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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.curator;
import com.yahoo.component.AbstractComponent;
import com.yahoo.component.annotation.Inject;
import com.yahoo.concurrent.UncheckedTimeoutException;
import com.yahoo.jdisc.Metric;
import com.yahoo.path.Path;
import com.yahoo.vespa.curator.api.VespaCurator;
import com.yahoo.yolean.UncheckedInterruptedException;
import org.apache.curator.framework.state.ConnectionState;
import org.apache.zookeeper.KeeperException.BadVersionException;
import org.apache.zookeeper.data.Stat;
import java.time.Clock;
import java.time.Duration;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* Implementation of {@link VespaCurator} which delegates to a {@link Curator}.
* This prefixes all paths with {@code "/user"}, to ensure separation with system ZK usage.
*
* @author jonmv
*/
public class CuratorWrapper extends AbstractComponent implements VespaCurator {
static final Path userRoot = Path.fromString("user");
private final Curator curator;
private final SingletonManager singletons;
@Inject
public CuratorWrapper(Curator curator, Metric metric) {
this(curator, Clock.systemUTC(), Duration.ofSeconds(1), metric);
}
CuratorWrapper(Curator curator, Clock clock, Duration tickTimeout, Metric metric) {
this.curator = curator;
this.singletons = new SingletonManager(curator, clock, tickTimeout, metric);
curator.framework().getConnectionStateListenable().addListener((curatorFramework, connectionState) -> {
if (connectionState == ConnectionState.LOST) singletons.invalidate();
});
}
@Override
public Optional<Meta> stat(Path path) {
return curator.getStat(userRoot.append(path)).map(stat -> new Meta(stat.getVersion()));
}
@Override
public Optional<Data> read(Path path) {
Stat stat = new Stat();
return curator.getData(userRoot.append(path), stat).map(data -> new Data(new Meta(stat.getVersion()), data));
}
@Override
public Meta write(Path path, byte[] data) {
return new Meta(curator.set(userRoot.append(path), data).getVersion());
}
@Override
public Optional<Meta> write(Path path, byte[] data, int expectedVersion) {
try {
return Optional.of(new Meta(curator.set(userRoot.append(path), data, expectedVersion).getVersion()));
}
catch (RuntimeException e) {
if (e.getCause() instanceof BadVersionException) return Optional.empty();
throw e;
}
}
@Override
public void deleteAll(Path path) {
curator.delete(userRoot.append(path));
}
@Override
public void delete(Path path) {
curator.delete(userRoot.append(path), false);
}
@Override
public boolean delete(Path path, int expectedVersion) {
try {
curator.delete(userRoot.append(path), expectedVersion, false);
return true;
}
catch (RuntimeException e) {
if (e.getCause() instanceof BadVersionException) return false;
throw e;
}
}
@Override
public List<String> list(Path path) {
return curator.getChildren(userRoot.append(path));
}
@Override
public AutoCloseable lock(Path path, Duration timeout) {
return curator.lock(userRoot.append(path), timeout);
}
@Override
public void register(SingletonWorker singleton, Duration timeout) {
try {
await(singletons.register(singleton.id(), singleton), timeout, "registering " + singleton);
}
catch (RuntimeException e) {
try {
unregister(singleton, timeout);
}
catch (Exception f) {
e.addSuppressed(f);
}
throw e;
}
}
@Override
public void unregister(SingletonWorker singleton, Duration timeout) {
await(singletons.unregister(singleton), timeout, "unregistering " + singleton);
}
private void await(Future<?> future, Duration timeout, String action) {
try {
future.get(timeout.toMillis(), TimeUnit.MILLISECONDS);
}
catch (InterruptedException e) {
future.cancel(true);
throw new UncheckedInterruptedException("interrupted while " + action, e, true);
}
catch (TimeoutException e) {
future.cancel(true);
throw new UncheckedTimeoutException("timed out while " + action, e);
}
catch (ExecutionException e) {
throw new RuntimeException("failed " + action, e.getCause());
}
}
@Override
public boolean isActive(String singletonId) {
return singletons.isActive(singletonId);
}
@Override
public void deconstruct() {
try {
singletons.shutdown().get();
}
catch (InterruptedException e) {
throw new UncheckedInterruptedException(e, true);
}
catch (ExecutionException e) {
throw new RuntimeException(e.getCause());
}
}
}
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