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// Copyright Yahoo. 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.component.Version;
import com.yahoo.config.FileReference;
import com.yahoo.config.application.api.ApplicationFile;
import com.yahoo.config.application.api.ApplicationMetaData;
import com.yahoo.config.application.api.ApplicationPackage;
import com.yahoo.config.model.api.Quota;
import com.yahoo.config.model.api.TenantSecretStore;
import com.yahoo.config.provision.AllocatedHosts;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.AthenzDomain;
import com.yahoo.config.provision.CloudAccount;
import com.yahoo.config.provision.DataplaneToken;
import com.yahoo.config.provision.DockerImage;
import com.yahoo.config.provision.TenantName;
import com.yahoo.path.Path;
import com.yahoo.transaction.Transaction;
import com.yahoo.vespa.config.server.application.ApplicationVersions;
import com.yahoo.vespa.config.server.tenant.TenantRepository;
import java.security.cert.X509Certificate;
import java.time.Instant;
import java.util.List;
import java.util.Optional;
/**
* A session represents an instance of an application that can be edited, prepared and activated. This
* class represents the common stuff between sessions working on the local file
* system ({@link LocalSession}s) and sessions working on zookeeper ({@link RemoteSession}s).
*
* @author Ulf Lilleengen
* @author hmusum
*/
public abstract class Session implements Comparable<Session> {
protected final long sessionId;
protected final TenantName tenant;
protected final SessionZooKeeperClient sessionZooKeeperClient;
protected final Optional<ApplicationPackage> applicationPackage;
protected Session(TenantName tenant, long sessionId, SessionZooKeeperClient sessionZooKeeperClient) {
this(tenant, sessionId, sessionZooKeeperClient, Optional.empty());
}
protected Session(TenantName tenant, long sessionId, SessionZooKeeperClient sessionZooKeeperClient,
ApplicationPackage applicationPackage) {
this(tenant, sessionId, sessionZooKeeperClient, Optional.of(applicationPackage));
}
private Session(TenantName tenant, long sessionId, SessionZooKeeperClient sessionZooKeeperClient,
Optional<ApplicationPackage> applicationPackage) {
this.tenant = tenant;
this.sessionId = sessionId;
this.sessionZooKeeperClient = sessionZooKeeperClient;
this.applicationPackage = applicationPackage;
}
public final long getSessionId() { return sessionId; }
public Session.Status getStatus() {
return sessionZooKeeperClient.readStatus();
}
@Override
public String toString() {
return "Session,id=" + sessionId + ",status=" + getStatus();
}
public long getActiveSessionAtCreate() {
return getMetaData().getPreviousActiveGeneration();
}
/**
* The status of this session.
*/
public enum Status {
NEW, PREPARE, ACTIVATE, DEACTIVATE, UNKNOWN, DELETE;
public static Status parse(String data) {
for (Status status : Status.values()) {
if (status.name().equals(data)) {
return status;
}
}
return Status.NEW;
}
}
public TenantName getTenantName() { return tenant; }
/**
* Helper to provide a log message preamble for code dealing with sessions
* @return log preamble
*/
public String logPre() {
Optional<ApplicationId> applicationId = getOptionalApplicationId();
// We might not be able to read application id from zookeeper
// e.g. when the app has been deleted. Use tenant name in that case.
return applicationId
.filter(appId -> ! appId.equals(ApplicationId.defaultId()))
.map(TenantRepository::logPre)
.orElse(TenantRepository.logPre(getTenantName()));
}
public Instant getCreateTime() {
return sessionZooKeeperClient.readCreateTime();
}
public Instant getActivatedTime() {
return sessionZooKeeperClient.readActivatedTime();
}
/** Returns application id read from ZooKeeper. Will throw RuntimeException if not found */
public ApplicationId getApplicationId() { return sessionZooKeeperClient.readApplicationId(); }
/** Returns application id read from ZooKeeper. Will return Optional.empty() if not found */
public Optional<ApplicationId> getOptionalApplicationId() {
try {
return Optional.of(getApplicationId());
} catch (RuntimeException e) {
return Optional.empty();
}
}
public Optional<FileReference> getApplicationPackageReference() { return sessionZooKeeperClient.readApplicationPackageReference(); }
public Optional<DockerImage> getDockerImageRepository() { return sessionZooKeeperClient.readDockerImageRepository(); }
public Version getVespaVersion() { return sessionZooKeeperClient.readVespaVersion(); }
public Optional<AthenzDomain> getAthenzDomain() { return sessionZooKeeperClient.readAthenzDomain(); }
public Optional<Quota> getQuota() { return sessionZooKeeperClient.readQuota(); }
public AllocatedHosts getAllocatedHosts() {
return sessionZooKeeperClient.getAllocatedHosts();
}
public Transaction createDeactivateTransaction() {
return createSetStatusTransaction(Status.DEACTIVATE);
}
public List<TenantSecretStore> getTenantSecretStores() {
return sessionZooKeeperClient.readTenantSecretStores();
}
public List<X509Certificate> getOperatorCertificates() {
return sessionZooKeeperClient.readOperatorCertificates();
}
public Optional<CloudAccount> getCloudAccount() {
return sessionZooKeeperClient.readCloudAccount();
}
public List<DataplaneToken> getDataplaneTokens() {
return sessionZooKeeperClient.readDataplaneTokens();
}
public SessionZooKeeperClient getSessionZooKeeperClient() { return sessionZooKeeperClient; }
private Transaction createSetStatusTransaction(Status status) {
return sessionZooKeeperClient.createWriteStatusTransaction(status);
}
// Note: Assumes monotonically increasing session ids
public boolean isNewerThan(long sessionId) { return getSessionId() > sessionId; }
public ApplicationMetaData getMetaData() {
return applicationPackage.isPresent()
? applicationPackage.get().getMetaData()
: sessionZooKeeperClient.loadApplicationPackage().getMetaData();
}
public ApplicationPackage getApplicationPackage() {
return applicationPackage.orElseThrow(() -> new RuntimeException("No application package found for " + this));
}
public ApplicationFile getApplicationFile(Path relativePath, LocalSession.Mode mode) {
if (mode.equals(Session.Mode.WRITE)) {
markSessionEdited();
}
return getApplicationPackage().getFile(relativePath);
}
Optional<ApplicationVersions> applicationVersions() { return Optional.empty(); }
private void markSessionEdited() {
setStatus(Session.Status.NEW);
}
void setStatus(Session.Status newStatus) {
sessionZooKeeperClient.writeStatus(newStatus);
}
@Override
public int compareTo(Session rhs) {
Long lhsId = getSessionId();
Long rhsId = rhs.getSessionId();
return lhsId.compareTo(rhsId);
}
public enum Mode {
READ, WRITE
}
}
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