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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.config.provision.ApplicationId;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.HostName;
import com.yahoo.config.provision.RotationName;
import com.yahoo.config.provision.zone.ZoneId;
import com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.hosted.controller.application.RoutingPolicy;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.function.Function;
/**
* Serializer and deserializer for a {@link RoutingPolicy}.
*
* @author mortent
* @author mpolden
*/
public class RoutingPolicySerializer {
// 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.
private static final String routingPoliciesField = "routingPolicies";
private static final String clusterField = "cluster";
private static final String canonicalNameField = "canonicalName";
private static final String zoneField = "zone";
private static final String dnsZoneField = "dnsZone";
private static final String rotationsField = "rotations";
public Slime toSlime(Set<RoutingPolicy> routingPolicies) {
Slime slime = new Slime();
Cursor root = slime.setObject();
Cursor policyArray = root.setArray(routingPoliciesField);
routingPolicies.forEach(policy -> {
Cursor policyObject = policyArray.addObject();
policyObject.setString(clusterField, policy.cluster().value());
policyObject.setString(zoneField, policy.zone().value());
policyObject.setString(canonicalNameField, policy.canonicalName().value());
policy.dnsZone().ifPresent(dnsZone -> policyObject.setString(dnsZoneField, dnsZone));
Cursor rotationArray = policyObject.setArray(rotationsField);
policy.rotations().forEach(rotation -> {
rotationArray.addString(rotation.value());
});
});
return slime;
}
public Set<RoutingPolicy> fromSlime(ApplicationId owner, Slime slime) {
Set<RoutingPolicy> policies = new LinkedHashSet<>();
Cursor root = slime.get();
Cursor field = root.field(routingPoliciesField);
field.traverse((ArrayTraverser) (i, inspect) -> {
Set<RotationName> rotations = new LinkedHashSet<>();
inspect.field(rotationsField).traverse((ArrayTraverser) (j, rotation) -> rotations.add(RotationName.from(rotation.asString())));
policies.add(new RoutingPolicy(owner,
ClusterSpec.Id.from(inspect.field(clusterField).asString()),
ZoneId.from(inspect.field(zoneField).asString()),
HostName.from(inspect.field(canonicalNameField).asString()),
Serializers.optionalField(inspect.field(dnsZoneField), Function.identity()),
rotations));
});
return Collections.unmodifiableSet(policies);
}
}
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