forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
humanreadable.go
852 lines (765 loc) · 26.4 KB
/
humanreadable.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
/*
Copyright 2017 The Kubernetes Authors.
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 printers
import (
"bytes"
"fmt"
"io"
"reflect"
"strings"
"text/tabwriter"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
metav1beta1 "k8s.io/apimachinery/pkg/apis/meta/v1beta1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
)
type TablePrinter interface {
PrintTable(obj runtime.Object, options PrintOptions) (*metav1beta1.Table, error)
}
type PrintHandler interface {
Handler(columns, columnsWithWide []string, printFunc interface{}) error
TableHandler(columns []metav1beta1.TableColumnDefinition, printFunc interface{}) error
DefaultTableHandler(columns []metav1beta1.TableColumnDefinition, printFunc interface{}) error
}
var withNamespacePrefixColumns = []string{"NAMESPACE"} // TODO(erictune): print cluster name too.
type handlerEntry struct {
columnDefinitions []metav1beta1.TableColumnDefinition
printRows bool
printFunc reflect.Value
args []reflect.Value
}
// HumanReadablePrinter is an implementation of ResourcePrinter which attempts to provide
// more elegant output. It is not threadsafe, but you may call PrintObj repeatedly; headers
// will only be printed if the object type changes. This makes it useful for printing items
// received from watches.
type HumanReadablePrinter struct {
handlerMap map[reflect.Type]*handlerEntry
defaultHandler *handlerEntry
options PrintOptions
lastType interface{}
skipTabWriter bool
encoder runtime.Encoder
decoder runtime.Decoder
}
var _ PrintHandler = &HumanReadablePrinter{}
// NewHumanReadablePrinter creates a HumanReadablePrinter.
// If encoder and decoder are provided, an attempt to convert unstructured types to internal types is made.
func NewHumanReadablePrinter(encoder runtime.Encoder, decoder runtime.Decoder, options PrintOptions) *HumanReadablePrinter {
printer := &HumanReadablePrinter{
handlerMap: make(map[reflect.Type]*handlerEntry),
options: options,
encoder: encoder,
decoder: decoder,
}
return printer
}
// NewTablePrinter creates a HumanReadablePrinter suitable for calling PrintTable().
func NewTablePrinter() *HumanReadablePrinter {
return &HumanReadablePrinter{
handlerMap: make(map[reflect.Type]*handlerEntry),
}
}
// AddTabWriter sets whether the PrintObj function will format with tabwriter (true
// by default).
func (a *HumanReadablePrinter) AddTabWriter(t bool) *HumanReadablePrinter {
a.skipTabWriter = !t
return a
}
func (a *HumanReadablePrinter) With(fns ...func(PrintHandler)) *HumanReadablePrinter {
for _, fn := range fns {
fn(a)
}
return a
}
// EnsurePrintHeaders sets the HumanReadablePrinter option "NoHeaders" to false
// and removes the .lastType that was printed, which forces headers to be
// printed in cases where multiple lists of the same resource are printed
// consecutively, but are separated by non-printer related information.
func (h *HumanReadablePrinter) EnsurePrintHeaders() {
h.options.NoHeaders = false
h.lastType = nil
}
// Handler adds a print handler with a given set of columns to HumanReadablePrinter instance.
// See ValidatePrintHandlerFunc for required method signature.
func (h *HumanReadablePrinter) Handler(columns, columnsWithWide []string, printFunc interface{}) error {
var columnDefinitions []metav1beta1.TableColumnDefinition
for _, column := range columns {
columnDefinitions = append(columnDefinitions, metav1beta1.TableColumnDefinition{
Name: column,
Type: "string",
})
}
for _, column := range columnsWithWide {
columnDefinitions = append(columnDefinitions, metav1beta1.TableColumnDefinition{
Name: column,
Type: "string",
Priority: 1,
})
}
printFuncValue := reflect.ValueOf(printFunc)
if err := ValidatePrintHandlerFunc(printFuncValue); err != nil {
utilruntime.HandleError(fmt.Errorf("unable to register print function: %v", err))
return err
}
entry := &handlerEntry{
columnDefinitions: columnDefinitions,
printFunc: printFuncValue,
}
objType := printFuncValue.Type().In(0)
if _, ok := h.handlerMap[objType]; ok {
err := fmt.Errorf("registered duplicate printer for %v", objType)
utilruntime.HandleError(err)
return err
}
h.handlerMap[objType] = entry
return nil
}
// TableHandler adds a print handler with a given set of columns to HumanReadablePrinter instance.
// See ValidateRowPrintHandlerFunc for required method signature.
func (h *HumanReadablePrinter) TableHandler(columnDefinitions []metav1beta1.TableColumnDefinition, printFunc interface{}) error {
printFuncValue := reflect.ValueOf(printFunc)
if err := ValidateRowPrintHandlerFunc(printFuncValue); err != nil {
utilruntime.HandleError(fmt.Errorf("unable to register print function: %v", err))
return err
}
entry := &handlerEntry{
columnDefinitions: columnDefinitions,
printRows: true,
printFunc: printFuncValue,
}
objType := printFuncValue.Type().In(0)
if _, ok := h.handlerMap[objType]; ok {
err := fmt.Errorf("registered duplicate printer for %v", objType)
utilruntime.HandleError(err)
return err
}
h.handlerMap[objType] = entry
return nil
}
// DefaultTableHandler registers a set of columns and a print func that is given a chance to process
// any object without an explicit handler. Only the most recently set print handler is used.
// See ValidateRowPrintHandlerFunc for required method signature.
func (h *HumanReadablePrinter) DefaultTableHandler(columnDefinitions []metav1beta1.TableColumnDefinition, printFunc interface{}) error {
printFuncValue := reflect.ValueOf(printFunc)
if err := ValidateRowPrintHandlerFunc(printFuncValue); err != nil {
utilruntime.HandleError(fmt.Errorf("unable to register print function: %v", err))
return err
}
entry := &handlerEntry{
columnDefinitions: columnDefinitions,
printRows: true,
printFunc: printFuncValue,
}
h.defaultHandler = entry
return nil
}
// ValidateRowPrintHandlerFunc validates print handler signature.
// printFunc is the function that will be called to print an object.
// It must be of the following type:
// func printFunc(object ObjectType, options PrintOptions) ([]metav1beta1.TableRow, error)
// where ObjectType is the type of the object that will be printed, and the first
// return value is an array of rows, with each row containing a number of cells that
// match the number of columns defined for that printer function.
func ValidateRowPrintHandlerFunc(printFunc reflect.Value) error {
if printFunc.Kind() != reflect.Func {
return fmt.Errorf("invalid print handler. %#v is not a function", printFunc)
}
funcType := printFunc.Type()
if funcType.NumIn() != 2 || funcType.NumOut() != 2 {
return fmt.Errorf("invalid print handler." +
"Must accept 2 parameters and return 2 value.")
}
if funcType.In(1) != reflect.TypeOf((*PrintOptions)(nil)).Elem() ||
funcType.Out(0) != reflect.TypeOf((*[]metav1beta1.TableRow)(nil)).Elem() ||
funcType.Out(1) != reflect.TypeOf((*error)(nil)).Elem() {
return fmt.Errorf("invalid print handler. The expected signature is: "+
"func handler(obj %v, options PrintOptions) ([]metav1beta1.TableRow, error)", funcType.In(0))
}
return nil
}
// ValidatePrintHandlerFunc validates print handler signature.
// printFunc is the function that will be called to print an object.
// It must be of the following type:
// func printFunc(object ObjectType, w io.Writer, options PrintOptions) error
// where ObjectType is the type of the object that will be printed.
// DEPRECATED: will be replaced with ValidateRowPrintHandlerFunc
func ValidatePrintHandlerFunc(printFunc reflect.Value) error {
if printFunc.Kind() != reflect.Func {
return fmt.Errorf("invalid print handler. %#v is not a function", printFunc)
}
funcType := printFunc.Type()
if funcType.NumIn() != 3 || funcType.NumOut() != 1 {
return fmt.Errorf("invalid print handler." +
"Must accept 3 parameters and return 1 value.")
}
if funcType.In(1) != reflect.TypeOf((*io.Writer)(nil)).Elem() ||
funcType.In(2) != reflect.TypeOf((*PrintOptions)(nil)).Elem() ||
funcType.Out(0) != reflect.TypeOf((*error)(nil)).Elem() {
return fmt.Errorf("invalid print handler. The expected signature is: "+
"func handler(obj %v, w io.Writer, options PrintOptions) error", funcType.In(0))
}
return nil
}
func (h *HumanReadablePrinter) HandledResources() []string {
keys := make([]string, 0)
for k := range h.handlerMap {
// k.String looks like "*api.PodList" and we want just "pod"
api := strings.Split(k.String(), ".")
resource := api[len(api)-1]
if strings.HasSuffix(resource, "List") {
continue
}
resource = strings.ToLower(resource)
keys = append(keys, resource)
}
return keys
}
func (h *HumanReadablePrinter) AfterPrint(output io.Writer, res string) error {
return nil
}
func (h *HumanReadablePrinter) IsGeneric() bool {
return false
}
func (h *HumanReadablePrinter) unknown(data []byte, w io.Writer) error {
_, err := fmt.Fprintf(w, "Unknown object: %s", string(data))
return err
}
func printHeader(columnNames []string, w io.Writer) error {
if _, err := fmt.Fprintf(w, "%s\n", strings.Join(columnNames, "\t")); err != nil {
return err
}
return nil
}
// PrintObj prints the obj in a human-friendly format according to the type of the obj.
// TODO: unify the behavior of PrintObj, which often expects single items and tracks
// headers and filtering, with other printers, that expect list objects. The tracking
// behavior should probably be a higher level wrapper (MultiObjectTablePrinter) that
// calls into the PrintTable method and then displays consistent output.
func (h *HumanReadablePrinter) PrintObj(obj runtime.Object, output io.Writer) error {
if w, found := output.(*tabwriter.Writer); !found && !h.skipTabWriter {
w = GetNewTabWriter(output)
output = w
defer w.Flush()
}
// display tables following the rules of options
if table, ok := obj.(*metav1beta1.Table); ok {
if err := DecorateTable(table, h.options); err != nil {
return err
}
return PrintTable(table, output, h.options)
}
// check if the object is unstructured. If so, let's attempt to convert it to a type we can understand before
// trying to print, since the printers are keyed by type. This is extremely expensive.
if h.encoder != nil && h.decoder != nil {
obj, _ = decodeUnknownObject(obj, h.encoder, h.decoder)
}
// print with a registered handler
t := reflect.TypeOf(obj)
if handler := h.handlerMap[t]; handler != nil {
includeHeaders := h.lastType != t && !h.options.NoHeaders
if err := printRowsForHandlerEntry(output, handler, obj, h.options, includeHeaders); err != nil {
return err
}
h.lastType = t
return nil
}
// print with the default handler if set, and use the columns from the last time
if h.defaultHandler != nil {
includeHeaders := h.lastType != h.defaultHandler && !h.options.NoHeaders
if err := printRowsForHandlerEntry(output, h.defaultHandler, obj, h.options, includeHeaders); err != nil {
return err
}
h.lastType = h.defaultHandler
return nil
}
// we failed all reasonable printing efforts, report failure
return fmt.Errorf("error: unknown type %#v", obj)
}
func hasCondition(conditions []metav1beta1.TableRowCondition, t metav1beta1.RowConditionType) bool {
for _, condition := range conditions {
if condition.Type == t {
return condition.Status == metav1beta1.ConditionTrue
}
}
return false
}
// PrintTable prints a table to the provided output respecting the filtering rules for options
// for wide columns and filtered rows. It filters out rows that are Completed. You should call
// DecorateTable if you receive a table from a remote server before calling PrintTable.
func PrintTable(table *metav1beta1.Table, output io.Writer, options PrintOptions) error {
if !options.NoHeaders {
// avoid printing headers if we have no rows to display
if len(table.Rows) == 0 {
return nil
}
first := true
for _, column := range table.ColumnDefinitions {
if !options.Wide && column.Priority != 0 {
continue
}
if first {
first = false
} else {
fmt.Fprint(output, "\t")
}
fmt.Fprint(output, strings.ToUpper(column.Name))
}
fmt.Fprintln(output)
}
for _, row := range table.Rows {
if !options.ShowAll && hasCondition(row.Conditions, metav1beta1.RowCompleted) {
continue
}
first := true
for i, cell := range row.Cells {
column := table.ColumnDefinitions[i]
if !options.Wide && column.Priority != 0 {
continue
}
if first {
first = false
} else {
fmt.Fprint(output, "\t")
}
if cell != nil {
fmt.Fprint(output, cell)
}
}
fmt.Fprintln(output)
}
return nil
}
// DecorateTable takes a table and attempts to add label columns and the
// namespace column. It will fill empty columns with nil (if the object
// does not expose metadata). It returns an error if the table cannot
// be decorated.
func DecorateTable(table *metav1beta1.Table, options PrintOptions) error {
width := len(table.ColumnDefinitions) + len(options.ColumnLabels)
if options.WithNamespace {
width++
}
if options.ShowLabels {
width++
}
columns := table.ColumnDefinitions
nameColumn := -1
if options.WithKind && !options.Kind.Empty() {
for i := range columns {
if columns[i].Format == "name" && columns[i].Type == "string" {
nameColumn = i
break
}
}
}
if width != len(table.ColumnDefinitions) {
columns = make([]metav1beta1.TableColumnDefinition, 0, width)
if options.WithNamespace {
columns = append(columns, metav1beta1.TableColumnDefinition{
Name: "Namespace",
Type: "string",
})
}
columns = append(columns, table.ColumnDefinitions...)
for _, label := range formatLabelHeaders(options.ColumnLabels) {
columns = append(columns, metav1beta1.TableColumnDefinition{
Name: label,
Type: "string",
})
}
if options.ShowLabels {
columns = append(columns, metav1beta1.TableColumnDefinition{
Name: "Labels",
Type: "string",
})
}
}
rows := table.Rows
includeLabels := len(options.ColumnLabels) > 0 || options.ShowLabels
if includeLabels || options.WithNamespace || nameColumn != -1 {
for i := range rows {
row := rows[i]
if nameColumn != -1 {
row.Cells[nameColumn] = fmt.Sprintf("%s/%s", strings.ToLower(options.Kind.String()), row.Cells[nameColumn])
}
var m metav1.Object
if obj := row.Object.Object; obj != nil {
if acc, err := meta.Accessor(obj); err == nil {
m = acc
}
}
// if we can't get an accessor, fill out the appropriate columns with empty spaces
if m == nil {
if options.WithNamespace {
r := make([]interface{}, 1, width)
row.Cells = append(r, row.Cells...)
}
for j := 0; j < width-len(row.Cells); j++ {
row.Cells = append(row.Cells, nil)
}
rows[i] = row
continue
}
if options.WithNamespace {
r := make([]interface{}, 1, width)
r[0] = m.GetNamespace()
row.Cells = append(r, row.Cells...)
}
if includeLabels {
row.Cells = appendLabelCells(row.Cells, m.GetLabels(), options)
}
rows[i] = row
}
}
table.ColumnDefinitions = columns
table.Rows = rows
return nil
}
// PrintTable returns a table for the provided object, using the printer registered for that type. It returns
// a table that includes all of the information requested by options, but will not remove rows or columns. The
// caller is responsible for applying rules related to filtering rows or columns.
func (h *HumanReadablePrinter) PrintTable(obj runtime.Object, options PrintOptions) (*metav1beta1.Table, error) {
t := reflect.TypeOf(obj)
handler, ok := h.handlerMap[t]
if !ok {
return nil, fmt.Errorf("no table handler registered for this type %v", t)
}
if !handler.printRows {
return h.legacyPrinterToTable(obj, handler)
}
args := []reflect.Value{reflect.ValueOf(obj), reflect.ValueOf(options)}
results := handler.printFunc.Call(args)
if !results[1].IsNil() {
return nil, results[1].Interface().(error)
}
columns := handler.columnDefinitions
if !options.Wide {
columns = make([]metav1beta1.TableColumnDefinition, 0, len(handler.columnDefinitions))
for i := range handler.columnDefinitions {
if handler.columnDefinitions[i].Priority != 0 {
continue
}
columns = append(columns, handler.columnDefinitions[i])
}
}
table := &metav1beta1.Table{
ListMeta: metav1.ListMeta{
ResourceVersion: "",
},
ColumnDefinitions: columns,
Rows: results[0].Interface().([]metav1beta1.TableRow),
}
if m, err := meta.ListAccessor(obj); err == nil {
table.ResourceVersion = m.GetResourceVersion()
table.SelfLink = m.GetSelfLink()
table.Continue = m.GetContinue()
} else {
if m, err := meta.CommonAccessor(obj); err == nil {
table.ResourceVersion = m.GetResourceVersion()
table.SelfLink = m.GetSelfLink()
}
}
if err := DecorateTable(table, options); err != nil {
return nil, err
}
return table, nil
}
// printRowsForHandlerEntry prints the incremental table output (headers if the current type is
// different from lastType) including all the rows in the object. It returns the current type
// or an error, if any.
func printRowsForHandlerEntry(output io.Writer, handler *handlerEntry, obj runtime.Object, options PrintOptions, includeHeaders bool) error {
var results []reflect.Value
if handler.printRows {
args := []reflect.Value{reflect.ValueOf(obj), reflect.ValueOf(options)}
results = handler.printFunc.Call(args)
if !results[1].IsNil() {
return results[1].Interface().(error)
}
}
if includeHeaders {
var headers []string
for _, column := range handler.columnDefinitions {
if column.Priority != 0 && !options.Wide {
continue
}
headers = append(headers, strings.ToUpper(column.Name))
}
headers = append(headers, formatLabelHeaders(options.ColumnLabels)...)
// LABELS is always the last column.
headers = append(headers, formatShowLabelsHeader(options.ShowLabels)...)
if options.WithNamespace {
headers = append(withNamespacePrefixColumns, headers...)
}
printHeader(headers, output)
}
if !handler.printRows {
// TODO: this code path is deprecated and will be removed when all handlers are row printers
args := []reflect.Value{reflect.ValueOf(obj), reflect.ValueOf(output), reflect.ValueOf(options)}
resultValue := handler.printFunc.Call(args)[0]
if resultValue.IsNil() {
return nil
}
return resultValue.Interface().(error)
}
if results[1].IsNil() {
rows := results[0].Interface().([]metav1beta1.TableRow)
printRows(output, rows, options)
return nil
}
return results[1].Interface().(error)
}
// printRows writes the provided rows to output.
func printRows(output io.Writer, rows []metav1beta1.TableRow, options PrintOptions) {
for _, row := range rows {
if options.WithNamespace {
if obj := row.Object.Object; obj != nil {
if m, err := meta.Accessor(obj); err == nil {
fmt.Fprint(output, m.GetNamespace())
}
}
fmt.Fprint(output, "\t")
}
for i, cell := range row.Cells {
if i != 0 {
fmt.Fprint(output, "\t")
} else {
// TODO: remove this once we drop the legacy printers
if options.WithKind && !options.Kind.Empty() {
fmt.Fprintf(output, "%s/%s", strings.ToLower(options.Kind.String()), cell)
continue
}
}
fmt.Fprint(output, cell)
}
hasLabels := len(options.ColumnLabels) > 0
if obj := row.Object.Object; obj != nil && (hasLabels || options.ShowLabels) {
if m, err := meta.Accessor(obj); err == nil {
for _, value := range labelValues(m.GetLabels(), options) {
output.Write([]byte("\t"))
output.Write([]byte(value))
}
}
}
output.Write([]byte("\n"))
}
}
// legacyPrinterToTable uses the old printFunc with tabbed writer to generate a table.
// TODO: remove when all legacy printers are removed.
func (h *HumanReadablePrinter) legacyPrinterToTable(obj runtime.Object, handler *handlerEntry) (*metav1beta1.Table, error) {
printFunc := handler.printFunc
table := &metav1beta1.Table{
ColumnDefinitions: handler.columnDefinitions,
}
options := PrintOptions{
NoHeaders: true,
Wide: true,
}
buf := &bytes.Buffer{}
args := []reflect.Value{reflect.ValueOf(obj), reflect.ValueOf(buf), reflect.ValueOf(options)}
if meta.IsListType(obj) {
// TODO: this uses more memory than it has to, as we refactor printers we should remove the need
// for this.
args[0] = reflect.ValueOf(obj)
resultValue := printFunc.Call(args)[0]
if !resultValue.IsNil() {
return nil, resultValue.Interface().(error)
}
data := buf.Bytes()
i := 0
items, err := meta.ExtractList(obj)
if err != nil {
return nil, err
}
for len(data) > 0 {
cells, remainder := tabbedLineToCells(data, len(table.ColumnDefinitions))
table.Rows = append(table.Rows, metav1beta1.TableRow{
Cells: cells,
Object: runtime.RawExtension{Object: items[i]},
})
data = remainder
i++
}
} else {
args[0] = reflect.ValueOf(obj)
resultValue := printFunc.Call(args)[0]
if !resultValue.IsNil() {
return nil, resultValue.Interface().(error)
}
data := buf.Bytes()
cells, _ := tabbedLineToCells(data, len(table.ColumnDefinitions))
table.Rows = append(table.Rows, metav1beta1.TableRow{
Cells: cells,
Object: runtime.RawExtension{Object: obj},
})
}
return table, nil
}
// TODO: this method assumes the meta/v1 server API, so should be refactored out of this package
func printUnstructured(unstructured runtime.Unstructured, w io.Writer, additionalFields []string, options PrintOptions) error {
metadata, err := meta.Accessor(unstructured)
if err != nil {
return err
}
if options.WithNamespace {
if _, err := fmt.Fprintf(w, "%s\t", metadata.GetNamespace()); err != nil {
return err
}
}
content := unstructured.UnstructuredContent()
kind := "<missing>"
if objKind, ok := content["kind"]; ok {
if str, ok := objKind.(string); ok {
kind = str
}
}
if objAPIVersion, ok := content["apiVersion"]; ok {
if str, ok := objAPIVersion.(string); ok {
version, err := schema.ParseGroupVersion(str)
if err != nil {
return err
}
kind = kind + "." + version.Version + "." + version.Group
}
}
name := FormatResourceName(options.Kind, metadata.GetName(), options.WithKind)
if _, err := fmt.Fprintf(w, "%s\t%s", name, kind); err != nil {
return err
}
for _, field := range additionalFields {
if value, ok := content[field]; ok {
var formattedValue string
switch typedValue := value.(type) {
case []interface{}:
formattedValue = fmt.Sprintf("%d item(s)", len(typedValue))
default:
formattedValue = fmt.Sprintf("%v", value)
}
if _, err := fmt.Fprintf(w, "\t%s", formattedValue); err != nil {
return err
}
}
}
if _, err := fmt.Fprint(w, AppendLabels(metadata.GetLabels(), options.ColumnLabels)); err != nil {
return err
}
if _, err := fmt.Fprint(w, AppendAllLabels(options.ShowLabels, metadata.GetLabels())); err != nil {
return err
}
return nil
}
func formatLabelHeaders(columnLabels []string) []string {
formHead := make([]string, len(columnLabels))
for i, l := range columnLabels {
p := strings.Split(l, "/")
formHead[i] = strings.ToUpper((p[len(p)-1]))
}
return formHead
}
// headers for --show-labels=true
func formatShowLabelsHeader(showLabels bool) []string {
if showLabels {
return []string{"LABELS"}
}
return nil
}
// labelValues returns a slice of value columns matching the requested print options.
func labelValues(itemLabels map[string]string, opts PrintOptions) []string {
var values []string
for _, key := range opts.ColumnLabels {
values = append(values, itemLabels[key])
}
if opts.ShowLabels {
values = append(values, labels.FormatLabels(itemLabels))
}
return values
}
// appendLabelCells returns a slice of value columns matching the requested print options.
// Intended for use with tables.
func appendLabelCells(values []interface{}, itemLabels map[string]string, opts PrintOptions) []interface{} {
for _, key := range opts.ColumnLabels {
values = append(values, itemLabels[key])
}
if opts.ShowLabels {
values = append(values, labels.FormatLabels(itemLabels))
}
return values
}
// FormatResourceName receives a resource kind, name, and boolean specifying
// whether or not to update the current name to "kind/name"
func FormatResourceName(kind schema.GroupKind, name string, withKind bool) string {
if !withKind || kind.Empty() {
return name
}
return strings.ToLower(kind.String()) + "/" + name
}
func AppendLabels(itemLabels map[string]string, columnLabels []string) string {
var buffer bytes.Buffer
for _, cl := range columnLabels {
buffer.WriteString(fmt.Sprint("\t"))
if il, ok := itemLabels[cl]; ok {
buffer.WriteString(fmt.Sprint(il))
} else {
buffer.WriteString("<none>")
}
}
return buffer.String()
}
// Append all labels to a single column. We need this even when show-labels flag* is
// false, since this adds newline delimiter to the end of each row.
func AppendAllLabels(showLabels bool, itemLabels map[string]string) string {
var buffer bytes.Buffer
if showLabels {
buffer.WriteString(fmt.Sprint("\t"))
buffer.WriteString(labels.FormatLabels(itemLabels))
}
buffer.WriteString("\n")
return buffer.String()
}
// check if the object is unstructured. If so, attempt to convert it to a type we can understand.
func decodeUnknownObject(obj runtime.Object, encoder runtime.Encoder, decoder runtime.Decoder) (runtime.Object, error) {
var err error
switch obj.(type) {
case runtime.Unstructured, *runtime.Unknown:
if objBytes, err := runtime.Encode(encoder, obj); err == nil {
if decodedObj, err := runtime.Decode(decoder, objBytes); err == nil {
obj = decodedObj
}
}
}
return obj, err
}
func tabbedLineToCells(data []byte, expected int) ([]interface{}, []byte) {
var remainder []byte
max := bytes.Index(data, []byte("\n"))
if max != -1 {
remainder = data[max+1:]
data = data[:max]
}
cells := make([]interface{}, expected)
for i := 0; i < expected; i++ {
next := bytes.Index(data, []byte("\t"))
if next == -1 {
cells[i] = string(data)
// fill the remainder with empty strings, this indicates a printer bug
for j := i + 1; j < expected; j++ {
cells[j] = ""
}
break
}
cells[i] = string(data[:next])
data = data[next+1:]
}
return cells, remainder
}