/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.client.solrj.impl;
import java.io.IOException;
import java.lang.invoke.MethodHandles;
import java.nio.file.Path;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.cloud.Aliases;
import org.apache.solr.common.cloud.ClusterState;
import org.apache.solr.common.cloud.ZkStateReader;
import org.apache.solr.common.cloud.ZooKeeperException;
import org.apache.zookeeper.KeeperException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ZkClientClusterStateProvider implements ClusterStateProvider {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
ZkStateReader zkStateReader;
String zkHost;
int zkConnectTimeout = 10000;
int zkClientTimeout = 10000;
public ZkClientClusterStateProvider(Collection<String> zkHosts, String chroot) {
zkHost = buildZkHostString(zkHosts,chroot);
}
public ZkClientClusterStateProvider(String zkHost){
this.zkHost = zkHost;
}
@Override
public ClusterState.CollectionRef getState(String collection) {
return zkStateReader.getClusterState().getCollectionRef(collection);
}
@Override
public Set<String> liveNodes() {
return zkStateReader.getClusterState().getLiveNodes();
}
@Override
public String getAlias(String alias) {
Aliases aliases = zkStateReader.getAliases();
return aliases.getCollectionAlias(alias);
}
@Override
public Object getClusterProperty(String propertyName) {
Map<String, Object> props = zkStateReader.getClusterProperties();
return props.get(propertyName);
}
@Override
public Object getClusterProperty(String propertyName, String def) {
Map<String, Object> props = zkStateReader.getClusterProperties();
if (props.containsKey(propertyName)) {
return props.get(propertyName);
}
return def;
}
@Override
public String getCollectionName(String name) {
Aliases aliases = zkStateReader.getAliases();
if (aliases != null) {
Map<String, String> collectionAliases = aliases.getCollectionAliasMap();
if (collectionAliases != null && collectionAliases.containsKey(name)) {
name = collectionAliases.get(name);
}
}
return name;
}
/**
* Download a named config from Zookeeper to a location on the filesystem
* @param configName the name of the config
* @param downloadPath the path to write config files to
* @throws IOException if an I/O exception occurs
*/
public void downloadConfig(String configName, Path downloadPath) throws IOException {
connect();
zkStateReader.getConfigManager().downloadConfigDir(configName, downloadPath);
}
/**
* Upload a set of config files to Zookeeper and give it a name
*
* NOTE: You should only allow trusted users to upload configs. If you
* are allowing client access to zookeeper, you should protect the
* /configs node against unauthorised write access.
*
* @param configPath {@link java.nio.file.Path} to the config files
* @param configName the name of the config
* @throws IOException if an IO error occurs
*/
public void uploadConfig(Path configPath, String configName) throws IOException {
connect();
zkStateReader.getConfigManager().uploadConfigDir(configPath, configName);
}
@Override
public void connect() {
if (zkStateReader == null) {
synchronized (this) {
if (zkStateReader == null) {
ZkStateReader zk = null;
try {
zk = new ZkStateReader(zkHost, zkClientTimeout, zkConnectTimeout);
zk.createClusterStateWatchersAndUpdate();
zkStateReader = zk;
log.info("Cluster at {} ready", zkHost);
} catch (InterruptedException e) {
zk.close();
Thread.currentThread().interrupt();
throw new ZooKeeperException(SolrException.ErrorCode.SERVER_ERROR, "", e);
} catch (KeeperException e) {
zk.close();
throw new ZooKeeperException(SolrException.ErrorCode.SERVER_ERROR, "", e);
} catch (Exception e) {
if (zk != null) zk.close();
// do not wrap because clients may be relying on the underlying exception being thrown
throw e;
}
}
}
}
}
@Override
public void close() throws IOException {
if (zkStateReader != null) {
synchronized (this) {
if (zkStateReader != null)
zkStateReader.close();
zkStateReader = null;
}
}
}
static String buildZkHostString(Collection<String> zkHosts, String chroot) {
if (zkHosts == null || zkHosts.isEmpty()) {
throw new IllegalArgumentException("Cannot create CloudSearchClient without valid ZooKeeper host; none specified!");
}
StringBuilder zkBuilder = new StringBuilder();
int lastIndexValue = zkHosts.size() - 1;
int i = 0;
for (String zkHost : zkHosts) {
zkBuilder.append(zkHost);
if (i < lastIndexValue) {
zkBuilder.append(",");
}
i++;
}
if (chroot != null) {
if (chroot.startsWith("/")) {
zkBuilder.append(chroot);
} else {
throw new IllegalArgumentException(
"The chroot must start with a forward slash.");
}
}
/* Log the constructed connection string and then initialize. */
final String zkHostString = zkBuilder.toString();
log.debug("Final constructed zkHost string: " + zkHostString);
return zkHostString;
}
@Override
public String toString() {
return zkHost;
}
}