frostfs-node/cmd/neofs-node/reputation/local/storage.go
Evgenii Stratonikov 71b87155ef [] *: use stdlib errors package
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2021-05-19 16:42:54 +03:00

93 lines
2.1 KiB
Go

package local
import (
"bytes"
"errors"
netmapcore "github.com/nspcc-dev/neofs-node/pkg/core/netmap"
"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
reputationcommon "github.com/nspcc-dev/neofs-node/pkg/services/reputation/common"
trustcontroller "github.com/nspcc-dev/neofs-node/pkg/services/reputation/local/controller"
truststorage "github.com/nspcc-dev/neofs-node/pkg/services/reputation/local/storage"
"github.com/nspcc-dev/neofs-node/pkg/util/logger"
)
type TrustStorage struct {
Log *logger.Logger
Storage *truststorage.Storage
NmSrc netmapcore.Source
LocalKey []byte
}
func (s *TrustStorage) InitIterator(ctx reputationcommon.Context) (trustcontroller.Iterator, error) {
epochStorage, err := s.Storage.DataForEpoch(ctx.Epoch())
if err != nil && !errors.Is(err, truststorage.ErrNoPositiveTrust) {
return nil, err
}
return &TrustIterator{
ctx: ctx,
storage: s,
epochStorage: epochStorage,
}, nil
}
type TrustIterator struct {
ctx reputationcommon.Context
storage *TrustStorage
epochStorage *truststorage.EpochTrustValueStorage
}
func (it *TrustIterator) Iterate(h reputation.TrustHandler) error {
if it.epochStorage != nil {
err := it.epochStorage.Iterate(h)
if !errors.Is(err, truststorage.ErrNoPositiveTrust) {
return err
}
}
nm, err := it.storage.NmSrc.GetNetMapByEpoch(it.ctx.Epoch())
if err != nil {
return err
}
// find out if local node is presented in netmap
localIndex := -1
for i := range nm.Nodes {
if bytes.Equal(nm.Nodes[i].PublicKey(), it.storage.LocalKey) {
localIndex = i
break
}
}
ln := len(nm.Nodes)
if localIndex >= 0 && ln > 0 {
ln--
}
// calculate Pj http://ilpubs.stanford.edu:8090/562/1/2002-56.pdf Chapter 4.5.
p := reputation.TrustOne.Div(reputation.TrustValueFromInt(ln))
for i := range nm.Nodes {
if i == localIndex {
continue
}
trust := reputation.Trust{}
trust.SetPeer(reputation.PeerIDFromBytes(nm.Nodes[i].PublicKey()))
trust.SetValue(p)
trust.SetTrustingPeer(reputation.PeerIDFromBytes(it.storage.LocalKey))
if err := h(trust); err != nil {
return err
}
}
return nil
}