frostfs-node/pkg/services/audit/auditor/util.go
Evgenii Stratonikov 5828f43e52 [] util/rand: use single random source
It is much more convenient to skip source creation.
Also fix some bugs:
1. `cryptoSource.Int63()` now returns number in [0, 1<<63) as required
   by `rand.Source` interface.
2. Replace `cryptoSource.Uint63()` with `cryptoSource.Uint64` to allow
   generate uint64 numbers directly (see rand.Source64 docs).

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2022-01-12 19:29:27 +03:00

18 lines
391 B
Go

package auditor
import (
"github.com/nspcc-dev/neofs-node/pkg/util/rand"
)
// nextRandUint64 returns random uint64 number [0; n) outside exclude map.
// Panics if len(exclude) >= n.
func nextRandUint64(n uint64, exclude map[uint64]struct{}) uint64 {
ln := uint64(len(exclude))
ind := rand.Uint64() % (n - ln)
for i := ind; ; i++ {
if _, ok := exclude[i]; !ok {
return i
}
}
}