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/*
* Copyright (C) 2020 Graylog, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* .
*/
package org.graylog.scheduler;
import com.github.joschi.jadconfig.util.Duration;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Sets;
import com.mongodb.BasicDBObject;
import one.util.streamex.StreamEx;
import org.bson.types.ObjectId;
import org.graylog.scheduler.capabilities.SchedulerCapabilitiesService;
import org.graylog.scheduler.clock.JobSchedulerClock;
import org.graylog.scheduler.schedule.OnceJobSchedule;
import org.graylog2.bindings.providers.MongoJackObjectMapperProvider;
import org.graylog2.database.MongoConnection;
import org.graylog2.plugin.system.NodeId;
import org.graylog2.shared.utilities.MongoQueryUtils;
import org.joda.time.DateTime;
import org.mongojack.DBCursor;
import org.mongojack.DBQuery;
import org.mongojack.DBQuery.Query;
import org.mongojack.DBSort;
import org.mongojack.DBUpdate;
import org.mongojack.JacksonDBCollection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Inject;
import javax.inject.Named;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
import static com.google.common.base.Strings.isNullOrEmpty;
import static java.util.Objects.requireNonNull;
import static org.graylog.scheduler.JobSchedulerConfiguration.LOCK_EXPIRATION_DURATION;
// This class does NOT use PaginatedDbService because we use the triggers collection for locking and need to handle
// updates very carefully.
public class DBJobTriggerService {
private final static Logger LOG = LoggerFactory.getLogger(DBJobTriggerService.class);
public static final String COLLECTION_NAME = "scheduler_triggers";
private static final String FIELD_ID = "_id";
static final String FIELD_JOB_DEFINITION_ID = JobTriggerDto.FIELD_JOB_DEFINITION_ID;
private static final String FIELD_LOCK_OWNER = JobTriggerDto.FIELD_LOCK + "." + JobTriggerLock.FIELD_OWNER;
private static final String FIELD_LAST_LOCK_OWNER = JobTriggerDto.FIELD_LOCK + "." + JobTriggerLock.FIELD_LAST_OWNER;
private static final String FIELD_PROGRESS = JobTriggerDto.FIELD_LOCK + "." + JobTriggerLock.FIELD_PROGRESS;
private static final String FIELD_LAST_LOCK_TIME = JobTriggerDto.FIELD_LOCK + "." + JobTriggerLock.FIELD_LAST_LOCK_TIME;
private static final String FIELD_NEXT_TIME = JobTriggerDto.FIELD_NEXT_TIME;
private static final String FIELD_START_TIME = JobTriggerDto.FIELD_START_TIME;
private static final String FIELD_END_TIME = JobTriggerDto.FIELD_END_TIME;
private static final String FIELD_STATUS = JobTriggerDto.FIELD_STATUS;
private static final String FIELD_SCHEDULE = JobTriggerDto.FIELD_SCHEDULE;
private static final String FIELD_DATA = JobTriggerDto.FIELD_DATA;
private static final String FIELD_UPDATED_AT = JobTriggerDto.FIELD_UPDATED_AT;
private static final String FIELD_TRIGGERED_AT = JobTriggerDto.FIELD_TRIGGERED_AT;
private static final String FIELD_CONSTRAINTS = JobTriggerDto.FIELD_CONSTRAINTS;
private static final String FIELD_JOB_DEFINITION_TYPE = JobTriggerDto.FIELD_JOB_DEFINITION_TYPE;
private final String nodeId;
private final JacksonDBCollection db;
private final JobSchedulerClock clock;
private final SchedulerCapabilitiesService schedulerCapabilitiesService;
private final Duration lockExpirationDuration;
@Inject
public DBJobTriggerService(MongoConnection mongoConnection,
MongoJackObjectMapperProvider mapper,
NodeId nodeId,
JobSchedulerClock clock,
SchedulerCapabilitiesService schedulerCapabilitiesService,
@Named(LOCK_EXPIRATION_DURATION) Duration lockExpirationDuration) {
this.nodeId = nodeId.toString();
this.clock = clock;
this.schedulerCapabilitiesService = schedulerCapabilitiesService;
this.lockExpirationDuration = lockExpirationDuration;
this.db = JacksonDBCollection.wrap(mongoConnection.getDatabase().getCollection(COLLECTION_NAME),
JobTriggerDto.class,
ObjectId.class,
mapper.get());
db.createIndex(new BasicDBObject(FIELD_JOB_DEFINITION_ID, 1));
db.createIndex(new BasicDBObject(FIELD_LOCK_OWNER, 1));
db.createIndex(new BasicDBObject(FIELD_STATUS, 1));
db.createIndex(new BasicDBObject(FIELD_START_TIME, 1));
db.createIndex(new BasicDBObject(FIELD_END_TIME, 1));
db.createIndex(new BasicDBObject(FIELD_NEXT_TIME, 1));
db.createIndex(new BasicDBObject(FIELD_CONSTRAINTS, 1));
db.createIndex(new BasicDBObject(FIELD_JOB_DEFINITION_TYPE, 1));
}
/**
* Loads all existing records and returns them.
*
* @return list of records
*/
public List all() {
return ImmutableList.copyOf(db.find().sort(DBSort.desc(FIELD_ID)).iterator());
}
/**
* Loads the record for the given ID.
*
* @param id record ID to load
* @return filled optional when the record exists, an empty optional otherwise
*/
public Optional get(String id) {
return Optional.ofNullable(db.findOneById(new ObjectId(id)));
}
/**
* Returns one trigger for the given job definition ID.
*
* TODO: Don't throw exception when there is more than one trigger for a job definition. (see source code)
*
* @param jobDefinitionId the job definition ID
* @return One found job trigger
*/
public Optional getOneForJob(String jobDefinitionId) {
final List triggers = getAllForJob(jobDefinitionId);
// We are currently expecting only one trigger per job definition. This will most probably change in the
// future once we extend our scheduler usage.
// TODO: Don't throw exception when there is more than one trigger for a job definition.
// To be able to do this, we need some kind of label system to make sure we can differentiate between
// automatically created triggers (e.g. by event definition) and manually created ones.
if (triggers.size() > 1) {
throw new IllegalStateException("More than one trigger for job definition <" + jobDefinitionId + ">");
}
return triggers.stream().findFirst();
}
public List getAllForJob(String jobDefinitionId) {
if (isNullOrEmpty(jobDefinitionId)) {
throw new IllegalArgumentException("jobDefinitionId cannot be null or empty");
}
final Query query = DBQuery.is(FIELD_JOB_DEFINITION_ID, jobDefinitionId);
try (final DBCursor cursor = db.find(query)) {
return ImmutableList.copyOf(cursor.iterator());
}
}
/**
* Returns all job triggers for the given job definition IDs, grouped by job definition ID.
*
* TODO: Don't throw exception when there is more than one trigger for a job definition. (see source code)
*
* @param jobDefinitionIds the job definition IDs
* @return list of found job triggers
*/
public Map> getForJobs(Collection jobDefinitionIds) {
if (jobDefinitionIds == null) {
throw new IllegalArgumentException("jobDefinitionIds cannot be null");
}
final Set queryValues = jobDefinitionIds.stream()
.filter(Objects::nonNull)
.filter(id -> !isNullOrEmpty(id))
.collect(Collectors.toSet());
final Query query = DBQuery.in(FIELD_JOB_DEFINITION_ID, queryValues);
final Map> groupedTriggers = StreamEx.of(db.find(query).toArray())
.groupingBy(JobTriggerDto::jobDefinitionId);
// We are currently expecting only one trigger per job definition. This will most probably change in the
// future once we extend our scheduler usage.
// TODO: Don't throw exception when there is more than one trigger for a job definition.
// To be able to do this, we need some kind of label system to make sure we can differentiate between
// automatically created triggers (e.g. by event definition) and manually created ones.
for (Map.Entry> entry : groupedTriggers.entrySet()) {
if (entry.getValue().size() > 1) {
throw new IllegalStateException("More than one trigger for job definition <" + entry.getKey() + ">");
}
}
return groupedTriggers;
}
/**
* Creates a new record in the database. The given {@link JobTriggerDto} object must not have an ID to make
* sure a new record is created.
*
* @param trigger the new trigger object (without an ID set)
* @return the newly created trigger object
* @throws IllegalArgumentException if the passed trigger has an ID set
*/
public JobTriggerDto create(JobTriggerDto trigger) {
requireNonNull(trigger, "trigger cannot be null");
// Make sure we don't save triggers that have an ID. That would potentially overwrite an existing trigger
// and destroy locks and other data.
if (trigger.id() != null) {
throw new IllegalArgumentException("New trigger must not have an ID");
}
return db.insert(trigger).getSavedObject();
}
/**
* Updates the given trigger record in the database. This method takes care of not overwriting any locks and
* state data with the update.
*
* @param trigger the trigger to update
* @return true when the update was successful, false otherwise
* @throws IllegalArgumentException if the passed trigger doesn't have an ID set
*/
public boolean update(JobTriggerDto trigger) {
requireNonNull(trigger, "trigger cannot be null");
// Make sure we don't update triggers that don't have an ID. This would create a new record instead of updating
// an existing one.
if (isNullOrEmpty(trigger.id())) {
throw new IllegalArgumentException("Trigger must have an ID");
}
// We don't want to allow updating all fields of the trigger. That's why we can't just use "save(JobTriggerDto)"
// because that would overwrite fields like "lock" and others we don't want to update.
final DBUpdate.Builder update = DBUpdate
.set(FIELD_START_TIME, trigger.startTime())
.set(FIELD_NEXT_TIME, trigger.nextTime())
.set(FIELD_DATA, trigger.data())
.set(FIELD_UPDATED_AT, clock.nowUTC());
if (trigger.endTime().isPresent()) {
update.set(FIELD_END_TIME, trigger.endTime());
}
// We cannot just use "update.set(FIELD_SCHEDULE, trigger.schedule()" to update the trigger because mongojack
// has an issue with serializing polymorphic classes and "$set": https://github.com/mongojack/mongojack/issues/101
// That's why JobSchedule objects have the "toDBUpdate()" method to give us all fields for the specific
// schedule implementation. (the fields can be different, depending on the schedule type)
final Optional> scheduleUpdate = trigger.schedule().toDBUpdate(FIELD_SCHEDULE + ".");
if (scheduleUpdate.isPresent()) {
// First load the old trigger so we can compare the scheduler config keys.
final JobTriggerDto oldTrigger = get(trigger.id())
.orElseThrow(() -> new IllegalStateException("Couldn't find trigger with ID " + trigger.id()));
// Compute old and new schedule config keys
final Set oldKeys = oldTrigger.schedule().toDBUpdate(FIELD_SCHEDULE + ".")
.orElse(new HashMap<>()).keySet();
final Set newKeys = scheduleUpdate.get().keySet();
// Find out which keys aren't present in the new schedule config.
final Sets.SetView toUnset = Sets.difference(oldKeys, newKeys);
// Remove keys which aren't present in the new schedule config. Otherwise we would have old keys in there
// which cannot be parsed for the updated schedule type.
toUnset.forEach(update::unset);
// Then we can set the specific fields.
scheduleUpdate.get().forEach(update::set);
}
return db.update(DBQuery.is(FIELD_ID, getId(trigger)), update).getN() > 0;
}
/**
* Deletes the trigger with the given ID.
*
* @param triggerId the trigger ID to delete
* @return true if the trigger got deleted, false otherwise
*/
public boolean delete(String triggerId) {
if (isNullOrEmpty(triggerId)) {
throw new IllegalArgumentException("triggerId cannot be null or empty");
}
return db.remove(DBQuery.is(FIELD_ID, triggerId)).getN() > 0;
}
/**
* Deletes completed / cancelled {@link OnceJobSchedule} triggers that are older than the provided time
*
* @param timeValue the time range of triggers to be removed
* @param unit the unit of the provided timeValue
* @return the number of deleted triggers
*/
public int deleteCompletedOnceSchedulesOlderThan(long timeValue, TimeUnit unit) {
final Query query = DBQuery.and(
DBQuery.is(FIELD_LOCK_OWNER, null),
DBQuery.or(
DBQuery.is(FIELD_STATUS, JobTriggerStatus.COMPLETE),
DBQuery.is(FIELD_STATUS, JobTriggerStatus.CANCELLED)
),
DBQuery.is(FIELD_SCHEDULE + "." + JobSchedule.TYPE_FIELD, OnceJobSchedule.TYPE_NAME),
DBQuery.lessThan(FIELD_UPDATED_AT, clock.nowUTC().minus(unit.toMillis(timeValue)))
);
return db.remove(query).getN();
}
/**
* Deletes job triggers using the given query. Use judiciously, as will make assumptions about the
* internal data structure of triggers.
*/
public int deleteByQuery(Query query) {
return db.remove(query).getN();
}
public long countByQuery(Query query) {
return db.getCount(query);
}
/**
* Locks and returns the next runnable trigger. The caller needs to take care of releasing the trigger lock.
*
* @return next runnable trigger if any exists, an empty {@link Optional} otherwise
*/
public Optional nextRunnableTrigger() {
final DateTime now = clock.nowUTC();
final Query constraintsQuery = MongoQueryUtils.getArrayIsContainedQuery(FIELD_CONSTRAINTS, schedulerCapabilitiesService.getNodeCapabilities());
final Query query = DBQuery.or(DBQuery.and(
// We cannot lock a trigger that is already locked by another node
DBQuery.is(FIELD_LOCK_OWNER, null),
DBQuery.is(FIELD_STATUS, JobTriggerStatus.RUNNABLE),
DBQuery.lessThanEquals(FIELD_START_TIME, now),
constraintsQuery,
DBQuery.or( // Skip triggers that have an endTime which is due
DBQuery.notExists(FIELD_END_TIME),
DBQuery.is(FIELD_END_TIME, null),
DBQuery.greaterThan(FIELD_END_TIME, Optional.of(now))
),
// TODO: Using the wall clock time here can be problematic if the node time is off
// The scheduler should not lock any new triggers if it detects that its clock is wrong
DBQuery.lessThanEquals(FIELD_NEXT_TIME, now)
), DBQuery.and(
DBQuery.notEquals(FIELD_LOCK_OWNER, null),
DBQuery.notEquals(FIELD_LOCK_OWNER, nodeId),
DBQuery.is(FIELD_STATUS, JobTriggerStatus.RUNNING),
constraintsQuery,
DBQuery.lessThan(FIELD_LAST_LOCK_TIME, now.minus(lockExpirationDuration.toMilliseconds())))
);
// We want to lock the trigger with the oldest next time
final DBSort.SortBuilder sort = DBSort.asc(FIELD_NEXT_TIME);
final DBUpdate.Builder lockUpdate = DBUpdate.set(FIELD_LOCK_OWNER, nodeId)
.set(FIELD_LAST_LOCK_OWNER, nodeId)
.set(FIELD_STATUS, JobTriggerStatus.RUNNING)
.set(FIELD_TRIGGERED_AT, Optional.of(now))
.set(FIELD_LAST_LOCK_TIME, now);
// Atomically update, lock and return the next runnable trigger
final JobTriggerDto trigger = db.findAndModify(
query,
null,
sort,
false,
lockUpdate,
true, // We need the modified object so we have access to the lock information
false
);
return Optional.ofNullable(trigger);
}
/**
* Releases a locked trigger. The trigger is only released if it's owned by the calling node.
*
* @param trigger trigger that should be released
* @param triggerUpdate update to apply to the trigger
* @return true if the trigger has been modified, false otherwise
*/
public boolean releaseTrigger(JobTriggerDto trigger, JobTriggerUpdate triggerUpdate) {
requireNonNull(trigger, "trigger cannot be null");
requireNonNull(triggerUpdate, "triggerUpdate cannot be null");
final Query query = DBQuery.and(
// Make sure that the owner still owns the trigger
DBQuery.is(FIELD_LOCK_OWNER, nodeId),
DBQuery.is(FIELD_ID, getId(trigger)),
// Only release running triggers. The trigger might have been paused while the trigger was running
// so we don't want to set it to RUNNABLE again.
// TODO: This is an issue. If a user set it to PAUSED, we will not unlock it. Figure something out.
// Maybe a manual trigger pause will set "nextStatus" if the trigger is currently running?
// That next status would need to be set on release.
DBQuery.is(FIELD_STATUS, JobTriggerStatus.RUNNING)
);
final DBUpdate.Builder update = DBUpdate.set(FIELD_LOCK_OWNER, null);
// An empty next time indicates that this trigger should not be fired anymore. (e.g. for "once" schedules)
if (triggerUpdate.nextTime().isPresent()) {
if (triggerUpdate.status().isPresent()) {
update.set(FIELD_STATUS, triggerUpdate.status().get());
} else {
update.set(FIELD_STATUS, JobTriggerStatus.RUNNABLE);
}
update.set(FIELD_NEXT_TIME, triggerUpdate.nextTime().get());
} else {
update.set(FIELD_STATUS, triggerUpdate.status().orElse(JobTriggerStatus.COMPLETE));
}
if (triggerUpdate.data().isPresent()) {
update.set(FIELD_DATA, triggerUpdate.data());
}
final int changedDocs = db.update(query, update).getN();
if (changedDocs > 1) {
throw new IllegalStateException("Expected to release only one trigger (id=" + trigger.id() + ") but database query modified " + changedDocs);
}
return changedDocs == 1;
}
/**
* WARNING: This should only be called before the job scheduler is started! Calling this
* while the scheduler is running might result in data corruption or inconsistencies!
*
* This method will release all triggers that are locked by the calling node. It should be called before starting
* the scheduler service on the current node to release all triggers that might be in a stale
* {@link JobTriggerStatus#RUNNING RUNNING} status after an unclean JVM or Graylog server shutdown.
*
* @return number of released triggers
*/
public int forceReleaseOwnedTriggers() {
final Query query = DBQuery.and(
// Only select trigger for force release which are owned by the calling node
DBQuery.is(FIELD_LOCK_OWNER, nodeId),
DBQuery.is(FIELD_STATUS, JobTriggerStatus.RUNNING)
);
final DBUpdate.Builder update = DBUpdate.set(FIELD_LOCK_OWNER, null)
.set(FIELD_STATUS, JobTriggerStatus.RUNNABLE);
return db.updateMulti(query, update).getN();
}
/**
* Mark the given trigger as defective to make sure it will not be scheduled anymore.
*
* @param trigger trigger that should be marked as defective
* @return true if the trigger has been modified, false otherwise
*/
public boolean setTriggerError(JobTriggerDto trigger) {
requireNonNull(trigger, "trigger cannot be null");
final Query query = DBQuery.and(
// Make sure that the owner still owns the trigger
DBQuery.is(FIELD_LOCK_OWNER, nodeId),
DBQuery.is(FIELD_ID, getId(trigger))
);
final DBUpdate.Builder update = DBUpdate.set(FIELD_LOCK_OWNER, null)
.set(FIELD_STATUS, JobTriggerStatus.ERROR);
return db.update(query, update).getN() > 0;
}
private ObjectId getId(JobTriggerDto trigger) {
return new ObjectId(requireNonNull(trigger.id(), "trigger ID cannot be null"));
}
public void updateLockedJobTriggers() {
final DateTime now = clock.nowUTC();
Query query = DBQuery.and(
DBQuery.is(FIELD_LOCK_OWNER, nodeId),
DBQuery.is(FIELD_STATUS, JobTriggerStatus.RUNNING)
);
DBUpdate.Builder update = DBUpdate.set(FIELD_LAST_LOCK_TIME, now);
db.updateMulti(query, update);
}
/**
* Update the job progress on a trigger
* @param trigger the trigger to update
* @param progress the job progress in percent (0-100)
*/
public int updateProgress(JobTriggerDto trigger, int progress) {
final Query query = DBQuery.is(FIELD_ID, trigger.id());
final DBUpdate.Builder update = DBUpdate.set(FIELD_PROGRESS, progress);
return db.update(query, update).getN();
}
/**
* Cancel a JobTrigger that matches a query
* @param query the db query
* @return an Optional of the trigger that was cancelled. Empty if no matching trigger was found.
*/
public Optional cancelTriggerByQuery(Query query) {
final DBUpdate.Builder update = DBUpdate.set(JobTriggerDto.FIELD_IS_CANCELLED, true);
return Optional.ofNullable(db.findAndModify(query, update));
}
/**
* Find triggers by using the provided query. Use judiciously!
* @param query The query
* @return All found JobTriggers
*/
public List findByQuery(Query query) {
try (final DBCursor cursor = db.find(query).sort(DBSort.desc(FIELD_UPDATED_AT))) {
return ImmutableList.copyOf((Iterator) cursor);
}
}
}
