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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.session;
import com.yahoo.config.provision.TenantName;
import java.util.logging.Level;
import com.yahoo.path.Path;
import com.yahoo.transaction.NestedTransaction;
import com.yahoo.vespa.config.server.GlobalComponentRegistry;
import com.yahoo.vespa.config.server.deploy.TenantFileSystemDirs;
import com.yahoo.vespa.config.server.tenant.TenantRepository;
import com.yahoo.vespa.config.server.zookeeper.ConfigCurator;
import com.yahoo.vespa.curator.Curator;
import java.io.File;
import java.io.FilenameFilter;
import java.time.Clock;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
/**
* File-based session repository for LocalSessions. Contains state for the local instance of the configserver.
*
* @author Ulf Lilleengen
*/
public class LocalSessionRepo extends SessionRepo<LocalSession> {
private static final Logger log = Logger.getLogger(LocalSessionRepo.class.getName());
private static final FilenameFilter sessionApplicationsFilter = (dir, name) -> name.matches("\\d+");
private final Map<Long, LocalSessionStateWatcher> sessionStateWatchers = new HashMap<>();
private final long sessionLifetime; // in seconds
private final Clock clock;
private final Curator curator;
private final Executor zkWatcherExecutor;
private final TenantFileSystemDirs tenantFileSystemDirs;
public LocalSessionRepo(TenantName tenantName, GlobalComponentRegistry componentRegistry, LocalSessionLoader loader) {
this(tenantName, componentRegistry);
loadSessions(loader);
}
// Constructor public only for testing
public LocalSessionRepo(TenantName tenantName, GlobalComponentRegistry componentRegistry) {
this.clock = componentRegistry.getClock();
this.curator = componentRegistry.getCurator();
this.sessionLifetime = componentRegistry.getConfigserverConfig().sessionLifetime();
this.zkWatcherExecutor = command -> componentRegistry.getZkWatcherExecutor().execute(tenantName, command);
this.tenantFileSystemDirs = new TenantFileSystemDirs(componentRegistry.getConfigServerDB(), tenantName);
}
@Override
public synchronized void addSession(LocalSession session) {
super.addSession(session);
Path sessionsPath = TenantRepository.getSessionsPath(session.getTenantName());
long sessionId = session.getSessionId();
Curator.FileCache fileCache = curator.createFileCache(sessionsPath.append(String.valueOf(sessionId)).append(ConfigCurator.SESSIONSTATE_ZK_SUBPATH).getAbsolute(), false);
sessionStateWatchers.put(sessionId, new LocalSessionStateWatcher(fileCache, session, this, zkWatcherExecutor));
}
private void loadSessions(LocalSessionLoader loader) {
File[] sessions = tenantFileSystemDirs.sessionsPath().listFiles(sessionApplicationsFilter);
if (sessions == null) {
return;
}
for (File session : sessions) {
try {
addSession(loader.loadSession(Long.parseLong(session.getName())));
} catch (IllegalArgumentException e) {
log.log(Level.WARNING, "Could not load session '" +
session.getAbsolutePath() + "':" + e.getMessage() + ", skipping it.");
}
}
}
public void purgeOldSessions() {
log.log(Level.FINE, "Purging old sessions");
try {
List<LocalSession> sessions = new ArrayList<>(listSessions());
for (LocalSession candidate : sessions) {
if (hasExpired(candidate) && !isActiveSession(candidate)) {
deleteSession(candidate);
}
}
// Make sure to catch here, to avoid executor just dying in case of issues ...
} catch (Throwable e) {
log.log(Level.WARNING, "Error when purging old sessions ", e);
}
log.log(Level.FINE, "Done purging old sessions");
}
private boolean hasExpired(LocalSession candidate) {
return (candidate.getCreateTime() + sessionLifetime) <= TimeUnit.MILLISECONDS.toSeconds(clock.millis());
}
private boolean isActiveSession(LocalSession candidate) {
return candidate.getStatus() == Session.Status.ACTIVATE;
}
void deleteSession(LocalSession session) {
long sessionId = session.getSessionId();
log.log(Level.FINE, "Deleting local session " + sessionId);
LocalSessionStateWatcher watcher = sessionStateWatchers.remove(sessionId);
if (watcher != null) watcher.close();
removeSession(sessionId);
NestedTransaction transaction = new NestedTransaction();
session.delete(transaction);
transaction.commit();
}
public void close() {
deleteAllSessions();
tenantFileSystemDirs.delete();
}
private void deleteAllSessions() {
List<LocalSession> sessions = new ArrayList<>(listSessions());
for (LocalSession session : sessions) {
deleteSession(session);
}
}
}
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