116 lines
3.1 KiB
Go
116 lines
3.1 KiB
Go
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/*
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Copyright (c) 2015-2017 VMware, Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package property
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import (
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"context"
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"github.com/vmware/govmomi/vim25/types"
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)
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// WaitFilter provides helpers to construct a types.CreateFilter for use with property.Wait
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type WaitFilter struct {
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types.CreateFilter
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}
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// Add a new ObjectSpec and PropertySpec to the WaitFilter
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func (f *WaitFilter) Add(obj types.ManagedObjectReference, kind string, ps []string, set ...types.BaseSelectionSpec) *WaitFilter {
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spec := types.ObjectSpec{
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Obj: obj,
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SelectSet: set,
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}
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pset := types.PropertySpec{
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Type: kind,
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PathSet: ps,
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}
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if len(ps) == 0 {
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pset.All = types.NewBool(true)
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}
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f.Spec.ObjectSet = append(f.Spec.ObjectSet, spec)
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f.Spec.PropSet = append(f.Spec.PropSet, pset)
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return f
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}
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// Wait creates a new WaitFilter and calls the specified function for each ObjectUpdate via WaitForUpdates
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func Wait(ctx context.Context, c *Collector, obj types.ManagedObjectReference, ps []string, f func([]types.PropertyChange) bool) error {
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filter := new(WaitFilter).Add(obj, obj.Type, ps)
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return WaitForUpdates(ctx, c, filter, func(updates []types.ObjectUpdate) bool {
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for _, update := range updates {
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if f(update.ChangeSet) {
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return true
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}
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}
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return false
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})
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}
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// WaitForUpdates waits for any of the specified properties of the specified managed
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// object to change. It calls the specified function for every update it
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// receives. If this function returns false, it continues waiting for
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// subsequent updates. If this function returns true, it stops waiting and
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// returns.
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//
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// To only receive updates for the specified managed object, the function
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// creates a new property collector and calls CreateFilter. A new property
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// collector is required because filters can only be added, not removed.
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//
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// The newly created collector is destroyed before this function returns (both
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// in case of success or error).
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//
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func WaitForUpdates(ctx context.Context, c *Collector, filter *WaitFilter, f func([]types.ObjectUpdate) bool) error {
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p, err := c.Create(ctx)
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if err != nil {
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return err
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}
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// Attempt to destroy the collector using the background context, as the
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// specified context may have timed out or have been cancelled.
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defer p.Destroy(context.Background())
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err = p.CreateFilter(ctx, filter.CreateFilter)
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if err != nil {
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return err
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}
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for version := ""; ; {
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res, err := p.WaitForUpdates(ctx, version)
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if err != nil {
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return err
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}
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// Retry if the result came back empty
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if res == nil {
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continue
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}
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version = res.Version
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for _, fs := range res.FilterSet {
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if f(fs.ObjectSet) {
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return nil
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}
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}
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}
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}
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