frostfs-node/pkg/services/reputation/trust.go
Leonard Lyubich a97e08cfd7 [#473] Implement EigenTrust calculations
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2021-04-12 13:25:28 +03:00

100 lines
2 KiB
Go

package reputation
import (
"strconv"
)
// TrustValue represents the numeric value of the node's trust.
type TrustValue float64
const (
// TrustOne is a trust value equal to one.
TrustOne = TrustValue(1)
// TrustZero is a trust value equal to zero.
TrustZero = TrustValue(0)
)
// TrustValueFromFloat64 converts float64 to TrustValue.
func TrustValueFromFloat64(v float64) TrustValue {
return TrustValue(v)
}
// TrustValueFromInt converts int to TrustValue.
func TrustValueFromInt(v int) TrustValue {
return TrustValue(v)
}
func (v TrustValue) String() string {
return strconv.FormatFloat(float64(v), 'f', -1, 64)
}
// Float64 converts TrustValue to float64.
func (v TrustValue) Float64() float64 {
return float64(v)
}
// Add adds v2 to v.
func (v *TrustValue) Add(v2 TrustValue) {
*v = *v + v2
}
// Div returns the result of dividing v by v2.
func (v TrustValue) Div(v2 TrustValue) TrustValue {
return v / v2
}
// Mul multiplies v by v2.
func (v *TrustValue) Mul(v2 TrustValue) {
*v *= v2
}
// IsZero returns true if v equal to zero.
func (v TrustValue) IsZero() bool {
return v == 0
}
// Trust represents peer's trust (reputation).
type Trust struct {
trusting, peer PeerID
val TrustValue
}
// TrustHandler describes the signature of the reputation.Trust
// value handling function.
//
// Termination of processing without failures is usually signaled
// with a zero error, while a specific value may describe the reason
// for failure.
type TrustHandler func(Trust) error
// Value returns peer's trust value.
func (t Trust) Value() TrustValue {
return t.val
}
// SetValue sets peer's trust value.
func (t *Trust) SetValue(val TrustValue) {
t.val = val
}
// Peer returns trusted peer ID.
func (t Trust) Peer() PeerID {
return t.peer
}
// SetPeer sets trusted peer ID.
func (t *Trust) SetPeer(id PeerID) {
t.peer = id
}
// TrustingPeer returns trusting peer ID.
func (t Trust) TrustingPeer() PeerID {
return t.trusting
}
// SetTrustingPeer sets trusting peer ID.
func (t *Trust) SetTrustingPeer(id PeerID) {
t.trusting = id
}