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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.api.integration.dns;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ConcurrentSkipListSet;
/**
* An in-memory name service for testing purposes.
*
* @author mpolden
*/
public class MemoryNameService implements NameService {
private final Set<Record> records = new ConcurrentSkipListSet<>();
public Set<Record> records() {
return Collections.unmodifiableSet(records);
}
public void add(Record record) {
Optional<Record> conflict = records.stream().filter(r -> conflicts(r, record)).findFirst();
if (conflict.isPresent()) {
throw new AssertionError("'" + record + "' conflicts with existing record '" +
conflict.get() + "'");
}
records.add(record);
}
@Override
public Record createRecord(Record.Type type, RecordName name, RecordData canonicalName) {
var record = new Record(type, name, canonicalName);
add(record);
return record;
}
@Override
public List<Record> createAlias(RecordName name, Set<AliasTarget> targets) {
var records = targets.stream()
.sorted((a, b) -> Comparator.comparing(AliasTarget::name).compare(a, b))
.map(d -> new Record(Record.Type.ALIAS, name, d.pack()))
.toList();
// Satisfy idempotency contract of interface
for (var r1 : records) {
this.records.removeIf(r2 -> conflicts(r1, r2));
}
this.records.addAll(records);
return records;
}
@Override
public List<Record> createDirect(RecordName name, Set<DirectTarget> targets) {
var records = targets.stream()
.sorted((a, b) -> Comparator.comparing((DirectTarget target) -> target.recordData().asString()).compare(a, b))
.map(d -> new Record(Record.Type.DIRECT, name, d.pack()))
.toList();
// Satisfy idempotency contract of interface
for (var r1 : records) {
this.records.removeIf(r2 -> conflicts(r1, r2));
}
this.records.addAll(records);
return records;
}
@Override
public List<Record> createTxtRecords(RecordName name, List<RecordData> txtData) {
var records = txtData.stream()
.map(data -> new Record(Record.Type.TXT, name, data))
.toList();
records.forEach(this::add);
return records;
}
@Override
public List<Record> findRecords(Record.Type type, RecordName name) {
return records.stream()
.filter(record -> record.type() == type && record.name().equals(name))
.toList();
}
@Override
public void updateRecord(Record record, RecordData newData) {
var records = findRecords(record.type(), record.name());
if (records.isEmpty()) {
throw new IllegalArgumentException("No record with data '" + newData.asString() + "' exists");
}
if (records.size() > 1) {
throw new IllegalArgumentException("Cannot update multi-value record '" + record.name().asString() +
"' with '" + newData.asString() + "'");
}
var existing = records.get(0);
this.records.remove(existing);
add(new Record(existing.type(), existing.name(), newData));
}
@Override
public void removeRecords(List<Record> records) {
records.forEach(this.records::remove);
}
/**
* Returns whether record r1 and r2 are in conflict. This attempts to enforce the same constraints a
* most real name services.
*/
private static boolean conflicts(Record r1, Record r2) {
if (!r1.name().equals(r2.name())) return false; // Distinct names never conflict
if (r1.type() == Record.Type.ALIAS && r1.type() == r2.type()) {
AliasTarget t1 = AliasTarget.unpack(r1.data());
AliasTarget t2 = AliasTarget.unpack(r2.data());
return t1.name().equals(t2.name()); // ALIAS records require distinct targets
}
if (r1.type() == Record.Type.DIRECT && r1.type() == r2.type()) {
DirectTarget t1 = DirectTarget.unpack(r1.data());
DirectTarget t2 = DirectTarget.unpack(r2.data());
return t1.id().equals(t2.id()); // DIRECT records require distinct IDs
}
return true; // Anything else is considered a conflict
}
}
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