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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.os;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableMap;
import com.yahoo.component.Version;
import com.yahoo.config.provision.NodeType;
import com.yahoo.vespa.curator.Lock;
import com.yahoo.vespa.hosted.provision.persistence.CuratorDatabaseClient;
import java.time.Duration;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
/**
* Thread-safe class that manages target OS versions for nodes in this repository.
*
* The target OS version for each node type is set through the /nodes/v2/upgrade REST API.
*
* @author mpolden
*/
public class OsVersions {
private static final Duration defaultCacheTtl = Duration.ofMinutes(1);
private static final Logger log = Logger.getLogger(OsVersions.class.getName());
private final CuratorDatabaseClient db;
private final Duration cacheTtl;
/**
* Target OS version is read on every request to /nodes/v2/node/[fqdn]. Cache current targets to avoid
* unnecessary ZK reads. When targets change, some nodes may need to wait for TTL until they see the new target,
* this is fine.
*/
private volatile Supplier<Map<NodeType, OsVersion>> currentTargets;
public OsVersions(CuratorDatabaseClient db) {
this(db, defaultCacheTtl);
}
OsVersions(CuratorDatabaseClient db, Duration cacheTtl) {
this.db = db;
this.cacheTtl = cacheTtl;
createCache();
}
private void createCache() {
this.currentTargets = Suppliers.memoizeWithExpiration(() -> ImmutableMap.copyOf(db.readOsVersions()),
cacheTtl.toMillis(), TimeUnit.MILLISECONDS);
}
/** Returns the current target versions for each node type */
public Map<NodeType, OsVersion> targets() {
return currentTargets.get();
}
/** Returns the current target version for given node type, if any */
public Optional<OsVersion> targetFor(NodeType type) {
return Optional.ofNullable(targets().get(type));
}
/** Remove OS target for given node type. Nodes of this type will stop receiving wanted OS version in their
* node object */
public void removeTarget(NodeType nodeType) {
try (Lock lock = db.lockOsVersions()) {
Map<NodeType, OsVersion> osVersions = db.readOsVersions();
osVersions.remove(nodeType);
db.writeOsVersions(osVersions);
createCache(); // Throw away current cache
log.info("Cleared OS target version for " + nodeType);
}
}
/** Set the target OS version for nodes of given type */
public void setTarget(NodeType nodeType, Version newTarget, boolean force) {
if (!nodeType.isDockerHost()) {
throw new IllegalArgumentException("Setting target OS version for " + nodeType + " nodes is unsupported");
}
if (newTarget.isEmpty()) {
throw new IllegalArgumentException("Invalid target version: " + newTarget.toFullString());
}
try (Lock lock = db.lockOsVersions()) {
Map<NodeType, OsVersion> osVersions = db.readOsVersions();
Optional<OsVersion> oldTarget = Optional.ofNullable(osVersions.get(nodeType));
if (oldTarget.filter(v -> v.version().equals(newTarget)).isPresent()) {
return; // Old target matches new target, nothing to do
}
if (!force && oldTarget.filter(v -> v.version().isAfter(newTarget)).isPresent()) {
throw new IllegalArgumentException("Cannot set target OS version to " + newTarget +
" without setting 'force', as it's lower than the current version: "
+ oldTarget.get().version());
}
osVersions.put(nodeType, new OsVersion(newTarget, true));
db.writeOsVersions(osVersions);
createCache(); // Throw away current cache
log.info("Set OS target version for " + nodeType + " nodes to " + newTarget.toFullString());
}
}
}
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