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// 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 com.cloud.agent.manager;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.nio.channels.ClosedChannelException;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import javax.inject.Inject;
import javax.naming.ConfigurationException;
import org.apache.cloudstack.framework.config.ConfigKey;
import org.apache.cloudstack.framework.config.Configurable;
import org.apache.cloudstack.framework.config.dao.ConfigurationDao;
import org.apache.cloudstack.framework.jobs.AsyncJob;
import org.apache.cloudstack.framework.jobs.AsyncJobExecutionContext;
import org.apache.cloudstack.managed.context.ManagedContextRunnable;
import org.apache.cloudstack.outofbandmanagement.dao.OutOfBandManagementDao;
import org.apache.cloudstack.utils.identity.ManagementServerNode;
import org.apache.log4j.Logger;
import org.slf4j.MDC;
import com.cloud.agent.AgentManager;
import com.cloud.agent.Listener;
import com.cloud.agent.StartupCommandProcessor;
import com.cloud.agent.api.AgentControlAnswer;
import com.cloud.agent.api.AgentControlCommand;
import com.cloud.agent.api.Answer;
import com.cloud.agent.api.CheckHealthCommand;
import com.cloud.agent.api.Command;
import com.cloud.agent.api.PingAnswer;
import com.cloud.agent.api.PingCommand;
import com.cloud.agent.api.PingRoutingCommand;
import com.cloud.agent.api.ReadyAnswer;
import com.cloud.agent.api.ReadyCommand;
import com.cloud.agent.api.SetHostParamsCommand;
import com.cloud.agent.api.ShutdownCommand;
import com.cloud.agent.api.StartupAnswer;
import com.cloud.agent.api.StartupCommand;
import com.cloud.agent.api.StartupProxyCommand;
import com.cloud.agent.api.StartupRoutingCommand;
import com.cloud.agent.api.StartupSecondaryStorageCommand;
import com.cloud.agent.api.StartupStorageCommand;
import com.cloud.agent.api.UnsupportedAnswer;
import com.cloud.agent.transport.Request;
import com.cloud.agent.transport.Response;
import com.cloud.alert.AlertManager;
import com.cloud.dc.ClusterVO;
import com.cloud.dc.DataCenterVO;
import com.cloud.dc.HostPodVO;
import com.cloud.dc.dao.ClusterDao;
import com.cloud.dc.dao.DataCenterDao;
import com.cloud.dc.dao.HostPodDao;
import com.cloud.exception.AgentUnavailableException;
import com.cloud.exception.ConnectionException;
import com.cloud.exception.OperationTimedoutException;
import com.cloud.exception.UnsupportedVersionException;
import com.cloud.ha.HighAvailabilityManager;
import com.cloud.host.Host;
import com.cloud.host.HostVO;
import com.cloud.host.Status;
import com.cloud.host.Status.Event;
import com.cloud.host.dao.HostDao;
import com.cloud.hypervisor.Hypervisor.HypervisorType;
import com.cloud.hypervisor.HypervisorGuruManager;
import com.cloud.resource.Discoverer;
import com.cloud.resource.ResourceManager;
import com.cloud.resource.ResourceState;
import com.cloud.resource.ServerResource;
import com.cloud.utils.Pair;
import com.cloud.utils.component.ManagerBase;
import com.cloud.utils.concurrency.NamedThreadFactory;
import com.cloud.utils.db.DB;
import com.cloud.utils.db.EntityManager;
import com.cloud.utils.db.QueryBuilder;
import com.cloud.utils.db.SearchCriteria.Op;
import com.cloud.utils.db.TransactionLegacy;
import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.utils.exception.HypervisorVersionChangedException;
import com.cloud.utils.exception.NioConnectionException;
import com.cloud.utils.exception.TaskExecutionException;
import com.cloud.utils.fsm.NoTransitionException;
import com.cloud.utils.fsm.StateMachine2;
import com.cloud.utils.nio.HandlerFactory;
import com.cloud.utils.nio.Link;
import com.cloud.utils.nio.NioServer;
import com.cloud.utils.nio.Task;
import com.cloud.utils.time.InaccurateClock;
/**
* Implementation of the Agent Manager. This class controls the connection to the agents.
**/
public class AgentManagerImpl extends ManagerBase implements AgentManager, HandlerFactory, Configurable {
protected static final Logger s_logger = Logger.getLogger(AgentManagerImpl.class);
protected static final Logger status_logger = Logger.getLogger(Status.class);
/**
* _agents is a ConcurrentHashMap, but it is used from within a synchronized block. This will be reported by findbugs as JLM_JSR166_UTILCONCURRENT_MONITORENTER. Maybe a
* ConcurrentHashMap is not the right thing to use here, but i'm not sure so i leave it alone.
*/
protected ConcurrentHashMap<Long, AgentAttache> _agents = new ConcurrentHashMap<Long, AgentAttache>(10007);
protected List<Pair<Integer, Listener>> _hostMonitors = new ArrayList<Pair<Integer, Listener>>(17);
protected List<Pair<Integer, Listener>> _cmdMonitors = new ArrayList<Pair<Integer, Listener>>(17);
protected List<Pair<Integer, StartupCommandProcessor>> _creationMonitors = new ArrayList<Pair<Integer, StartupCommandProcessor>>(17);
protected List<Long> _loadingAgents = new ArrayList<Long>();
protected int _monitorId = 0;
private final Lock _agentStatusLock = new ReentrantLock();
@Inject
protected EntityManager _entityMgr;
protected NioServer _connection;
@Inject
protected HostDao _hostDao = null;
@Inject
protected OutOfBandManagementDao outOfBandManagementDao;
@Inject
protected DataCenterDao _dcDao = null;
@Inject
protected HostPodDao _podDao = null;
@Inject
protected ConfigurationDao _configDao = null;
@Inject
protected ClusterDao _clusterDao = null;
@Inject
protected HighAvailabilityManager _haMgr = null;
@Inject
protected AlertManager _alertMgr = null;
@Inject
protected HypervisorGuruManager _hvGuruMgr;
protected int _retry = 2;
protected long _nodeId = -1;
protected ExecutorService _executor;
protected ThreadPoolExecutor _connectExecutor;
protected ScheduledExecutorService _directAgentExecutor;
protected ScheduledExecutorService _cronJobExecutor;
protected ScheduledExecutorService _monitorExecutor;
private int _directAgentThreadCap;
protected StateMachine2<Status, Status.Event, Host> _statusStateMachine = Status.getStateMachine();
private final ConcurrentHashMap<Long, Long> _pingMap = new ConcurrentHashMap<Long, Long>(10007);
@Inject
ResourceManager _resourceMgr;
protected final ConfigKey<Integer> Workers = new ConfigKey<Integer>("Advanced", Integer.class, "workers", "5",
"Number of worker threads handling remote agent connections.", false);
protected final ConfigKey<Integer> Port = new ConfigKey<Integer>("Advanced", Integer.class, "port", "8250", "Port to listen on for remote agent connections.", false);
protected final ConfigKey<Integer> PingInterval = new ConfigKey<Integer>("Advanced", Integer.class, "ping.interval", "60",
"Interval to send application level pings to make sure the connection is still working", false);
protected final ConfigKey<Float> PingTimeout = new ConfigKey<Float>("Advanced", Float.class, "ping.timeout", "2.5",
"Multiplier to ping.interval before announcing an agent has timed out", true);
protected final ConfigKey<Integer> AlertWait = new ConfigKey<Integer>("Advanced", Integer.class, "alert.wait", "1800",
"Seconds to wait before alerting on a disconnected agent", true);
protected final ConfigKey<Integer> DirectAgentLoadSize = new ConfigKey<Integer>("Advanced", Integer.class, "direct.agent.load.size", "16",
"The number of direct agents to load each time", false);
protected final ConfigKey<Integer> DirectAgentPoolSize = new ConfigKey<Integer>("Advanced", Integer.class, "direct.agent.pool.size", "500",
"Default size for DirectAgentPool", false);
protected final ConfigKey<Float> DirectAgentThreadCap = new ConfigKey<Float>("Advanced", Float.class, "direct.agent.thread.cap", "1",
"Percentage (as a value between 0 and 1) of direct.agent.pool.size to be used as upper thread cap for a single direct agent to process requests", false);
protected final ConfigKey<Boolean> CheckTxnBeforeSending = new ConfigKey<Boolean>(
"Developer",
Boolean.class,
"check.txn.before.sending.agent.commands",
"false",
"This parameter allows developers to enable a check to see if a transaction wraps commands that are sent to the resource. This is not to be enabled on production systems.",
true);
@Override
public boolean configure(final String name, final Map<String, Object> params) throws ConfigurationException {
s_logger.info("Ping Timeout is " + PingTimeout.value());
final int threads = DirectAgentLoadSize.value();
_nodeId = ManagementServerNode.getManagementServerId();
s_logger.info("Configuring AgentManagerImpl. management server node id(msid): " + _nodeId);
final long lastPing = (System.currentTimeMillis() >> 10) - (long) (PingTimeout.value() * PingInterval.value());
_hostDao.markHostsAsDisconnected(_nodeId, lastPing);
registerForHostEvents(new BehindOnPingListener(), true, true, false);
registerForHostEvents(new SetHostParamsListener(), true, true, false);
_executor = new ThreadPoolExecutor(threads, threads, 60l, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(), new NamedThreadFactory("AgentTaskPool"));
_connectExecutor = new ThreadPoolExecutor(100, 500, 60l, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(), new NamedThreadFactory("AgentConnectTaskPool"));
// allow core threads to time out even when there are no items in the queue
_connectExecutor.allowCoreThreadTimeOut(true);
_connection = new NioServer("AgentManager", Port.value(), Workers.value() + 10, this);
s_logger.info("Listening on " + Port.value() + " with " + Workers.value() + " workers");
// executes all agent commands other than cron and ping
_directAgentExecutor = new ScheduledThreadPoolExecutor(DirectAgentPoolSize.value(), new NamedThreadFactory("DirectAgent"));
// executes cron and ping agent commands
_cronJobExecutor = new ScheduledThreadPoolExecutor(DirectAgentPoolSize.value(), new NamedThreadFactory("DirectAgentCronJob"));
s_logger.debug("Created DirectAgentAttache pool with size: " + DirectAgentPoolSize.value());
_directAgentThreadCap = Math.round(DirectAgentPoolSize.value() * DirectAgentThreadCap.value()) + 1; // add 1 to always make the value > 0
_monitorExecutor = new ScheduledThreadPoolExecutor(1, new NamedThreadFactory("AgentMonitor"));
return true;
}
protected long getTimeout() {
return (long) (PingTimeout.value() * PingInterval.value());
}
@Override
public Task create(final Task.Type type, final Link link, final byte[] data) {
return new AgentHandler(type, link, data);
}
@Override
public int registerForHostEvents(final Listener listener, final boolean connections, final boolean commands, final boolean priority) {
synchronized (_hostMonitors) {
_monitorId++;
if (connections) {
if (priority) {
_hostMonitors.add(0, new Pair<Integer, Listener>(_monitorId, listener));
} else {
_hostMonitors.add(new Pair<Integer, Listener>(_monitorId, listener));
}
}
if (commands) {
if (priority) {
_cmdMonitors.add(0, new Pair<Integer, Listener>(_monitorId, listener));
} else {
_cmdMonitors.add(new Pair<Integer, Listener>(_monitorId, listener));
}
}
if (s_logger.isDebugEnabled()) {
s_logger.debug("Registering listener " + listener.getClass().getSimpleName() + " with id " + _monitorId);
}
return _monitorId;
}
}
@Override
public int registerForInitialConnects(final StartupCommandProcessor creator, final boolean priority) {
synchronized (_hostMonitors) {
_monitorId++;
if (priority) {
_creationMonitors.add(0, new Pair<Integer, StartupCommandProcessor>(_monitorId, creator));
} else {
_creationMonitors.add(new Pair<Integer, StartupCommandProcessor>(_monitorId, creator));
}
return _monitorId;
}
}
@Override
public void unregisterForHostEvents(final int id) {
s_logger.debug("Deregistering " + id);
_hostMonitors.remove(id);
}
private AgentControlAnswer handleControlCommand(final AgentAttache attache, final AgentControlCommand cmd) {
AgentControlAnswer answer = null;
for (final Pair<Integer, Listener> listener : _cmdMonitors) {
answer = listener.second().processControlCommand(attache.getId(), cmd);
if (answer != null) {
return answer;
}
}
s_logger.warn("No handling of agent control command: " + cmd + " sent from " + attache.getId());
return new AgentControlAnswer(cmd);
}
public void handleCommands(final AgentAttache attache, final long sequence, final Command[] cmds) {
for (final Pair<Integer, Listener> listener : _cmdMonitors) {
final boolean processed = listener.second().processCommands(attache.getId(), sequence, cmds);
if (s_logger.isTraceEnabled()) {
s_logger.trace("SeqA " + attache.getId() + "-" + sequence + ": " + (processed ? "processed" : "not processed") + " by " + listener.getClass());
}
}
}
public void notifyAnswersToMonitors(final long agentId, final long seq, final Answer[] answers) {
for (final Pair<Integer, Listener> listener : _cmdMonitors) {
listener.second().processAnswers(agentId, seq, answers);
}
}
public AgentAttache findAttache(final long hostId) {
AgentAttache attache = null;
synchronized (_agents) {
attache = _agents.get(hostId);
}
return attache;
}
@Override
public Answer sendTo(final Long dcId, final HypervisorType type, final Command cmd) {
final List<ClusterVO> clusters = _clusterDao.listByDcHyType(dcId, type.toString());
int retry = 0;
for (final ClusterVO cluster : clusters) {
final List<HostVO> hosts = _resourceMgr.listAllUpAndEnabledHosts(Host.Type.Routing, cluster.getId(), null, dcId);
for (final HostVO host : hosts) {
retry++;
if (retry > _retry) {
return null;
}
Answer answer = null;
try {
final long targetHostId = _hvGuruMgr.getGuruProcessedCommandTargetHost(host.getId(), cmd);
answer = easySend(targetHostId, cmd);
} catch (final Exception e) {
}
if (answer != null) {
return answer;
}
}
}
return null;
}
protected int getPingInterval() {
return PingInterval.value();
}
@Override
public Answer send(final Long hostId, final Command cmd) throws AgentUnavailableException, OperationTimedoutException {
final Commands cmds = new Commands(Command.OnError.Stop);
cmds.addCommand(cmd);
send(hostId, cmds, cmd.getWait());
final Answer[] answers = cmds.getAnswers();
if (answers != null && !(answers[0] instanceof UnsupportedAnswer)) {
return answers[0];
}
if (answers != null && answers[0] instanceof UnsupportedAnswer) {
s_logger.warn("Unsupported Command: " + answers[0].getDetails());
return answers[0];
}
return null;
}
@DB
protected boolean noDbTxn() {
final TransactionLegacy txn = TransactionLegacy.currentTxn();
return !txn.dbTxnStarted();
}
private static void tagCommand(final Command cmd) {
final AsyncJobExecutionContext context = AsyncJobExecutionContext.getCurrent();
if (context != null && context.getJob() != null) {
final AsyncJob job = context.getJob();
if (job.getRelated() != null && !job.getRelated().isEmpty()) {
cmd.setContextParam("job", "job-" + job.getRelated() + "/" + "job-" + job.getId());
} else {
cmd.setContextParam("job", "job-" + job.getId());
}
}
if (MDC.get("logcontextid") != null && !MDC.get("logcontextid").isEmpty()) {
cmd.setContextParam("logid", MDC.get("logcontextid"));
}
}
/**
* @param commands
* @return
*/
private Command[] checkForCommandsAndTag(final Commands commands) {
final Command[] cmds = commands.toCommands();
assert cmds.length > 0 : "Ask yourself this about a hundred times. Why am I sending zero length commands?";
setEmptyAnswers(commands, cmds);
for (final Command cmd : cmds) {
tagCommand(cmd);
}
return cmds;
}
/**
* @param commands
* @param cmds
*/
private void setEmptyAnswers(final Commands commands, final Command[] cmds) {
if (cmds.length == 0) {
commands.setAnswers(new Answer[0]);
}
}
@Override
public Answer[] send(final Long hostId, final Commands commands, int timeout) throws AgentUnavailableException, OperationTimedoutException {
assert hostId != null : "Who's not checking the agent id before sending? ... (finger wagging)";
if (hostId == null) {
throw new AgentUnavailableException(-1);
}
if (timeout <= 0) {
timeout = Wait.value();
}
if (CheckTxnBeforeSending.value()) {
if (!noDbTxn()) {
throw new CloudRuntimeException("We do not allow transactions to be wrapped around commands sent to be executed on remote agents. "
+ "We cannot predict how long it takes a command to complete. "
+ "The transaction may be rolled back because the connection took too long.");
}
} else {
assert noDbTxn() : "I know, I know. Why are we so strict as to not allow txn across an agent call? ... Why are we so cruel ... Why are we such a dictator .... Too bad... Sorry...but NO AGENT COMMANDS WRAPPED WITHIN DB TRANSACTIONS!";
}
final Command[] cmds = checkForCommandsAndTag(commands);
final AgentAttache agent = getAttache(hostId);
if (agent == null || agent.isClosed()) {
throw new AgentUnavailableException("agent not logged into this management server", hostId);
}
final Request req = new Request(hostId, agent.getName(), _nodeId, cmds, commands.stopOnError(), true);
req.setSequence(agent.getNextSequence());
final Answer[] answers = agent.send(req, timeout);
notifyAnswersToMonitors(hostId, req.getSequence(), answers);
commands.setAnswers(answers);
return answers;
}
protected Status investigate(final AgentAttache agent) {
final Long hostId = agent.getId();
final HostVO host = _hostDao.findById(hostId);
if (host != null && host.getType() != null && !host.getType().isVirtual()) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("checking if agent (" + hostId + ") is alive");
}
final Answer answer = easySend(hostId, new CheckHealthCommand());
if (answer != null && answer.getResult()) {
final Status status = Status.Up;
if (s_logger.isDebugEnabled()) {
s_logger.debug("agent (" + hostId + ") responded to checkHeathCommand, reporting that agent is " + status);
}
return status;
}
return _haMgr.investigate(hostId);
}
return Status.Alert;
}
protected AgentAttache getAttache(final Long hostId) throws AgentUnavailableException {
if (hostId == null) {
return null;
}
final AgentAttache agent = findAttache(hostId);
if (agent == null) {
s_logger.debug("Unable to find agent for " + hostId);
throw new AgentUnavailableException("Unable to find agent ", hostId);
}
return agent;
}
@Override
public long send(final Long hostId, final Commands commands, final Listener listener) throws AgentUnavailableException {
final AgentAttache agent = getAttache(hostId);
if (agent.isClosed()) {
throw new AgentUnavailableException("Agent " + agent.getId() + " is closed", agent.getId());
}
final Command[] cmds = checkForCommandsAndTag(commands);
final Request req = new Request(hostId, agent.getName(), _nodeId, cmds, commands.stopOnError(), true);
req.setSequence(agent.getNextSequence());
agent.send(req, listener);
return req.getSequence();
}
public void removeAgent(final AgentAttache attache, final Status nextState) {
if (attache == null) {
return;
}
final long hostId = attache.getId();
if (s_logger.isDebugEnabled()) {
s_logger.debug("Remove Agent : " + hostId);
}
AgentAttache removed = null;
boolean conflict = false;
synchronized (_agents) {
removed = _agents.remove(hostId);
if (removed != null && removed != attache) {
conflict = true;
_agents.put(hostId, removed);
removed = attache;
}
}
if (conflict) {
s_logger.debug("Agent for host " + hostId + " is created when it is being disconnected");
}
if (removed != null) {
removed.disconnect(nextState);
}
for (final Pair<Integer, Listener> monitor : _hostMonitors) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Sending Disconnect to listener: " + monitor.second().getClass().getName());
}
monitor.second().processDisconnect(hostId, nextState);
}
}
@Override
public void notifyMonitorsOfNewlyAddedHost(long hostId) {
for (final Pair<Integer, Listener> monitor : _hostMonitors) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Sending host added to listener: " + monitor.second().getClass().getSimpleName());
}
monitor.second().processHostAdded(hostId);
}
}
protected AgentAttache notifyMonitorsOfConnection(final AgentAttache attache, final StartupCommand[] cmd, final boolean forRebalance) throws ConnectionException {
final long hostId = attache.getId();
final HostVO host = _hostDao.findById(hostId);
for (final Pair<Integer, Listener> monitor : _hostMonitors) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Sending Connect to listener: " + monitor.second().getClass().getSimpleName());
}
for (int i = 0; i < cmd.length; i++) {
try {
monitor.second().processConnect(host, cmd[i], forRebalance);
} catch (final Exception e) {
if (e instanceof ConnectionException) {
final ConnectionException ce = (ConnectionException) e;
if (ce.isSetupError()) {
s_logger.warn("Monitor " + monitor.second().getClass().getSimpleName() + " says there is an error in the connect process for " + hostId +
" due to " + e.getMessage());
handleDisconnectWithoutInvestigation(attache, Event.AgentDisconnected, true, true);
throw ce;
} else {
s_logger.info("Monitor " + monitor.second().getClass().getSimpleName() + " says not to continue the connect process for " + hostId +
" due to " + e.getMessage());
handleDisconnectWithoutInvestigation(attache, Event.ShutdownRequested, true, true);
return attache;
}
} else if (e instanceof HypervisorVersionChangedException) {
handleDisconnectWithoutInvestigation(attache, Event.ShutdownRequested, true, true);
throw new CloudRuntimeException("Unable to connect " + attache.getId(), e);
} else {
s_logger.error("Monitor " + monitor.second().getClass().getSimpleName() + " says there is an error in the connect process for " + hostId +
" due to " + e.getMessage(), e);
handleDisconnectWithoutInvestigation(attache, Event.AgentDisconnected, true, true);
throw new CloudRuntimeException("Unable to connect " + attache.getId(), e);
}
}
}
}
final Long dcId = host.getDataCenterId();
final ReadyCommand ready = new ReadyCommand(dcId, host.getId());
final Answer answer = easySend(hostId, ready);
if (answer == null || !answer.getResult()) {
// this is tricky part for secondary storage
// make it as disconnected, wait for secondary storage VM to be up
// return the attache instead of null, even it is disconnectede
handleDisconnectWithoutInvestigation(attache, Event.AgentDisconnected, true, true);
}
agentStatusTransitTo(host, Event.Ready, _nodeId);
attache.ready();
return attache;
}
@Override
public boolean start() {
startDirectlyConnectedHosts();
if (_connection != null) {
try {
_connection.start();
} catch (final NioConnectionException e) {
s_logger.error("Error when connecting to the NioServer!", e);
}
}
_monitorExecutor.scheduleWithFixedDelay(new MonitorTask(), PingInterval.value(), PingInterval.value(), TimeUnit.SECONDS);
return true;
}
public void startDirectlyConnectedHosts() {
final List<HostVO> hosts = _resourceMgr.findDirectlyConnectedHosts();
for (final HostVO host : hosts) {
loadDirectlyConnectedHost(host, false);
}
}
private ServerResource loadResourcesWithoutHypervisor(final HostVO host) {
final String resourceName = host.getResource();
ServerResource resource = null;
try {
final Class<?> clazz = Class.forName(resourceName);
final Constructor<?> constructor = clazz.getConstructor();
resource = (ServerResource) constructor.newInstance();
} catch (final ClassNotFoundException e) {
s_logger.warn("Unable to find class " + host.getResource(), e);
} catch (final InstantiationException e) {
s_logger.warn("Unablet to instantiate class " + host.getResource(), e);
} catch (final IllegalAccessException e) {
s_logger.warn("Illegal access " + host.getResource(), e);
} catch (final SecurityException e) {
s_logger.warn("Security error on " + host.getResource(), e);
} catch (final NoSuchMethodException e) {
s_logger.warn("NoSuchMethodException error on " + host.getResource(), e);
} catch (final IllegalArgumentException e) {
s_logger.warn("IllegalArgumentException error on " + host.getResource(), e);
} catch (final InvocationTargetException e) {
s_logger.warn("InvocationTargetException error on " + host.getResource(), e);
}
if (resource != null) {
_hostDao.loadDetails(host);
final HashMap<String, Object> params = new HashMap<String, Object>(host.getDetails().size() + 5);
params.putAll(host.getDetails());
params.put("guid", host.getGuid());
params.put("zone", Long.toString(host.getDataCenterId()));
if (host.getPodId() != null) {
params.put("pod", Long.toString(host.getPodId()));
}
if (host.getClusterId() != null) {
params.put("cluster", Long.toString(host.getClusterId()));
String guid = null;
final ClusterVO cluster = _clusterDao.findById(host.getClusterId());
if (cluster.getGuid() == null) {
guid = host.getDetail("pool");
} else {
guid = cluster.getGuid();
}
if (guid != null && !guid.isEmpty()) {
params.put("pool", guid);
}
}
params.put("ipaddress", host.getPrivateIpAddress());
params.put("secondary.storage.vm", "false");
try {
resource.configure(host.getName(), params);
} catch (final ConfigurationException e) {
s_logger.warn("Unable to configure resource due to " + e.getMessage());
return null;
}
if (!resource.start()) {
s_logger.warn("Unable to start the resource");
return null;
}
}
return resource;
}
@Override
public void rescan() {
}
protected boolean loadDirectlyConnectedHost(final HostVO host, final boolean forRebalance) {
boolean initialized = false;
ServerResource resource = null;
try {
// load the respective discoverer
final Discoverer discoverer = _resourceMgr.getMatchingDiscover(host.getHypervisorType());
if (discoverer == null) {
s_logger.info("Could not to find a Discoverer to load the resource: " + host.getId() + " for hypervisor type: " + host.getHypervisorType());
resource = loadResourcesWithoutHypervisor(host);
} else {
resource = discoverer.reloadResource(host);
}
if (resource == null) {
s_logger.warn("Unable to load the resource: " + host.getId());
return false;
}
initialized = true;
} finally {
if (!initialized) {
if (host != null) {
agentStatusTransitTo(host, Event.AgentDisconnected, _nodeId);
}
}
}
if (forRebalance) {
tapLoadingAgents(host.getId(), TapAgentsAction.Add);
final Host h = _resourceMgr.createHostAndAgent(host.getId(), resource, host.getDetails(), false, null, true);
tapLoadingAgents(host.getId(), TapAgentsAction.Del);
return h == null ? false : true;
} else {
_executor.execute(new SimulateStartTask(host.getId(), resource, host.getDetails()));
return true;
}
}
protected AgentAttache createAttacheForDirectConnect(final Host host, final ServerResource resource) throws ConnectionException {
s_logger.debug("create DirectAgentAttache for " + host.getId());
final DirectAgentAttache attache = new DirectAgentAttache(this, host.getId(), host.getName(), resource, host.isInMaintenanceStates());
AgentAttache old = null;
synchronized (_agents) {
old = _agents.put(host.getId(), attache);
}
if (old != null) {
old.disconnect(Status.Removed);
}
return attache;
}
@Override
public boolean stop() {
if (_connection != null) {
_connection.stop();
}
s_logger.info("Disconnecting agents: " + _agents.size());
synchronized (_agents) {
for (final AgentAttache agent : _agents.values()) {
final HostVO host = _hostDao.findById(agent.getId());
if (host == null) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Cant not find host " + agent.getId());
}
} else {
if (!agent.forForward()) {
agentStatusTransitTo(host, Event.ManagementServerDown, _nodeId);
}
}
}
}
_connectExecutor.shutdownNow();
_monitorExecutor.shutdownNow();
return true;
}
protected boolean handleDisconnectWithoutInvestigation(final AgentAttache attache, final Status.Event event, final boolean transitState, final boolean removeAgent) {
final long hostId = attache.getId();
s_logger.info("Host " + hostId + " is disconnecting with event " + event);
Status nextStatus = null;
final HostVO host = _hostDao.findById(hostId);
if (host == null) {
s_logger.warn("Can't find host with " + hostId);
nextStatus = Status.Removed;
} else {
final Status currentStatus = host.getStatus();
if (currentStatus == Status.Down || currentStatus == Status.Alert || currentStatus == Status.Removed) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Host " + hostId + " is already " + currentStatus);
}
nextStatus = currentStatus;
} else {
try {
nextStatus = currentStatus.getNextStatus(event);
} catch (final NoTransitionException e) {
final String err = "Cannot find next status for " + event + " as current status is " + currentStatus + " for agent " + hostId;
s_logger.debug(err);
throw new CloudRuntimeException(err);
}
if (s_logger.isDebugEnabled()) {
s_logger.debug("The next status of agent " + hostId + "is " + nextStatus + ", current status is " + currentStatus);
}
}
}
if (s_logger.isDebugEnabled()) {
s_logger.debug("Deregistering link for " + hostId + " with state " + nextStatus);
}
removeAgent(attache, nextStatus);
// update the DB
if (host != null && transitState) {
disconnectAgent(host, event, _nodeId);
}
return true;
}
protected boolean handleDisconnectWithInvestigation(final AgentAttache attache, Status.Event event) {
final long hostId = attache.getId();
HostVO host = _hostDao.findById(hostId);
if (host != null) {
Status nextStatus = null;
try {
nextStatus = host.getStatus().getNextStatus(event);
} catch (final NoTransitionException ne) {
/*
* Agent may be currently in status of Down, Alert, Removed, namely there is no next status for some events. Why this can happen? Ask God not me. I hate there was
* no piece of comment for code handling race condition. God knew what race condition the code dealt with!
*/
s_logger.debug("Caught exception while getting agent's next status", ne);
}
if (nextStatus == Status.Alert) {
/* OK, we are going to the bad status, let's see what happened */
s_logger.info("Investigating why host " + hostId + " has disconnected with event " + event);
Status determinedState = investigate(attache);
// if state cannot be determined do nothing and bail out
if (determinedState == null) {
if ((System.currentTimeMillis() >> 10) - host.getLastPinged() > AlertWait.value()) {
s_logger.warn("Agent " + hostId + " state cannot be determined for more than " + AlertWait + "(" + AlertWait.value() + ") seconds, will go to Alert state");
determinedState = Status.Alert;
} else {
s_logger.warn("Agent " + hostId + " state cannot be determined, do nothing");
return false;
}
}
final Status currentStatus = host.getStatus();
s_logger.info("The agent from host " + hostId + " state determined is " + determinedState);
if (determinedState == Status.Down) {
final String message = "Host is down: " + host.getId() + "-" + host.getName() + ". Starting HA on the VMs";
s_logger.error(message);
if (host.getType() != Host.Type.SecondaryStorage && host.getType() != Host.Type.ConsoleProxy) {
_alertMgr.sendAlert(AlertManager.AlertType.ALERT_TYPE_HOST, host.getDataCenterId(), host.getPodId(), "Host down, " + host.getId(), message);
}
event = Status.Event.HostDown;
} else if (determinedState == Status.Up) {
/* Got ping response from host, bring it back */
s_logger.info("Agent is determined to be up and running");
agentStatusTransitTo(host, Status.Event.Ping, _nodeId);
return false;
} else if (determinedState == Status.Disconnected) {
s_logger.warn("Agent is disconnected but the host is still up: " + host.getId() + "-" + host.getName());
if (currentStatus == Status.Disconnected) {
if ((System.currentTimeMillis() >> 10) - host.getLastPinged() > AlertWait.value()) {
s_logger.warn("Host " + host.getId() + " has been disconnected past the wait time it should be disconnected.");
event = Status.Event.WaitedTooLong;
} else {
s_logger.debug("Host " + host.getId() + " has been determined to be disconnected but it hasn't passed the wait time yet.");
return false;
}
} else if (currentStatus == Status.Up) {
final DataCenterVO dcVO = _dcDao.findById(host.getDataCenterId());
final HostPodVO podVO = _podDao.findById(host.getPodId());
final String hostDesc = "name: " + host.getName() + " (id:" + host.getId() + "), availability zone: " + dcVO.getName() + ", pod: " + podVO.getName();
if (host.getType() != Host.Type.SecondaryStorage && host.getType() != Host.Type.ConsoleProxy) {
_alertMgr.sendAlert(AlertManager.AlertType.ALERT_TYPE_HOST, host.getDataCenterId(), host.getPodId(), "Host disconnected, " + hostDesc,
"If the agent for host [" + hostDesc + "] is not restarted within " + AlertWait + " seconds, host will go to Alert state");
}
event = Status.Event.AgentDisconnected;
}
} else {
// if we end up here we are in alert state, send an alert
final DataCenterVO dcVO = _dcDao.findById(host.getDataCenterId());
final HostPodVO podVO = _podDao.findById(host.getPodId());
final String podName = podVO != null ? podVO.getName() : "NO POD";
final String hostDesc = "name: " + host.getName() + " (id:" + host.getId() + "), availability zone: " + dcVO.getName() + ", pod: " + podName;
_alertMgr.sendAlert(AlertManager.AlertType.ALERT_TYPE_HOST, host.getDataCenterId(), host.getPodId(), "Host in ALERT state, " + hostDesc,
"In availability zone " + host.getDataCenterId() + ", host is in alert state: " + host.getId() + "-" + host.getName());
}
} else {
s_logger.debug("The next status of agent " + host.getId() + " is not Alert, no need to investigate what happened");
}
}
handleDisconnectWithoutInvestigation(attache, event, true, true);
host = _hostDao.findById(hostId); // Maybe the host magically reappeared?
if (host != null && host.getStatus() == Status.Down) {
_haMgr.scheduleRestartForVmsOnHost(host, true);
}
return true;
}
protected class DisconnectTask extends ManagedContextRunnable {
AgentAttache _attache;
Status.Event _event;
boolean _investigate;
DisconnectTask(final AgentAttache attache, final Status.Event event, final boolean investigate) {
_attache = attache;
_event = event;
_investigate = investigate;
}
@Override
protected void runInContext() {
try {
if (_investigate == true) {
handleDisconnectWithInvestigation(_attache, _event);
} else {
handleDisconnectWithoutInvestigation(_attache, _event, true, false);
}
} catch (final Exception e) {
s_logger.error("Exception caught while handling disconnect: ", e);
}
}
}
@Override
public Answer easySend(final Long hostId, final Command cmd) {
try {
final Host h = _hostDao.findById(hostId);
if (h == null || h.getRemoved() != null) {
s_logger.debug("Host with id " + hostId + " doesn't exist");
return null;
}
final Status status = h.getStatus();
if (!status.equals(Status.Up) && !status.equals(Status.Connecting)) {
s_logger.debug("Can not send command " + cmd + " due to Host " + hostId + " is not up");
return null;
}
final Answer answer = send(hostId, cmd);
if (answer == null) {
s_logger.warn("send returns null answer");
return null;
}
if (s_logger.isDebugEnabled() && answer.getDetails() != null) {
s_logger.debug("Details from executing " + cmd.getClass() + ": " + answer.getDetails());
}
return answer;
} catch (final AgentUnavailableException e) {
s_logger.warn(e.getMessage());
return null;
} catch (final OperationTimedoutException e) {
s_logger.warn("Operation timed out: " + e.getMessage());
return null;
} catch (final Exception e) {
s_logger.warn("Exception while sending", e);
return null;
}
}
@Override
public Answer[] send(final Long hostId, final Commands cmds) throws AgentUnavailableException, OperationTimedoutException {
int wait = 0;
for (final Command cmd : cmds) {
if (cmd.getWait() > wait) {
wait = cmd.getWait();
}
}
return send(hostId, cmds, wait);
}
@Override
public boolean reconnect(final long hostId) {
HostVO host;
host = _hostDao.findById(hostId);
if (host == null || host.getRemoved() != null) {
s_logger.warn("Unable to find host " + hostId);
return false;
}
if (host.getStatus() == Status.Disconnected) {
s_logger.info("Host is already disconnected, no work to be done");
return true;
}
if (host.getStatus() != Status.Up && host.getStatus() != Status.Alert && host.getStatus() != Status.Rebalancing) {
s_logger.info("Unable to disconnect host because it is not in the correct state: host=" + hostId + "; Status=" + host.getStatus());
return false;
}
final AgentAttache attache = findAttache(hostId);
if (attache == null) {
s_logger.info("Unable to disconnect host because it is not connected to this server: " + hostId);
return false;
}
disconnectWithoutInvestigation(attache, Event.ShutdownRequested);
return true;
}
@Override
public void notifyMonitorsOfHostAboutToBeRemoved(long hostId) {
for (final Pair<Integer, Listener> monitor : _hostMonitors) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Sending host about to be removed to listener: " + monitor.second().getClass().getSimpleName());
}
monitor.second().processHostAboutToBeRemoved(hostId);
}
}
@Override
public void notifyMonitorsOfRemovedHost(long hostId, long clusterId) {
for (final Pair<Integer, Listener> monitor : _hostMonitors) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Sending host removed to listener: " + monitor.second().getClass().getSimpleName());
}
monitor.second().processHostRemoved(hostId, clusterId);
}
}
public boolean executeUserRequest(final long hostId, final Event event) throws AgentUnavailableException {
if (event == Event.AgentDisconnected) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Received agent disconnect event for host " + hostId);
}
AgentAttache attache = null;
attache = findAttache(hostId);
if (attache != null) {
handleDisconnectWithoutInvestigation(attache, Event.AgentDisconnected, true, true);
}
return true;
} else if (event == Event.ShutdownRequested) {
return reconnect(hostId);
}
return false;
}
@Override
public boolean isAgentAttached(final long hostId) {
final AgentAttache agentAttache = findAttache(hostId);
return agentAttache != null;
}
protected AgentAttache createAttacheForConnect(final HostVO host, final Link link) throws ConnectionException {
s_logger.debug("create ConnectedAgentAttache for " + host.getId());
final AgentAttache attache = new ConnectedAgentAttache(this, host.getId(), host.getName(), link, host.isInMaintenanceStates());
link.attach(attache);
AgentAttache old = null;
synchronized (_agents) {
old = _agents.put(host.getId(), attache);
}
if (old != null) {
old.disconnect(Status.Removed);
}
return attache;
}
private AgentAttache handleConnectedAgent(final Link link, final StartupCommand[] startup, final Request request) {
AgentAttache attache = null;
ReadyCommand ready = null;
try {
final HostVO host = _resourceMgr.createHostVOForConnectedAgent(startup);
if (host != null) {
ready = new ReadyCommand(host.getDataCenterId(), host.getId());
attache = createAttacheForConnect(host, link);
attache = notifyMonitorsOfConnection(attache, startup, false);
}
} catch (final Exception e) {
s_logger.debug("Failed to handle host connection: " + e.toString());
ready = new ReadyCommand(null);
ready.setDetails(e.toString());
} finally {
if (ready == null) {
ready = new ReadyCommand(null);
}
}
try {
if (attache == null) {
final Request readyRequest = new Request(-1, -1, ready, false);
link.send(readyRequest.getBytes());
} else {
easySend(attache.getId(), ready);
}
} catch (final Exception e) {
s_logger.debug("Failed to send ready command:" + e.toString());
}
return attache;
}
protected class SimulateStartTask extends ManagedContextRunnable {
ServerResource resource;
Map<String, String> details;
long id;
public SimulateStartTask(final long id, final ServerResource resource, final Map<String, String> details) {
this.id = id;
this.resource = resource;
this.details = details;
}
@Override
protected void runInContext() {
try {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Simulating start for resource " + resource.getName() + " id " + id);
}
if (tapLoadingAgents(id, TapAgentsAction.Add)) {
try {
final AgentAttache agentattache = findAttache(id);
if (agentattache == null) {
s_logger.debug("Creating agent for host " + id);
_resourceMgr.createHostAndAgent(id, resource, details, false, null, false);
s_logger.debug("Completed creating agent for host " + id);
} else {
s_logger.debug("Agent already created in another thread for host " + id + ", ignore this");
}
} finally {
tapLoadingAgents(id, TapAgentsAction.Del);
}
} else {
s_logger.debug("Agent creation already getting processed in another thread for host " + id + ", ignore this");
}
} catch (final Exception e) {
s_logger.warn("Unable to simulate start on resource " + id + " name " + resource.getName(), e);
}
}
}
protected class HandleAgentConnectTask extends ManagedContextRunnable {
Link _link;
Command[] _cmds;
Request _request;
HandleAgentConnectTask(final Link link, final Command[] cmds, final Request request) {
_link = link;
_cmds = cmds;
_request = request;
}
@Override
protected void runInContext() {
_request.logD("Processing the first command ");
final StartupCommand[] startups = new StartupCommand[_cmds.length];
for (int i = 0; i < _cmds.length; i++) {
startups[i] = (StartupCommand) _cmds[i];
}
final AgentAttache attache = handleConnectedAgent(_link, startups, _request);
if (attache == null) {
s_logger.warn("Unable to create attache for agent: " + _request);
}
}
}
protected void connectAgent(final Link link, final Command[] cmds, final Request request) {
// send startupanswer to agent in the very beginning, so agent can move on without waiting for the answer for an undetermined time, if we put this logic into another
// thread pool.
final StartupAnswer[] answers = new StartupAnswer[cmds.length];
Command cmd;
for (int i = 0; i < cmds.length; i++) {
cmd = cmds[i];
if (cmd instanceof StartupRoutingCommand || cmd instanceof StartupProxyCommand || cmd instanceof StartupSecondaryStorageCommand ||
cmd instanceof StartupStorageCommand) {
answers[i] = new StartupAnswer((StartupCommand) cmds[i], 0, getPingInterval());
break;
}
}
Response response = null;
response = new Response(request, answers[0], _nodeId, -1);
try {
link.send(response.toBytes());
} catch (final ClosedChannelException e) {
s_logger.debug("Failed to send startupanswer: " + e.toString());
}
_connectExecutor.execute(new HandleAgentConnectTask(link, cmds, request));
}
public class AgentHandler extends Task {
public AgentHandler(final Task.Type type, final Link link, final byte[] data) {
super(type, link, data);
}
protected void processRequest(final Link link, final Request request) {
final AgentAttache attache = (AgentAttache) link.attachment();
final Command[] cmds = request.getCommands();
Command cmd = cmds[0];
boolean logD = true;
if (attache == null) {
if (!(cmd instanceof StartupCommand)) {
s_logger.warn("Throwing away a request because it came through as the first command on a connect: " + request);
} else {
// submit the task for execution
request.logD("Scheduling the first command ");
connectAgent(link, cmds, request);
}
return;
}
final long hostId = attache.getId();
final String hostName = attache.getName();
if (s_logger.isDebugEnabled()) {
if (cmd instanceof PingRoutingCommand) {
logD = false;
s_logger.debug("Ping from " + hostId + "(" + hostName + ")");
s_logger.trace("SeqA " + hostId + "-" + request.getSequence() + ": Processing " + request);
} else if (cmd instanceof PingCommand) {
logD = false;
s_logger.debug("Ping from " + hostId + "(" + hostName + ")");
s_logger.trace("SeqA " + hostId + "-" + request.getSequence() + ": Processing " + request);
} else {
s_logger.debug("SeqA " + hostId + "-" + request.getSequence() + ": Processing " + request);
}
}
final Answer[] answers = new Answer[cmds.length];
for (int i = 0; i < cmds.length; i++) {
cmd = cmds[i];
Answer answer = null;
try {
if (cmd instanceof StartupRoutingCommand) {
final StartupRoutingCommand startup = (StartupRoutingCommand) cmd;
answer = new StartupAnswer(startup, attache.getId(), getPingInterval());
} else if (cmd instanceof StartupProxyCommand) {
final StartupProxyCommand startup = (StartupProxyCommand) cmd;
answer = new StartupAnswer(startup, attache.getId(), getPingInterval());
} else if (cmd instanceof StartupSecondaryStorageCommand) {
final StartupSecondaryStorageCommand startup = (StartupSecondaryStorageCommand) cmd;
answer = new StartupAnswer(startup, attache.getId(), getPingInterval());
} else if (cmd instanceof StartupStorageCommand) {
final StartupStorageCommand startup = (StartupStorageCommand) cmd;
answer = new StartupAnswer(startup, attache.getId(), getPingInterval());
} else if (cmd instanceof ShutdownCommand) {
final ShutdownCommand shutdown = (ShutdownCommand) cmd;
final String reason = shutdown.getReason();
s_logger.info("Host " + attache.getId() + " has informed us that it is shutting down with reason " + reason + " and detail " +
shutdown.getDetail());
if (reason.equals(ShutdownCommand.Update)) {
// disconnectWithoutInvestigation(attache, Event.UpdateNeeded);
throw new CloudRuntimeException("Agent update not implemented");
} else if (reason.equals(ShutdownCommand.Requested)) {
disconnectWithoutInvestigation(attache, Event.ShutdownRequested);
}
return;
} else if (cmd instanceof AgentControlCommand) {
answer = handleControlCommand(attache, (AgentControlCommand) cmd);
} else {
handleCommands(attache, request.getSequence(), new Command[] { cmd });
if (cmd instanceof PingCommand) {
final long cmdHostId = ((PingCommand) cmd).getHostId();
// if the router is sending a ping, verify the
// gateway was pingable
if (cmd instanceof PingRoutingCommand) {
final boolean gatewayAccessible = ((PingRoutingCommand) cmd).isGatewayAccessible();
final HostVO host = _hostDao.findById(Long.valueOf(cmdHostId));
if (host != null) {
if (!gatewayAccessible) {
// alert that host lost connection to
// gateway (cannot ping the default route)
final DataCenterVO dcVO = _dcDao.findById(host.getDataCenterId());
final HostPodVO podVO = _podDao.findById(host.getPodId());
final String hostDesc =
"name: " + host.getName() + " (id:" + host.getId() + "), availability zone: " + dcVO.getName() + ", pod: "
+ podVO.getName();
_alertMgr.sendAlert(AlertManager.AlertType.ALERT_TYPE_ROUTING, host.getDataCenterId(), host.getPodId(),
"Host lost connection to gateway, " + hostDesc, "Host [" + hostDesc +
"] lost connection to gateway (default route) and is possibly having network connection issues.");
} else {
_alertMgr.clearAlert(AlertManager.AlertType.ALERT_TYPE_ROUTING, host.getDataCenterId(), host.getPodId());
}
} else {
s_logger.debug("Not processing " + PingRoutingCommand.class.getSimpleName() + " for agent id=" + cmdHostId +
"; can't find the host in the DB");
}
}
answer = new PingAnswer((PingCommand) cmd);
} else if (cmd instanceof ReadyAnswer) {
final HostVO host = _hostDao.findById(attache.getId());
if (host == null) {
if (s_logger.isDebugEnabled()) {
s_logger.debug("Cant not find host " + attache.getId());
}
}
answer = new Answer(cmd);
} else {
answer = new Answer(cmd);
}
}
} catch (final Throwable th) {
s_logger.warn("Caught: ", th);
answer = new Answer(cmd, false, th.getMessage());
}
answers[i] = answer;
}
final Response response = new Response(request, answers, _nodeId, attache.getId());
if (s_logger.isDebugEnabled()) {
if (logD) {
s_logger.debug("SeqA " + attache.getId() + "-" + response.getSequence() + ": Sending " + response);
} else {
s_logger.trace("SeqA " + attache.getId() + "-" + response.getSequence() + ": Sending " + response);
}
}
try {
link.send(response.toBytes());
} catch (final ClosedChannelException e) {
s_logger.warn("Unable to send response because connection is closed: " + response);
}
}
protected void processResponse(final Link link, final Response response) {
final AgentAttache attache = (AgentAttache) link.attachment();
if (attache == null) {
s_logger.warn("Unable to process: " + response);
} else if (!attache.processAnswers(response.getSequence(), response)) {
s_logger.info("Host " + attache.getId() + " - Seq " + response.getSequence() + ": Response is not processed: " + response);
}
}
@Override
protected void doTask(final Task task) throws TaskExecutionException {
final TransactionLegacy txn = TransactionLegacy.open(TransactionLegacy.CLOUD_DB);
try {
final Type type = task.getType();
if (type == Task.Type.DATA) {
final byte[] data = task.getData();
try {
final Request event = Request.parse(data);
if (event instanceof Response) {
processResponse(task.getLink(), (Response) event);
} else {
processRequest(task.getLink(), event);
}
} catch (final UnsupportedVersionException e) {
s_logger.warn(e.getMessage());
// upgradeAgent(task.getLink(), data, e.getReason());
} catch (final ClassNotFoundException e) {
final String message = String.format("Exception occured when executing taks! Error '%s'", e.getMessage());
s_logger.error(message);
throw new TaskExecutionException(message, e);
}
} else if (type == Task.Type.CONNECT) {
} else if (type == Task.Type.DISCONNECT) {
final Link link = task.getLink();
final AgentAttache attache = (AgentAttache) link.attachment();
if (attache != null) {
disconnectWithInvestigation(attache, Event.AgentDisconnected);
} else {
s_logger.info("Connection from " + link.getIpAddress() + " closed but no cleanup was done.");
link.close();
link.terminated();
}
}
} finally {
txn.close();
}
}
}
protected AgentManagerImpl() {
}
public boolean tapLoadingAgents(final Long hostId, final TapAgentsAction action) {
synchronized (_loadingAgents) {
if (action == TapAgentsAction.Add) {
if (_loadingAgents.contains(hostId)) {
return false;
} else {
_loadingAgents.add(hostId);
}
} else if (action == TapAgentsAction.Del) {
_loadingAgents.remove(hostId);
} else if (action == TapAgentsAction.Contains) {
return _loadingAgents.contains(hostId);
} else {
throw new CloudRuntimeException("Unkonwn TapAgentsAction " + action);
}
}
return true;
}
@Override
public boolean agentStatusTransitTo(final HostVO host, final Status.Event e, final long msId) {
try {
_agentStatusLock.lock();
if (status_logger.isDebugEnabled()) {
final ResourceState state = host.getResourceState();
final StringBuilder msg = new StringBuilder("Transition:");
msg.append("[Resource state = ").append(state);
msg.append(", Agent event = ").append(e.toString());
msg.append(", Host id = ").append(host.getId()).append(", name = " + host.getName()).append("]");
status_logger.debug(msg);
}
host.setManagementServerId(msId);
try {
return _statusStateMachine.transitTo(host, e, host.getId(), _hostDao);
} catch (final NoTransitionException e1) {
status_logger.debug("Cannot transit agent status with event " + e + " for host " + host.getId() + ", name=" + host.getName() +
", mangement server id is " + msId);
throw new CloudRuntimeException("Cannot transit agent status with event " + e + " for host " + host.getId() + ", mangement server id is " + msId + "," +
e1.getMessage());
}
} finally {
_agentStatusLock.unlock();
}
}
public boolean disconnectAgent(final HostVO host, final Status.Event e, final long msId) {
host.setDisconnectedOn(new Date());
if (e.equals(Status.Event.Remove)) {
host.setGuid(null);
host.setClusterId(null);
}
return agentStatusTransitTo(host, e, msId);
}
protected void disconnectWithoutInvestigation(final AgentAttache attache, final Status.Event event) {
_executor.submit(new DisconnectTask(attache, event, false));
}
public void disconnectWithInvestigation(final AgentAttache attache, final Status.Event event) {
_executor.submit(new DisconnectTask(attache, event, true));
}
protected boolean isHostOwnerSwitched(final long hostId) {
final HostVO host = _hostDao.findById(hostId);
if (host == null) {
s_logger.warn("Can't find the host " + hostId);
return false;
}
return isHostOwnerSwitched(host);
}
protected boolean isHostOwnerSwitched(final HostVO host) {
if (host.getStatus() == Status.Up && host.getManagementServerId() != null && host.getManagementServerId() != _nodeId) {
return true;
}
return false;
}
private void disconnectInternal(final long hostId, final Status.Event event, final boolean invstigate) {
final AgentAttache attache = findAttache(hostId);
if (attache != null) {
if (!invstigate) {
disconnectWithoutInvestigation(attache, event);
} else {
disconnectWithInvestigation(attache, event);
}
} else {
/* Agent is still in connecting process, don't allow to disconnect right away */
if (tapLoadingAgents(hostId, TapAgentsAction.Contains)) {
s_logger.info("Host " + hostId + " is being loaded so no disconnects needed.");
return;
}
final HostVO host = _hostDao.findById(hostId);
if (host != null && host.getRemoved() == null) {
disconnectAgent(host, event, _nodeId);
}
}
}
public void disconnectWithInvestigation(final long hostId, final Status.Event event) {
disconnectInternal(hostId, event, true);
}
@Override
public void disconnectWithoutInvestigation(final long hostId, final Status.Event event) {
disconnectInternal(hostId, event, false);
}
@Override
public boolean handleDirectConnectAgent(final Host host, final StartupCommand[] cmds, final ServerResource resource,
final boolean forRebalance, boolean newHost) throws ConnectionException {
AgentAttache attache;
attache = createAttacheForDirectConnect(host, resource);
final StartupAnswer[] answers = new StartupAnswer[cmds.length];
for (int i = 0; i < answers.length; i++) {
answers[i] = new StartupAnswer(cmds[i], attache.getId(), PingInterval.value());
}
attache.process(answers);
if (newHost) {
notifyMonitorsOfNewlyAddedHost(host.getId());
}
attache = notifyMonitorsOfConnection(attache, cmds, forRebalance);
return attache != null;
}
@Override
public void pullAgentToMaintenance(final long hostId) {
final AgentAttache attache = findAttache(hostId);
if (attache != null) {
attache.setMaintenanceMode(true);
// Now cancel all of the commands except for the active one.
attache.cancelAllCommands(Status.Disconnected, false);
}
}
@Override
public void pullAgentOutMaintenance(final long hostId) {
final AgentAttache attache = findAttache(hostId);
if (attache != null) {
attache.setMaintenanceMode(false);
}
}
public ScheduledExecutorService getDirectAgentPool() {
return _directAgentExecutor;
}
public ScheduledExecutorService getCronJobPool() {
return _cronJobExecutor;
}
public int getDirectAgentThreadCap() {
return _directAgentThreadCap;
}
public Long getAgentPingTime(final long agentId) {
return _pingMap.get(agentId);
}
public void pingBy(final long agentId) {
// Update PingMap with the latest time if agent entry exists in the PingMap
if (_pingMap.replace(agentId, InaccurateClock.getTimeInSeconds()) == null) {
s_logger.info("PingMap for agent: " + agentId + " will not be updated because agent is no longer in the PingMap");
}
}
protected class MonitorTask extends ManagedContextRunnable {
@Override
protected void runInContext() {
s_logger.trace("Agent Monitor is started.");
try {
final List<Long> behindAgents = findAgentsBehindOnPing();
for (final Long agentId : behindAgents) {
final QueryBuilder<HostVO> sc = QueryBuilder.create(HostVO.class);
sc.and(sc.entity().getId(), Op.EQ, agentId);
final HostVO h = sc.find();
if (h != null) {
final ResourceState resourceState = h.getResourceState();
if (resourceState == ResourceState.Disabled || resourceState == ResourceState.Maintenance || resourceState == ResourceState.ErrorInMaintenance) {
/*
* Host is in non-operation state, so no investigation and direct put agent to Disconnected
*/
status_logger.debug("Ping timeout but agent " + agentId + " is in resource state of " + resourceState + ", so no investigation");
disconnectWithoutInvestigation(agentId, Event.ShutdownRequested);
} else {
final HostVO host = _hostDao.findById(agentId);
if (host != null && (host.getType() == Host.Type.ConsoleProxy || host.getType() == Host.Type.SecondaryStorageVM
|| host.getType() == Host.Type.SecondaryStorageCmdExecutor)) {
s_logger.warn("Disconnect agent for CPVM/SSVM due to physical connection close. host: " + host.getId());
disconnectWithoutInvestigation(agentId, Event.ShutdownRequested);
} else {
status_logger.debug("Ping timeout for agent " + agentId + ", do invstigation");
disconnectWithInvestigation(agentId, Event.PingTimeout);
}
}
}
}
final QueryBuilder<HostVO> sc = QueryBuilder.create(HostVO.class);
sc.and(sc.entity().getResourceState(), Op.IN, ResourceState.PrepareForMaintenance, ResourceState.ErrorInMaintenance);
final List<HostVO> hosts = sc.list();
for (final HostVO host : hosts) {
if (_resourceMgr.checkAndMaintain(host.getId())) {
final DataCenterVO dcVO = _dcDao.findById(host.getDataCenterId());
final HostPodVO podVO = _podDao.findById(host.getPodId());
final String hostDesc = "name: " + host.getName() + " (id:" + host.getId() + "), availability zone: " + dcVO.getName() + ", pod: " + podVO.getName();
_alertMgr.sendAlert(AlertManager.AlertType.ALERT_TYPE_HOST, host.getDataCenterId(), host.getPodId(), "Migration Complete for host " + hostDesc, "Host ["
+ hostDesc + "] is ready for maintenance");
}
}
} catch (final Throwable th) {
s_logger.error("Caught the following exception: ", th);
}
s_logger.trace("Agent Monitor is leaving the building!");
}
protected List<Long> findAgentsBehindOnPing() {
final List<Long> agentsBehind = new ArrayList<Long>();
final long cutoffTime = InaccurateClock.getTimeInSeconds() - getTimeout();
for (final Map.Entry<Long, Long> entry : _pingMap.entrySet()) {
if (entry.getValue() < cutoffTime) {
agentsBehind.add(entry.getKey());
}
}
if (agentsBehind.size() > 0) {
s_logger.info("Found the following agents behind on ping: " + agentsBehind);
}
return agentsBehind;
}
}
protected class BehindOnPingListener implements Listener {
@Override
public boolean isRecurring() {
return true;
}
@Override
public boolean processAnswers(final long agentId, final long seq, final Answer[] answers) {
return false;
}
@Override
public boolean processCommands(final long agentId, final long seq, final Command[] commands) {
final boolean processed = false;
for (final Command cmd : commands) {
if (cmd instanceof PingCommand) {
pingBy(agentId);
}
}
return processed;
}
@Override
public AgentControlAnswer processControlCommand(final long agentId, final AgentControlCommand cmd) {
return null;
}
@Override
public void processHostAdded(long hostId) {
}
@Override
public void processConnect(final Host host, final StartupCommand cmd, final boolean forRebalance) {
if (host.getType().equals(Host.Type.TrafficMonitor) || host.getType().equals(Host.Type.SecondaryStorage)) {
return;
}
// NOTE: We don't use pingBy here because we're initiating.
_pingMap.put(host.getId(), InaccurateClock.getTimeInSeconds());
}
@Override
public boolean processDisconnect(final long agentId, final Status state) {
_pingMap.remove(agentId);
return true;
}
@Override
public void processHostAboutToBeRemoved(long hostId) {
}
@Override
public void processHostRemoved(long hostId, long clusterId) {
}
@Override
public boolean processTimeout(final long agentId, final long seq) {
return true;
}
@Override
public int getTimeout() {
return -1;
}
}
@Override
public String getConfigComponentName() {
return AgentManager.class.getSimpleName();
}
@Override
public ConfigKey<?>[] getConfigKeys() {
return new ConfigKey<?>[] { CheckTxnBeforeSending, Workers, Port, PingInterval, PingTimeout, Wait, AlertWait, DirectAgentLoadSize, DirectAgentPoolSize,
DirectAgentThreadCap };
}
protected class SetHostParamsListener implements Listener {
@Override
public boolean isRecurring() {
return false;
}
@Override
public boolean processAnswers(final long agentId, final long seq, final Answer[] answers) {
return false;
}
@Override
public boolean processCommands(final long agentId, final long seq, final Command[] commands) {
return false;
}
@Override
public AgentControlAnswer processControlCommand(final long agentId, final AgentControlCommand cmd) {
return null;
}
@Override
public void processHostAdded(long hostId) {
}
@Override
public void processConnect(final Host host, final StartupCommand cmd, final boolean forRebalance) {
if (cmd instanceof StartupRoutingCommand) {
if (((StartupRoutingCommand)cmd).getHypervisorType() == HypervisorType.KVM || ((StartupRoutingCommand)cmd).getHypervisorType() == HypervisorType.LXC) {
Map<String, String> params = new HashMap<String, String>();
params.put("router.aggregation.command.each.timeout", _configDao.getValue("router.aggregation.command.each.timeout"));
try {
SetHostParamsCommand cmds = new SetHostParamsCommand(params);
Commands c = new Commands(cmds);
send(host.getId(), c, this);
} catch (AgentUnavailableException e) {
s_logger.debug("Failed to send host params on host: " + host.getId());
}
}
}
}
@Override
public boolean processDisconnect(final long agentId, final Status state) {
return true;
}
@Override
public void processHostAboutToBeRemoved(long hostId) {
}
@Override
public void processHostRemoved(long hostId, long clusterId) {
}
@Override
public boolean processTimeout(final long agentId, final long seq) {
return false;
}
@Override
public int getTimeout() {
return -1;
}
}
}