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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.provisioning;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.HostName;
import com.yahoo.config.provision.NodeType;
import com.yahoo.transaction.Mutex;
import com.yahoo.transaction.NestedTransaction;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeList;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.hosted.provision.lb.LoadBalancer;
import com.yahoo.vespa.hosted.provision.lb.LoadBalancerId;
import com.yahoo.vespa.hosted.provision.lb.LoadBalancerInstance;
import com.yahoo.vespa.hosted.provision.lb.LoadBalancerService;
import com.yahoo.vespa.hosted.provision.lb.Real;
import com.yahoo.vespa.hosted.provision.node.IP;
import com.yahoo.vespa.hosted.provision.persistence.CuratorDatabaseClient;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
/**
* Provides provisioning of load balancers for applications.
*
* @author mpolden
*/
public class LoadBalancerProvisioner {
private final NodeRepository nodeRepository;
private final CuratorDatabaseClient db;
private final LoadBalancerService service;
public LoadBalancerProvisioner(NodeRepository nodeRepository, LoadBalancerService service) {
this.nodeRepository = nodeRepository;
this.db = nodeRepository.database();
this.service = service;
}
/**
* Provision load balancer(s) for given application.
*
* If the application has multiple container clusters, one load balancer will be provisioned for each cluster.
*/
public Map<LoadBalancerId, LoadBalancer> provision(ApplicationId application) {
try (Mutex applicationLock = nodeRepository.lock(application)) {
try (Mutex loadBalancersLock = db.lockLoadBalancers()) {
Map<LoadBalancerId, LoadBalancer> loadBalancers = new LinkedHashMap<>();
for (Map.Entry<ClusterSpec, List<Node>> kv : activeContainers(application).entrySet()) {
LoadBalancerId id = new LoadBalancerId(application, kv.getKey().id());
LoadBalancerInstance instance = create(application, kv.getKey().id(), kv.getValue());
// Load balancer is always re-activated here to avoid reallocation if an application/cluster is
// deleted and then redeployed.
LoadBalancer loadBalancer = new LoadBalancer(id, instance, kv.getKey().rotations(), false);
loadBalancers.put(loadBalancer.id(), loadBalancer);
db.writeLoadBalancer(loadBalancer);
}
return Collections.unmodifiableMap(loadBalancers);
}
}
}
/**
* Deactivate all load balancers assigned to given application. This is a no-op if an application does not have any
* load balancer(s)
*/
public void deactivate(ApplicationId application, NestedTransaction transaction) {
try (Mutex applicationLock = nodeRepository.lock(application)) {
try (Mutex loadBalancersLock = db.lockLoadBalancers()) {
List<LoadBalancer> deactivatedLoadBalancers = nodeRepository.loadBalancers().owner(application).asList().stream()
.map(LoadBalancer::deactivate)
.collect(Collectors.toList());
db.writeLoadBalancers(deactivatedLoadBalancers, transaction);
}
}
}
private LoadBalancerInstance create(ApplicationId application, ClusterSpec.Id cluster, List<Node> nodes) {
Map<HostName, Set<String>> hostnameToIpAdresses = nodes.stream()
.collect(Collectors.toMap(node -> HostName.from(node.hostname()),
this::reachableIpAddresses));
Set<Real> reals = new LinkedHashSet<>();
hostnameToIpAdresses.forEach((hostname, ipAddresses) -> {
ipAddresses.forEach(ipAddress -> reals.add(new Real(hostname, ipAddress)));
});
return service.create(application, cluster, reals);
}
/** Returns a list of active containers for given application, grouped by cluster spec */
private Map<ClusterSpec, List<Node>> activeContainers(ApplicationId application) {
return new NodeList(nodeRepository.getNodes(NodeType.tenant, Node.State.active))
.owner(application)
.filter(node -> node.state().isAllocated())
.type(ClusterSpec.Type.container)
.asList()
.stream()
.collect(Collectors.groupingBy(n -> n.allocation().get().membership().cluster()));
}
/** Find IP addresses reachable by the load balancer service */
private Set<String> reachableIpAddresses(Node node) {
Set<String> reachable = new LinkedHashSet<>(node.ipAddresses());
// Remove addresses unreachable by the load balancer service
switch (service.protocol()) {
case ipv4:
reachable.removeIf(IP::isV6);
break;
case ipv6:
reachable.removeIf(IP::isV4);
break;
}
return reachable;
}
}
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