package com.thinkbiganalytics.nifi.feedmgr;
/*-
* #%L
* thinkbig-nifi-rest-client-api
* %%
* Copyright (C) 2017 ThinkBig Analytics
* %%
* 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.
* #L%
*/
import com.google.common.collect.Lists;
import com.thinkbiganalytics.nifi.rest.client.LegacyNifiRestClient;
import com.thinkbiganalytics.nifi.rest.client.layout.AlignProcessGroupComponents;
import com.thinkbiganalytics.nifi.rest.model.NifiError;
import com.thinkbiganalytics.nifi.rest.model.NifiProcessGroup;
import com.thinkbiganalytics.nifi.rest.model.NifiProperty;
import com.thinkbiganalytics.nifi.rest.support.NifiProcessUtil;
import com.thinkbiganalytics.nifi.rest.support.NifiPropertyUtil;
import org.apache.commons.lang3.StringUtils;
import org.apache.nifi.web.api.dto.ProcessGroupDTO;
import org.apache.nifi.web.api.dto.ProcessorDTO;
import org.apache.nifi.web.api.dto.TemplateDTO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
/**
* Class used to create templates in NiFi
*/
public class TemplateInstanceCreator {
private static final Logger log = LoggerFactory.getLogger(TemplateInstanceCreator.class);
private String templateId;
private LegacyNifiRestClient restClient;
private boolean createReusableFlow;
private Map<String, Object> staticConfigPropertyMap;
private Map<String, String> staticConfigPropertyStringMap;
private ReusableTemplateCreationCallback creationCallback;
public TemplateInstanceCreator(LegacyNifiRestClient restClient, String templateId, Map<String, Object> staticConfigPropertyMap, boolean createReusableFlow,
ReusableTemplateCreationCallback creationCallback) {
this.restClient = restClient;
this.templateId = templateId;
this.createReusableFlow = createReusableFlow;
this.staticConfigPropertyMap = staticConfigPropertyMap;
if (staticConfigPropertyMap != null) {
//transform the object map to the String map
staticConfigPropertyStringMap = staticConfigPropertyMap.entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, e -> e.getValue() != null ? e.getValue().toString() : null));
}
if (staticConfigPropertyStringMap == null) {
staticConfigPropertyStringMap = new HashMap<>();
}
this.creationCallback = creationCallback;
}
public boolean isCreateReusableFlow() {
return createReusableFlow;
}
private void ensureInputPortsForReuseableTemplate(String processGroupId) {
ProcessGroupDTO template = restClient.getProcessGroup(processGroupId, false, false);
String categoryId = template.getParentGroupId();
restClient.createReusableTemplateInputPort(categoryId, processGroupId);
}
public NifiProcessGroup createTemplate() throws TemplateCreationException {
try {
NifiProcessGroup newProcessGroup = null;
TemplateDTO template = restClient.getTemplateById(templateId);
if (template != null) {
TemplateCreationHelper templateCreationHelper = new TemplateCreationHelper(this.restClient);
String processGroupId = null;
ProcessGroupDTO group = null;
if (isCreateReusableFlow()) {
log.info("Creating a new Reusable flow instance for template: {} ", template.getName());
//1 get/create the parent "reusable_templates" processgroup
ProcessGroupDTO reusableParentGroup = restClient.getProcessGroupByName("root", TemplateCreationHelper.REUSABLE_TEMPLATES_PROCESS_GROUP_NAME);
if (reusableParentGroup == null) {
reusableParentGroup = restClient.createProcessGroup("root", TemplateCreationHelper.REUSABLE_TEMPLATES_PROCESS_GROUP_NAME);
}
ProcessGroupDTO thisGroup = restClient.getProcessGroupByName(reusableParentGroup.getId(), template.getName());
if (thisGroup != null) {
//version the group
log.info("A previous Process group of with this name {} was found. Versioning it before continuing", thisGroup.getName());
templateCreationHelper.versionProcessGroup(thisGroup);
}
group = restClient.createProcessGroup(reusableParentGroup.getId(), template.getName());
} else {
String tmpName = template.getName() + "_" + System.currentTimeMillis();
group = restClient.createProcessGroup(tmpName);
log.info("Creating a temporary process group with name {} for template {} ", tmpName, template.getName());
}
processGroupId = group.getId();
if (StringUtils.isNotBlank(processGroupId)) {
//snapshot the existing controller services
templateCreationHelper.snapshotControllerServiceReferences();
log.info("Successfully Snapshot of controller services");
//create the flow from the template
templateCreationHelper.instantiateFlowFromTemplate(processGroupId, templateId);
log.info("Successfully created the temp flow");
if (this.createReusableFlow) {
ensureInputPortsForReuseableTemplate(processGroupId);
log.info("Reusable flow, input ports created successfully.");
}
//mark the new services that were created as a result of creating the new flow from the template
templateCreationHelper.identifyNewlyCreatedControllerServiceReferences();
ProcessGroupDTO entity = restClient.getProcessGroup(processGroupId, true, true);
//replace static properties and inject values into the flow
List<NifiProperty> processorProperties = NifiPropertyUtil.getProperties(entity, restClient.getPropertyDescriptorTransform());
if (processorProperties != null) {
boolean didReplace = false;
for (NifiProperty property : processorProperties) {
boolean replaced = ConfigurationPropertyReplacer.resolveStaticConfigurationProperty(property, staticConfigPropertyMap);
if (replaced) {
//update the properties that are replaced
restClient.updateProcessorProperty(property.getProcessGroupId(), property.getProcessorId(), property);
didReplace = true;
}
}
//if we replaced any properties, refetch to get the latest data
if (didReplace) {
entity = restClient.getProcessGroup(processGroupId, true, true);
}
}
//identify the various processors (first level initial processors)
List<ProcessorDTO> inputProcessors = NifiProcessUtil.getInputProcessors(entity);
ProcessorDTO input = null;
List<ProcessorDTO> nonInputProcessors = NifiProcessUtil.getNonInputProcessors(entity);
//if the input is null attempt to get the first input available on the template
if (input == null && inputProcessors != null && !inputProcessors.isEmpty()) {
input = inputProcessors.get(0);
}
log.info("Attempt to update/validate controller services for template.");
//update any references to the controller services and try to assign the value to an enabled service if it is not already
boolean updatedControllerServices = false;
if (input != null) {
log.info("attempt to update controllerservices on {} input processor ", input.getName());
List<NifiProperty> updatedProperties = templateCreationHelper.updateControllerServiceReferences(Lists.newArrayList(inputProcessors), staticConfigPropertyStringMap);
updatedControllerServices = !updatedProperties.isEmpty();
}
log.info("attempt to update controllerservices on {} processors ", (nonInputProcessors != null ? nonInputProcessors.size() : 0));
List<NifiProperty> updatedProperties = templateCreationHelper.updateControllerServiceReferences(nonInputProcessors, staticConfigPropertyStringMap);
if(!updatedControllerServices){
updatedControllerServices = !updatedProperties.isEmpty();
}
log.info("Controller service validation complete");
//refetch processors for updated errors
entity = restClient.getProcessGroup(processGroupId, true, true);
nonInputProcessors = NifiProcessUtil.getNonInputProcessors(entity);
inputProcessors = NifiProcessUtil.getInputProcessors(entity);
if(inputProcessors != null && !inputProcessors.isEmpty()) {
input = inputProcessors.get(0);
}
///make the input/output ports in the category group as running
if (isCreateReusableFlow()) {
log.info("Reusable flow, attempt to mark the connection ports as running.");
templateCreationHelper.markConnectionPortsAsRunning(entity);
log.info("Reusable flow. Successfully marked the ports as running.");
}
newProcessGroup = new NifiProcessGroup(entity, input, nonInputProcessors);
if (isCreateReusableFlow()) {
//call listeners notify of before mark as running processing
if (creationCallback != null) {
try {
creationCallback.beforeMarkAsRunning(template.getName(), entity);
} catch (Exception e) {
log.error("Error calling callback beforeMarkAsRunning ", e);
}
}
log.info("Reusable flow, attempt to mark the Processors as running.");
templateCreationHelper.markProcessorsAsRunning(newProcessGroup);
log.info("Reusable flow. Successfully marked the Processors as running.");
//align items
AlignProcessGroupComponents alignProcessGroupComponents = new AlignProcessGroupComponents(restClient.getNiFiRestClient(), entity.getParentGroupId());
alignProcessGroupComponents.autoLayout();
}
templateCreationHelper.cleanupControllerServices();
log.info("Controller service cleanup complete");
List<NifiError> errors = templateCreationHelper.getErrors();
//add any global errors to the object
if (errors != null && !errors.isEmpty()) {
for (NifiError error : errors) {
newProcessGroup.addError(error);
}
}
newProcessGroup.setSuccess(!newProcessGroup.hasFatalErrors());
log.info("Finished importing template Errors found. Success: {}, {} {}", newProcessGroup.isSuccess(), (errors != null ? errors.size() : 0),
(errors != null ? " - " + StringUtils.join(errors) : ""));
return newProcessGroup;
}
}
} catch (final Exception e) {
if (log.isDebugEnabled() && e instanceof WebApplicationException) {
final Response response = ((WebApplicationException) e).getResponse();
log.debug("NiFi server returned error: {}", response.readEntity(String.class), e);
}
throw new TemplateCreationException("Unable to create the template for the Id of [" + templateId + "]. " + e.getMessage(), e);
}
return null;
}
}