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metadata.go
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metadata.go
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package cmd
import (
"context"
"encoding/json"
"fmt"
"io"
"math"
"os"
"strings"
"github.com/foxglove/mcap/go/cli/mcap/utils"
"github.com/foxglove/mcap/go/mcap"
"github.com/spf13/cobra"
)
var (
addMetadataKeyValues []string
addMetadataName string
)
var (
getMetadataName string
)
func printMetadata(w io.Writer, r io.ReadSeeker, info *mcap.Info) error {
rows := make([][]string, 0, len(info.MetadataIndexes))
rows = append(rows, []string{
"name",
"offset",
"length",
"metadata",
})
for _, idx := range info.MetadataIndexes {
offset := idx.Offset + 1 + 8
if offset > math.MaxInt64 {
return fmt.Errorf("metadata offset out of range: %v", offset)
}
_, err := r.Seek(int64(offset), io.SeekStart)
if err != nil {
return fmt.Errorf("failed to seek to metadata record: %w", err)
}
record := make([]byte, idx.Length)
_, err = r.Read(record)
if err != nil {
return fmt.Errorf("failed to read metadata record: %w", err)
}
metadata, err := mcap.ParseMetadata(record)
if err != nil {
return fmt.Errorf("failed to parse metadata: %w", err)
}
jsonSerialized, err := json.Marshal(metadata.Metadata)
if err != nil {
return fmt.Errorf("failed to marshal metadata to JSON: %w", err)
}
rows = append(rows, []string{
idx.Name,
fmt.Sprintf("%d", idx.Offset),
fmt.Sprintf("%d", idx.Length),
string(jsonSerialized),
})
}
utils.FormatTable(w, rows)
return nil
}
var listMetadataCmd = &cobra.Command{
Use: "metadata",
Short: "List metadata in an MCAP file",
Run: func(_ *cobra.Command, args []string) {
ctx := context.Background()
if len(args) != 1 {
die("Unexpected number of args")
}
filename := args[0]
err := utils.WithReader(ctx, filename, func(_ bool, rs io.ReadSeeker) error {
reader, err := mcap.NewReader(rs)
if err != nil {
return fmt.Errorf("failed to build mcap reader: %w", err)
}
defer reader.Close()
info, err := reader.Info()
if err != nil {
return fmt.Errorf("failed to read info: %w", err)
}
return printMetadata(os.Stdout, rs, info)
})
if err != nil {
die("failed to list metadata: %s", err)
}
},
}
var addMetadataCmd = &cobra.Command{
Use: "metadata",
Short: "Add metadata to an MCAP file",
Run: func(_ *cobra.Command, args []string) {
if len(args) != 1 {
die("Unexpected number of args")
}
filename := args[0]
f, err := os.OpenFile(filename, os.O_RDWR, os.ModePerm)
if err != nil {
die("failed to open file: %s", err)
}
defer f.Close()
metadata := make(map[string]string)
for _, kv := range addMetadataKeyValues {
parts := strings.FieldsFunc(kv, func(c rune) bool {
return c == '='
})
if len(parts) != 2 {
die("failed to parse key/value %s", kv)
}
metadata[parts[0]] = parts[1]
}
err = utils.AmendMCAP(f,
nil,
[]*mcap.Metadata{
{
Name: addMetadataName,
Metadata: metadata,
},
},
)
if err != nil {
die("failed to add metadata: %s. You may need to run `mcap recover` to repair the file.", err)
}
},
}
var getMetadataCmd = &cobra.Command{
Use: "metadata",
Short: "get metadata by name",
Run: func(_ *cobra.Command, args []string) {
ctx := context.Background()
if len(args) != 1 {
die("Unexpected number of args")
}
filename := args[0]
err := utils.WithReader(ctx, filename, func(_ bool, rs io.ReadSeeker) error {
reader, err := mcap.NewReader(rs)
if err != nil {
return fmt.Errorf("failed to build reader: %w", err)
}
defer reader.Close()
info, err := reader.Info()
if err != nil {
return fmt.Errorf("failed to collect mcap info: %w", err)
}
output := make(map[string]string)
metadataIndexes := make(map[string][]*mcap.MetadataIndex)
for _, idx := range info.MetadataIndexes {
metadataIndexes[idx.Name] = append(metadataIndexes[idx.Name], idx)
}
indexes, ok := metadataIndexes[getMetadataName]
if !ok {
return fmt.Errorf("metadata %s does not exist", getMetadataName)
}
for _, idx := range indexes {
_, err = rs.Seek(int64(idx.Offset+1+8), io.SeekStart)
if err != nil {
return fmt.Errorf("failed to seek to metadata record at %d: %w", idx.Offset, err)
}
data := make([]byte, idx.Length)
_, err = io.ReadFull(rs, data)
if err != nil {
return fmt.Errorf("failed to read metadata record: %w", err)
}
record, err := mcap.ParseMetadata(data)
if err != nil {
return fmt.Errorf("failed to parse metadata: %w", err)
}
for k, v := range record.Metadata {
output[k] = v
}
}
jsonBytes, err := json.Marshal(output)
if err != nil {
return fmt.Errorf("failed to marshal output to JSON: %w", err)
}
prettyJSON, err := utils.PrettyJSON(jsonBytes)
if err != nil {
return fmt.Errorf("failed to pretty JSON: %w", err)
}
_, err = os.Stdout.WriteString(prettyJSON + "\n")
if err != nil {
return fmt.Errorf("failed to write metadata to output: %w", err)
}
return nil
})
if err != nil {
die("failed to fetch metadata: %s", err)
}
},
}
func init() {
listCmd.AddCommand(listMetadataCmd)
addCmd.AddCommand(addMetadataCmd)
addMetadataCmd.PersistentFlags().StringVarP(&addMetadataName, "name", "n", "", "name of metadata record to add")
addMetadataCmd.PersistentFlags().StringSliceVarP(&addMetadataKeyValues, "key", "k", []string{}, "key=value pair")
err := addMetadataCmd.MarkPersistentFlagRequired("name")
if err != nil {
die("failed to mark --name flag as required: %s", err)
}
getCmd.AddCommand(getMetadataCmd)
getMetadataCmd.PersistentFlags().StringVarP(&getMetadataName, "name", "n", "", "name of metadata record to create")
err = getMetadataCmd.MarkPersistentFlagRequired("name")
if err != nil {
die("failed to mark --name flag as required: %s", err)
}
}