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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.provision.provisioning;
import com.yahoo.config.provision.CloudAccount;
import com.yahoo.config.provision.HostEvent;
import com.yahoo.config.provision.NodeAllocationException;
import com.yahoo.config.provision.NodeResources;
import com.yahoo.vespa.hosted.provision.Node;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import java.util.function.Predicate;
/**
* A service which supports provisioning container hosts dynamically.
*
* @author freva
*/
public interface HostProvisioner {
enum HostSharing {
/** The host must be provisioned exclusively for the applicationId */
exclusive,
/** The host must be provisioned to be shared with other applications. */
shared,
/** The client has no requirements on whether the host must be provisioned exclusively or shared. */
any
}
/**
* Schedule provisioning of a given number of hosts.
*
* @param request details of the host provision request.
* @param realHostResourcesWithinLimits predicate that returns true if the given resources are within allowed limits
* @param whenProvisioned consumer of {@link ProvisionedHost}s describing the provisioned nodes,
* the {@link Node} returned from {@link ProvisionedHost#generateHost} must be
* written to ZK immediately in case the config server goes down while waiting
* for the provisioning to finish.
* @throws NodeAllocationException if the cloud provider cannot satisfy the request
*/
void provisionHosts(HostProvisionRequest request, Predicate<NodeResources> realHostResourcesWithinLimits, Consumer<List<ProvisionedHost>> whenProvisioned) throws NodeAllocationException;
/**
* Continue provisioning of given list of Nodes.
*
* @param host the host to provision
* @return IP config for the provisioned host and its children
* @throws FatalProvisioningException if the provisioning has irrecoverably failed and the input nodes
* should be deleted from node-repo.
*/
HostIpConfig provision(Node host) throws FatalProvisioningException;
/**
* Deprovisions a given host and resources associated with it and its children (such as DNS entries).
* This method will only perform the actual deprovisioning of the host and does NOT:
* - verify whether it is safe to do
* - clean up config server references to this node or any of its children
* Therefore, this method should probably only be called for hosts that have no children.
*
* @param host host to deprovision.
*/
void deprovision(Node host);
/** Replace the root (OS) disk of hosts. Implementations of this are expected to be idempotent.
*
* @return the node objects for which updates were made
*/
default RebuildResult replaceRootDisk(Collection<Node> hosts) { return new RebuildResult(List.of(), Map.of()); }
record RebuildResult(List<Node> rebuilt, Map<Node, Exception> failed) { }
/**
* Returns the maintenance events scheduled for hosts in this zone, in given cloud accounts. Host events in the
* zone's default cloud account are always included.
*/
List<HostEvent> hostEventsIn(List<CloudAccount> cloudAccounts);
/** Returns whether flavor for given host can be upgraded to a newer generation */
boolean canUpgradeFlavor(Node host, Node child, Predicate<NodeResources> realHostResourcesWithinLimits);
}
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