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// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.persistence;
import com.yahoo.component.Version;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.hosted.controller.versions.DeploymentStatistics;
import com.yahoo.vespa.hosted.controller.versions.NodeVersions;
import com.yahoo.vespa.hosted.controller.versions.VersionStatus;
import com.yahoo.vespa.hosted.controller.versions.VespaVersion;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
/**
* Serializer for {@link VersionStatus}.
*
* @author mpolden
*/
public class VersionStatusSerializer {
// WARNING: Since there are multiple servers in a ZooKeeper cluster and they upgrade one by one
// (and rewrite all nodes on startup), changes to the serialized format must be made
// such that what is serialized on version N+1 can be read by version N:
// - ADDING FIELDS: Always ok
// - REMOVING FIELDS: Stop reading the field first. Stop writing it on a later version.
// - CHANGING THE FORMAT OF A FIELD: Don't do it bro.
// VersionStatus fields
private static final String versionsField = "versions";
// VespaVersion fields
private static final String releaseCommitField = "releaseCommit";
private static final String committedAtField = "releasedAt";
private static final String isControllerVersionField = "isCurrentControllerVersion";
private static final String isSystemVersionField = "isCurrentSystemVersion";
private static final String isReleasedField = "isReleased";
private static final String deploymentStatisticsField = "deploymentStatistics";
private static final String confidenceField = "confidence";
private static final String configServersField = "configServerHostnames";
// NodeVersions fields
private static final String nodeVersionsField = "nodeVersions";
// DeploymentStatistics fields
private static final String versionField = "version";
private static final String failingField = "failing";
private static final String productionField = "production";
private static final String deployingField = "deploying";
private final NodeVersionSerializer nodeVersionSerializer;
public VersionStatusSerializer(NodeVersionSerializer nodeVersionSerializer) {
this.nodeVersionSerializer = Objects.requireNonNull(nodeVersionSerializer, "nodeVersionSerializer must be non-null");
}
public Slime toSlime(VersionStatus status) {
Slime slime = new Slime();
Cursor root = slime.setObject();
versionsToSlime(status.versions(), root.setArray(versionsField));
return slime;
}
public VersionStatus fromSlime(Slime slime) {
Inspector root = slime.get();
return new VersionStatus(vespaVersionsFromSlime(root.field(versionsField)));
}
private void versionsToSlime(List<VespaVersion> versions, Cursor array) {
versions.forEach(version -> vespaVersionToSlime(version, array.addObject()));
}
private void vespaVersionToSlime(VespaVersion version, Cursor object) {
object.setString(releaseCommitField, version.releaseCommit());
object.setLong(committedAtField, version.committedAt().toEpochMilli());
object.setBool(isControllerVersionField, version.isControllerVersion());
object.setBool(isSystemVersionField, version.isSystemVersion());
object.setBool(isReleasedField, version.isReleased());
deploymentStatisticsToSlime(version.statistics(), object.setObject(deploymentStatisticsField));
object.setString(confidenceField, version.confidence().name());
nodeVersionsToSlime(version.nodeVersions(), object.setArray(nodeVersionsField));
}
private void nodeVersionsToSlime(NodeVersions nodeVersions, Cursor array) {
nodeVersionSerializer.nodeVersionsToSlime(nodeVersions, array);
}
private void deploymentStatisticsToSlime(DeploymentStatistics statistics, Cursor object) {
object.setString(versionField, statistics.version().toString());
applicationsToSlime(statistics.failing(), object.setArray(failingField));
applicationsToSlime(statistics.production(), object.setArray(productionField));
applicationsToSlime(statistics.deploying(), object.setArray(deployingField));
}
private void applicationsToSlime(Collection<ApplicationId> applications, Cursor array) {
applications.forEach(application -> array.addString(application.serializedForm()));
}
private List<VespaVersion> vespaVersionsFromSlime(Inspector array) {
List<VespaVersion> versions = new ArrayList<>();
array.traverse((ArrayTraverser) (i, object) -> versions.add(vespaVersionFromSlime(object)));
return Collections.unmodifiableList(versions);
}
private VespaVersion vespaVersionFromSlime(Inspector object) {
var deploymentStatistics = deploymentStatisticsFromSlime(object.field(deploymentStatisticsField));
return new VespaVersion(deploymentStatistics,
object.field(releaseCommitField).asString(),
Instant.ofEpochMilli(object.field(committedAtField).asLong()),
object.field(isControllerVersionField).asBool(),
object.field(isSystemVersionField).asBool(),
object.field(isReleasedField).asBool(),
nodeVersionSerializer.nodeVersionsFromSlime(object.field(nodeVersionsField), deploymentStatistics.version()),
VespaVersion.Confidence.valueOf(object.field(confidenceField).asString())
);
}
private DeploymentStatistics deploymentStatisticsFromSlime(Inspector object) {
return new DeploymentStatistics(Version.fromString(object.field(versionField).asString()),
applicationsFromSlime(object.field(failingField)),
applicationsFromSlime(object.field(productionField)),
applicationsFromSlime(object.field(deployingField)));
}
private List<ApplicationId> applicationsFromSlime(Inspector array) {
List<ApplicationId> applications = new ArrayList<>();
array.traverse((ArrayTraverser) (i, entry) -> applications.add(
ApplicationId.fromSerializedForm(entry.asString()))
);
return Collections.unmodifiableList(applications);
}
}
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