/**
* 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.zookeeper.test;
import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
import java.io.ByteArrayOutputStream;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import org.apache.jute.BinaryOutputArchive;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZKTestCase;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooDefs.OpCode;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.data.Id;
import org.apache.zookeeper.data.Stat;
import org.apache.zookeeper.proto.CreateRequest;
import org.apache.zookeeper.server.Request;
import org.apache.zookeeper.server.quorum.QuorumPeer;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Due to race condition or bad client code, the leader may get request from
* expired session. We need to make sure that we never allow ephmeral node
* to be created in those case, but we do allow normal node to be created.
*/
public class LeaderSessionTrackerTest extends ZKTestCase implements Watcher {
protected static final Logger LOG = LoggerFactory
.getLogger(LeaderSessionTrackerTest.class);
QuorumUtil qu;
@Before
public void setUp() throws Exception {
qu = new QuorumUtil(1);
}
@After
public void tearDown() throws Exception {
qu.shutdownAll();
}
@Test
public void testExpiredSessionWithLocalSession() throws Exception {
testCreateEphemeral(true);
}
@Test
public void testExpiredSessionWithoutLocalSession() throws Exception {
testCreateEphemeral(false);
}
/**
* When we create ephemeral node, we need to check against global
* session, so the leader never accept request from an expired session
* (that we no longer track)
*
* This is not the same as SessionInvalidationTest since session
* is not in closing state
*/
public void testCreateEphemeral(boolean localSessionEnabled) throws Exception {
QuorumUtil qu = new QuorumUtil(1);
if (localSessionEnabled) {
qu.enableLocalSession(true);
}
qu.startAll();
QuorumPeer leader = qu.getLeaderQuorumPeer();
ZooKeeper zk = new ZooKeeper(qu.getConnectString(leader),
CONNECTION_TIMEOUT, this);
CreateRequest createRequest = new CreateRequest("/impossible",
new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL.toFlag());
ByteArrayOutputStream baos = new ByteArrayOutputStream();
BinaryOutputArchive boa = BinaryOutputArchive.getArchive(baos);
createRequest.serialize(boa, "request");
ByteBuffer bb = ByteBuffer.wrap(baos.toByteArray());
// Mimic sessionId generated by follower's local session tracker
long sid = qu.getFollowerQuorumPeers().get(0).getActiveServer()
.getServerId();
long fakeSessionId = (sid << 56) + 1;
LOG.info("Fake session Id: " + Long.toHexString(fakeSessionId));
Request request = new Request(null, fakeSessionId, 0, OpCode.create,
bb, new ArrayList<Id>());
// Submit request directly to leader
leader.getActiveServer().submitRequest(request);
// Make sure that previous request is finished
zk.create("/ok", new byte[0], Ids.OPEN_ACL_UNSAFE,
CreateMode.PERSISTENT);
Stat stat = zk.exists("/impossible", null);
Assert.assertEquals("Node from fake session get created", null, stat);
}
/**
* When local session is enabled, leader will allow persistent node
* to be create for unknown session
*/
@Test
public void testCreatePersistent() throws Exception {
QuorumUtil qu = new QuorumUtil(1);
qu.enableLocalSession(true);
qu.startAll();
QuorumPeer leader = qu.getLeaderQuorumPeer();
ZooKeeper zk = new ZooKeeper(qu.getConnectString(leader),
CONNECTION_TIMEOUT, this);
CreateRequest createRequest = new CreateRequest("/success",
new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT.toFlag());
ByteArrayOutputStream baos = new ByteArrayOutputStream();
BinaryOutputArchive boa = BinaryOutputArchive.getArchive(baos);
createRequest.serialize(boa, "request");
ByteBuffer bb = ByteBuffer.wrap(baos.toByteArray());
// Mimic sessionId generated by follower's local session tracker
long sid = qu.getFollowerQuorumPeers().get(0).getActiveServer()
.getServerId();
long locallSession = (sid << 56) + 1;
LOG.info("Local session Id: " + Long.toHexString(locallSession));
Request request = new Request(null, locallSession, 0, OpCode.create,
bb, new ArrayList<Id>());
// Submit request directly to leader
leader.getActiveServer().submitRequest(request);
// Make sure that previous request is finished
zk.create("/ok", new byte[0], Ids.OPEN_ACL_UNSAFE,
CreateMode.PERSISTENT);
Stat stat = zk.exists("/success", null);
Assert.assertTrue("Request from local sesson failed", stat != null);
}
@Override
public void process(WatchedEvent event) {
}
}