plugins/hypervisors/simulator/src/main/java/com/cloud/ha/SimulatorInvestigator.java

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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,
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package com.cloud.ha;

import java.util.List;

import javax.inject.Inject;

import org.apache.log4j.Logger;
import org.apache.cloudstack.ha.HAManager;

import com.cloud.agent.AgentManager;
import com.cloud.agent.api.Answer;
import com.cloud.agent.api.CheckOnHostCommand;
import com.cloud.agent.api.CheckVirtualMachineAnswer;
import com.cloud.agent.api.CheckVirtualMachineCommand;
import com.cloud.exception.AgentUnavailableException;
import com.cloud.exception.OperationTimedoutException;
import com.cloud.host.Host;
import com.cloud.host.HostVO;
import com.cloud.host.Status;
import com.cloud.hypervisor.Hypervisor;
import com.cloud.hypervisor.Hypervisor.HypervisorType;
import com.cloud.resource.ResourceManager;
import com.cloud.simulator.dao.MockConfigurationDao;
import com.cloud.utils.component.AdapterBase;
import com.cloud.vm.VirtualMachine;
import com.cloud.vm.VirtualMachine.PowerState;

public class SimulatorInvestigator extends AdapterBase implements Investigator {
    private final static Logger s_logger = Logger.getLogger(SimulatorInvestigator.class);
    @Inject
    AgentManager _agentMgr;
    @Inject
    ResourceManager _resourceMgr;
    @Inject
    MockConfigurationDao _mockConfigDao;
    @Inject
    private HAManager haManager;

    protected SimulatorInvestigator() {
    }

    @Override
    public Status isAgentAlive(Host agent) {
        if (agent.getHypervisorType() != HypervisorType.Simulator) {
            return null;
        }

        if (haManager.isHAEligible(agent)) {
            return haManager.getHostStatus(agent);
        }

        CheckOnHostCommand cmd = new CheckOnHostCommand(agent);
        List<HostVO> neighbors = _resourceMgr.listHostsInClusterByStatus(agent.getClusterId(), Status.Up);
        for (HostVO neighbor : neighbors) {
            if (neighbor.getId() == agent.getId() || neighbor.getHypervisorType() != Hypervisor.HypervisorType.Simulator) {
                continue;
            }
            try {
                Answer answer = _agentMgr.easySend(neighbor.getId(), cmd);
                if (answer != null) {
                    return answer.getResult() ? Status.Up : Status.Down;
                }
            } catch (Exception e) {
                s_logger.debug("Failed to send command to host: " + neighbor.getId());
            }
        }

        return null;
    }

    @Override
    public boolean isVmAlive(VirtualMachine vm, Host host) throws UnknownVM {
        if (haManager.isHAEligible(host)) {
            return haManager.isVMAliveOnHost(host);
        }
        CheckVirtualMachineCommand cmd = new CheckVirtualMachineCommand(vm.getInstanceName());
        try {
            Answer answer = _agentMgr.send(vm.getHostId(), cmd);
            if (!answer.getResult()) {
                s_logger.debug("Unable to get vm state on " + vm.toString());
                throw new UnknownVM();
            }
            CheckVirtualMachineAnswer cvmAnswer = (CheckVirtualMachineAnswer)answer;
            s_logger.debug("Agent responded with state " + cvmAnswer.getState().toString());
            return cvmAnswer.getState() == PowerState.PowerOn;
        } catch (AgentUnavailableException e) {
            s_logger.debug("Unable to reach the agent for " + vm.toString() + ": " + e.getMessage());
            throw new UnknownVM();
        } catch (OperationTimedoutException e) {
            s_logger.debug("Operation timed out for " + vm.toString() + ": " + e.getMessage());
            throw new UnknownVM();
        }
    }
}