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kube_out.go
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kube_out.go
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package cli
import (
"bytes"
"encoding/json"
"github.com/jedib0t/go-pretty/v6/table"
YamlV3 "gopkg.in/yaml.v3"
MetaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
KGeneric "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
)
// Frequently encode and decode is resource waste.
func outputFormatFactory(typ kubeResultOutFormatType) visitorFn {
var v visitorFn
switch typ {
case kubeOutYaml:
v = outAsYaml
case kubeOutJson:
v = outAsJson
case kubeOutTable:
fallthrough
default:
v = outAsTable
}
return noResultInterceptor(v)
}
func outAsTable(info *commandContext, err error) error {
var tabObj = MetaV1.Table{}
if err = json.Unmarshal(info.genericObj, &tabObj); err != nil {
return err
}
w := table.NewWriter()
th := make(table.Row, 0, 8)
for _, h := range tabObj.ColumnDefinitions {
th = append(th, h.Name)
}
w.AppendHeader(th)
trList := make([]table.Row, 0, 8)
for _, r := range tabObj.Rows {
trList = append(trList, r.Cells)
}
w.AppendRows(trList)
info.result = w.Render()
return nil
}
func outAsJson(info *commandContext, err error) error {
info.result = bytes.NewBuffer(info.genericObj).String()
return nil
}
func outAsYaml(info *commandContext, err error) error {
var y = KGeneric.Unstructured{}
if err = json.Unmarshal(info.genericObj, &y); err != nil {
return err
}
var data []byte
if data, err = YamlV3.Marshal(&y.Object); err != nil {
return err
}
info.result = bytes.NewBuffer(data).String()
return nil
}
func noResultInterceptor(fn visitorFn) visitorFn {
return func(info *commandContext, err error) error {
if len(info.genericObj) == 0 {
return errCliExecEmptyResult
}
return fn(info, err)
}
}