[augerctl] Support for the json format as output

augerctl/command/get_command.go

@@ -84,7 +84,7 @@ func newCtlGetCommand(f *flagpole) *cobra.Command {
 		},
 	}
 
-	cmd.Flags().StringVarP(&flags.Output, "output", "o", "yaml", "output format. One of: (yaml).")
+	cmd.Flags().StringVarP(&flags.Output, "output", "o", "yaml", "output format. One of: (yaml, json).")
 	cmd.Flags().StringVarP(&flags.Namespace, "namespace", "n", "", "namespace of resource")
 	cmd.Flags().Int64Var(&flags.ChunkSize, "chunk-size", 500, "chunk size of the list pager")
 	cmd.Flags().StringVar(&flags.Prefix, "prefix", "/registry", "prefix to prepend to the resource")

augerctl/command/printer.go

@@ -17,13 +17,9 @@ limitations under the License.
 package command
 
 import (
-	"errors"
-	"fmt"
 	"io"
 
 	"github.com/etcd-io/auger/pkg/client"
-	"github.com/etcd-io/auger/pkg/encoding"
-	"github.com/etcd-io/auger/pkg/scheme"
 )
 
 type Printer interface {
@@ -34,31 +30,8 @@ func NewPrinter(w io.Writer, printerType string) Printer {
 	switch printerType {
 	case "yaml":
 		return &yamlPrinter{w: w}
-	}
-	return nil
-}
-
-func formatResponse(w io.Writer, outMediaType string, kv *client.KeyValue) error {
-	value := kv.Value
-	inMediaType, _, err := encoding.DetectAndExtract(value)
-	if err != nil {
-		_, err0 := fmt.Fprintf(w, "---\n# %s | raw | %v\n# %s\n", kv.Key, err, value)
-		if err0 != nil {
-			return errors.Join(err, err0)
-		}
-		return nil
-	}
-	data, _, err := encoding.Convert(scheme.Codecs, inMediaType, outMediaType, value)
-	if err != nil {
-		_, err0 := fmt.Fprintf(w, "---\n# %s | raw | %v\n# %s\n", kv.Key, err, value)
-		if err0 != nil {
-			return errors.Join(err, err0)
-		}
-		return nil
-	}
-	_, err = fmt.Fprintf(w, "---\n# %s | %s\n%s\n", kv.Key, inMediaType, data)
-	if err != nil {
-		return err
+	case "json":
+		return &jsonPrinter{w: w}
 	}
 	return nil
 }

augerctl/command/printer_json.go

@@ -0,0 +1,46 @@
+/*
+Copyright 2024 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 command
+
+import (
+	"io"
+
+	"github.com/etcd-io/auger/pkg/client"
+	"github.com/etcd-io/auger/pkg/encoding"
+	"github.com/etcd-io/auger/pkg/scheme"
+)
+
+type jsonPrinter struct {
+	w io.Writer
+}
+
+func (p *jsonPrinter) Print(kv *client.KeyValue) error {
+	value := kv.Value
+	inMediaType, _, err := encoding.DetectAndExtract(value)
+	if err != nil {
+		return err
+	}
+	data, _, err := encoding.Convert(scheme.Codecs, inMediaType, encoding.JsonMediaType, value)
+	if err != nil {
+		return err
+	}
+	_, err = p.w.Write(data)
+	if err != nil {
+		return err
+	}
+	return nil
+}

augerctl/command/printer_yaml.go

@@ -17,16 +17,40 @@ limitations under the License.
 package command
 
 import (
+	"errors"
+	"fmt"
 	"io"
 
 	"github.com/etcd-io/auger/pkg/client"
 	"github.com/etcd-io/auger/pkg/encoding"
+	"github.com/etcd-io/auger/pkg/scheme"
 )
 
 type yamlPrinter struct {
 	w io.Writer
 }
 
 func (p *yamlPrinter) Print(kv *client.KeyValue) error {
-	return formatResponse(p.w, encoding.YamlMediaType, kv)
+	value := kv.Value
+	inMediaType, _, err := encoding.DetectAndExtract(value)
+	if err != nil {
+		_, err0 := fmt.Fprintf(p.w, "---\n# %s | raw | %v\n# %s\n", kv.Key, err, value)
+		if err0 != nil {
+			return errors.Join(err, err0)
+		}
+		return nil
+	}
+	data, _, err := encoding.Convert(scheme.Codecs, inMediaType, encoding.YamlMediaType, value)
+	if err != nil {
+		_, err0 := fmt.Fprintf(p.w, "---\n# %s | raw | %v\n# %s\n", kv.Key, err, value)
+		if err0 != nil {
+			return errors.Join(err, err0)
+		}
+		return nil
+	}
+	_, err = fmt.Fprintf(p.w, "---\n# %s | %s\n%s\n", kv.Key, inMediaType, data)
+	if err != nil {
+		return err
+	}
+	return nil
 }