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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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package org.apache.brooklyn.entity.brooklynnode;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;
import static org.testng.Assert.fail;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Callable;
import org.apache.brooklyn.api.entity.Entity;
import org.apache.brooklyn.api.entity.EntityLocal;
import org.apache.brooklyn.api.entity.EntitySpec;
import org.apache.brooklyn.api.entity.Group;
import org.apache.brooklyn.api.mgmt.ha.ManagementNodeState;
import org.apache.brooklyn.core.effector.Effectors;
import org.apache.brooklyn.core.entity.Entities;
import org.apache.brooklyn.core.feed.AttributePollHandler;
import org.apache.brooklyn.core.feed.DelegatingPollHandler;
import org.apache.brooklyn.core.feed.Poller;
import org.apache.brooklyn.core.test.BrooklynAppUnitTestSupport;
import org.apache.brooklyn.entity.brooklynnode.BrooklynCluster;
import org.apache.brooklyn.entity.brooklynnode.BrooklynClusterImpl;
import org.apache.brooklyn.entity.brooklynnode.BrooklynNode;
import org.apache.brooklyn.entity.brooklynnode.BrooklynCluster.SelectMasterEffector;
import org.apache.brooklyn.entity.brooklynnode.CallbackEntityHttpClient.Request;
import org.apache.brooklyn.entity.group.DynamicCluster;
import org.apache.brooklyn.test.EntityTestUtils;
import org.apache.brooklyn.util.collections.MutableList;
import org.apache.brooklyn.util.time.Duration;
import org.apache.http.client.methods.HttpPost;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.testng.Assert;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;
import com.google.common.base.Function;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableMap;
public class SelectMasterEffectorTest extends BrooklynAppUnitTestSupport {
private static final Logger LOG = LoggerFactory.getLogger(BrooklynClusterImpl.class);
protected BrooklynCluster cluster;
protected HttpCallback http;
protected Poller<Void> poller;
@BeforeMethod(alwaysRun=true)
public void setUp() throws Exception {
super.setUp();
// because the effector calls wait for a state change, use a separate thread to drive that
poller = new Poller<Void>((EntityLocal)app, false);
poller.scheduleAtFixedRate(
new Callable<Void>() {
@Override
public Void call() throws Exception {
masterFailoverIfNeeded();
return null;
}
},
new DelegatingPollHandler<Void>(Collections.<AttributePollHandler<? super Void>>emptyList()),
Duration.millis(20));
poller.start();
}
@Override
protected void setUpApp() {
super.setUpApp();
http = new HttpCallback();
cluster = app.createAndManageChild(EntitySpec.create(BrooklynCluster.class)
.location(app.newLocalhostProvisioningLocation())
.configure(BrooklynCluster.MEMBER_SPEC, EntitySpec.create(BrooklynNode.class)
.impl(MockBrooklynNode.class)
.configure(MockBrooklynNode.HTTP_CLIENT_CALLBACK, http)));
}
@AfterMethod(alwaysRun=true)
public void tearDown() throws Exception {
poller.stop();
super.tearDown();
}
@Test
public void testInvalidNewMasterIdFails() {
try {
selectMaster(cluster, "1234");
fail("Non-existend entity ID provided.");
} catch (Exception e) {
assertTrue(e.toString().contains("1234 is not an ID of brooklyn node in this cluster"));
}
}
@Test(groups="Integration") // because slow, due to sensor feeds
public void testSelectMasterAfterChange() {
List<Entity> nodes = makeTwoNodes();
EntityTestUtils.assertAttributeEqualsEventually(cluster, BrooklynCluster.MASTER_NODE, (BrooklynNode)nodes.get(0));
selectMaster(cluster, nodes.get(1).getId());
checkMaster(cluster, nodes.get(1));
}
@Test
public void testFindMaster() {
List<Entity> nodes = makeTwoNodes();
Assert.assertEquals(((BrooklynClusterImpl)Entities.deproxy(cluster)).findMasterChild(), nodes.get(0));
}
@Test(groups="Integration") // because slow, due to sensor feeds
public void testSelectMasterFailsAtChangeState() {
http.setFailAtStateChange(true);
List<Entity> nodes = makeTwoNodes();
EntityTestUtils.assertAttributeEqualsEventually(cluster, BrooklynCluster.MASTER_NODE, (BrooklynNode)nodes.get(0));
try {
selectMaster(cluster, nodes.get(1).getId());
fail("selectMaster should have failed");
} catch (Exception e) {
// expected
}
checkMaster(cluster, nodes.get(0));
}
private List<Entity> makeTwoNodes() {
List<Entity> nodes = MutableList.copyOf(cluster.resizeByDelta(2));
setManagementState(nodes.get(0), ManagementNodeState.MASTER);
setManagementState(nodes.get(1), ManagementNodeState.HOT_STANDBY);
return nodes;
}
private void checkMaster(Group cluster, Entity node) {
assertEquals(node.getAttribute(BrooklynNode.MANAGEMENT_NODE_STATE), ManagementNodeState.MASTER);
assertEquals(cluster.getAttribute(BrooklynCluster.MASTER_NODE), node);
for (Entity member : cluster.getMembers()) {
if (member != node) {
assertEquals(member.getAttribute(BrooklynNode.MANAGEMENT_NODE_STATE), ManagementNodeState.HOT_STANDBY);
}
assertEquals((int)member.getAttribute(MockBrooklynNode.HA_PRIORITY), 0);
}
}
private static class HttpCallback implements Function<CallbackEntityHttpClient.Request, String> {
private enum State {
INITIAL,
PROMOTED
}
private State state = State.INITIAL;
private boolean failAtStateChange;
@Override
public String apply(Request input) {
if ("/v1/server/ha/state".equals(input.getPath())) {
if (failAtStateChange) {
throw new RuntimeException("Testing failure at changing node state");
}
checkRequest(input, HttpPost.METHOD_NAME, "/v1/server/ha/state", "mode", "HOT_STANDBY");
Entity entity = input.getEntity();
EntityTestUtils.assertAttributeEquals(entity, BrooklynNode.MANAGEMENT_NODE_STATE, ManagementNodeState.MASTER);
EntityTestUtils.assertAttributeEquals(entity, MockBrooklynNode.HA_PRIORITY, 0);
setManagementState(entity, ManagementNodeState.HOT_STANDBY);
return "MASTER";
} else {
switch(state) {
case INITIAL:
checkRequest(input, HttpPost.METHOD_NAME, "/v1/server/ha/priority", "priority", "1");
state = State.PROMOTED;
setPriority(input.getEntity(), Integer.parseInt(input.getParams().get("priority")));
return "0";
case PROMOTED:
checkRequest(input, HttpPost.METHOD_NAME, "/v1/server/ha/priority", "priority", "0");
state = State.INITIAL;
setPriority(input.getEntity(), Integer.parseInt(input.getParams().get("priority")));
return "1";
default: throw new IllegalStateException("Illegal call at state " + state + ". Request = " + input.getMethod() + " " + input.getPath());
}
}
}
public void checkRequest(Request input, String methodName, String path, String key, String value) {
if (!input.getMethod().equals(methodName) || !input.getPath().equals(path)) {
throw new IllegalStateException("Request doesn't match expected state. Expected = " + input.getMethod() + " " + input.getPath() + ". " +
"Actual = " + methodName + " " + path);
}
String inputValue = input.getParams().get(key);
if(!Objects.equal(value, inputValue)) {
throw new IllegalStateException("Request doesn't match expected parameter " + methodName + " " + path + ". Parameter " + key +
" expected = " + value + ", actual = " + inputValue);
}
}
public void setFailAtStateChange(boolean failAtStateChange) {
this.failAtStateChange = failAtStateChange;
}
}
private void masterFailoverIfNeeded() {
if (!Entities.isManaged(cluster)) return;
if (cluster.getAttribute(BrooklynCluster.MASTER_NODE) == null) {
Collection<Entity> members = cluster.getMembers();
if (members.size() > 0) {
for (Entity member : members) {
if (member.getAttribute(MockBrooklynNode.HA_PRIORITY) == 1) {
masterFailover(member);
return;
}
}
masterFailover(members.iterator().next());
}
}
}
private void masterFailover(Entity member) {
LOG.debug("Master failover to " + member);
setManagementState(member, ManagementNodeState.MASTER);
EntityTestUtils.assertAttributeEqualsEventually(cluster, BrooklynCluster.MASTER_NODE, (BrooklynNode)member);
return;
}
public static void setManagementState(Entity entity, ManagementNodeState state) {
((EntityLocal)entity).sensors().set(BrooklynNode.MANAGEMENT_NODE_STATE, state);
}
public static void setPriority(Entity entity, int priority) {
((EntityLocal)entity).sensors().set(MockBrooklynNode.HA_PRIORITY, priority);
}
private void selectMaster(DynamicCluster cluster, String id) {
app.getExecutionContext().submit(Effectors.invocation(cluster, BrooklynCluster.SELECT_MASTER, ImmutableMap.of(SelectMasterEffector.NEW_MASTER_ID.getName(), id))).asTask().getUnchecked();
}
}