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output.go
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output.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2016-2020 Authors of Cilium
package command
import (
"encoding/json"
"fmt"
"os"
"regexp"
"strings"
"github.com/spf13/cobra"
"k8s.io/client-go/util/jsonpath"
)
var (
outputOpt string
re = regexp.MustCompile(`^jsonpath\=(.*)`)
)
// OutputJSON returns true if the JSON output option was specified
func OutputJSON() bool {
return len(outputOpt) > 0
}
//AddJSONOutput adds the -o|--output option to any cmd to export to json
func AddJSONOutput(cmd *cobra.Command) {
cmd.Flags().StringVarP(&outputOpt, "output", "o", "", "json| jsonpath='{}'")
}
//ForceJSON sets output mode to JSON (for unit tests)
func ForceJSON() {
outputOpt = "json"
}
//PrintOutput receives an interface and dump the data using the --output flag.
//ATM only json or jsonpath. In the future yaml
func PrintOutput(data interface{}) error {
return PrintOutputWithType(data, outputOpt)
}
//PrintOutputWithPatch merges data with patch and dump the data using the --output flag.
func PrintOutputWithPatch(data interface{}, patch interface{}) error {
mergedInterface, err := mergeInterfaces(data, patch)
if err != nil {
return fmt.Errorf("Unable to merge Interfaces:%v", err)
}
return PrintOutputWithType(mergedInterface, outputOpt)
}
func mergeInterfaces(data, patch interface{}) (interface{}, error) {
var i1, i2 interface{}
data1, err := json.Marshal(data)
if err != nil {
return nil, err
}
data2, err := json.Marshal(patch)
if err != nil {
return nil, err
}
err = json.Unmarshal(data1, &i1)
if err != nil {
return nil, err
}
err = json.Unmarshal(data2, &i2)
if err != nil {
return nil, err
}
return recursiveMerge(i1, i2), nil
}
func recursiveMerge(i1, i2 interface{}) interface{} {
switch i1 := i1.(type) {
case map[string]interface{}:
i2, ok := i2.(map[string]interface{})
if !ok {
return i1
}
for k, v2 := range i2 {
if v1, ok := i1[k]; ok {
i1[k] = recursiveMerge(v1, v2)
} else {
i1[k] = v2
}
}
case nil:
i2, ok := i2.(map[string]interface{})
if ok {
return i2
}
}
return i1
}
//PrintOutputWithType receives an interface and dump the data using the --output flag.
//ATM only json or jsonpath. In the future yaml
func PrintOutputWithType(data interface{}, outputType string) error {
if outputType == "json" {
return dumpJSON(data, "")
}
if re.MatchString(outputType) {
return dumpJSON(data, re.ReplaceAllString(outputType, "$1"))
}
return fmt.Errorf("couldn't found output printer")
}
// DumpJSONToString dumps the contents of data into a string. If jsonpath is
// non-empty, will attempt to do jsonpath filtering using said string. Returns a
// string containing the JSON in data, or an error if any JSON marshaling,
// parsing operations fail.
func DumpJSONToString(data interface{}, jsonPath string) (string, error) {
if len(jsonPath) == 0 {
result, err := json.MarshalIndent(data, "", " ")
if err != nil {
fmt.Fprintf(os.Stderr, "Couldn't marshal to json: '%s'\n", err)
return "", err
}
fmt.Println(string(result))
return "", nil
}
parser := jsonpath.New("").AllowMissingKeys(true)
if err := parser.Parse(jsonPath); err != nil {
fmt.Fprintf(os.Stderr, "Couldn't parse jsonpath expression: '%s'\n", err)
return "", err
}
var sb strings.Builder
if err := parser.Execute(&sb, data); err != nil {
fmt.Fprintf(os.Stderr, "Couldn't parse jsonpath expression: '%s'\n", err)
return "", err
}
return sb.String(), nil
}
// dumpJSON dump the data variable to the stdout as json.
// If somethings fail, it'll return an error
// If jsonPath is passed, it'll run the json query over data var.
func dumpJSON(data interface{}, jsonPath string) error {
jsonStr, err := DumpJSONToString(data, jsonPath)
if err != nil {
return err
}
fmt.Println(jsonStr)
return nil
}