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main.go
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main.go
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package main
import (
"io/ioutil"
"math"
"os"
"path/filepath"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/pkg/errors"
"github.com/prometheus/prometheus/tsdb"
"github.com/prometheus/prometheus/tsdb/wal"
)
func main() {
logger := log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
logger = level.NewFilter(logger, level.AllowAll())
if err := run(logger); err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
}
func run(logger log.Logger) error {
db, err := tsdb.OpenDBReadOnly("data", logger)
if err != nil {
return errors.Wrap(err, "opening db")
}
dir, err := ioutil.TempDir("data", "tmp")
if err != nil {
return errors.Wrap(err, "creating temporary dir")
}
defer func() {
os.RemoveAll(dir)
}()
if err := db.FlushWAL(dir); err != nil {
return errors.Wrap(err, "flushing WAL")
}
if err := db.Close(); err != nil {
return errors.Wrap(err, "closing db")
}
blocks, err := ioutil.ReadDir(dir)
if err != nil {
return errors.Wrap(err, "reading dir")
}
wlog, err := wal.New(logger, nil, "data/wal", false) // do we care about compression at all
if err != nil {
return errors.Wrap(err, "opening WAL")
}
if err := wlog.Truncate(math.MaxInt64); err != nil {
return errors.Wrap(err, "truncating WAL")
}
if err := wal.DeleteCheckpoints(wlog.Dir(), math.MaxInt32); err != nil {
return errors.Wrap(err, "deleting checkpoints")
}
for _, block := range blocks {
if !block.IsDir() {
continue
}
if err := os.Rename(filepath.Join(dir, block.Name()), filepath.Join("data", block.Name())); err != nil {
return errors.Wrap(err, "deleting dir")
}
}
return nil
}