mirror of https://github.com/k3s-io/k3s
108 lines
2.9 KiB
Go
108 lines
2.9 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubectl
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import (
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"fmt"
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"io"
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"reflect"
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"strings"
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"text/tabwriter"
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"k8s.io/kubernetes/pkg/runtime"
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"k8s.io/kubernetes/pkg/util/jsonpath"
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)
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const (
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columnwidth = 10
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tabwidth = 4
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padding = 3
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padding_character = ' '
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flags = 0
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)
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// Column represents a user specified column
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type Column struct {
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// The header to print above the column, general style is ALL_CAPS
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Header string
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// The pointer to the field in the object to print in JSONPath form
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// e.g. {.ObjectMeta.Name}, see pkg/util/jsonpath for more details.
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FieldSpec string
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}
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// CustomColumnPrinter is a printer that knows how to print arbitrary columns
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// of data from templates specified in the `Columns` array
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type CustomColumnsPrinter struct {
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Columns []Column
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}
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func (s *CustomColumnsPrinter) PrintObj(obj runtime.Object, out io.Writer) error {
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w := tabwriter.NewWriter(out, columnwidth, tabwidth, padding, padding_character, flags)
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headers := make([]string, len(s.Columns))
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for ix := range s.Columns {
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headers[ix] = s.Columns[ix].Header
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}
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fmt.Fprintln(w, strings.Join(headers, "\t"))
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parsers := make([]*jsonpath.JSONPath, len(s.Columns))
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for ix := range s.Columns {
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parsers[ix] = jsonpath.New(fmt.Sprintf("column%d", ix))
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if err := parsers[ix].Parse(s.Columns[ix].FieldSpec); err != nil {
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return err
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}
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}
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if runtime.IsListType(obj) {
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objs, err := runtime.ExtractList(obj)
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if err != nil {
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return err
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}
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for ix := range objs {
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if err := s.printOneObject(objs[ix], parsers, w); err != nil {
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return err
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}
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}
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} else {
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if err := s.printOneObject(obj, parsers, w); err != nil {
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return err
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}
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}
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return w.Flush()
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}
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func (s *CustomColumnsPrinter) printOneObject(obj runtime.Object, parsers []*jsonpath.JSONPath, out io.Writer) error {
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columns := make([]string, len(parsers))
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for ix := range parsers {
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parser := parsers[ix]
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values, err := parser.FindResults(reflect.ValueOf(obj).Elem().Interface())
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if err != nil {
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return err
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}
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if len(values) == 0 || len(values[0]) == 0 {
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fmt.Fprintf(out, "<none>\t")
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}
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valueStrings := []string{}
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for arrIx := range values {
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for valIx := range values[arrIx] {
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valueStrings = append(valueStrings, fmt.Sprintf("%v", values[arrIx][valIx].Interface()))
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}
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}
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columns[ix] = strings.Join(valueStrings, ",")
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}
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fmt.Fprintln(out, strings.Join(columns, "\t"))
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return nil
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}
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