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vsphere-influxdb-go/vendor/github.com/vmware/govmomi/govc/object/collect.go

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2017-10-25 22:52:40 +02:00
/*
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 object
import (
"context"
"encoding/json"
"flag"
"fmt"
"io"
"reflect"
"strings"
"text/tabwriter"
"github.com/vmware/govmomi/govc/cli"
"github.com/vmware/govmomi/govc/flags"
"github.com/vmware/govmomi/property"
"github.com/vmware/govmomi/vim25/methods"
"github.com/vmware/govmomi/vim25/types"
)
type collect struct {
*flags.DatacenterFlag
single bool
simple bool
n int
}
func init() {
cli.Register("object.collect", &collect{})
}
func (cmd *collect) Register(ctx context.Context, f *flag.FlagSet) {
cmd.DatacenterFlag, ctx = flags.NewDatacenterFlag(ctx)
cmd.DatacenterFlag.Register(ctx, f)
f.BoolVar(&cmd.simple, "s", false, "Output property value only")
f.IntVar(&cmd.n, "n", 0, "Wait for N property updates")
}
func (cmd *collect) Usage() string {
return "[MOID] [PROPERTY]..."
}
func (cmd *collect) Description() string {
return `Collect managed object properties.
MOID can be an inventory path or ManagedObjectReference.
MOID defaults to '-', an alias for 'ServiceInstance:ServiceInstance'.
By default only the current property value(s) are collected. Use the '-n' flag to wait for updates.
Examples:
govc object.collect - content
govc object.collect -s HostSystem:ha-host hardware.systemInfo.uuid
govc object.collect -s /ha-datacenter/vm/foo overallStatus
govc object.collect -json -n=-1 EventManager:ha-eventmgr latestEvent | jq .
govc object.collect -json -s $(govc object.collect -s - content.perfManager) description.counterType | jq .`
}
func (cmd *collect) Process(ctx context.Context) error {
if err := cmd.DatacenterFlag.Process(ctx); err != nil {
return err
}
return nil
}
var stringer = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
type change struct {
cmd *collect
PropertyChange []types.PropertyChange
}
func (pc *change) MarshalJSON() ([]byte, error) {
return json.Marshal(pc.PropertyChange)
}
func (pc *change) output(name string, rval reflect.Value, rtype reflect.Type) {
s := "..."
kind := rval.Kind()
if kind == reflect.Ptr || kind == reflect.Interface {
if rval.IsNil() {
s = ""
} else {
rval = rval.Elem()
kind = rval.Kind()
}
}
switch kind {
case reflect.Ptr, reflect.Interface:
case reflect.Slice:
if rval.Len() == 0 {
s = ""
break
}
etype := rtype.Elem()
if etype.Kind() != reflect.Interface && etype.Kind() != reflect.Struct || etype.Implements(stringer) {
var val []string
for i := 0; i < rval.Len(); i++ {
v := rval.Index(i).Interface()
if fstr, ok := v.(fmt.Stringer); ok {
s = fstr.String()
} else {
s = fmt.Sprintf("%v", v)
}
val = append(val, s)
}
s = strings.Join(val, ",")
}
case reflect.Struct:
if rtype.Implements(stringer) {
s = rval.Interface().(fmt.Stringer).String()
}
default:
s = fmt.Sprintf("%v", rval.Interface())
}
if pc.cmd.simple {
fmt.Fprintln(pc.cmd.Out, s)
return
}
fmt.Fprintf(pc.cmd.Out, "%s\t%s\t%s\n", name, rtype, s)
}
func (pc *change) writeStruct(name string, rval reflect.Value, rtype reflect.Type) {
for i := 0; i < rval.NumField(); i++ {
fval := rval.Field(i)
field := rtype.Field(i)
if field.Anonymous {
pc.writeStruct(name, fval, fval.Type())
continue
}
fname := fmt.Sprintf("%s.%s%s", name, strings.ToLower(field.Name[:1]), field.Name[1:])
pc.output(fname, fval, field.Type)
}
}
func (pc *change) Write(w io.Writer) error {
tw := tabwriter.NewWriter(pc.cmd.Out, 4, 0, 2, ' ', 0)
pc.cmd.Out = tw
for _, c := range pc.PropertyChange {
if c.Val == nil {
// type is unknown in this case, as xsi:type was not provided - just skip for now
continue
}
rval := reflect.ValueOf(c.Val)
rtype := rval.Type()
if strings.HasPrefix(rtype.Name(), "ArrayOf") {
rval = rval.Field(0)
rtype = rval.Type()
}
if pc.cmd.single && rtype.Kind() == reflect.Struct && !rtype.Implements(stringer) {
pc.writeStruct(c.Name, rval, rtype)
continue
}
pc.output(c.Name, rval, rtype)
}
return tw.Flush()
}
func (cmd *collect) Run(ctx context.Context, f *flag.FlagSet) error {
client, err := cmd.Client()
if err != nil {
return err
}
finder, err := cmd.Finder()
if err != nil {
return err
}
ref := methods.ServiceInstance
arg := f.Arg(0)
switch arg {
case "", "-":
default:
if !ref.FromString(arg) {
l, ferr := finder.ManagedObjectList(ctx, arg)
if ferr != nil {
return err
}
switch len(l) {
case 0:
return fmt.Errorf("%s not found", arg)
case 1:
ref = l[0].Object.Reference()
default:
return flag.ErrHelp
}
}
}
p := property.DefaultCollector(client)
var props []string
if f.NArg() > 1 {
props = f.Args()[1:]
cmd.single = len(props) == 1
}
return property.Wait(ctx, p, ref, props, func(pc []types.PropertyChange) bool {
_ = cmd.WriteResult(&change{cmd, pc})
cmd.n--
return cmd.n == -1
})
}