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// Copyright 2016 Yahoo Inc. 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.log.LogLevel;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.vespa.config.server.application.TenantApplications;
import com.yahoo.vespa.config.server.deploy.TenantFileSystemDirs;
import java.io.File;
import java.io.FilenameFilter;
import java.time.Clock;
import java.util.ArrayList;
import java.util.List;
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 lulf
* @since 5.1
*/
public class LocalSessionRepo extends SessionRepo<LocalSession> {
private static final Logger log = Logger.getLogger(LocalSessionRepo.class.getName());
private final static FilenameFilter sessionApplicationsFilter = new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
return name.matches("\\d+");
}
};
private final long sessionLifetime; // in seconds
private final TenantApplications applicationRepo;
private final Clock clock;
public LocalSessionRepo(TenantFileSystemDirs tenantFileSystemDirs, LocalSessionLoader loader, TenantApplications applicationRepo, Clock clock, long sessionLifeTime) {
this(applicationRepo, clock, sessionLifeTime);
loadSessions(tenantFileSystemDirs.path(), loader);
}
private void loadSessions(File applicationsDir, LocalSessionLoader loader) {
File[] applications = applicationsDir.listFiles(sessionApplicationsFilter);
if (applications == null) {
return;
}
for (File application : applications) {
try {
addSession(loader.loadSession(Long.parseLong(application.getName())));
} catch (IllegalArgumentException e) {
log.log(LogLevel.WARNING, "Could not load application '" + application.getAbsolutePath() + "':" + e.getMessage() + ", skipping it.");
}
}
}
/**
* Gets the active Session for the given application id.
*
* @return the active session, or null if there is no active session for the given application id.
*/
public LocalSession getActiveSession(ApplicationId applicationId) {
List<ApplicationId> applicationIds = applicationRepo.listApplications();
if (applicationIds.contains(applicationId)) {
return getSession(applicationRepo.getSessionIdForApplication(applicationId));
}
return null;
}
// Constructor only for testing
public LocalSessionRepo(TenantApplications applicationRepo, Clock clock, long sessionLifetime) {
this.applicationRepo = applicationRepo;
this.sessionLifetime = sessionLifetime;
this.clock = clock;
}
public LocalSessionRepo(TenantApplications applicationRepo) {
this(applicationRepo, Clock.systemUTC(), TimeUnit.DAYS.toMillis(1));
}
@Override
public synchronized void addSession(LocalSession session) {
purgeOldSessions();
super.addSession(session);
}
private void purgeOldSessions() {
final List<ApplicationId> applicationIds = applicationRepo.listApplications();
List<LocalSession> sessions = new ArrayList<>(listSessions());
for (LocalSession candidate : sessions) {
if (hasExpired(candidate) && !isActiveSession(candidate, applicationIds)) {
deleteSession(candidate);
}
}
}
private boolean hasExpired(LocalSession candidate) {
return (candidate.getCreateTime() + sessionLifetime) <= TimeUnit.MILLISECONDS.toSeconds(clock.millis());
}
private boolean isActiveSession(LocalSession candidate, List<ApplicationId> activeIds) {
if (candidate.getStatus() == Session.Status.ACTIVATE && activeIds.contains(candidate.getApplicationId())) {
long sessionId = applicationRepo.getSessionIdForApplication(candidate.getApplicationId());
return (candidate.getSessionId() == sessionId);
} else {
return false;
}
}
private void deleteSession(LocalSession candidate) {
removeSessionOrThrow(candidate.getSessionId());
candidate.delete();
}
public void deleteAllSessions() {
List<LocalSession> sessions = new ArrayList<>(listSessions());
for (LocalSession session : sessions) {
deleteSession(session);
}
}
}
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