github.com/vmware/govmomi@v0.37.1/examples/events/main.go (about)

     1  /*
     2  Copyright (c) 2020 VMware, Inc. All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"context"
    21  	"flag"
    22  	"fmt"
    23  	"reflect"
    24  	"time"
    25  
    26  	"github.com/vmware/govmomi/event"
    27  	"github.com/vmware/govmomi/examples"
    28  	"github.com/vmware/govmomi/vim25"
    29  	"github.com/vmware/govmomi/vim25/methods"
    30  	"github.com/vmware/govmomi/vim25/types"
    31  )
    32  
    33  func main() {
    34  	// example use against simulator: go run main.go -b 8h -f
    35  	// example use against vCenter with optional event filters:
    36  	// go run main.go -url $GOVMOMI_URL -insecure $GOVMOMI_INSECURE -b 8h -f VmEvent UserLoginSessionEvent
    37  	begin := flag.Duration("b", 10*time.Minute, "Begin time") // default BeginTime is 10min ago
    38  	end := flag.Duration("e", 0, "End time")
    39  	follow := flag.Bool("f", false, "Follow event stream")
    40  
    41  	examples.Run(func(ctx context.Context, c *vim25.Client) error {
    42  		m := event.NewManager(c)
    43  
    44  		ref := c.ServiceContent.RootFolder
    45  
    46  		now, err := methods.GetCurrentTime(ctx, c) // vCenter server time (UTC)
    47  		if err != nil {
    48  			return err
    49  		}
    50  
    51  		filter := types.EventFilterSpec{
    52  			EventTypeId: flag.Args(), // e.g. VmEvent
    53  			Entity: &types.EventFilterSpecByEntity{
    54  				Entity:    ref,
    55  				Recursion: types.EventFilterSpecRecursionOptionAll,
    56  			},
    57  			Time: &types.EventFilterSpecByTime{
    58  				BeginTime: types.NewTime(now.Add(*begin * -1)),
    59  			},
    60  		}
    61  		if *end != 0 {
    62  			filter.Time.EndTime = types.NewTime(now.Add(*end * -1))
    63  		}
    64  
    65  		collector, err := m.CreateCollectorForEvents(ctx, filter)
    66  		if err != nil {
    67  			return err
    68  		}
    69  
    70  		defer collector.Destroy(ctx)
    71  
    72  		for {
    73  			events, err := collector.ReadNextEvents(ctx, 100)
    74  			if err != nil {
    75  				return err
    76  			}
    77  
    78  			if len(events) == 0 {
    79  				if *follow {
    80  					time.Sleep(time.Second)
    81  					continue
    82  				}
    83  				break
    84  			}
    85  
    86  			for i := range events {
    87  				event := events[i].GetEvent()
    88  				kind := reflect.TypeOf(events[i]).Elem().Name()
    89  				fmt.Printf("%d [%s] [%s] %s\n", event.Key, event.CreatedTime.Format(time.ANSIC), kind, event.FullFormattedMessage)
    90  			}
    91  		}
    92  
    93  		return nil
    94  	})
    95  }