized.",
119 BGPError.WELL_KNOWN_ATTR_NOT_RECOGNIZED);
121 final UnrecognizedAttributes unrecognizedAttribute = new UnrecognizedAttributesBuilder()
122 .withKey(new UnrecognizedAttributesKey((short) type))
123 .setPartial(flags.get(PARTIAL_BIT))
124 .setTransitive(flags.get(TRANSITIVE_BIT))
125 .setType((short) type)
126 .setValue(ByteArray.readBytes(buffer, len)).build();
127 this.unrecognizedAttributes.add(unrecognizedAttribute);
128 LOG.debug("Unrecognized attribute were parsed: {}", unrecognizedAttribute);
132 public ParsedAttributes parseAttributes(final ByteBuf buffer, final PeerSpecificParserConstraint constraint)
133 throws BGPDocumentedException, BGPParsingException {
134 final RevisedErrorHandling errorHandling = RevisedErrorHandling.from(constraint);
135 final Map<Integer, RawAttribute> attributes = new TreeMap<>();
136 while (buffer.isReadable()) {
137 addAttribute(buffer, errorHandling, attributes);
141 * TreeMap guarantees that we will be invoking the parser in the order
142 * of increasing attribute type.
144 // We may have multiple attribute errors, each specifying a withdraw. We need to finish parsing the message
145 // all attributes before we can decide whether we can discard attributes, or whether we need to terminate
147 final AttributesBuilder builder = new AttributesBuilder();
148 BGPTreatAsWithdrawException withdrawCause = null;
149 for (final Entry<Integer, RawAttribute> entry : attributes.entrySet()) {
150 LOG.debug("Parsing attribute type {}", entry.getKey());
152 final RawAttribute a = entry.getValue();
154 a.parser.parseAttribute(a.buffer, builder, errorHandling, constraint);
155 } catch (BGPTreatAsWithdrawException e) {
156 LOG.info("Attribute {} indicated treat-as-withdraw", entry.getKey(), e);
157 if (withdrawCause == null) {
160 withdrawCause.addSuppressed(e);
164 builder.setUnrecognizedAttributes(this.unrecognizedAttributes);
165 return new ParsedAttributes(builder.build(), withdrawCause);
169 public void serializeAttribute(final Attributes attribute,final ByteBuf byteAggregator) {
170 for (final AttributeSerializer serializer : this.roSerializers.get()) {
171 serializer.serializeAttribute(attribute, byteAggregator);