52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
package beacon
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import (
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"context"
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"fmt"
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"github.com/Secured-Finance/dione/types"
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)
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type BeaconResult struct {
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Entry types.BeaconEntry
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Err error
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}
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type BeaconNetworks []BeaconNetwork
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func (bn BeaconNetworks) BeaconNetworkForRound(e uint64) BeaconAPI {
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for i := len(bn) - 1; i >= 0; i-- {
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bp := bn[i]
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if e >= bp.Start {
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return bp.Beacon
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}
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}
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return bn[0].Beacon
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}
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type BeaconNetwork struct {
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Start uint64
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Beacon BeaconAPI
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}
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// BeaconAPI represents a system that provides randomness.
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// Other components interrogate the BeaconAPI to acquire randomness that's
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// valid for a specific chain epoch. Also to verify beacon entries that have
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// been posted on chain.
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type BeaconAPI interface {
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Entry(context.Context, uint64) <-chan BeaconResult
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VerifyEntry(types.BeaconEntry, types.BeaconEntry) error
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LatestBeaconRound() uint64
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}
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// ValidateBlockBeacons is a function that verifies block randomness
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func (bn BeaconNetworks) ValidateBlockBeacons(beaconNetworks BeaconNetworks, curEntry, prevEntry types.BeaconEntry) error {
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defaultBeacon := beaconNetworks.BeaconNetworkForRound(0)
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if err := defaultBeacon.VerifyEntry(curEntry, prevEntry); err != nil {
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return fmt.Errorf("beacon entry was invalid: %w", err)
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}
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return nil
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}
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