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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.zookeeper;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Inject;
import com.yahoo.cloud.config.ZookeeperServerConfig;
import com.yahoo.component.AbstractComponent;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.defaults.Defaults;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
/**
* Writes zookeeper config and starts zookeeper server.
*
* @author lulf
* @since 5.3
*/
public class ZooKeeperServer extends AbstractComponent implements Runnable {
/**
* The set of hosts which can access the ZooKeeper server in this VM, or empty
* to allow access from anywhere.
* This belongs logically to the server instance but must be static to make it accessible
* from RestrictedServerCnxnFactory, which is created by ZK through reflection.
*/
private static volatile Optional<ImmutableSet<String>> allowedClientHostnames = Optional.empty();
private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(ZooKeeperServer.class.getName());
private static final String ZOOKEEPER_JMX_LOG4J_DISABLE = "zookeeper.jmx.log4j.disable";
static final String ZOOKEEPER_JUTE_MAX_BUFFER = "jute.maxbuffer";
private final Thread zkServerThread;
private final ZookeeperServerConfig config;
ZooKeeperServer(ZookeeperServerConfig config, boolean startServer) {
this.config = config;
System.setProperty("zookeeper.jmx.log4j.disable", "true");
System.setProperty(ZOOKEEPER_JUTE_MAX_BUFFER, "" + config.juteMaxBuffer());
System.setProperty("zookeeper.serverCnxnFactory", "com.yahoo.vespa.zookeeper.RestrictedServerCnxnFactory");
writeConfigToDisk(config);
zkServerThread = new Thread(this, "zookeeper server");
if (startServer) {
zkServerThread.start();
}
}
@Inject
public ZooKeeperServer(ZookeeperServerConfig config) {
this(config, true);
}
/** Restrict access to this ZooKeeper server to the given client hosts */
public static void setAllowedClientHostnames(Collection<String> hostnames) {
allowedClientHostnames = Optional.of(ImmutableSet.copyOf(hostnames));
}
/** Returns the hosts which are allowed to access this ZooKeeper server, or empty to allow access from anywhere */
public static Optional<ImmutableSet<String>> getAllowedClientHostnames() { return allowedClientHostnames; }
private void writeConfigToDisk(ZookeeperServerConfig config) {
String cfg = transformConfigToString(config);
try (FileWriter writer = new FileWriter(Defaults.getDefaults().underVespaHome(config.zooKeeperConfigFile()))) {
writer.write(cfg);
writeMyIdFile(config);
} catch (IOException e) {
throw new RuntimeException("Error writing zookeeper config", e);
}
}
private String transformConfigToString(ZookeeperServerConfig config) {
StringBuilder sb = new StringBuilder();
sb.append("tickTime=").append(config.tickTime()).append("\n");
sb.append("initLimit=").append(config.initLimit()).append("\n");
sb.append("syncLimit=").append(config.syncLimit()).append("\n");
sb.append("maxClientCnxns=").append(config.maxClientConnections()).append("\n");
sb.append("snapCount=").append(config.snapshotCount()).append("\n");
sb.append("dataDir=").append(Defaults.getDefaults().underVespaHome(config.dataDir())).append("\n");
sb.append("clientPort=").append(config.clientPort()).append("\n");
sb.append("autopurge.purgeInterval=").append(config.autopurge().purgeInterval()).append("\n");
sb.append("autopurge.snapRetainCount=").append(config.autopurge().snapRetainCount()).append("\n");
if (config.server().size() > 1) {
ensureThisServerIsRepresented(config.myid(), config.server());
for (ZookeeperServerConfig.Server server : config.server()) {
addServerToCfg(sb, server);
}
}
return sb.toString();
}
private void writeMyIdFile(ZookeeperServerConfig config) throws IOException {
if (config.server().size() > 1) {
try (FileWriter writer = new FileWriter(Defaults.getDefaults().underVespaHome(config.myidFile()))) {
writer.write(config.myid() + "\n");
}
}
}
private void ensureThisServerIsRepresented(int myid, List<ZookeeperServerConfig.Server> servers) {
boolean found = false;
for (ZookeeperServerConfig.Server server : servers) {
if (myid == server.id()) {
found = true;
break;
}
}
if (!found) {
throw new RuntimeException("No id in zookeeper server list that corresponds to my id(" + myid + ")");
}
}
private void addServerToCfg(StringBuilder sb, ZookeeperServerConfig.Server server) {
sb.append("server.").append(server.id()).append("=").append(server.hostname()).append(":").append(server.quorumPort()).append(":").append(server.electionPort()).append("\n");
}
private void shutdown() {
zkServerThread.interrupt();
try {
zkServerThread.join();
} catch (InterruptedException e) {
log.log(LogLevel.WARNING, "Error joining server thread on shutdown", e);
}
}
@Override
public void run() {
System.setProperty(ZOOKEEPER_JMX_LOG4J_DISABLE, "true");
String[] args = new String[]{Defaults.getDefaults().underVespaHome(config.zooKeeperConfigFile())};
log.log(LogLevel.DEBUG, "Starting ZooKeeper server with config: " + args[0]);
org.apache.zookeeper.server.quorum.QuorumPeerMain.main(args);
}
@Override
public void deconstruct() {
shutdown();
super.deconstruct();
}
public ZookeeperServerConfig getConfig() { return config; }
}
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