examples/examples-grpc/src/test/java/org/onap/policy/apex/examples/grpc/GrpcTestDummyGrpcServer.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  *  Copyright (C) 2020 Nordix Foundation.
   4  * ================================================================================
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *      http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  * SPDX-License-Identifier: Apache-2.0
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.onap.policy.apex.examples.grpc;
  22
  23 import com.google.protobuf.InvalidProtocolBufferException;
  24 import com.google.protobuf.util.JsonFormat;
  25
  26 import io.grpc.Server;
  27 import io.grpc.netty.NettyServerBuilder;
  28 import io.grpc.stub.StreamObserver;
  29
  30 import java.io.IOException;
  31 import java.net.InetSocketAddress;
  32 import java.nio.file.Files;
  33 import java.nio.file.Paths;
  34
  35 import org.onap.ccsdk.cds.controllerblueprints.processing.api.BluePrintProcessingServiceGrpc.BluePrintProcessingServiceImplBase;
  36 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceInput;
  37 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput;
  38 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput.Builder;
  39 import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
  40
  41 /**
  42  * The Class GrpcTestDummyGrpcServer creates a dummy gRPC server to mimic a CDS implementation.
  43  */
  44 public class GrpcTestDummyGrpcServer {
  45     private Server server;
  46
  47     /**
  48      * Dummy server for gRPC.
  49      *
  50      * @param host hostname of the server
  51      * @param port port of the server
  52      */
  53     public GrpcTestDummyGrpcServer(String host, int port) {
  54         // Implement the dummy gRPC server
  55         BluePrintProcessingServiceImplBase testCdsBlueprintServerImpl = new BluePrintProcessingServiceImplBase() {
  56             @Override
  57             public StreamObserver<ExecutionServiceInput>
  58                 process(final StreamObserver<ExecutionServiceOutput> responseObserver) {
  59                 return new StreamObserver<ExecutionServiceInput>() {
  60                     @Override
  61                     public void onNext(final ExecutionServiceInput executionServiceInput) {
  62                         String responseString = "";
  63                         try {
  64                             responseString = Files.readString(Paths.get(
  65                                 "src/main/resources/examples/events/APEXgRPC/CreateSubscriptionResponseEvent.json"));
  66                         } catch (IOException e) {
  67                             throw new ApexEventRuntimeException("Cannot read executionServiceOutput from file", e);
  68                         }
  69                         ExecutionServiceOutput executionServiceOutput;
  70                         Builder builder = ExecutionServiceOutput.newBuilder();
  71                         try {
  72                             JsonFormat.parser().ignoringUnknownFields().merge(responseString, builder);
  73                             executionServiceOutput = builder.build();
  74                             responseObserver.onNext(executionServiceOutput);
  75                         } catch (InvalidProtocolBufferException e) {
  76                             throw new ApexEventRuntimeException(
  77                                 "Output string cannot be converted to ExecutionServiceOutput type for gRPC request."
  78                                     + e);
  79                         }
  80                     }
  81
  82                     @Override
  83                     public void onError(final Throwable throwable) {
  84                         responseObserver.onError(throwable);
  85                     }
  86
  87                     @Override
  88                     public void onCompleted() {
  89                         responseObserver.onCompleted();
  90                     }
  91                 };
  92             }
  93         };
  94         server = NettyServerBuilder.forAddress(new InetSocketAddress(host, port)).addService(testCdsBlueprintServerImpl)
  95             .build();
  96     }
  97
  98     public void start() throws IOException {
  99         server.start();
 100     }
 101
 102     public void stop() {
 103         server.shutdown();
 104     }
 105 }