state

package
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 Go to latest Published: Sep 17, 2019 License: GPL-3.0 Imports: 22 Imported by: 0

Documentation

Overview

Package state provides an uppermost caching layer of the Klaytn state trie. This package is used to read/write stateObject from/to StateDB and it also acts as a bridge between the objects and the persistent layer.

Overview of state package

stateObject represents a Klaytn account identified by its address. Once it is loaded from the persistent layer, it is cached and managed by StateDB.

StateDB caches stateObjects and mediates the operations to them.

Source Files

Related functions and variables are defined in the files listed below

  • database.go : Defines Database and other interfaces used in the package
  • dump.go : Functions to dump the contents of StateDB both in raw format and indented format
  • journal.go : journal and state changes to track the list of state modifications since the last state commit
  • state_object.go : Implementation of stateObject
  • state_object_encoder.go : stateObjectEncoder is used to encode stateObject in parallel manner
  • statedb.go : Implementation of StateDB
  • sync.go : Functions to schedule a state trie download

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func NewCachedStateObjects 

func NewCachedStateObjects() common.Cache

NewCachedStateObjects returns a new Common.Cache object for cachedStateObjects.

func NewStateSync 

func NewStateSync(root common.Hash, database database.DBManager) *statedb.TrieSync

NewStateSync create a new state trie download scheduler.

Types

type Code 

type Code []byte

func (Code) String 

func (self Code) String() string

type Database 

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

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

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

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

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

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

Database wraps access to tries and contract code.

func NewDatabase 

func NewDatabase(db database.DBManager) Database

NewDatabase creates a backing store for state. The returned database is safe for concurrent use, but does not retain any recent trie nodes in memory. To keep some historical state in memory, use the NewDatabaseWithCache constructor.

func NewDatabaseWithCache 

func NewDatabaseWithCache(db database.DBManager, cacheSize int) Database

NewDatabaseWithCache creates a backing store for state. The returned database is safe for concurrent use and retains a lot of collapsed RLP trie nodes in a large memory cache.

type Dump 

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

type DumpAccount 

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

type StateDB 

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

StateDBs within the Klaytn protocol are used to cache stateObjects from Merkle Patricia Trie and mediate the operations to them.

func New 

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

Create a new state from a given trie.

func NewWithCache 

func NewWithCache(root common.Hash, db Database, cachedStateObjects common.Cache) (*StateDB, error)

NewWithCache creates a new state from a given trie with state object caching enabled.

func (*StateDB) AddBalance 

func (self *StateDB) AddBalance(addr common.Address, amount *big.Int)

AddBalance adds amount to the account associated with addr.

func (*StateDB) AddLog 

func (self *StateDB) AddLog(log *types.Log)

func (*StateDB) AddPreimage 

func (self *StateDB) AddPreimage(hash common.Hash, preimage []byte)

AddPreimage records a SHA3 preimage seen by the VM.

func (*StateDB) AddRefund 

func (self *StateDB) AddRefund(gas uint64)

func (*StateDB) Commit 

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

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

func (*StateDB) Copy 

func (self *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 (self *StateDB) CreateAccount(addr common.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) CreateEOA 

func (self *StateDB) CreateEOA(addr common.Address, humanReadable bool, key accountkey.AccountKey)

func (*StateDB) CreateSmartContractAccount 

func (self *StateDB) CreateSmartContractAccount(addr common.Address, format params.CodeFormat)

func (*StateDB) CreateSmartContractAccountWithKey 

func (self *StateDB) CreateSmartContractAccountWithKey(addr common.Address, humanReadable bool, key accountkey.AccountKey, format params.CodeFormat)

func (*StateDB) Database 

func (self *StateDB) Database() Database

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

func (*StateDB) Dump 

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

func (*StateDB) Empty 

func (self *StateDB) Empty(addr common.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 (self *StateDB) Error() error

func (*StateDB) Exist 

func (self *StateDB) Exist(addr common.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 (db *StateDB) ForEachStorage(addr common.Address, cb func(key, value common.Hash) bool)

func (*StateDB) GetAccount 

func (self *StateDB) GetAccount(addr common.Address) account.Account

func (*StateDB) GetBalance 

func (self *StateDB) GetBalance(addr common.Address) *big.Int

Retrieve the balance from the given address or 0 if object not found

func (*StateDB) GetCachedStateObjects 

func (self *StateDB) GetCachedStateObjects() common.Cache

GetCachedStateObjects returns its cachedStateObjects.

func (*StateDB) GetCode 

func (self *StateDB) GetCode(addr common.Address) []byte

func (*StateDB) GetCodeHash 

func (self *StateDB) GetCodeHash(addr common.Address) common.Hash

func (*StateDB) GetCodeSize 

func (self *StateDB) GetCodeSize(addr common.Address) int

func (*StateDB) GetKey 

func (self *StateDB) GetKey(addr common.Address) accountkey.AccountKey

func (*StateDB) GetLogs 

func (self *StateDB) GetLogs(hash common.Hash) []*types.Log

func (*StateDB) GetNonce 

func (self *StateDB) GetNonce(addr common.Address) uint64

func (*StateDB) GetOrNewSmartContract 

func (self *StateDB) GetOrNewSmartContract(addr common.Address) *stateObject

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

func (*StateDB) GetOrNewStateObject 

func (self *StateDB) GetOrNewStateObject(addr common.Address) *stateObject

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

func (*StateDB) GetRefund 

func (self *StateDB) GetRefund() uint64

GetRefund returns the current value of the refund counter.

func (*StateDB) GetState 

func (self *StateDB) GetState(addr common.Address, bhash common.Hash) common.Hash

func (*StateDB) GetTxHash 

func (s *StateDB) GetTxHash() common.Hash

GetTxHash returns the hash of current running transaction.

func (*StateDB) HasSuicided 

func (self *StateDB) HasSuicided(addr common.Address) bool

func (*StateDB) IncNonce 

func (self *StateDB) IncNonce(addr common.Address)

IncNonce increases the nonce of the account of the given address by one.

func (*StateDB) IntermediateRoot 

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

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

func (*StateDB) IsContractAccount 

func (self *StateDB) IsContractAccount(addr common.Address) bool

func (*StateDB) IsContractAvailable 

func (self *StateDB) IsContractAvailable(addr common.Address) bool

IsContractAvailable returns true if the account corresponding to the given address implements ProgramAccount.

func (*StateDB) IsProgramAccount 

func (self *StateDB) IsProgramAccount(addr common.Address) bool

IsProgramAccount returns true if the account corresponding to the given address implements ProgramAccount.

func (*StateDB) IsValidCodeFormat 

func (self *StateDB) IsValidCodeFormat(addr common.Address) bool

func (*StateDB) Logs 

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

func (*StateDB) Preimages 

func (self *StateDB) Preimages() map[common.Hash][]byte

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

func (*StateDB) Prepare 

func (self *StateDB) Prepare(thash, bhash common.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 (self *StateDB) RawDump() Dump

func (*StateDB) Reset 

func (self *StateDB) Reset(root common.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) ResetExceptCachedStateObjects 

func (self *StateDB) ResetExceptCachedStateObjects(root common.Hash)

ResetExceptCachedStateObjects clears out all ephemeral state objects from the state db, but keeps 1) underlying state trie and 2) cachedStateObjects to avoid reloading data.

func (*StateDB) RevertToSnapshot 

func (self *StateDB) RevertToSnapshot(revid int)

RevertToSnapshot reverts all state changes made since the given revision.

func (*StateDB) SetBalance 

func (self *StateDB) SetBalance(addr common.Address, amount *big.Int)

func (*StateDB) SetCode 

func (self *StateDB) SetCode(addr common.Address, code []byte) error

func (*StateDB) SetNonce 

func (self *StateDB) SetNonce(addr common.Address, nonce uint64)

func (*StateDB) SetState 

func (self *StateDB) SetState(addr common.Address, key, value common.Hash)

func (*StateDB) Snapshot 

func (self *StateDB) Snapshot() int

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

func (*StateDB) StorageTrie 

func (self *StateDB) StorageTrie(addr common.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 (self *StateDB) SubBalance(addr common.Address, amount *big.Int)

SubBalance subtracts amount from the account associated with addr.

func (*StateDB) Suicide 

func (self *StateDB) Suicide(addr common.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.

func (*StateDB) UpdateCachedStateObjects 

func (self *StateDB) UpdateCachedStateObjects(root common.Hash)

UpdateCachedStateObjects copies stateObjects to cachedStateObjects. And then, call ResetExceptCachedStateObjects() to clear out all ephemeral state objects, except for 1) underlying state trie and 2) cachedStateObjects.

func (*StateDB) UpdateKey 

func (self *StateDB) UpdateKey(addr common.Address, newKey accountkey.AccountKey, currentBlockNumber uint64) error

UpdateKey updates the account's key with the given key.

func (*StateDB) UpdateTxPoolStateCache 

func (self *StateDB) UpdateTxPoolStateCache(nonceCache common.Cache, balanceCache common.Cache)

UpdateTxPoolStateCache updates the caches used in TxPool.

func (*StateDB) UseCachedStateObjects 

func (self *StateDB) UseCachedStateObjects() bool

UseCachedStateObjects returns if it uses cachedStateObjects or not.

type Storage 

type Storage map[common.Hash]common.Hash

func (Storage) Copy 

func (self Storage) Copy() Storage

func (Storage) String 

func (self Storage) String() (str string)

type Trie 

type Trie interface {
	// GetKey returns the sha3 preimage of a hashed key that was previously used
	// to store a value.
	//
	// TODO(fjl): remove this when SecureTrie is removed
	GetKey([]byte) []byte
	// TryGet returns the value for key stored in the trie. The value bytes must
	// not be modified by the caller. If a node was not found in the database, a
	// trie.MissingNodeError is returned.
	TryGet(key []byte) ([]byte, error)
	// TryUpdate associates key with value in the trie. If value has length zero, any
	// existing value is deleted from the trie. The value bytes must not be modified
	// by the caller while they are stored in the trie. If a node was not found in the
	// database, a trie.MissingNodeError is returned.
	TryUpdate(key, value []byte) error
	TryUpdateWithKeys(key, hashKey, hexKey, value []byte) error
	// TryDelete removes any existing value for key from the trie. If a node was not
	// found in the database, a trie.MissingNodeError is returned.
	TryDelete(key []byte) error
	// Hash returns the root hash of the trie. It does not write to the database and
	// can be used even if the trie doesn't have one.
	Hash() common.Hash
	// Commit writes all nodes to the trie's memory database, tracking the internal
	// and external (for account tries) references.
	Commit(onleaf statedb.LeafCallback) (common.Hash, error)
	// NodeIterator returns an iterator that returns nodes of the trie. Iteration
	// starts at the key after the given start key.
	NodeIterator(startKey []byte) statedb.NodeIterator
	// Prove constructs a Merkle proof for key. The result contains all encoded nodes
	// on the path to the value at key. The value itself is also included in the last
	// node and can be retrieved by verifying the proof.
	//
	// If the trie does not contain a value for key, the returned proof contains all
	// nodes of the longest existing prefix of the key (at least the root), ending
	// with the node that proves the absence of the key.
	Prove(key []byte, fromLevel uint, proofDb database.DBManager) error
}

Trie is a Klaytn Merkle Patricia trie.

Source Files

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