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/*-
* ============LICENSE_START=======================================================
* ONAP CLAMP
* ================================================================================
* Copyright (C) 2020 AT&T Intellectual Property. 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.
* ============LICENSE_END============================================
* ===================================================================
*
*/
package org.onap.clamp.clds.client;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.builder.ExchangeBuilder;
import org.onap.clamp.clds.config.ClampProperties;
import org.onap.clamp.clds.sdc.controller.installer.BlueprintMicroService;
import org.onap.clamp.loop.template.PolicyModel;
import org.onap.clamp.loop.template.PolicyModelId;
import org.onap.clamp.loop.template.PolicyModelsRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.yaml.snakeyaml.Yaml;
/**
* The class implements the communication with the Policy Engine to retrieve
* policy models (tosca). It mainly delegates the physical calls to Camel
* engine.
*
*/
@Component
public class PolicyEngineServices {
private final CamelContext camelContext;
private final PolicyModelsRepository policyModelsRepository;
private static final EELFLogger logger = EELFManager.getInstance().getLogger(PolicyEngineServices.class);
private static final EELFLogger auditLogger = EELFManager.getInstance().getAuditLogger();
private static final EELFLogger metricsLogger = EELFManager.getInstance().getMetricsLogger();
private static int retryInterval = 0;
private static int retryLimit = 1;
public static final String POLICY_RETRY_INTERVAL = "policy.retry.interval";
public static final String POLICY_RETRY_LIMIT = "policy.retry.limit";
/**
* Default constructor.
*
* @param camelContext Camel context bean
* @param clampProperties ClampProperties bean
* @param policyModelsRepository policyModel repository bean
*/
@Autowired
public PolicyEngineServices(CamelContext camelContext, ClampProperties clampProperties,
PolicyModelsRepository policyModelsRepository) {
this.camelContext = camelContext;
this.policyModelsRepository = policyModelsRepository;
if (clampProperties.getStringValue(POLICY_RETRY_LIMIT) != null) {
retryLimit = Integer.valueOf(clampProperties.getStringValue(POLICY_RETRY_LIMIT));
}
if (clampProperties.getStringValue(POLICY_RETRY_INTERVAL) != null) {
retryInterval = Integer.valueOf(clampProperties.getStringValue(POLICY_RETRY_INTERVAL));
}
}
/**
* This method query Policy engine and create a PolicyModel object with type and version.
*
* @param policyType The policyType id
* @param policyVersion The policy version of that type
* @return A PolicyModel created from policyEngine data
*/
public PolicyModel createPolicyModelFromPolicyEngine(String policyType, String policyVersion) {
return new PolicyModel(policyType, this.downloadOnePolicy(policyType, policyVersion), policyVersion);
}
/**
* This method query Policy engine and create a PolicyModel object with type and version.
*
* @param microService microservice object instance
* @return A PolicyModel created from policyEngine data
*/
public PolicyModel createPolicyModelFromPolicyEngine(BlueprintMicroService microService) {
return createPolicyModelFromPolicyEngine(microService.getModelType(), microService.getModelVersion());
}
/**
* Thie method creates an PolicyModel in Db if it does not exist.
*
* @param policyModel The policyModel to save
*/
@Transactional(propagation = Propagation.REQUIRES_NEW)
public void createPolicyInDbIfNeeded(PolicyModel policyModel) {
if (!policyModelsRepository
.existsById(new PolicyModelId(policyModel.getPolicyModelType(), policyModel.getVersion()))) {
policyModelsRepository.save(policyModel);
}
}
/**
* This method synchronize the clamp database and the policy engine.
* So it creates the required PolicyModel.
*/
public void synchronizeAllPolicies() {
LinkedHashMap<String, Object> loadedYaml;
loadedYaml = new Yaml().load(downloadAllPolicies());
if (loadedYaml == null || loadedYaml.isEmpty()) {
logger.warn("getAllPolicyType yaml returned by policy engine could not be decoded, as it's null or empty");
return;
}
List<LinkedHashMap<String, Object>> policyTypesList = (List<LinkedHashMap<String, Object>>) loadedYaml
.get("policy_types");
policyTypesList.parallelStream().forEach(policyType -> {
Map.Entry<String, Object> policyTypeEntry = (Map.Entry<String, Object>) new ArrayList(policyType.entrySet()).get(0);
createPolicyInDbIfNeeded(
createPolicyModelFromPolicyEngine(policyTypeEntry.getKey(),
((String) ((LinkedHashMap<String, Object>) policyTypeEntry.getValue()).get("version"))));
});
}
/**
* This method can be used to download all policy types + data types defined in
* policy engine.
*
* @return A yaml containing all policy Types and all data types
* @throws InterruptedException In case of issue when sleeping during the retry
*/
public String downloadAllPolicies() {
return callCamelRoute(ExchangeBuilder.anExchange(camelContext).build(), "direct:get-all-policy-models");
}
/**
* This method can be used to download a policy tosca model on the engine.
*
* @param policyType The policy type (id)
* @param policyVersion The policy version
* @return A string with the whole policy tosca model
* @throws InterruptedException In case of issue when sleeping during the retry
*/
public String downloadOnePolicy(String policyType, String policyVersion) {
return callCamelRoute(ExchangeBuilder.anExchange(camelContext).withProperty("policyModelName", policyType)
.withProperty("policyModelVersion", policyVersion).build(), "direct:get-policy-model");
}
private String callCamelRoute(Exchange exchange, String camelFlow) {
for (int i = 0; i < retryLimit; i++) {
Exchange exchangeResponse = camelContext.createProducerTemplate().send(camelFlow, exchange);
if (Integer.valueOf(200).equals(exchangeResponse.getIn().getHeader("CamelHttpResponseCode"))) {
return (String) exchangeResponse.getIn().getBody();
} else {
logger.info("Policy query " + retryInterval + "ms before retrying ...");
// wait for a while and try to connect to DCAE again
try {
Thread.sleep(retryInterval);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
}
return "";
}
}
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