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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.maintenance;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.RotationName;
import com.yahoo.config.provision.zone.ZoneId;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.curator.Lock;
import com.yahoo.vespa.hosted.controller.Controller;
import com.yahoo.vespa.hosted.controller.api.identifiers.DeploymentId;
import com.yahoo.vespa.hosted.controller.api.integration.configserver.LoadBalancer;
import com.yahoo.vespa.hosted.controller.api.integration.dns.AliasTarget;
import com.yahoo.vespa.hosted.controller.api.integration.dns.Record;
import com.yahoo.vespa.hosted.controller.api.integration.dns.RecordData;
import com.yahoo.vespa.hosted.controller.api.integration.dns.RecordName;
import com.yahoo.vespa.hosted.controller.application.Endpoint;
import com.yahoo.vespa.hosted.controller.application.RoutingId;
import com.yahoo.vespa.hosted.controller.application.RoutingPolicy;
import com.yahoo.vespa.hosted.controller.dns.NameServiceForwarder;
import com.yahoo.vespa.hosted.controller.dns.NameServiceQueue.Priority;
import com.yahoo.vespa.hosted.controller.persistence.CuratorDb;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;
import java.util.stream.Collectors;
/**
* Maintains routing policies and their DNS records for all exclusive load balancers in this system.
*
* @author mortent
* @author mpolden
*/
public class RoutingPolicyMaintainer extends Maintainer {
private static final Logger log = Logger.getLogger(RoutingPolicyMaintainer.class.getName());
private final NameServiceForwarder nameServiceForwarder;
private final CuratorDb db;
public RoutingPolicyMaintainer(Controller controller,
Duration interval,
JobControl jobControl,
CuratorDb db) {
super(controller, interval, jobControl);
this.nameServiceForwarder = controller.nameServiceForwarder();
this.db = db;
// Update serialized format
try (Lock lock = db.lockRoutingPolicies()) {
for (var policy : db.readRoutingPolicies().entrySet()) {
db.writeRoutingPolicies(policy.getKey(), policy.getValue());
}
}
}
@Override
protected void maintain() {
Map<DeploymentId, List<LoadBalancer>> loadBalancers = findLoadBalancers();
removeObsoleteEndpointsFromDns(loadBalancers);
storePolicies(loadBalancers);
removeObsoletePolicies(loadBalancers);
registerEndpointsInDns();
}
/** Find all exclusive load balancers in this system, grouped by deployment */
private Map<DeploymentId, List<LoadBalancer>> findLoadBalancers() {
Map<DeploymentId, List<LoadBalancer>> result = new LinkedHashMap<>();
for (ZoneId zone : controller().zoneRegistry().zones().controllerUpgraded().ids()) {
List<LoadBalancer> loadBalancers = controller().applications().configServer().getLoadBalancers(zone);
for (LoadBalancer loadBalancer : loadBalancers) {
DeploymentId deployment = new DeploymentId(loadBalancer.application(), zone);
result.compute(deployment, (k, existing) -> {
if (existing == null) {
existing = new ArrayList<>();
}
existing.add(loadBalancer);
return existing;
});
}
}
return Collections.unmodifiableMap(result);
}
/** Create global endpoints for all current routing policies */
private void registerEndpointsInDns() {
try (Lock lock = db.lockRoutingPolicies()) {
Map<RoutingId, List<RoutingPolicy>> routingTable = routingTableFrom(db.readRoutingPolicies());
// Create DNS record for each routing ID
for (Map.Entry<RoutingId, List<RoutingPolicy>> route : routingTable.entrySet()) {
Endpoint endpoint = RoutingPolicy.endpointOf(route.getKey().application(), route.getKey().rotation(),
controller().system());
Set<AliasTarget> targets = route.getValue()
.stream()
.filter(policy -> policy.dnsZone().isPresent())
.map(policy -> new AliasTarget(policy.canonicalName(),
policy.dnsZone().get(),
policy.zone()))
.collect(Collectors.toSet());
try {
nameServiceForwarder.createAlias(RecordName.from(endpoint.dnsName()), targets, Priority.normal);
} catch (Exception e) {
log.log(LogLevel.WARNING, "Failed to create or update DNS record for global rotation " +
endpoint.dnsName() + ". Retrying in " + maintenanceInterval(), e);
}
}
}
}
/** Store routing policies for all load balancers */
private void storePolicies(Map<DeploymentId, List<LoadBalancer>> loadBalancers) {
for (Map.Entry<DeploymentId, List<LoadBalancer>> entry : loadBalancers.entrySet()) {
ApplicationId application = entry.getKey().applicationId();
ZoneId zone = entry.getKey().zoneId();
try (Lock lock = db.lockRoutingPolicies()) {
Set<RoutingPolicy> policies = new LinkedHashSet<>(db.readRoutingPolicies(application));
for (LoadBalancer loadBalancer : entry.getValue()) {
try {
RoutingPolicy policy = storePolicy(application, zone, loadBalancer);
if (!policies.add(policy)) {
policies.remove(policy);
policies.add(policy);
}
} catch (Exception e) {
log.log(LogLevel.WARNING, "Failed to create or update DNS record for load balancer " +
loadBalancer.hostname() + ". Retrying in " + maintenanceInterval(),
e);
}
}
db.writeRoutingPolicies(application, policies);
}
}
}
/** Store policy for given load balancer and request a CNAME for it */
private RoutingPolicy storePolicy(ApplicationId application, ZoneId zone, LoadBalancer loadBalancer) {
RoutingPolicy routingPolicy = new RoutingPolicy(application, loadBalancer.cluster(), zone,
loadBalancer.hostname(), loadBalancer.dnsZone(),
loadBalancer.rotations());
RecordName name = RecordName.from(routingPolicy.endpointIn(controller().system()).dnsName());
RecordData data = RecordData.fqdn(loadBalancer.hostname().value());
nameServiceForwarder.createCname(name, data, Priority.normal);
return routingPolicy;
}
/** Remove obsolete policies and their CNAME records */
private void removeObsoletePolicies(Map<DeploymentId, List<LoadBalancer>> loadBalancers) {
try (Lock lock = db.lockRoutingPolicies()) {
var allPolicies = new HashMap<>(db.readRoutingPolicies());
var removalCandidates = allPolicies.values().stream()
.flatMap(Collection::stream)
.collect(Collectors.toSet());
var activeLoadBalancers = loadBalancers.values().stream()
.flatMap(Collection::stream)
.map(LoadBalancer::hostname)
.collect(Collectors.toSet());
// Keep active load balancers by removing them from candidates
removalCandidates.removeIf(policy -> activeLoadBalancers.contains(policy.canonicalName()));
for (var policy : removalCandidates) {
var dnsName = policy.endpointIn(controller().system()).dnsName();
nameServiceForwarder.removeRecords(Record.Type.CNAME, RecordName.from(dnsName), Priority.normal);
// Remove stale policy from curator
var updatedPolicies = new LinkedHashSet<>(allPolicies.getOrDefault(policy.owner(), Set.of()));
updatedPolicies.remove(policy);
allPolicies.put(policy.owner(), updatedPolicies);
db.writeRoutingPolicies(policy.owner(), updatedPolicies);
}
}
}
/** Remove DNS for global endpoints not referenced by given load balancers */
private void removeObsoleteEndpointsFromDns(Map<DeploymentId, List<LoadBalancer>> loadBalancers) {
try (Lock lock = db.lockRoutingPolicies()) {
Set<RoutingId> removalCandidates = routingTableFrom(db.readRoutingPolicies()).keySet();
Set<RoutingId> activeRoutingIds = routingIdsFrom(loadBalancers);
removalCandidates.removeAll(activeRoutingIds);
for (RoutingId id : removalCandidates) {
Endpoint endpoint = RoutingPolicy.endpointOf(id.application(), id.rotation(), controller().system());
nameServiceForwarder.removeRecords(Record.Type.ALIAS, RecordName.from(endpoint.dnsName()), Priority.normal);
}
}
}
/** Compute routing IDs from given load balancers */
private static Set<RoutingId> routingIdsFrom(Map<DeploymentId, List<LoadBalancer>> loadBalancers) {
Set<RoutingId> routingIds = new LinkedHashSet<>();
for (List<LoadBalancer> values : loadBalancers.values()) {
for (LoadBalancer loadBalancer : values) {
for (RotationName rotation : loadBalancer.rotations()) {
routingIds.add(new RoutingId(loadBalancer.application(), rotation));
}
}
}
return Collections.unmodifiableSet(routingIds);
}
/** Compute a routing table from given policies */
private static Map<RoutingId, List<RoutingPolicy>> routingTableFrom(Map<ApplicationId, Set<RoutingPolicy>> routingPolicies) {
var flattenedPolicies = routingPolicies.values().stream().flatMap(Collection::stream).collect(Collectors.toSet());
var routingTable = new LinkedHashMap<RoutingId, List<RoutingPolicy>>();
for (var policy : flattenedPolicies) {
for (var rotation : policy.rotations()) {
var id = new RoutingId(policy.owner(), rotation);
routingTable.compute(id, (k, policies) -> {
if (policies == null) {
policies = new ArrayList<>();
}
policies.add(policy);
return policies;
});
}
}
return routingTable;
}
}
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