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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.orchestrator.status;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.jdisc.Timer;
import com.yahoo.path.Path;
import com.yahoo.vespa.applicationmodel.ApplicationInstanceReference;
import com.yahoo.vespa.applicationmodel.HostName;
import com.yahoo.vespa.curator.Curator;
import com.yahoo.vespa.orchestrator.OrchestratorUtil;
import com.yahoo.vespa.orchestrator.status.json.WireHostInfo;
import org.apache.zookeeper.KeeperException.NoNodeException;
import java.time.Instant;
import java.util.HashMap;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Handles all ZooKeeper data structures related to each active application, including HostInfo.
* Cache (if any) is above and not visible here.
*
* @author hakonhall
*/
public class HostInfosServiceImpl implements HostInfosService {
private static final Logger log = Logger.getLogger(HostInfosServiceImpl.class.getName());
private final Curator curator;
private final Timer timer;
HostInfosServiceImpl(Curator curator, Timer timer) {
this.curator = curator;
this.timer = timer;
}
@Override
public HostInfos getHostInfos(ApplicationInstanceReference reference) {
ApplicationId application = OrchestratorUtil.toApplicationId(reference);
String hostsRootPath = hostsPath(application);
List<String> hostnames;
try {
hostnames = curator.framework().getChildren().forPath(hostsRootPath);
} catch (NoNodeException e) {
return new HostInfos();
} catch (Exception e) {
throw new RuntimeException(e);
}
var hostInfos = new HashMap<HostName, HostInfo>();
for (var hostname : hostnames) {
byte[] bytes;
try {
bytes = curator.framework().getData().forPath(hostsRootPath + "/" + hostname);
} catch (NoNodeException e) {
// OK, node has been removed since getChildren()
continue;
} catch (Exception e) {
throw new RuntimeException(e);
}
hostInfos.put(new HostName(hostname), WireHostInfo.deserialize(bytes));
}
return new HostInfos(hostInfos);
}
@Override
public boolean setHostStatus(ApplicationInstanceReference reference, HostName hostname, HostStatus status) {
ApplicationId application = OrchestratorUtil.toApplicationId(reference);
String path = hostPath(application, hostname);
if (status == HostStatus.NO_REMARKS) {
return deleteNode_ignoreNoNodeException(path, "Host already has state NO_REMARKS, path = " + path);
}
Optional<HostInfo> currentHostInfo = uncheck(() -> readBytesFromZk(path)).map(WireHostInfo::deserialize);
if (currentHostInfo.isEmpty()) {
Instant suspendedSince = timer.currentTime();
HostInfo hostInfo = HostInfo.createSuspended(status, suspendedSince);
byte[] hostInfoBytes = WireHostInfo.serialize(hostInfo);
uncheck(() -> curator.framework().create().creatingParentsIfNeeded().forPath(path, hostInfoBytes));
} else if (currentHostInfo.get().status() == status) {
return false;
} else {
Instant suspendedSince = currentHostInfo.get().suspendedSince().orElseGet(timer::currentTime);
HostInfo hostInfo = HostInfo.createSuspended(status, suspendedSince);
byte[] hostInfoBytes = WireHostInfo.serialize(hostInfo);
uncheck(() -> curator.framework().setData().forPath(path, hostInfoBytes));
}
return true;
}
@Override
public void removeApplication(ApplicationInstanceReference reference) {
ApplicationId application = OrchestratorUtil.toApplicationId(reference);
curator.delete(Path.fromString(applicationPath(application)));
}
@Override
public void removeHosts(ApplicationInstanceReference reference, Set<HostName> hostnames) {
ApplicationId application = OrchestratorUtil.toApplicationId(reference);
// Needed for VESPA-18864:
log.info("Removing host status for " + application + ": " + hostnames);
// Remove /vespa/host-status/APPLICATION_ID/hosts/HOSTNAME
hostnames.forEach(hostname -> curator.delete(Path.fromString(hostPath(application, hostname))));
}
private Optional<byte[]> readBytesFromZk(String path) throws Exception {
try {
return Optional.of(curator.framework().getData().forPath(path));
} catch (NoNodeException e) {
return Optional.empty();
}
}
private boolean deleteNode_ignoreNoNodeException(String path, String debugLogMessageIfNotExists) {
try {
curator.framework().delete().forPath(path);
return true;
} catch (NoNodeException e) {
log.log(Level.FINE, debugLogMessageIfNotExists, e);
return false;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
static String applicationPath(ApplicationId application) {
return "/vespa/host-status/" + application.serializedForm();
}
private static String hostsPath(ApplicationId application) {
return applicationPath(application) + "/hosts";
}
private static String hostPath(ApplicationId application, HostName hostname) {
return hostsPath(application) + "/" + hostname.s();
}
private <T> T uncheck(SupplierThrowingException<T> supplier) {
try {
return supplier.get();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@FunctionalInterface
private interface SupplierThrowingException<T> {
T get() throws Exception;
}
}
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