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cmd-gen-index.go
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cmd-gen-index.go
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package main
import (
"bytes"
"context"
"fmt"
"io"
"os"
"github.com/google/uuid"
"github.com/grafana/tempo/tempodb/backend"
"github.com/grafana/tempo/tempodb/encoding/common"
v2 "github.com/grafana/tempo/tempodb/encoding/v2"
)
type indexCmd struct {
TenantID string `arg:"" help:"tenant-id within the bucket"`
BlockID string `arg:"" help:"block ID to list"`
backendOptions
}
func ReplayBlockAndGetRecords(meta *backend.BlockMeta, filepath string) ([]common.Record, error, error) {
var replayError error
// replay file to extract records
f, err := os.OpenFile(filepath, os.O_RDONLY, 0644)
if err != nil {
return nil, nil, err
}
dataReader, err := v2.NewDataReader(backend.NewContextReaderWithAllReader(f), meta.Encoding)
if err != nil {
return nil, nil, err
}
defer dataReader.Close()
var buffer []byte
var records []common.Record
objectRW := v2.NewObjectReaderWriter()
currentOffset := uint64(0)
for {
buffer, pageLen, err := dataReader.NextPage(buffer)
if err == io.EOF {
break
}
if err != nil {
replayError = err
break
}
iter := v2.NewIterator(bytes.NewReader(buffer), objectRW)
var lastID common.ID
var iterErr error
for {
var id common.ID
id, _, iterErr = iter.Next(context.TODO())
if iterErr != nil {
break
}
lastID = id
}
if iterErr != io.EOF {
replayError = iterErr
break
}
// make a copy so we don't hold onto the iterator buffer
recordID := append([]byte(nil), lastID...)
records = append(records, common.Record{
ID: recordID,
Start: currentOffset,
Length: pageLen,
})
currentOffset += uint64(pageLen)
}
return records, replayError, nil
}
func VerifyIndex(indexReader common.IndexReader, dataReader common.DataReader) error {
for i := 0; ; i++ {
record, err := indexReader.At(context.TODO(), i)
if err != nil {
return err
}
if record == nil {
break
}
// read data file at record position
_, _, err = dataReader.Read(context.TODO(), []common.Record{*record}, nil, nil)
if err != nil {
fmt.Println("index/data is corrupt, record/data mismatch")
return err
}
}
return nil
}
func (cmd *indexCmd) Run(ctx *globalOptions) error {
blockID, err := uuid.Parse(cmd.BlockID)
if err != nil {
return err
}
r, w, _, err := loadBackend(&cmd.backendOptions, ctx)
if err != nil {
return err
}
meta, err := r.BlockMeta(context.TODO(), blockID, cmd.TenantID)
if err != nil {
return err
}
if meta.Version != v2.VersionString {
return fmt.Errorf("unsupported block version: %s", meta.Version)
}
// replay file to extract records
records, replayError, err := ReplayBlockAndGetRecords(meta, cmd.backendOptions.Bucket+cmd.TenantID+"/"+cmd.BlockID+"/"+dataFilename)
if replayError != nil {
fmt.Println("error replaying block. data file likely corrupt", replayError)
return replayError
}
if err != nil {
fmt.Println("error accessing data/meta file")
return err
}
// write using IndexWriter
indexWriter := v2.NewIndexWriter(int(meta.IndexPageSize))
indexBytes, err := indexWriter.Write(records)
if err != nil {
fmt.Println("error writing records to indexWriter", err)
return err
}
// write to the local backend
err = w.Write(context.TODO(), "index", blockID, cmd.TenantID, indexBytes, false)
if err != nil {
fmt.Println("error writing index to backend", err)
return err
}
fmt.Println("index written to backend successfully")
// verify generated index
// get index file with records
indexFilePath := cmd.backendOptions.Bucket + cmd.TenantID + "/" + cmd.BlockID + "/" + indexFilename
indexFile, err := os.OpenFile(indexFilePath, os.O_RDONLY, 0644)
if err != nil {
fmt.Println("error opening index file")
return err
}
indexReader, err := v2.NewIndexReader(backend.NewContextReaderWithAllReader(indexFile), int(meta.IndexPageSize), len(records))
if err != nil {
fmt.Println("error reading index file")
return err
}
// data reader
dataFilePath := cmd.backendOptions.Bucket + cmd.TenantID + "/" + cmd.BlockID + "/" + dataFilename
dataFile, err := os.OpenFile(dataFilePath, os.O_RDONLY, 0644)
if err != nil {
fmt.Println("error opening data file")
return err
}
dataReader, err := v2.NewDataReader(backend.NewContextReaderWithAllReader(dataFile), meta.Encoding)
if err != nil {
fmt.Println("error reading data file")
return err
}
defer dataReader.Close()
err = VerifyIndex(indexReader, dataReader)
if err != nil {
return err
}
fmt.Println("index verified!")
return nil
}