mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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639e3072fe
* fix cancelling * Merge branch 'master' into cancelServices * Merge refs/heads/master into cancelServices * Merge refs/heads/master into cancelServices
218 lines
6.1 KiB
Go
218 lines
6.1 KiB
Go
package initialsync
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import (
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"context"
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"time"
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"github.com/kevinms/leakybucket-go"
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"github.com/pkg/errors"
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"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
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blockfeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/block"
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statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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"github.com/prysmaticlabs/prysm/beacon-chain/db"
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"github.com/prysmaticlabs/prysm/beacon-chain/flags"
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"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
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"github.com/prysmaticlabs/prysm/shared"
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"github.com/prysmaticlabs/prysm/shared/params"
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"github.com/prysmaticlabs/prysm/shared/roughtime"
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"github.com/sirupsen/logrus"
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)
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var _ = shared.Service(&Service{})
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type blockchainService interface {
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blockchain.BlockReceiver
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blockchain.HeadFetcher
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ClearCachedStates()
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blockchain.FinalizationFetcher
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}
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const (
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handshakePollingInterval = 5 * time.Second // Polling interval for checking the number of received handshakes.
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allowedBlocksPerSecond = 32.0
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)
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// Config to set up the initial sync service.
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type Config struct {
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P2P p2p.P2P
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DB db.ReadOnlyDatabase
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Chain blockchainService
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StateNotifier statefeed.Notifier
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BlockNotifier blockfeed.Notifier
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}
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// Service service.
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type Service struct {
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ctx context.Context
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cancel context.CancelFunc
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chain blockchainService
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p2p p2p.P2P
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db db.ReadOnlyDatabase
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synced bool
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chainStarted bool
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stateNotifier statefeed.Notifier
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blockNotifier blockfeed.Notifier
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blocksRateLimiter *leakybucket.Collector
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}
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// NewInitialSync configures the initial sync service responsible for bringing the node up to the
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// latest head of the blockchain.
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func NewInitialSync(cfg *Config) *Service {
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ctx, cancel := context.WithCancel(context.Background())
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return &Service{
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ctx: ctx,
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cancel: cancel,
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chain: cfg.Chain,
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p2p: cfg.P2P,
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db: cfg.DB,
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stateNotifier: cfg.StateNotifier,
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blockNotifier: cfg.BlockNotifier,
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blocksRateLimiter: leakybucket.NewCollector(allowedBlocksPerSecond, allowedBlocksPerSecond, false /* deleteEmptyBuckets */),
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}
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}
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// Start the initial sync service.
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func (s *Service) Start() {
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var genesis time.Time
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headState, err := s.chain.HeadState(s.ctx)
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if headState == nil || err != nil {
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// Wait for state to be initialized.
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stateChannel := make(chan *feed.Event, 1)
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stateSub := s.stateNotifier.StateFeed().Subscribe(stateChannel)
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defer stateSub.Unsubscribe()
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genesisSet := false
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for !genesisSet {
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select {
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case event := <-stateChannel:
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if event.Type == statefeed.Initialized {
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data, ok := event.Data.(*statefeed.InitializedData)
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if !ok {
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log.Error("Event feed data is not type *statefeed.InitializedData")
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continue
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}
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log.WithField("starttime", data.StartTime).Debug("Received state initialized event")
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genesis = data.StartTime
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genesisSet = true
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}
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case <-s.ctx.Done():
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log.Debug("Context closed, exiting goroutine")
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return
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case err := <-stateSub.Err():
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log.WithError(err).Error("Subscription to state notifier failed")
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return
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}
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}
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stateSub.Unsubscribe()
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} else {
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genesis = time.Unix(int64(headState.GenesisTime()), 0)
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}
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if genesis.After(roughtime.Now()) {
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log.WithField(
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"genesis time",
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genesis,
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).Warn("Genesis time is in the future - waiting to start sync...")
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time.Sleep(roughtime.Until(genesis))
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}
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s.chainStarted = true
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currentSlot := helpers.SlotsSince(genesis)
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if helpers.SlotToEpoch(currentSlot) == 0 {
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log.Info("Chain started within the last epoch - not syncing")
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s.synced = true
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s.stateNotifier.StateFeed().Send(&feed.Event{
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Type: statefeed.Synced,
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Data: &statefeed.SyncedData{
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StartTime: genesis,
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},
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})
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return
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}
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log.Info("Starting initial chain sync...")
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// Are we already in sync, or close to it?
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if helpers.SlotToEpoch(s.chain.HeadSlot()) == helpers.SlotToEpoch(currentSlot) {
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log.Info("Already synced to the current chain head")
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s.synced = true
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s.stateNotifier.StateFeed().Send(&feed.Event{
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Type: statefeed.Synced,
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Data: &statefeed.SyncedData{
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StartTime: genesis,
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},
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})
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return
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}
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s.waitForMinimumPeers()
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if err := s.roundRobinSync(genesis); err != nil {
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panic(err)
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}
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log.Infof("Synced up to slot %d", s.chain.HeadSlot())
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s.synced = true
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s.stateNotifier.StateFeed().Send(&feed.Event{
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Type: statefeed.Synced,
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Data: &statefeed.SyncedData{
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StartTime: genesis,
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},
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})
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}
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// Stop initial sync.
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func (s *Service) Stop() error {
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s.cancel()
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return nil
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}
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// Status of initial sync.
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func (s *Service) Status() error {
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if !s.synced && s.chainStarted {
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return errors.New("syncing")
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}
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return nil
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}
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// Syncing returns true if initial sync is still running.
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func (s *Service) Syncing() bool {
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return !s.synced
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}
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// Resync allows a node to start syncing again if it has fallen
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// behind the current network head.
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func (s *Service) Resync() error {
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// set it to false since we are syncing again
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s.synced = false
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defer func() { s.synced = true }() // Reset it at the end of the method.
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headState, err := s.chain.HeadState(context.Background())
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if err != nil {
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return errors.Wrap(err, "could not retrieve head state")
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}
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genesis := time.Unix(int64(headState.GenesisTime()), 0)
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s.waitForMinimumPeers()
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err = s.roundRobinSync(genesis)
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if err != nil {
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log = log.WithError(err)
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}
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log.WithField("slot", s.chain.HeadSlot()).Info("Resync attempt complete")
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return nil
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}
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func (s *Service) waitForMinimumPeers() {
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required := params.BeaconConfig().MaxPeersToSync
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if flags.Get().MinimumSyncPeers < required {
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required = flags.Get().MinimumSyncPeers
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}
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for {
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_, _, peers := s.p2p.Peers().BestFinalized(params.BeaconConfig().MaxPeersToSync, s.chain.FinalizedCheckpt().Epoch)
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if len(peers) >= required {
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break
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}
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log.WithFields(logrus.Fields{
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"suitable": len(peers),
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"required": required}).Info("Waiting for enough suitable peers before syncing")
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time.Sleep(handshakePollingInterval)
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}
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}
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