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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.dns;
import com.yahoo.transaction.Mutex;
import com.yahoo.vespa.hosted.controller.api.integration.dns.AliasTarget;
import com.yahoo.vespa.hosted.controller.api.integration.dns.DirectTarget;
import com.yahoo.vespa.hosted.controller.api.integration.dns.NameService;
import com.yahoo.vespa.hosted.controller.api.integration.dns.Record;
import com.yahoo.vespa.hosted.controller.api.integration.dns.RecordData;
import com.yahoo.vespa.hosted.controller.api.integration.dns.RecordName;
import com.yahoo.vespa.hosted.controller.application.TenantAndApplicationId;
import com.yahoo.vespa.hosted.controller.maintenance.NameServiceDispatcher;
import com.yahoo.vespa.hosted.controller.persistence.CuratorDb;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* This adds name service requests to the {@link NameServiceQueue}.
*
* Name service requests passed to this are not immediately sent to a name service, but are instead persisted
* in a curator-backed queue. Enqueued requests are later dispatched to a {@link NameService} by
* {@link NameServiceDispatcher}.
*
* @author mpolden
*/
public class NameServiceForwarder {
private static final Logger log = Logger.getLogger(NameServiceForwarder.class.getName());
private final CuratorDb db;
public NameServiceForwarder(CuratorDb db) {
this.db = Objects.requireNonNull(db, "db must be non-null");
}
/** Create or update a given record */
public void createRecord(Record record, NameServiceQueue.Priority priority, Optional<TenantAndApplicationId> owner) {
forward(new CreateRecord(owner, record), priority);
}
/** Create or update an ALIAS record with given name and targets */
public void createAlias(RecordName name, Set<AliasTarget> targets, NameServiceQueue.Priority priority, Optional<TenantAndApplicationId> owner) {
var records = targets.stream()
.map(target -> new Record(Record.Type.ALIAS, name, target.pack()))
.toList();
forward(new CreateRecords(owner, records), priority);
}
/** Create or update a DIRECT record with given name and targets */
public void createDirect(RecordName name, Set<DirectTarget> targets, NameServiceQueue.Priority priority, Optional<TenantAndApplicationId> owner) {
var records = targets.stream()
.map(target -> new Record(Record.Type.DIRECT, name, target.pack()))
.toList();
forward(new CreateRecords(owner, records), priority);
}
/** Create or update a TXT record with given name and data */
public void createTxt(RecordName name, List<RecordData> txtData, NameServiceQueue.Priority priority, Optional<TenantAndApplicationId> owner) {
var records = txtData.stream()
.map(data -> new Record(Record.Type.TXT, name, data))
.toList();
forward(new CreateRecords(owner, records), priority);
}
/** Remove all records of given type and name */
public void removeRecords(Record.Type type, RecordName name, NameServiceQueue.Priority priority, Optional<TenantAndApplicationId> owner) {
forward(new RemoveRecords(owner, type, name), priority);
}
/** Remove all records of given type, name and data */
public void removeRecords(Record.Type type, RecordName name, RecordData data, NameServiceQueue.Priority priority, Optional<TenantAndApplicationId> owner) {
forward(new RemoveRecords(owner, type, name, data), priority);
}
protected void forward(NameServiceRequest request, NameServiceQueue.Priority priority) {
try (Mutex lock = db.lockNameServiceQueue()) {
NameServiceQueue queue = db.readNameServiceQueue();
var queued = queue.requests().size();
if (queued > NameServiceQueue.QUEUE_CAPACITY) {
log.log(Level.WARNING, "Queue is above capacity (size: " + queued + "), failing requests will be dropped. " +
"This likely means that the name service is not successfully executing requests");
}
log.log(Level.FINE, () -> "Queueing name service request: " + request);
db.writeNameServiceQueue(queue.with(request, priority));
}
}
}
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