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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2019 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.openecomp.core.converter.impl.pnfd;
import java.io.InputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.MapUtils;
import org.onap.sdc.tosca.datatypes.model.ServiceTemplate;
import org.onap.sdc.tosca.datatypes.model.TopologyTemplate;
import org.openecomp.core.converter.ServiceTemplateReaderService;
import org.openecomp.core.converter.impl.pnfd.factory.PnfdBlockParserFactory;
import org.openecomp.core.converter.impl.pnfd.parser.ConversionQueryYamlParser;
import org.openecomp.core.converter.pnfd.model.Transformation;
import org.openecomp.core.converter.pnfd.model.TransformationBlock;
import org.openecomp.core.converter.pnfd.model.TransformationDescription;
import org.openecomp.sdc.logging.api.Logger;
import org.openecomp.sdc.logging.api.LoggerFactory;
/**
* Engine that manages the PNF Descriptor transformation process.
*/
public class PnfdTransformationEngine {
private static final Logger LOGGER = LoggerFactory.getLogger(PnfdTransformationEngine.class);
private final ServiceTemplate templateTo;
private final ServiceTemplateReaderService templateFrom;
private final PnfdTransformationDescriptorReader pnfdTransformationDescriptorReader =
new PnfdTransformationDescriptorReader();
private TransformationDescription transformationDescription;
private Map<TransformationBlock, List<Transformation>> transformationGroupByBlockMap;
private final String descriptorResourcePath;
public PnfdTransformationEngine(final ServiceTemplateReaderService templateFrom, final ServiceTemplate templateTo) {
this(templateFrom, templateTo, "pnfdTransformationTemplate/model-driven-conversion.yaml");
}
//used for tests purposes
PnfdTransformationEngine(final ServiceTemplateReaderService templateFrom, final ServiceTemplate templateTo,
final String descriptorResourcePath) {
this.templateFrom = templateFrom;
this.templateTo = templateTo;
this.descriptorResourcePath = descriptorResourcePath;
}
/**
* Runs the transformation process.
*/
public void transform() {
readDefinition();
initializeTopologyTemplate();
executeTransformations();
}
/**
* Initializes the topology template and its node template set.
*/
private void initializeTopologyTemplate() {
TopologyTemplate topologyTemplate = templateTo.getTopology_template();
if (topologyTemplate == null) {
topologyTemplate = new TopologyTemplate();
templateTo.setTopology_template(topologyTemplate);
}
if (topologyTemplate.getNode_templates() == null) {
topologyTemplate.setNode_templates(new HashMap<>());
}
}
/**
* Reads the transformation description yaml file.
*/
private void readDefinition() {
transformationDescription = pnfdTransformationDescriptorReader.parse(getDefinitionFileInputStream());
}
/**
* Execute all transformations specified in the descriptor.
*/
private void executeTransformations() {
final Set<Transformation> transformationSet = transformationDescription.getTransformationSet();
if (CollectionUtils.isEmpty(transformationSet)) {
return;
}
transformationGroupByBlockMap = transformationSet.stream()
.filter(Transformation::isValid)
.collect(Collectors.groupingBy(Transformation::getBlock));
final Map<String, String> inputsToConvertMap = executeNodeTemplateTransformations();
executeGetInputFunctionTransformations(inputsToConvertMap);
}
/**
* Parses all topology_template node_template.
* @return
* A map containing any input that was called with a get_input TOSCA function and its getInputFunction
* transformation name
*/
private Map<String, String> executeNodeTemplateTransformations() {
final List<Transformation> transformationList = transformationGroupByBlockMap
.get(TransformationBlock.NODE_TEMPLATE);
if (CollectionUtils.isEmpty(transformationList)) {
return Collections.emptyMap();
}
final Map<String, String> inputsToConvertMap = new HashMap<>();
transformationList.forEach(transformation ->
PnfdBlockParserFactory.getInstance().get(transformation).ifPresent(pnfParser -> {
pnfParser.parse(templateFrom, templateTo);
if (pnfParser.getInputAndTransformationNameMap().isPresent()) {
inputsToConvertMap.putAll(pnfParser.getInputAndTransformationNameMap().get());
}
}));
return inputsToConvertMap;
}
/**
* Parses all topology_template inputs called with a get_input TOSCA function.
* @param inputsToConvertMap A map containing the topology_template input name and its conversion definition name
*/
private void executeGetInputFunctionTransformations(final Map<String, String> inputsToConvertMap) {
final List<Transformation> transformationListOfGetInputFunction = transformationGroupByBlockMap
.get(TransformationBlock.GET_INPUT_FUNCTION);
if(MapUtils.isEmpty(inputsToConvertMap) || CollectionUtils.isEmpty(transformationListOfGetInputFunction)) {
return;
}
final Map<String, List<Transformation>> transformationByName = transformationListOfGetInputFunction.stream()
.collect(Collectors.groupingBy(Transformation::getName));
inputsToConvertMap.forEach((inputName, transformationName) -> {
final List<Transformation> transformationList = transformationByName.get(transformationName);
if (!CollectionUtils.isEmpty(transformationList)) {
final Transformation transformation = transformationList.stream()
.findFirst().orElse(null);
if (transformation != null) {
final Map<String, Object> conversionQueryMap = new HashMap<>();
conversionQueryMap.put(inputName, null);
transformation.setConversionQuery(ConversionQueryYamlParser.parse(conversionQueryMap));
PnfdBlockParserFactory.getInstance().get(transformation)
.ifPresent(pnfParser -> pnfParser.parse(templateFrom, templateTo));
}
}
});
}
/**
* Gets the transformation definition yaml file path.
* @return The transformation definition yaml path.
*/
private InputStream getDefinitionFileInputStream() {
final InputStream resourceAsStream = getClass().getClassLoader().getResourceAsStream(descriptorResourcePath);
if (resourceAsStream == null) {
if (LOGGER.isErrorEnabled()) {
LOGGER.error(String.format("Could not find resource '%s'", descriptorResourcePath));
}
return null;
}
return resourceAsStream;
}
}
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