mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-29 23:33:37 +00:00
e621f746a7
Fixes #2320.
705 lines
20 KiB
Go
705 lines
20 KiB
Go
package consensus
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import (
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"errors"
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"fmt"
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"sort"
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"time"
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"github.com/nspcc-dev/dbft"
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"github.com/nspcc-dev/dbft/block"
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"github.com/nspcc-dev/dbft/crypto"
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"github.com/nspcc-dev/dbft/payload"
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"github.com/nspcc-dev/neo-go/pkg/config"
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"github.com/nspcc-dev/neo-go/pkg/config/netmode"
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coreb "github.com/nspcc-dev/neo-go/pkg/core/block"
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"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/mempool"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/encoding/address"
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"github.com/nspcc-dev/neo-go/pkg/io"
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npayload "github.com/nspcc-dev/neo-go/pkg/network/payload"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/wallet"
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"go.uber.org/atomic"
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"go.uber.org/zap"
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)
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// cacheMaxCapacity is the default cache capacity taken
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// from C# implementation https://github.com/neo-project/neo/blob/master/neo/Ledger/Blockchain.cs#L64
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const cacheMaxCapacity = 100
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// defaultTimePerBlock is a period between blocks which is used in NEO.
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const defaultTimePerBlock = 15 * time.Second
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// Number of nanoseconds in millisecond.
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const nsInMs = 1000000
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// Category is message category for extensible payloads.
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const Category = "dBFT"
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// Ledger is the interface to Blockchain sufficient for Service.
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type Ledger interface {
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AddBlock(block *coreb.Block) error
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ApplyPolicyToTxSet([]*transaction.Transaction) []*transaction.Transaction
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GetConfig() config.ProtocolConfiguration
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GetMemPool() *mempool.Pool
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GetNextBlockValidators() ([]*keys.PublicKey, error)
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GetStateModule() blockchainer.StateRoot
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GetTransaction(util.Uint256) (*transaction.Transaction, uint32, error)
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GetValidators() ([]*keys.PublicKey, error)
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PoolTx(t *transaction.Transaction, pools ...*mempool.Pool) error
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SubscribeForBlocks(ch chan<- *coreb.Block)
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UnsubscribeFromBlocks(ch chan<- *coreb.Block)
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interop.Ledger
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mempool.Feer
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}
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// Service represents consensus instance.
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type Service interface {
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// Start initializes dBFT and starts event loop for consensus service.
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// It must be called only when sufficient amount of peers are connected.
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Start()
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// Shutdown stops dBFT event loop.
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Shutdown()
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// OnPayload is a callback to notify Service about new received payload.
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OnPayload(p *npayload.Extensible) error
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// OnTransaction is a callback to notify Service about new received transaction.
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OnTransaction(tx *transaction.Transaction)
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}
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type service struct {
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Config
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log *zap.Logger
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// txx is a fifo cache which stores miner transactions.
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txx *relayCache
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dbft *dbft.DBFT
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// messages and transactions are channels needed to process
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// everything in single thread.
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messages chan Payload
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transactions chan *transaction.Transaction
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// blockEvents is used to pass a new block event to the consensus
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// process.
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blockEvents chan *coreb.Block
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lastProposal []util.Uint256
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wallet *wallet.Wallet
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// started is a flag set with Start method that runs an event handling
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// goroutine.
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started *atomic.Bool
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quit chan struct{}
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finished chan struct{}
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// lastTimestamp contains timestamp for the last processed block.
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// We can't rely on timestamp from dbft context because it is changed
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// before block is accepted, so in case of change view it will contain
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// updated value.
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lastTimestamp uint64
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}
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// Config is a configuration for consensus services.
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type Config struct {
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// Logger is a logger instance.
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Logger *zap.Logger
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// Broadcast is a callback which is called to notify server
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// about new consensus payload to sent.
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Broadcast func(p *npayload.Extensible)
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// Chain is a Ledger instance.
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Chain Ledger
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// ProtocolConfiguration contains protocol settings.
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ProtocolConfiguration config.ProtocolConfiguration
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// RequestTx is a callback to which will be called
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// when a node lacks transactions present in a block.
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RequestTx func(h ...util.Uint256)
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// TimePerBlock minimal time that should pass before next block is accepted.
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TimePerBlock time.Duration
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// Wallet is a local-node wallet configuration.
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Wallet *config.Wallet
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}
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// NewService returns new consensus.Service instance.
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func NewService(cfg Config) (Service, error) {
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if cfg.TimePerBlock <= 0 {
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cfg.TimePerBlock = defaultTimePerBlock
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}
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if cfg.Logger == nil {
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return nil, errors.New("empty logger")
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}
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srv := &service{
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Config: cfg,
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log: cfg.Logger,
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txx: newFIFOCache(cacheMaxCapacity),
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messages: make(chan Payload, 100),
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transactions: make(chan *transaction.Transaction, 100),
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blockEvents: make(chan *coreb.Block, 1),
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started: atomic.NewBool(false),
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quit: make(chan struct{}),
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finished: make(chan struct{}),
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}
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var err error
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if srv.wallet, err = wallet.NewWalletFromFile(cfg.Wallet.Path); err != nil {
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return nil, err
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}
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// Check that wallet password is correct for at least one account.
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var ok bool
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for _, acc := range srv.wallet.Accounts {
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err := acc.Decrypt(srv.Config.Wallet.Password, srv.wallet.Scrypt)
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if err == nil {
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ok = true
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break
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}
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}
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if !ok {
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return nil, errors.New("no account with provided password was found")
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}
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defer srv.wallet.Close()
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srv.dbft = dbft.New(
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dbft.WithLogger(srv.log),
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dbft.WithSecondsPerBlock(cfg.TimePerBlock),
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dbft.WithGetKeyPair(srv.getKeyPair),
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dbft.WithRequestTx(cfg.RequestTx),
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dbft.WithGetTx(srv.getTx),
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dbft.WithGetVerified(srv.getVerifiedTx),
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dbft.WithBroadcast(srv.broadcast),
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dbft.WithProcessBlock(srv.processBlock),
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dbft.WithVerifyBlock(srv.verifyBlock),
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dbft.WithGetBlock(srv.getBlock),
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dbft.WithWatchOnly(func() bool { return false }),
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dbft.WithNewBlockFromContext(srv.newBlockFromContext),
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dbft.WithCurrentHeight(cfg.Chain.BlockHeight),
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dbft.WithCurrentBlockHash(cfg.Chain.CurrentBlockHash),
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dbft.WithGetValidators(srv.getValidators),
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dbft.WithGetConsensusAddress(srv.getConsensusAddress),
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dbft.WithNewConsensusPayload(srv.newPayload),
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dbft.WithNewPrepareRequest(srv.newPrepareRequest),
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dbft.WithNewPrepareResponse(func() payload.PrepareResponse { return new(prepareResponse) }),
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dbft.WithNewChangeView(func() payload.ChangeView { return new(changeView) }),
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dbft.WithNewCommit(func() payload.Commit { return new(commit) }),
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dbft.WithNewRecoveryRequest(func() payload.RecoveryRequest { return new(recoveryRequest) }),
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dbft.WithNewRecoveryMessage(func() payload.RecoveryMessage {
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return &recoveryMessage{stateRootEnabled: srv.ProtocolConfiguration.StateRootInHeader}
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}),
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dbft.WithVerifyPrepareRequest(srv.verifyRequest),
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dbft.WithVerifyPrepareResponse(func(_ payload.ConsensusPayload) error { return nil }),
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)
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if srv.dbft == nil {
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return nil, errors.New("can't initialize dBFT")
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}
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return srv, nil
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}
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var (
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_ block.Transaction = (*transaction.Transaction)(nil)
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_ block.Block = (*neoBlock)(nil)
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)
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// NewPayload creates new consensus payload for the provided network.
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func NewPayload(m netmode.Magic, stateRootEnabled bool) *Payload {
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return &Payload{
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Extensible: npayload.Extensible{
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Category: Category,
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},
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message: message{
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stateRootEnabled: stateRootEnabled,
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},
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network: m,
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}
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}
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func (s *service) newPayload(c *dbft.Context, t payload.MessageType, msg interface{}) payload.ConsensusPayload {
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cp := NewPayload(s.ProtocolConfiguration.Magic, s.ProtocolConfiguration.StateRootInHeader)
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cp.SetHeight(c.BlockIndex)
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cp.SetValidatorIndex(uint16(c.MyIndex))
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cp.SetViewNumber(c.ViewNumber)
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cp.SetType(t)
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if pr, ok := msg.(*prepareRequest); ok {
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pr.SetPrevHash(s.dbft.PrevHash)
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pr.SetVersion(s.dbft.Version)
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}
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cp.SetPayload(msg)
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cp.Extensible.ValidBlockStart = 0
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cp.Extensible.ValidBlockEnd = c.BlockIndex
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cp.Extensible.Sender = c.Validators[c.MyIndex].(*publicKey).GetScriptHash()
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return cp
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}
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func (s *service) newPrepareRequest() payload.PrepareRequest {
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r := new(prepareRequest)
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if s.ProtocolConfiguration.StateRootInHeader {
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r.stateRootEnabled = true
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if sr, err := s.Chain.GetStateModule().GetStateRoot(s.dbft.BlockIndex - 1); err == nil {
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r.stateRoot = sr.Root
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} else {
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panic(err)
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}
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}
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return r
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}
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func (s *service) Start() {
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if s.started.CAS(false, true) {
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s.log.Info("starting consensus service")
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s.dbft.Start()
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s.Chain.SubscribeForBlocks(s.blockEvents)
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go s.eventLoop()
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}
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}
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// Shutdown implements Service interface.
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func (s *service) Shutdown() {
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if s.started.Load() {
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close(s.quit)
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<-s.finished
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}
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}
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func (s *service) eventLoop() {
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events:
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for {
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select {
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case <-s.quit:
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s.dbft.Timer.Stop()
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break events
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case <-s.dbft.Timer.C():
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hv := s.dbft.Timer.HV()
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s.log.Debug("timer fired",
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zap.Uint32("height", hv.Height),
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zap.Uint("view", uint(hv.View)))
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s.dbft.OnTimeout(hv)
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case msg := <-s.messages:
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fields := []zap.Field{
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zap.Uint8("from", msg.message.ValidatorIndex),
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zap.Stringer("type", msg.Type()),
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}
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if msg.Type() == payload.RecoveryMessageType {
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rec := msg.GetRecoveryMessage().(*recoveryMessage)
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if rec.preparationHash == nil {
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req := rec.GetPrepareRequest(&msg, s.dbft.Validators, uint16(s.dbft.PrimaryIndex))
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if req != nil {
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h := req.Hash()
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rec.preparationHash = &h
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}
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}
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fields = append(fields,
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zap.Int("#preparation", len(rec.preparationPayloads)),
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zap.Int("#commit", len(rec.commitPayloads)),
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zap.Int("#changeview", len(rec.changeViewPayloads)),
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zap.Bool("#request", rec.prepareRequest != nil),
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zap.Bool("#hash", rec.preparationHash != nil))
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}
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s.log.Debug("received message", fields...)
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s.dbft.OnReceive(&msg)
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case tx := <-s.transactions:
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s.dbft.OnTransaction(tx)
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case b := <-s.blockEvents:
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s.handleChainBlock(b)
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}
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// Always process block event if there is any, we can add one above.
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select {
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case b := <-s.blockEvents:
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s.handleChainBlock(b)
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default:
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}
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}
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close(s.finished)
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}
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func (s *service) handleChainBlock(b *coreb.Block) {
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// We can get our own block here, so check for index.
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if b.Index >= s.dbft.BlockIndex {
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s.log.Debug("new block in the chain",
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zap.Uint32("dbft index", s.dbft.BlockIndex),
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zap.Uint32("chain index", s.Chain.BlockHeight()))
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s.postBlock(b)
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s.dbft.InitializeConsensus(0)
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}
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}
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func (s *service) validatePayload(p *Payload) bool {
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validators := s.getValidators()
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if int(p.message.ValidatorIndex) >= len(validators) {
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return false
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}
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pub := validators[p.message.ValidatorIndex]
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h := pub.(*publicKey).GetScriptHash()
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return p.Sender == h
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}
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func (s *service) getKeyPair(pubs []crypto.PublicKey) (int, crypto.PrivateKey, crypto.PublicKey) {
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for i := range pubs {
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sh := pubs[i].(*publicKey).GetScriptHash()
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acc := s.wallet.GetAccount(sh)
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if acc == nil {
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continue
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}
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key := acc.PrivateKey()
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if acc.PrivateKey() == nil {
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err := acc.Decrypt(s.Config.Wallet.Password, s.wallet.Scrypt)
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if err != nil {
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s.log.Fatal("can't unlock account", zap.String("address", address.Uint160ToString(sh)))
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break
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}
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key = acc.PrivateKey()
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}
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return i, &privateKey{PrivateKey: key}, &publicKey{PublicKey: key.PublicKey()}
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}
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return -1, nil, nil
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}
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func (s *service) payloadFromExtensible(ep *npayload.Extensible) *Payload {
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return &Payload{
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Extensible: *ep,
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message: message{
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stateRootEnabled: s.ProtocolConfiguration.StateRootInHeader,
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},
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}
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}
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// OnPayload handles Payload receive.
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func (s *service) OnPayload(cp *npayload.Extensible) error {
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log := s.log.With(zap.Stringer("hash", cp.Hash()))
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p := s.payloadFromExtensible(cp)
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// decode payload data into message
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if err := p.decodeData(); err != nil {
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log.Info("can't decode payload data", zap.Error(err))
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return nil
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}
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if !s.validatePayload(p) {
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log.Info("can't validate payload")
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return nil
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}
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if s.dbft == nil || !s.started.Load() {
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log.Debug("dbft is inactive or not started yet")
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return nil
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}
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s.messages <- *p
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return nil
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}
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func (s *service) OnTransaction(tx *transaction.Transaction) {
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if s.dbft != nil {
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s.transactions <- tx
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}
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}
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func (s *service) broadcast(p payload.ConsensusPayload) {
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if err := p.(*Payload).Sign(s.dbft.Priv.(*privateKey)); err != nil {
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s.log.Warn("can't sign consensus payload", zap.Error(err))
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}
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ep := &p.(*Payload).Extensible
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s.Config.Broadcast(ep)
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}
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func (s *service) getTx(h util.Uint256) block.Transaction {
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if tx := s.txx.Get(h); tx != nil {
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return tx.(*transaction.Transaction)
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}
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tx, _, _ := s.Config.Chain.GetTransaction(h)
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// this is needed because in case of absent tx dBFT expects to
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// get nil interface, not a nil pointer to any concrete type
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if tx != nil {
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return tx
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}
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return nil
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}
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func (s *service) verifyBlock(b block.Block) bool {
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coreb := &b.(*neoBlock).Block
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if s.Chain.BlockHeight() >= coreb.Index {
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s.log.Warn("proposed block has already outdated")
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return false
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}
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if s.lastTimestamp >= coreb.Timestamp {
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s.log.Warn("proposed block has small timestamp",
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zap.Uint64("ts", coreb.Timestamp),
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zap.Uint64("last", s.lastTimestamp))
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return false
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}
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size := coreb.GetExpectedBlockSize()
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if size > int(s.ProtocolConfiguration.MaxBlockSize) {
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s.log.Warn("proposed block size exceeds config MaxBlockSize",
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zap.Uint32("max size allowed", s.ProtocolConfiguration.MaxBlockSize),
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zap.Int("block size", size))
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return false
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}
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var fee int64
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var pool = mempool.New(len(coreb.Transactions), 0, false)
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var mainPool = s.Chain.GetMemPool()
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for _, tx := range coreb.Transactions {
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var err error
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fee += tx.SystemFee
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if mainPool.ContainsKey(tx.Hash()) {
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err = pool.Add(tx, s.Chain)
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if err == nil {
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continue
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}
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} else {
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err = s.Chain.PoolTx(tx, pool)
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}
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if err != nil {
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s.log.Warn("invalid transaction in proposed block",
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zap.Stringer("hash", tx.Hash()),
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zap.Error(err))
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return false
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}
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if s.Chain.BlockHeight() >= coreb.Index {
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s.log.Warn("proposed block has already outdated")
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return false
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}
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}
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maxBlockSysFee := s.ProtocolConfiguration.MaxBlockSystemFee
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if fee > maxBlockSysFee {
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s.log.Warn("proposed block system fee exceeds config MaxBlockSystemFee",
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zap.Int("max system fee allowed", int(maxBlockSysFee)),
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zap.Int("block system fee", int(fee)))
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return false
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}
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return true
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}
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var (
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errInvalidPrevHash = errors.New("invalid PrevHash")
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errInvalidVersion = errors.New("invalid Version")
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errInvalidStateRoot = errors.New("state root mismatch")
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errInvalidTransactionsCount = errors.New("invalid transactions count")
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)
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func (s *service) verifyRequest(p payload.ConsensusPayload) error {
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req := p.GetPrepareRequest().(*prepareRequest)
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if req.prevHash != s.dbft.PrevHash {
|
|
return errInvalidPrevHash
|
|
}
|
|
if req.version != s.dbft.Version {
|
|
return errInvalidVersion
|
|
}
|
|
if s.ProtocolConfiguration.StateRootInHeader {
|
|
sr, err := s.Chain.GetStateModule().GetStateRoot(s.dbft.BlockIndex - 1)
|
|
if err != nil {
|
|
return err
|
|
} else if sr.Root != req.stateRoot {
|
|
return fmt.Errorf("%w: %s != %s", errInvalidStateRoot, sr.Root, req.stateRoot)
|
|
}
|
|
}
|
|
if len(req.TransactionHashes()) > int(s.ProtocolConfiguration.MaxTransactionsPerBlock) {
|
|
return fmt.Errorf("%w: max = %d, got %d", errInvalidTransactionsCount, s.ProtocolConfiguration.MaxTransactionsPerBlock, len(req.TransactionHashes()))
|
|
}
|
|
// Save lastProposal for getVerified().
|
|
s.lastProposal = req.transactionHashes
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *service) processBlock(b block.Block) {
|
|
bb := &b.(*neoBlock).Block
|
|
bb.Script = *(s.getBlockWitness(bb))
|
|
|
|
if err := s.Chain.AddBlock(bb); err != nil {
|
|
// The block might already be added via the regular network
|
|
// interaction.
|
|
if _, errget := s.Chain.GetBlock(bb.Hash()); errget != nil {
|
|
s.log.Warn("error on add block", zap.Error(err))
|
|
}
|
|
}
|
|
s.postBlock(bb)
|
|
}
|
|
|
|
func (s *service) postBlock(b *coreb.Block) {
|
|
if s.lastTimestamp < b.Timestamp {
|
|
s.lastTimestamp = b.Timestamp
|
|
}
|
|
s.lastProposal = nil
|
|
}
|
|
|
|
func (s *service) getBlockWitness(b *coreb.Block) *transaction.Witness {
|
|
dctx := s.dbft.Context
|
|
pubs := convertKeys(dctx.Validators)
|
|
sigs := make(map[*keys.PublicKey][]byte)
|
|
|
|
for i := range pubs {
|
|
if p := dctx.CommitPayloads[i]; p != nil && p.ViewNumber() == dctx.ViewNumber {
|
|
sigs[pubs[i]] = p.GetCommit().Signature()
|
|
}
|
|
}
|
|
|
|
m := s.dbft.Context.M()
|
|
verif, err := smartcontract.CreateMultiSigRedeemScript(m, pubs)
|
|
if err != nil {
|
|
s.log.Warn("can't create multisig redeem script", zap.Error(err))
|
|
return nil
|
|
}
|
|
|
|
sort.Sort(keys.PublicKeys(pubs))
|
|
|
|
buf := io.NewBufBinWriter()
|
|
for i, j := 0, 0; i < len(pubs) && j < m; i++ {
|
|
if sig, ok := sigs[pubs[i]]; ok {
|
|
emit.Bytes(buf.BinWriter, sig)
|
|
j++
|
|
}
|
|
}
|
|
|
|
return &transaction.Witness{
|
|
InvocationScript: buf.Bytes(),
|
|
VerificationScript: verif,
|
|
}
|
|
}
|
|
|
|
func (s *service) getBlock(h util.Uint256) block.Block {
|
|
b, err := s.Chain.GetBlock(h)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
|
|
return &neoBlock{network: s.ProtocolConfiguration.Magic, Block: *b}
|
|
}
|
|
|
|
func (s *service) getVerifiedTx() []block.Transaction {
|
|
pool := s.Config.Chain.GetMemPool()
|
|
|
|
var txx []*transaction.Transaction
|
|
|
|
if s.dbft.ViewNumber > 0 && len(s.lastProposal) > 0 {
|
|
txx = make([]*transaction.Transaction, 0, len(s.lastProposal))
|
|
for i := range s.lastProposal {
|
|
if tx, ok := pool.TryGetValue(s.lastProposal[i]); ok {
|
|
txx = append(txx, tx)
|
|
}
|
|
}
|
|
|
|
if len(txx) < len(s.lastProposal)/2 {
|
|
txx = pool.GetVerifiedTransactions()
|
|
}
|
|
} else {
|
|
txx = pool.GetVerifiedTransactions()
|
|
}
|
|
|
|
if len(txx) > 0 {
|
|
txx = s.Config.Chain.ApplyPolicyToTxSet(txx)
|
|
}
|
|
|
|
res := make([]block.Transaction, len(txx))
|
|
for i := range txx {
|
|
res[i] = txx[i]
|
|
}
|
|
|
|
return res
|
|
}
|
|
|
|
func (s *service) getValidators(txes ...block.Transaction) []crypto.PublicKey {
|
|
var (
|
|
pKeys []*keys.PublicKey
|
|
err error
|
|
)
|
|
if txes == nil {
|
|
pKeys, err = s.Chain.GetNextBlockValidators()
|
|
} else {
|
|
pKeys, err = s.Chain.GetValidators()
|
|
}
|
|
if err != nil {
|
|
s.log.Error("error while trying to get validators", zap.Error(err))
|
|
}
|
|
|
|
pubs := make([]crypto.PublicKey, len(pKeys))
|
|
for i := range pKeys {
|
|
pubs[i] = &publicKey{PublicKey: pKeys[i]}
|
|
}
|
|
|
|
return pubs
|
|
}
|
|
|
|
func (s *service) getConsensusAddress(validators ...crypto.PublicKey) util.Uint160 {
|
|
return util.Uint160{}
|
|
}
|
|
|
|
func convertKeys(validators []crypto.PublicKey) (pubs []*keys.PublicKey) {
|
|
pubs = make([]*keys.PublicKey, len(validators))
|
|
for i, k := range validators {
|
|
pubs[i] = k.(*publicKey).PublicKey
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func (s *service) newBlockFromContext(ctx *dbft.Context) block.Block {
|
|
block := &neoBlock{network: s.ProtocolConfiguration.Magic}
|
|
|
|
block.Block.Timestamp = ctx.Timestamp / nsInMs
|
|
block.Block.Nonce = ctx.Nonce
|
|
block.Block.Index = ctx.BlockIndex
|
|
if s.ProtocolConfiguration.StateRootInHeader {
|
|
sr, err := s.Chain.GetStateModule().GetStateRoot(ctx.BlockIndex - 1)
|
|
if err != nil {
|
|
s.log.Fatal(fmt.Sprintf("failed to get state root: %s", err.Error()))
|
|
}
|
|
block.StateRootEnabled = true
|
|
block.PrevStateRoot = sr.Root
|
|
}
|
|
|
|
var validators keys.PublicKeys
|
|
var err error
|
|
cfg := s.Chain.GetConfig()
|
|
if cfg.ShouldUpdateCommitteeAt(ctx.BlockIndex) {
|
|
validators, err = s.Chain.GetValidators()
|
|
} else {
|
|
validators, err = s.Chain.GetNextBlockValidators()
|
|
}
|
|
if err != nil {
|
|
s.log.Fatal(fmt.Sprintf("failed to get validators: %s", err.Error()))
|
|
}
|
|
script, err := smartcontract.CreateDefaultMultiSigRedeemScript(validators)
|
|
if err != nil {
|
|
s.log.Fatal(fmt.Sprintf("failed to create multisignature script: %s", err.Error()))
|
|
}
|
|
block.Block.NextConsensus = crypto.Hash160(script)
|
|
block.Block.PrevHash = ctx.PrevHash
|
|
block.Block.Version = ctx.Version
|
|
|
|
primaryIndex := byte(ctx.PrimaryIndex)
|
|
block.Block.PrimaryIndex = primaryIndex
|
|
|
|
// it's OK to have ctx.TransactionsHashes == nil here
|
|
hashes := make([]util.Uint256, len(ctx.TransactionHashes))
|
|
copy(hashes, ctx.TransactionHashes)
|
|
block.Block.MerkleRoot = hash.CalcMerkleRoot(hashes)
|
|
|
|
return block
|
|
}
|