core

package
v0.91.1-pre Latest Latest
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 Go to latest Published: Aug 18, 2020 License: MIT Imports: 44 Imported by: 3

Documentation

Overview

Package core implements Neo ledger functionality. It's built around the Blockchain structure that maintains state of the ledger.

Events

You can subscribe to Blockchain events using a set of Subscribe and Unsubscribe methods. These methods accept channels that will be used to send appropriate events, so you can control buffering. Channels are never closed by Blockchain, you can close them after unsubscription.

Unlike RPC-level subscriptions these don't allow event filtering because it doesn't improve overall efficiency much (when you're using Blockchain you're in the same process with it and filtering on your side is not that different from filtering on Blockchain side).

The same level of ordering guarantees as with RPC subscriptions is provided, albeit for a set of event channels, so at first transaction execution is announced via appropriate channels, then followed by notifications generated during this execution, then followed by transaction announcement and then followed by block announcement. Transaction announcements are ordered the same way they're stored in the block.

Be careful using these subscriptions, this mechanism is not intended to be used by lots of subscribers and failing to read from event channels can affect other Blockchain operations.

Index

Constants

View Source 
const (
	// MaxContractDescriptionLen is the maximum length for contract description.
	MaxContractDescriptionLen = 65536
	// MaxContractScriptSize is the maximum script size for a contract.
	MaxContractScriptSize = 1024 * 1024
	// MaxContractParametersNum is the maximum number of parameters for a contract.
	MaxContractParametersNum = 252
	// MaxContractStringLen is the maximum length for contract metadata strings.
	MaxContractStringLen = 252
)
View Source 
const (
	// MaxStorageKeyLen is the maximum length of a key for storage items.
	MaxStorageKeyLen = 64
	// MaxStorageValueLen is the maximum length of a value for storage items.
	// It is set to be the maximum value for uint16.
	MaxStorageValueLen = 65535
	// MaxTraceableBlocks is the maximum number of blocks before current chain
	// height we're able to give information about.
	MaxTraceableBlocks = transaction.MaxValidUntilBlockIncrement
	// MaxEventNameLen is the maximum length of a name for event.
	MaxEventNameLen = 32
	// MaxNotificationSize is the maximum length of a runtime log message.
	MaxNotificationSize = 1024
)
View Source 
const StoragePrice = 100000

StoragePrice is a price for storing 1 byte of storage.

Variables

View Source 
var (
	// ErrAlreadyExists is returned when trying to add some already existing
	// transaction into the pool (not specifying whether it exists in the
	// chain or mempool).
	ErrAlreadyExists = errors.New("already exists")
	// ErrOOM is returned when adding transaction to the memory pool because
	// it reached its full capacity.
	ErrOOM = errors.New("no space left in the memory pool")
	// ErrPolicy is returned on attempt to add transaction that doesn't
	// comply with node's configured policy into the mempool.
	ErrPolicy = errors.New("not allowed by policy")
	// ErrInvalidBlockIndex is returned when trying to add block with index
	// other than expected height of the blockchain.
	ErrInvalidBlockIndex error = errors.New("invalid block index")
)
View Source 
var (
	ErrHdrHashMismatch     = errors.New("previous header hash doesn't match")
	ErrHdrIndexMismatch    = errors.New("previous header index doesn't match")
	ErrHdrInvalidTimestamp = errors.New("block is not newer than the previous one")
)

Various errors that could be returns upon header verification.

View Source 
var (
	ErrTxExpired           = errors.New("transaction has expired")
	ErrInsufficientFunds   = errors.New("insufficient funds")
	ErrTxSmallNetworkFee   = errors.New("too small network fee")
	ErrTxTooBig            = errors.New("too big transaction")
	ErrMemPoolConflict     = errors.New("invalid transaction due to conflicts with the memory pool")
	ErrTxInvalidWitnessNum = errors.New("number of signers doesn't match witnesses")
)

Various errors that could be returned upon verification.

View Source 
var (
	ErrWitnessHashMismatch         = errors.New("witness hash mismatch")
	ErrVerificationFailed          = errors.New("signature check failed")
	ErrUnknownVerificationContract = errors.New("unknown verification contract")
	ErrInvalidVerificationContract = errors.New("verification contract is missing `verify` method")
)

Various witness verification errors.

Functions

func CalculateNetworkFee added in v0.90.0 

func CalculateNetworkFee(script []byte) (int64, int)

CalculateNetworkFee returns network fee for transaction

func ScriptFromWitness 

func ScriptFromWitness(hash util.Uint160, witness *transaction.Witness) ([]byte, error)

ScriptFromWitness returns verification script for provided witness. If hash is not equal to the witness script hash, error is returned.

func SpawnVM added in v0.90.0 

func SpawnVM(ic *interop.Context) *vm.VM

SpawnVM returns a VM with script getter and interop functions set up for current blockchain.

Types

type Blockchain 

type Blockchain struct {
	// contains filtered or unexported fields
}

Blockchain represents the blockchain. It maintans internal state representing the state of the ledger that can be accessed in various ways and changed by adding new blocks or headers.

func NewBlockchain 

func NewBlockchain(s storage.Store, cfg config.ProtocolConfiguration, log *zap.Logger) (*Blockchain, error)

NewBlockchain returns a new blockchain object the will use the given Store as its underlying storage. For it to work correctly you need to spawn a goroutine for its Run method after this initialization.

func (*Blockchain) AddBlock 

func (bc *Blockchain) AddBlock(block *block.Block) error

AddBlock accepts successive block for the Blockchain, verifies it and stores internally. Eventually it will be persisted to the backing storage.

func (*Blockchain) AddHeaders 

func (bc *Blockchain) AddHeaders(headers ...*block.Header) error

AddHeaders processes the given headers and add them to the HeaderHashList. It expects headers to be sorted by index.

func (*Blockchain) AddStateRoot added in v0.76.0 

func (bc *Blockchain) AddStateRoot(r *state.MPTRoot) error

AddStateRoot add new (possibly unverified) state root to the blockchain.

func (*Blockchain) ApplyPolicyToTxSet 

func (bc *Blockchain) ApplyPolicyToTxSet(txes []*transaction.Transaction) []*transaction.Transaction

ApplyPolicyToTxSet applies configured policies to given transaction set. It expects slice to be ordered by fee and returns a subslice of it.

func (*Blockchain) BlockHeight 

func (bc *Blockchain) BlockHeight() uint32

BlockHeight returns the height/index of the highest block.

func (*Blockchain) CalculateClaimable 

func (bc *Blockchain) CalculateClaimable(value *big.Int, startHeight, endHeight uint32) *big.Int

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 (*Blockchain) Close 

func (bc *Blockchain) Close()

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 (*Blockchain) CurrentBlockHash 

func (bc *Blockchain) CurrentBlockHash() (hash util.Uint256)

CurrentBlockHash returns the highest processed block hash.

func (*Blockchain) CurrentHeaderHash 

func (bc *Blockchain) CurrentHeaderHash() (hash util.Uint256)

CurrentHeaderHash returns the hash of the latest known header.

func (*Blockchain) FeePerByte 

func (bc *Blockchain) FeePerByte() int64

FeePerByte returns transaction network fee per byte.

func (*Blockchain) ForEachNEP5Transfer added in v0.77.0 

func (bc *Blockchain) ForEachNEP5Transfer(acc util.Uint160, f func(*state.NEP5Transfer) error) error

ForEachNEP5Transfer executes f for each nep5 transfer in log.

func (*Blockchain) GetAppExecResult 

func (bc *Blockchain) GetAppExecResult(hash util.Uint256) (*state.AppExecResult, error)

GetAppExecResult returns application execution result by the given tx hash.

func (*Blockchain) GetBlock 

func (bc *Blockchain) GetBlock(hash util.Uint256) (*block.Block, error)

GetBlock returns a Block by the given hash.

func (*Blockchain) GetConfig 

func (bc *Blockchain) GetConfig() config.ProtocolConfiguration

GetConfig returns the config stored in the blockchain.

func (*Blockchain) GetContractScriptHash added in v0.91.0 

func (bc *Blockchain) GetContractScriptHash(id int32) (util.Uint160, error)

GetContractScriptHash returns contract script hash by its ID.

func (*Blockchain) GetContractState 

func (bc *Blockchain) GetContractState(hash util.Uint160) *state.Contract

GetContractState returns contract by its script hash.

func (*Blockchain) GetEnrollments 

func (bc *Blockchain) GetEnrollments() ([]state.Validator, error)

GetEnrollments returns all registered validators.

func (*Blockchain) GetGoverningTokenBalance added in v0.90.0 

func (bc *Blockchain) GetGoverningTokenBalance(acc util.Uint160) (*big.Int, uint32)

GetGoverningTokenBalance returns governing token (NEO) balance and the height of the last balance change for the account.

func (*Blockchain) GetHeader 

func (bc *Blockchain) GetHeader(hash util.Uint256) (*block.Header, error)

GetHeader returns data block header identified with the given hash value.

func (*Blockchain) GetHeaderHash 

func (bc *Blockchain) GetHeaderHash(i int) (hash util.Uint256)

GetHeaderHash returns the hash from the headerList by its height/index.

func (*Blockchain) GetMaxBlockSize added in v0.91.0 

func (bc *Blockchain) GetMaxBlockSize() uint32

GetMaxBlockSize returns maximum allowed block size from native Policy contract.

func (*Blockchain) GetMaxBlockSystemFee added in v0.91.0 

func (bc *Blockchain) GetMaxBlockSystemFee() int64

GetMaxBlockSystemFee returns maximum block system fee from native Policy contract.

func (*Blockchain) GetMemPool 

func (bc *Blockchain) GetMemPool() *mempool.Pool

GetMemPool returns the memory pool of the blockchain.

func (*Blockchain) GetNEP5Balances 

func (bc *Blockchain) GetNEP5Balances(acc util.Uint160) *state.NEP5Balances

GetNEP5Balances returns NEP5 balances for the acc.

func (*Blockchain) GetNextBlockValidators added in v0.90.0 

func (bc *Blockchain) GetNextBlockValidators() ([]*keys.PublicKey, error)

GetNextBlockValidators returns next block validators.

func (*Blockchain) GetStandByCommittee added in v0.91.0 

func (bc *Blockchain) GetStandByCommittee() keys.PublicKeys

GetStandByCommittee returns standby committee from the configuration.

func (*Blockchain) GetStandByValidators 

func (bc *Blockchain) GetStandByValidators() keys.PublicKeys

GetStandByValidators returns validators from the configuration.

func (*Blockchain) GetStateRoot added in v0.76.0 

func (bc *Blockchain) GetStateRoot(height uint32) (*state.MPTRootState, error)

GetStateRoot returns state root for a given height.

func (*Blockchain) GetStorageItem 

func (bc *Blockchain) GetStorageItem(id int32, key []byte) *state.StorageItem

GetStorageItem returns an item from storage.

func (*Blockchain) GetStorageItems 

func (bc *Blockchain) GetStorageItems(id int32) (map[string]*state.StorageItem, error)

GetStorageItems returns all storage items for a given contract id.

func (*Blockchain) GetTestVM 

func (bc *Blockchain) GetTestVM(tx *transaction.Transaction) *vm.VM

GetTestVM returns a VM and a Store setup for a test run of some sort of code.

func (*Blockchain) GetTransaction 

func (bc *Blockchain) GetTransaction(hash util.Uint256) (*transaction.Transaction, uint32, error)

GetTransaction returns a TX and its height by the given hash.

func (*Blockchain) GetUtilityTokenBalance added in v0.90.0 

func (bc *Blockchain) GetUtilityTokenBalance(acc util.Uint160) *big.Int

GetUtilityTokenBalance returns utility token (GAS) balance for the acc.

func (*Blockchain) GetValidators 

func (bc *Blockchain) GetValidators() ([]*keys.PublicKey, error)

GetValidators returns current validators.

func (*Blockchain) GoverningTokenHash added in v0.90.0 

func (bc *Blockchain) GoverningTokenHash() util.Uint160

GoverningTokenHash returns the governing token (NEO) native contract hash.

func (*Blockchain) HasBlock 

func (bc *Blockchain) HasBlock(hash util.Uint256) bool

HasBlock returns true if the blockchain contains the given block hash.

func (*Blockchain) HasTransaction 

func (bc *Blockchain) HasTransaction(hash util.Uint256) bool

HasTransaction returns true if the blockchain contains he given transaction hash.

func (*Blockchain) HeaderHeight 

func (bc *Blockchain) HeaderHeight() uint32

HeaderHeight returns the index/height of the highest header.

func (*Blockchain) LastBatch 

func (bc *Blockchain) LastBatch() *storage.MemBatch

LastBatch returns last persisted storage batch.

func (*Blockchain) PoolTx 

func (bc *Blockchain) PoolTx(t *transaction.Transaction) error

PoolTx verifies and tries to add given transaction into the mempool.

func (*Blockchain) Run 

func (bc *Blockchain) Run()

Run runs chain loop, it needs to be run as goroutine and executing it is critical for correct Blockchain operation.

func (*Blockchain) SubscribeForBlocks added in v0.75.0 

func (bc *Blockchain) SubscribeForBlocks(ch chan<- *block.Block)

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 (*Blockchain) SubscribeForExecutions added in v0.75.0 

func (bc *Blockchain) SubscribeForExecutions(ch chan<- *state.AppExecResult)

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 (*Blockchain) SubscribeForNotifications added in v0.75.0 

func (bc *Blockchain) SubscribeForNotifications(ch chan<- *state.NotificationEvent)

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 (*Blockchain) SubscribeForTransactions added in v0.75.0 

func (bc *Blockchain) SubscribeForTransactions(ch chan<- *transaction.Transaction)

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 (*Blockchain) UnsubscribeFromBlocks added in v0.75.0 

func (bc *Blockchain) UnsubscribeFromBlocks(ch chan<- *block.Block)

UnsubscribeFromBlocks unsubscribes given channel from new block notifications, you can close it afterwards. Passing non-subscribed channel is a no-op.

func (*Blockchain) UnsubscribeFromExecutions added in v0.75.0 

func (bc *Blockchain) UnsubscribeFromExecutions(ch chan<- *state.AppExecResult)

UnsubscribeFromExecutions unsubscribes given channel from new execution notifications, you can close it afterwards. Passing non-subscribed channel is a no-op.

func (*Blockchain) UnsubscribeFromNotifications added in v0.75.0 

func (bc *Blockchain) UnsubscribeFromNotifications(ch chan<- *state.NotificationEvent)

UnsubscribeFromNotifications unsubscribes given channel from new execution-generated notifications, you can close it afterwards. Passing non-subscribed channel is a no-op.

func (*Blockchain) UnsubscribeFromTransactions added in v0.75.0 

func (bc *Blockchain) UnsubscribeFromTransactions(ch chan<- *transaction.Transaction)

UnsubscribeFromTransactions unsubscribes given channel from new transaction notifications, you can close it afterwards. Passing non-subscribed channel is a no-op.

func (*Blockchain) UtilityTokenHash added in v0.90.0 

func (bc *Blockchain) UtilityTokenHash() util.Uint160

UtilityTokenHash returns the utility token (GAS) native contract hash.

func (*Blockchain) VerifyTx 

func (bc *Blockchain) VerifyTx(t *transaction.Transaction, block *block.Block) error

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).

type HeaderHashList 

type HeaderHashList struct {
	// contains filtered or unexported fields
}

A HeaderHashList represents a list of header hashes. This data structure in not routine safe and should be used under some kind of protection against race conditions.

func NewHeaderHashList 

func NewHeaderHashList(hashes ...util.Uint256) *HeaderHashList

NewHeaderHashList returns a new pointer to a HeaderHashList.

func (*HeaderHashList) Add 

func (l *HeaderHashList) Add(h ...util.Uint256)

Add appends the given hash to the list of hashes.

func (*HeaderHashList) Get 

func (l *HeaderHashList) Get(i int) util.Uint256

Get returns the hash by the given index.

func (*HeaderHashList) Last 

func (l *HeaderHashList) Last() util.Uint256

Last return the last hash in the HeaderHashList.

func (*HeaderHashList) Len 

func (l *HeaderHashList) Len() int

Len returns the length of the underlying hashes slice.

func (*HeaderHashList) Write 

func (l *HeaderHashList) Write(bw *io.BinWriter, start, n int) error

Write writes n underlying hashes to the given BinWriter starting from start.

type StorageContext 

type StorageContext struct {
	ID       int32
	ReadOnly bool
}

StorageContext contains storing id and read/write flag, it's used as a context for storage manipulation functions.

type StorageFlag added in v0.91.0 

type StorageFlag byte

StorageFlag represents storage flag which denotes whether the stored value is a constant. 

const (
	// None is a storage flag for non-constant items.
	None StorageFlag = 0
	// Constant is a storage flag for constant items.
	Constant StorageFlag = 0x01
)

Source Files

View all Source files

Directories

Path Synopsis
callback
crypto
enumerator
interopnames
iterator
json
runtime
Package mpt implements MPT (Merkle-Patricia Tree).
 Package mpt implements MPT (Merkle-Patricia Tree).

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