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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.config.provision;
import com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.config.SlimeUtils;
import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Optional;
import java.util.Set;
/**
* Information about hosts provisioned for an application, and (de)serialization of this information to/from JSON.
*
* @author lulf
* @since 5.12
*/
public class ProvisionInfo {
private static final String mappingKey = "mapping";
private static final String hostSpecKey = "hostSpec";
private static final String hostSpecHostName = "hostName";
private static final String hostSpecMembership = "membership";
private static final String hostSpecFlavor = "flavor";
private static final String hostSpecVespaVersion = "vespaVersion";
private final Set<HostSpec> hosts = new LinkedHashSet<>();
private ProvisionInfo(Set<HostSpec> hosts) {
this.hosts.addAll(hosts);
}
public static ProvisionInfo withHosts(Set<HostSpec> hosts) {
return new ProvisionInfo(hosts);
}
private void toSlime(Cursor cursor) {
Cursor array = cursor.setArray(mappingKey);
for (HostSpec host : hosts) {
Cursor object = array.addObject();
serializeHostSpec(object.setObject(hostSpecKey), host);
}
}
private void serializeHostSpec(Cursor cursor, HostSpec host) {
cursor.setString(hostSpecHostName, host.hostname());
if (host.membership().isPresent()) {
cursor.setString(hostSpecMembership, host.membership().get().stringValue());
cursor.setString(hostSpecVespaVersion, host.membership().get().cluster().vespaVersion().toString());
}
if (host.flavor().isPresent())
cursor.setString(hostSpecFlavor, host.flavor().get().name());
}
public Set<HostSpec> getHosts() {
return Collections.unmodifiableSet(hosts);
}
private static ProvisionInfo fromSlime(Inspector inspector, Optional<NodeFlavors> nodeFlavors) {
Inspector array = inspector.field(mappingKey);
Set<HostSpec> hosts = new LinkedHashSet<>();
array.traverse(new ArrayTraverser() {
@Override
public void entry(int i, Inspector inspector) {
hosts.add(deserializeHostSpec(inspector.field(hostSpecKey), nodeFlavors));
}
});
return new ProvisionInfo(hosts);
}
private static HostSpec deserializeHostSpec(Inspector object, Optional<NodeFlavors> nodeFlavors) {
Optional<ClusterMembership> membership =
object.field(hostSpecMembership).valid() ? Optional.of(readMembership(object)) : Optional.empty();
Optional<Flavor> flavor =
object.field(hostSpecFlavor).valid() ? readFlavor(object, nodeFlavors) : Optional.empty();
return new HostSpec(object.field(hostSpecHostName).asString(),Collections.emptyList(), flavor, membership);
}
private static ClusterMembership readMembership(Inspector object) {
return ClusterMembership.from(object.field(hostSpecMembership).asString(),
com.yahoo.component.Version.fromString(object.field(hostSpecVespaVersion).asString()));
}
private static Optional<Flavor> readFlavor(Inspector object, Optional<NodeFlavors> nodeFlavors) {
return nodeFlavors.map(flavorMapper -> flavorMapper.getFlavor(object.field(hostSpecFlavor).asString()))
.orElse(Optional.empty());
}
public byte[] toJson() throws IOException {
Slime slime = new Slime();
toSlime(slime.setObject());
return SlimeUtils.toJsonBytes(slime);
}
public static ProvisionInfo fromJson(byte[] json, Optional<NodeFlavors> nodeFlavors) {
return fromSlime(SlimeUtils.jsonToSlime(json).get(), nodeFlavors);
}
public ProvisionInfo merge(ProvisionInfo provisionInfo) {
Set<HostSpec> mergedSet = new LinkedHashSet<>();
mergedSet.addAll(this.hosts);
mergedSet.addAll(provisionInfo.getHosts());
return ProvisionInfo.withHosts(mergedSet);
}
}
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