// Open opens the reader.
func (r *Reader) Open() error {
// Open underlying storage.
db, err := bolt.Open(r.path, 0666, &bolt.Options{Timeout: 1 * time.Second})
if err != nil {
return err
}
r.db = db
// Load fields.
if err := r.db.View(func(tx *bolt.Tx) error {
meta := tx.Bucket([]byte("fields"))
c := meta.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
mf := &tsdb.MeasurementFields{}
if err := mf.UnmarshalBinary(v); err != nil {
return err
}
r.fields[string(k)] = mf
r.codecs[string(k)] = tsdb.NewFieldCodec(mf.Fields)
}
return nil
}); err != nil {
return err
}
seriesSet := make(map[string]bool)
// ignore series index and find all series in this shard
if err := r.db.View(func(tx *bolt.Tx) error {
tx.ForEach(func(name []byte, _ *bolt.Bucket) error {
key := string(name)
if !excludedBuckets[key] {
seriesSet[key] = true
}
return nil
})
return nil
}); err != nil {
return err
}
r.tx, err = r.db.Begin(false)
if err != nil {
return err
}
// Create cursor for each field of each series.
for s := range seriesSet {
measurement := tsdb.MeasurementFromSeriesKey(s)
fields := r.fields[measurement]
if fields == nil {
r.stats.IncrFiltered()
continue
}
for _, f := range fields.Fields {
c := newCursor(r.tx, s, f.Name, r.codecs[measurement])
c.SeekTo(0)
r.cursors = append(r.cursors, c)
}
}
sort.Sort(cursors(r.cursors))
return nil
}
// Open opens the reader.
func (r *Reader) Open() error {
// Open underlying storage.
db, err := bolt.Open(r.path, 0666, &bolt.Options{Timeout: 1 * time.Second})
if err != nil {
return err
}
r.db = db
seriesSet := make(map[string]bool)
if err := r.db.View(func(tx *bolt.Tx) error {
var data []byte
meta := tx.Bucket([]byte("meta"))
if meta == nil {
// No data in this shard.
return nil
}
pointsBucket := tx.Bucket([]byte("points"))
if pointsBucket == nil {
return nil
}
if err := pointsBucket.ForEach(func(key, _ []byte) error {
seriesSet[string(key)] = true
return nil
}); err != nil {
return err
}
buf := meta.Get([]byte("fields"))
if buf == nil {
// No data in this shard.
return nil
}
data, err = snappy.Decode(nil, buf)
if err != nil {
return err
}
if err := json.Unmarshal(data, &r.fields); err != nil {
return err
}
return nil
}); err != nil {
return err
}
// Build the codec for each measurement.
for k, v := range r.fields {
r.codecs[k] = tsdb.NewFieldCodec(v.Fields)
}
r.tx, err = r.db.Begin(false)
if err != nil {
return err
}
// Create cursor for each field of each series.
for s := range seriesSet {
measurement := tsdb.MeasurementFromSeriesKey(s)
fields := r.fields[measurement]
if fields == nil {
r.stats.IncrFiltered()
continue
}
for _, f := range fields.Fields {
c := newCursor(r.tx, s, f.Name, r.codecs[measurement])
if c == nil {
continue
}
c.SeekTo(0)
r.cursors = append(r.cursors, c)
}
}
sort.Sort(cursors(r.cursors))
return nil
}