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Fix LatestBeaconRound in Drand

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This commit is contained in:
ChronosX88 2021-06-05 00:14:24 +03:00
parent 2eae45ca38
commit 34c88a8d01
Signed by: ChronosXYZ
GPG Key ID: 085A69A82C8C511A
1 changed files with 33 additions and 21 deletions
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54
beacon/drand/drand.go
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@ -29,25 +29,14 @@ var log = logrus.WithFields(logrus.Fields{
"subsystem": "drand",
})
// DrandResponse structure representing response from drand network
type DrandResponse struct {
// PreviousSig is the previous signature generated
PreviousSig []byte
// Round is the round number this beacon is tied to
Round uint64
// Signature is the BLS deterministic signature over Round || PreviousRand
Signature []byte
// Randomness for specific round generated by Drand
Randomness []byte
}
type DrandBeacon struct {
DrandClient client.Client
PublicKey kyber.Point
drandResultChannel <-chan client.Result
cacheLock sync.Mutex
localCache map[uint64]types.BeaconEntry
cacheLock sync.Mutex
localCache map[uint64]types.BeaconEntry
latestDrandRound uint64
}
func NewDrandBeacon(ps *pubsub.PubSub) (*DrandBeacon, error) {
@ -96,12 +85,26 @@ func NewDrandBeacon(ps *pubsub.PubSub) (*DrandBeacon, error) {
db.PublicKey = drandChain.PublicKey
db.drandResultChannel = db.DrandClient.Watch(context.TODO())
err = db.getLatestDrandResult()
if err != nil {
return nil, err
}
go db.loop(context.TODO())
return db, nil
}
func (db *DrandBeacon) getLatestDrandResult() error {
latestDround, err := db.DrandClient.Get(context.TODO(), 0)
if err != nil {
log.Errorf("failed to get latest drand round: %v", err)
return err
}
db.cacheValue(newBeaconResultFromDrandResult(latestDround))
db.updateLatestDrandRound(latestDround.Round())
return nil
}
func (db *DrandBeacon) loop(ctx context.Context) {
for {
select {
@ -111,7 +114,8 @@ func (db *DrandBeacon) loop(ctx context.Context) {
}
case res := <-db.drandResultChannel:
{
db.cacheValue(types.NewBeaconEntry(res.Round(), res.Randomness(), map[string]interface{}{"signature": res.Signature()}))
db.cacheValue(newBeaconResultFromDrandResult(res))
db.updateLatestDrandRound(res.Round())
}
}
}
@ -163,6 +167,12 @@ func (db *DrandBeacon) getCachedValue(round uint64) *types.BeaconEntry {
return &v
}
func (db *DrandBeacon) updateLatestDrandRound(round uint64) {
db.cacheLock.Lock()
defer db.cacheLock.Unlock()
db.latestDrandRound = round
}
func (db *DrandBeacon) VerifyEntry(curr, prev types.BeaconEntry) error {
if prev.Round == 0 {
return nil
@ -179,11 +189,13 @@ func (db *DrandBeacon) VerifyEntry(curr, prev types.BeaconEntry) error {
}
func (db *DrandBeacon) LatestBeaconRound() uint64 {
latestDround, err := db.DrandClient.Get(context.TODO(), 0)
if err != nil {
log.Errorf("failed to get latest drand round: %w", err)
}
return latestDround.Round()
db.cacheLock.Lock()
defer db.cacheLock.Unlock()
return db.latestDrandRound
}
func newBeaconResultFromDrandResult(res client.Result) types.BeaconEntry {
return types.NewBeaconEntry(res.Round(), res.Randomness(), map[string]interface{}{"signature": res.Signature()})
}
var _ beacon.BeaconAPI = (*DrandBeacon)(nil)