pce/src/main/java/org/opendaylight/transportpce/pce/PceSendingPceRPCs.java

   1 /*
   2  * Copyright © 2017 AT&T 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.transportpce.pce;
  10
  11 import org.opendaylight.transportpce.common.ResponseCodes;
  12 import org.opendaylight.transportpce.common.network.NetworkTransactionService;
  13 import org.opendaylight.transportpce.pce.constraints.PceConstraints;
  14 import org.opendaylight.transportpce.pce.constraints.PceConstraintsCalc;
  15 import org.opendaylight.transportpce.pce.gnpy.ConnectToGnpyServer;
  16 import org.opendaylight.transportpce.pce.gnpy.GnpyException;
  17 import org.opendaylight.transportpce.pce.gnpy.GnpyResult;
  18 import org.opendaylight.transportpce.pce.gnpy.GnpyUtilitiesImpl;
  19 import org.opendaylight.transportpce.pce.graph.PceGraph;
  20 import org.opendaylight.transportpce.pce.networkanalyzer.PceCalculation;
  21 import org.opendaylight.transportpce.pce.networkanalyzer.PceResult;
  22 import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.pce.rev190624.PathComputationRequestInput;
  23 import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.pce.rev190624.PathComputationRequestInputBuilder;
  24 import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.pce.rev190624.service.path.rpc.result.PathDescriptionBuilder;
  25 import org.opendaylight.yang.gen.v1.http.org.transportpce.b.c._interface.pathdescription.rev171017.path.description.AToZDirection;
  26 import org.opendaylight.yang.gen.v1.http.org.transportpce.b.c._interface.pathdescription.rev171017.path.description.ZToADirection;
  27 import org.opendaylight.yang.gen.v1.http.org.transportpce.b.c._interface.routing.constraints.rev171017.RoutingConstraintsSp.PceMetric;
  28 import org.opendaylight.yang.gen.v1.http.org.transportpce.b.c._interface.routing.constraints.rev171017.routing.constraints.sp.HardConstraints;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 /*
  33  * Class for Sending
  34  * PCE requests :
  35  * - path-computation-request
  36  * - cancel-resource-reserve.
  37  * @author Martial Coulibaly ( martial.coulibaly@gfi.com ) on behalf of Orange
  38  *
  39  */
  40 public class PceSendingPceRPCs {
  41
  42     /* Logging. */
  43     private static final Logger LOG = LoggerFactory.getLogger(PceSendingPceRPCs.class);
  44     /* define procedure success (or not ). */
  45     private PceResult rc = new PceResult();
  46
  47     /*
  48      * define type of request<br> <code>true</code> pathcomputation <br>
  49      * <code>false</code> cancelresourcereserve .
  50      */
  51     private PathDescriptionBuilder pathDescription;
  52     private PathComputationRequestInput input;
  53     private NetworkTransactionService networkTransaction;
  54     private PceConstraints pceHardConstraints = new PceConstraints();
  55     private PceConstraints pceSoftConstraints = new PceConstraints();
  56     private GnpyResult gnpyAtoZ;
  57     private GnpyResult gnpyZtoA;
  58     private Boolean success;
  59     private String message;
  60     private String responseCode;
  61
  62     public PceSendingPceRPCs() {
  63         setPathDescription(null);
  64         this.input = null;
  65         this.networkTransaction = null;
  66     }
  67
  68     public PceSendingPceRPCs(PathComputationRequestInput input,
  69         NetworkTransactionService networkTransaction) {
  70         setPathDescription(null);
  71
  72         // TODO compliance check to check that input is not empty
  73         this.input = input;
  74         this.networkTransaction = networkTransaction;
  75     }
  76
  77     public void cancelResourceReserve() {
  78         success = false;
  79         LOG.info("Wait for 10s til beginning the PCE cancelResourceReserve request");
  80         try {
  81             // sleep for 10s
  82             Thread.sleep(10000);
  83         } catch (InterruptedException e) {
  84             LOG.error(e.toString());
  85         }
  86         success = true;
  87         LOG.info("cancelResourceReserve ...");
  88     }
  89
  90     public void pathComputationWithConstraints(PceConstraints hardConstraints, PceConstraints softConstraints) {
  91
  92         PceCalculation nwAnalizer =
  93             new PceCalculation(input, networkTransaction, hardConstraints, softConstraints, rc);
  94         nwAnalizer.retrievePceNetwork();
  95         rc = nwAnalizer.getReturnStructure();
  96         if (!rc.getStatus()) {
  97             LOG.error("In pathComputationWithConstraints, nwAnalizer: result = {}", rc.toString());
  98             return;
  99         }
 100         LOG.info("PceGraph ...");
 101         PceGraph graph = new PceGraph(nwAnalizer.getaendPceNode(),
 102             nwAnalizer.getzendPceNode(), nwAnalizer.getAllPceNodes(),
 103             hardConstraints, softConstraints, rc);
 104         graph.calcPath();
 105         rc = graph.getReturnStructure();
 106         if (!rc.getStatus()) {
 107             LOG.warn("In pathComputationWithConstraints : Graph return without Path ");
 108             // TODO fix. This is quick workaround for algorithm problem
 109             if ((rc.getLocalCause() == PceResult.LocalCause.TOO_HIGH_LATENCY)
 110                 && (hardConstraints.getPceMetrics() == PceMetric.HopCount)
 111                 && (hardConstraints.getMaxLatency() != -1)) {
 112                 hardConstraints.setPceMetrics(PceMetric.PropagationDelay);
 113                 graph = patchRerunGraph(graph);
 114             }
 115
 116             if (rc.getLocalCause() == PceResult.LocalCause.HD_NODE_INCLUDE) {
 117                 graph.setKpathsToBring(graph.getKpathsToBring() * 10);
 118                 graph = patchRerunGraph(graph);
 119             }
 120
 121             if (!rc.getStatus()) {
 122                 LOG.error("In pathComputationWithConstraints, graph.calcPath: result = {}", rc.toString());
 123                 return;
 124             }
 125         }
 126         LOG.info("PcePathDescription ...");
 127         PcePathDescription description = new PcePathDescription(graph.getPathAtoZ(), nwAnalizer.getAllPceLinks(), rc);
 128         description.buildDescriptions();
 129         rc = description.getReturnStructure();
 130         if (!rc.getStatus()) {
 131             LOG.error("In pathComputationWithConstraints, description: result = {}", rc.toString());
 132             return;
 133         }
 134     }
 135
 136     public void pathComputation() throws Exception {
 137
 138         PceConstraintsCalc constraints = new PceConstraintsCalc(input, networkTransaction);
 139         pceHardConstraints = constraints.getPceHardConstraints();
 140         pceSoftConstraints = constraints.getPceSoftConstraints();
 141         pathComputationWithConstraints(pceHardConstraints, pceSoftConstraints);
 142         this.success = rc.getStatus();
 143         this.message = rc.getMessage();
 144         this.responseCode = rc.getResponseCode();
 145
 146         AToZDirection atoz = null;
 147         ZToADirection ztoa = null;
 148         if (rc.getStatus()) {
 149             atoz = rc.getAtoZDirection();
 150             ztoa = rc.getZtoADirection();
 151         }
 152
 153         //Connect to Gnpy to check path feasibility and recompute another path in case of path non-feasibility
 154         try {
 155             ConnectToGnpyServer connectToGnpy = new ConnectToGnpyServer();
 156             if (connectToGnpy.isGnpyURLExist()) {
 157                 GnpyUtilitiesImpl gnpy = new GnpyUtilitiesImpl(networkTransaction, input);
 158                 if (rc.getStatus() && gnpyToCheckFeasiblity(atoz,ztoa,gnpy)) {
 159                     setPathDescription(new PathDescriptionBuilder().setAToZDirection(atoz).setZToADirection(ztoa));
 160                     return;
 161                 }
 162                 callGnpyToComputeNewPath(gnpy);
 163             } else {
 164                 setPathDescription(new PathDescriptionBuilder().setAToZDirection(atoz).setZToADirection(ztoa));
 165                 return;
 166             }
 167         }
 168         catch (GnpyException e) {
 169             LOG.error("Exception raised by GNPy {}",e.getMessage());
 170             setPathDescription(new PathDescriptionBuilder().setAToZDirection(atoz).setZToADirection(ztoa));
 171             return;
 172         }
 173         return;
 174     }
 175
 176     private boolean gnpyToCheckFeasiblity(AToZDirection atoz, ZToADirection ztoa, GnpyUtilitiesImpl gnpy)
 177             throws GnpyException, Exception {
 178
 179         //Call GNPy for path verification
 180         if (gnpy.verifyComputationByGnpy(atoz, ztoa, pceHardConstraints)) {
 181             LOG.info("In pceSendingPceRPC: the path is feasible according to Gnpy");
 182             gnpyAtoZ = gnpy.getGnpyAtoZ();
 183             gnpyZtoA = gnpy.getGnpyZtoA();
 184             return true;
 185         }
 186         return false;
 187     }
 188
 189     private void callGnpyToComputeNewPath(GnpyUtilitiesImpl gnpy) throws GnpyException, Exception {
 190
 191         //Call GNPy in the case of non feasibility
 192         LOG.info("In pceSendingPceRPC: the path is not feasible according to Gnpy");
 193         HardConstraints gnpyPathAsHC = null;
 194         gnpyPathAsHC = gnpy.askNewPathFromGnpy(gnpyPathAsHC, pceHardConstraints);
 195         if (gnpyPathAsHC == null) {
 196             LOG.info("In pceSendingPceRPC: GNPy failed to find another path");
 197             this.success = false;
 198             this.message = "No path available by PCE and GNPy ";
 199             this.responseCode = ResponseCodes.RESPONSE_FAILED;
 200             gnpyAtoZ = gnpy.getGnpyAtoZ();
 201             gnpyZtoA = gnpy.getGnpyZtoA();
 202             return;
 203         }
 204
 205         LOG.info("In pceSendingPceRPC: GNPy succeed to find another path");
 206         // Compute the path
 207         PathComputationRequestInput inputFromGnpy = new PathComputationRequestInputBuilder()
 208             .setServiceName(input.getServiceName()).setHardConstraints(gnpyPathAsHC)
 209             .setSoftConstraints(input.getSoftConstraints()).setPceMetric(PceMetric.HopCount)
 210             .setServiceAEnd(input.getServiceAEnd()).setServiceZEnd(input.getServiceZEnd()).build();
 211         PceConstraintsCalc constraintsGnpy = new PceConstraintsCalc(inputFromGnpy, networkTransaction);
 212         PceConstraints gnpyHardConstraints = constraintsGnpy.getPceHardConstraints();
 213         PceConstraints gnpySoftConstraints = constraintsGnpy.getPceSoftConstraints();
 214         pathComputationWithConstraints(gnpyHardConstraints, gnpySoftConstraints);
 215         AToZDirection atoz = rc.getAtoZDirection();
 216         ZToADirection ztoa = rc.getZtoADirection();
 217         if (gnpyToCheckFeasiblity(atoz, ztoa,gnpy)) {
 218             LOG.info("In pceSendingPceRPC: the new path computed by GNPy is valid");
 219             this.success = true;
 220             this.message = "Path is calculated by GNPy";
 221             this.responseCode = ResponseCodes.RESPONSE_OK;
 222             setPathDescription(new PathDescriptionBuilder().setAToZDirection(atoz).setZToADirection(ztoa));
 223         } else {
 224             LOG.info("In pceSendingPceRPC: the new path computed by GNPy is not valid");
 225             this.success = false;
 226             this.message = "No path available";
 227             this.responseCode = ResponseCodes.RESPONSE_FAILED;
 228             setPathDescription(new PathDescriptionBuilder().setAToZDirection(null).setZToADirection(null));
 229         }
 230     }
 231
 232     private PceGraph patchRerunGraph(PceGraph graph) {
 233         LOG.info("In pathComputation patchRerunGraph : rerun Graph with metric = PROPAGATION-DELAY ");
 234         graph.setConstrains(pceHardConstraints, pceSoftConstraints);
 235         graph.calcPath();
 236         return graph;
 237     }
 238
 239     public PathDescriptionBuilder getPathDescription() {
 240         return pathDescription;
 241     }
 242
 243     private void setPathDescription(PathDescriptionBuilder pathDescription) {
 244         this.pathDescription = pathDescription;
 245     }
 246
 247     public Boolean getSuccess() {
 248         return this.success;
 249     }
 250
 251     public String getMessage() {
 252         return this.message;
 253     }
 254
 255     public String getResponseCode() {
 256         return this.responseCode;
 257     }
 258
 259     public GnpyResult getGnpyAtoZ() {
 260         return gnpyAtoZ;
 261     }
 262
 263     public GnpyResult getGnpyZtoA() {
 264         return gnpyZtoA;
 265     }
 266 }