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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.nodeadmin;
import com.yahoo.component.ComponentId;
import com.yahoo.component.provider.ComponentRegistry;
import com.yahoo.concurrent.classlock.ClassLocking;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.hosted.dockerapi.Docker;
import com.yahoo.vespa.hosted.dockerapi.metrics.MetricReceiverWrapper;
import com.yahoo.vespa.hosted.node.admin.component.AdminComponent;
import com.yahoo.vespa.hosted.node.admin.config.ConfigServerConfig;
import com.yahoo.vespa.hosted.node.admin.component.DockerAdminComponent;
import com.yahoo.vespa.hosted.node.admin.provider.NodeAdminStateUpdater;
import java.io.File;
import java.util.logging.Logger;
import java.util.stream.Collectors;
/**
* NodeAdminMain is the main component of the node admin JDisc application:
* - It will read config and check its environment to figure out its responsibilities
* - It will "start" (only) the necessary components.
* - Other components MUST NOT try to start (typically in constructor) since the features
* they provide is NOT WANTED and possibly destructive, and/or the environment may be
* incompatible. For instance, trying to contact the Docker daemon too early will be
* fatal: the node admin may not have installed and started the docker daemon.
*/
public class NodeAdminMain implements AutoCloseable {
private static final Logger logger = Logger.getLogger(NodeAdminMain.class.getName());
private final ComponentRegistry<AdminComponent> adminRegistry;
private final ConfigServerConfig configServerConfig;
private final Docker docker;
private final MetricReceiverWrapper metricReceiver;
private final ClassLocking classLocking;
private AdminComponent mainAdminComponent = null;
public NodeAdminMain(ComponentRegistry<AdminComponent> adminRegistry,
ConfigServerConfig configServerConfig,
Docker docker,
MetricReceiverWrapper metricReceiver,
ClassLocking classLocking) {
this.adminRegistry = adminRegistry;
this.configServerConfig = configServerConfig;
this.docker = docker;
this.metricReceiver = metricReceiver;
this.classLocking = classLocking;
}
public static NodeAdminConfig getConfig() {
return NodeAdminConfig.fromFile(new File("/etc/vespa/node-admin.json"));
}
public void start() {
NodeAdminConfig config = getConfig();
mainAdminComponent = selectAdminComponent(config);
mainAdminComponent.enable();
}
private AdminComponent selectAdminComponent(NodeAdminConfig config) {
if (config.mainComponent == null) {
return new DockerAdminComponent(configServerConfig, docker, metricReceiver, classLocking);
}
logger.log(LogLevel.INFO, () -> {
String registeredComponentsList = adminRegistry
.allComponentsById().keySet().stream()
.map(ComponentId::stringValue)
.collect(Collectors.joining(", "));
return String.format(
"Components registered = '%s', enabled = '%s'",
registeredComponentsList,
config.mainComponent);
});
AdminComponent component = adminRegistry.getComponent(config.mainComponent);
if (component == null) {
throw new IllegalArgumentException("There is no component named '" +
config.mainComponent + "'");
}
return component;
}
@Override
public void close() {
if (mainAdminComponent != null) {
mainAdminComponent.disable();
mainAdminComponent = null;
}
}
public NodeAdminStateUpdater getNodeAdminStateUpdater() {
assert mainAdminComponent != null : "start() hasn't been called yet";
return mainAdminComponent.getNodeAdminStateUpdater();
}
}
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