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/**
* This file is part of Graylog.
*
* Graylog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog. If not, see .
*/
package org.graylog.events.processor;
import org.graylog.scheduler.DBJobDefinitionService;
import org.graylog.scheduler.DBJobTriggerService;
import org.graylog.scheduler.JobDefinitionDto;
import org.graylog.scheduler.JobTriggerDto;
import org.graylog.scheduler.clock.JobSchedulerClock;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Inject;
import java.util.List;
import java.util.Optional;
import static java.util.Objects.requireNonNull;
/**
* Handles event definitions and creates scheduler job definitions and job triggers.
*
* Caveat: These handlers modify different database documents without using any transactions. That means we can
* run into concurrency issues and partial operations.
*
* TODO: Make use of transactions once our database library supports it
*/
public class EventDefinitionHandler {
private static final Logger LOG = LoggerFactory.getLogger(EventDefinitionHandler.class);
private final DBEventDefinitionService eventDefinitionService;
private final DBJobDefinitionService jobDefinitionService;
private final DBJobTriggerService jobTriggerService;
private final JobSchedulerClock clock;
@Inject
public EventDefinitionHandler(DBEventDefinitionService eventDefinitionService,
DBJobDefinitionService jobDefinitionService,
DBJobTriggerService jobTriggerService,
JobSchedulerClock clock) {
this.eventDefinitionService = eventDefinitionService;
this.jobDefinitionService = jobDefinitionService;
this.jobTriggerService = jobTriggerService;
this.clock = clock;
}
/**
* Creates a new event definition and a corresponding scheduler job definition and trigger.
*
* @param unsavedEventDefinition the event definition to save
* @return the created event definition
*/
public EventDefinitionDto create(EventDefinitionDto unsavedEventDefinition) {
final EventDefinitionDto eventDefinition = createEventDefinition(unsavedEventDefinition);
try {
createJobDefinitionAndTriggerIfScheduledType(eventDefinition);
} catch (Exception e) {
// Cleanup if anything goes wrong
LOG.error("Removing event definition <{}/{}> because of an error creating the job definition",
eventDefinition.id(), eventDefinition.title(), e);
eventDefinitionService.delete(eventDefinition.id());
throw e;
}
return eventDefinition;
}
/**
* Creates a new event definition without scheduling it. Normally the {@link #create(EventDefinitionDto)} method
* should be used to ensure proper scheduling of the event definition. In some cases new event definitions
* must be created without a schedule, though. (e.g. content packs)
*
* @param unsavedEventDefinition the event definition to save
* @return the created event definition
*/
public EventDefinitionDto createWithoutSchedule(EventDefinitionDto unsavedEventDefinition) {
return createEventDefinition(unsavedEventDefinition);
}
/**
* Updates an existing event definition and its corresponding scheduler job definition and trigger.
*
* @param updatedEventDefinition the event definition to update
* @return the updated event definition
*/
public EventDefinitionDto update(EventDefinitionDto updatedEventDefinition, boolean schedule) {
// Grab the old record so we can revert to it if something goes wrong
final Optional oldEventDefinition = eventDefinitionService.get(updatedEventDefinition.id());
final EventDefinitionDto eventDefinition = updateEventDefinition(updatedEventDefinition);
try {
if (schedule) {
if (getJobDefinition(eventDefinition).isPresent()) {
updateJobDefinitionAndTriggerIfScheduledType(eventDefinition);
} else {
createJobDefinitionAndTriggerIfScheduledType(eventDefinition);
}
} else {
unschedule(eventDefinition.id());
}
} catch (Exception e) {
// Cleanup if anything goes wrong
LOG.error("Reverting to old event definition <{}/{}> because of an error updating the job definition",
eventDefinition.id(), eventDefinition.title(), e);
oldEventDefinition.ifPresent(eventDefinitionService::save);
throw e;
}
return eventDefinition;
}
/**
* Deletes an existing event definition and its corresponding scheduler job definition and trigger.
*
* @param eventDefinitionId the event definition to delete
* @return true if the event definition got deleted, false otherwise
*/
public boolean delete(String eventDefinitionId) {
final Optional optionalEventDefinition = eventDefinitionService.get(eventDefinitionId);
if (!optionalEventDefinition.isPresent()) {
return false;
}
final EventDefinitionDto eventDefinition = optionalEventDefinition.get();
getJobDefinition(eventDefinition)
.ifPresent(jobDefinition -> deleteJobDefinitionAndTrigger(jobDefinition, eventDefinition));
LOG.debug("Deleting event definition <{}/{}>", eventDefinition.id(), eventDefinition.title());
return eventDefinitionService.delete(eventDefinitionId) > 0;
}
/**
* Creates a job definition and a trigger to schedule the given event definition.
*
* @param eventDefinitionId the event definition to schedule
*/
public void schedule(String eventDefinitionId) {
final EventDefinitionDto eventDefinition = getEventDefinitionOrThrowIAE(eventDefinitionId);
createJobDefinitionAndTriggerIfScheduledType(eventDefinition);
}
/**
* Removes job definition and trigger for the given event definition to disable it.
*
* @param eventDefinitionId the event definition to unschedule
*/
public void unschedule(String eventDefinitionId) {
final EventDefinitionDto eventDefinition = getEventDefinitionOrThrowIAE(eventDefinitionId);
getJobDefinition(eventDefinition)
.ifPresent(jobDefinition -> deleteJobDefinitionAndTrigger(jobDefinition, eventDefinition));
}
private EventDefinitionDto createEventDefinition(EventDefinitionDto unsavedEventDefinition) {
final EventDefinitionDto eventDefinition = eventDefinitionService.save(unsavedEventDefinition);
LOG.debug("Created event definition <{}/{}>", eventDefinition.id(), eventDefinition.title());
return eventDefinition;
}
private EventDefinitionDto getEventDefinitionOrThrowIAE(String eventDefinitionId) {
return eventDefinitionService.get(eventDefinitionId)
.orElseThrow(() -> new IllegalArgumentException("Event definition <" + eventDefinitionId + "> doesn't exist"));
}
private EventDefinitionDto updateEventDefinition(EventDefinitionDto updatedEventDefinition) {
final EventDefinitionDto eventDefinition = eventDefinitionService.save(updatedEventDefinition);
LOG.debug("Updated event definition <{}/{}>", eventDefinition.id(), eventDefinition.title());
return eventDefinition;
}
private JobDefinitionDto newJobDefinition(EventDefinitionDto eventDefinition, EventProcessorSchedulerConfig schedulerConfig) {
return JobDefinitionDto.builder()
.title(eventDefinition.title())
.description(eventDefinition.description())
.config(schedulerConfig.jobDefinitionConfig())
.build();
}
private JobDefinitionDto createJobDefinition(EventDefinitionDto eventDefinition, EventProcessorSchedulerConfig schedulerConfig) {
final JobDefinitionDto jobDefinition = jobDefinitionService.save(newJobDefinition(eventDefinition, schedulerConfig));
LOG.debug("Created scheduler job definition <{}/{}> for event definition <{}/{}>", jobDefinition.id(),
jobDefinition.title(), eventDefinition.id(), eventDefinition.title());
return jobDefinition;
}
private void createJobDefinitionAndTrigger(EventDefinitionDto eventDefinition,
EventProcessorSchedulerConfig schedulerConfig) {
final JobDefinitionDto jobDefinition = createJobDefinition(eventDefinition, schedulerConfig);
try {
createJobTrigger(eventDefinition, jobDefinition, schedulerConfig);
} catch (Exception e) {
// Cleanup if anything goes wrong
LOG.error("Removing job definition <{}/{}> because of an error creating the job trigger",
jobDefinition.id(), jobDefinition.title(), e);
jobDefinitionService.delete(jobDefinition.id());
throw e;
}
}
private void createJobDefinitionAndTriggerIfScheduledType(EventDefinitionDto eventDefinition) {
getJobSchedulerConfig(eventDefinition)
.ifPresent(schedulerConfig -> createJobDefinitionAndTrigger(eventDefinition, schedulerConfig));
}
private Optional getJobDefinition(EventDefinitionDto eventDefinition) {
return jobDefinitionService.getByConfigField(EventProcessorExecutionJob.Config.FIELD_EVENT_DEFINITION_ID, eventDefinition.id());
}
private JobDefinitionDto getJobDefinitionOrThrowISE(EventDefinitionDto eventDefinition) {
return getJobDefinition(eventDefinition)
.orElseThrow(() -> new IllegalStateException("Couldn't find job definition for event definition <" + eventDefinition.id() + ">"));
}
private JobDefinitionDto updateJobDefinition(EventDefinitionDto eventDefinition,
JobDefinitionDto oldJobDefinition,
EventProcessorSchedulerConfig schedulerConfig) {
// Update the existing object to make sure we keep the ID
final JobDefinitionDto unsavedJobDefinition = oldJobDefinition.toBuilder()
.title(eventDefinition.title())
.description(eventDefinition.description())
.config(schedulerConfig.jobDefinitionConfig())
.build();
final JobDefinitionDto jobDefinition = jobDefinitionService.save(unsavedJobDefinition);
LOG.debug("Updated scheduler job definition <{}/{}> for event definition <{}/{}>", jobDefinition.id(),
jobDefinition.title(), eventDefinition.id(), eventDefinition.title());
return jobDefinition;
}
private void updateJobDefinitionAndTrigger(EventDefinitionDto eventDefinition,
EventProcessorSchedulerConfig schedulerConfig) {
// Grab the old record so we can revert to it if something goes wrong
final JobDefinitionDto oldJobDefinition = getJobDefinitionOrThrowISE(eventDefinition);
final JobDefinitionDto jobDefinition = updateJobDefinition(eventDefinition, oldJobDefinition, schedulerConfig);
try {
updateJobTrigger(eventDefinition, jobDefinition, oldJobDefinition, schedulerConfig);
} catch (Exception e) {
// Cleanup if anything goes wrong
LOG.error("Reverting to old job definition <{}/{}> because of an error updating the job trigger",
jobDefinition.id(), jobDefinition.title(), e);
jobDefinitionService.save(oldJobDefinition);
throw e;
}
}
private void updateJobDefinitionAndTriggerIfScheduledType(EventDefinitionDto eventDefinition) {
getJobSchedulerConfig(eventDefinition)
.ifPresent(schedulerConfig -> updateJobDefinitionAndTrigger(eventDefinition, schedulerConfig));
}
private void deleteJobDefinition(JobDefinitionDto jobDefinition, EventDefinitionDto eventDefinition) {
LOG.debug("Deleting job definition <{}/{}> for event definition <{}/{}>", jobDefinition.id(),
jobDefinition.title(), eventDefinition.id(), eventDefinition.title());
jobDefinitionService.delete(jobDefinition.id());
}
private void deleteJobDefinitionAndTrigger(JobDefinitionDto jobDefinition, EventDefinitionDto eventDefinition) {
deleteJobTrigger(jobDefinition, eventDefinition);
deleteJobDefinition(jobDefinition, eventDefinition);
}
private JobTriggerDto newJobTrigger(JobDefinitionDto jobDefinition, EventProcessorSchedulerConfig schedulerConfig) {
return JobTriggerDto.builderWithClock(clock)
.jobDefinitionId(requireNonNull(jobDefinition.id(), "Job definition ID cannot be null"))
.nextTime(clock.nowUTC())
.schedule(schedulerConfig.schedule())
.build();
}
private void createJobTrigger(EventDefinitionDto dto, JobDefinitionDto jobDefinition, EventProcessorSchedulerConfig schedulerConfig) {
final JobTriggerDto jobTrigger = jobTriggerService.create(newJobTrigger(jobDefinition, schedulerConfig));
LOG.debug("Created job trigger <{}> for job definition <{}/{}> and event definition <{}/{}>", jobTrigger.id(),
jobDefinition.id(), jobDefinition.title(), dto.id(), dto.title());
}
private Optional getJobTrigger(JobDefinitionDto jobDefinition) {
final List jobTriggers = jobTriggerService.getForJob(jobDefinition.id());
if (jobTriggers.isEmpty()) {
return Optional.empty();
}
// DBJobTriggerService#getForJob currently returns only one trigger. (raises an exception otherwise)
// Once we allow multiple triggers per job definition, this code will fail. We need some kind of label
// to figure out which trigger was created automatically. (e.g. event processor)
// TODO: Fix this code for multiple triggers per job definition
return Optional.ofNullable(jobTriggers.get(0));
}
private void updateJobTrigger(EventDefinitionDto eventDefinition,
JobDefinitionDto jobDefinition,
JobDefinitionDto oldJobDefinition,
EventProcessorSchedulerConfig schedulerConfig) {
final Optional optionalOldJobTrigger = getJobTrigger(jobDefinition);
if (!optionalOldJobTrigger.isPresent()) {
// Nothing to do if there are no job triggers to update
return;
}
final JobTriggerDto oldJobTrigger = optionalOldJobTrigger.get();
// Update the existing object to make sure we keep the ID
final JobTriggerDto.Builder unsavedJobTriggerBuilder = oldJobTrigger.toBuilder()
.jobDefinitionId(requireNonNull(jobDefinition.id(), "Job definition ID cannot be null"))
.schedule(schedulerConfig.schedule())
.nextTime(clock.nowUTC());
final EventProcessorExecutionJob.Config oldConfig = (EventProcessorExecutionJob.Config) oldJobDefinition.config();
final EventProcessorExecutionJob.Config config = (EventProcessorExecutionJob.Config) jobDefinition.config();
// If necessary, reset the scheduling times
if (!config.hasEqualSchedule(oldConfig)) {
// jobDefinition has a newly created scheduling timerange.
// Wipe the old one so EventProcessorExecutionJob.execute()
// will fall back to the new one from the JobDefinition.
unsavedJobTriggerBuilder.data(null);
// schedule the next execution accordingly
unsavedJobTriggerBuilder.nextTime(config.parameters().timerange().getTo());
}
final JobTriggerDto jobTrigger = unsavedJobTriggerBuilder.build();
jobTriggerService.update(jobTrigger);
LOG.debug("Updated scheduler job trigger <{}> for job definition <{}/{}> and event definition <{}/{}>",
jobTrigger.id(), jobDefinition.id(), jobDefinition.title(), eventDefinition.id(), eventDefinition.title());
}
private void deleteJobTrigger(JobDefinitionDto jobDefinition, EventDefinitionDto eventDefinition) {
final Optional optionalJobTrigger = getJobTrigger(jobDefinition);
if (!optionalJobTrigger.isPresent()) {
return;
}
final JobTriggerDto jobTrigger = optionalJobTrigger.get();
LOG.debug("Deleting scheduler job trigger <{}> for job definition <{}/{}> and event definition <{}/{}>",
jobTrigger.id(), jobDefinition.id(), jobDefinition.title(), eventDefinition.id(), eventDefinition.title());
jobTriggerService.delete(jobTrigger.id());
}
private Optional getJobSchedulerConfig(EventDefinitionDto eventDefinition) {
return eventDefinition.config().toJobSchedulerConfig(eventDefinition, clock);
}
}
