opendaylight/md-sal/sal-netconf-connector/src/main/java/org/opendaylight/controller/sal/connect/netconf/listener/NetconfSessionCapabilities.java

   1 package org.opendaylight.controller.sal.connect.netconf.listener;
   2
   3 import com.google.common.base.Objects;
   4 import com.google.common.base.Optional;
   5 import com.google.common.base.Preconditions;
   6 import com.google.common.base.Predicate;
   7 import com.google.common.base.Splitter;
   8 import com.google.common.collect.ImmutableSet;
   9 import com.google.common.collect.Iterables;
  10 import com.google.common.collect.Sets;
  11 import java.net.URI;
  12 import java.util.Collection;
  13 import java.util.HashSet;
  14 import java.util.Set;
  15 import org.opendaylight.controller.netconf.client.NetconfClientSession;
  16 import org.opendaylight.controller.sal.connect.netconf.util.NetconfMessageTransformUtil;
  17 import org.opendaylight.yangtools.yang.common.QName;
  18 import org.slf4j.Logger;
  19 import org.slf4j.LoggerFactory;
  20
  21 public final class NetconfSessionCapabilities {
  22
  23     private static final class ParameterMatcher {
  24         private final Predicate<String> predicate;
  25         private final int skipLength;
  26
  27         ParameterMatcher(final String name) {
  28             predicate = new Predicate<String>() {
  29                 @Override
  30                 public boolean apply(final String input) {
  31                     return input.startsWith(name);
  32                 }
  33             };
  34
  35             this.skipLength = name.length();
  36         }
  37
  38         private String from(final Iterable<String> params) {
  39             final Optional<String> o = Iterables.tryFind(params, predicate);
  40             if (!o.isPresent()) {
  41                 return null;
  42             }
  43
  44             return o.get().substring(skipLength);
  45         }
  46     }
  47
  48     private static final Logger LOG = LoggerFactory.getLogger(NetconfSessionCapabilities.class);
  49     private static final ParameterMatcher MODULE_PARAM = new ParameterMatcher("module=");
  50     private static final ParameterMatcher REVISION_PARAM = new ParameterMatcher("revision=");
  51     private static final ParameterMatcher BROKEN_REVISON_PARAM = new ParameterMatcher("amp;revision=");
  52     private static final Splitter AMP_SPLITTER = Splitter.on('&');
  53     private static final Predicate<String> CONTAINS_REVISION = new Predicate<String>() {
  54         @Override
  55         public boolean apply(final String input) {
  56             return input.contains("revision=");
  57         }
  58     };
  59
  60     private final Set<QName> moduleBasedCaps;
  61     private final Set<String> nonModuleCaps;
  62
  63     private NetconfSessionCapabilities(final Set<String> nonModuleCaps, final Set<QName> moduleBasedCaps) {
  64         this.nonModuleCaps = Preconditions.checkNotNull(nonModuleCaps);
  65         this.moduleBasedCaps = Preconditions.checkNotNull(moduleBasedCaps);
  66     }
  67
  68     public Set<QName> getModuleBasedCaps() {
  69         return moduleBasedCaps;
  70     }
  71
  72     public Set<String> getNonModuleCaps() {
  73         return nonModuleCaps;
  74     }
  75
  76     public boolean containsNonModuleCapability(final String capability) {
  77         return nonModuleCaps.contains(capability);
  78     }
  79
  80     public boolean containsModuleCapability(final QName capability) {
  81         return moduleBasedCaps.contains(capability);
  82     }
  83
  84     @Override
  85     public String toString() {
  86         return Objects.toStringHelper(this)
  87                 .add("capabilities", nonModuleCaps)
  88                 .add("moduleBasedCapabilities", moduleBasedCaps)
  89                 .add("rollback", isRollbackSupported())
  90                 .add("monitoring", isMonitoringSupported())
  91                 .toString();
  92     }
  93
  94     public boolean isRollbackSupported() {
  95         return containsNonModuleCapability(NetconfMessageTransformUtil.NETCONF_ROLLBACK_ON_ERROR_URI.toString());
  96     }
  97
  98     public boolean isCandidateSupported() {
  99         return containsNonModuleCapability(NetconfMessageTransformUtil.NETCONF_CANDIDATE_URI.toString());
 100     }
 101
 102     public boolean isMonitoringSupported() {
 103         return containsModuleCapability(NetconfMessageTransformUtil.IETF_NETCONF_MONITORING)
 104                 || containsNonModuleCapability(NetconfMessageTransformUtil.IETF_NETCONF_MONITORING.getNamespace().toString());
 105     }
 106
 107     public NetconfSessionCapabilities replaceModuleCaps(final NetconfSessionCapabilities netconfSessionModuleCapabilities) {
 108         final Set<QName> moduleBasedCaps = Sets.newHashSet(netconfSessionModuleCapabilities.getModuleBasedCaps());
 109
 110         // Preserve monitoring module, since it indicates support for ietf-netconf-monitoring
 111         if(containsModuleCapability(NetconfMessageTransformUtil.IETF_NETCONF_MONITORING)) {
 112             moduleBasedCaps.add(NetconfMessageTransformUtil.IETF_NETCONF_MONITORING);
 113         }
 114         return new NetconfSessionCapabilities(getNonModuleCaps(), moduleBasedCaps);
 115     }
 116
 117     public static NetconfSessionCapabilities fromNetconfSession(final NetconfClientSession session) {
 118         return fromStrings(session.getServerCapabilities());
 119     }
 120
 121     private static QName cachedQName(final String namespace, final String revision, final String moduleName) {
 122         return QName.cachedReference(QName.create(namespace, revision, moduleName));
 123     }
 124
 125     private static QName cachedQName(final String namespace, final String moduleName) {
 126         return QName.cachedReference(QName.create(URI.create(namespace), null, moduleName).withoutRevision());
 127     }
 128
 129     public static NetconfSessionCapabilities fromStrings(final Collection<String> capabilities) {
 130         final Set<QName> moduleBasedCaps = new HashSet<>();
 131         final Set<String> nonModuleCaps = Sets.newHashSet(capabilities);
 132
 133         for (final String capability : capabilities) {
 134             final int qmark = capability.indexOf('?');
 135             if (qmark == -1) {
 136                 continue;
 137             }
 138
 139             final String namespace = capability.substring(0, qmark);
 140             final Iterable<String> queryParams = AMP_SPLITTER.split(capability.substring(qmark + 1));
 141             final String moduleName = MODULE_PARAM.from(queryParams);
 142             if (moduleName == null) {
 143                 continue;
 144             }
 145
 146             String revision = REVISION_PARAM.from(queryParams);
 147             if (revision != null) {
 148                 addModuleQName(moduleBasedCaps, nonModuleCaps, capability, cachedQName(namespace, revision, moduleName));
 149                 continue;
 150             }
 151
 152             /*
 153              * We have seen devices which mis-escape revision, but the revision may not
 154              * even be there. First check if there is a substring that matches revision.
 155              */
 156             if (Iterables.any(queryParams, CONTAINS_REVISION)) {
 157
 158                 LOG.debug("Netconf device was not reporting revision correctly, trying to get amp;revision=");
 159                 revision = BROKEN_REVISON_PARAM.from(queryParams);
 160                 if (revision == null) {
 161                     LOG.warn("Netconf device returned revision incorrectly escaped for {}, ignoring it", capability);
 162                     addModuleQName(moduleBasedCaps, nonModuleCaps, capability, cachedQName(namespace, moduleName));
 163                 } else {
 164                     addModuleQName(moduleBasedCaps, nonModuleCaps, capability, cachedQName(namespace, revision, moduleName));
 165                 }
 166                 continue;
 167             }
 168
 169             // Fallback, no revision provided for module
 170             addModuleQName(moduleBasedCaps, nonModuleCaps, capability, cachedQName(namespace, moduleName));
 171         }
 172
 173         return new NetconfSessionCapabilities(ImmutableSet.copyOf(nonModuleCaps), ImmutableSet.copyOf(moduleBasedCaps));
 174     }
 175
 176
 177     private static void addModuleQName(final Set<QName> moduleBasedCaps, final Set<String> nonModuleCaps, final String capability, final QName qName) {
 178         moduleBasedCaps.add(qName);
 179         nonModuleCaps.remove(capability);
 180     }
 181 }