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sorting_printer.go
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/
sorting_printer.go
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/*
Copyright 2014 The Kubernetes Authors 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 kubectl
import (
"fmt"
"io"
"reflect"
"sort"
"k8s.io/kubernetes/pkg/api/meta"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/api/v1"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/util/integer"
"k8s.io/kubernetes/pkg/util/jsonpath"
"github.com/golang/glog"
)
// Sorting printer sorts list types before delegating to another printer.
// Non-list types are simply passed through
type SortingPrinter struct {
SortField string
Delegate ResourcePrinter
Decoder runtime.Decoder
}
func (s *SortingPrinter) PrintObj(obj runtime.Object, out io.Writer) error {
if !meta.IsListType(obj) {
return s.Delegate.PrintObj(obj, out)
}
if err := s.sortObj(obj); err != nil {
return err
}
return s.Delegate.PrintObj(obj, out)
}
// TODO: implement HandledResources()
func (p *SortingPrinter) HandledResources() []string {
return []string{}
}
func (s *SortingPrinter) sortObj(obj runtime.Object) error {
objs, err := meta.ExtractList(obj)
if err != nil {
return err
}
if len(objs) == 0 {
return nil
}
sorter, err := SortObjects(s.Decoder, objs, s.SortField)
if err != nil {
return err
}
switch list := obj.(type) {
case *v1.List:
outputList := make([]runtime.RawExtension, len(objs))
for ix := range objs {
outputList[ix] = list.Items[sorter.OriginalPosition(ix)]
}
list.Items = outputList
return nil
}
return meta.SetList(obj, objs)
}
func SortObjects(decoder runtime.Decoder, objs []runtime.Object, fieldInput string) (*RuntimeSort, error) {
parser := jsonpath.New("sorting")
field, err := massageJSONPath(fieldInput)
if err != nil {
return nil, err
}
if err := parser.Parse(field); err != nil {
return nil, err
}
for ix := range objs {
item := objs[ix]
switch u := item.(type) {
case *runtime.Unknown:
var err error
if objs[ix], _, err = decoder.Decode(u.Raw, nil, nil); err != nil {
return nil, err
}
}
}
values, err := parser.FindResults(reflect.ValueOf(objs[0]).Elem().Interface())
if err != nil {
return nil, err
}
if len(values) == 0 {
return nil, fmt.Errorf("couldn't find any field with path: %s", field)
}
sorter := NewRuntimeSort(field, objs)
sort.Sort(sorter)
return sorter, nil
}
// RuntimeSort is an implementation of the golang sort interface that knows how to sort
// lists of runtime.Object
type RuntimeSort struct {
field string
objs []runtime.Object
origPosition []int
}
func NewRuntimeSort(field string, objs []runtime.Object) *RuntimeSort {
sorter := &RuntimeSort{field: field, objs: objs, origPosition: make([]int, len(objs))}
for ix := range objs {
sorter.origPosition[ix] = ix
}
return sorter
}
func (r *RuntimeSort) Len() int {
return len(r.objs)
}
func (r *RuntimeSort) Swap(i, j int) {
r.objs[i], r.objs[j] = r.objs[j], r.objs[i]
r.origPosition[i], r.origPosition[j] = r.origPosition[j], r.origPosition[i]
}
func isLess(i, j reflect.Value) (bool, error) {
switch i.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return i.Int() < j.Int(), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return i.Uint() < j.Uint(), nil
case reflect.Float32, reflect.Float64:
return i.Float() < j.Float(), nil
case reflect.String:
return i.String() < j.String(), nil
case reflect.Ptr:
return isLess(i.Elem(), j.Elem())
case reflect.Struct:
// sort unversioned.Time
in := i.Interface()
if t, ok := in.(unversioned.Time); ok {
return t.Before(j.Interface().(unversioned.Time)), nil
}
// fallback to the fields comparision
for idx := 0; idx < i.NumField(); idx++ {
less, err := isLess(i.Field(idx), j.Field(idx))
if err != nil || !less {
return less, err
}
}
return true, nil
case reflect.Array, reflect.Slice:
// note: the length of i and j may be different
for idx := 0; idx < integer.IntMin(i.Len(), j.Len()); idx++ {
less, err := isLess(i.Index(idx), j.Index(idx))
if err != nil || !less {
return less, err
}
}
return true, nil
default:
return false, fmt.Errorf("unsortable type: %v", i.Kind())
}
}
func (r *RuntimeSort) Less(i, j int) bool {
iObj := r.objs[i]
jObj := r.objs[j]
parser := jsonpath.New("sorting")
parser.Parse(r.field)
iValues, err := parser.FindResults(reflect.ValueOf(iObj).Elem().Interface())
if err != nil {
glog.Fatalf("Failed to get i values for %#v using %s (%#v)", iObj, r.field, err)
}
jValues, err := parser.FindResults(reflect.ValueOf(jObj).Elem().Interface())
if err != nil {
glog.Fatalf("Failed to get j values for %#v using %s (%v)", jObj, r.field, err)
}
iField := iValues[0][0]
jField := jValues[0][0]
less, err := isLess(iField, jField)
if err != nil {
glog.Fatalf("Field %s in %v is an unsortable type: %s, err: %v", r.field, iObj, iField.Kind().String(), err)
}
return less
}
// Returns the starting (original) position of a particular index. e.g. If OriginalPosition(0) returns 5 than the
// the item currently at position 0 was at position 5 in the original unsorted array.
func (r *RuntimeSort) OriginalPosition(ix int) int {
if ix < 0 || ix > len(r.origPosition) {
return -1
}
return r.origPosition[ix]
}