frostfs-node/pkg/local_object_storage/metabase/children.go

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package meta
import (
"context"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/metaerr"
"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
"go.etcd.io/bbolt"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
// GetChildren returns parent -> children map.
// If an object has no children, then map will contain addr -> empty slice value.
func (db *DB) GetChildren(ctx context.Context, addresses []oid.Address) (map[oid.Address][]oid.Address, error) {
var (
startedAt = time.Now()
success = false
)
defer func() {
db.metrics.AddMethodDuration("GetChildren", time.Since(startedAt), success)
}()
_, span := tracing.StartSpanFromContext(ctx, "metabase.GetChildren",
trace.WithAttributes(
attribute.Int("addr_count", len(addresses)),
))
defer span.End()
db.modeMtx.RLock()
defer db.modeMtx.RUnlock()
if db.mode.NoMetabase() {
return nil, ErrDegradedMode
}
result := make(map[oid.Address][]oid.Address, len(addresses))
buffer := make([]byte, bucketKeySize)
err := db.boltDB.View(func(tx *bbolt.Tx) error {
for _, addr := range addresses {
if _, found := result[addr]; found {
continue
}
result[addr] = []oid.Address{}
bkt := tx.Bucket(parentBucketName(addr.Container(), buffer))
if bkt == nil {
continue
}
binObjIDs, err := decodeList(bkt.Get(objectKey(addr.Object(), buffer)))
if err != nil {
return err
}
for _, binObjID := range binObjIDs {
var id oid.ID
if err = id.Decode(binObjID); err != nil {
return err
}
var resultAddress oid.Address
resultAddress.SetContainer(addr.Container())
resultAddress.SetObject(id)
result[addr] = append(result[addr], resultAddress)
}
}
return nil
})
if err != nil {
return nil, metaerr.Wrap(err)
}
success = true
return result, nil
}