plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtCheckVolumeCommandWrapper.java

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// to you under the Apache License, Version 2.0 (the
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//   http://www.apache.org/licenses/LICENSE-2.0
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package com.cloud.hypervisor.kvm.resource.wrapper;

import com.cloud.agent.api.Answer;
import com.cloud.agent.api.CheckVolumeAnswer;
import com.cloud.agent.api.CheckVolumeCommand;
import com.cloud.agent.api.to.StorageFilerTO;
import com.cloud.hypervisor.kvm.resource.LibvirtComputingResource;
import com.cloud.hypervisor.kvm.storage.KVMPhysicalDisk;
import com.cloud.hypervisor.kvm.storage.KVMStoragePool;
import com.cloud.hypervisor.kvm.storage.KVMStoragePoolManager;
import com.cloud.resource.CommandWrapper;
import com.cloud.resource.ResourceWrapper;
import com.cloud.storage.Storage;
import com.cloud.utils.exception.CloudRuntimeException;
import org.apache.cloudstack.utils.qemu.QemuImg;
import org.apache.cloudstack.utils.qemu.QemuImgException;
import org.apache.cloudstack.utils.qemu.QemuImgFile;
import org.apache.log4j.Logger;
import org.libvirt.LibvirtException;

import java.util.Map;

@ResourceWrapper(handles = CheckVolumeCommand.class)
public final class LibvirtCheckVolumeCommandWrapper extends CommandWrapper<CheckVolumeCommand, Answer, LibvirtComputingResource> {

    private static final Logger s_logger = Logger.getLogger(LibvirtCheckVolumeCommandWrapper.class);

    @Override
    public Answer execute(final CheckVolumeCommand command, final LibvirtComputingResource libvirtComputingResource) {
        String result = null;
        String srcFile = command.getSrcFile();
        StorageFilerTO storageFilerTO = command.getStorageFilerTO();
        KVMStoragePoolManager poolMgr = libvirtComputingResource.getStoragePoolMgr();
        KVMStoragePool pool = poolMgr.getStoragePool(storageFilerTO.getType(), storageFilerTO.getUuid());

        try {
            if (storageFilerTO.getType() == Storage.StoragePoolType.Filesystem ||
                    storageFilerTO.getType() == Storage.StoragePoolType.NetworkFilesystem) {
                final KVMPhysicalDisk vol = pool.getPhysicalDisk(srcFile);
                final String path = vol.getPath();
                long size = getVirtualSizeFromFile(path);
                return  new CheckVolumeAnswer(command, "", size);
            } else {
                return new Answer(command, false, "Unsupported Storage Pool");
            }

        } catch (final Exception e) {
            s_logger.error("Error while locating disk: "+ e.getMessage());
            return new Answer(command, false, result);
        }
    }

    private long getVirtualSizeFromFile(String path) {
        try {
            QemuImg qemu = new QemuImg(0);
            QemuImgFile qemuFile = new QemuImgFile(path);
            Map<String, String> info = qemu.info(qemuFile);
            if (info.containsKey(QemuImg.VIRTUAL_SIZE)) {
                return Long.parseLong(info.get(QemuImg.VIRTUAL_SIZE));
            } else {
                throw new CloudRuntimeException("Unable to determine virtual size of volume at path " + path);
            }
        } catch (QemuImgException | LibvirtException ex) {
            throw new CloudRuntimeException("Error when inspecting volume at path " + path, ex);
        }
    }
}