add vendoring with go dep

vendor/github.com/vmware/govmomi/event/processor.go

@@ -0,0 +1,195 @@
+/*
+Copyright (c) 2016 VMware, Inc. All Rights Reserved.
+
+Licensed 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, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package event
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/vmware/govmomi/property"
+	"github.com/vmware/govmomi/view"
+	"github.com/vmware/govmomi/vim25/types"
+)
+
+const latestPageProp = "latestPage"
+
+type tailInfo struct {
+	t         *eventTailer
+	obj       types.ManagedObjectReference
+	collector types.ManagedObjectReference
+}
+
+type eventProcessor struct {
+	mgr      Manager
+	pageSize int32
+	tailers  map[types.ManagedObjectReference]*tailInfo // tailers by collector ref
+	callback func(types.ManagedObjectReference, []types.BaseEvent) error
+}
+
+func newEventProcessor(mgr Manager, pageSize int32, callback func(types.ManagedObjectReference, []types.BaseEvent) error) *eventProcessor {
+	return &eventProcessor{
+		mgr:      mgr,
+		tailers:  make(map[types.ManagedObjectReference]*tailInfo),
+		callback: callback,
+		pageSize: pageSize,
+	}
+}
+
+func (p *eventProcessor) addObject(ctx context.Context, obj types.ManagedObjectReference) error {
+	filter := types.EventFilterSpec{
+		Entity: &types.EventFilterSpecByEntity{
+			Entity:    obj,
+			Recursion: types.EventFilterSpecRecursionOptionAll,
+		},
+	}
+
+	collector, err := p.mgr.CreateCollectorForEvents(ctx, filter)
+	if err != nil {
+		return fmt.Errorf("[%#v] %s", obj, err)
+	}
+
+	err = collector.SetPageSize(ctx, p.pageSize)
+	if err != nil {
+		return err
+	}
+
+	p.tailers[collector.Reference()] = &tailInfo{
+		t:         newEventTailer(),
+		obj:       obj,
+		collector: collector.Reference(),
+	}
+
+	return nil
+}
+
+func (p *eventProcessor) run(ctx context.Context, tail bool) error {
+	if len(p.tailers) == 0 {
+		return nil
+	}
+
+	var err error
+	var collectors []types.ManagedObjectReference
+	for _, t := range p.tailers {
+		collectors = append(collectors, t.collector)
+	}
+
+	if len(p.tailers) > 1 {
+		// create and populate a ListView
+		viewMgr := view.NewManager(p.mgr.Client())
+		var listView *view.ListView
+		listView, err = viewMgr.CreateListView(ctx, collectors)
+		if err != nil {
+			return err
+		}
+
+		count := 0
+		// Retrieve the property from the objects in the ListView
+		err = property.WaitForView(ctx, property.DefaultCollector(p.mgr.Client()), listView.Reference(), collectors[0], []string{latestPageProp}, func(c types.ManagedObjectReference, pc []types.PropertyChange) bool {
+			if err = p.process(c, pc); err != nil {
+				return false
+			}
+
+			count++
+			if count == len(collectors) && !tail {
+				return true
+			}
+
+			return false
+		})
+
+		return err
+	}
+
+	// only one object to follow
+	err = property.Wait(ctx, property.DefaultCollector(p.mgr.Client()), collectors[0], []string{latestPageProp}, func(pc []types.PropertyChange) bool {
+		if err = p.process(collectors[0], pc); err != nil {
+			return false
+		}
+
+		if !tail {
+			return true
+		}
+
+		return false
+	})
+
+	return err
+}
+
+func (p *eventProcessor) process(c types.ManagedObjectReference, pc []types.PropertyChange) error {
+	t := p.tailers[c]
+	if t == nil {
+		return fmt.Errorf("unknown collector %s", c.String())
+	}
+
+	for _, u := range pc {
+		if u.Name != latestPageProp {
+			continue
+		}
+
+		evs := t.t.newEvents(u.Val.(types.ArrayOfEvent).Event)
+		if len(evs) == 0 {
+			continue
+		}
+
+		if err := p.callback(t.obj, evs); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+const invalidKey = int32(-1)
+
+type eventTailer struct {
+	lastKey int32
+}
+
+func newEventTailer() *eventTailer {
+	return &eventTailer{
+		lastKey: invalidKey,
+	}
+}
+
+func (t *eventTailer) newEvents(evs []types.BaseEvent) []types.BaseEvent {
+	var ret []types.BaseEvent
+	if t.lastKey == invalidKey {
+		ret = evs
+	} else {
+		found := false
+		for i := range evs {
+			if evs[i].GetEvent().Key != t.lastKey {
+				continue
+			}
+
+			found = true
+			ret = evs[:i]
+			break
+		}
+
+		if !found {
+			ret = evs
+		}
+	}
+
+	if len(ret) > 0 {
+		t.lastKey = ret[0].GetEvent().Key
+	}
+
+	return ret
+}