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cat_sst.go
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cat_sst.go
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package cmd
import (
"encoding/json"
"fmt"
"io"
"time"
pebblesst "github.com/cockroachdb/pebble/sstable"
"github.com/spf13/cobra"
"github.com/treeverse/lakefs/pkg/catalog"
"github.com/treeverse/lakefs/pkg/graveler"
"github.com/treeverse/lakefs/pkg/graveler/committed"
"github.com/treeverse/lakefs/pkg/graveler/sstable"
"google.golang.org/protobuf/proto"
)
const sstCatTemplate = `{{ .Table | table }}`
var catSstCmd = &cobra.Command{
Use: "cat-sst <sst-file>",
Short: "Explore lakeFS .sst files",
Hidden: true,
Run: func(cmd *cobra.Command, args []string) {
amount := Must(cmd.Flags().GetInt("amount"))
filePath := Must(cmd.Flags().GetString("file"))
iter, props, err := getIterFromFile(filePath)
if err != nil {
DieErr(err)
}
defer iter.Close()
// get props
typ, ok := props[committed.MetadataTypeKey]
if !ok {
DieFmt("could not determine sstable file type")
}
var table *Table
switch typ {
case committed.MetadataMetarangesType:
table, err = formatMetaRangeSSTable(iter, amount)
case committed.MetadataRangesType:
table, err = formatRangeSSTable(iter, amount, props[graveler.EntityTypeKey])
default:
DieFmt("unknown sstable file type: %s", typ)
}
if err != nil {
DieErr(err)
}
// write to stdout
Write(sstCatTemplate, struct {
Table *Table
}{table})
},
}
func getIterFromFile(filePath string) (committed.ValueIterator, map[string]string, error) {
// read from stdin (file has to be seekable/stat-able, so we have this weird wrapper
file, err := OpenByPath(filePath)
if err != nil {
return nil, nil, err
}
defer func() { _ = file.Close() }()
// read all content
content, err := io.ReadAll(file)
if err != nil {
return nil, nil, err
}
// read file descriptor
reader, err := pebblesst.NewMemReader(content, pebblesst.ReaderOptions{})
if err != nil {
return nil, nil, err
}
// create an iterator over the whole thing
iter, err := reader.NewIter(nil, nil)
if err != nil {
return nil, nil, err
}
// wrap it in a Graveler iterator
dummyDeref := func() error { return nil }
return sstable.NewIterator(iter, dummyDeref), reader.Properties.UserProperties, nil
}
func formatEntryRangeSSTable(iter committed.ValueIterator, amount int) (*Table, error) {
rows := make([][]interface{}, 0)
for iter.Next() {
if amount != -1 && len(rows)+1 > amount {
break
}
v := iter.Value()
gv, err := committed.UnmarshalValue(v.Value)
if err != nil {
panic(err)
}
ent, err := catalog.ValueToEntry(gv)
if err != nil {
return nil, err
}
rows = append(rows, []interface{}{
string(v.Key),
fmt.Sprintf("%x", gv.Identity),
fmt.Sprint(ent.GetSize()),
fmt.Sprint(ent.GetETag()),
ent.GetLastModified().AsTime().String(),
ent.GetAddress(),
fmt.Sprint(ent.GetMetadata()),
})
}
if err := iter.Err(); err != nil {
return nil, err
}
return &Table{
Headers: []interface{}{"path", "identity", "size", "etag", "last_modified", "address", "metadata"},
Rows: rows,
}, nil
}
func formatBranchRangeSSTable(iter committed.ValueIterator, amount int) (*Table, error) {
rows := make([][]interface{}, 0)
for iter.Next() {
if amount != -1 && len(rows)+1 > amount {
break
}
v := iter.Value()
gv, err := committed.UnmarshalValue(v.Value)
if err != nil {
return nil, err
}
b := &graveler.BranchData{}
err = proto.Unmarshal(gv.Data, b)
if err != nil {
return nil, err
}
rows = append(rows, []interface{}{b.Id, b.CommitId})
}
if err := iter.Err(); err != nil {
return nil, err
}
return &Table{
Headers: []interface{}{"branch ID", "commit ID"},
Rows: rows,
}, nil
}
func formatTagsRangeSSTable(iter committed.ValueIterator, amount int) (*Table, error) {
rows := make([][]interface{}, 0)
for iter.Next() {
if amount != -1 && len(rows)+1 > amount {
break
}
v := iter.Value()
gv, err := committed.UnmarshalValue(v.Value)
if err != nil {
return nil, err
}
t := &graveler.TagData{}
err = proto.Unmarshal(gv.Data, t)
if err != nil {
return nil, err
}
rows = append(rows, []interface{}{t.Id, t.CommitId})
}
if err := iter.Err(); err != nil {
return nil, err
}
return &Table{
Headers: []interface{}{"tag ID", "commit ID"},
Rows: rows,
}, nil
}
func formatCommitRangeSSTable(iter committed.ValueIterator, amount int) (*Table, error) {
rows := make([][]interface{}, 0)
for iter.Next() {
if amount != -1 && len(rows)+1 > amount {
break
}
v := iter.Value()
gv, err := committed.UnmarshalValue(v.Value)
if err != nil {
return nil, err
}
c := &graveler.CommitData{}
err = proto.Unmarshal(gv.Data, c)
if err != nil {
return nil, err
}
metadata := c.Metadata
if metadata == nil {
metadata = map[string]string{}
}
metadataJSON, err := json.Marshal(metadata)
if err != nil {
return nil, err
}
parents := c.Parents
if parents == nil {
parents = []string{}
}
parentsJSON, err := json.Marshal(parents)
if err != nil {
return nil, err
}
rows = append(rows, []interface{}{
string(v.Key),
c.Committer,
c.Message,
c.CreationDate.AsTime().Format(time.RFC3339),
string(metadataJSON),
string(parentsJSON),
c.MetaRangeId,
c.Version,
c.Generation,
})
}
if err := iter.Err(); err != nil {
return nil, err
}
return &Table{
Headers: []interface{}{"commit ID", "committer", "message", "creation date", "metadata", "parents", "metarange ID", "version", "generation"},
Rows: rows,
}, nil
}
func formatRangeSSTable(iter committed.ValueIterator, amount int, entityType string) (*Table, error) {
switch entityType {
case graveler.EntityTypeBranch:
return formatBranchRangeSSTable(iter, amount)
case graveler.EntityTypeCommit:
return formatCommitRangeSSTable(iter, amount)
case graveler.EntityTypeTag:
return formatTagsRangeSSTable(iter, amount)
default:
return formatEntryRangeSSTable(iter, amount)
}
}
func formatMetaRangeSSTable(iter committed.ValueIterator, amount int) (*Table, error) {
rows := make([][]interface{}, 0)
for iter.Next() {
if amount != -1 && len(rows)+1 > amount {
break
}
v := iter.Value()
gv, err := committed.UnmarshalValue(v.Value)
if err != nil {
panic(err)
}
r, err := committed.UnmarshalRange(gv.Data)
if err != nil {
panic(err)
}
rows = append(rows, []interface{}{
committed.ID(gv.Identity),
string(r.MinKey),
string(r.MaxKey),
fmt.Sprint(r.Count),
fmt.Sprint(r.EstimatedSize),
})
}
if err := iter.Err(); err != nil {
return nil, err
}
return &Table{
Headers: []interface{}{"range_id", "min_key", "max_key", "count", "estimated_size"},
Rows: rows,
}, nil
}
//nolint:gochecknoinits
func init() {
catSstCmd.Flags().Int("amount", -1, "how many records to return, or -1 for all records")
catSstCmd.Flags().StringP("file", "f", "", "path to an sstable file, or \"-\" for stdin")
_ = catSstCmd.MarkFlagRequired("file")
rootCmd.AddCommand(catSstCmd)
}