models-interactions/model-simulators/src/main/java/org/onap/policy/simulators/CdsSimulator.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  *  Copyright (C) 2020 Nordix Foundation.
   4  *  Modifications Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
   5  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  *
  19  * SPDX-License-Identifier: Apache-2.0
  20  * ============LICENSE_END=========================================================
  21  */
  22
  23 package org.onap.policy.simulators;
  24
  25 import com.google.protobuf.InvalidProtocolBufferException;
  26 import com.google.protobuf.util.JsonFormat;
  27 import io.grpc.Server;
  28 import io.grpc.netty.NettyServerBuilder;
  29 import io.grpc.stub.StreamObserver;
  30 import java.io.IOException;
  31 import java.net.InetSocketAddress;
  32 import java.util.concurrent.TimeUnit;
  33 import java.util.concurrent.atomic.AtomicInteger;
  34 import lombok.Getter;
  35 import org.apache.commons.lang3.StringUtils;
  36 import org.onap.ccsdk.cds.controllerblueprints.common.api.ActionIdentifiers;
  37 import org.onap.ccsdk.cds.controllerblueprints.processing.api.BluePrintProcessingServiceGrpc.BluePrintProcessingServiceImplBase;
  38 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceInput;
  39 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput;
  40 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput.Builder;
  41 import org.onap.policy.common.utils.resources.ResourceUtils;
  42
  43 public class CdsSimulator {
  44     @Getter
  45     private final int port;
  46
  47     private final Server server;
  48
  49     private final String resourceLocation;
  50
  51     private AtomicInteger countOfEvents = new AtomicInteger(1);
  52
  53     /**
  54      * Constructs the object, but does not start it.
  55      *
  56      * @param host host name of the server
  57      * @param port port of the server
  58      */
  59     public CdsSimulator(String host, int port) {
  60         this(host, port, "org/onap/policy/simulators/cds/", 0, 0);
  61     }
  62
  63     /**
  64      * Constructs the object, but does not start it.
  65      *
  66      * @param host host name of the server
  67      * @param port port of the server
  68      * @param countOfSuccesfulEvents number of successive successful events
  69      * @param requestedResponseDelayMs time for the request to be processed
  70      */
  71     public CdsSimulator(String host, int port, String resourceLocation, int countOfSuccesfulEvents,
  72         long requestedResponseDelayMs) {
  73         this.port = port;
  74         this.resourceLocation = resourceLocation;
  75
  76         BluePrintProcessingServiceImplBase testCdsBlueprintServerImpl = new BluePrintProcessingServiceImplBase() {
  77
  78             @Override
  79             public StreamObserver<ExecutionServiceInput> process(
  80                             final StreamObserver<ExecutionServiceOutput> responseObserver) {
  81
  82                 return new StreamObserver<ExecutionServiceInput>() {
  83
  84                     @Override
  85                     public void onNext(final ExecutionServiceInput executionServiceInput) {
  86                         try {
  87                             String responseString = getResponseString(executionServiceInput, countOfSuccesfulEvents);
  88                             Builder builder = ExecutionServiceOutput.newBuilder();
  89                             JsonFormat.parser().ignoringUnknownFields().merge(responseString, builder);
  90                             TimeUnit.MILLISECONDS.sleep(requestedResponseDelayMs);
  91                             responseObserver.onNext(builder.build());
  92                         } catch (InvalidProtocolBufferException e) {
  93                             throw new SimulatorRuntimeException("Cannot convert ExecutionServiceOutput output", e);
  94                         } catch (InterruptedException e) {
  95                             Thread.currentThread().interrupt();
  96                             throw new SimulatorRuntimeException("Execution Interrupted", e);
  97                         }
  98                     }
  99
 100                     @Override
 101                     public void onError(final Throwable throwable) {
 102                         responseObserver.onError(throwable);
 103                     }
 104
 105                     @Override
 106                     public void onCompleted() {
 107                         responseObserver.onCompleted();
 108                     }
 109                 };
 110             }
 111         };
 112
 113         server = NettyServerBuilder.forAddress(new InetSocketAddress(host, port)).addService(testCdsBlueprintServerImpl)
 114                         .build();
 115     }
 116
 117     public void start() throws IOException {
 118         server.start();
 119     }
 120
 121     public void stop() {
 122         server.shutdown();
 123     }
 124
 125     /**
 126      * Constructs the ResponseString on the basis of request.
 127      *
 128      * @param executionServiceInput service input
 129      * @param countOfSuccesfulEvents number of successive successful events
 130      * @return  responseString
 131      */
 132     public String getResponseString(ExecutionServiceInput executionServiceInput, int countOfSuccesfulEvents) {
 133         String resourceName = "DefaultResponseEvent";
 134         if (!StringUtils.isBlank(executionServiceInput.getActionIdentifiers().getActionName())) {
 135             ActionIdentifiers actionIdentifiers = executionServiceInput.getActionIdentifiers();
 136             resourceName = actionIdentifiers.getBlueprintName() + "-" + actionIdentifiers.getActionName();
 137         }
 138         if (countOfSuccesfulEvents > 0 && countOfEvents.getAndIncrement() % countOfSuccesfulEvents == 0) {
 139             // generating the failure response
 140             resourceName = resourceName + "-error.json";
 141         } else {
 142             resourceName = resourceName + ".json";
 143         }
 144         String responseString = ResourceUtils.getResourceAsString(resourceLocation + resourceName);
 145         if (responseString == null) {
 146             responseString = ResourceUtils.getResourceAsString(resourceLocation
 147                 + "DefaultResponseEvent.json");
 148         }
 149         return responseString;
 150     }
 151 }