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service.go
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service.go
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package sync
import (
"context"
"sync"
"time"
"github.com/prysmaticlabs/prysm/beacon-chain/flags"
lru "github.com/hashicorp/golang-lru"
"github.com/kevinms/leakybucket-go"
"github.com/pkg/errors"
ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
"github.com/prysmaticlabs/prysm/beacon-chain/cache"
blockfeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/block"
"github.com/prysmaticlabs/prysm/beacon-chain/core/feed/operation"
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/operations/attestations"
"github.com/prysmaticlabs/prysm/beacon-chain/operations/slashings"
"github.com/prysmaticlabs/prysm/beacon-chain/operations/voluntaryexits"
"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
"github.com/prysmaticlabs/prysm/shared"
"github.com/prysmaticlabs/prysm/shared/runutil"
)
var _ = shared.Service(&Service{})
var allowedBlocksPerSecond float64
var allowedBlocksBurst int64
const rangeLimit = 1000
const seenBlockSize = 1000
const seenAttSize = 10000
const seenExitSize = 100
const seenAttesterSlashingSize = 100
const seenProposerSlashingSize = 100
// Config to set up the regular sync service.
type Config struct {
P2P p2p.P2P
DB db.NoHeadAccessDatabase
AttPool attestations.Pool
ExitPool *voluntaryexits.Pool
SlashingPool *slashings.Pool
Chain blockchainService
InitialSync Checker
StateNotifier statefeed.Notifier
BlockNotifier blockfeed.Notifier
AttestationNotifier operation.Notifier
StateSummaryCache *cache.StateSummaryCache
StateGen *stategen.State
}
// This defines the interface for interacting with block chain service
type blockchainService interface {
blockchain.BlockReceiver
blockchain.HeadFetcher
blockchain.FinalizationFetcher
blockchain.ForkFetcher
blockchain.AttestationReceiver
blockchain.TimeFetcher
blockchain.GenesisFetcher
}
// Service is responsible for handling all run time p2p related operations as the
// main entry point for network messages.
type Service struct {
ctx context.Context
cancel context.CancelFunc
p2p p2p.P2P
db db.NoHeadAccessDatabase
attPool attestations.Pool
exitPool *voluntaryexits.Pool
slashingPool *slashings.Pool
chain blockchainService
slotToPendingBlocks map[uint64]*ethpb.SignedBeaconBlock
seenPendingBlocks map[[32]byte]bool
blkRootToPendingAtts map[[32]byte][]*ethpb.SignedAggregateAttestationAndProof
pendingAttsLock sync.RWMutex
pendingQueueLock sync.RWMutex
chainStarted bool
initialSync Checker
validateBlockLock sync.RWMutex
stateNotifier statefeed.Notifier
blockNotifier blockfeed.Notifier
blocksRateLimiter *leakybucket.Collector
attestationNotifier operation.Notifier
seenBlockLock sync.RWMutex
seenBlockCache *lru.Cache
seenAttestationLock sync.RWMutex
seenAttestationCache *lru.Cache
seenExitLock sync.RWMutex
seenExitCache *lru.Cache
seenProposerSlashingLock sync.RWMutex
seenProposerSlashingCache *lru.Cache
seenAttesterSlashingLock sync.RWMutex
seenAttesterSlashingCache *lru.Cache
stateSummaryCache *cache.StateSummaryCache
stateGen *stategen.State
}
// NewRegularSync service.
func NewRegularSync(cfg *Config) *Service {
// Intialize block limits.
allowedBlocksPerSecond = float64(flags.Get().BlockBatchLimit)
allowedBlocksBurst = int64(10 * allowedBlocksPerSecond)
ctx, cancel := context.WithCancel(context.Background())
r := &Service{
ctx: ctx,
cancel: cancel,
db: cfg.DB,
p2p: cfg.P2P,
attPool: cfg.AttPool,
exitPool: cfg.ExitPool,
slashingPool: cfg.SlashingPool,
chain: cfg.Chain,
initialSync: cfg.InitialSync,
attestationNotifier: cfg.AttestationNotifier,
slotToPendingBlocks: make(map[uint64]*ethpb.SignedBeaconBlock),
seenPendingBlocks: make(map[[32]byte]bool),
blkRootToPendingAtts: make(map[[32]byte][]*ethpb.SignedAggregateAttestationAndProof),
stateNotifier: cfg.StateNotifier,
blockNotifier: cfg.BlockNotifier,
stateSummaryCache: cfg.StateSummaryCache,
stateGen: cfg.StateGen,
blocksRateLimiter: leakybucket.NewCollector(allowedBlocksPerSecond, allowedBlocksBurst, false /* deleteEmptyBuckets */),
}
r.registerRPCHandlers()
go r.registerSubscribers()
return r
}
// Start the regular sync service.
func (r *Service) Start() {
if err := r.initCaches(); err != nil {
panic(err)
}
r.p2p.AddConnectionHandler(r.reValidatePeer, r.sendGenericGoodbyeMessage)
r.p2p.AddDisconnectionHandler(r.removeDisconnectedPeerStatus)
r.p2p.AddPingMethod(r.sendPingRequest)
r.processPendingBlocksQueue()
r.processPendingAttsQueue()
r.maintainPeerStatuses()
r.resyncIfBehind()
// Update sync metrics.
runutil.RunEvery(r.ctx, time.Second*10, r.updateMetrics)
}
// Stop the regular sync service.
func (r *Service) Stop() error {
defer r.cancel()
return nil
}
// Status of the currently running regular sync service.
func (r *Service) Status() error {
if r.chainStarted {
if r.initialSync.Syncing() {
return errors.New("waiting for initial sync")
}
// If our head slot is on a previous epoch and our peers are reporting their head block are
// in the most recent epoch, then we might be out of sync.
if headEpoch := helpers.SlotToEpoch(r.chain.HeadSlot()); headEpoch+1 < helpers.SlotToEpoch(r.chain.CurrentSlot()) &&
headEpoch+1 < r.p2p.Peers().CurrentEpoch() {
return errors.New("out of sync")
}
}
return nil
}
// This initializes the caches to update seen beacon objects coming in from the wire
// and prevent DoS.
func (r *Service) initCaches() error {
blkCache, err := lru.New(seenBlockSize)
if err != nil {
return err
}
attCache, err := lru.New(seenAttSize)
if err != nil {
return err
}
exitCache, err := lru.New(seenExitSize)
if err != nil {
return err
}
attesterSlashingCache, err := lru.New(seenAttesterSlashingSize)
if err != nil {
return err
}
proposerSlashingCache, err := lru.New(seenProposerSlashingSize)
if err != nil {
return err
}
r.seenBlockCache = blkCache
r.seenAttestationCache = attCache
r.seenExitCache = exitCache
r.seenAttesterSlashingCache = attesterSlashingCache
r.seenProposerSlashingCache = proposerSlashingCache
return nil
}
// Checker defines a struct which can verify whether a node is currently
// synchronizing a chain with the rest of peers in the network.
type Checker interface {
Syncing() bool
Status() error
Resync() error
}