package com.thinkbiganalytics.nifi.rest.support;
/*-
* #%L
* thinkbig-nifi-rest-common-util
* %%
* 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.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
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 java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
/**
* Utility class to gather Processor information from NiFi dto objects
*/
public class NifiProcessUtil {
/**
* Type of the cleanup processor
*/
public static String CLEANUP_TYPE = "com.thinkbiganalytics.nifi.v2.metadata.TriggerCleanup";
public static String TRIGGER_FEED_TYPE = "com.thinkbiganalytics.nifi.v2.metadata.TriggerFeed";
/**
* Return processors matching a supplied processor type matching {@link ProcessorDTO#getType()} against the supplied {@code type}
*
* @param processors a collection of processors
* @param type a type to match against
* @return a list of processors that are of the supplied type
*/
public static List<ProcessorDTO> findProcessorsByType(Collection<ProcessorDTO> processors, String type) {
Predicate<ProcessorDTO> byType = new ProcessorByTypePredicate(type);
return Lists.newArrayList(Iterables.filter(processors, byType));
}
/**
* Return the first processor that matches a supplied type {@link ProcessorDTO#getType()}
*
* @param processors a collection of processors
* @param type a processor type
* @return the first processor in the collection matching the supplied type, or null if not found
*/
public static ProcessorDTO findFirstProcessorsByType(Collection<ProcessorDTO> processors, String type) {
if (type != null) {
List<ProcessorDTO> list = findProcessorsByType(processors, type);
if (list != null && !list.isEmpty()) {
return list.get(0);
}
}
return null;
}
/**
* Return the list of processors that match a given name
*
* @param processors a collection of processors
* @param name a name to match
* @return a list of processors with the supplied name
*/
public static List<ProcessorDTO> findProcessorsByName(Collection<ProcessorDTO> processors, String name) {
Predicate<ProcessorDTO> byName = new ProcessorByNamePredicate(name);
return Lists.newArrayList(Iterables.filter(processors, byName));
}
/**
* Return the first processor in the collection with the supplied name
*
* @param processors a collection of processors
* @param name the name to match
* @return a processor with the name, or null if not found
*/
public static ProcessorDTO findFirstProcessorsByName(Collection<ProcessorDTO> processors, String name) {
List<ProcessorDTO> list = findProcessorsByName(processors, name);
if (list != null && !list.isEmpty()) {
return list.get(0);
}
return null;
}
/**
* Return a list of processors matching a given id
*
* @param processors a collection of processors
* @param id an id to match
* @return a list of processors with the supplied id
*/
public static List<ProcessorDTO> findProcessorsById(Collection<ProcessorDTO> processors, String id) {
Predicate<ProcessorDTO> byId = new ProcessorByIdPredicate(id);
return Lists.newArrayList(Iterables.filter(processors, byId));
}
/**
* Return the first processor in the collection that matches the supplied id
*
* @param processors a collection of processors
* @param id an id to match
* @return the first processor in the collection matching the id
*/
public static ProcessorDTO findFirstProcessorsById(Collection<ProcessorDTO> processors, String id) {
List<ProcessorDTO> list = findProcessorsById(processors, id);
if (list != null && !list.isEmpty()) {
return list.get(0);
}
return null;
}
/**
* Return processors matching a list of ids
*
* @param processors a collection of processors
* @param ids a list of ids to match
* @return a list of processors that have an id in the supplied {@code ids} list
*/
public static List<ProcessorDTO> findProcessorsByIds(Collection<ProcessorDTO> processors, List<String> ids) {
Predicate<ProcessorDTO> byIds = new ProcessorByIdsPredicate(ids);
return Lists.newArrayList(Iterables.filter(processors, byIds));
}
/**
* Return a set of processors for a given template
*
* @param template a template to parse
* @return a set of processors in that template
*/
public static Set<ProcessorDTO> getProcessors(TemplateDTO template) {
return getProcessors(template, false);
}
/**
* Return a set of processors in a template, optionally allowing the framework to traverse into a templates input ports to get the connecting process groups
*
* @param template a template to parse
* @param excludeInputs {@code true} will traverse down into the input ports and gather processors in the conencting groups, {@code false} will traverse input ports and their respective process
* groups
* @return return a set of processors
*/
public static Set<ProcessorDTO> getProcessors(TemplateDTO template, boolean excludeInputs) {
Set<ProcessorDTO> processors = new HashSet<>();
for (ProcessorDTO processorDTO : template.getSnippet().getProcessors()) {
processors.add(processorDTO);
}
if (template.getSnippet().getProcessGroups() != null) {
for (ProcessGroupDTO groupDTO : template.getSnippet().getProcessGroups()) {
processors.addAll(getProcessors(groupDTO));
}
}
if (excludeInputs) {
final List<ProcessorDTO> inputs = NifiTemplateUtil.getInputProcessorsForTemplate(template);
Iterables.removeIf(processors, new Predicate<ProcessorDTO>() {
@Override
public boolean apply(ProcessorDTO processorDTO) {
return (inputs.contains(processorDTO));
}
});
}
return processors;
}
/**
* Return all process groups in a template
*
* @param template a template to parse
* @return a collection of all process groups in the template
*/
public static Collection<ProcessGroupDTO> getProcessGroups(TemplateDTO template) {
return getProcessGroupsMap(template).values();
}
/**
* Return a map of processGroupId to process group
*
* @param template a template to parse
* @return a map of processGroupId to process group
*/
public static Map<String, ProcessGroupDTO> getProcessGroupsMap(TemplateDTO template) {
Map<String, ProcessGroupDTO> groups = new HashMap<>();
if (template.getSnippet().getProcessGroups() != null) {
for (ProcessGroupDTO groupDTO : template.getSnippet().getProcessGroups()) {
groups.putAll(getProcessGroupsMap(groupDTO));
}
}
return groups;
}
/**
* Return all the process groups under a given process group (including all their children)
*
* @param group a process group
* @return a collection of all the groups and their children
*/
public static Collection<ProcessGroupDTO> getProcessGroups(ProcessGroupDTO group) {
return getProcessGroupsMap(group).values();
}
/**
* Return a map of the process group and their children
*
* @param group a process group
* @return a map of the process group and their children
*/
private static Map<String, ProcessGroupDTO> getProcessGroupsMap(ProcessGroupDTO group) {
Map<String, ProcessGroupDTO> groups = new HashMap<>();
groups.put(group.getId(), group);
if (group.getContents() != null && group.getContents().getProcessGroups() != null) {
for (ProcessGroupDTO groupDTO : group.getContents().getProcessGroups()) {
groups.putAll(getProcessGroupsMap(groupDTO));
}
}
return groups;
}
/**
* Return a map of all the processors, by processorId under a process group, including all children
*
* @param group a process group
* @return a map of all processors in the group, including all child process groups
*/
public static Map<String, ProcessorDTO> getProcessorsMap(ProcessGroupDTO group) {
Map<String, ProcessorDTO> processors = new HashMap<>();
if (group != null) {
if(group.getContents() != null) {
for (ProcessorDTO processorDTO : group.getContents().getProcessors()) {
processors.put(processorDTO.getId(), processorDTO);
}
if (group.getContents().getProcessGroups() != null) {
for (ProcessGroupDTO groupDTO : group.getContents().getProcessGroups()) {
processors.putAll(getProcessorsMap(groupDTO));
}
}
}
}
return processors;
}
/**
* Return a collection of all processors, including all children, in a process group
*
* @param group a process group
* @return a collection of all processors, including all children, in a process group
*/
public static Collection<ProcessorDTO> getProcessors(ProcessGroupDTO group) {
return getProcessorsMap(group).values();
}
/**
* Return a list of all the first level input/source processors in a process group. These processors dont have any connection incoming to them
*
* @param group a process group
* @return a list of input processors
*/
public static List<ProcessorDTO> getInputProcessors(ProcessGroupDTO group) {
List<ProcessorDTO> processors = new ArrayList<>();
List<String> processorIds = NifiConnectionUtil.getInputProcessorIds(group.getContents().getConnections());
Map<String, ProcessorDTO> map = new HashMap<>();
if (group.getContents() != null && group.getContents().getProcessors() != null) {
for (ProcessorDTO processor : group.getContents().getProcessors()) {
map.put(processor.getId(), processor);
}
}
for (String processorId : processorIds) {
if (map.containsKey(processorId)) {
processors.add(map.get(processorId));
}
}
return processors;
}
/**
* Return a list of all processors under a process group that have connections coming into them.
*
* @param group a process group
* @return a list of all processors under a process group that have connections coming into them
*/
public static List<ProcessorDTO> getNonInputProcessors(ProcessGroupDTO group) {
List<ProcessorDTO> processors = new ArrayList<>();
final List<ProcessorDTO> inputProcessors = getInputProcessors(group);
if (group.getContents().getProcessors() != null) {
processors = Lists.newArrayList(Iterables.filter(group.getContents().getProcessors(), new Predicate<ProcessorDTO>() {
@Override
public boolean apply(ProcessorDTO processorDTO) {
return !inputProcessors.contains(processorDTO);
}
}));
}
if (group.getContents().getProcessGroups() != null) {
for (ProcessGroupDTO groupDTO : group.getContents().getProcessGroups()) {
processors.addAll(getNonInputProcessors(groupDTO));
}
}
return processors;
}
/**
* Finds the first process group with the specified name.
*
* @param processGroups the list of process groups to filter
* @param name the feed system name to match, case-insensitive
* @return the matching process group, or {@code null} if not found
*/
@Nullable
public static ProcessGroupDTO findFirstProcessGroupByName(@Nonnull final Collection<ProcessGroupDTO> processGroups, @Nonnull final String name) {
return processGroups.stream().filter(processGroup -> processGroup.getName().equalsIgnoreCase(name)).findAny().orElse(null);
}
/**
* Filters the specified list of process groups for ones matching the specified feed name, including versioned process groups.
*
* @param processGroups the list of process groups to filter
* @param feedName the feed system name to match, case-insensitive
* @return the matching process groups
*/
@Nonnull
public static Set<ProcessGroupDTO> findProcessGroupsByFeedName(@Nonnull final Collection<ProcessGroupDTO> processGroups, @Nonnull final String feedName) {
Pattern pattern = Pattern.compile("^" + Pattern.quote(feedName) + "( - \\d+)?$", Pattern.CASE_INSENSITIVE);
return processGroups.stream().filter(processGroup -> pattern.matcher(processGroup.getName()).matches()).collect(Collectors.toSet());
}
/**
* common state of NiFi processors/components
**/
public static enum PROCESS_STATE {
RUNNING, STOPPED, DISABLED, ENABLED;
}
/**
* common state of NiFi controller services
**/
public static enum SERVICE_STATE {
ENABLING, ENABLED, DISABLED;
}
/**
* Find a processor by its type
*/
private static class ProcessorByTypePredicate implements Predicate<ProcessorDTO> {
private String type;
public ProcessorByTypePredicate(String type) {
this.type = type;
}
@Override
public boolean apply(ProcessorDTO processorDTO) {
return processorDTO.getType().equalsIgnoreCase(type);
}
}
/**
* find a processor by its name
*/
private static class ProcessorByNamePredicate implements Predicate<ProcessorDTO> {
private String name;
public ProcessorByNamePredicate(String name) {
this.name = name;
}
@Override
public boolean apply(ProcessorDTO processorDTO) {
return processorDTO.getName().equalsIgnoreCase(name);
}
}
/**
* find a processor by its id
*/
private static class ProcessorByIdPredicate implements Predicate<ProcessorDTO> {
private String id;
public ProcessorByIdPredicate(String id) {
this.id = id;
}
@Override
public boolean apply(ProcessorDTO processorDTO) {
return processorDTO.getId().equalsIgnoreCase(id);
}
}
/**
* find a processor by a set of ids
*/
private static class ProcessorByIdsPredicate implements Predicate<ProcessorDTO> {
private List<String> ids;
public ProcessorByIdsPredicate(List<String> ids) {
this.ids = ids;
}
@Override
public boolean apply(ProcessorDTO processorDTO) {
return ids.contains(processorDTO.getId());
}
}
}