restconf/sal-rest-connector/src/main/java/org/opendaylight/restconf/restful/services/impl/RestconfStreamsSubscriptionServiceImpl.java

   1 /*
   2  * Copyright (c) 2016 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.restconf.restful.services.impl;
   9
  10 import com.google.common.base.Strings;
  11 import java.net.URI;
  12 import java.util.Map;
  13 import javax.ws.rs.core.Response;
  14 import javax.ws.rs.core.Response.Status;
  15 import javax.ws.rs.core.UriBuilder;
  16 import javax.ws.rs.core.UriInfo;
  17 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataBroker.DataChangeScope;
  18 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  19 import org.opendaylight.netconf.sal.restconf.impl.RestconfDocumentedException;
  20 import org.opendaylight.netconf.sal.restconf.impl.RestconfError.ErrorTag;
  21 import org.opendaylight.netconf.sal.restconf.impl.RestconfError.ErrorType;
  22 import org.opendaylight.netconf.sal.streams.listeners.ListenerAdapter;
  23 import org.opendaylight.netconf.sal.streams.listeners.Notificator;
  24 import org.opendaylight.restconf.handlers.DOMDataBrokerHandler;
  25 import org.opendaylight.restconf.restful.services.api.RestconfStreamsSubscriptionService;
  26 import org.opendaylight.restconf.restful.utils.RestconfStreamsConstants;
  27 import org.opendaylight.restconf.restful.utils.SubscribeToStreamUtil;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 /**
  32  * Implementation of {@link RestconfStreamsSubscriptionService}
  33  *
  34  */
  35 public class RestconfStreamsSubscriptionServiceImpl implements RestconfStreamsSubscriptionService {
  36
  37     private static final Logger LOG = LoggerFactory.getLogger(RestconfStreamsSubscriptionServiceImpl.class);
  38
  39     private final DOMDataBrokerHandler domDataBrokerHandler;
  40
  41     public RestconfStreamsSubscriptionServiceImpl(final DOMDataBrokerHandler domDataBrokerHandler) {
  42         this.domDataBrokerHandler = domDataBrokerHandler;
  43     }
  44
  45     @Override
  46     public Response subscribeToStream(final String identifier, final UriInfo uriInfo) {
  47         final Map<String, String> mapOfValues = SubscribeToStreamUtil.mapValuesFromUri(identifier);
  48
  49         final LogicalDatastoreType ds = SubscribeToStreamUtil.parseURIEnum(LogicalDatastoreType.class,
  50                 mapOfValues.get(RestconfStreamsConstants.DATASTORE_PARAM_NAME));
  51         if (ds == null) {
  52             final String msg = "Stream name doesn't contains datastore value (pattern /datastore=)";
  53             LOG.debug(msg);
  54             throw new RestconfDocumentedException(msg, ErrorType.APPLICATION, ErrorTag.MISSING_ATTRIBUTE);
  55         }
  56
  57         final DataChangeScope scope = SubscribeToStreamUtil.parseURIEnum(DataChangeScope.class,
  58                 mapOfValues.get(RestconfStreamsConstants.SCOPE_PARAM_NAME));
  59         if (scope == null) {
  60             final String msg = "Stream name doesn't contains datastore value (pattern /scope=)";
  61             LOG.warn(msg);
  62             throw new RestconfDocumentedException(msg, ErrorType.APPLICATION, ErrorTag.MISSING_ATTRIBUTE);
  63         }
  64
  65         final String streamName = Notificator.createStreamNameFromUri(identifier);
  66         if (Strings.isNullOrEmpty(streamName)) {
  67             final String msg = "Stream name is empty.";
  68             LOG.warn(msg);
  69             throw new RestconfDocumentedException(msg, ErrorType.PROTOCOL, ErrorTag.INVALID_VALUE);
  70         }
  71
  72         final ListenerAdapter listener = Notificator.getListenerFor(streamName);
  73         SubscribeToStreamUtil.registration(ds, scope, listener, this.domDataBrokerHandler.get());
  74
  75         final int port = SubscribeToStreamUtil.prepareNotificationPort();
  76
  77         final UriBuilder uriBuilder = uriInfo.getAbsolutePathBuilder();
  78         final UriBuilder uriToWebSocketServer = uriBuilder.port(port).scheme(RestconfStreamsConstants.SCHEMA_SUBSCIBRE_URI);
  79         final URI uri = uriToWebSocketServer.replacePath(streamName).build();
  80
  81         return Response.status(Status.OK).location(uri).build();
  82     }
  83 }