opendaylight/networkconfiguration/neutron/northbound/src/main/java/org/opendaylight/controller/networkconfig/neutron/northbound/NeutronPortsNorthbound.java

   1 /*
   2  * Copyright IBM Corporation, 2013.  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.controller.networkconfig.neutron.northbound;
  10
  11 import java.util.ArrayList;
  12 import java.util.HashMap;
  13 import java.util.Iterator;
  14 import java.util.List;
  15
  16 import javax.ws.rs.Consumes;
  17 import javax.ws.rs.DELETE;
  18 import javax.ws.rs.DefaultValue;
  19 import javax.ws.rs.GET;
  20 import javax.ws.rs.POST;
  21 import javax.ws.rs.PUT;
  22 import javax.ws.rs.Path;
  23 import javax.ws.rs.PathParam;
  24 import javax.ws.rs.Produces;
  25 import javax.ws.rs.QueryParam;
  26 import javax.ws.rs.core.Context;
  27 import javax.ws.rs.core.MediaType;
  28 import javax.ws.rs.core.Response;
  29 import javax.ws.rs.core.UriInfo;
  30
  31 import org.codehaus.enunciate.jaxrs.ResponseCode;
  32 import org.codehaus.enunciate.jaxrs.StatusCodes;
  33 import org.opendaylight.controller.networkconfig.neutron.INeutronNetworkCRUD;
  34 import org.opendaylight.controller.networkconfig.neutron.INeutronPortAware;
  35 import org.opendaylight.controller.networkconfig.neutron.INeutronPortCRUD;
  36 import org.opendaylight.controller.networkconfig.neutron.INeutronSubnetCRUD;
  37 import org.opendaylight.controller.networkconfig.neutron.NeutronCRUDInterfaces;
  38 import org.opendaylight.controller.networkconfig.neutron.NeutronPort;
  39 import org.opendaylight.controller.networkconfig.neutron.NeutronSubnet;
  40 import org.opendaylight.controller.networkconfig.neutron.Neutron_IPs;
  41
  42 /**
  43  * Neutron Northbound REST APIs.<br>
  44  * This class provides REST APIs for managing neutron port objects
  45  *
  46  * <br>
  47  * <br>
  48  * Authentication scheme : <b>HTTP Basic</b><br>
  49  * Authentication realm : <b>opendaylight</b><br>
  50  * Transport : <b>HTTP and HTTPS</b><br>
  51  * <br>
  52  * HTTPS Authentication is disabled by default. Administrator can enable it in
  53  * tomcat-server.xml after adding a proper keystore / SSL certificate from a
  54  * trusted authority.<br>
  55  * More info :
  56  * http://tomcat.apache.org/tomcat-7.0-doc/ssl-howto.html#Configuration
  57  *
  58  */
  59
  60 @Path("/ports")
  61 public class NeutronPortsNorthbound {
  62
  63     final String mac_regex="^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$";
  64
  65     private NeutronPort extractFields(NeutronPort o, List<String> fields) {
  66         return o.extractFields(fields);
  67     }
  68
  69     @Context
  70     UriInfo uriInfo;
  71
  72     /**
  73      * Returns a list of all Ports */
  74
  75     @GET
  76     @Produces({ MediaType.APPLICATION_JSON })
  77     //@TypeHint(OpenStackPorts.class)
  78     @StatusCodes({
  79         @ResponseCode(code = 200, condition = "Operation successful"),
  80         @ResponseCode(code = 401, condition = "Unauthorized"),
  81         @ResponseCode(code = 501, condition = "Not Implemented") })
  82     public Response listPorts(
  83             // return fields
  84             @QueryParam("fields") List<String> fields,
  85             // note: openstack isn't clear about filtering on lists, so we aren't handling them
  86             @QueryParam("id") String queryID,
  87             @QueryParam("network_id") String queryNetworkID,
  88             @QueryParam("name") String queryName,
  89             @QueryParam("admin_state_up") String queryAdminStateUp,
  90             @QueryParam("status") String queryStatus,
  91             @QueryParam("mac_address") String queryMACAddress,
  92             @QueryParam("device_id") String queryDeviceID,
  93             @QueryParam("device_owner") String queryDeviceOwner,
  94             @QueryParam("tenant_id") String queryTenantID,
  95             // linkTitle
  96             @QueryParam("limit") Integer limit,
  97             @QueryParam("marker") String marker,
  98             @DefaultValue("false") @QueryParam("page_reverse") Boolean pageReverse
  99             // sorting not supported
 100             ) {
 101         INeutronPortCRUD portInterface = NeutronCRUDInterfaces.getINeutronPortCRUD(this);
 102         if (portInterface == null) {
 103             throw new ServiceUnavailableException("Port CRUD Interface "
 104                     + RestMessages.SERVICEUNAVAILABLE.toString());
 105         }
 106         List<NeutronPort> allPorts = portInterface.getAllPorts();
 107         List<NeutronPort> ans = new ArrayList<NeutronPort>();
 108         Iterator<NeutronPort> i = allPorts.iterator();
 109         while (i.hasNext()) {
 110             NeutronPort oSS = i.next();
 111             if ((queryID == null || queryID.equals(oSS.getID())) &&
 112                     (queryNetworkID == null || queryNetworkID.equals(oSS.getNetworkUUID())) &&
 113                     (queryName == null || queryName.equals(oSS.getName())) &&
 114                     (queryAdminStateUp == null || queryAdminStateUp.equals(oSS.getAdminStateUp())) &&
 115                     (queryStatus == null || queryStatus.equals(oSS.getStatus())) &&
 116                     (queryMACAddress == null || queryMACAddress.equals(oSS.getMacAddress())) &&
 117                     (queryDeviceID == null || queryDeviceID.equals(oSS.getDeviceID())) &&
 118                     (queryDeviceOwner == null || queryDeviceOwner.equals(oSS.getDeviceOwner())) &&
 119                     (queryTenantID == null || queryTenantID.equals(oSS.getTenantID()))) {
 120                 if (fields.size() > 0) {
 121                     ans.add(extractFields(oSS,fields));
 122                 } else {
 123                     ans.add(oSS);
 124                 }
 125             }
 126         }
 127
 128         if (limit != null && ans.size() > 1) {
 129             // Return a paginated request
 130             NeutronPortRequest request = (NeutronPortRequest) PaginatedRequestFactory.createRequest(limit,
 131                     marker, pageReverse, uriInfo, ans, NeutronPort.class);
 132             return Response.status(200).entity(request).build();
 133         }
 134
 135         return Response.status(200).entity(
 136                 new NeutronPortRequest(ans)).build();
 137     }
 138
 139     /**
 140      * Returns a specific Port */
 141
 142     @Path("{portUUID}")
 143     @GET
 144     @Produces({ MediaType.APPLICATION_JSON })
 145     //@TypeHint(OpenStackPorts.class)
 146     @StatusCodes({
 147         @ResponseCode(code = 200, condition = "Operation successful"),
 148         @ResponseCode(code = 401, condition = "Unauthorized"),
 149         @ResponseCode(code = 404, condition = "Not Found"),
 150         @ResponseCode(code = 501, condition = "Not Implemented") })
 151     public Response showPort(
 152             @PathParam("portUUID") String portUUID,
 153             // return fields
 154             @QueryParam("fields") List<String> fields ) {
 155         INeutronPortCRUD portInterface = NeutronCRUDInterfaces.getINeutronPortCRUD(this);
 156         if (portInterface == null) {
 157             throw new ServiceUnavailableException("Port CRUD Interface "
 158                     + RestMessages.SERVICEUNAVAILABLE.toString());
 159         }
 160         if (!portInterface.portExists(portUUID)) {
 161             throw new ResourceNotFoundException("port UUID does not exist.");
 162         }
 163         if (fields.size() > 0) {
 164             NeutronPort ans = portInterface.getPort(portUUID);
 165             return Response.status(200).entity(
 166                     new NeutronPortRequest(extractFields(ans, fields))).build();
 167         } else {
 168             return Response.status(200).entity(
 169                     new NeutronPortRequest(portInterface.getPort(portUUID))).build();
 170         }
 171     }
 172
 173     /**
 174      * Creates new Ports */
 175
 176     @POST
 177     @Produces({ MediaType.APPLICATION_JSON })
 178     @Consumes({ MediaType.APPLICATION_JSON })
 179     //@TypeHint(OpenStackPorts.class)
 180     @StatusCodes({
 181         @ResponseCode(code = 201, condition = "Created"),
 182         @ResponseCode(code = 400, condition = "Bad Request"),
 183         @ResponseCode(code = 401, condition = "Unauthorized"),
 184         @ResponseCode(code = 403, condition = "Forbidden"),
 185         @ResponseCode(code = 404, condition = "Not Found"),
 186         @ResponseCode(code = 409, condition = "Conflict"),
 187         @ResponseCode(code = 501, condition = "Not Implemented"),
 188         @ResponseCode(code = 503, condition = "MAC generation failure") })
 189     public Response createPorts(final NeutronPortRequest input) {
 190         INeutronPortCRUD portInterface = NeutronCRUDInterfaces.getINeutronPortCRUD(this);
 191         if (portInterface == null) {
 192             throw new ServiceUnavailableException("Port CRUD Interface "
 193                     + RestMessages.SERVICEUNAVAILABLE.toString());
 194         }
 195         INeutronNetworkCRUD networkInterface = NeutronCRUDInterfaces.getINeutronNetworkCRUD( this);
 196         if (networkInterface == null) {
 197             throw new ServiceUnavailableException("Network CRUD Interface "
 198                     + RestMessages.SERVICEUNAVAILABLE.toString());
 199         }
 200         INeutronSubnetCRUD subnetInterface = NeutronCRUDInterfaces.getINeutronSubnetCRUD( this);
 201         if (subnetInterface == null) {
 202             throw new ServiceUnavailableException("Subnet CRUD Interface "
 203                     + RestMessages.SERVICEUNAVAILABLE.toString());
 204         }
 205         if (input.isSingleton()) {
 206             NeutronPort singleton = input.getSingleton();
 207
 208             /*
 209              * the port must be part of an existing network, must not already exist,
 210              * have a valid MAC and the MAC not be in use
 211              */
 212             if (singleton.getNetworkUUID() == null) {
 213                 throw new BadRequestException("network UUID musy be specified");
 214             }
 215             if (portInterface.portExists(singleton.getID())) {
 216                 throw new BadRequestException("port UUID already exists");
 217             }
 218             if (!networkInterface.networkExists(singleton.getNetworkUUID())) {
 219                 throw new ResourceNotFoundException("network UUID does not exist.");
 220             }
 221             if (singleton.getMacAddress() == null ||
 222                     !singleton.getMacAddress().matches(mac_regex)) {
 223                 throw new BadRequestException("MAC address not properly formatted");
 224             }
 225             if (portInterface.macInUse(singleton.getMacAddress())) {
 226                 throw new ResourceConflictException("MAC Address is in use.");
 227             }
 228             /*
 229              * if fixed IPs are specified, each one has to have an existing subnet ID
 230              * that is in the same scoping network as the port.  In addition, if an IP
 231              * address is specified it has to be a valid address for the subnet and not
 232              * already in use
 233              */
 234             List<Neutron_IPs> fixedIPs = singleton.getFixedIPs();
 235             if (fixedIPs != null && fixedIPs.size() > 0) {
 236                 Iterator<Neutron_IPs> fixedIPIterator = fixedIPs.iterator();
 237                 while (fixedIPIterator.hasNext()) {
 238                     Neutron_IPs ip = fixedIPIterator.next();
 239                     if (ip.getSubnetUUID() == null) {
 240                         throw new BadRequestException("subnet UUID not specified");
 241                     }
 242                     if (!subnetInterface.subnetExists(ip.getSubnetUUID())) {
 243                         throw new BadRequestException("subnet UUID must exists");
 244                     }
 245                     NeutronSubnet subnet = subnetInterface.getSubnet(ip.getSubnetUUID());
 246                     if (!singleton.getNetworkUUID().equalsIgnoreCase(subnet.getNetworkUUID())) {
 247                         throw new BadRequestException("network UUID must match that of subnet");
 248                     }
 249                     if (ip.getIpAddress() != null) {
 250                         if (!subnet.isValidIP(ip.getIpAddress())) {
 251                             throw new BadRequestException("IP address is not valid");
 252                         }
 253                         if (subnet.isIPInUse(ip.getIpAddress())) {
 254                             throw new ResourceConflictException("IP address is in use.");
 255                         }
 256                     }
 257                 }
 258             }
 259
 260             Object[] instances = NeutronUtil.getInstances(INeutronPortAware.class, this);
 261             if (instances != null) {
 262                 if (instances.length > 0) {
 263                     for (Object instance : instances) {
 264                         INeutronPortAware service = (INeutronPortAware) instance;
 265                         int status = service.canCreatePort(singleton);
 266                         if (status < 200 || status > 299) {
 267                             return Response.status(status).build();
 268                         }
 269                     }
 270                 } else {
 271                     throw new ServiceUnavailableException("No providers registered.  Please try again later");
 272                 }
 273             } else {
 274                 throw new ServiceUnavailableException("Couldn't get providers list.  Please try again later");
 275             }
 276
 277             // add the port to the cache
 278             portInterface.addPort(singleton);
 279             if (instances != null) {
 280                 for (Object instance : instances) {
 281                     INeutronPortAware service = (INeutronPortAware) instance;
 282                     service.neutronPortCreated(singleton);
 283                 }
 284             }
 285         } else {
 286             List<NeutronPort> bulk = input.getBulk();
 287             Iterator<NeutronPort> i = bulk.iterator();
 288             HashMap<String, NeutronPort> testMap = new HashMap<String, NeutronPort>();
 289             Object[] instances = NeutronUtil.getInstances(INeutronPortAware.class, this);
 290             while (i.hasNext()) {
 291                 NeutronPort test = i.next();
 292
 293                 /*
 294                  * the port must be part of an existing network, must not already exist,
 295                  * have a valid MAC and the MAC not be in use.  Further the bulk request
 296                  * can't already contain a new port with the same UUID
 297                  */
 298                 if (portInterface.portExists(test.getID())) {
 299                     throw new BadRequestException("port UUID already exists");
 300                 }
 301                 if (testMap.containsKey(test.getID())) {
 302                     throw new BadRequestException("port UUID already exists");
 303                 }
 304                 for (NeutronPort check : testMap.values()) {
 305                     if (test.getMacAddress().equalsIgnoreCase(check.getMacAddress())) {
 306                         throw new ResourceConflictException("MAC address already allocated");
 307                     }
 308                     for (Neutron_IPs test_fixedIP : test.getFixedIPs()) {
 309                         for (Neutron_IPs check_fixedIP : check.getFixedIPs()) {
 310                             if (test_fixedIP.getIpAddress().equals(check_fixedIP.getIpAddress())) {
 311                                 throw new ResourceConflictException("IP address already allocated");
 312                             }
 313                         }
 314                     }
 315                 }
 316                 testMap.put(test.getID(), test);
 317                 if (!networkInterface.networkExists(test.getNetworkUUID())) {
 318                     throw new ResourceNotFoundException("network UUID does not exist.");
 319                 }
 320                 if (!test.getMacAddress().matches(mac_regex)) {
 321                     throw new BadRequestException("MAC address not properly formatted");
 322                 }
 323                 if (portInterface.macInUse(test.getMacAddress())) {
 324                     throw new ResourceConflictException("MAC address in use");
 325                 }
 326
 327                 /*
 328                  * if fixed IPs are specified, each one has to have an existing subnet ID
 329                  * that is in the same scoping network as the port.  In addition, if an IP
 330                  * address is specified it has to be a valid address for the subnet and not
 331                  * already in use (or be the gateway IP address of the subnet)
 332                  */
 333                 List<Neutron_IPs> fixedIPs = test.getFixedIPs();
 334                 if (fixedIPs != null && fixedIPs.size() > 0) {
 335                     Iterator<Neutron_IPs> fixedIPIterator = fixedIPs.iterator();
 336                     while (fixedIPIterator.hasNext()) {
 337                         Neutron_IPs ip = fixedIPIterator.next();
 338                         if (ip.getSubnetUUID() == null) {
 339                             throw new BadRequestException("subnet UUID must be specified");
 340                         }
 341                         if (!subnetInterface.subnetExists(ip.getSubnetUUID())) {
 342                             throw new BadRequestException("subnet UUID doesn't exists");
 343                         }
 344                         NeutronSubnet subnet = subnetInterface.getSubnet(ip.getSubnetUUID());
 345                         if (!test.getNetworkUUID().equalsIgnoreCase(subnet.getNetworkUUID())) {
 346                             throw new BadRequestException("network UUID must match that of subnet");
 347                         }
 348                         if (ip.getIpAddress() != null) {
 349                             if (!subnet.isValidIP(ip.getIpAddress())) {
 350                                 throw new BadRequestException("ip address not valid");
 351                             }
 352                             //TODO: need to add consideration for a fixed IP being assigned the same address as a allocated IP in the
 353                             //same bulk create
 354                             if (subnet.isIPInUse(ip.getIpAddress())) {
 355                                 throw new ResourceConflictException("IP address in use");
 356                             }
 357                         }
 358                     }
 359                 }
 360                 if (instances != null) {
 361                     if (instances.length > 0) {
 362                         for (Object instance : instances) {
 363                             INeutronPortAware service = (INeutronPortAware) instance;
 364                             int status = service.canCreatePort(test);
 365                             if (status < 200 || status > 299) {
 366                                 return Response.status(status).build();
 367                             }
 368                         }
 369                     } else {
 370                         throw new ServiceUnavailableException("No providers registered.  Please try again later");
 371                     }
 372                 } else {
 373                     throw new ServiceUnavailableException("Couldn't get providers list.  Please try again later");
 374                 }
 375             }
 376
 377             //once everything has passed, then we can add to the cache
 378             i = bulk.iterator();
 379             while (i.hasNext()) {
 380                 NeutronPort test = i.next();
 381                 portInterface.addPort(test);
 382                 if (instances != null) {
 383                     for (Object instance : instances) {
 384                         INeutronPortAware service = (INeutronPortAware) instance;
 385                         service.neutronPortCreated(test);
 386                     }
 387                 }
 388             }
 389         }
 390         return Response.status(201).entity(input).build();
 391     }
 392
 393     /**
 394      * Updates a Port */
 395
 396     @Path("{portUUID}")
 397     @PUT
 398     @Produces({ MediaType.APPLICATION_JSON })
 399     @Consumes({ MediaType.APPLICATION_JSON })
 400     //@TypeHint(OpenStackPorts.class)
 401     @StatusCodes({
 402         @ResponseCode(code = 200, condition = "Operation successful"),
 403         @ResponseCode(code = 400, condition = "Bad Request"),
 404         @ResponseCode(code = 401, condition = "Unauthorized"),
 405         @ResponseCode(code = 403, condition = "Forbidden"),
 406         @ResponseCode(code = 404, condition = "Not Found"),
 407         @ResponseCode(code = 409, condition = "Conflict"),
 408         @ResponseCode(code = 501, condition = "Not Implemented") })
 409     public Response updatePort(
 410             @PathParam("portUUID") String portUUID,
 411             NeutronPortRequest input
 412             ) {
 413         INeutronPortCRUD portInterface = NeutronCRUDInterfaces.getINeutronPortCRUD(this);
 414         if (portInterface == null) {
 415             throw new ServiceUnavailableException("Port CRUD Interface "
 416                     + RestMessages.SERVICEUNAVAILABLE.toString());
 417         }
 418         INeutronSubnetCRUD subnetInterface = NeutronCRUDInterfaces.getINeutronSubnetCRUD( this);
 419         if (subnetInterface == null) {
 420             throw new ServiceUnavailableException("Subnet CRUD Interface "
 421                     + RestMessages.SERVICEUNAVAILABLE.toString());
 422         }
 423
 424         // port has to exist and only a single delta is supported
 425         if (!portInterface.portExists(portUUID)) {
 426             throw new ResourceNotFoundException("port UUID does not exist.");
 427         }
 428         NeutronPort target = portInterface.getPort(portUUID);
 429         if (!input.isSingleton()) {
 430             throw new BadRequestException("only singleton edit suported");
 431         }
 432         NeutronPort singleton = input.getSingleton();
 433         NeutronPort original = portInterface.getPort(portUUID);
 434
 435         // deltas restricted by Neutron
 436         if (singleton.getID() != null || singleton.getTenantID() != null ||
 437                 singleton.getStatus() != null) {
 438             throw new BadRequestException("attribute change blocked by Neutron");
 439         }
 440
 441         Object[] instances = NeutronUtil.getInstances(INeutronPortAware.class, this);
 442         if (instances != null) {
 443             if (instances.length > 0) {
 444                 for (Object instance : instances) {
 445                     INeutronPortAware service = (INeutronPortAware) instance;
 446                     int status = service.canUpdatePort(singleton, original);
 447                     if (status < 200 || status > 299) {
 448                         return Response.status(status).build();
 449                     }
 450                 }
 451             } else {
 452                 throw new ServiceUnavailableException("No providers registered.  Please try again later");
 453             }
 454         } else {
 455             throw new ServiceUnavailableException("Couldn't get providers list.  Please try again later");
 456         }
 457
 458         // Verify the new fixed ips are valid
 459         List<Neutron_IPs> fixedIPs = singleton.getFixedIPs();
 460         if (fixedIPs != null && fixedIPs.size() > 0) {
 461             Iterator<Neutron_IPs> fixedIPIterator = fixedIPs.iterator();
 462             while (fixedIPIterator.hasNext()) {
 463                 Neutron_IPs ip = fixedIPIterator.next();
 464                 if (ip.getSubnetUUID() == null) {
 465                     throw new BadRequestException("subnet UUID must be specified");
 466                 }
 467                 if (!subnetInterface.subnetExists(ip.getSubnetUUID())) {
 468                     throw new BadRequestException("subnet UUID doesn't exist.");
 469                 }
 470                 NeutronSubnet subnet = subnetInterface.getSubnet(ip.getSubnetUUID());
 471                 if (!target.getNetworkUUID().equalsIgnoreCase(subnet.getNetworkUUID())) {
 472                     throw new BadRequestException("network UUID must match that of subnet");
 473                 }
 474                 if (ip.getIpAddress() != null) {
 475                     if (!subnet.isValidIP(ip.getIpAddress())) {
 476                         throw new BadRequestException("invalid IP address");
 477                     }
 478                     if (subnet.isIPInUse(ip.getIpAddress())) {
 479                         throw new ResourceConflictException("IP address in use");
 480                     }
 481                 }
 482             }
 483         }
 484
 485         //        TODO: Support change of security groups
 486         // update the port and return the modified object
 487         portInterface.updatePort(portUUID, singleton);
 488         NeutronPort updatedPort = portInterface.getPort(portUUID);
 489         if (instances != null) {
 490             for (Object instance : instances) {
 491                 INeutronPortAware service = (INeutronPortAware) instance;
 492                 service.neutronPortUpdated(updatedPort);
 493             }
 494         }
 495         return Response.status(200).entity(
 496                 new NeutronPortRequest(updatedPort)).build();
 497
 498     }
 499
 500     /**
 501      * Deletes a Port */
 502
 503     @Path("{portUUID}")
 504     @DELETE
 505     @StatusCodes({
 506         @ResponseCode(code = 204, condition = "No Content"),
 507         @ResponseCode(code = 401, condition = "Unauthorized"),
 508         @ResponseCode(code = 403, condition = "Forbidden"),
 509         @ResponseCode(code = 404, condition = "Not Found"),
 510         @ResponseCode(code = 501, condition = "Not Implemented") })
 511     public Response deletePort(
 512             @PathParam("portUUID") String portUUID) {
 513         INeutronPortCRUD portInterface = NeutronCRUDInterfaces.getINeutronPortCRUD(this);
 514         if (portInterface == null) {
 515             throw new ServiceUnavailableException("Port CRUD Interface "
 516                     + RestMessages.SERVICEUNAVAILABLE.toString());
 517         }
 518
 519         // port has to exist and not be owned by anyone.  then it can be removed from the cache
 520         if (!portInterface.portExists(portUUID)) {
 521             throw new ResourceNotFoundException("port UUID does not exist.");
 522         }
 523         NeutronPort port = portInterface.getPort(portUUID);
 524         if (port.getDeviceID() != null ||
 525                 port.getDeviceOwner() != null) {
 526             Response.status(403).build();
 527         }
 528         NeutronPort singleton = portInterface.getPort(portUUID);
 529         Object[] instances = NeutronUtil.getInstances(INeutronPortAware.class, this);
 530         if (instances != null) {
 531             if (instances.length > 0) {
 532                 for (Object instance : instances) {
 533                     INeutronPortAware service = (INeutronPortAware) instance;
 534                     int status = service.canDeletePort(singleton);
 535                     if (status < 200 || status > 299) {
 536                         return Response.status(status).build();
 537                     }
 538                 }
 539             } else {
 540                 throw new ServiceUnavailableException("No providers registered.  Please try again later");
 541             }
 542         } else {
 543             throw new ServiceUnavailableException("Couldn't get providers list.  Please try again later");
 544         }
 545         portInterface.removePort(portUUID);
 546         if (instances != null) {
 547             for (Object instance : instances) {
 548                 INeutronPortAware service = (INeutronPortAware) instance;
 549                 service.neutronPortDeleted(singleton);
 550             }
 551         }
 552         return Response.status(204).build();
 553     }
 554 }