/**
* 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.hadoop.yarn.lib;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import org.junit.Assert;
import org.apache.hadoop.yarn.lib.ZKClient;
import org.apache.zookeeper.server.NIOServerCnxnFactory;
import org.apache.zookeeper.server.ZKDatabase;
import org.apache.zookeeper.server.ZooKeeperServer;
import org.apache.zookeeper.server.persistence.FileTxnLog;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class TestZKClient {
public static int CONNECTION_TIMEOUT = 30000;
static final File BASETEST =
new File(System.getProperty("build.test.dir", "target/zookeeper-build"));
protected String hostPort = "127.0.0.1:2000";
protected int maxCnxns = 0;
protected NIOServerCnxnFactory factory = null;
protected ZooKeeperServer zks;
protected File tmpDir = null;
public static String send4LetterWord(String host, int port, String cmd)
throws IOException
{
Socket sock = new Socket(host, port);
BufferedReader reader = null;
try {
OutputStream outstream = sock.getOutputStream();
outstream.write(cmd.getBytes());
outstream.flush();
// this replicates NC - close the output stream before reading
sock.shutdownOutput();
reader =
new BufferedReader(
new InputStreamReader(sock.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
return sb.toString();
} finally {
sock.close();
if (reader != null) {
reader.close();
}
}
}
public static boolean waitForServerDown(String hp, long timeout) {
long start = System.currentTimeMillis();
while (true) {
try {
String host = hp.split(":")[0];
int port = Integer.parseInt(hp.split(":")[1]);
send4LetterWord(host, port, "stat");
} catch (IOException e) {
return true;
}
if (System.currentTimeMillis() > start + timeout) {
break;
}
try {
Thread.sleep(250);
} catch (InterruptedException e) {
// ignore
}
}
return false;
}
public static boolean waitForServerUp(String hp, long timeout) {
long start = System.currentTimeMillis();
while (true) {
try {
String host = hp.split(":")[0];
int port = Integer.parseInt(hp.split(":")[1]);
// if there are multiple hostports, just take the first one
String result = send4LetterWord(host, port, "stat");
if (result.startsWith("Zookeeper version:")) {
return true;
}
} catch (IOException e) {
}
if (System.currentTimeMillis() > start + timeout) {
break;
}
try {
Thread.sleep(250);
} catch (InterruptedException e) {
// ignore
}
}
return false;
}
public static File createTmpDir(File parentDir) throws IOException {
File tmpFile = File.createTempFile("test", ".junit", parentDir);
// don't delete tmpFile - this ensures we don't attempt to create
// a tmpDir with a duplicate name
File tmpDir = new File(tmpFile + ".dir");
Assert.assertFalse(tmpDir.exists());
Assert.assertTrue(tmpDir.mkdirs());
return tmpDir;
}
@Before
public void setUp() throws IOException, InterruptedException {
System.setProperty("zookeeper.preAllocSize", "100");
FileTxnLog.setPreallocSize(100 * 1024);
if (!BASETEST.exists()) {
BASETEST.mkdirs();
}
File dataDir = createTmpDir(BASETEST);
zks = new ZooKeeperServer(dataDir, dataDir, 3000);
final int PORT = Integer.parseInt(hostPort.split(":")[1]);
if (factory == null) {
factory = new NIOServerCnxnFactory();
factory.configure(new InetSocketAddress(PORT), maxCnxns);
}
factory.startup(zks);
Assert.assertTrue("waiting for server up",
waitForServerUp("127.0.0.1:" + PORT,
CONNECTION_TIMEOUT));
}
@After
public void tearDown() throws IOException, InterruptedException {
if (zks != null) {
ZKDatabase zkDb = zks.getZKDatabase();
factory.shutdown();
try {
zkDb.close();
} catch (IOException ie) {
}
final int PORT = Integer.parseInt(hostPort.split(":")[1]);
Assert.assertTrue("waiting for server down",
waitForServerDown("127.0.0.1:" + PORT,
CONNECTION_TIMEOUT));
}
}
@Test
public void testzkClient() throws Exception {
test("/some/test");
}
private void test(String testClient) throws Exception {
ZKClient client = new ZKClient(hostPort);
client.registerService("/nodemanager", "hostPort");
client.unregisterService("/nodemanager");
}
}