gerrit.onap Code Review - policy/distribution.git/blob

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  *  Copyright (C) 2018 Ericsson. All rights reserved.
   4  *  Copyright (C) 2019 Intel Corp. All rights reserved.
   5  * ================================================================================
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *      http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * SPDX-License-Identifier: Apache-2.0
  19  * ============LICENSE_END=========================================================
  20  */
  21
  22 package org.onap.policy.distribution.forwarding.apex.pdp;
  23
  24 import java.io.IOException;
  25 import java.io.InputStream;
  26 import java.util.Collection;
  27
  28 import org.apache.commons.io.IOUtils;
  29 import org.onap.policy.apex.core.deployment.EngineServiceFacade;
  30 import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
  31 import org.onap.policy.common.parameters.ParameterService;
  32 import org.onap.policy.distribution.forwarding.PolicyForwarder;
  33 import org.onap.policy.distribution.forwarding.PolicyForwardingException;
  34 import org.onap.policy.distribution.forwarding.xacml.pdp.XacmlPdpPolicyForwarder;
  35 import org.onap.policy.distribution.model.Policy;
  36 import org.onap.policy.distribution.model.PolicyAsString;
  37
  38 import org.slf4j.Logger;
  39 import org.slf4j.LoggerFactory;
  40
  41 /**
  42  * This class provides an implementation of {@link PolicyForwarder} interface for forwarding the given policies to
  43  * apex-pdp.
  44  *
  45  * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
  46  */
  47 public class ApexPdpPolicyForwarder implements PolicyForwarder {
  48
  49     private static final Logger LOGGER = LoggerFactory.getLogger(XacmlPdpPolicyForwarder.class);
  50     private static final String POLICY_TYPE = "APEX";
  51
  52     private ApexPdpPolicyForwarderParameterGroup apexForwarderParameters;
  53     private EngineServiceFacade engineServiceFacade;
  54
  55     /**
  56      * {@inheritDoc}.
  57      */
  58     @Override
  59     public void configure(final String parameterGroupName) {
  60         apexForwarderParameters = ParameterService.get(parameterGroupName);
  61         engineServiceFacade =
  62                 new EngineServiceFacade(apexForwarderParameters.getHostname(), apexForwarderParameters.getPort());
  63
  64     }
  65
  66     /**
  67      * {@inheritDoc}.
  68      */
  69     @Override
  70     public void forward(final Collection<Policy> policies) throws PolicyForwardingException {
  71         if (policies.isEmpty()) {
  72             final String message = "No apex policy to be forwarded to an apex engine";
  73             LOGGER.debug(message);
  74             throw new PolicyForwardingException(message);
  75         } else if (policies.size() > 1) {
  76             final String message = "More than one apex policy cannot be forwarded to an apex engine";
  77             LOGGER.debug(message);
  78             throw new PolicyForwardingException(message);
  79         } else {
  80             final Policy policy = (Policy) policies.toArray()[0];
  81             if (policy.getClass().isAssignableFrom(PolicyAsString.class)
  82                     && policy.getPolicyType().equalsIgnoreCase(POLICY_TYPE)) {
  83                 forwardPolicy((PolicyAsString) policy);
  84             } else {
  85                 final String message = "Ignoring the policy as it is not an apex-pdp policy";
  86                 LOGGER.debug(message);
  87                 throw new PolicyForwardingException(message);
  88             }
  89         }
  90     }
  91
  92     /**
  93      * Method to forward a given policy to apex-pdp.
  94      *
  95      * @param apexPolicy the apex policy
  96      * @throws PolicyForwardingException if any exception occurs while forwarding policy
  97      */
  98     private void forwardPolicy(final PolicyAsString apexPolicy) throws PolicyForwardingException {
  99         try {
 100             engineServiceFacade.init();
 101             final InputStream policyInputStream = IOUtils.toInputStream(apexPolicy.getPolicy(), "UTF-8");
 102             engineServiceFacade.deployModel(apexPolicy.getPolicyName(), policyInputStream,
 103                     apexForwarderParameters.isIgnoreConflicts(), apexForwarderParameters.isForceUpdate());
 104
 105             LOGGER.debug("Sucessfully forwarded the policy to apex-pdp egine at {}:{}",
 106                     apexForwarderParameters.getHostname(), apexForwarderParameters.getPort());
 107
 108         } catch (final ApexException | IOException exp) {
 109             final String message = "Error sending policy to apex-pdp engine at" + apexForwarderParameters.getHostname()
 110                     + ":" + apexForwarderParameters.getPort();
 111             LOGGER.error(message, exp);
 112             throw new PolicyForwardingException(message, exp);
 113         }
 114     }
 115 }
 116