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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.application.api.ApplicationPackage;
import com.yahoo.config.application.api.DeployLogger;
import com.yahoo.config.model.application.provider.*;
import com.yahoo.config.provision.NodeFlavors;
import com.yahoo.io.IOUtils;
import com.yahoo.log.LogLevel;
import com.yahoo.path.Path;
import com.yahoo.vespa.config.server.*;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.TenantName;
import com.yahoo.vespa.config.server.application.TenantApplications;
import com.yahoo.vespa.config.server.deploy.TenantFileSystemDirs;
import com.yahoo.vespa.config.server.host.HostValidator;
import com.yahoo.vespa.config.server.tenant.TenantRepository;
import com.yahoo.vespa.config.server.zookeeper.SessionCounter;
import com.yahoo.vespa.config.server.zookeeper.ConfigCurator;
import com.yahoo.vespa.curator.Curator;
import com.yahoo.vespa.flags.FlagSource;
import java.io.File;
import java.time.Clock;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
/**
* Serves as the factory of sessions. Takes care of copying files to the correct folder and initializing the
* session state.
*
* @author Ulf Lilleengen
*/
public class SessionFactoryImpl implements SessionFactory, LocalSessionLoader {
private static final Logger log = Logger.getLogger(SessionFactoryImpl.class.getName());
private static final long nonExistingActiveSession = 0;
private final SessionPreparer sessionPreparer;
private final Curator curator;
private final ConfigCurator configCurator;
private final SessionCounter sessionCounter;
private final TenantApplications applicationRepo;
private final Path sessionsPath;
private final TenantFileSystemDirs tenantFileSystemDirs;
private final HostValidator<ApplicationId> hostRegistry;
private final TenantName tenant;
private final String serverId;
private final Optional<NodeFlavors> nodeFlavors;
private final Clock clock;
private final FlagSource flagSource;
public SessionFactoryImpl(GlobalComponentRegistry globalComponentRegistry,
TenantApplications applicationRepo,
HostValidator<ApplicationId> hostRegistry,
TenantName tenant) {
this.hostRegistry = hostRegistry;
this.tenant = tenant;
this.sessionPreparer = globalComponentRegistry.getSessionPreparer();
this.curator = globalComponentRegistry.getCurator();
this.configCurator = globalComponentRegistry.getConfigCurator();
this.sessionCounter = new SessionCounter(globalComponentRegistry.getConfigCurator(), tenant);
this.sessionsPath = TenantRepository.getSessionsPath(tenant);
this.applicationRepo = applicationRepo;
this.tenantFileSystemDirs = new TenantFileSystemDirs(globalComponentRegistry.getConfigServerDB(), tenant);
this.serverId = globalComponentRegistry.getConfigserverConfig().serverId();
this.nodeFlavors = globalComponentRegistry.getZone().nodeFlavors();
this.clock = globalComponentRegistry.getClock();
this.flagSource = globalComponentRegistry.getFlagSource();
}
/** Create a session for a true application package change */
@Override
public LocalSession createSession(File applicationFile,
ApplicationId applicationId,
TimeoutBudget timeoutBudget) {
return create(applicationFile, applicationId, nonExistingActiveSession, false, timeoutBudget);
}
private void ensureZKPathDoesNotExist(Path sessionPath) {
if (configCurator.exists(sessionPath.getAbsolute())) {
throw new IllegalArgumentException("Path " + sessionPath.getAbsolute() + " already exists in ZooKeeper");
}
}
private ApplicationPackage createApplication(File userDir,
File configApplicationDir,
ApplicationId applicationId,
long sessionId,
long currentlyActiveSessionId,
boolean internalRedeploy) {
long deployTimestamp = System.currentTimeMillis();
String user = System.getenv("USER");
if (user == null) {
user = "unknown";
}
DeployData deployData = new DeployData(user, userDir.getAbsolutePath(), applicationId, deployTimestamp, internalRedeploy, sessionId, currentlyActiveSessionId);
return FilesApplicationPackage.fromFileWithDeployData(configApplicationDir, deployData);
}
private LocalSession createSessionFromApplication(ApplicationPackage applicationPackage,
long sessionId,
SessionZooKeeperClient sessionZKClient,
TimeoutBudget timeoutBudget,
Clock clock) {
log.log(LogLevel.DEBUG, TenantRepository.logPre(tenant) + "Creating session " + sessionId + " in ZooKeeper");
sessionZKClient.createNewSession(clock.instant().toEpochMilli(), TimeUnit.MILLISECONDS);
log.log(LogLevel.DEBUG, TenantRepository.logPre(tenant) + "Creating upload waiter for session " + sessionId);
Curator.CompletionWaiter waiter = sessionZKClient.getUploadWaiter();
log.log(LogLevel.DEBUG, TenantRepository.logPre(tenant) + "Done creating upload waiter for session " + sessionId);
SessionContext context = new SessionContext(applicationPackage, sessionZKClient, getSessionAppDir(sessionId), applicationRepo, hostRegistry, flagSource);
LocalSession session = new LocalSession(tenant, sessionId, sessionPreparer, context);
log.log(LogLevel.DEBUG, TenantRepository.logPre(tenant) + "Waiting on upload waiter for session " + sessionId);
waiter.awaitCompletion(timeoutBudget.timeLeft());
log.log(LogLevel.DEBUG, TenantRepository.logPre(tenant) + "Done waiting on upload waiter for session " + sessionId);
return session;
}
@Override
public LocalSession createSessionFromExisting(LocalSession existingSession,
DeployLogger logger,
boolean internalRedeploy,
TimeoutBudget timeoutBudget) {
File existingApp = getSessionAppDir(existingSession.getSessionId());
ApplicationId existingApplicationId = existingSession.getApplicationId();
long activeSessionId = getActiveSessionId(existingApplicationId);
logger.log(LogLevel.DEBUG, "Create new session for application id '" + existingApplicationId + "' from existing active session " + activeSessionId);
LocalSession session = create(existingApp, existingApplicationId, activeSessionId, internalRedeploy, timeoutBudget);
// Note: Needs to be kept in sync with calls in SessionPreparer.writeStateToZooKeeper()
session.setApplicationId(existingApplicationId);
session.setVespaVersion(existingSession.getVespaVersion());
session.setDockerImageRepository(existingSession.getDockerImageRepository());
session.setAthenzDomain(existingSession.getAthenzDomain());
return session;
}
private LocalSession create(File applicationFile, ApplicationId applicationId, long currentlyActiveSessionId,
boolean internalRedeploy, TimeoutBudget timeoutBudget) {
long sessionId = sessionCounter.nextSessionId();
Path sessionIdPath = sessionsPath.append(String.valueOf(sessionId));
try {
ensureZKPathDoesNotExist(sessionIdPath);
SessionZooKeeperClient sessionZooKeeperClient = new SessionZooKeeperClient(curator,
configCurator,
sessionIdPath,
serverId,
nodeFlavors);
File userApplicationDir = tenantFileSystemDirs.getUserApplicationDir(sessionId);
IOUtils.copyDirectory(applicationFile, userApplicationDir);
ApplicationPackage applicationPackage = createApplication(applicationFile,
userApplicationDir,
applicationId,
sessionId,
currentlyActiveSessionId,
internalRedeploy);
applicationPackage.writeMetaData();
return createSessionFromApplication(applicationPackage, sessionId, sessionZooKeeperClient, timeoutBudget, clock);
} catch (Exception e) {
throw new RuntimeException("Error creating session " + sessionIdPath, e);
}
}
private File getSessionAppDir(long sessionId) {
File appDir = tenantFileSystemDirs.getUserApplicationDir(sessionId);
if (!appDir.exists() || !appDir.isDirectory()) {
throw new IllegalArgumentException("Unable to find correct application directory for session " + sessionId);
}
return appDir;
}
@Override
public LocalSession loadSession(long sessionId) {
File sessionDir = getSessionAppDir(sessionId);
ApplicationPackage applicationPackage = FilesApplicationPackage.fromFile(sessionDir);
Path sessionIdPath = sessionsPath.append(String.valueOf(sessionId));
SessionZooKeeperClient sessionZKClient = new SessionZooKeeperClient(curator,
configCurator,
sessionIdPath,
serverId,
nodeFlavors);
SessionContext context = new SessionContext(applicationPackage, sessionZKClient, sessionDir, applicationRepo,
hostRegistry, flagSource);
return new LocalSession(tenant, sessionId, sessionPreparer, context);
}
private long getActiveSessionId(ApplicationId applicationId) {
List<ApplicationId> applicationIds = applicationRepo.activeApplications();
if (applicationIds.contains(applicationId)) {
return applicationRepo.requireActiveSessionOf(applicationId);
}
return nonExistingActiveSession;
}
}
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