software/base/src/test/java/org/apache/brooklyn/entity/brooklynnode/SelectMasterEffectorTest.java - brooklyn-server - Git at Google

 /*
  * 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.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.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.entity.EntityAsserts;
 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.core.test.entity.TestApplication;
 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.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;

     @Override
     @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>(app, null, 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(TestApplication.LOCALHOST_PROVISIONER_SPEC)
             .configure(BrooklynCluster.MEMBER_SPEC, EntitySpec.create(BrooklynNode.class)
                 .impl(MockBrooklynNode.class)
                 .configure(MockBrooklynNode.HTTP_CLIENT_CALLBACK, http)));
     }

     @Override
     @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();
         EntityAsserts.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();

         EntityAsserts.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();
                 EntityAsserts.assertAttributeEquals(entity, BrooklynNode.MANAGEMENT_NODE_STATE, ManagementNodeState.MASTER);
                 EntityAsserts.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);
         EntityAsserts.assertAttributeEqualsEventually(cluster, BrooklynCluster.MASTER_NODE, (BrooklynNode)member);
         return;
     }

     public static void setManagementState(Entity entity, ManagementNodeState state) {
         entity.sensors().set(BrooklynNode.MANAGEMENT_NODE_STATE, state);
     }

     public static void setPriority(Entity entity, int priority) {
         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();
     }

 }
	/*
	* 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.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.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.entity.EntityAsserts;
	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.core.test.entity.TestApplication;
	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.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;

	@Override
	@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>(app, null, 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(TestApplication.LOCALHOST_PROVISIONER_SPEC)
	.configure(BrooklynCluster.MEMBER_SPEC, EntitySpec.create(BrooklynNode.class)
	.impl(MockBrooklynNode.class)
	.configure(MockBrooklynNode.HTTP_CLIENT_CALLBACK, http)));
	}

	@Override
	@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();
	EntityAsserts.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();

	EntityAsserts.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();
	EntityAsserts.assertAttributeEquals(entity, BrooklynNode.MANAGEMENT_NODE_STATE, ManagementNodeState.MASTER);
	EntityAsserts.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);
	EntityAsserts.assertAttributeEqualsEventually(cluster, BrooklynCluster.MASTER_NODE, (BrooklynNode)member);
	return;
	}

	public static void setManagementState(Entity entity, ManagementNodeState state) {
	entity.sensors().set(BrooklynNode.MANAGEMENT_NODE_STATE, state);
	}

	public static void setPriority(Entity entity, int priority) {
	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();
	}

	}