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 import io.grpc.Server;
  26 import io.grpc.netty.NettyServerBuilder;
  27 import io.grpc.stub.StreamObserver;
  28 import java.io.IOException;
  29 import java.net.InetSocketAddress;
  30 import java.nio.file.Files;
  31 import java.nio.file.Paths;
  32 import org.onap.ccsdk.cds.controllerblueprints.processing.api.BluePrintProcessingServiceGrpc.BluePrintProcessingServiceImplBase;
  33 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceInput;
  34 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput;
  35 import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput.Builder;
  36 import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
  37
  38 /**
  39  * The Class GrpcTestDummyGrpcServer creates a dummy gRPC server to mimic a CDS implementation.
  40  */
  41 public class GrpcTestDummyGrpcServer {
  42     private Server server;
  43
  44     /**
  45      * Dummy server for gRPC.
  46      *
  47      * @param host hostname of the server
  48      * @param port port of the server
  49      */
  50     public GrpcTestDummyGrpcServer(String host, int port) {
  51         // Implement the dummy gRPC server
  52         BluePrintProcessingServiceImplBase testCdsBlueprintServerImpl = new BluePrintProcessingServiceImplBase() {
  53             @Override
  54             public StreamObserver<ExecutionServiceInput>
  55                 process(final StreamObserver<ExecutionServiceOutput> responseObserver) {
  56                 return new StreamObserver<ExecutionServiceInput>() {
  57                     @Override
  58                     public void onNext(final ExecutionServiceInput executionServiceInput) {
  59                         String responseString = "";
  60                         try {
  61                             responseString = Files.readString(Paths.get(
  62                                 "src/main/resources/examples/events/APEXgRPC/CreateSubscriptionResponseEvent.json"));
  63                         } catch (IOException e) {
  64                             throw new ApexEventRuntimeException("Cannot read executionServiceOutput from file", e);
  65                         }
  66                         ExecutionServiceOutput executionServiceOutput;
  67                         Builder builder = ExecutionServiceOutput.newBuilder();
  68                         try {
  69                             JsonFormat.parser().ignoringUnknownFields().merge(responseString, builder);
  70                             executionServiceOutput = builder.build();
  71                             responseObserver.onNext(executionServiceOutput);
  72                         } catch (InvalidProtocolBufferException e) {
  73                             throw new ApexEventRuntimeException(
  74                                 "Output string cannot be converted to ExecutionServiceOutput type for gRPC request."
  75                                     + e);
  76                         }
  77                     }
  78
  79                     @Override
  80                     public void onError(final Throwable throwable) {
  81                         responseObserver.onError(throwable);
  82                     }
  83
  84                     @Override
  85                     public void onCompleted() {
  86                         responseObserver.onCompleted();
  87                     }
  88                 };
  89             }
  90         };
  91         server = NettyServerBuilder.forAddress(new InetSocketAddress(host, port)).addService(testCdsBlueprintServerImpl)
  92             .build();
  93     }
  94
  95     public void start() throws IOException {
  96         server.start();
  97     }
  98
  99     public void stop() {
 100         server.shutdown();
 101     }
 102 }