mirror of
https://github.com/xcp-ng/xenadmin.git
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194 lines
8.4 KiB
C#
194 lines
8.4 KiB
C#
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/* Copyright (c) Citrix Systems Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using XenAdmin.Core;
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using XenAdmin.Network;
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using XenAPI;
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namespace XenAdmin.Actions
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{
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public abstract class HostAbstractAction : AsyncAction
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{
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private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
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protected Func<HostAbstractAction, Pool, long, long, bool> AcceptNTolChanges;
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protected Func<Pool, Host, long, long, bool> AcceptNTolChangesOnEnable;
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protected HostAbstractAction(IXenConnection connection, string title, string description,
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Func<HostAbstractAction, Pool, long, long, bool> acceptNTolChanges,
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Func<Pool, Host, long, long, bool> acceptNTolChangesOnEnable)
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: base(connection, title, description)
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{
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this.AcceptNTolChanges = acceptNTolChanges;
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this.AcceptNTolChangesOnEnable = acceptNTolChangesOnEnable;
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}
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/// <summary>
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/// Disable the host, then shut down all the VMs on it.
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/// </summary>
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protected void ShutdownVMs(bool isForReboot)
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{
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XenAPI.Host.disable(Session, Host.opaque_ref);
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try
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{
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PercentComplete = 1;
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// Count the resident VMs that are not halted
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List<VM> toShutdown = new List<VM>();
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foreach (VM vm in Connection.ResolveAll(Host.resident_VMs))
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{
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if (vm.power_state == vm_power_state.Running && !vm.is_control_domain)
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toShutdown.Add(vm);
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}
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int n = toShutdown.Count;
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if (n == 0)
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return;
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int step = 94 / n;
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int i = 0;
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foreach (VM vm in toShutdown)
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{
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Description = String.Format(
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isForReboot ? Messages.HOSTACTION_REBOOT_VM_SHUTDOWN : Messages.HOSTACTION_SHUTDOWN_VM_SHUTDOWN,
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Helpers.GetName(vm), i + 1, n);
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RelatedTask = vm.allowed_operations.Contains(vm_operations.clean_shutdown)
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? VM.async_clean_shutdown(Session, vm.opaque_ref)
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: VM.async_hard_shutdown(Session, vm.opaque_ref);
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PollToCompletion(PercentComplete, PercentComplete + step);
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PercentComplete += step;
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i++;
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}
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}
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catch (Exception e)
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{
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log.Error("Exception shutting down VMs before shutting down host.", e);
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try
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{
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// At least re-enable the host so user can manually shutdown vms
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XenAPI.Host.enable(Session, Host.opaque_ref);
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}
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catch (Exception ex)
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{
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log.Error("Exception trying to re-enable host after error shutting down VMs.", ex);
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}
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throw;
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}
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}
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/// <summary>
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/// Ensures we have at least 1 'slack' server failure. i.e. ensures ntol is such that removing 1 host from the pool
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/// (by reboot, shutdown or disable) will succeed.
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/// May throw CancelledException if the user says no.
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/// </summary>
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/// <param name="actionKind">Must be one of Evacuate, Reboot, RebootAndWait or Shutdown. Required so we can show the correct prompt.</param>
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protected void MaybeReduceNtolBeforeOp(HostActionKind actionKind)
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{
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System.Diagnostics.Trace.Assert(actionKind == HostActionKind.Reboot ||
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actionKind == HostActionKind.RebootAndWait || actionKind == HostActionKind.Shutdown||actionKind==HostActionKind.Evacuate);
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// We may need to drop ntol for this disable to succeed.
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Pool pool = Helpers.GetPoolOfOne(Host.Connection);
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if (pool != null && pool.ha_enabled)
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{
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Dictionary<XenRef<VM>, string> config = Helpers.GetVmHaRestartPrioritiesForApi(Helpers.GetVmHaRestartPriorities(pool.Connection, true));
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long max = XenAPI.Pool.ha_compute_hypothetical_max_host_failures_to_tolerate(this.Session, config);
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long currentNtol = pool.ha_host_failures_to_tolerate;
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long targetNtol = Math.Max(0, max - 1);
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if (currentNtol > targetNtol)
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{
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bool cancel = false;
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// We need to lower ntol. Ask user.
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cancel = (AcceptNTolChanges != null) ? AcceptNTolChanges(this, pool, currentNtol, targetNtol) : false;
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if (cancel)
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{
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throw new CancelledException();
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}
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// This ensures we can tolerate at least one failure - i.e. the host we're about to disable
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XenAPI.Pool.set_ha_host_failures_to_tolerate(this.Session, pool.opaque_ref, targetNtol);
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}
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}
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}
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/// <summary>
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/// Removes MAINTENANCE_MODE = true from the host's other_config, then does a Host.enable.
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/// If appropriate, then asks the user if they want to increase ntol (since hypothetical_max might have gone up).
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/// </summary>
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/// <param name="start"></param>
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/// <param name="finish"></param>
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/// <param name="queryNtolIncrease">If true, the user will be asked if they would like to increase ntol after the host enable.</param>
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protected void Enable(int start, int finish, bool queryNtolIncrease)
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{
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XenAPI.Host.remove_from_other_config(Session, Host.opaque_ref, XenAPI.Host.MAINTENANCE_MODE);
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RelatedTask = XenAPI.Host.async_enable(Session, Host.opaque_ref);
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PollToCompletion(start, finish);
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// Offer to bump ntol back up, if we can
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Pool pool = Helpers.GetPoolOfOne(Host.Connection);
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if (queryNtolIncrease && pool != null && pool.ha_enabled)
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{
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Dictionary<XenRef<VM>, string> config = Helpers.GetVmHaRestartPrioritiesForApi(Helpers.GetVmHaRestartPriorities(pool.Connection, true));
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long max = XenAPI.Pool.ha_compute_hypothetical_max_host_failures_to_tolerate(this.Session, config);
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long currentNtol = pool.ha_host_failures_to_tolerate;
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if (currentNtol < max)
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{
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bool doit = (AcceptNTolChangesOnEnable != null) ? AcceptNTolChangesOnEnable(pool,Host, currentNtol, max) : false;
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if (doit)
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{
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XenAPI.Pool.set_ha_host_failures_to_tolerate(this.Session, pool.opaque_ref, max);
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}
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}
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}
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}
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}
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public enum HostActionKind { Reboot, RebootAndWait, Evacuate, Shutdown };
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}
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