mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-27 03:58:06 +00:00
82b230f19f
This allow to use `Block` as a Verifiable item. When tx is provided, it is set as an interop's script container. Otherwise, block is set.
2068 lines
61 KiB
Go
2068 lines
61 KiB
Go
package core
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import (
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"fmt"
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"math"
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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/keys"
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"github.com/nspcc-dev/neo-go/pkg/io"
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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/pkg/errors"
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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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// This one comes from C# code and it's different from the constant used
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// when creating an asset with Neo.Asset.Create interop call. It looks
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// like 2000000 is coming from the decrementInterval, but C# code doesn't
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// contain any relationship between the two, so we should follow this
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// behavior.
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registeredAssetLifetime = 2 * 2000000
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defaultMemPoolSize = 50000
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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{8, 7, 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.
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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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log *zap.Logger
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lastBatch *storage.MemBatch
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contracts native.Contracts
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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.
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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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if cfg.MaxTransactionsPerBlock <= 0 {
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cfg.MaxTransactionsPerBlock = 0
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log.Info("MaxTransactionsPerBlock is not set or wrong, setting default value (unlimited)", zap.Int("MaxTransactionsPerBlock", cfg.MaxTransactionsPerBlock))
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}
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if cfg.MaxFreeTransactionsPerBlock <= 0 {
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cfg.MaxFreeTransactionsPerBlock = 0
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log.Info("MaxFreeTransactionsPerBlock is not set or wrong, setting default value (unlimited)", zap.Int("MaxFreeTransactionsPerBlock", cfg.MaxFreeTransactionsPerBlock))
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}
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if cfg.MaxFreeTransactionSize <= 0 {
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cfg.MaxFreeTransactionSize = 0
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log.Info("MaxFreeTransactionSize is not set or wrong, setting default value (unlimited)", zap.Int("MaxFreeTransactionSize", cfg.MaxFreeTransactionSize))
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}
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if cfg.FeePerExtraByte <= 0 {
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cfg.FeePerExtraByte = 0
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log.Info("FeePerExtraByte is not set or wrong, setting default value", zap.Float64("FeePerExtraByte", cfg.FeePerExtraByte))
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}
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bc := &Blockchain{
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config: cfg,
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dao: dao.NewSimple(s),
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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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log: log,
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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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if err := bc.initNative(); 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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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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currHeaderHeight, currHeaderHash, err := bc.dao.GetCurrentHeaderHeight()
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if err != nil {
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return err
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}
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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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// 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
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// 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
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if bc.headerList.Len() > 0 {
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targetHash = bc.headerList.Get(bc.headerList.Len() - 1)
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} 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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}
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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: %s", 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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}
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headerSliceReverse(headers)
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for _, h := range headers {
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if !h.Verify() {
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return fmt.Errorf("bad header %d/%s in the storage", h.Index, h.Hash())
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}
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bc.headerList.Add(h.Hash())
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}
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}
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return nil
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}
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func (bc *Blockchain) initNative() error {
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ic := bc.newInteropContext(trigger.Application, bc.dao, nil, nil)
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gas := native.NewGAS()
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neo := native.NewNEO()
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neo.GAS = gas
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gas.NEO = neo
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if err := gas.Initialize(ic); err != nil {
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return fmt.Errorf("can't initialize GAS native contract: %v", err)
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}
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if err := neo.Initialize(ic); err != nil {
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return fmt.Errorf("can't initialize NEO native contract: %v", err)
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}
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bc.contracts.SetGAS(gas)
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bc.contracts.SetNEO(neo)
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return nil
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}
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// Run runs chain loop.
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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))
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}
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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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}()
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for {
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select {
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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{}{}
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case <-persistTimer.C:
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go func() {
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err := bc.persist()
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if err != nil {
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bc.log.Warn("failed to persist blockchain", zap.Error(err))
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}
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persistTimer.Reset(persistInterval)
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}()
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}
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}
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}
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// Close stops Blockchain's internal loop, syncs changes to persistent storage
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// and closes it. The Blockchain is no longer functional after the call to Close.
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func (bc *Blockchain) Close() {
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close(bc.stopCh)
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<-bc.runToExitCh
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}
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// AddBlock accepts successive block for the Blockchain, verifies it and
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// stores internally. Eventually it will be persisted to the backing storage.
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func (bc *Blockchain) AddBlock(block *block.Block) error {
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bc.addLock.Lock()
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defer bc.addLock.Unlock()
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expectedHeight := bc.BlockHeight() + 1
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if expectedHeight != block.Index {
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return ErrInvalidBlockIndex
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}
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headerLen := bc.headerListLen()
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if int(block.Index) == headerLen {
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err := bc.addHeaders(bc.config.VerifyBlocks, block.Header())
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if err != nil {
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return err
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}
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}
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if bc.config.VerifyBlocks {
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err := block.Verify()
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if err != nil {
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return fmt.Errorf("block %s is invalid: %s", block.Hash().StringLE(), err)
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}
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if bc.config.VerifyTransactions {
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for _, tx := range block.Transactions {
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err := bc.VerifyTx(tx, block)
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if err != nil {
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return fmt.Errorf("transaction %s failed to verify: %s", tx.Hash().StringLE(), err)
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}
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}
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}
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}
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return bc.storeBlock(block)
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}
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// AddHeaders processes the given headers and add them to the
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// HeaderHashList. It expects headers to be sorted by index.
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func (bc *Blockchain) AddHeaders(headers ...*block.Header) error {
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return bc.addHeaders(bc.config.VerifyBlocks, headers...)
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}
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// addHeaders is an internal implementation of AddHeaders (`verify` parameter
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// tells it to verify or not verify given headers).
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func (bc *Blockchain) addHeaders(verify bool, headers ...*block.Header) (err error) {
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var (
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start = time.Now()
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batch = bc.dao.Store.Batch()
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)
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if len(headers) > 0 {
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var i int
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curHeight := bc.HeaderHeight()
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for i = range headers {
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if headers[i].Index > curHeight {
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break
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}
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}
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headers = headers[i:]
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}
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if len(headers) == 0 {
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return nil
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} else if verify {
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// Verify that the chain of the headers is consistent.
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var lastHeader *block.Header
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if lastHeader, err = bc.GetHeader(headers[0].PrevHash); err != nil {
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return fmt.Errorf("previous header was not found: %v", err)
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}
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for _, h := range headers {
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if err = bc.verifyHeader(h, lastHeader); err != nil {
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return
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}
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lastHeader = h
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}
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}
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bc.headersOp <- func(headerList *HeaderHashList) {
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oldlen := headerList.Len()
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for _, h := range headers {
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if int(h.Index-1) >= headerList.Len() {
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err = fmt.Errorf(
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"height of received header %d is higher then the current header %d",
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h.Index, headerList.Len(),
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)
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return
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}
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if int(h.Index) < headerList.Len() {
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continue
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}
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if !h.Verify() {
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err = fmt.Errorf("header %v is invalid", h)
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return
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}
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if err = bc.processHeader(h, batch, headerList); err != nil {
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return
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}
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}
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|
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if oldlen != headerList.Len() {
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updateHeaderHeightMetric(headerList.Len() - 1)
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if err = bc.dao.Store.PutBatch(batch); err != nil {
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return
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}
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bc.log.Debug("done processing headers",
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zap.Int("headerIndex", headerList.Len()-1),
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zap.Uint32("blockHeight", bc.BlockHeight()),
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zap.Duration("took", time.Since(start)))
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}
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}
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<-bc.headersOpDone
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return err
|
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}
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|
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// processHeader processes the given header. Note that this is only thread safe
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// if executed in headers operation.
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func (bc *Blockchain) processHeader(h *block.Header, batch storage.Batch, headerList *HeaderHashList) error {
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headerList.Add(h.Hash())
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buf := io.NewBufBinWriter()
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for int(h.Index)-headerBatchCount >= int(bc.storedHeaderCount) {
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if err := headerList.Write(buf.BinWriter, int(bc.storedHeaderCount), headerBatchCount); err != nil {
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return err
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}
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key := storage.AppendPrefixInt(storage.IXHeaderHashList, int(bc.storedHeaderCount))
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batch.Put(key, buf.Bytes())
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bc.storedHeaderCount += headerBatchCount
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buf.Reset()
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}
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buf.Reset()
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buf.BinWriter.WriteU32LE(0) // sys fee is yet to be calculated
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h.EncodeBinary(buf.BinWriter)
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if buf.Err != nil {
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return buf.Err
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}
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|
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key := storage.AppendPrefix(storage.DataBlock, h.Hash().BytesLE())
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batch.Put(key, buf.Bytes())
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batch.Put(storage.SYSCurrentHeader.Bytes(), hashAndIndexToBytes(h.Hash(), h.Index))
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return nil
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}
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|
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// getSystemFeeAmount returns sum of all system fees for blocks up to h.
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// and 0 if no such block exists.
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func (bc *Blockchain) getSystemFeeAmount(h util.Uint256) uint32 {
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_, sf, _ := bc.dao.GetBlock(h)
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return sf
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}
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|
|
// TODO: storeBlock needs some more love, its implemented as in the original
|
|
// project. This for the sake of development speed and understanding of what
|
|
// is happening here, quite allot as you can see :). If things are wired together
|
|
// and all tests are in place, we can make a more optimized and cleaner implementation.
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|
func (bc *Blockchain) storeBlock(block *block.Block) error {
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cache := dao.NewCached(bc.dao)
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fee := bc.getSystemFeeAmount(block.PrevHash)
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for _, tx := range block.Transactions {
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fee += uint32(bc.SystemFee(tx).IntegralValue())
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}
|
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if err := cache.StoreAsBlock(block, fee); err != nil {
|
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return err
|
|
}
|
|
|
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if err := cache.StoreAsCurrentBlock(block); err != nil {
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return err
|
|
}
|
|
|
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for _, tx := range block.Transactions {
|
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if err := cache.StoreAsTransaction(tx, block.Index); err != nil {
|
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return err
|
|
}
|
|
|
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if err := cache.PutUnspentCoinState(tx.Hash(), state.NewUnspentCoin(block.Index, tx)); err != nil {
|
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return err
|
|
}
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|
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// Process TX outputs.
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if err := processOutputs(tx, cache); err != nil {
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return err
|
|
}
|
|
|
|
// Process TX inputs that are grouped by previous hash.
|
|
for _, inputs := range transaction.GroupInputsByPrevHash(tx.Inputs) {
|
|
prevHash := inputs[0].PrevHash
|
|
unspent, err := cache.GetUnspentCoinState(prevHash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, input := range inputs {
|
|
if len(unspent.States) <= int(input.PrevIndex) {
|
|
return fmt.Errorf("bad input: %s/%d", input.PrevHash.StringLE(), input.PrevIndex)
|
|
}
|
|
if unspent.States[input.PrevIndex].State&state.CoinSpent != 0 {
|
|
return fmt.Errorf("double spend: %s/%d", input.PrevHash.StringLE(), input.PrevIndex)
|
|
}
|
|
unspent.States[input.PrevIndex].State |= state.CoinSpent
|
|
unspent.States[input.PrevIndex].SpendHeight = block.Index
|
|
prevTXOutput := &unspent.States[input.PrevIndex].Output
|
|
account, err := cache.GetAccountStateOrNew(prevTXOutput.ScriptHash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if prevTXOutput.AssetID.Equals(GoverningTokenID()) {
|
|
err = account.Unclaimed.Put(&state.UnclaimedBalance{
|
|
Tx: input.PrevHash,
|
|
Index: input.PrevIndex,
|
|
Start: unspent.Height,
|
|
End: block.Index,
|
|
Value: prevTXOutput.Amount,
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err = processTXWithValidatorsSubtract(prevTXOutput, account, cache); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
balancesLen := len(account.Balances[prevTXOutput.AssetID])
|
|
if balancesLen <= 1 {
|
|
delete(account.Balances, prevTXOutput.AssetID)
|
|
} else {
|
|
var index = -1
|
|
for i, balance := range account.Balances[prevTXOutput.AssetID] {
|
|
if balance.Tx.Equals(input.PrevHash) && balance.Index == input.PrevIndex {
|
|
index = i
|
|
break
|
|
}
|
|
}
|
|
if index >= 0 {
|
|
last := balancesLen - 1
|
|
if last > index {
|
|
account.Balances[prevTXOutput.AssetID][index] = account.Balances[prevTXOutput.AssetID][last]
|
|
}
|
|
account.Balances[prevTXOutput.AssetID] = account.Balances[prevTXOutput.AssetID][:last]
|
|
}
|
|
}
|
|
if err = cache.PutAccountState(account); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if err = cache.PutUnspentCoinState(prevHash, unspent); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Process the underlying type of the TX.
|
|
switch t := tx.Data.(type) {
|
|
case *transaction.RegisterTX:
|
|
err := cache.PutAssetState(&state.Asset{
|
|
ID: tx.Hash(),
|
|
AssetType: t.AssetType,
|
|
Name: t.Name,
|
|
Amount: t.Amount,
|
|
Precision: t.Precision,
|
|
Owner: t.Owner,
|
|
Admin: t.Admin,
|
|
Expiration: bc.BlockHeight() + registeredAssetLifetime,
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case *transaction.IssueTX:
|
|
for _, res := range bc.GetTransactionResults(tx) {
|
|
if res.Amount < 0 {
|
|
asset, err := cache.GetAssetState(res.AssetID)
|
|
if asset == nil || err != nil {
|
|
return fmt.Errorf("issue failed: no asset %s or error %s", res.AssetID, err)
|
|
}
|
|
asset.Available -= res.Amount
|
|
if err := cache.PutAssetState(asset); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
case *transaction.ClaimTX:
|
|
// Remove claimed NEO from spent coins making it unavalaible for
|
|
// additional claims.
|
|
for _, input := range t.Claims {
|
|
scs, err := cache.GetUnspentCoinState(input.PrevHash)
|
|
if err == nil {
|
|
if len(scs.States) <= int(input.PrevIndex) {
|
|
err = errors.New("invalid claim index")
|
|
} else if scs.States[input.PrevIndex].State&state.CoinClaimed != 0 {
|
|
err = errors.New("double claim")
|
|
}
|
|
}
|
|
if err != nil {
|
|
// We can't really do anything about it
|
|
// as it's a transaction in a signed block.
|
|
bc.log.Warn("FALSE OR DOUBLE CLAIM",
|
|
zap.String("PrevHash", input.PrevHash.StringLE()),
|
|
zap.Uint16("PrevIndex", input.PrevIndex),
|
|
zap.String("tx", tx.Hash().StringLE()),
|
|
zap.Uint32("block", block.Index),
|
|
)
|
|
// "Strict" mode.
|
|
if bc.config.VerifyTransactions {
|
|
return err
|
|
}
|
|
break
|
|
}
|
|
|
|
acc, err := cache.GetAccountState(scs.States[input.PrevIndex].ScriptHash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
scs.States[input.PrevIndex].State |= state.CoinClaimed
|
|
if err = cache.PutUnspentCoinState(input.PrevHash, scs); err != nil {
|
|
return err
|
|
}
|
|
|
|
changed := acc.Unclaimed.Remove(input.PrevHash, input.PrevIndex)
|
|
if !changed {
|
|
bc.log.Warn("no spent coin in the account",
|
|
zap.String("tx", tx.Hash().StringLE()),
|
|
zap.String("input", input.PrevHash.StringLE()),
|
|
zap.String("account", acc.ScriptHash.String()))
|
|
} else if err := cache.PutAccountState(acc); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
case *transaction.EnrollmentTX:
|
|
if err := processEnrollmentTX(cache, t); err != nil {
|
|
return err
|
|
}
|
|
case *transaction.StateTX:
|
|
if err := bc.processStateTX(cache, tx, t); err != nil {
|
|
return err
|
|
}
|
|
case *transaction.InvocationTX:
|
|
systemInterop := bc.newInteropContext(trigger.Application, cache, block, tx)
|
|
v := SpawnVM(systemInterop)
|
|
v.SetCheckedHash(tx.VerificationHash().BytesBE())
|
|
v.LoadScript(t.Script)
|
|
v.SetPriceGetter(getPrice)
|
|
if bc.config.FreeGasLimit > 0 {
|
|
v.SetGasLimit(bc.config.FreeGasLimit + t.Gas)
|
|
}
|
|
|
|
err := v.Run()
|
|
if !v.HasFailed() {
|
|
_, err := systemInterop.DAO.Persist()
|
|
if err != nil {
|
|
return errors.Wrap(err, "failed to persist invocation results")
|
|
}
|
|
for _, note := range systemInterop.Notifications {
|
|
arr, ok := note.Item.Value().([]vm.StackItem)
|
|
if !ok || len(arr) != 4 {
|
|
continue
|
|
}
|
|
op, ok := arr[0].Value().([]byte)
|
|
if !ok || string(op) != "transfer" {
|
|
continue
|
|
}
|
|
from, ok := arr[1].Value().([]byte)
|
|
if !ok {
|
|
continue
|
|
}
|
|
to, ok := arr[2].Value().([]byte)
|
|
if !ok {
|
|
continue
|
|
}
|
|
amount, ok := arr[3].Value().(*big.Int)
|
|
if !ok {
|
|
bs, ok := arr[3].Value().([]byte)
|
|
if !ok {
|
|
continue
|
|
}
|
|
amount = emit.BytesToInt(bs)
|
|
}
|
|
bc.processNEP5Transfer(cache, tx, block, note.ScriptHash, from, to, amount.Int64())
|
|
}
|
|
} 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().ToContractParameters(),
|
|
Events: systemInterop.Notifications,
|
|
}
|
|
err = cache.PutAppExecResult(aer)
|
|
if err != nil {
|
|
return errors.Wrap(err, "failed to Store notifications")
|
|
}
|
|
}
|
|
}
|
|
bc.lock.Lock()
|
|
defer bc.lock.Unlock()
|
|
|
|
if bc.config.SaveStorageBatch {
|
|
bc.lastBatch = cache.DAO.GetBatch()
|
|
}
|
|
|
|
for i := range bc.contracts.Contracts {
|
|
systemInterop := bc.newInteropContext(trigger.Application, cache, block, nil)
|
|
if err := bc.contracts.Contracts[i].OnPersist(systemInterop); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
_, err := cache.Persist()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
bc.topBlock.Store(block)
|
|
atomic.StoreUint32(&bc.blockHeight, block.Index)
|
|
updateBlockHeightMetric(block.Index)
|
|
bc.memPool.RemoveStale(bc.isTxStillRelevant)
|
|
return nil
|
|
}
|
|
|
|
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, tx *transaction.Transaction, b *block.Block, sc util.Uint160, from, to []byte, amount int64) {
|
|
toAddr := parseUint160(to)
|
|
fromAddr := parseUint160(from)
|
|
transfer := &state.NEP5Transfer{
|
|
Asset: sc,
|
|
From: fromAddr,
|
|
To: toAddr,
|
|
Block: b.Index,
|
|
Timestamp: b.Timestamp,
|
|
Tx: tx.Hash(),
|
|
}
|
|
if !fromAddr.Equals(util.Uint160{}) {
|
|
balances, err := cache.GetNEP5Balances(fromAddr)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bs := balances.Trackers[sc]
|
|
bs.Balance -= amount
|
|
bs.LastUpdatedBlock = b.Index
|
|
balances.Trackers[sc] = bs
|
|
|
|
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[sc]
|
|
bs.Balance += amount
|
|
bs.LastUpdatedBlock = b.Index
|
|
balances.Trackers[sc] = 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
|
|
}
|
|
|
|
// LastBatch returns last persisted storage batch.
|
|
func (bc *Blockchain) LastBatch() *storage.MemBatch {
|
|
return bc.lastBatch
|
|
}
|
|
|
|
// RegisterNative registers native contract in the blockchain.
|
|
func (bc *Blockchain) RegisterNative(c native.Contract) {
|
|
bc.contracts.Add(c)
|
|
}
|
|
|
|
// processOutputs processes transaction outputs.
|
|
func processOutputs(tx *transaction.Transaction, dao *dao.Cached) error {
|
|
for index, output := range tx.Outputs {
|
|
account, err := dao.GetAccountStateOrNew(output.ScriptHash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
account.Balances[output.AssetID] = append(account.Balances[output.AssetID], state.UnspentBalance{
|
|
Tx: tx.Hash(),
|
|
Index: uint16(index),
|
|
Value: output.Amount,
|
|
})
|
|
if err = dao.PutAccountState(account); err != nil {
|
|
return err
|
|
}
|
|
if err = processTXWithValidatorsAdd(&output, account, dao); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func processTXWithValidatorsAdd(output *transaction.Output, account *state.Account, dao *dao.Cached) error {
|
|
if output.AssetID.Equals(GoverningTokenID()) && len(account.Votes) > 0 {
|
|
return modAccountVotes(account, dao, output.Amount)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func processTXWithValidatorsSubtract(output *transaction.Output, account *state.Account, dao *dao.Cached) error {
|
|
if output.AssetID.Equals(GoverningTokenID()) && len(account.Votes) > 0 {
|
|
return modAccountVotes(account, dao, -output.Amount)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// modAccountVotes adds given value to given account voted validators.
|
|
func modAccountVotes(account *state.Account, dao *dao.Cached, value util.Fixed8) error {
|
|
if err := native.ModifyAccountVotes(account, dao, value); err != nil {
|
|
return err
|
|
}
|
|
if len(account.Votes) > 0 {
|
|
vc, err := dao.GetValidatorsCount()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
vc[len(account.Votes)-1] += value
|
|
err = dao.PutValidatorsCount(vc)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func processValidatorStateDescriptor(descriptor *transaction.StateDescriptor, dao *dao.Cached) error {
|
|
publicKey := &keys.PublicKey{}
|
|
err := publicKey.DecodeBytes(descriptor.Key)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
validatorState, err := dao.GetValidatorStateOrNew(publicKey)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if descriptor.Field == "Registered" {
|
|
if len(descriptor.Value) == 1 {
|
|
validatorState.Registered = descriptor.Value[0] != 0
|
|
return dao.PutValidatorState(validatorState)
|
|
}
|
|
return errors.New("bad descriptor value")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (bc *Blockchain) processAccountStateDescriptor(descriptor *transaction.StateDescriptor, t *transaction.Transaction, dao *dao.Cached) error {
|
|
hash, err := util.Uint160DecodeBytesBE(descriptor.Key)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if descriptor.Field == "Votes" {
|
|
votes := keys.PublicKeys{}
|
|
if err := votes.DecodeBytes(descriptor.Value); err != nil {
|
|
return err
|
|
}
|
|
ic := bc.newInteropContext(trigger.Application, dao, nil, t)
|
|
return bc.contracts.NEO.VoteInternal(ic, hash, votes)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// 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(scripthash util.Uint160, key []byte) *state.StorageItem {
|
|
return bc.dao.GetStorageItem(scripthash, key)
|
|
}
|
|
|
|
// GetStorageItems returns all storage items for a given scripthash.
|
|
func (bc *Blockchain) GetStorageItems(hash util.Uint160) (map[string]*state.StorageItem, error) {
|
|
return bc.dao.GetStorageItems(hash)
|
|
}
|
|
|
|
// 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
|
|
}
|
|
if len(block.Transactions) == 0 {
|
|
return nil, fmt.Errorf("only header is available")
|
|
}
|
|
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)
|
|
}
|
|
|
|
// GetAssetState returns asset state from its assetID.
|
|
func (bc *Blockchain) GetAssetState(assetID util.Uint256) *state.Asset {
|
|
asset, err := bc.dao.GetAssetState(assetID)
|
|
if asset == nil && err != storage.ErrKeyNotFound {
|
|
bc.log.Warn("failed to get asset state",
|
|
zap.Stringer("asset", assetID),
|
|
zap.Error(err))
|
|
}
|
|
return asset
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
// GetUnspentCoinState returns unspent coin state for given tx hash.
|
|
func (bc *Blockchain) GetUnspentCoinState(hash util.Uint256) *state.UnspentCoin {
|
|
ucs, err := bc.dao.GetUnspentCoinState(hash)
|
|
if ucs == nil && err != storage.ErrKeyNotFound {
|
|
bc.log.Warn("failed to get unspent coin state", zap.Error(err))
|
|
}
|
|
return ucs
|
|
}
|
|
|
|
// GetConfig returns the config stored in the blockchain.
|
|
func (bc *Blockchain) GetConfig() config.ProtocolConfiguration {
|
|
return bc.config
|
|
}
|
|
|
|
// CalculateClaimable calculates the amount of GAS which can be claimed for a transaction with value.
|
|
// First return value is GAS generated between startHeight and endHeight.
|
|
// Second return value is GAS returned from accumulated SystemFees between startHeight and endHeight.
|
|
func (bc *Blockchain) CalculateClaimable(value util.Fixed8, startHeight, endHeight uint32) (util.Fixed8, util.Fixed8, error) {
|
|
var amount util.Fixed8
|
|
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 += util.Fixed8(di-istart) * util.Fixed8(bc.generationAmount[ustart])
|
|
ustart++
|
|
istart = 0
|
|
}
|
|
|
|
amount += util.Fixed8(iend-istart) * util.Fixed8(bc.generationAmount[ustart])
|
|
}
|
|
|
|
if startHeight == 0 {
|
|
startHeight++
|
|
}
|
|
h := bc.GetHeaderHash(int(startHeight - 1))
|
|
feeStart := bc.getSystemFeeAmount(h)
|
|
h = bc.GetHeaderHash(int(endHeight - 1))
|
|
feeEnd := bc.getSystemFeeAmount(h)
|
|
|
|
sysFeeTotal := util.Fixed8(feeEnd - feeStart)
|
|
ratio := value / 100000000
|
|
return amount * ratio, sysFeeTotal * ratio, nil
|
|
}
|
|
|
|
// References maps transaction's inputs into a slice of InOuts, effectively
|
|
// joining each Input with the corresponding Output.
|
|
// @TODO: unfortunately we couldn't attach this method to the Transaction struct in the
|
|
// transaction package because of a import cycle problem. Perhaps we should think to re-design
|
|
// the code base to avoid this situation.
|
|
func (bc *Blockchain) References(t *transaction.Transaction) ([]transaction.InOut, error) {
|
|
return bc.references(t.Inputs)
|
|
}
|
|
|
|
// references is an internal implementation of References that operates directly
|
|
// on a slice of Input.
|
|
func (bc *Blockchain) references(ins []transaction.Input) ([]transaction.InOut, error) {
|
|
references := make([]transaction.InOut, 0, len(ins))
|
|
|
|
for _, inputs := range transaction.GroupInputsByPrevHash(ins) {
|
|
prevHash := inputs[0].PrevHash
|
|
unspent, err := bc.dao.GetUnspentCoinState(prevHash)
|
|
if err != nil {
|
|
return nil, errors.New("bad input reference")
|
|
}
|
|
for _, in := range inputs {
|
|
if int(in.PrevIndex) > len(unspent.States)-1 {
|
|
return nil, errors.New("bad input reference")
|
|
}
|
|
references = append(references, transaction.InOut{In: *in, Out: unspent.States[in.PrevIndex].Output})
|
|
}
|
|
}
|
|
return references, nil
|
|
}
|
|
|
|
// FeePerByte returns network fee divided by the size of the transaction.
|
|
func (bc *Blockchain) FeePerByte(t *transaction.Transaction) util.Fixed8 {
|
|
return bc.NetworkFee(t).Div(int64(io.GetVarSize(t)))
|
|
}
|
|
|
|
// NetworkFee returns network fee.
|
|
func (bc *Blockchain) NetworkFee(t *transaction.Transaction) util.Fixed8 {
|
|
// https://github.com/neo-project/neo/blob/master-2.x/neo/Network/P2P/Payloads/ClaimTransaction.cs#L16
|
|
if t.Type == transaction.ClaimType || t.Type == transaction.MinerType {
|
|
return 0
|
|
}
|
|
|
|
inputAmount := util.Fixed8FromInt64(0)
|
|
refs, err := bc.References(t)
|
|
if err != nil {
|
|
return inputAmount
|
|
}
|
|
for i := range refs {
|
|
if refs[i].Out.AssetID == UtilityTokenID() {
|
|
inputAmount = inputAmount.Add(refs[i].Out.Amount)
|
|
}
|
|
}
|
|
|
|
outputAmount := util.Fixed8FromInt64(0)
|
|
for _, txOutput := range t.Outputs {
|
|
if txOutput.AssetID == UtilityTokenID() {
|
|
outputAmount = outputAmount.Add(txOutput.Amount)
|
|
}
|
|
}
|
|
|
|
return inputAmount.Sub(outputAmount).Sub(bc.SystemFee(t))
|
|
}
|
|
|
|
// SystemFee returns system fee.
|
|
func (bc *Blockchain) SystemFee(t *transaction.Transaction) util.Fixed8 {
|
|
if t.Type == transaction.InvocationType {
|
|
inv := t.Data.(*transaction.InvocationTX)
|
|
if inv.Version >= 1 {
|
|
return inv.Gas
|
|
}
|
|
}
|
|
return bc.GetConfig().SystemFee.TryGetValue(t.Type)
|
|
}
|
|
|
|
// IsLowPriority checks given fee for being less than configured
|
|
// LowPriorityThreshold.
|
|
func (bc *Blockchain) IsLowPriority(fee util.Fixed8) bool {
|
|
return fee < util.Fixed8FromFloat(bc.GetConfig().LowPriorityThreshold)
|
|
}
|
|
|
|
// 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 []mempool.TxWithFee) []mempool.TxWithFee {
|
|
if bc.config.MaxTransactionsPerBlock != 0 && len(txes) > bc.config.MaxTransactionsPerBlock {
|
|
txes = txes[:bc.config.MaxTransactionsPerBlock]
|
|
}
|
|
maxFree := bc.config.MaxFreeTransactionsPerBlock
|
|
if maxFree != 0 {
|
|
lowStart := sort.Search(len(txes), func(i int) bool {
|
|
return bc.IsLowPriority(txes[i].Fee)
|
|
})
|
|
if lowStart+maxFree < len(txes) {
|
|
txes = txes[:lowStart+maxFree]
|
|
}
|
|
}
|
|
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 errors.Errorf("transaction has expired. ValidUntilBlock = %d, current height = %d", t.ValidUntilBlock, height)
|
|
}
|
|
if io.GetVarSize(t) > transaction.MaxTransactionSize {
|
|
return errors.Errorf("invalid transaction size = %d. It shoud be less then MaxTransactionSize = %d", io.GetVarSize(t), transaction.MaxTransactionSize)
|
|
}
|
|
if transaction.HaveDuplicateInputs(t.Inputs) {
|
|
return errors.New("invalid transaction's inputs")
|
|
}
|
|
if block == nil {
|
|
if ok := bc.memPool.Verify(t); !ok {
|
|
return errors.New("invalid transaction due to conflicts with the memory pool")
|
|
}
|
|
}
|
|
if bc.dao.IsDoubleSpend(t) {
|
|
return errors.New("invalid transaction caused by double spending")
|
|
}
|
|
if err := bc.verifyOutputs(t); err != nil {
|
|
return errors.Wrap(err, "wrong outputs")
|
|
}
|
|
refs, err := bc.References(t)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
results := refsAndOutsToResults(refs, t.Outputs)
|
|
if err := bc.verifyResults(t, results); err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, a := range t.Attributes {
|
|
if a.Usage == transaction.ECDH02 || a.Usage == transaction.ECDH03 {
|
|
return errors.Errorf("invalid attribute's usage = %s ", a.Usage)
|
|
}
|
|
}
|
|
|
|
switch t.Type {
|
|
case transaction.ClaimType:
|
|
claim := t.Data.(*transaction.ClaimTX)
|
|
if transaction.HaveDuplicateInputs(claim.Claims) {
|
|
return errors.New("duplicate claims")
|
|
}
|
|
if bc.dao.IsDoubleClaim(claim) {
|
|
return errors.New("double claim")
|
|
}
|
|
if err := bc.verifyClaims(t, results); err != nil {
|
|
return err
|
|
}
|
|
case transaction.InvocationType:
|
|
inv := t.Data.(*transaction.InvocationTX)
|
|
if inv.Gas.FractionalValue() != 0 {
|
|
return errors.New("invocation gas can only be integer")
|
|
}
|
|
case transaction.StateType:
|
|
stx := t.Data.(*transaction.StateTX)
|
|
for _, desc := range stx.Descriptors {
|
|
switch desc.Type {
|
|
case transaction.Account:
|
|
if desc.Field != "Votes" {
|
|
return errors.New("bad field in account descriptor")
|
|
}
|
|
votes := keys.PublicKeys{}
|
|
err := votes.DecodeBytes(desc.Value)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(votes) > state.MaxValidatorsVoted {
|
|
return errors.New("voting candidate limit exceeded")
|
|
}
|
|
hash, err := util.Uint160DecodeBytesBE(desc.Key)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
account, err := bc.dao.GetAccountStateOrNew(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if account.IsFrozen {
|
|
return errors.New("account is frozen")
|
|
}
|
|
if votes.Len() > 0 {
|
|
balance := account.GetBalanceValues()[GoverningTokenID()]
|
|
if balance == 0 {
|
|
return errors.New("no governing tokens available to vote")
|
|
}
|
|
validators, err := bc.GetEnrollments()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, k := range votes {
|
|
var isRegistered bool
|
|
for i := range validators {
|
|
if k.Equal(validators[i].PublicKey) {
|
|
isRegistered = true
|
|
break
|
|
}
|
|
}
|
|
if !isRegistered {
|
|
return errors.New("vote for unregistered validator")
|
|
}
|
|
}
|
|
}
|
|
case transaction.Validator:
|
|
if desc.Field != "Registered" {
|
|
return errors.New("bad field in validator descriptor")
|
|
}
|
|
default:
|
|
return errors.New("bad descriptor type")
|
|
}
|
|
}
|
|
}
|
|
|
|
return bc.verifyTxWitnesses(t, block)
|
|
}
|
|
|
|
func (bc *Blockchain) verifyClaims(tx *transaction.Transaction, results []*transaction.Result) (err error) {
|
|
t := tx.Data.(*transaction.ClaimTX)
|
|
var result *transaction.Result
|
|
for i := range results {
|
|
if results[i].AssetID == UtilityTokenID() {
|
|
result = results[i]
|
|
break
|
|
}
|
|
}
|
|
|
|
if result == nil || result.Amount.GreaterThan(0) {
|
|
return errors.New("invalid output in claim tx")
|
|
}
|
|
|
|
bonus, err := bc.calculateBonus(t.Claims)
|
|
if err == nil && bonus != -result.Amount {
|
|
return fmt.Errorf("wrong bonus calculated in claim tx: %s != %s",
|
|
bonus.String(), (-result.Amount).String())
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
func (bc *Blockchain) calculateBonus(claims []transaction.Input) (util.Fixed8, error) {
|
|
unclaimed := []*spentCoin{}
|
|
inputs := transaction.GroupInputsByPrevHash(claims)
|
|
|
|
for _, group := range inputs {
|
|
h := group[0].PrevHash
|
|
unspent, err := bc.dao.GetUnspentCoinState(h)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
for _, c := range group {
|
|
if len(unspent.States) <= int(c.PrevIndex) {
|
|
return 0, fmt.Errorf("can't find spent coins for %s (%d)", c.PrevHash.StringLE(), c.PrevIndex)
|
|
}
|
|
if unspent.States[c.PrevIndex].State&state.CoinSpent == 0 {
|
|
return 0, fmt.Errorf("not spent yet: %s/%d", c.PrevHash.StringLE(), c.PrevIndex)
|
|
}
|
|
if unspent.States[c.PrevIndex].State&state.CoinClaimed != 0 {
|
|
return 0, fmt.Errorf("already claimed: %s/%d", c.PrevHash.StringLE(), c.PrevIndex)
|
|
}
|
|
unclaimed = append(unclaimed, &spentCoin{
|
|
Output: &unspent.States[c.PrevIndex].Output,
|
|
StartHeight: unspent.Height,
|
|
EndHeight: unspent.States[c.PrevIndex].SpendHeight,
|
|
})
|
|
}
|
|
}
|
|
|
|
return bc.calculateBonusInternal(unclaimed)
|
|
}
|
|
|
|
func (bc *Blockchain) calculateBonusInternal(scs []*spentCoin) (util.Fixed8, error) {
|
|
var claimed util.Fixed8
|
|
for _, sc := range scs {
|
|
gen, sys, err := bc.CalculateClaimable(sc.Output.Amount, sc.StartHeight, sc.EndHeight)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
claimed += gen + sys
|
|
}
|
|
|
|
return claimed, nil
|
|
}
|
|
|
|
// 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
|
|
}
|
|
if bc.dao.IsDoubleSpend(t) {
|
|
return false
|
|
}
|
|
if t.Type == transaction.ClaimType {
|
|
claim := t.Data.(*transaction.ClaimTX)
|
|
if bc.dao.IsDoubleClaim(claim) {
|
|
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
|
|
|
|
}
|
|
|
|
// 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 ErrAlreadyExists
|
|
}
|
|
if err := bc.verifyTx(t, nil); err != nil {
|
|
return err
|
|
}
|
|
// Policying.
|
|
if t.Type != transaction.ClaimType {
|
|
txSize := io.GetVarSize(t)
|
|
maxFree := bc.config.MaxFreeTransactionSize
|
|
if maxFree != 0 && txSize > maxFree {
|
|
netFee := bc.NetworkFee(t)
|
|
if bc.IsLowPriority(netFee) ||
|
|
netFee < util.Fixed8FromFloat(bc.config.FeePerExtraByte)*util.Fixed8(txSize-maxFree) {
|
|
return ErrPolicy
|
|
}
|
|
}
|
|
}
|
|
if err := bc.memPool.Add(t, bc); err != nil {
|
|
switch err {
|
|
case mempool.ErrOOM:
|
|
return ErrOOM
|
|
case mempool.ErrConflict:
|
|
return ErrAlreadyExists
|
|
default:
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (bc *Blockchain) verifyOutputs(t *transaction.Transaction) error {
|
|
for assetID, outputs := range t.GroupOutputByAssetID() {
|
|
assetState := bc.GetAssetState(assetID)
|
|
if assetState == nil {
|
|
return fmt.Errorf("no asset state for %s", assetID.StringLE())
|
|
}
|
|
|
|
if assetState.Expiration < bc.blockHeight+1 && assetState.AssetType != transaction.GoverningToken && assetState.AssetType != transaction.UtilityToken {
|
|
return fmt.Errorf("asset %s expired", assetID.StringLE())
|
|
}
|
|
|
|
for _, out := range outputs {
|
|
if int64(out.Amount)%int64(math.Pow10(8-int(assetState.Precision))) != 0 {
|
|
return fmt.Errorf("output is not compliant with %s asset precision", assetID.StringLE())
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (bc *Blockchain) verifyResults(t *transaction.Transaction, results []*transaction.Result) error {
|
|
var resultsDestroy []*transaction.Result
|
|
var resultsIssue []*transaction.Result
|
|
for _, re := range results {
|
|
if re.Amount.GreaterThan(util.Fixed8(0)) {
|
|
resultsDestroy = append(resultsDestroy, re)
|
|
}
|
|
|
|
if re.Amount.LessThan(util.Fixed8(0)) {
|
|
resultsIssue = append(resultsIssue, re)
|
|
}
|
|
}
|
|
if len(resultsDestroy) > 1 {
|
|
return errors.New("tx has more than 1 destroy output")
|
|
}
|
|
if len(resultsDestroy) == 1 && resultsDestroy[0].AssetID != UtilityTokenID() {
|
|
return errors.New("tx destroys non-utility token")
|
|
}
|
|
sysfee := bc.SystemFee(t)
|
|
if sysfee.GreaterThan(util.Fixed8(0)) {
|
|
if len(resultsDestroy) == 0 {
|
|
return fmt.Errorf("system requires to pay %s fee, but tx pays nothing", sysfee.String())
|
|
}
|
|
if resultsDestroy[0].Amount.LessThan(sysfee) {
|
|
return fmt.Errorf("system requires to pay %s fee, but tx pays %s only", sysfee.String(), resultsDestroy[0].Amount.String())
|
|
}
|
|
}
|
|
|
|
switch t.Type {
|
|
case transaction.MinerType, transaction.ClaimType:
|
|
for _, r := range resultsIssue {
|
|
if r.AssetID != UtilityTokenID() {
|
|
return errors.New("miner or claim tx issues non-utility tokens")
|
|
}
|
|
}
|
|
break
|
|
case transaction.IssueType:
|
|
for _, r := range resultsIssue {
|
|
if r.AssetID == UtilityTokenID() {
|
|
return errors.New("issue tx issues utility tokens")
|
|
}
|
|
asset, err := bc.dao.GetAssetState(r.AssetID)
|
|
if asset == nil || err != nil {
|
|
return errors.New("invalid asset in issue tx")
|
|
}
|
|
if asset.Available < r.Amount {
|
|
return errors.New("trying to issue more than available")
|
|
}
|
|
}
|
|
break
|
|
default:
|
|
if len(resultsIssue) > 0 {
|
|
return errors.New("non issue/miner/claim tx issues tokens")
|
|
}
|
|
break
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// GetTransactionResults returns the transaction results aggregate by assetID.
|
|
// Golang of GetTransationResults method in C# (https://github.com/neo-project/neo/blob/master/neo/Network/P2P/Payloads/Transaction.cs#L207)
|
|
func (bc *Blockchain) GetTransactionResults(t *transaction.Transaction) []*transaction.Result {
|
|
references, err := bc.References(t)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return refsAndOutsToResults(references, t.Outputs)
|
|
}
|
|
|
|
// mapReferencesToResults returns cumulative results of transaction based in its
|
|
// references and outputs.
|
|
func refsAndOutsToResults(references []transaction.InOut, outputs []transaction.Output) []*transaction.Result {
|
|
var results []*transaction.Result
|
|
tempResult := make(map[util.Uint256]util.Fixed8)
|
|
|
|
for _, inout := range references {
|
|
c := tempResult[inout.Out.AssetID]
|
|
tempResult[inout.Out.AssetID] = c.Add(inout.Out.Amount)
|
|
}
|
|
for _, output := range outputs {
|
|
c := tempResult[output.AssetID]
|
|
tempResult[output.AssetID] = c.Sub(output.Amount)
|
|
}
|
|
|
|
results = []*transaction.Result{} // this assignment is necessary. (Most of the time amount == 0 and results is the empty slice.)
|
|
for assetID, amount := range tempResult {
|
|
if amount != util.Fixed8(0) {
|
|
results = append(results, &transaction.Result{
|
|
AssetID: assetID,
|
|
Amount: amount,
|
|
})
|
|
}
|
|
}
|
|
|
|
return results
|
|
}
|
|
|
|
//GetStandByValidators returns validators from the configuration.
|
|
func (bc *Blockchain) GetStandByValidators() (keys.PublicKeys, error) {
|
|
return getValidators(bc.config)
|
|
}
|
|
|
|
// GetValidators returns validators.
|
|
// Golang implementation of GetValidators method in C# (https://github.com/neo-project/neo/blob/c64748ecbac3baeb8045b16af0d518398a6ced24/neo/Persistence/Snapshot.cs#L182)
|
|
func (bc *Blockchain) GetValidators(txes ...*transaction.Transaction) ([]*keys.PublicKey, error) {
|
|
cache := dao.NewCached(bc.dao)
|
|
if len(txes) > 0 {
|
|
for _, tx := range txes {
|
|
// iterate through outputs
|
|
for index, output := range tx.Outputs {
|
|
accountState, err := cache.GetAccountStateOrNew(output.ScriptHash)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
accountState.Balances[output.AssetID] = append(accountState.Balances[output.AssetID], state.UnspentBalance{
|
|
Tx: tx.Hash(),
|
|
Index: uint16(index),
|
|
Value: output.Amount,
|
|
})
|
|
if err := cache.PutAccountState(accountState); err != nil {
|
|
return nil, err
|
|
}
|
|
if err = processTXWithValidatorsAdd(&output, accountState, cache); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
// group inputs by the same previous hash and iterate through inputs
|
|
group := make(map[util.Uint256][]*transaction.Input)
|
|
for i := range tx.Inputs {
|
|
hash := tx.Inputs[i].PrevHash
|
|
group[hash] = append(group[hash], &tx.Inputs[i])
|
|
}
|
|
|
|
for hash, inputs := range group {
|
|
unspent, err := cache.GetUnspentCoinState(hash)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// process inputs
|
|
for _, input := range inputs {
|
|
prevOutput := &unspent.States[input.PrevIndex].Output
|
|
accountState, err := cache.GetAccountStateOrNew(prevOutput.ScriptHash)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// process account state votes: if there are any -> validators will be updated.
|
|
if err = processTXWithValidatorsSubtract(prevOutput, accountState, cache); err != nil {
|
|
return nil, err
|
|
}
|
|
delete(accountState.Balances, prevOutput.AssetID)
|
|
if err = cache.PutAccountState(accountState); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
|
|
switch t := tx.Data.(type) {
|
|
case *transaction.EnrollmentTX:
|
|
if err := processEnrollmentTX(cache, t); err != nil {
|
|
return nil, err
|
|
}
|
|
case *transaction.StateTX:
|
|
if err := bc.processStateTX(cache, tx, t); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return bc.contracts.NEO.GetValidatorsInternal(bc, cache)
|
|
}
|
|
|
|
// GetEnrollments returns all registered validators and non-registered SB validators
|
|
func (bc *Blockchain) GetEnrollments() ([]*state.Validator, error) {
|
|
validators := bc.dao.GetValidators()
|
|
standByValidators, err := bc.GetStandByValidators()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
uniqueSBValidators := standByValidators.Unique()
|
|
|
|
var result []*state.Validator
|
|
for _, validator := range validators {
|
|
if validator.Registered {
|
|
result = append(result, validator)
|
|
}
|
|
}
|
|
for _, sBValidator := range uniqueSBValidators {
|
|
isAdded := false
|
|
for _, v := range result {
|
|
if v.PublicKey == sBValidator {
|
|
isAdded = true
|
|
break
|
|
}
|
|
}
|
|
if !isAdded {
|
|
result = append(result, &state.Validator{
|
|
PublicKey: sBValidator,
|
|
Registered: false,
|
|
Votes: 0,
|
|
})
|
|
}
|
|
}
|
|
return result, nil
|
|
}
|
|
|
|
func (bc *Blockchain) processStateTX(dao *dao.Cached, t *transaction.Transaction, tx *transaction.StateTX) error {
|
|
for _, desc := range tx.Descriptors {
|
|
switch desc.Type {
|
|
case transaction.Account:
|
|
if err := bc.processAccountStateDescriptor(desc, t, dao); err != nil {
|
|
return err
|
|
}
|
|
case transaction.Validator:
|
|
if err := processValidatorStateDescriptor(desc, dao); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func processEnrollmentTX(dao *dao.Cached, tx *transaction.EnrollmentTX) error {
|
|
validatorState, err := dao.GetValidatorStateOrNew(&tx.PublicKey)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
validatorState.Registered = true
|
|
return dao.PutValidatorState(validatorState)
|
|
}
|
|
|
|
// GetScriptHashesForVerifying returns all the ScriptHashes of a transaction which will be use
|
|
// to verify whether the transaction is bonafide or not.
|
|
// Golang implementation of GetScriptHashesForVerifying method in C# (https://github.com/neo-project/neo/blob/master/neo/Network/P2P/Payloads/Transaction.cs#L190)
|
|
func (bc *Blockchain) GetScriptHashesForVerifying(t *transaction.Transaction) ([]util.Uint160, error) {
|
|
references, err := bc.References(t)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
hashes := make(map[util.Uint160]bool)
|
|
for i := range references {
|
|
hashes[references[i].Out.ScriptHash] = true
|
|
}
|
|
for _, a := range t.Attributes {
|
|
if a.Usage == transaction.Script {
|
|
h, err := util.Uint160DecodeBytesBE(a.Data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if _, ok := hashes[h]; !ok {
|
|
hashes[h] = true
|
|
}
|
|
}
|
|
}
|
|
|
|
for a, outputs := range t.GroupOutputByAssetID() {
|
|
as := bc.GetAssetState(a)
|
|
if as == nil {
|
|
return nil, errors.New("Invalid operation")
|
|
}
|
|
if as.AssetType&transaction.DutyFlag != 0 {
|
|
for _, o := range outputs {
|
|
h := o.ScriptHash
|
|
if _, ok := hashes[h]; !ok {
|
|
hashes[h] = true
|
|
}
|
|
}
|
|
}
|
|
}
|
|
switch t.Type {
|
|
case transaction.ClaimType:
|
|
claim := t.Data.(*transaction.ClaimTX)
|
|
refs, err := bc.references(claim.Claims)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for i := range refs {
|
|
hashes[refs[i].Out.ScriptHash] = true
|
|
}
|
|
case transaction.EnrollmentType:
|
|
etx := t.Data.(*transaction.EnrollmentTX)
|
|
hashes[etx.PublicKey.GetScriptHash()] = true
|
|
case transaction.IssueType:
|
|
for _, res := range refsAndOutsToResults(references, t.Outputs) {
|
|
if res.Amount < 0 {
|
|
asset, err := bc.dao.GetAssetState(res.AssetID)
|
|
if asset == nil || err != nil {
|
|
return nil, errors.New("invalid asset in issue tx")
|
|
}
|
|
hashes[asset.Issuer] = true
|
|
}
|
|
}
|
|
case transaction.RegisterType:
|
|
reg := t.Data.(*transaction.RegisterTX)
|
|
hashes[reg.Owner.GetScriptHash()] = true
|
|
case transaction.StateType:
|
|
stx := t.Data.(*transaction.StateTX)
|
|
for _, desc := range stx.Descriptors {
|
|
switch desc.Type {
|
|
case transaction.Account:
|
|
if desc.Field != "Votes" {
|
|
return nil, errors.New("bad account state descriptor")
|
|
}
|
|
hash, err := util.Uint160DecodeBytesBE(desc.Key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
hashes[hash] = true
|
|
case transaction.Validator:
|
|
if desc.Field != "Registered" {
|
|
return nil, errors.New("bad validator state descriptor")
|
|
}
|
|
key := &keys.PublicKey{}
|
|
err := key.DecodeBytes(desc.Key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
hashes[key.GetScriptHash()] = true
|
|
}
|
|
}
|
|
}
|
|
// convert hashes to []util.Uint160
|
|
hashesResult := make([]util.Uint160, 0, len(hashes))
|
|
for h := range hashes {
|
|
hashesResult = append(hashesResult, h)
|
|
}
|
|
|
|
return hashesResult, nil
|
|
|
|
}
|
|
|
|
// GetTestVM returns a VM and a Store setup for a test run of some sort of code.
|
|
func (bc *Blockchain) GetTestVM() *vm.VM {
|
|
systemInterop := bc.newInteropContext(trigger.Application, bc.dao, nil, nil)
|
|
vm := SpawnVM(systemInterop)
|
|
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, false)
|
|
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, checkedHash util.Uint256, interopCtx *interop.Context, useKeys bool) error {
|
|
verification, err := ScriptFromWitness(hash, witness)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
vm := SpawnVM(interopCtx)
|
|
vm.SetCheckedHash(checkedHash.BytesBE())
|
|
vm.LoadScript(verification)
|
|
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 errors.Errorf("vm failed to execute the script with error: %s", err)
|
|
}
|
|
resEl := vm.Estack().Pop()
|
|
if resEl != nil {
|
|
res, err := resEl.TryBool()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !res {
|
|
return errors.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 errors.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).
|
|
// Unfortunately the IVerifiable interface could not be implemented because we can't move the References method in blockchain.go to the transaction.go file.
|
|
func (bc *Blockchain) verifyTxWitnesses(t *transaction.Transaction, block *block.Block) error {
|
|
hashes, err := bc.GetScriptHashesForVerifying(t)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
witnesses := t.Scripts
|
|
if len(hashes) != len(witnesses) {
|
|
return errors.Errorf("expected len(hashes) == len(witnesses). got: %d != %d", len(hashes), len(witnesses))
|
|
}
|
|
sort.Slice(hashes, func(i, j int) bool { return hashes[i].Less(hashes[j]) })
|
|
sort.Slice(witnesses, func(i, j int) bool { return witnesses[i].ScriptHash().Less(witnesses[j].ScriptHash()) })
|
|
interopCtx := bc.newInteropContext(trigger.Verification, bc.dao, block, t)
|
|
for i := 0; i < len(hashes); i++ {
|
|
err := bc.verifyHashAgainstScript(hashes[i], &witnesses[i], t.VerificationHash(), interopCtx, false)
|
|
if err != nil {
|
|
numStr := fmt.Sprintf("witness #%d", i)
|
|
return errors.Wrap(err, numStr)
|
|
}
|
|
}
|
|
|
|
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)
|
|
return bc.verifyHashAgainstScript(hash, &currHeader.Script, currHeader.VerificationHash(), interopCtx, true)
|
|
}
|
|
|
|
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, block, tx, bc.log)
|
|
switch {
|
|
case tx != nil:
|
|
ic.Container = tx
|
|
case block != nil:
|
|
ic.Container = block
|
|
}
|
|
return ic
|
|
}
|