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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.handler;
import ai.vespa.metrics.ContainerMetrics;
import com.yahoo.component.annotation.Inject;
import com.yahoo.container.QrSearchersConfig;
import com.yahoo.container.core.VipStatusConfig;
import com.yahoo.container.jdisc.state.StateMonitor;
import com.yahoo.jdisc.Metric;
import java.util.Map;
import java.util.stream.Collectors;
/**
* A component which keeps track of whether or not this container instance should receive traffic
* and respond that it is in good health.
*
* This is multithread safe.
*
* @author Steinar Knutsen
* @author bratseth
*/
public class VipStatus {
private final Metric metric;
private final ClustersStatus clustersStatus;
private final StateMonitor healthState;
/** If this is non-null, its value decides whether this container is in rotation */
private Boolean rotationOverride = null;
private final boolean initiallyInRotation;
/** The current state of this */
private boolean currentlyInRotation;
private final Object mutex = new Object();
/** For testing */
public VipStatus() {
this(new ClustersStatus());
}
/** For testing */
public VipStatus(QrSearchersConfig dispatchers) {
this(dispatchers, new ClustersStatus());
}
/** For testing */
public VipStatus(ClustersStatus clustersStatus) {
this(new QrSearchersConfig.Builder().build(), clustersStatus);
}
/** For testing */
public VipStatus(QrSearchersConfig dispatchers, ClustersStatus clustersStatus) {
this(dispatchers, new VipStatusConfig.Builder().build(), clustersStatus, StateMonitor.createForTesting(), new NullMetric());
}
@Inject
public VipStatus(QrSearchersConfig dispatchers,
VipStatusConfig vipStatusConfig,
ClustersStatus clustersStatus,
StateMonitor healthState,
Metric metric) {
this.clustersStatus = clustersStatus;
this.healthState = healthState;
this.metric = metric;
initiallyInRotation = vipStatusConfig.initiallyInRotation();
clustersStatus.setClusters(dispatchers.searchcluster().stream().map(c -> c.name()).collect(Collectors.toSet()));
updateCurrentlyInRotation();
}
/**
* Explicitly set this container in or out of rotation
*
* @param inRotation true to set this in rotation regardless of any clusters and of the default value,
* false to set it out, and null to make this decision using the usual cluster-dependent logic
*/
public void setInRotation(Boolean inRotation) {
synchronized (mutex) {
rotationOverride = inRotation;
updateCurrentlyInRotation();
}
}
/** Note that a cluster (which influences up/down state) is up */
public void addToRotation(String clusterIdentifier) {
clustersStatus.setUp(clusterIdentifier);
updateCurrentlyInRotation();
}
/** Note that a cluster (which influences up/down state) is down */
public void removeFromRotation(String clusterIdentifier) {
clustersStatus.setDown(clusterIdentifier);
updateCurrentlyInRotation();
}
private void updateCurrentlyInRotation() {
synchronized (mutex) {
if (rotationOverride != null) {
currentlyInRotation = rotationOverride;
} else {
if (healthState.status() == StateMonitor.Status.up) {
currentlyInRotation = clustersStatus.containerShouldReceiveTraffic(ClustersStatus.Require.ONE);
}
else if (healthState.status() == StateMonitor.Status.initializing) {
currentlyInRotation = clustersStatus.containerShouldReceiveTraffic(ClustersStatus.Require.ALL)
&& initiallyInRotation;
}
else {
currentlyInRotation = clustersStatus.containerShouldReceiveTraffic(ClustersStatus.Require.ALL);
}
}
// Change to/from 'up' when appropriate but don't change 'initializing' to 'down'
if (currentlyInRotation)
healthState.status(StateMonitor.Status.up);
else if (healthState.status() == StateMonitor.Status.up)
healthState.status(StateMonitor.Status.down);
metric.set(ContainerMetrics.IN_SERVICE.baseName(), currentlyInRotation ? 1 : 0, metric.createContext(Map.of()));
}
}
/** Returns whether this container should receive traffic at this time */
public boolean isInRotation() {
synchronized (mutex) {
return currentlyInRotation;
}
}
private static class NullMetric implements Metric {
@Override
public void set(String key, Number val, Context ctx) { }
@Override
public void add(String key, Number val, Context ctx) { }
@Override
public Context createContext(Map<String, ?> properties) {
return new NullContext();
}
private static class NullContext implements Context {
}
}
}
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