state

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 Go to latest Published: Sep 23, 2019 License: LGPL-3.0 Imports: 15 Imported by: 0

README

state

use ethereum state model

Documentation

Overview

Package state provides a caching layer atop the Ethereum state mtp.

Index

Constants

This section is empty.

Variables

View Source 
var MaxTrieCacheGen = uint16(120)

MaxTrieCacheGen Trie cache generation limit after which to evict trie nodes from memory.

Functions

func NewStateSync 

func NewStateSync(root utils.Hash, database mtp.DatabaseReader) *mtp.Sync

NewStateSync create a new state trie download scheduler.

Types

type Account 

type Account struct {
	// dpos
	UnLockedBalance     *big.Int
	UnDelegateTimestamp *big.Int

	LockedBalance     *big.Int
	DelegateTimestamp *big.Int

	Nonce    uint64
	Balance  *big.Int
	Root     utils.Hash // merkle root of the storage trie
	CodeHash []byte
}

Account is the Ethereum consensus representation of accounts. These objects are stored in the main account trie.

type Code 

type Code []byte

func (Code) String 

func (s Code) String() string

type Database 

type Database interface {
	// OpenTrie opens the main account mtp.
	OpenTrie(root utils.Hash) (Trie, error)

	// OpenStorageTrie opens the storage trie of an account.
	OpenStorageTrie(addrHash, root utils.Hash) (Trie, error)

	// CopyTrie returns an independent copy of the given mtp.
	CopyTrie(Trie) Trie

	// ContractCode retrieves a particular contract's code.
	ContractCode(addrHash, codeHash utils.Hash) ([]byte, error)

	// ContractCodeSize retrieves a particular contracts code's size.
	ContractCodeSize(addrHash, codeHash utils.Hash) (int, error)

	// TrieDB retrieves the low level trie database used for data storage.
	TrieDB() *mtp.Database
}

Database wraps access to tries and contract code.

func NewDatabase 

func NewDatabase(db ldb.Database) Database

NewDatabase creates a backing store for state. The returned database is safe for concurrent use and retains cached trie nodes in memory. The pool is an optional intermediate trie-node memory pool between the low level storage layer and the high level trie abstraction.

type Dump 

type Dump struct {
	Root     string                 `json:"root"`
	Accounts map[string]DumpAccount `json:"accounts"`
}

type DumpAccount 

type DumpAccount struct {
	Balance           string            `json:"balance"`
	LockedBalance     string            `json:"lockedBalance"`
	DelegateTimestamp string            `json:"delegateTimestamp"`
	Nonce             uint64            `json:"nonce"`
	Root              string            `json:"root"`
	CodeHash          string            `json:"codeHash"`
	Code              string            `json:"code"`
	Storage           map[string]string `json:"storage"`
}

type ManagedState 

type ManagedState struct {
	*StateDB
	// contains filtered or unexported fields
}

func ManageState 

func ManageState(statedb *StateDB) *ManagedState

ManagedState returns a new managed state with the statedb as it's backing layer

func (*ManagedState) GetNonce 

func (ms *ManagedState) GetNonce(addr utils.Address) uint64

GetNonce returns the canonical nonce for the managed or unmanaged account.

Because GetNonce mutates the DB, we must take a write lock.

func (*ManagedState) HasAccount 

func (ms *ManagedState) HasAccount(addr utils.Address) bool

HasAccount returns whether the given address is managed or not

func (*ManagedState) NewNonce 

func (ms *ManagedState) NewNonce(addr utils.Address) uint64

NewNonce returns the new canonical nonce for the managed account

func (*ManagedState) RemoveNonce 

func (ms *ManagedState) RemoveNonce(addr utils.Address, n uint64)

RemoveNonce removed the nonce from the managed state and all future pending nonces

func (*ManagedState) SetNonce 

func (ms *ManagedState) SetNonce(addr utils.Address, nonce uint64)

SetNonce sets the new canonical nonce for the managed state

func (*ManagedState) SetState 

func (ms *ManagedState) SetState(statedb *StateDB)

SetState sets the backing layer of the managed state

type NodeIterator 

type NodeIterator struct {
	Hash   utils.Hash // Hash of the current entry being iterated (nil if not standalone)
	Parent utils.Hash // Hash of the first full ancestor node (nil if current is the root)

	Error error // Failure set in case of an internal error in the iterator
	// contains filtered or unexported fields
}

NodeIterator is an iterator to traverse the entire state trie post-order, including all of the contract code and contract state tries.

func NewNodeIterator 

func NewNodeIterator(state *StateDB) *NodeIterator

NewNodeIterator creates an post-order state node iterator.

func (*NodeIterator) Next 

func (it *NodeIterator) Next() bool

Next moves the iterator to the next node, returning whether there are any further nodes. In case of an internal error this method returns false and sets the Error field to the encountered failure.

type StateDB 

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

StateDB within the ethereum protocol are used to store anything within the merkle mtp. StateDBs take care of caching and storing nested states. It's the general query interface to retrieve: * Contracts * Accounts

func New 

func New(root utils.Hash, db Database) (*StateDB, error)

New Create a new state from a given mtp.

func (*StateDB) AddBalance 

func (s *StateDB) AddBalance(addr utils.Address, amount *big.Int)

AddBalance adds amount to the account associated with addr.

func (*StateDB) AddLog 

func (s *StateDB) AddLog(tlog *types.Log)

func (*StateDB) AddPreimage 

func (s *StateDB) AddPreimage(hash utils.Hash, preimage []byte)

AddPreimage records a SHA3 preimage seen by the VM.

func (*StateDB) AddRefund 

func (s *StateDB) AddRefund(gas uint64)

func (*StateDB) Commit 

func (s *StateDB) Commit(deleteEmptyObjects bool) (root utils.Hash, err error)

Commit writes the state to the underlying in-memory trie database.

func (*StateDB) Copy 

func (s *StateDB) Copy() *StateDB

Copy creates a deep, independent copy of the state. Snapshots of the copied state cannot be applied to the copy.

func (*StateDB) CreateAccount 

func (s *StateDB) CreateAccount(addr utils.Address)

CreateAccount explicitly creates a state object. If a state object with the address already exists the balance is carried over to the new account.

CreateAccount is called during the EVM CREATE operation. The situation might arise that a contract does the following:

  1. sends funds to sha(account ++ (nonce + 1))
  2. tx_create(sha(account ++ nonce)) (note that this gets the address of 1)

Carrying over the balance ensures that Ether doesn't disappear.

func (*StateDB) Database 

func (s *StateDB) Database() Database

Database retrieves the low level database supporting the lower level trie ops.

func (*StateDB) Dump 

func (s *StateDB) Dump() []byte

func (*StateDB) Empty 

func (s *StateDB) Empty(addr utils.Address) bool

Empty returns whether the state object is either non-existent or empty according to the EIP161 specification (balance = nonce = code = 0)

func (*StateDB) Error 

func (s *StateDB) Error() error

func (*StateDB) Exist 

func (s *StateDB) Exist(addr utils.Address) bool

Exist reports whether the given account address exists in the state. Notably this also returns true for suicided accounts.

func (*StateDB) Finalise 

func (s *StateDB) Finalise(deleteEmptyObjects bool)

Finalise finalises the state by removing the self destructed objects and clears the journal as well as the refunds.

func (*StateDB) ForEachStorage 

func (s *StateDB) ForEachStorage(addr utils.Address, cb func(key, value utils.Hash) bool)

func (*StateDB) GetBalance 

func (s *StateDB) GetBalance(addr utils.Address) *big.Int

func (*StateDB) GetCode 

func (s *StateDB) GetCode(addr utils.Address) []byte

func (*StateDB) GetCodeHash 

func (s *StateDB) GetCodeHash(addr utils.Address) utils.Hash

func (*StateDB) GetCodeSize 

func (s *StateDB) GetCodeSize(addr utils.Address) int

func (*StateDB) GetDelegateTimestamp 

func (s *StateDB) GetDelegateTimestamp(addr utils.Address) *big.Int

func (*StateDB) GetLockedBalance 

func (s *StateDB) GetLockedBalance(addr utils.Address) *big.Int

func (*StateDB) GetLogs 

func (s *StateDB) GetLogs(hash utils.Hash) []*types.Log

func (*StateDB) GetNonce 

func (s *StateDB) GetNonce(addr utils.Address) uint64

func (*StateDB) GetOrNewStateObject 

func (s *StateDB) GetOrNewStateObject(addr utils.Address) *stateObject

GetOrNewStateObject Retrieve a state object or create a new state object if nil.

func (*StateDB) GetRefund 

func (s *StateDB) GetRefund() uint64

GetRefund returns the current value of the refund counter.

func (*StateDB) GetState 

func (s *StateDB) GetState(addr utils.Address, bhash utils.Hash) utils.Hash

func (*StateDB) GetUnDelegateTimestamp 

func (s *StateDB) GetUnDelegateTimestamp(addr utils.Address) *big.Int

func (*StateDB) GetUnLockedBalance 

func (s *StateDB) GetUnLockedBalance(addr utils.Address) *big.Int

func (*StateDB) HasSuicided 

func (s *StateDB) HasSuicided(addr utils.Address) bool

func (*StateDB) IntermediateRoot 

func (s *StateDB) IntermediateRoot(deleteEmptyObjects bool) utils.Hash

IntermediateRoot computes the current root hash of the state mtp. It is called in between transactions to get the root hash that goes into transaction receipts.

func (*StateDB) Logs 

func (s *StateDB) Logs() []*types.Log

func (*StateDB) Preimages 

func (s *StateDB) Preimages() map[utils.Hash][]byte

Preimages returns a list of SHA3 preimages that have been submitted.

func (*StateDB) Prepare 

func (s *StateDB) Prepare(thash, bhash utils.Hash, ti int)

Prepare sets the current transaction hash and index and block hash which is used when the EVM emits new state logs.

func (*StateDB) RawDump 

func (s *StateDB) RawDump() Dump

func (*StateDB) Reset 

func (s *StateDB) Reset(root utils.Hash) error

Reset clears out all ephemeral state objects from the state db, but keeps the underlying state trie to avoid reloading data for the next operations.

func (*StateDB) RevertToSnapshot 

func (s *StateDB) RevertToSnapshot(revid int)

RevertToSnapshot reverts all state changes made since the given revision.

func (*StateDB) SetBalance 

func (s *StateDB) SetBalance(addr utils.Address, amount *big.Int)

func (*StateDB) SetCode 

func (s *StateDB) SetCode(addr utils.Address, code []byte)

func (*StateDB) SetDelegateTimestamp 

func (s *StateDB) SetDelegateTimestamp(addr utils.Address, timestamp *big.Int)

func (*StateDB) SetLockedBalance 

func (s *StateDB) SetLockedBalance(addr utils.Address, amount *big.Int)

func (*StateDB) SetNonce 

func (s *StateDB) SetNonce(addr utils.Address, nonce uint64)

func (*StateDB) SetState 

func (s *StateDB) SetState(addr utils.Address, key, value utils.Hash)

func (*StateDB) SetUnDelegateTimestamp 

func (s *StateDB) SetUnDelegateTimestamp(addr utils.Address, timestamp *big.Int)

func (*StateDB) SetUnLockedBalance 

func (s *StateDB) SetUnLockedBalance(addr utils.Address, amount *big.Int)

func (*StateDB) Snapshot 

func (s *StateDB) Snapshot() int

Snapshot returns an identifier for the current revision of the state.

func (*StateDB) StorageTrie 

func (s *StateDB) StorageTrie(addr utils.Address) Trie

StorageTrie returns the storage trie of an account. The return value is a copy and is nil for non-existent accounts.

func (*StateDB) SubBalance 

func (s *StateDB) SubBalance(addr utils.Address, amount *big.Int)

SubBalance subtracts amount from the account associated with addr.

func (*StateDB) Suicide 

func (s *StateDB) Suicide(addr utils.Address) bool

Suicide marks the given account as suicided. This clears the account balance.

The account's state object is still available until the state is committed, getStateObject will return a non-nil account after Suicide.

type Storage 

type Storage map[utils.Hash]utils.Hash

func (Storage) Copy 

func (s Storage) Copy() Storage

func (Storage) String 

func (s Storage) String() (str string)

type Trie 

type Trie interface {
	TryGet(key []byte) ([]byte, error)
	TryUpdate(key, value []byte) error
	TryDelete(key []byte) error
	Commit(onleaf mtp.LeafCallback) (utils.Hash, error)
	Hash() utils.Hash
	NodeIterator(startKey []byte) mtp.NodeIterator
	GetKey([]byte) []byte // TODO(fjl): remove this when SecureTrie is removed
	Prove(key []byte, fromLevel uint, proofDb ldb.Writer) error
}

Trie is a Ethereum Merkle mtp.

Source Files

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