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/*-
* ============LICENSE_START=======================================================
* ONAP Policy API
* ================================================================================
* Copyright (C) 2019-2020 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2019-2020 Nordix Foundation.
* ================================================================================
* 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.api.main.startstop;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import org.onap.policy.api.main.exception.PolicyApiException;
import org.onap.policy.api.main.parameters.ApiParameterGroup;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardYamlCoder;
import org.onap.policy.common.utils.resources.ResourceUtils;
import org.onap.policy.models.base.PfModelException;
import org.onap.policy.models.base.PfModelRuntimeException;
import org.onap.policy.models.provider.PolicyModelsProvider;
import org.onap.policy.models.provider.PolicyModelsProviderFactory;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeFilter;
import org.onap.policy.models.tosca.authorative.concepts.ToscaServiceTemplate;
import org.onap.policy.models.tosca.authorative.concepts.ToscaTopologyTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class creates initial policy types in the database.
*
* @author Chenfei Gao (cgao@research.att.com)
*/
public class ApiDatabaseInitializer {
private static final Logger LOGGER = LoggerFactory.getLogger(ApiDatabaseInitializer.class);
private static final StandardYamlCoder coder = new StandardYamlCoder();
private PolicyModelsProviderFactory factory;
/**
* Constructs the object.
*/
public ApiDatabaseInitializer() {
factory = new PolicyModelsProviderFactory();
}
/**
* Initializes database by preloading policy types and policies.
*
* @param apiParameterGroup the apiParameterGroup parameters
* @throws PolicyApiException in case of errors.
*/
public void initializeApiDatabase(final ApiParameterGroup apiParameterGroup) throws PolicyApiException {
try (PolicyModelsProvider databaseProvider =
factory.createPolicyModelsProvider(apiParameterGroup.getDatabaseProviderParameters())) {
if (alreadyExists(databaseProvider)) {
LOGGER.warn("DB already contains policy data - skipping preload");
return;
}
ToscaServiceTemplate serviceTemplate = new ToscaServiceTemplate();
serviceTemplate.setDataTypes(new LinkedHashMap<>());
serviceTemplate.setPolicyTypes(new LinkedHashMap<>());
serviceTemplate.setToscaDefinitionsVersion("tosca_simple_yaml_1_1_0");
ToscaServiceTemplate createdPolicyTypes = preloadServiceTemplate(serviceTemplate,
apiParameterGroup.getPreloadPolicyTypes(), databaseProvider::createPolicyTypes);
preloadServiceTemplate(createdPolicyTypes,
apiParameterGroup.getPreloadPolicies(), databaseProvider::createPolicies);
} catch (final PolicyApiException | PfModelException | CoderException exp) {
throw new PolicyApiException(exp);
}
}
private boolean alreadyExists(PolicyModelsProvider databaseProvider) throws PfModelException {
try {
ToscaServiceTemplate serviceTemplate =
databaseProvider.getFilteredPolicyTypes(ToscaPolicyTypeFilter.builder().build());
if (!serviceTemplate.getPolicyTypes().isEmpty()) {
return true;
}
} catch (PfModelRuntimeException e) {
LOGGER.trace("DB does not yet contain policy types", e);
}
return false;
}
private ToscaServiceTemplate preloadServiceTemplate(ToscaServiceTemplate serviceTemplate,
List<String> entities, FunctionWithEx<ToscaServiceTemplate, ToscaServiceTemplate> getter)
throws PolicyApiException, CoderException, PfModelException {
for (String entity : entities) {
String entityAsStringYaml = ResourceUtils.getResourceAsString(entity);
if (entityAsStringYaml == null) {
LOGGER.warn("Preloading entity cannot be found: {}", entity);
continue;
}
ToscaServiceTemplate singleEntity =
coder.decode(entityAsStringYaml, ToscaServiceTemplate.class);
if (singleEntity == null) {
throw new PolicyApiException("Error deserializaing entity from file: " + entity);
}
// Consolidate data types and policy types
if (singleEntity.getDataTypes() != null) {
serviceTemplate.getDataTypes().putAll(singleEntity.getDataTypes());
}
if (singleEntity.getPolicyTypes() != null) {
serviceTemplate.getPolicyTypes().putAll(singleEntity.getPolicyTypes());
}
// Consolidate policies
ToscaTopologyTemplate topologyTemplate = singleEntity.getToscaTopologyTemplate();
if (topologyTemplate != null && topologyTemplate.getPolicies() != null) {
serviceTemplate.setToscaTopologyTemplate(new ToscaTopologyTemplate());
serviceTemplate.getToscaTopologyTemplate().setPolicies(new LinkedList<>());
serviceTemplate.getToscaTopologyTemplate().getPolicies()
.addAll(singleEntity.getToscaTopologyTemplate().getPolicies());
}
}
// Preload the specified entities
ToscaServiceTemplate createdServiceTemplate = getter.apply(serviceTemplate);
LOGGER.debug("Created initial tosca service template in DB - {}", createdServiceTemplate);
return createdServiceTemplate;
}
@FunctionalInterface
protected interface FunctionWithEx<T, R> {
public R apply(T value) throws PfModelException;
}
}
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