791c983304
It no longer depends on blockchain state and there can't ever be an error, in fact we can always iterate over signers, so copying these hashes doesn't make much sense at all as well as sorting arrays in verifyTxWitnesses (witnesses order must match signers order).
1547 lines
47 KiB
Go
1547 lines
47 KiB
Go
package core
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|
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import (
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"errors"
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"fmt"
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"math/big"
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"sort"
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"sync"
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"sync/atomic"
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"time"
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"github.com/nspcc-dev/neo-go/pkg/config"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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"github.com/nspcc-dev/neo-go/pkg/core/dao"
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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/native"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/storage"
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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/bigint"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"go.uber.org/zap"
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)
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// Tuning parameters.
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const (
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headerBatchCount = 2000
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version = "0.1.0"
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defaultMemPoolSize = 50000
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verificationGasLimit = 100000000 // 1 GAS
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)
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var (
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// ErrAlreadyExists is returned when trying to add some already existing
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// transaction into the pool (not specifying whether it exists in the
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// chain or mempool).
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ErrAlreadyExists = errors.New("already exists")
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// ErrOOM is returned when adding transaction to the memory pool because
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// it reached its full capacity.
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ErrOOM = errors.New("no space left in the memory pool")
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// ErrPolicy is returned on attempt to add transaction that doesn't
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// comply with node's configured policy into the mempool.
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ErrPolicy = errors.New("not allowed by policy")
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// ErrInvalidBlockIndex is returned when trying to add block with index
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// other than expected height of the blockchain.
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ErrInvalidBlockIndex error = errors.New("invalid block index")
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)
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var (
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genAmount = []int{6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
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decrementInterval = 2000000
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persistInterval = 1 * time.Second
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)
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// Blockchain represents the blockchain. It maintans internal state representing
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// the state of the ledger that can be accessed in various ways and changed by
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// adding new blocks or headers.
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type Blockchain struct {
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config config.ProtocolConfiguration
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// The only way chain state changes is by adding blocks, so we can't
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// allow concurrent block additions. It differs from the next lock in
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// that it's only for AddBlock method itself, the chain state is
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// protected by the lock below, but holding it during all of AddBlock
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// is too expensive (because the state only changes when persisting
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// change cache).
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addLock sync.Mutex
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// This lock ensures blockchain immutability for operations that need
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// that while performing their tasks. It's mostly used as a read lock
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// with the only writer being the block addition logic.
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lock sync.RWMutex
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// Data access object for CRUD operations around storage.
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dao *dao.Simple
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// Current index/height of the highest block.
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// Read access should always be called by BlockHeight().
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// Write access should only happen in storeBlock().
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blockHeight uint32
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// Current top Block wrapped in an atomic.Value for safe access.
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topBlock atomic.Value
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// Current persisted block count.
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persistedHeight uint32
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// Number of headers stored in the chain file.
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storedHeaderCount uint32
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generationAmount []int
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decrementInterval int
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// All operations on headerList must be called from an
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// headersOp to be routine safe.
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headerList *HeaderHashList
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// Only for operating on the headerList.
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headersOp chan headersOpFunc
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headersOpDone chan struct{}
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// Stop synchronization mechanisms.
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stopCh chan struct{}
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runToExitCh chan struct{}
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memPool mempool.Pool
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// This lock protects concurrent access to keyCache.
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keyCacheLock sync.RWMutex
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// cache for block verification keys.
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keyCache map[util.Uint160]map[string]*keys.PublicKey
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|
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sbValidators keys.PublicKeys
|
|
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log *zap.Logger
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lastBatch *storage.MemBatch
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contracts native.Contracts
|
|
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// Notification subsystem.
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events chan bcEvent
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subCh chan interface{}
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unsubCh chan interface{}
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}
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// bcEvent is an internal event generated by the Blockchain and then
|
|
// broadcasted to other parties. It joins the new block and associated
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// invocation logs, all the other events visible from outside can be produced
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// from this combination.
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type bcEvent struct {
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block *block.Block
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appExecResults []*state.AppExecResult
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}
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type headersOpFunc func(headerList *HeaderHashList)
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// NewBlockchain returns a new blockchain object the will use the
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// given Store as its underlying storage. For it to work correctly you need
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// to spawn a goroutine for its Run method after this initialization.
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func NewBlockchain(s storage.Store, cfg config.ProtocolConfiguration, log *zap.Logger) (*Blockchain, error) {
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if log == nil {
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return nil, errors.New("empty logger")
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}
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if cfg.MemPoolSize <= 0 {
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cfg.MemPoolSize = defaultMemPoolSize
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log.Info("mempool size is not set or wrong, setting default value", zap.Int("MemPoolSize", cfg.MemPoolSize))
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}
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validators, err := validatorsFromConfig(cfg)
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if err != nil {
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return nil, err
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}
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bc := &Blockchain{
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config: cfg,
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dao: dao.NewSimple(s, cfg.Magic),
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headersOp: make(chan headersOpFunc),
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headersOpDone: make(chan struct{}),
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stopCh: make(chan struct{}),
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runToExitCh: make(chan struct{}),
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memPool: mempool.NewMemPool(cfg.MemPoolSize),
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keyCache: make(map[util.Uint160]map[string]*keys.PublicKey),
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sbValidators: validators,
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log: log,
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events: make(chan bcEvent),
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subCh: make(chan interface{}),
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unsubCh: make(chan interface{}),
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generationAmount: genAmount,
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decrementInterval: decrementInterval,
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contracts: *native.NewContracts(),
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}
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if err := bc.init(); err != nil {
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return nil, err
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}
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return bc, nil
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}
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func (bc *Blockchain) init() error {
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// If we could not find the version in the Store, we know that there is nothing stored.
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ver, err := bc.dao.GetVersion()
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if err != nil {
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bc.log.Info("no storage version found! creating genesis block")
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if err = bc.dao.PutVersion(version); err != nil {
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return err
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}
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genesisBlock, err := createGenesisBlock(bc.config)
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if err != nil {
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return err
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}
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bc.headerList = NewHeaderHashList(genesisBlock.Hash())
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err = bc.dao.PutCurrentHeader(hashAndIndexToBytes(genesisBlock.Hash(), genesisBlock.Index))
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if err != nil {
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return err
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}
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return bc.storeBlock(genesisBlock)
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}
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if ver != version {
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return fmt.Errorf("storage version mismatch betweeen %s and %s", version, ver)
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|
}
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// At this point there was no version found in the storage which
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// implies a creating fresh storage with the version specified
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// and the genesis block as first block.
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bc.log.Info("restoring blockchain", zap.String("version", version))
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bHeight, err := bc.dao.GetCurrentBlockHeight()
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if err != nil {
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return err
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}
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bc.blockHeight = bHeight
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bc.persistedHeight = bHeight
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if err = bc.dao.InitMPT(bHeight); err != nil {
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return fmt.Errorf("can't init MPT at height %d: %w", bHeight, err)
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}
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hashes, err := bc.dao.GetHeaderHashes()
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if err != nil {
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return err
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}
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bc.headerList = NewHeaderHashList(hashes...)
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bc.storedHeaderCount = uint32(len(hashes))
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|
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currHeaderHeight, currHeaderHash, err := bc.dao.GetCurrentHeaderHeight()
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if err != nil {
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return err
|
|
}
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if bc.storedHeaderCount == 0 && currHeaderHeight == 0 {
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bc.headerList.Add(currHeaderHash)
|
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}
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|
|
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// There is a high chance that the Node is stopped before the next
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// batch of 2000 headers was stored. Via the currentHeaders stored we can sync
|
|
// that with stored blocks.
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if currHeaderHeight >= bc.storedHeaderCount {
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hash := currHeaderHash
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var targetHash util.Uint256
|
|
if bc.headerList.Len() > 0 {
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|
targetHash = bc.headerList.Get(bc.headerList.Len() - 1)
|
|
} else {
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genesisBlock, err := createGenesisBlock(bc.config)
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if err != nil {
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return err
|
|
}
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targetHash = genesisBlock.Hash()
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bc.headerList.Add(targetHash)
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}
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headers := make([]*block.Header, 0)
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|
|
|
for hash != targetHash {
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header, err := bc.GetHeader(hash)
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if err != nil {
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return fmt.Errorf("could not get header %s: %w", hash, err)
|
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}
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headers = append(headers, header)
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hash = header.PrevHash
|
|
}
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headerSliceReverse(headers)
|
|
for _, h := range headers {
|
|
if !h.Verify() {
|
|
return fmt.Errorf("bad header %d/%s in the storage", h.Index, h.Hash())
|
|
}
|
|
bc.headerList.Add(h.Hash())
|
|
}
|
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}
|
|
|
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return nil
|
|
}
|
|
|
|
// Run runs chain loop, it needs to be run as goroutine and executing it is
|
|
// critical for correct Blockchain operation.
|
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func (bc *Blockchain) Run() {
|
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persistTimer := time.NewTimer(persistInterval)
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|
defer func() {
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|
persistTimer.Stop()
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|
if err := bc.persist(); err != nil {
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bc.log.Warn("failed to persist", zap.Error(err))
|
|
}
|
|
if err := bc.dao.Store.Close(); err != nil {
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bc.log.Warn("failed to close db", zap.Error(err))
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}
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close(bc.runToExitCh)
|
|
}()
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go bc.notificationDispatcher()
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for {
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select {
|
|
case <-bc.stopCh:
|
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return
|
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case op := <-bc.headersOp:
|
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op(bc.headerList)
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bc.headersOpDone <- struct{}{}
|
|
case <-persistTimer.C:
|
|
go func() {
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err := bc.persist()
|
|
if err != nil {
|
|
bc.log.Warn("failed to persist blockchain", zap.Error(err))
|
|
}
|
|
persistTimer.Reset(persistInterval)
|
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}()
|
|
}
|
|
}
|
|
}
|
|
|
|
// notificationDispatcher manages subscription to events and broadcasts new events.
|
|
func (bc *Blockchain) notificationDispatcher() {
|
|
var (
|
|
// These are just sets of subscribers, though modelled as maps
|
|
// for ease of management (not a lot of subscriptions is really
|
|
// expected, but maps are convenient for adding/deleting elements).
|
|
blockFeed = make(map[chan<- *block.Block]bool)
|
|
txFeed = make(map[chan<- *transaction.Transaction]bool)
|
|
notificationFeed = make(map[chan<- *state.NotificationEvent]bool)
|
|
executionFeed = make(map[chan<- *state.AppExecResult]bool)
|
|
)
|
|
for {
|
|
select {
|
|
case <-bc.stopCh:
|
|
return
|
|
case sub := <-bc.subCh:
|
|
switch ch := sub.(type) {
|
|
case chan<- *block.Block:
|
|
blockFeed[ch] = true
|
|
case chan<- *transaction.Transaction:
|
|
txFeed[ch] = true
|
|
case chan<- *state.NotificationEvent:
|
|
notificationFeed[ch] = true
|
|
case chan<- *state.AppExecResult:
|
|
executionFeed[ch] = true
|
|
default:
|
|
panic(fmt.Sprintf("bad subscription: %T", sub))
|
|
}
|
|
case unsub := <-bc.unsubCh:
|
|
switch ch := unsub.(type) {
|
|
case chan<- *block.Block:
|
|
delete(blockFeed, ch)
|
|
case chan<- *transaction.Transaction:
|
|
delete(txFeed, ch)
|
|
case chan<- *state.NotificationEvent:
|
|
delete(notificationFeed, ch)
|
|
case chan<- *state.AppExecResult:
|
|
delete(executionFeed, ch)
|
|
default:
|
|
panic(fmt.Sprintf("bad unsubscription: %T", unsub))
|
|
}
|
|
case event := <-bc.events:
|
|
// We don't want to waste time looping through transactions when there are no
|
|
// subscribers.
|
|
if len(txFeed) != 0 || len(notificationFeed) != 0 || len(executionFeed) != 0 {
|
|
aer := event.appExecResults[0]
|
|
if !aer.TxHash.Equals(event.block.Hash()) {
|
|
panic("inconsistent application execution results")
|
|
}
|
|
for ch := range executionFeed {
|
|
ch <- aer
|
|
}
|
|
for i := range aer.Events {
|
|
for ch := range notificationFeed {
|
|
ch <- &aer.Events[i]
|
|
}
|
|
}
|
|
|
|
aerIdx := 1
|
|
for _, tx := range event.block.Transactions {
|
|
aer := event.appExecResults[aerIdx]
|
|
if !aer.TxHash.Equals(tx.Hash()) {
|
|
panic("inconsistent application execution results")
|
|
}
|
|
aerIdx++
|
|
for ch := range executionFeed {
|
|
ch <- aer
|
|
}
|
|
if aer.VMState == vm.HaltState {
|
|
for i := range aer.Events {
|
|
for ch := range notificationFeed {
|
|
ch <- &aer.Events[i]
|
|
}
|
|
}
|
|
}
|
|
for ch := range txFeed {
|
|
ch <- tx
|
|
}
|
|
}
|
|
}
|
|
for ch := range blockFeed {
|
|
ch <- event.block
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Close stops Blockchain's internal loop, syncs changes to persistent storage
|
|
// and closes it. The Blockchain is no longer functional after the call to Close.
|
|
func (bc *Blockchain) Close() {
|
|
// If there is a block addition in progress, wait for it to finish and
|
|
// don't allow new ones.
|
|
bc.addLock.Lock()
|
|
close(bc.stopCh)
|
|
<-bc.runToExitCh
|
|
bc.addLock.Unlock()
|
|
}
|
|
|
|
// AddBlock accepts successive block for the Blockchain, verifies it and
|
|
// stores internally. Eventually it will be persisted to the backing storage.
|
|
func (bc *Blockchain) AddBlock(block *block.Block) error {
|
|
bc.addLock.Lock()
|
|
defer bc.addLock.Unlock()
|
|
|
|
expectedHeight := bc.BlockHeight() + 1
|
|
if expectedHeight != block.Index {
|
|
return fmt.Errorf("expected %d, got %d: %w", expectedHeight, block.Index, ErrInvalidBlockIndex)
|
|
}
|
|
|
|
headerLen := bc.headerListLen()
|
|
if int(block.Index) == headerLen {
|
|
err := bc.addHeaders(bc.config.VerifyBlocks, block.Header())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if bc.config.VerifyBlocks {
|
|
err := block.Verify()
|
|
if err != nil {
|
|
return fmt.Errorf("block %s is invalid: %w", block.Hash().StringLE(), err)
|
|
}
|
|
if bc.config.VerifyTransactions {
|
|
for _, tx := range block.Transactions {
|
|
err := bc.VerifyTx(tx, block)
|
|
if err != nil {
|
|
return fmt.Errorf("transaction %s failed to verify: %w", tx.Hash().StringLE(), err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return bc.storeBlock(block)
|
|
}
|
|
|
|
// AddHeaders processes the given headers and add them to the
|
|
// HeaderHashList. It expects headers to be sorted by index.
|
|
func (bc *Blockchain) AddHeaders(headers ...*block.Header) error {
|
|
return bc.addHeaders(bc.config.VerifyBlocks, headers...)
|
|
}
|
|
|
|
// addHeaders is an internal implementation of AddHeaders (`verify` parameter
|
|
// tells it to verify or not verify given headers).
|
|
func (bc *Blockchain) addHeaders(verify bool, headers ...*block.Header) (err error) {
|
|
var (
|
|
start = time.Now()
|
|
batch = bc.dao.Store.Batch()
|
|
)
|
|
|
|
if len(headers) > 0 {
|
|
var i int
|
|
curHeight := bc.HeaderHeight()
|
|
for i = range headers {
|
|
if headers[i].Index > curHeight {
|
|
break
|
|
}
|
|
}
|
|
headers = headers[i:]
|
|
}
|
|
|
|
if len(headers) == 0 {
|
|
return nil
|
|
} else if verify {
|
|
// Verify that the chain of the headers is consistent.
|
|
var lastHeader *block.Header
|
|
if lastHeader, err = bc.GetHeader(headers[0].PrevHash); err != nil {
|
|
return fmt.Errorf("previous header was not found: %w", err)
|
|
}
|
|
for _, h := range headers {
|
|
if err = bc.verifyHeader(h, lastHeader); err != nil {
|
|
return
|
|
}
|
|
lastHeader = h
|
|
}
|
|
}
|
|
|
|
bc.headersOp <- func(headerList *HeaderHashList) {
|
|
oldlen := headerList.Len()
|
|
for _, h := range headers {
|
|
if int(h.Index-1) >= headerList.Len() {
|
|
err = fmt.Errorf(
|
|
"height of received header %d is higher then the current header %d",
|
|
h.Index, headerList.Len(),
|
|
)
|
|
return
|
|
}
|
|
if int(h.Index) < headerList.Len() {
|
|
continue
|
|
}
|
|
if !h.Verify() {
|
|
err = fmt.Errorf("header %v is invalid", h)
|
|
return
|
|
}
|
|
if err = bc.processHeader(h, batch, headerList); err != nil {
|
|
return
|
|
}
|
|
}
|
|
|
|
if oldlen != headerList.Len() {
|
|
updateHeaderHeightMetric(headerList.Len() - 1)
|
|
if err = bc.dao.Store.PutBatch(batch); err != nil {
|
|
return
|
|
}
|
|
bc.log.Debug("done processing headers",
|
|
zap.Int("headerIndex", headerList.Len()-1),
|
|
zap.Uint32("blockHeight", bc.BlockHeight()),
|
|
zap.Duration("took", time.Since(start)))
|
|
}
|
|
}
|
|
<-bc.headersOpDone
|
|
return err
|
|
}
|
|
|
|
// processHeader processes the given header. Note that this is only thread safe
|
|
// if executed in headers operation.
|
|
func (bc *Blockchain) processHeader(h *block.Header, batch storage.Batch, headerList *HeaderHashList) error {
|
|
headerList.Add(h.Hash())
|
|
|
|
buf := io.NewBufBinWriter()
|
|
for int(h.Index)-headerBatchCount >= int(bc.storedHeaderCount) {
|
|
if err := headerList.Write(buf.BinWriter, int(bc.storedHeaderCount), headerBatchCount); err != nil {
|
|
return err
|
|
}
|
|
key := storage.AppendPrefixInt(storage.IXHeaderHashList, int(bc.storedHeaderCount))
|
|
batch.Put(key, buf.Bytes())
|
|
bc.storedHeaderCount += headerBatchCount
|
|
buf.Reset()
|
|
}
|
|
|
|
buf.Reset()
|
|
h.EncodeBinary(buf.BinWriter)
|
|
if buf.Err != nil {
|
|
return buf.Err
|
|
}
|
|
|
|
key := storage.AppendPrefix(storage.DataBlock, h.Hash().BytesLE())
|
|
batch.Put(key, buf.Bytes())
|
|
batch.Put(storage.SYSCurrentHeader.Bytes(), hashAndIndexToBytes(h.Hash(), h.Index))
|
|
|
|
return nil
|
|
}
|
|
|
|
// GetStateRoot returns state root for a given height.
|
|
func (bc *Blockchain) GetStateRoot(height uint32) (*state.MPTRootState, error) {
|
|
return bc.dao.GetStateRoot(height)
|
|
}
|
|
|
|
// storeBlock performs chain update using the block given, it executes all
|
|
// transactions with all appropriate side-effects and updates Blockchain state.
|
|
// This is the only way to change Blockchain state.
|
|
func (bc *Blockchain) storeBlock(block *block.Block) error {
|
|
cache := dao.NewCached(bc.dao)
|
|
appExecResults := make([]*state.AppExecResult, 0, 1+len(block.Transactions))
|
|
if err := cache.StoreAsBlock(block); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := cache.StoreAsCurrentBlock(block); err != nil {
|
|
return err
|
|
}
|
|
|
|
if block.Index > 0 {
|
|
systemInterop := bc.newInteropContext(trigger.System, cache, block, nil)
|
|
v := systemInterop.SpawnVM()
|
|
v.LoadScriptWithFlags(bc.contracts.GetPersistScript(), smartcontract.AllowModifyStates|smartcontract.AllowCall)
|
|
v.SetPriceGetter(getPrice)
|
|
if err := v.Run(); err != nil {
|
|
return fmt.Errorf("onPersist run failed: %w", err)
|
|
} else if _, err := systemInterop.DAO.Persist(); err != nil {
|
|
return fmt.Errorf("can't save onPersist changes: %w", err)
|
|
}
|
|
for i := range systemInterop.Notifications {
|
|
bc.handleNotification(&systemInterop.Notifications[i], cache, block, block.Hash())
|
|
}
|
|
aer := &state.AppExecResult{
|
|
TxHash: block.Hash(), // application logs can be retrieved by block hash
|
|
Trigger: trigger.System,
|
|
VMState: v.State(),
|
|
GasConsumed: v.GasConsumed(),
|
|
Stack: v.Estack().ToArray(),
|
|
Events: systemInterop.Notifications,
|
|
}
|
|
appExecResults = append(appExecResults, aer)
|
|
err := cache.PutAppExecResult(aer)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to store onPersist exec result: %w", err)
|
|
}
|
|
}
|
|
|
|
for _, tx := range block.Transactions {
|
|
if err := cache.StoreAsTransaction(tx, block.Index); err != nil {
|
|
return err
|
|
}
|
|
|
|
systemInterop := bc.newInteropContext(trigger.Application, cache, block, tx)
|
|
v := systemInterop.SpawnVM()
|
|
v.LoadScriptWithFlags(tx.Script, smartcontract.All)
|
|
v.SetPriceGetter(getPrice)
|
|
v.GasLimit = tx.SystemFee
|
|
|
|
err := v.Run()
|
|
if !v.HasFailed() {
|
|
_, err := systemInterop.DAO.Persist()
|
|
if err != nil {
|
|
return fmt.Errorf("failed to persist invocation results: %w", err)
|
|
}
|
|
for i := range systemInterop.Notifications {
|
|
bc.handleNotification(&systemInterop.Notifications[i], cache, block, tx.Hash())
|
|
}
|
|
} else {
|
|
bc.log.Warn("contract invocation failed",
|
|
zap.String("tx", tx.Hash().StringLE()),
|
|
zap.Uint32("block", block.Index),
|
|
zap.Error(err))
|
|
}
|
|
aer := &state.AppExecResult{
|
|
TxHash: tx.Hash(),
|
|
Trigger: trigger.Application,
|
|
VMState: v.State(),
|
|
GasConsumed: v.GasConsumed(),
|
|
Stack: v.Estack().ToArray(),
|
|
Events: systemInterop.Notifications,
|
|
}
|
|
appExecResults = append(appExecResults, aer)
|
|
err = cache.PutAppExecResult(aer)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to store tx exec result: %w", err)
|
|
}
|
|
}
|
|
|
|
root := bc.dao.MPT.StateRoot()
|
|
var prevHash util.Uint256
|
|
if block.Index > 0 {
|
|
prev, err := bc.dao.GetStateRoot(block.Index - 1)
|
|
if err != nil {
|
|
return fmt.Errorf("can't get previous state root: %w", err)
|
|
}
|
|
prevHash = hash.DoubleSha256(prev.GetSignedPart())
|
|
}
|
|
err := bc.AddStateRoot(&state.MPTRoot{
|
|
MPTRootBase: state.MPTRootBase{
|
|
Index: block.Index,
|
|
PrevHash: prevHash,
|
|
Root: root,
|
|
},
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if bc.config.SaveStorageBatch {
|
|
bc.lastBatch = cache.DAO.GetBatch()
|
|
}
|
|
|
|
bc.lock.Lock()
|
|
_, err = cache.Persist()
|
|
if err != nil {
|
|
bc.lock.Unlock()
|
|
return err
|
|
}
|
|
bc.contracts.Policy.OnPersistEnd(bc.dao)
|
|
bc.dao.MPT.Flush()
|
|
// Every persist cycle we also compact our in-memory MPT.
|
|
persistedHeight := atomic.LoadUint32(&bc.persistedHeight)
|
|
if persistedHeight == block.Index-1 {
|
|
// 10 is good and roughly estimated to fit remaining trie into 1M of memory.
|
|
bc.dao.MPT.Collapse(10)
|
|
}
|
|
bc.topBlock.Store(block)
|
|
atomic.StoreUint32(&bc.blockHeight, block.Index)
|
|
bc.memPool.RemoveStale(bc.isTxStillRelevant, bc)
|
|
bc.lock.Unlock()
|
|
|
|
updateBlockHeightMetric(block.Index)
|
|
// Genesis block is stored when Blockchain is not yet running, so there
|
|
// is no one to read this event. And it doesn't make much sense as event
|
|
// anyway.
|
|
if block.Index != 0 {
|
|
bc.events <- bcEvent{block, appExecResults}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (bc *Blockchain) handleNotification(note *state.NotificationEvent, d *dao.Cached, b *block.Block, h util.Uint256) {
|
|
if note.Name != "transfer" && note.Name != "Transfer" {
|
|
return
|
|
}
|
|
arr, ok := note.Item.Value().([]stackitem.Item)
|
|
if !ok || len(arr) != 3 {
|
|
return
|
|
}
|
|
var from []byte
|
|
fromValue := arr[0].Value()
|
|
// we don't have `from` set when we are minting tokens
|
|
if fromValue != nil {
|
|
from, ok = fromValue.([]byte)
|
|
if !ok {
|
|
return
|
|
}
|
|
}
|
|
var to []byte
|
|
toValue := arr[1].Value()
|
|
// we don't have `to` set when we are burning tokens
|
|
if toValue != nil {
|
|
to, ok = toValue.([]byte)
|
|
if !ok {
|
|
return
|
|
}
|
|
}
|
|
amount, ok := arr[2].Value().(*big.Int)
|
|
if !ok {
|
|
bs, ok := arr[2].Value().([]byte)
|
|
if !ok {
|
|
return
|
|
}
|
|
amount = bigint.FromBytes(bs)
|
|
}
|
|
bc.processNEP5Transfer(d, h, b, note.ScriptHash, from, to, amount)
|
|
}
|
|
|
|
func parseUint160(addr []byte) util.Uint160 {
|
|
if u, err := util.Uint160DecodeBytesBE(addr); err == nil {
|
|
return u
|
|
}
|
|
return util.Uint160{}
|
|
}
|
|
|
|
func (bc *Blockchain) processNEP5Transfer(cache *dao.Cached, h util.Uint256, b *block.Block, sc util.Uint160, from, to []byte, amount *big.Int) {
|
|
toAddr := parseUint160(to)
|
|
fromAddr := parseUint160(from)
|
|
var id int32
|
|
nativeContract := bc.contracts.ByHash(sc)
|
|
if nativeContract != nil {
|
|
id = nativeContract.Metadata().ContractID
|
|
} else {
|
|
assetContract := bc.GetContractState(sc)
|
|
if assetContract == nil {
|
|
return
|
|
}
|
|
id = assetContract.ID
|
|
}
|
|
transfer := &state.NEP5Transfer{
|
|
Asset: id,
|
|
From: fromAddr,
|
|
To: toAddr,
|
|
Block: b.Index,
|
|
Timestamp: b.Timestamp,
|
|
Tx: h,
|
|
}
|
|
if !fromAddr.Equals(util.Uint160{}) {
|
|
balances, err := cache.GetNEP5Balances(fromAddr)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bs := balances.Trackers[id]
|
|
bs.Balance = *new(big.Int).Sub(&bs.Balance, amount)
|
|
bs.LastUpdatedBlock = b.Index
|
|
balances.Trackers[id] = bs
|
|
transfer.Amount = *new(big.Int).Sub(&transfer.Amount, amount)
|
|
isBig, err := cache.AppendNEP5Transfer(fromAddr, balances.NextTransferBatch, transfer)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if isBig {
|
|
balances.NextTransferBatch++
|
|
}
|
|
if err := cache.PutNEP5Balances(fromAddr, balances); err != nil {
|
|
return
|
|
}
|
|
}
|
|
if !toAddr.Equals(util.Uint160{}) {
|
|
balances, err := cache.GetNEP5Balances(toAddr)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bs := balances.Trackers[id]
|
|
bs.Balance = *new(big.Int).Add(&bs.Balance, amount)
|
|
bs.LastUpdatedBlock = b.Index
|
|
balances.Trackers[id] = bs
|
|
|
|
transfer.Amount = *amount
|
|
isBig, err := cache.AppendNEP5Transfer(toAddr, balances.NextTransferBatch, transfer)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if isBig {
|
|
balances.NextTransferBatch++
|
|
}
|
|
if err := cache.PutNEP5Balances(toAddr, balances); err != nil {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// GetNEP5TransferLog returns NEP5 transfer log for the acc.
|
|
func (bc *Blockchain) GetNEP5TransferLog(acc util.Uint160) *state.NEP5TransferLog {
|
|
balances, err := bc.dao.GetNEP5Balances(acc)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
result := new(state.NEP5TransferLog)
|
|
for i := uint32(0); i <= balances.NextTransferBatch; i++ {
|
|
lg, err := bc.dao.GetNEP5TransferLog(acc, i)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
result.Raw = append(result.Raw, lg.Raw...)
|
|
}
|
|
return result
|
|
}
|
|
|
|
// GetNEP5Balances returns NEP5 balances for the acc.
|
|
func (bc *Blockchain) GetNEP5Balances(acc util.Uint160) *state.NEP5Balances {
|
|
bs, err := bc.dao.GetNEP5Balances(acc)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return bs
|
|
}
|
|
|
|
// GetUtilityTokenBalance returns utility token (GAS) balance for the acc.
|
|
func (bc *Blockchain) GetUtilityTokenBalance(acc util.Uint160) *big.Int {
|
|
bs, err := bc.dao.GetNEP5Balances(acc)
|
|
if err != nil {
|
|
return big.NewInt(0)
|
|
}
|
|
balance := bs.Trackers[bc.contracts.GAS.ContractID].Balance
|
|
return &balance
|
|
}
|
|
|
|
// GetGoverningTokenBalance returns governing token (NEO) balance and the height
|
|
// of the last balance change for the account.
|
|
func (bc *Blockchain) GetGoverningTokenBalance(acc util.Uint160) (*big.Int, uint32) {
|
|
bs, err := bc.dao.GetNEP5Balances(acc)
|
|
if err != nil {
|
|
return big.NewInt(0), 0
|
|
}
|
|
neo := bs.Trackers[bc.contracts.NEO.ContractID]
|
|
return &neo.Balance, neo.LastUpdatedBlock
|
|
}
|
|
|
|
// LastBatch returns last persisted storage batch.
|
|
func (bc *Blockchain) LastBatch() *storage.MemBatch {
|
|
return bc.lastBatch
|
|
}
|
|
|
|
// persist flushes current in-memory Store contents to the persistent storage.
|
|
func (bc *Blockchain) persist() error {
|
|
var (
|
|
start = time.Now()
|
|
persisted int
|
|
err error
|
|
)
|
|
|
|
persisted, err = bc.dao.Persist()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if persisted > 0 {
|
|
bHeight, err := bc.dao.GetCurrentBlockHeight()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
oldHeight := atomic.SwapUint32(&bc.persistedHeight, bHeight)
|
|
diff := bHeight - oldHeight
|
|
|
|
storedHeaderHeight, _, err := bc.dao.GetCurrentHeaderHeight()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
bc.log.Info("blockchain persist completed",
|
|
zap.Uint32("persistedBlocks", diff),
|
|
zap.Int("persistedKeys", persisted),
|
|
zap.Uint32("headerHeight", storedHeaderHeight),
|
|
zap.Uint32("blockHeight", bHeight),
|
|
zap.Duration("took", time.Since(start)))
|
|
|
|
// update monitoring metrics.
|
|
updatePersistedHeightMetric(bHeight)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (bc *Blockchain) headerListLen() (n int) {
|
|
bc.headersOp <- func(headerList *HeaderHashList) {
|
|
n = headerList.Len()
|
|
}
|
|
<-bc.headersOpDone
|
|
return
|
|
}
|
|
|
|
// GetTransaction returns a TX and its height by the given hash.
|
|
func (bc *Blockchain) GetTransaction(hash util.Uint256) (*transaction.Transaction, uint32, error) {
|
|
if tx, ok := bc.memPool.TryGetValue(hash); ok {
|
|
return tx, 0, nil // the height is not actually defined for memPool transaction. Not sure if zero is a good number in this case.
|
|
}
|
|
return bc.dao.GetTransaction(hash)
|
|
}
|
|
|
|
// GetAppExecResult returns application execution result by the given
|
|
// tx hash.
|
|
func (bc *Blockchain) GetAppExecResult(hash util.Uint256) (*state.AppExecResult, error) {
|
|
return bc.dao.GetAppExecResult(hash)
|
|
}
|
|
|
|
// GetStorageItem returns an item from storage.
|
|
func (bc *Blockchain) GetStorageItem(id int32, key []byte) *state.StorageItem {
|
|
return bc.dao.GetStorageItem(id, key)
|
|
}
|
|
|
|
// GetStorageItems returns all storage items for a given contract id.
|
|
func (bc *Blockchain) GetStorageItems(id int32) (map[string]*state.StorageItem, error) {
|
|
return bc.dao.GetStorageItems(id)
|
|
}
|
|
|
|
// GetBlock returns a Block by the given hash.
|
|
func (bc *Blockchain) GetBlock(hash util.Uint256) (*block.Block, error) {
|
|
topBlock := bc.topBlock.Load()
|
|
if topBlock != nil {
|
|
if tb, ok := topBlock.(*block.Block); ok && tb.Hash().Equals(hash) {
|
|
return tb, nil
|
|
}
|
|
}
|
|
|
|
block, err := bc.dao.GetBlock(hash)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, tx := range block.Transactions {
|
|
stx, _, err := bc.dao.GetTransaction(tx.Hash())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
*tx = *stx
|
|
}
|
|
return block, nil
|
|
}
|
|
|
|
// GetHeader returns data block header identified with the given hash value.
|
|
func (bc *Blockchain) GetHeader(hash util.Uint256) (*block.Header, error) {
|
|
topBlock := bc.topBlock.Load()
|
|
if topBlock != nil {
|
|
if tb, ok := topBlock.(*block.Block); ok && tb.Hash().Equals(hash) {
|
|
return tb.Header(), nil
|
|
}
|
|
}
|
|
block, err := bc.dao.GetBlock(hash)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return block.Header(), nil
|
|
}
|
|
|
|
// HasTransaction returns true if the blockchain contains he given
|
|
// transaction hash.
|
|
func (bc *Blockchain) HasTransaction(hash util.Uint256) bool {
|
|
return bc.memPool.ContainsKey(hash) || bc.dao.HasTransaction(hash)
|
|
}
|
|
|
|
// HasBlock returns true if the blockchain contains the given
|
|
// block hash.
|
|
func (bc *Blockchain) HasBlock(hash util.Uint256) bool {
|
|
if header, err := bc.GetHeader(hash); err == nil {
|
|
return header.Index <= bc.BlockHeight()
|
|
}
|
|
return false
|
|
}
|
|
|
|
// CurrentBlockHash returns the highest processed block hash.
|
|
func (bc *Blockchain) CurrentBlockHash() (hash util.Uint256) {
|
|
bc.headersOp <- func(headerList *HeaderHashList) {
|
|
hash = headerList.Get(int(bc.BlockHeight()))
|
|
}
|
|
<-bc.headersOpDone
|
|
return
|
|
}
|
|
|
|
// CurrentHeaderHash returns the hash of the latest known header.
|
|
func (bc *Blockchain) CurrentHeaderHash() (hash util.Uint256) {
|
|
bc.headersOp <- func(headerList *HeaderHashList) {
|
|
hash = headerList.Last()
|
|
}
|
|
<-bc.headersOpDone
|
|
return
|
|
}
|
|
|
|
// GetHeaderHash returns the hash from the headerList by its
|
|
// height/index.
|
|
func (bc *Blockchain) GetHeaderHash(i int) (hash util.Uint256) {
|
|
bc.headersOp <- func(headerList *HeaderHashList) {
|
|
hash = headerList.Get(i)
|
|
}
|
|
<-bc.headersOpDone
|
|
return
|
|
}
|
|
|
|
// BlockHeight returns the height/index of the highest block.
|
|
func (bc *Blockchain) BlockHeight() uint32 {
|
|
return atomic.LoadUint32(&bc.blockHeight)
|
|
}
|
|
|
|
// HeaderHeight returns the index/height of the highest header.
|
|
func (bc *Blockchain) HeaderHeight() uint32 {
|
|
return uint32(bc.headerListLen() - 1)
|
|
}
|
|
|
|
// GetContractState returns contract by its script hash.
|
|
func (bc *Blockchain) GetContractState(hash util.Uint160) *state.Contract {
|
|
contract, err := bc.dao.GetContractState(hash)
|
|
if contract == nil && err != storage.ErrKeyNotFound {
|
|
bc.log.Warn("failed to get contract state", zap.Error(err))
|
|
}
|
|
return contract
|
|
}
|
|
|
|
// GetContractScriptHash returns contract script hash by its ID.
|
|
func (bc *Blockchain) GetContractScriptHash(id int32) (util.Uint160, error) {
|
|
return bc.dao.GetContractScriptHash(id)
|
|
}
|
|
|
|
// GetAccountState returns the account state from its script hash.
|
|
func (bc *Blockchain) GetAccountState(scriptHash util.Uint160) *state.Account {
|
|
as, err := bc.dao.GetAccountState(scriptHash)
|
|
if as == nil && err != storage.ErrKeyNotFound {
|
|
bc.log.Warn("failed to get account state", zap.Error(err))
|
|
}
|
|
return as
|
|
}
|
|
|
|
// GetConfig returns the config stored in the blockchain.
|
|
func (bc *Blockchain) GetConfig() config.ProtocolConfiguration {
|
|
return bc.config
|
|
}
|
|
|
|
// SubscribeForBlocks adds given channel to new block event broadcasting, so when
|
|
// there is a new block added to the chain you'll receive it via this channel.
|
|
// Make sure it's read from regularly as not reading these events might affect
|
|
// other Blockchain functions.
|
|
func (bc *Blockchain) SubscribeForBlocks(ch chan<- *block.Block) {
|
|
bc.subCh <- ch
|
|
}
|
|
|
|
// SubscribeForTransactions adds given channel to new transaction event
|
|
// broadcasting, so when there is a new transaction added to the chain (in a
|
|
// block) you'll receive it via this channel. Make sure it's read from regularly
|
|
// as not reading these events might affect other Blockchain functions.
|
|
func (bc *Blockchain) SubscribeForTransactions(ch chan<- *transaction.Transaction) {
|
|
bc.subCh <- ch
|
|
}
|
|
|
|
// SubscribeForNotifications adds given channel to new notifications event
|
|
// broadcasting, so when an in-block transaction execution generates a
|
|
// notification you'll receive it via this channel. Only notifications from
|
|
// successful transactions are broadcasted, if you're interested in failed
|
|
// transactions use SubscribeForExecutions instead. Make sure this channel is
|
|
// read from regularly as not reading these events might affect other Blockchain
|
|
// functions.
|
|
func (bc *Blockchain) SubscribeForNotifications(ch chan<- *state.NotificationEvent) {
|
|
bc.subCh <- ch
|
|
}
|
|
|
|
// SubscribeForExecutions adds given channel to new transaction execution event
|
|
// broadcasting, so when an in-block transaction execution happens you'll receive
|
|
// the result of it via this channel. Make sure it's read from regularly as not
|
|
// reading these events might affect other Blockchain functions.
|
|
func (bc *Blockchain) SubscribeForExecutions(ch chan<- *state.AppExecResult) {
|
|
bc.subCh <- ch
|
|
}
|
|
|
|
// UnsubscribeFromBlocks unsubscribes given channel from new block notifications,
|
|
// you can close it afterwards. Passing non-subscribed channel is a no-op.
|
|
func (bc *Blockchain) UnsubscribeFromBlocks(ch chan<- *block.Block) {
|
|
bc.unsubCh <- ch
|
|
}
|
|
|
|
// UnsubscribeFromTransactions unsubscribes given channel from new transaction
|
|
// notifications, you can close it afterwards. Passing non-subscribed channel is
|
|
// a no-op.
|
|
func (bc *Blockchain) UnsubscribeFromTransactions(ch chan<- *transaction.Transaction) {
|
|
bc.unsubCh <- ch
|
|
}
|
|
|
|
// UnsubscribeFromNotifications unsubscribes given channel from new
|
|
// execution-generated notifications, you can close it afterwards. Passing
|
|
// non-subscribed channel is a no-op.
|
|
func (bc *Blockchain) UnsubscribeFromNotifications(ch chan<- *state.NotificationEvent) {
|
|
bc.unsubCh <- ch
|
|
}
|
|
|
|
// UnsubscribeFromExecutions unsubscribes given channel from new execution
|
|
// notifications, you can close it afterwards. Passing non-subscribed channel is
|
|
// a no-op.
|
|
func (bc *Blockchain) UnsubscribeFromExecutions(ch chan<- *state.AppExecResult) {
|
|
bc.unsubCh <- ch
|
|
}
|
|
|
|
// CalculateClaimable calculates the amount of GAS generated by owning specified
|
|
// amount of NEO between specified blocks. The amount of NEO being passed is in
|
|
// its natural non-divisible form (1 NEO as 1, 2 NEO as 2, no multiplication by
|
|
// 10⁸ is needed as for Fixed8).
|
|
func (bc *Blockchain) CalculateClaimable(value *big.Int, startHeight, endHeight uint32) *big.Int {
|
|
var amount int64
|
|
di := uint32(bc.decrementInterval)
|
|
|
|
ustart := startHeight / di
|
|
if genSize := uint32(len(bc.generationAmount)); ustart < genSize {
|
|
uend := endHeight / di
|
|
iend := endHeight % di
|
|
if uend >= genSize {
|
|
uend = genSize - 1
|
|
iend = di
|
|
} else if iend == 0 {
|
|
uend--
|
|
iend = di
|
|
}
|
|
|
|
istart := startHeight % di
|
|
for ustart < uend {
|
|
amount += int64(di-istart) * int64(bc.generationAmount[ustart])
|
|
ustart++
|
|
istart = 0
|
|
}
|
|
|
|
amount += int64(iend-istart) * int64(bc.generationAmount[ustart])
|
|
}
|
|
|
|
return new(big.Int).Mul(big.NewInt(amount), value)
|
|
}
|
|
|
|
// FeePerByte returns transaction network fee per byte.
|
|
func (bc *Blockchain) FeePerByte() int64 {
|
|
return bc.contracts.Policy.GetFeePerByteInternal(bc.dao)
|
|
}
|
|
|
|
// GetMaxBlockSize returns maximum allowed block size from native Policy contract.
|
|
func (bc *Blockchain) GetMaxBlockSize() uint32 {
|
|
return bc.contracts.Policy.GetMaxBlockSizeInternal(bc.dao)
|
|
}
|
|
|
|
// GetMaxBlockSystemFee returns maximum block system fee from native Policy contract.
|
|
func (bc *Blockchain) GetMaxBlockSystemFee() int64 {
|
|
return bc.contracts.Policy.GetMaxBlockSystemFeeInternal(bc.dao)
|
|
}
|
|
|
|
// GetMemPool returns the memory pool of the blockchain.
|
|
func (bc *Blockchain) GetMemPool() *mempool.Pool {
|
|
return &bc.memPool
|
|
}
|
|
|
|
// ApplyPolicyToTxSet applies configured policies to given transaction set. It
|
|
// expects slice to be ordered by fee and returns a subslice of it.
|
|
func (bc *Blockchain) ApplyPolicyToTxSet(txes []*transaction.Transaction) []*transaction.Transaction {
|
|
maxTx := bc.contracts.Policy.GetMaxTransactionsPerBlockInternal(bc.dao)
|
|
if maxTx != 0 && len(txes) > int(maxTx) {
|
|
txes = txes[:maxTx]
|
|
}
|
|
maxBlockSize := bc.contracts.Policy.GetMaxBlockSizeInternal(bc.dao)
|
|
maxBlockSysFee := bc.contracts.Policy.GetMaxBlockSystemFeeInternal(bc.dao)
|
|
var (
|
|
blockSize uint32
|
|
sysFee int64
|
|
)
|
|
blockSize = uint32(io.GetVarSize(new(block.Block)) + io.GetVarSize(len(txes)+1))
|
|
for i, tx := range txes {
|
|
blockSize += uint32(io.GetVarSize(tx))
|
|
sysFee += tx.SystemFee
|
|
if blockSize > maxBlockSize || sysFee > maxBlockSysFee {
|
|
txes = txes[:i]
|
|
break
|
|
}
|
|
}
|
|
return txes
|
|
}
|
|
|
|
func (bc *Blockchain) verifyHeader(currHeader, prevHeader *block.Header) error {
|
|
if prevHeader.Hash() != currHeader.PrevHash {
|
|
return errors.New("previous header hash doesn't match")
|
|
}
|
|
if prevHeader.Index+1 != currHeader.Index {
|
|
return errors.New("previous header index doesn't match")
|
|
}
|
|
if prevHeader.Timestamp >= currHeader.Timestamp {
|
|
return errors.New("block is not newer than the previous one")
|
|
}
|
|
return bc.verifyHeaderWitnesses(currHeader, prevHeader)
|
|
}
|
|
|
|
// verifyTx verifies whether a transaction is bonafide or not.
|
|
func (bc *Blockchain) verifyTx(t *transaction.Transaction, block *block.Block) error {
|
|
height := bc.BlockHeight()
|
|
if t.ValidUntilBlock <= height || t.ValidUntilBlock > height+transaction.MaxValidUntilBlockIncrement {
|
|
return fmt.Errorf("transaction has expired. ValidUntilBlock = %d, current height = %d", t.ValidUntilBlock, height)
|
|
}
|
|
blockedAccounts, err := bc.contracts.Policy.GetBlockedAccountsInternal(bc.dao)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, signer := range t.Signers {
|
|
i := sort.Search(len(blockedAccounts), func(i int) bool {
|
|
return !blockedAccounts[i].Less(signer.Account)
|
|
})
|
|
if i != len(blockedAccounts) && blockedAccounts[i].Equals(signer.Account) {
|
|
return fmt.Errorf("policy check failed: account %s is blocked", signer.Account.StringLE())
|
|
}
|
|
}
|
|
maxBlockSystemFee := bc.contracts.Policy.GetMaxBlockSystemFeeInternal(bc.dao)
|
|
if maxBlockSystemFee < t.SystemFee {
|
|
return fmt.Errorf("policy check failed: transaction's fee shouldn't exceed maximum block system fee %d", maxBlockSystemFee)
|
|
}
|
|
balance := bc.GetUtilityTokenBalance(t.Sender())
|
|
need := t.SystemFee + t.NetworkFee
|
|
if balance.Cmp(big.NewInt(need)) < 0 {
|
|
return fmt.Errorf("insufficient funds: balance is %v, need: %v", balance, need)
|
|
}
|
|
size := io.GetVarSize(t)
|
|
if size > transaction.MaxTransactionSize {
|
|
return fmt.Errorf("too big transaction (%d > MaxTransactionSize %d)", size, transaction.MaxTransactionSize)
|
|
}
|
|
needNetworkFee := int64(size) * bc.FeePerByte()
|
|
netFee := t.NetworkFee - needNetworkFee
|
|
if netFee < 0 {
|
|
return fmt.Errorf("insufficient funds: net fee is %v, need %v", t.NetworkFee, needNetworkFee)
|
|
}
|
|
if block == nil {
|
|
if ok := bc.memPool.Verify(t, bc); !ok {
|
|
return errors.New("invalid transaction due to conflicts with the memory pool")
|
|
}
|
|
}
|
|
|
|
return bc.verifyTxWitnesses(t, block)
|
|
}
|
|
|
|
// isTxStillRelevant is a callback for mempool transaction filtering after the
|
|
// new block addition. It returns false for transactions already present in the
|
|
// chain (added by the new block), transactions using some inputs that are
|
|
// already used (double spends) and does witness reverification for non-standard
|
|
// contracts. It operates under the assumption that full transaction verification
|
|
// was already done so we don't need to check basic things like size, input/output
|
|
// correctness, etc.
|
|
func (bc *Blockchain) isTxStillRelevant(t *transaction.Transaction) bool {
|
|
var recheckWitness bool
|
|
|
|
if bc.dao.HasTransaction(t.Hash()) {
|
|
return false
|
|
}
|
|
for i := range t.Scripts {
|
|
if !vm.IsStandardContract(t.Scripts[i].VerificationScript) {
|
|
recheckWitness = true
|
|
break
|
|
}
|
|
}
|
|
if recheckWitness {
|
|
return bc.verifyTxWitnesses(t, nil) == nil
|
|
}
|
|
return true
|
|
|
|
}
|
|
|
|
// AddStateRoot add new (possibly unverified) state root to the blockchain.
|
|
func (bc *Blockchain) AddStateRoot(r *state.MPTRoot) error {
|
|
our, err := bc.GetStateRoot(r.Index)
|
|
if err == nil {
|
|
if our.Flag == state.Verified {
|
|
return bc.updateStateHeight(r.Index)
|
|
} else if r.Witness == nil && our.Witness != nil {
|
|
r.Witness = our.Witness
|
|
}
|
|
}
|
|
if err := bc.verifyStateRoot(r); err != nil {
|
|
return fmt.Errorf("invalid state root: %w", err)
|
|
}
|
|
if r.Index > bc.BlockHeight() { // just put it into the store for future checks
|
|
return bc.dao.PutStateRoot(&state.MPTRootState{
|
|
MPTRoot: *r,
|
|
Flag: state.Unverified,
|
|
})
|
|
}
|
|
|
|
flag := state.Unverified
|
|
if r.Witness != nil {
|
|
if err := bc.verifyStateRootWitness(r); err != nil {
|
|
return fmt.Errorf("can't verify signature: %w", err)
|
|
}
|
|
flag = state.Verified
|
|
}
|
|
err = bc.dao.PutStateRoot(&state.MPTRootState{
|
|
MPTRoot: *r,
|
|
Flag: flag,
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return bc.updateStateHeight(r.Index)
|
|
}
|
|
|
|
func (bc *Blockchain) updateStateHeight(newHeight uint32) error {
|
|
h, err := bc.dao.GetCurrentStateRootHeight()
|
|
if err != nil {
|
|
return fmt.Errorf("can't get current state root height: %w", err)
|
|
} else if newHeight == h+1 {
|
|
updateStateHeightMetric(newHeight)
|
|
return bc.dao.PutCurrentStateRootHeight(h + 1)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// verifyStateRoot checks if state root is valid.
|
|
func (bc *Blockchain) verifyStateRoot(r *state.MPTRoot) error {
|
|
if r.Index == 0 {
|
|
return nil
|
|
}
|
|
prev, err := bc.GetStateRoot(r.Index - 1)
|
|
if err != nil {
|
|
return errors.New("can't get previous state root")
|
|
} else if !r.PrevHash.Equals(hash.DoubleSha256(prev.GetSignedPart())) {
|
|
return errors.New("previous hash mismatch")
|
|
} else if prev.Version != r.Version {
|
|
return errors.New("version mismatch")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// verifyStateRootWitness verifies that state root signature is correct.
|
|
func (bc *Blockchain) verifyStateRootWitness(r *state.MPTRoot) error {
|
|
b, err := bc.GetBlock(bc.GetHeaderHash(int(r.Index)))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
interopCtx := bc.newInteropContext(trigger.Verification, bc.dao, nil, nil)
|
|
interopCtx.Container = r
|
|
return bc.verifyHashAgainstScript(b.NextConsensus, r.Witness, interopCtx, true,
|
|
bc.contracts.Policy.GetMaxVerificationGas(interopCtx.DAO))
|
|
}
|
|
|
|
// VerifyTx verifies whether a transaction is bonafide or not. Block parameter
|
|
// is used for easy interop access and can be omitted for transactions that are
|
|
// not yet added into any block.
|
|
// Golang implementation of Verify method in C# (https://github.com/neo-project/neo/blob/master/neo/Network/P2P/Payloads/Transaction.cs#L270).
|
|
func (bc *Blockchain) VerifyTx(t *transaction.Transaction, block *block.Block) error {
|
|
bc.lock.RLock()
|
|
defer bc.lock.RUnlock()
|
|
return bc.verifyTx(t, block)
|
|
}
|
|
|
|
// PoolTx verifies and tries to add given transaction into the mempool.
|
|
func (bc *Blockchain) PoolTx(t *transaction.Transaction) error {
|
|
bc.lock.RLock()
|
|
defer bc.lock.RUnlock()
|
|
|
|
if bc.HasTransaction(t.Hash()) {
|
|
return fmt.Errorf("blockchain: %w", ErrAlreadyExists)
|
|
}
|
|
if err := bc.verifyTx(t, nil); err != nil {
|
|
return err
|
|
}
|
|
// Policying.
|
|
if err := bc.contracts.Policy.CheckPolicy(bc.newInteropContext(trigger.Application, bc.dao, nil, t), t); err != nil {
|
|
// Only one %w can be used.
|
|
return fmt.Errorf("%w: %v", ErrPolicy, err)
|
|
}
|
|
if err := bc.memPool.Add(t, bc); err != nil {
|
|
switch {
|
|
case errors.Is(err, mempool.ErrOOM):
|
|
return ErrOOM
|
|
case errors.Is(err, mempool.ErrDup):
|
|
return fmt.Errorf("mempool: %w", ErrAlreadyExists)
|
|
default:
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
//GetStandByValidators returns validators from the configuration.
|
|
func (bc *Blockchain) GetStandByValidators() keys.PublicKeys {
|
|
return bc.sbValidators.Copy()
|
|
}
|
|
|
|
// GetValidators returns current validators.
|
|
func (bc *Blockchain) GetValidators() ([]*keys.PublicKey, error) {
|
|
return bc.contracts.NEO.GetValidatorsInternal(bc, bc.dao)
|
|
}
|
|
|
|
// GetNextBlockValidators returns next block validators.
|
|
func (bc *Blockchain) GetNextBlockValidators() ([]*keys.PublicKey, error) {
|
|
return bc.contracts.NEO.GetNextBlockValidatorsInternal(bc, bc.dao)
|
|
}
|
|
|
|
// GetEnrollments returns all registered validators.
|
|
func (bc *Blockchain) GetEnrollments() ([]state.Validator, error) {
|
|
return bc.contracts.NEO.GetRegisteredValidators(bc.dao)
|
|
}
|
|
|
|
// GetTestVM returns a VM and a Store setup for a test run of some sort of code.
|
|
func (bc *Blockchain) GetTestVM(tx *transaction.Transaction) *vm.VM {
|
|
systemInterop := bc.newInteropContext(trigger.Application, bc.dao, nil, tx)
|
|
vm := systemInterop.SpawnVM()
|
|
vm.SetPriceGetter(getPrice)
|
|
return vm
|
|
}
|
|
|
|
// ScriptFromWitness returns verification script for provided witness.
|
|
// If hash is not equal to the witness script hash, error is returned.
|
|
func ScriptFromWitness(hash util.Uint160, witness *transaction.Witness) ([]byte, error) {
|
|
verification := witness.VerificationScript
|
|
|
|
if len(verification) == 0 {
|
|
bb := io.NewBufBinWriter()
|
|
emit.AppCall(bb.BinWriter, hash)
|
|
verification = bb.Bytes()
|
|
} else if h := witness.ScriptHash(); hash != h {
|
|
return nil, errors.New("witness hash mismatch")
|
|
}
|
|
|
|
return verification, nil
|
|
}
|
|
|
|
// verifyHashAgainstScript verifies given hash against the given witness.
|
|
func (bc *Blockchain) verifyHashAgainstScript(hash util.Uint160, witness *transaction.Witness, interopCtx *interop.Context, useKeys bool, gas int64) error {
|
|
verification, err := ScriptFromWitness(hash, witness)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
gasPolicy := bc.contracts.Policy.GetMaxVerificationGas(interopCtx.DAO)
|
|
if gas > gasPolicy {
|
|
gas = gasPolicy
|
|
}
|
|
|
|
vm := interopCtx.SpawnVM()
|
|
vm.SetPriceGetter(getPrice)
|
|
vm.GasLimit = gas
|
|
vm.LoadScriptWithFlags(verification, smartcontract.NoneFlag)
|
|
vm.LoadScript(witness.InvocationScript)
|
|
if useKeys {
|
|
bc.keyCacheLock.RLock()
|
|
if bc.keyCache[hash] != nil {
|
|
vm.SetPublicKeys(bc.keyCache[hash])
|
|
}
|
|
bc.keyCacheLock.RUnlock()
|
|
}
|
|
err = vm.Run()
|
|
if vm.HasFailed() {
|
|
return fmt.Errorf("vm execution has failed: %w", err)
|
|
}
|
|
resEl := vm.Estack().Pop()
|
|
if resEl != nil {
|
|
if !resEl.Bool() {
|
|
return fmt.Errorf("signature check failed")
|
|
}
|
|
if useKeys {
|
|
bc.keyCacheLock.RLock()
|
|
_, ok := bc.keyCache[hash]
|
|
bc.keyCacheLock.RUnlock()
|
|
if !ok {
|
|
bc.keyCacheLock.Lock()
|
|
bc.keyCache[hash] = vm.GetPublicKeys()
|
|
bc.keyCacheLock.Unlock()
|
|
}
|
|
}
|
|
} else {
|
|
return fmt.Errorf("no result returned from the script")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// verifyTxWitnesses verifies the scripts (witnesses) that come with a given
|
|
// transaction. It can reorder them by ScriptHash, because that's required to
|
|
// match a slice of script hashes from the Blockchain. Block parameter
|
|
// is used for easy interop access and can be omitted for transactions that are
|
|
// not yet added into any block.
|
|
// Golang implementation of VerifyWitnesses method in C# (https://github.com/neo-project/neo/blob/master/neo/SmartContract/Helper.cs#L87).
|
|
func (bc *Blockchain) verifyTxWitnesses(t *transaction.Transaction, block *block.Block) error {
|
|
if len(t.Signers) != len(t.Scripts) {
|
|
return fmt.Errorf("number of signers doesn't match witnesses (%d vs %d)", len(t.Signers), len(t.Scripts))
|
|
}
|
|
interopCtx := bc.newInteropContext(trigger.Verification, bc.dao, block, t)
|
|
for i := range t.Signers {
|
|
err := bc.verifyHashAgainstScript(t.Signers[i].Account, &t.Scripts[i], interopCtx, false, t.NetworkFee)
|
|
if err != nil {
|
|
return fmt.Errorf("witness #%d: %w", i, err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// verifyHeaderWitnesses is a block-specific implementation of VerifyWitnesses logic.
|
|
func (bc *Blockchain) verifyHeaderWitnesses(currHeader, prevHeader *block.Header) error {
|
|
var hash util.Uint160
|
|
if prevHeader == nil && currHeader.PrevHash.Equals(util.Uint256{}) {
|
|
hash = currHeader.Script.ScriptHash()
|
|
} else {
|
|
hash = prevHeader.NextConsensus
|
|
}
|
|
interopCtx := bc.newInteropContext(trigger.Verification, bc.dao, nil, nil)
|
|
interopCtx.Container = currHeader
|
|
return bc.verifyHashAgainstScript(hash, &currHeader.Script, interopCtx, true, verificationGasLimit)
|
|
}
|
|
|
|
// GoverningTokenHash returns the governing token (NEO) native contract hash.
|
|
func (bc *Blockchain) GoverningTokenHash() util.Uint160 {
|
|
return bc.contracts.NEO.Hash
|
|
}
|
|
|
|
// UtilityTokenHash returns the utility token (GAS) native contract hash.
|
|
func (bc *Blockchain) UtilityTokenHash() util.Uint160 {
|
|
return bc.contracts.GAS.Hash
|
|
}
|
|
|
|
func hashAndIndexToBytes(h util.Uint256, index uint32) []byte {
|
|
buf := io.NewBufBinWriter()
|
|
buf.WriteBytes(h.BytesLE())
|
|
buf.WriteU32LE(index)
|
|
return buf.Bytes()
|
|
}
|
|
|
|
func (bc *Blockchain) secondsPerBlock() int {
|
|
return bc.config.SecondsPerBlock
|
|
}
|
|
|
|
func (bc *Blockchain) newInteropContext(trigger trigger.Type, d dao.DAO, block *block.Block, tx *transaction.Transaction) *interop.Context {
|
|
ic := interop.NewContext(trigger, bc, d, bc.contracts.Contracts, block, tx, bc.log)
|
|
ic.Functions = [][]interop.Function{systemInterops, neoInterops}
|
|
switch {
|
|
case tx != nil:
|
|
ic.Container = tx
|
|
case block != nil:
|
|
ic.Container = block
|
|
}
|
|
return ic
|
|
}
|