forked from prysmaticlabs/prysm
/
service.go
191 lines (172 loc) · 5.42 KB
/
service.go
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package initialsync
import (
"context"
"time"
"github.com/kevinms/leakybucket-go"
"github.com/pkg/errors"
"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
blockfeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/block"
statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
"github.com/prysmaticlabs/prysm/beacon-chain/db"
"github.com/prysmaticlabs/prysm/beacon-chain/flags"
"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
"github.com/prysmaticlabs/prysm/shared"
"github.com/prysmaticlabs/prysm/shared/params"
"github.com/prysmaticlabs/prysm/shared/roughtime"
"github.com/sirupsen/logrus"
)
var _ = shared.Service(&Service{})
type blockchainService interface {
blockchain.BlockReceiver
blockchain.HeadFetcher
ClearCachedStates()
blockchain.FinalizationFetcher
}
const (
handshakePollingInterval = 5 * time.Second // Polling interval for checking the number of received handshakes.
allowedBlocksPerSecond = 32.0
)
// Config to set up the initial sync service.
type Config struct {
P2P p2p.P2P
DB db.ReadOnlyDatabase
Chain blockchainService
StateNotifier statefeed.Notifier
BlockNotifier blockfeed.Notifier
}
// Service service.
type Service struct {
ctx context.Context
chain blockchainService
p2p p2p.P2P
db db.ReadOnlyDatabase
synced bool
chainStarted bool
stateNotifier statefeed.Notifier
blockNotifier blockfeed.Notifier
blocksRateLimiter *leakybucket.Collector
}
// NewInitialSync configures the initial sync service responsible for bringing the node up to the
// latest head of the blockchain.
func NewInitialSync(cfg *Config) *Service {
return &Service{
ctx: context.Background(),
chain: cfg.Chain,
p2p: cfg.P2P,
db: cfg.DB,
stateNotifier: cfg.StateNotifier,
blockNotifier: cfg.BlockNotifier,
blocksRateLimiter: leakybucket.NewCollector(allowedBlocksPerSecond, allowedBlocksPerSecond, false /* deleteEmptyBuckets */),
}
}
// Start the initial sync service.
func (s *Service) Start() {
var genesis time.Time
headState, err := s.chain.HeadState(s.ctx)
if headState == nil || err != nil {
// Wait for state to be initialized.
stateChannel := make(chan *feed.Event, 1)
stateSub := s.stateNotifier.StateFeed().Subscribe(stateChannel)
defer stateSub.Unsubscribe()
genesisSet := false
for !genesisSet {
select {
case event := <-stateChannel:
if event.Type == statefeed.Initialized {
data := event.Data.(*statefeed.InitializedData)
log.WithField("starttime", data.StartTime).Debug("Received state initialized event")
genesis = data.StartTime
genesisSet = true
}
case <-s.ctx.Done():
log.Debug("Context closed, exiting goroutine")
return
case err := <-stateSub.Err():
log.WithError(err).Error("Subscription to state notifier failed")
return
}
}
stateSub.Unsubscribe()
} else {
genesis = time.Unix(int64(headState.GenesisTime()), 0)
}
if genesis.After(roughtime.Now()) {
log.WithField(
"genesis time",
genesis,
).Warn("Genesis time is in the future - waiting to start sync...")
time.Sleep(roughtime.Until(genesis))
}
s.chainStarted = true
currentSlot := helpers.SlotsSince(genesis)
if helpers.SlotToEpoch(currentSlot) == 0 {
log.Info("Chain started within the last epoch - not syncing")
s.synced = true
return
}
log.Info("Starting initial chain sync...")
// Are we already in sync, or close to it?
if helpers.SlotToEpoch(s.chain.HeadSlot()) == helpers.SlotToEpoch(currentSlot) {
log.Info("Already synced to the current chain head")
s.synced = true
return
}
s.waitForMinimumPeers()
if err := s.roundRobinSync(genesis); err != nil {
panic(err)
}
log.Infof("Synced up to slot %d", s.chain.HeadSlot())
s.synced = true
}
// Stop initial sync.
func (s *Service) Stop() error {
return nil
}
// Status of initial sync.
func (s *Service) Status() error {
if !s.synced && s.chainStarted {
return errors.New("syncing")
}
return nil
}
// Syncing returns true if initial sync is still running.
func (s *Service) Syncing() bool {
return !s.synced
}
// Resync allows a node to start syncing again if it has fallen
// behind the current network head.
func (s *Service) Resync() error {
// set it to false since we are syncing again
s.synced = false
defer func() { s.synced = true }() // Reset it at the end of the method.
headState, err := s.chain.HeadState(context.Background())
if err != nil {
return errors.Wrap(err, "could not retrieve head state")
}
genesis := time.Unix(int64(headState.GenesisTime()), 0)
s.waitForMinimumPeers()
err = s.roundRobinSync(genesis)
if err != nil {
log = log.WithError(err)
}
log.WithField("slot", s.chain.HeadSlot()).Info("Resync attempt complete")
return nil
}
func (s *Service) waitForMinimumPeers() {
required := params.BeaconConfig().MaxPeersToSync
if flags.Get().MinimumSyncPeers < required {
required = flags.Get().MinimumSyncPeers
}
for {
_, _, peers := s.p2p.Peers().BestFinalized(params.BeaconConfig().MaxPeersToSync, s.chain.FinalizedCheckpt().Epoch)
if len(peers) >= required {
break
}
log.WithFields(logrus.Fields{
"suitable": len(peers),
"required": required}).Info("Waiting for enough suitable peers before syncing")
time.Sleep(handshakePollingInterval)
}
}