/**
* 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.kitesdk.morphline.solr;
import java.io.File;
import java.io.IOException;
import java.util.List;
import org.apache.solr.cloud.ZkController;
import org.apache.solr.common.cloud.Aliases;
import org.apache.solr.common.cloud.ClusterState;
import org.apache.solr.common.cloud.SolrZkClient;
import org.apache.solr.common.cloud.ZkNodeProps;
import org.apache.solr.common.cloud.ZkStateReader;
import org.apache.solr.common.util.StrUtils;
import org.apache.zookeeper.KeeperException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Preconditions;
import com.google.common.io.Files;
/**
* Downloads SolrCloud information from ZooKeeper.
*/
final class ZooKeeperDownloader {
private static final Logger LOG = LoggerFactory.getLogger(ZooKeeperDownloader.class);
public SolrZkClient getZkClient(String zkHost) {
if (zkHost == null) {
throw new IllegalArgumentException("zkHost must not be null");
}
SolrZkClient zkClient;
try {
zkClient = new SolrZkClient(zkHost, 30000);
} catch (Exception e) {
throw new IllegalArgumentException("Cannot connect to ZooKeeper: " + zkHost, e);
}
return zkClient;
}
/**
* Returns config value given collection name
* Borrowed heavily from Solr's ZKController.
*/
public String readConfigName(SolrZkClient zkClient, String collection)
throws KeeperException, InterruptedException {
if (collection == null) {
throw new IllegalArgumentException("collection must not be null");
}
String configName = null;
// first check for alias
byte[] aliasData = zkClient.getData(ZkStateReader.ALIASES, null, null, true);
Aliases aliases = ClusterState.load(aliasData);
String alias = aliases.getCollectionAlias(collection);
if (alias != null) {
List<String> aliasList = StrUtils.splitSmart(alias, ",", true);
if (aliasList.size() > 1) {
throw new IllegalArgumentException("collection cannot be an alias that maps to multiple collections");
}
collection = aliasList.get(0);
}
String path = ZkStateReader.COLLECTIONS_ZKNODE + "/" + collection;
if (LOG.isInfoEnabled()) {
LOG.info("Load collection config from:" + path);
}
byte[] data = zkClient.getData(path, null, null, true);
if(data != null) {
ZkNodeProps props = ZkNodeProps.load(data);
configName = props.getStr(ZkController.CONFIGNAME_PROP);
}
if (configName != null && !zkClient.exists(ZkController.CONFIGS_ZKNODE + "/" + configName, true)) {
LOG.error("Specified config does not exist in ZooKeeper:" + configName);
throw new IllegalArgumentException("Specified config does not exist in ZooKeeper:"
+ configName);
}
return configName;
}
/**
* Download and return the config directory from ZK
*/
public File downloadConfigDir(SolrZkClient zkClient, String configName, File dir)
throws IOException, InterruptedException, KeeperException {
Preconditions.checkArgument(dir.exists());
Preconditions.checkArgument(dir.isDirectory());
ZkController.downloadConfigDir(zkClient, configName, dir);
File confDir = new File(dir, "conf");
if (!confDir.isDirectory()) {
// create a temporary directory with "conf" subdir and mv the config in there. This is
// necessary because of CDH-11188; solrctl does not generate nor accept directories with e.g.
// conf/solrconfig.xml which is necessary for proper solr operation. This should work
// even if solrctl changes.
confDir = new File(Files.createTempDir().getAbsolutePath(), "conf");
confDir.getParentFile().deleteOnExit();
Files.move(dir, confDir);
dir = confDir.getParentFile();
}
verifyConfigDir(confDir);
return dir;
}
private void verifyConfigDir(File confDir) throws IOException {
File solrConfigFile = new File(confDir, "solrconfig.xml");
if (!solrConfigFile.exists()) {
throw new IOException("Detected invalid Solr config dir in ZooKeeper - Reason: File not found: "
+ solrConfigFile.getName());
}
if (!solrConfigFile.isFile()) {
throw new IOException("Detected invalid Solr config dir in ZooKeeper - Reason: Not a file: "
+ solrConfigFile.getName());
}
if (!solrConfigFile.canRead()) {
throw new IOException("Insufficient permissions to read file: " + solrConfigFile);
}
}
}