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package com.github.ibole.infrastructure.cache.redis.cluster;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.PooledObjectFactory;
import org.apache.commons.pool2.impl.DefaultPooledObject;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.HostAndPort;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPubSub;
import redis.clients.jedis.JedisShardInfo;
import redis.clients.jedis.Protocol;
import redis.clients.jedis.ShardedJedis;
import redis.clients.jedis.exceptions.JedisConnectionException;
import redis.clients.util.Hashing;
import redis.clients.util.Pool;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.regex.Pattern;
/*********************************************************************************************
* .
*
*
* Copyright 2016, iBole Inc. All rights reserved.
*
*
*
*********************************************************************************************/
/**
* 基于Redis Sentinel的Redis集群(主从 and Sharding)高可用方案.
*
* Jedis不能同时支持Shareded和Sentinel，只能自己封装.
* 大部分代码copy至JedisSentinelPool和ShardedJedisPool,把单masterName改成多master,同时把Jedis改成ShardedJedis.
*
*
*/
public class ShardedJedisSentinelPool extends Pool {
public static final int MAX_RETRY_SENTINEL = 10;
protected final Logger logger = LoggerFactory.getLogger(this.getClass());
protected GenericObjectPoolConfig poolConfig;
protected int timeout = Protocol.DEFAULT_TIMEOUT;
private int sentinelRetry = 0;
protected String password;
protected int database = Protocol.DEFAULT_DATABASE;
protected Set masterListeners = new HashSet();
private volatile List currentHostMasters;
public ShardedJedisSentinelPool(List masters, Set sentinels) {
this(masters, sentinels, new GenericObjectPoolConfig(), Protocol.DEFAULT_TIMEOUT, null,
Protocol.DEFAULT_DATABASE);
}
public ShardedJedisSentinelPool(List masters, Set sentinels, String password) {
this(masters, sentinels, new GenericObjectPoolConfig(), Protocol.DEFAULT_TIMEOUT, password);
}
public ShardedJedisSentinelPool(final GenericObjectPoolConfig poolConfig, List masters,
Set sentinels) {
this(masters, sentinels, poolConfig, Protocol.DEFAULT_TIMEOUT, null, Protocol.DEFAULT_DATABASE);
}
public ShardedJedisSentinelPool(List masters, Set sentinels,
final GenericObjectPoolConfig poolConfig, int timeout, final String password) {
this(masters, sentinels, poolConfig, timeout, password, Protocol.DEFAULT_DATABASE);
}
public ShardedJedisSentinelPool(List masters, Set sentinels,
final GenericObjectPoolConfig poolConfig, final int timeout) {
this(masters, sentinels, poolConfig, timeout, null, Protocol.DEFAULT_DATABASE);
}
public ShardedJedisSentinelPool(List masters, Set sentinels,
final GenericObjectPoolConfig poolConfig, final String password) {
this(masters, sentinels, poolConfig, Protocol.DEFAULT_TIMEOUT, password);
}
public ShardedJedisSentinelPool(List masters, Set sentinels,
final GenericObjectPoolConfig poolConfig, int timeout, final String password,
final int database) {
this.poolConfig = poolConfig;
this.timeout = timeout;
this.password = password;
this.database = database;
List masterList = initSentinels(sentinels, masters);
initPool(masterList);
}
public void destroy() {
for (MasterListener m : masterListeners) {
m.shutdown();
}
super.destroy();
}
public List getCurrentHostMaster() {
return currentHostMasters;
}
private void initPool(List masters) {
if (!equals(currentHostMasters, masters)) {
StringBuffer sb = new StringBuffer();
for (HostAndPort master : masters) {
sb.append(master.toString());
sb.append(" ");
}
logger.info("Created ShardedJedisPool to master at [" + sb.toString() + "]");
List shardMasters = makeShardInfoList(masters);
initPool(poolConfig, new ShardedJedisFactory(shardMasters, Hashing.MURMUR_HASH, null));
currentHostMasters = masters;
}
}
private boolean equals(List currentShardMasters, List shardMasters) {
if (currentShardMasters != null && shardMasters != null) {
if (currentShardMasters.size() == shardMasters.size()) {
for (int i = 0; i < currentShardMasters.size(); i++) {
if (!currentShardMasters.get(i).equals(shardMasters.get(i)))
return false;
}
return true;
}
}
return false;
}
private List makeShardInfoList(List masters) {
List shardMasters = new ArrayList();
for (HostAndPort master : masters) {
JedisShardInfo jedisShardInfo =
new JedisShardInfo(master.getHost(), master.getPort(), timeout);
jedisShardInfo.setPassword(password);
shardMasters.add(jedisShardInfo);
}
return shardMasters;
}
private List initSentinels(Set sentinels, final List masters) {
Map masterMap = new HashMap();
List shardMasters = new ArrayList();
logger.info("Trying to find all master from available Sentinels...");
for (String masterName : masters) {
HostAndPort master = null;
boolean fetched = false;
while (!fetched && sentinelRetry < MAX_RETRY_SENTINEL) {
for (String sentinel : sentinels) {
final HostAndPort hap = toHostAndPort(Arrays.asList(sentinel.split(":")));
logger.info("Connecting to Sentinel " + hap);
try {
Jedis jedis = new Jedis(hap.getHost(), hap.getPort());
master = masterMap.get(masterName);
if (master == null) {
List hostAndPort = jedis.sentinelGetMasterAddrByName(masterName);
if (hostAndPort != null && hostAndPort.size() > 0) {
master = toHostAndPort(hostAndPort);
logger.info("Found Redis master at " + master);
shardMasters.add(master);
masterMap.put(masterName, master);
fetched = true;
jedis.disconnect();
break;
}
}
} catch (JedisConnectionException e) {
logger.warn("Cannot connect to sentinel running @ " + hap + ". Trying next one.");
}
}
if (null == master) {
try {
logger.error("All sentinels down, cannot determine where is " + masterName
+ " master is running... sleeping 1000ms, Will try again.");
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
fetched = false;
sentinelRetry++;
}
}
// Try MAX_RETRY_SENTINEL times.
if (!fetched && sentinelRetry >= MAX_RETRY_SENTINEL) {
logger.error("All sentinels down and try " + MAX_RETRY_SENTINEL + " times, Abort.");
throw new JedisConnectionException("Cannot connect all sentinels, Abort.");
}
}
// All shards master must been accessed.
if (masters.size() != 0 && masters.size() == shardMasters.size()) {
logger.info("Starting Sentinel listeners...");
for (String sentinel : sentinels) {
final HostAndPort hap = toHostAndPort(Arrays.asList(sentinel.split(":")));
MasterListener masterListener = new MasterListener(masters, hap.getHost(), hap.getPort());
masterListeners.add(masterListener);
masterListener.start();
}
}
return shardMasters;
}
private HostAndPort toHostAndPort(List getMasterAddrByNameResult) {
String host = getMasterAddrByNameResult.get(0);
int port = Integer.parseInt(getMasterAddrByNameResult.get(1));
return new HostAndPort(host, port);
}
/**
* PoolableObjectFactory custom impl.
*/
protected static class ShardedJedisFactory implements PooledObjectFactory {
private List shards;
private Hashing algo;
private Pattern keyTagPattern;
public ShardedJedisFactory(List shards, Hashing algo, Pattern keyTagPattern) {
this.shards = shards;
this.algo = algo;
this.keyTagPattern = keyTagPattern;
}
public PooledObject makeObject() throws Exception {
ShardedJedis jedis = new ShardedJedis(shards, algo, keyTagPattern);
return new DefaultPooledObject(jedis);
}
public void destroyObject(PooledObject pooledShardedJedis) throws Exception {
final ShardedJedis shardedJedis = pooledShardedJedis.getObject();
for (Jedis jedis : shardedJedis.getAllShards()) {
try {
try {
jedis.quit();
} catch (Exception e) {
}
jedis.disconnect();
} catch (Exception e) {
}
}
}
public boolean validateObject(PooledObject pooledShardedJedis) {
try {
ShardedJedis jedis = pooledShardedJedis.getObject();
for (Jedis shard : jedis.getAllShards()) {
if (!shard.ping().equals("PONG")) {
return false;
}
}
return true;
} catch (Exception ex) {
return false;
}
}
public void activateObject(PooledObject p) throws Exception {
}
public void passivateObject(PooledObject p) throws Exception {
}
}
protected class JedisPubSubAdapter extends JedisPubSub {
@Override
public void onMessage(String channel, String message) {}
@Override
public void onPMessage(String pattern, String channel, String message) {}
@Override
public void onPSubscribe(String pattern, int subscribedChannels) {}
@Override
public void onPUnsubscribe(String pattern, int subscribedChannels) {}
@Override
public void onSubscribe(String channel, int subscribedChannels) {}
@Override
public void onUnsubscribe(String channel, int subscribedChannels) {}
}
protected class MasterListener extends Thread {
protected List masters;
protected String host;
protected int port;
protected long subscribeRetryWaitTimeMillis = 5000;
protected Jedis jedis;
protected AtomicBoolean running = new AtomicBoolean(false);
protected MasterListener() {}
public MasterListener(List masters, String host, int port) {
this.masters = masters;
this.host = host;
this.port = port;
}
public MasterListener(List masters, String host, int port,
long subscribeRetryWaitTimeMillis) {
this(masters, host, port);
this.subscribeRetryWaitTimeMillis = subscribeRetryWaitTimeMillis;
}
public void run() {
running.set(true);
while (running.get()) {
jedis = new Jedis(host, port);
try {
jedis.subscribe(new JedisPubSubAdapter() {
@Override
public void onMessage(String channel, String message) {
logger.info("Sentinel " + host + ":" + port + " published: " + message + ".");
String[] switchMasterMsg = message.split(" ");
if (switchMasterMsg.length > 3) {
int index = masters.indexOf(switchMasterMsg[0]);
if (index >= 0) {
HostAndPort newHostMaster =
toHostAndPort(Arrays.asList(switchMasterMsg[3], switchMasterMsg[4]));
List newHostMasters = new ArrayList();
for (int i = 0; i < masters.size(); i++) {
newHostMasters.add(null);
}
Collections.copy(newHostMasters, currentHostMasters);
newHostMasters.set(index, newHostMaster);
initPool(newHostMasters);
} else {
StringBuffer sb = new StringBuffer();
for (String masterName : masters) {
sb.append(masterName);
sb.append(",");
}
logger.info("Ignoring message on +switch-master for master name "
+ switchMasterMsg[0] + ", our monitor master name are [" + sb + "]");
}
} else {
logger.error("Invalid message received on Sentinel " + host + ":" + port
+ " on channel +switch-master: " + message);
}
}
}, "+switch-master");
} catch (JedisConnectionException e) {
if (running.get()) {
logger.error("Lost connection to Sentinel at " + host + ":" + port
+ ". Sleeping 5000ms and retrying.");
try {
Thread.sleep(subscribeRetryWaitTimeMillis);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
} else {
logger.info("Unsubscribing from Sentinel at " + host + ":" + port);
}
}
}
}
public void shutdown() {
try {
logger.info("Shutting down listener on " + host + ":" + port);
running.set(false);
// This isn't good, the Jedis object is not thread safe
jedis.disconnect();
} catch (Exception e) {
logger.error("Caught exception while shutting down: " + e.getMessage());
}
}
}
}
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