mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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296 lines
10 KiB
Go
296 lines
10 KiB
Go
// Package blockchain defines the life-cycle and status of the beacon chain
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// as well as the Ethereum Serenity beacon chain fork-choice rule based on
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// Casper Proof of Stake finality.
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package blockchain
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import (
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"bytes"
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"context"
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"encoding/hex"
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"fmt"
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"runtime"
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"sync"
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"time"
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"github.com/pkg/errors"
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"github.com/prysmaticlabs/go-ssz"
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"github.com/prysmaticlabs/prysm/beacon-chain/blockchain/forkchoice"
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"github.com/prysmaticlabs/prysm/beacon-chain/cache/depositcache"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/validators"
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"github.com/prysmaticlabs/prysm/beacon-chain/db"
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"github.com/prysmaticlabs/prysm/beacon-chain/operations"
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"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
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"github.com/prysmaticlabs/prysm/beacon-chain/powchain"
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pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
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ethpb "github.com/prysmaticlabs/prysm/proto/eth/v1alpha1"
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"github.com/prysmaticlabs/prysm/shared/bytesutil"
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"github.com/prysmaticlabs/prysm/shared/event"
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"github.com/sirupsen/logrus"
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"go.opencensus.io/trace"
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)
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// ChainFeeds interface defines the methods of the ChainService which provide
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// information feeds.
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type ChainFeeds interface {
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StateInitializedFeed() *event.Feed
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}
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// ChainService represents a service that handles the internal
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// logic of managing the full PoS beacon chain.
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type ChainService struct {
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ctx context.Context
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cancel context.CancelFunc
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beaconDB db.Database
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depositCache *depositcache.DepositCache
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web3Service *powchain.Web3Service
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opsPoolService operations.OperationFeeds
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forkChoiceStore forkchoice.ForkChoicer
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chainStartChan chan time.Time
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genesisTime time.Time
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stateInitializedFeed *event.Feed
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p2p p2p.Broadcaster
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maxRoutines int64
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headSlot uint64
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headBlock *ethpb.BeaconBlock
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headState *pb.BeaconState
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canonicalRoots map[uint64][]byte
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canonicalRootsLock sync.RWMutex
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}
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// Config options for the service.
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type Config struct {
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BeaconBlockBuf int
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Web3Service *powchain.Web3Service
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BeaconDB db.Database
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DepositCache *depositcache.DepositCache
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OpsPoolService operations.OperationFeeds
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P2p p2p.Broadcaster
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MaxRoutines int64
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}
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// NewChainService instantiates a new service instance that will
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// be registered into a running beacon node.
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func NewChainService(ctx context.Context, cfg *Config) (*ChainService, error) {
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ctx, cancel := context.WithCancel(ctx)
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store := forkchoice.NewForkChoiceService(ctx, cfg.BeaconDB)
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return &ChainService{
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ctx: ctx,
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cancel: cancel,
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beaconDB: cfg.BeaconDB,
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depositCache: cfg.DepositCache,
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web3Service: cfg.Web3Service,
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opsPoolService: cfg.OpsPoolService,
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forkChoiceStore: store,
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chainStartChan: make(chan time.Time),
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stateInitializedFeed: new(event.Feed),
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p2p: cfg.P2p,
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canonicalRoots: make(map[uint64][]byte),
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maxRoutines: cfg.MaxRoutines,
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}, nil
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}
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// Start a blockchain service's main event loop.
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func (c *ChainService) Start() {
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beaconState, err := c.beaconDB.HeadState(c.ctx)
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if err != nil {
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log.Fatalf("Could not fetch beacon state: %v", err)
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}
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// If the chain has already been initialized, simply start the block processing routine.
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if beaconState != nil {
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log.Info("Beacon chain data already exists, starting service")
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c.genesisTime = time.Unix(int64(beaconState.GenesisTime), 0)
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} else {
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log.Info("Waiting for ChainStart log from the Validator Deposit Contract to start the beacon chain...")
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if c.web3Service == nil {
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log.Fatal("Not configured web3Service for POW chain")
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return // return need for TestStartUninitializedChainWithoutConfigPOWChain.
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}
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subChainStart := c.web3Service.ChainStartFeed().Subscribe(c.chainStartChan)
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go func() {
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genesisTime := <-c.chainStartChan
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c.processChainStartTime(c.ctx, genesisTime, subChainStart)
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return
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}()
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}
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}
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// processChainStartTime initializes a series of deposits from the ChainStart deposits in the eth1
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// deposit contract, initializes the beacon chain's state, and kicks off the beacon chain.
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func (c *ChainService) processChainStartTime(ctx context.Context, genesisTime time.Time, chainStartSub event.Subscription) {
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initialDeposits := c.web3Service.ChainStartDeposits()
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if err := c.initializeBeaconChain(ctx, genesisTime, initialDeposits, c.web3Service.ChainStartETH1Data()); err != nil {
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log.Fatalf("Could not initialize beacon chain: %v", err)
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}
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c.stateInitializedFeed.Send(genesisTime)
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chainStartSub.Unsubscribe()
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}
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// initializes the state and genesis block of the beacon chain to persistent storage
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// based on a genesis timestamp value obtained from the ChainStart event emitted
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// by the ETH1.0 Deposit Contract and the POWChain service of the node.
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func (c *ChainService) initializeBeaconChain(
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ctx context.Context,
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genesisTime time.Time,
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deposits []*ethpb.Deposit,
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eth1data *ethpb.Eth1Data) error {
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_, span := trace.StartSpan(context.Background(), "beacon-chain.ChainService.initializeBeaconChain")
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defer span.End()
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log.Info("ChainStart time reached, starting the beacon chain!")
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c.genesisTime = genesisTime
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unixTime := uint64(genesisTime.Unix())
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genesisState, err := state.GenesisBeaconState(deposits, unixTime, eth1data)
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if err != nil {
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return errors.Wrap(err, "could not initialize genesis state")
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}
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stateRoot, err := ssz.HashTreeRoot(genesisState)
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if err != nil {
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return errors.Wrap(err, "could not tree hash genesis state")
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}
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genesisBlk := blocks.NewGenesisBlock(stateRoot[:])
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if err := c.saveGenesisValidators(ctx, genesisState); err != nil {
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return errors.Wrap(err, "could not save genesis validators")
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}
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if err := c.forkChoiceStore.GenesisStore(ctx, genesisState); err != nil {
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return errors.Wrap(err, "could not start genesis store for fork choice")
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}
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c.headBlock = genesisBlk
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c.headState = genesisState
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c.canonicalRoots[genesisState.Slot] = c.FinalizedCheckpt().Root
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c.canonicalRoots[genesisState.Slot] = c.FinalizedCheckpt().Root
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return nil
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}
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// Stop the blockchain service's main event loop and associated goroutines.
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func (c *ChainService) Stop() error {
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defer c.cancel()
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log.Info("Stopping service")
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return nil
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}
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// Status always returns nil.
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// TODO(1202): Add service health checks.
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func (c *ChainService) Status() error {
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if runtime.NumGoroutine() > int(c.maxRoutines) {
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return fmt.Errorf("too many goroutines %d", runtime.NumGoroutine())
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}
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return nil
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}
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// StateInitializedFeed returns a feed that is written to
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// when the beacon state is first initialized.
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func (c *ChainService) StateInitializedFeed() *event.Feed {
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return c.stateInitializedFeed
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}
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// saveValidatorIdx saves the validators public key to index mapping in DB, these
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// validators were activated from current epoch. After it saves, current epoch key
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// is deleted from ActivatedValidators mapping.
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func (c *ChainService) saveValidatorIdx(ctx context.Context, state *pb.BeaconState) error {
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nextEpoch := helpers.CurrentEpoch(state) + 1
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activatedValidators := validators.ActivatedValFromEpoch(nextEpoch)
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var idxNotInState []uint64
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for _, idx := range activatedValidators {
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// If for some reason the activated validator indices is not in state,
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// we skip them and save them to process for next epoch.
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if int(idx) >= len(state.Validators) {
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idxNotInState = append(idxNotInState, idx)
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continue
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}
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pubKey := state.Validators[idx].PublicKey
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if err := c.beaconDB.SaveValidatorIndex(ctx, bytesutil.ToBytes48(pubKey), idx); err != nil {
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return errors.Wrap(err, "could not save validator index")
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}
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}
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// Since we are processing next epoch, save the can't processed validator indices
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// to the epoch after that.
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validators.InsertActivatedIndices(nextEpoch+1, idxNotInState)
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validators.DeleteActivatedVal(helpers.CurrentEpoch(state))
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return nil
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}
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// deleteValidatorIdx deletes the validators public key to index mapping in DB, the
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// validators were exited from current epoch. After it deletes, current epoch key
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// is deleted from ExitedValidators mapping.
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func (c *ChainService) deleteValidatorIdx(ctx context.Context, state *pb.BeaconState) error {
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exitedValidators := validators.ExitedValFromEpoch(helpers.CurrentEpoch(state) + 1)
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for _, idx := range exitedValidators {
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pubKey := state.Validators[idx].PublicKey
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if err := c.beaconDB.DeleteValidatorIndex(ctx, bytesutil.ToBytes48(pubKey)); err != nil {
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return errors.Wrap(err, "could not delete validator index")
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}
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}
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validators.DeleteExitedVal(helpers.CurrentEpoch(state))
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return nil
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}
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// This gets called to update canonical root mapping.
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func (c *ChainService) saveHead(ctx context.Context, b *ethpb.BeaconBlock, r [32]byte) error {
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c.headSlot = b.Slot
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c.canonicalRootsLock.Lock()
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c.canonicalRoots[b.Slot] = r[:]
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defer c.canonicalRootsLock.Unlock()
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if err := c.beaconDB.SaveHeadBlockRoot(ctx, r); err != nil {
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return errors.Wrap(err, "could not save head root in DB")
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}
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c.headBlock = b
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s, err := c.beaconDB.State(ctx, r)
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if err != nil {
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return errors.Wrap(err, "could not retrieve head state in DB")
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}
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c.headState = s
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log.WithFields(logrus.Fields{
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"slots": b.Slot,
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"root": hex.EncodeToString(r[:]),
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}).Debug("Saved head info")
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return nil
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}
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// This gets called when beacon chain is first initialized to save validator indices and pubkeys in db
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func (c *ChainService) saveGenesisValidators(ctx context.Context, s *pb.BeaconState) error {
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for i, v := range s.Validators {
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if err := c.beaconDB.SaveValidatorIndex(ctx, bytesutil.ToBytes48(v.PublicKey), uint64(i)); err != nil {
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return errors.Wrapf(err, "could not save validator index: %d", i)
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}
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}
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return nil
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}
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// This checks if the block is from a competing chain, emits warning and updates metrics.
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func isCompetingBlock(root []byte, slot uint64, headRoot []byte, headSlot uint64) {
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if !bytes.Equal(root[:], headRoot) {
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log.WithFields(logrus.Fields{
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"blkSlot": slot,
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"blkRoot": hex.EncodeToString(root[:]),
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"headSlot": headSlot,
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"headRoot": hex.EncodeToString(headRoot),
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}).Warn("Calculated head diffs from new block")
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competingBlks.Inc()
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}
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}
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// This checks if the attestation is from a competing chain, emits warning and updates metrics.
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func isCompetingAtts(root []byte, headRoot []byte) {
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if !bytes.Equal(root[:], headRoot) {
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log.WithFields(logrus.Fields{
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"attDataRoot": hex.EncodeToString(root[:]),
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"headRoot": hex.EncodeToString(headRoot),
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}).Warn("Calculated head diffs from new attestation")
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competingAtts.Inc()
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}
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}
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