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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.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.zone.ZoneId;
import com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.slime.SlimeUtils;
import com.yahoo.vespa.hosted.controller.application.EndpointId;
import com.yahoo.vespa.hosted.controller.routing.RoutingPolicy;
import com.yahoo.vespa.hosted.controller.routing.RoutingPolicyId;
import com.yahoo.vespa.hosted.controller.routing.RoutingStatus;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
/**
* 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 instanceEndpointsField = "rotations";
private static final String applicationEndpointsField = "applicationEndpoints";
private static final String loadBalancerActiveField = "active";
private static final String globalRoutingField = "globalRouting";
private static final String agentField = "agent";
private static final String changedAtField = "changedAt";
private static final String statusField = "status";
public Slime toSlime(List<RoutingPolicy> routingPolicies) {
var slime = new Slime();
var root = slime.setObject();
var policyArray = root.setArray(routingPoliciesField);
routingPolicies.forEach(policy -> {
var policyObject = policyArray.addObject();
policyObject.setString(clusterField, policy.id().cluster().value());
policyObject.setString(zoneField, policy.id().zone().value());
policyObject.setString(canonicalNameField, policy.canonicalName().value());
policy.dnsZone().ifPresent(dnsZone -> policyObject.setString(dnsZoneField, dnsZone));
var instanceEndpointsArray = policyObject.setArray(instanceEndpointsField);
policy.instanceEndpoints().forEach(endpointId -> instanceEndpointsArray.addString(endpointId.id()));
var applicationEndpointsArray = policyObject.setArray(applicationEndpointsField);
policy.applicationEndpoints().forEach(endpointId -> applicationEndpointsArray.addString(endpointId.id()));
policyObject.setBool(loadBalancerActiveField, policy.status().isActive());
globalRoutingToSlime(policy.status().routingStatus(), policyObject.setObject(globalRoutingField));
});
return slime;
}
public List<RoutingPolicy> fromSlime(ApplicationId owner, Slime slime) {
List<RoutingPolicy> policies = new ArrayList<>();
var root = slime.get();
var field = root.field(routingPoliciesField);
field.traverse((ArrayTraverser) (i, inspect) -> {
Set<EndpointId> instanceEndpoints = new LinkedHashSet<>();
inspect.field(instanceEndpointsField).traverse((ArrayTraverser) (j, endpointId) -> instanceEndpoints.add(EndpointId.of(endpointId.asString())));
Set<EndpointId> applicationEndpoints = new LinkedHashSet<>();
inspect.field(applicationEndpointsField).traverse((ArrayTraverser) (idx, endpointId) -> applicationEndpoints.add(EndpointId.of(endpointId.asString())));
RoutingPolicyId id = new RoutingPolicyId(owner,
ClusterSpec.Id.from(inspect.field(clusterField).asString()),
ZoneId.from(inspect.field(zoneField).asString()));
policies.add(new RoutingPolicy(id,
HostName.from(inspect.field(canonicalNameField).asString()),
SlimeUtils.optionalString(inspect.field(dnsZoneField)),
instanceEndpoints,
applicationEndpoints,
new RoutingPolicy.Status(inspect.field(loadBalancerActiveField).asBool(),
globalRoutingFromSlime(inspect.field(globalRoutingField)))));
});
return Collections.unmodifiableList(policies);
}
public void globalRoutingToSlime(RoutingStatus routingStatus, Cursor object) {
object.setString(statusField, routingStatus.value().name());
object.setString(agentField, routingStatus.agent().name());
object.setLong(changedAtField, routingStatus.changedAt().toEpochMilli());
}
public RoutingStatus globalRoutingFromSlime(Inspector object) {
var status = RoutingStatus.Value.valueOf(object.field(statusField).asString());
var agent = RoutingStatus.Agent.valueOf(object.field(agentField).asString());
var changedAt = SlimeUtils.optionalInstant(object.field(changedAtField)).orElse(Instant.EPOCH);
return new RoutingStatus(status, agent, changedAt);
}
}
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