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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2018 Ericsson. All rights reserved.
* Copyright (C) 2019 Intel Corp. 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.distribution.forwarding.apex.pdp;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import org.apache.commons.io.IOUtils;
import org.onap.policy.apex.core.deployment.EngineServiceFacade;
import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
import org.onap.policy.common.parameters.ParameterService;
import org.onap.policy.distribution.forwarding.PolicyForwarder;
import org.onap.policy.distribution.forwarding.PolicyForwardingException;
import org.onap.policy.models.tosca.authorative.concepts.ToscaEntity;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class provides an implementation of {@link PolicyForwarder} interface for forwarding the given policies to
* apex-pdp.
*
* @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
*/
public class ApexPdpPolicyForwarder implements PolicyForwarder {
private static final Logger LOGGER = LoggerFactory.getLogger(ApexPdpPolicyForwarder.class);
private static final String POLICY_TYPE = "APEX";
private ApexPdpPolicyForwarderParameterGroup apexForwarderParameters;
private EngineServiceFacade engineServiceFacade;
/**
* {@inheritDoc}.
*/
@Override
public void configure(final String parameterGroupName) {
apexForwarderParameters = ParameterService.get(parameterGroupName);
engineServiceFacade =
new EngineServiceFacade(apexForwarderParameters.getHostname(), apexForwarderParameters.getPort());
}
/**
* {@inheritDoc}.
*/
@Override
public void forward(final Collection<ToscaEntity> policies) throws PolicyForwardingException {
if (policies.isEmpty()) {
final String message = "No apex policy to be forwarded to an apex engine";
LOGGER.debug(message);
throw new PolicyForwardingException(message);
} else if (policies.size() > 1) {
final String message = "More than one apex policy cannot be forwarded to an apex engine";
LOGGER.debug(message);
throw new PolicyForwardingException(message);
} else {
final ToscaEntity policy = (ToscaEntity) policies.toArray()[0];
if (policy instanceof ToscaPolicy) {
final ToscaPolicy toscaPolicy = (ToscaPolicy) policy;
if (POLICY_TYPE.equalsIgnoreCase(toscaPolicy.getType())) {
forwardPolicy(toscaPolicy);
} else {
final String message = "Ignoring the policy as it is not an apex-pdp policy";
LOGGER.debug(message);
throw new PolicyForwardingException(message);
}
} else {
final String message = "Ignoring the policy as it is not of type ToscaPolicy";
LOGGER.debug(message);
throw new PolicyForwardingException(message);
}
}
}
/**
* Method to forward a given policy to apex-pdp.
*
* @param apexPolicy the apex policy
* @throws PolicyForwardingException if any exception occurs while forwarding policy
*/
private void forwardPolicy(final ToscaPolicy apexPolicy) throws PolicyForwardingException {
try {
engineServiceFacade.init();
final InputStream policyInputStream = IOUtils.toInputStream(apexPolicy.toString(), "UTF-8");
engineServiceFacade.deployModel(apexPolicy.getName(), policyInputStream,
apexForwarderParameters.isIgnoreConflicts(), apexForwarderParameters.isForceUpdate());
LOGGER.debug("Sucessfully forwarded the policy to apex-pdp egine at {}:{}",
apexForwarderParameters.getHostname(), apexForwarderParameters.getPort());
} catch (final ApexException | IOException exp) {
final String message = "Error sending policy to apex-pdp engine at" + apexForwarderParameters.getHostname()
+ ":" + apexForwarderParameters.getPort();
LOGGER.error(message, exp);
throw new PolicyForwardingException(message, exp);
}
}
}
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