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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2020 Nordix Foundation.
* Modifications Copyright (C) 2020-2021 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.simulators;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.util.JsonFormat;
import io.grpc.Server;
import io.grpc.netty.NettyServerBuilder;
import io.grpc.stub.StreamObserver;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.time.Instant;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import lombok.Getter;
import org.apache.commons.lang3.StringUtils;
import org.onap.ccsdk.cds.controllerblueprints.common.api.EventType;
import org.onap.ccsdk.cds.controllerblueprints.common.api.Status;
import org.onap.ccsdk.cds.controllerblueprints.processing.api.BluePrintProcessingServiceGrpc.BluePrintProcessingServiceImplBase;
import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceInput;
import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput;
import org.onap.ccsdk.cds.controllerblueprints.processing.api.ExecutionServiceOutput.Builder;
import org.onap.policy.common.utils.resources.ResourceUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CdsSimulator implements Runnable {
private static final Logger LOGGER = LoggerFactory.getLogger(CdsSimulator.class);
@Getter
private final int port;
private final Server server;
private final String resourceLocation;
private AtomicInteger countOfEvents = new AtomicInteger(1);
/**
* Constructs the object, but does not start it.
*
* @param host host name of the server
* @param port port of the server
*/
public CdsSimulator(String host, int port) {
this(host, port, "org/onap/policy/simulators/cds/", 0, 0);
}
/**
* Constructs the object, but does not start it.
*
* @param host host name of the server
* @param port port of the server
* @param countOfSuccesfulEvents number of successive successful events
* @param requestedResponseDelayMs time for the request to be processed
*/
public CdsSimulator(String host, int port, String resourceLocation, int countOfSuccesfulEvents,
long requestedResponseDelayMs) {
this.port = port;
this.resourceLocation = resourceLocation;
BluePrintProcessingServiceImplBase testCdsBlueprintServerImpl = new BluePrintProcessingServiceImplBase() {
@Override
public StreamObserver<ExecutionServiceInput> process(
final StreamObserver<ExecutionServiceOutput> responseObserver) {
return new StreamObserver<ExecutionServiceInput>() {
@Override
public void onNext(final ExecutionServiceInput executionServiceInput) {
LOGGER.info("Received request input to CDS: {}", executionServiceInput);
try {
var builder = getResponse(executionServiceInput, countOfSuccesfulEvents);
TimeUnit.MILLISECONDS.sleep(requestedResponseDelayMs);
responseObserver.onNext(builder.build());
} catch (InvalidProtocolBufferException e) {
throw new SimulatorRuntimeException("Cannot convert ExecutionServiceOutput output", e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new SimulatorRuntimeException("Execution Interrupted", e);
}
}
@Override
public void onError(final Throwable throwable) {
responseObserver.onError(throwable);
}
@Override
public void onCompleted() {
responseObserver.onCompleted();
}
};
}
};
server = NettyServerBuilder.forAddress(new InetSocketAddress(host, port)).addService(testCdsBlueprintServerImpl)
.build();
}
/**
* Start the server.
*
* @throws IOException IO exception.
*/
public void start() throws IOException {
server.start();
// The grpc server uses daemon threads by default. Hence the application will exit as soon the main thread
// completes. So, wrap the server in a non-daemon thread and call awaitTermination to keep the thread alive
// until the server is terminated.
new Thread(this).start();
}
/**
* Stop the server.
*/
public void stop() {
server.shutdown();
}
/**
* Constructs the ResponseString on the basis of request.
*
* @param executionServiceInput service input
* @param countOfSuccesfulEvents number of successive successful events
* @return builder for ExecutionServiceOutput response
* @throws InvalidProtocolBufferException when response string cannot be converted
*/
public Builder getResponse(ExecutionServiceInput executionServiceInput, int countOfSuccesfulEvents)
throws InvalidProtocolBufferException {
var resourceName = "DefaultResponseEvent";
if (!StringUtils.isBlank(executionServiceInput.getActionIdentifiers().getActionName())) {
var actionIdentifiers = executionServiceInput.getActionIdentifiers();
resourceName = actionIdentifiers.getBlueprintName() + "-" + actionIdentifiers.getActionName();
}
if (countOfSuccesfulEvents > 0 && countOfEvents.getAndIncrement() % countOfSuccesfulEvents == 0) {
// generating the failure response
resourceName = resourceName + "-error.json";
} else {
resourceName = resourceName + ".json";
}
LOGGER.info("Fetching response from {}", resourceName);
var responseString = ResourceUtils.getResourceAsString(resourceLocation + resourceName);
var builder = ExecutionServiceOutput.newBuilder();
if (null == responseString) {
LOGGER.info("Expected response file {} not found in {}", resourceName, resourceLocation);
var actionIdentifiers = executionServiceInput.getActionIdentifiers();
builder.setCommonHeader(executionServiceInput.getCommonHeader());
builder.setActionIdentifiers(actionIdentifiers);
builder.setPayload(executionServiceInput.getPayload());
builder.setStatus(Status.newBuilder().setCode(500).setMessage("failure")
.setErrorMessage("failed to get get cba file name(" + actionIdentifiers.getBlueprintName()
+ "), version(" + actionIdentifiers.getBlueprintVersion() + ") from db : file check failed.")
.setEventType(EventType.EVENT_COMPONENT_FAILURE).setTimestamp(Instant.now().toString()));
} else {
LOGGER.debug("Returning response from CDS Simulator: {}", responseString);
JsonFormat.parser().ignoringUnknownFields().merge(responseString, builder);
}
return builder;
}
@Override
public void run() {
try {
server.awaitTermination();
} catch (InterruptedException e) {
LOGGER.info("gRPC server is terminated");
Thread.currentThread().interrupt();
}
}
}
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