frostfs-node/pkg/local_object_storage/blobovnicza/exists.go

package blobovnicza

import (
	"context"

	"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"
)

// Exists check if object with the specified address is stored in b.
func (b *Blobovnicza) Exists(ctx context.Context, addr oid.Address) (bool, error) {
	exists := false

	_, span := tracing.StartSpanFromContext(ctx, "Blobovnicza.Exists",
		trace.WithAttributes(
			attribute.String("path", b.path),
			attribute.String("address", addr.EncodeToString()),
		))
	defer span.End()

	addrKey := addressKey(addr)

	err := b.boltDB.View(func(tx *bbolt.Tx) error {
		return tx.ForEach(func(_ []byte, buck *bbolt.Bucket) error {
			exists = buck.Get(addrKey) != nil
			if exists {
				return errInterruptForEach
			}
			return nil
		})
	})

	if err == errInterruptForEach {
		err = nil
	}
	return exists, err
}