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122 lines
2.5 KiB
122 lines
2.5 KiB
4 years ago
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/*
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* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 main
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"os"
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"github.com/minio/cli"
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"github.com/tinylib/msgp/msgp"
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)
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var xlHeader = [4]byte{'X', 'L', '2', ' '}
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func main() {
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app := cli.NewApp()
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app.Copyright = "MinIO, Inc."
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app.Usage = "xl.meta to JSON"
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app.HideVersion = true
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app.CustomAppHelpTemplate = `NAME:
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{{.Name}} - {{.Usage}}
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USAGE:
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{{.Name}} {{if .VisibleFlags}}[FLAGS]{{end}} METAFILES...
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{{if .VisibleFlags}}
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GLOBAL FLAGS:
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{{range .VisibleFlags}}{{.}}
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{{end}}{{end}}
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`
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app.HideHelpCommand = true
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app.Flags = []cli.Flag{
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cli.BoolFlag{
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Usage: "Print each file as a separate line without formatting",
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Name: "ndjson",
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},
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}
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app.Action = func(c *cli.Context) error {
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if !c.Args().Present() {
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cli.ShowAppHelp(c)
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return nil
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}
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for _, file := range c.Args() {
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var r io.Reader
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switch file {
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case "-":
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r = os.Stdin
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default:
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f, err := os.Open(file)
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if err != nil {
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return err
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}
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defer f.Close()
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r = f
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}
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// Read header
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var tmp [4]byte
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_, err := io.ReadFull(r, tmp[:])
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if err != nil {
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return err
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}
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if !bytes.Equal(tmp[:], xlHeader[:]) {
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return fmt.Errorf("xlMeta: unknown XLv2 header, expected %v, got %v", xlHeader[:4], tmp[:4])
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}
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// Skip version check for now
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_, err = io.ReadFull(r, tmp[:])
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if err != nil {
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return err
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}
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var buf bytes.Buffer
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_, err = msgp.CopyToJSON(&buf, r)
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if err != nil {
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return err
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}
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if c.Bool("ndjson") {
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fmt.Println(buf.String())
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continue
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}
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var msi map[string]interface{}
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dec := json.NewDecoder(&buf)
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// Use number to preserve integers.
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dec.UseNumber()
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err = dec.Decode(&msi)
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if err != nil {
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return err
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}
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b, err := json.MarshalIndent(msi, "", " ")
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if err != nil {
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return err
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}
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fmt.Println(string(b))
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}
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return nil
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}
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err := app.Run(os.Args)
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if err != nil {
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log.Fatal(err)
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}
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}
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