xenadmin/XenModel/Actions/SR/SrTrimAction.cs

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/* Copyright (c) Citrix Systems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAPI;
namespace XenAdmin.Actions
{
public class SrTrimAction : PureAsyncAction
{
private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
public SrTrimAction(IXenConnection connection, SR sr)
: base(connection, string.Format(Messages.ACTION_SR_TRIM_TITLE, sr.NameWithoutHost()), false)
{
SR = sr;
}
protected override void Run()
{
Description = Messages.ACTION_SR_TRIM_DESCRIPTION;
var host = SR.GetFirstAttachedStorageHost();
if (host == null)
{
log.WarnFormat("Plugin call trim.do_trim({0}) is not possible. Reason: {1}", SR.uuid, Messages.SR_TRIM_NO_STORAGE_HOST_ERROR);
Exception = new Exception(Messages.SR_TRIM_NO_STORAGE_HOST_ERROR);
return;
}
var result = false;
try
{
var args = new Dictionary<string, string> { { "sr_uuid", SR.uuid } };
Result = Host.call_plugin(Session, host.opaque_ref, "trim", "do_trim", args);
result = Result.ToLower() == "true";
}
catch (Failure failure)
{
log.WarnFormat("Plugin call trim.do_trim({0}) on {1} failed with {2}", SR.uuid, host.Name(),
failure.Message);
throw;
}
if (result)
Description = Messages.ACTION_SR_TRIM_DONE;
else
{
log.WarnFormat("Plugin call trim.do_trim({0}) on {1} failed with {2}", SR.uuid, host.Name(), Result);
var error = GetTrimError(Result);
Exception = new Exception(error ?? Messages.ERROR_UNKNOWN);
}
}
/* Example of trim output in case of exception:
<trim_response>
<key_value_pair>
<key>errcode</key>
<value>UnsupportedSRForTrim</value>
</key_value_pair>
<key_value_pair>
<key>errmsg</key>
<value>Trim on [some-uuid] not supported</value>
</key_value_pair>
</trim_response>
*/
private static string GetTrimError(string xml)
{
try
{
var doc = new XmlDocument();
doc.LoadXml(xml);
string errcode = null;
string errmsg = null;
var kvpNodes = doc.SelectNodes("/trim_response/key_value_pair");
if (kvpNodes == null)
return null;
foreach (XmlNode kvpNode in kvpNodes)
{
var keyNode = kvpNode.ChildNodes.Cast<XmlNode>().FirstOrDefault(node => node.Name == "key");
var valueNode = kvpNode.ChildNodes.Cast<XmlNode>().FirstOrDefault(node => node.Name == "value");
if (keyNode != null && valueNode != null && keyNode.InnerText == "errcode")
errcode = valueNode.InnerText;
if (keyNode != null && valueNode != null && keyNode.InnerText == "errmsg")
errmsg = valueNode.InnerText;
}
return GetErrorMessageFromResources(errcode) ?? errmsg;
}
catch (Exception e)
{
log.DebugFormat("Exception parsing xml '{0}'", xml.Substring(0, 10000));
log.Debug(e, e);
return null;
}
}
private static string GetErrorMessageFromResources(string errCode)
{
if (errCode == null)
return null;
return PropertyManager.GetFriendlyName("Message.name-" + errCode);
}
}
}