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output.go
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output.go
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/*
Copyright (c) 2014-2016 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 flags
import (
"context"
"encoding/json"
"errors"
"flag"
"fmt"
"io"
"os"
"reflect"
"strings"
"sync"
"time"
"github.com/dougm/pretty"
"github.com/vmware/govmomi/task"
"github.com/vmware/govmomi/vim25/progress"
"github.com/vmware/govmomi/vim25/soap"
"github.com/vmware/govmomi/vim25/types"
"github.com/vmware/govmomi/vim25/xml"
)
type OutputWriter interface {
Write(io.Writer) error
}
type OutputFlag struct {
common
JSON bool
XML bool
TTY bool
Dump bool
Out io.Writer
formatError bool
formatIndent bool
}
var outputFlagKey = flagKey("output")
func NewOutputFlag(ctx context.Context) (*OutputFlag, context.Context) {
if v := ctx.Value(outputFlagKey); v != nil {
return v.(*OutputFlag), ctx
}
v := &OutputFlag{Out: os.Stdout}
ctx = context.WithValue(ctx, outputFlagKey, v)
return v, ctx
}
func (flag *OutputFlag) Register(ctx context.Context, f *flag.FlagSet) {
flag.RegisterOnce(func() {
f.BoolVar(&flag.JSON, "json", false, "Enable JSON output")
f.BoolVar(&flag.XML, "xml", false, "Enable XML output")
f.BoolVar(&flag.Dump, "dump", false, "Enable Go output")
// Avoid adding more flags for now..
flag.formatIndent = os.Getenv("GOVC_INDENT") != "false" // Default to indented output
flag.formatError = os.Getenv("GOVC_FORMAT_ERROR") != "false" // Default to formatted errors
})
}
func (flag *OutputFlag) Process(ctx context.Context) error {
return flag.ProcessOnce(func() error {
if !flag.All() {
// Assume we have a tty if not outputting JSON
flag.TTY = true
}
return nil
})
}
// Log outputs the specified string, prefixed with the current time.
// A newline is not automatically added. If the specified string
// starts with a '\r', the current line is cleared first.
func (flag *OutputFlag) Log(s string) (int, error) {
if len(s) > 0 && s[0] == '\r' {
flag.Write([]byte{'\r', 033, '[', 'K'})
s = s[1:]
}
return flag.WriteString(time.Now().Format("[02-01-06 15:04:05] ") + s)
}
func (flag *OutputFlag) Write(b []byte) (int, error) {
if !flag.TTY {
return 0, nil
}
w := flag.Out
if w == nil {
w = os.Stdout
}
n, err := w.Write(b)
if w == os.Stdout {
os.Stdout.Sync()
}
return n, err
}
func (flag *OutputFlag) WriteString(s string) (int, error) {
return flag.Write([]byte(s))
}
func (flag *OutputFlag) All() bool {
return flag.JSON || flag.XML || flag.Dump
}
func dumpValue(val interface{}) interface{} {
type dumper interface {
Dump() interface{}
}
if d, ok := val.(dumper); ok {
return d.Dump()
}
rval := reflect.ValueOf(val)
if rval.Type().Kind() != reflect.Ptr {
return val
}
rval = rval.Elem()
if rval.Type().Kind() == reflect.Struct {
f := rval.Field(0)
if f.Type().Kind() == reflect.Slice {
// common case for the various 'type infoResult'
if f.Len() == 1 {
return f.Index(0).Interface()
}
return f.Interface()
}
if rval.NumField() == 1 && rval.Type().Field(0).Anonymous {
// common case where govc type wraps govmomi type to implement OutputWriter
return f.Interface()
}
}
return val
}
func (flag *OutputFlag) WriteResult(result OutputWriter) error {
var err error
switch {
case flag.Dump:
format := "%#v\n"
if flag.formatIndent {
format = "%# v\n"
}
_, err = pretty.Fprintf(flag.Out, format, dumpValue(result))
case flag.JSON:
e := json.NewEncoder(flag.Out)
if flag.formatIndent {
e.SetIndent("", " ")
}
err = e.Encode(result)
case flag.XML:
e := xml.NewEncoder(flag.Out)
if flag.formatIndent {
e.Indent("", " ")
}
err = e.Encode(dumpValue(result))
if err == nil {
fmt.Fprintln(flag.Out)
}
default:
err = result.Write(flag.Out)
}
return err
}
func (flag *OutputFlag) WriteError(err error) bool {
if flag.formatError {
flag.Out = os.Stderr
return flag.WriteResult(&errorOutput{err}) == nil
}
return false
}
type errorOutput struct {
error
}
func (e errorOutput) Write(w io.Writer) error {
reason := e.error.Error()
var messages []string
var faults []types.LocalizableMessage
switch err := e.error.(type) {
case task.Error:
faults = err.LocalizedMethodFault.Fault.GetMethodFault().FaultMessage
if err.Description != nil {
reason = fmt.Sprintf("%s (%s)", reason, err.Description.Message)
}
default:
if soap.IsSoapFault(err) {
detail := soap.ToSoapFault(err).Detail.Fault
if f, ok := detail.(types.BaseMethodFault); ok {
faults = f.GetMethodFault().FaultMessage
}
}
}
for _, m := range faults {
if m.Message != "" && !strings.HasPrefix(m.Message, "[context]") {
messages = append(messages, fmt.Sprintf("%s (%s)", m.Message, m.Key))
}
}
messages = append(messages, reason)
for _, message := range messages {
if _, err := fmt.Fprintf(w, "%s: %s\n", os.Args[0], message); err != nil {
return err
}
}
return nil
}
func (e errorOutput) Dump() interface{} {
if f, ok := e.error.(task.Error); ok {
return f.LocalizedMethodFault
}
if soap.IsSoapFault(e.error) {
return soap.ToSoapFault(e.error)
}
if soap.IsVimFault(e.error) {
return soap.ToVimFault(e.error)
}
return e
}
func (e errorOutput) canEncode() bool {
switch e.error.(type) {
case task.Error:
return true
}
return soap.IsSoapFault(e.error) || soap.IsVimFault(e.error)
}
// cannotEncode causes cli.Run to output err.Error() as it would without an error format specified
var cannotEncode = errors.New("cannot encode error")
func (e errorOutput) MarshalJSON() ([]byte, error) {
_, ok := e.error.(json.Marshaler)
if ok || e.canEncode() {
return json.Marshal(e.error)
}
return nil, cannotEncode
}
func (e errorOutput) MarshalXML(encoder *xml.Encoder, start xml.StartElement) error {
_, ok := e.error.(xml.Marshaler)
if ok || e.canEncode() {
return encoder.Encode(e.error)
}
return cannotEncode
}
type progressLogger struct {
flag *OutputFlag
prefix string
wg sync.WaitGroup
sink chan chan progress.Report
done chan struct{}
}
func newProgressLogger(flag *OutputFlag, prefix string) *progressLogger {
p := &progressLogger{
flag: flag,
prefix: prefix,
sink: make(chan chan progress.Report),
done: make(chan struct{}),
}
p.wg.Add(1)
go p.loopA()
return p
}
// loopA runs before Sink() has been called.
func (p *progressLogger) loopA() {
var err error
defer p.wg.Done()
tick := time.NewTicker(100 * time.Millisecond)
defer tick.Stop()
called := false
for stop := false; !stop; {
select {
case ch := <-p.sink:
err = p.loopB(tick, ch)
stop = true
called = true
case <-p.done:
stop = true
case <-tick.C:
line := fmt.Sprintf("\r%s", p.prefix)
p.flag.Log(line)
}
}
if err != nil && err != io.EOF {
p.flag.Log(fmt.Sprintf("\r%sError: %s\n", p.prefix, err))
} else if called {
p.flag.Log(fmt.Sprintf("\r%sOK\n", p.prefix))
}
}
// loopA runs after Sink() has been called.
func (p *progressLogger) loopB(tick *time.Ticker, ch <-chan progress.Report) error {
var r progress.Report
var ok bool
var err error
for ok = true; ok; {
select {
case r, ok = <-ch:
if !ok {
break
}
err = r.Error()
case <-tick.C:
line := fmt.Sprintf("\r%s", p.prefix)
if r != nil {
line += fmt.Sprintf("(%.0f%%", r.Percentage())
detail := r.Detail()
if detail != "" {
line += fmt.Sprintf(", %s", detail)
}
line += ")"
}
p.flag.Log(line)
}
}
return err
}
func (p *progressLogger) Sink() chan<- progress.Report {
ch := make(chan progress.Report)
p.sink <- ch
return ch
}
func (p *progressLogger) Wait() {
close(p.done)
p.wg.Wait()
}
func (flag *OutputFlag) ProgressLogger(prefix string) *progressLogger {
return newProgressLogger(flag, prefix)
}