state

package
v0.9.0 Latest Latest
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 Go to latest Published: Jun 4, 2021 License: GPL-3.0 Imports: 18 Imported by: 20

Documentation

Overview

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

Index

Constants

View Source 
const (

	// Default StartingNonce for Morden Testnet
	DefaultTestnetStartingNonce = uint64(1048576)
)
View Source 
const ZipperBlockLength = 1 * 1024 * 1024
View Source 
const ZipperPieceLength = 64 * 1024

Variables

View Source 
var MaxTrieCacheGen = uint16(120)

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

View Source 
var StartingNonce uint64

The starting nonce determines the default nonce when new accounts are being created.

Functions

func NewStateSync 

func NewStateSync(root common.Hash, database ethdb.Database) *trie.Sync

NewStateSync create a new state trie download scheduler.

Types

type Account 

type Account struct {
	Nonce    uint64
	Balance  *big.Int
	Root     common.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 AddressedRawAccount 

type AddressedRawAccount struct {
	DumpAccount
	Addr string
}

type Code 

type Code []byte

func (Code) String 

func (self Code) String() string

type Database 

type Database interface {
	// Accessing tries:
	// OpenTrie opens the main account trie.
	// OpenStorageTrie opens the storage trie of an account.
	OpenTrie(root common.Hash) (Trie, error)
	OpenStorageTrie(addrHash, root common.Hash) (Trie, error)
	// Accessing contract code:
	ContractCode(addrHash, codeHash common.Hash) ([]byte, error)
	ContractCodeSize(addrHash, codeHash common.Hash) (int, error)
	// CopyTrie returns an independent copy of the given trie.
	CopyTrie(Trie) Trie
}

Database wraps access to tries and contract code.

func NewDatabase 

func NewDatabase(db ethdb.Database) Database

NewDatabase creates a backing store for state. The returned database is safe for concurrent use and retains cached trie nodes in memory.

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 Dumps 

type Dumps []Dump

type EncodedAccount 

type EncodedAccount struct {
	Addr  string
	Json  []byte
	Error error
}

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 common.Address) uint64

GetNonce returns the canonical nonce for the managed or unmanaged account

func (*ManagedState) NewNonce 

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

NewNonce returns the new canonical nonce for the managed account

func (*ManagedState) RemoveNonce 

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

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

func (*ManagedState) SetNonce 

func (ms *ManagedState) SetNonce(addr common.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   common.Hash // Hash of the current entry being iterated (nil if not standalone)
	Parent common.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
}

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

func New 

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

Create a new state from a given trie

func (*StateDB) AddBalance 

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

func (*StateDB) AddLog 

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

func (*StateDB) AddRefund 

func (self *StateDB) AddRefund(gas *big.Int)

func (*StateDB) CommitTo 

func (s *StateDB) CommitTo(dbw trie.DatabaseWriter, deleteEmptyObjects bool) (root common.Hash, err error)

CommitTo writes the state to the given 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) vm.Account

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) Dump 

func (self *StateDB) Dump(addresses []common.Address) []byte

func (*StateDB) Empty added in v0.4.0 

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

Empty returns if the account address is considered non-existant or empty (balance, nonce, and code all equal 0)

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) error

func (*StateDB) GetAccount 

func (self *StateDB) GetAccount(addr common.Address) vm.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) 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) GetLogs 

func (self *StateDB) GetLogs(hash common.Hash) vm.Logs

func (*StateDB) GetNonce 

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

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() *big.Int

GetRefund returns the current value of the refund counter. The return value must not be modified by the caller and will become invalid at the next call to AddRefund.

func (*StateDB) GetState 

func (self *StateDB) GetState(a common.Address, b common.Hash) common.Hash

func (*StateDB) HasSuicided 

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

func (*StateDB) IntermediateRoot 

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

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

func (*StateDB) LoadEncodedAccounts 

func (self *StateDB) LoadEncodedAccounts(addresses []common.Address) (accounts map[string][]byte, err error)

func (*StateDB) Logs 

func (self *StateDB) Logs() vm.Logs

func (*StateDB) Preimages 

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

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

func (*StateDB) RawDump 

func (self *StateDB) RawDump(addresses []common.Address) Dump

func (*StateDB) Reset 

func (self *StateDB) Reset(root common.Hash) error

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

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)

func (*StateDB) SetNonce 

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

func (*StateDB) SetState 

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

func (*StateDB) Snapshot 

func (self *StateDB) Snapshot() int

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

func (*StateDB) SortedDump 

func (self *StateDB) SortedDump(addresses []common.Address, prefix string, indent string, out io.Writer) (err error)

func (*StateDB) StartRecord 

func (self *StateDB) StartRecord(thash, bhash common.Hash, ti int)

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) UnsortedDump 

func (self *StateDB) UnsortedDump(addresses []common.Address, prefix string, indent string, out io.Writer) (err error)

func (*StateDB) UnsortedRawDump 

func (self *StateDB) UnsortedRawDump(addresses []common.Address, fwr func(chan EncodedAccount, chan error)) (err error)

type StateObject 

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

StateObject represents an Ethereum account which is being modified.

The usage pattern is as follows: First you need to obtain a state object. Account values can be accessed and modified through the object. Finally, call CommitTrie to write the modified storage trie into a database.

func (*StateObject) AddBalance 

func (c *StateObject) AddBalance(amount *big.Int)

AddBalance removes amount from c's balance. It is used to add funds to the destination account of a transfer.

func (*StateObject) Address 

func (c *StateObject) Address() common.Address

Returns the address of the contract/account

func (*StateObject) Balance 

func (self *StateObject) Balance() *big.Int

func (*StateObject) Code 

func (self *StateObject) Code(db Database) []byte

Code returns the contract code associated with this object, if any.

func (*StateObject) CodeHash 

func (self *StateObject) CodeHash() []byte

func (*StateObject) CommitTrie 

func (self *StateObject) CommitTrie(db Database, dbw trie.DatabaseWriter) error

CommitTrie the storage trie of the object to dwb. This updates the trie root.

func (*StateObject) EncodeRLP 

func (c *StateObject) EncodeRLP(w io.Writer) error

EncodeRLP implements rlp.Encoder.

func (*StateObject) ForEachStorage 

func (s *StateObject) ForEachStorage(cb func(key, value common.Hash) bool) error

func (*StateObject) GetState 

func (self *StateObject) GetState(db Database, key common.Hash) common.Hash

GetState returns a value in account storage.

func (*StateObject) Nonce 

func (self *StateObject) Nonce() uint64

func (*StateObject) ReturnGas 

func (c *StateObject) ReturnGas(*big.Int, *big.Int)

Return the gas back to the origin. Used by the Virtual machine or Closures

func (*StateObject) SetBalance 

func (self *StateObject) SetBalance(amount *big.Int)

func (*StateObject) SetCode 

func (self *StateObject) SetCode(codeHash common.Hash, code []byte)

func (*StateObject) SetNonce 

func (self *StateObject) SetNonce(nonce uint64)

func (*StateObject) SetState 

func (self *StateObject) SetState(db Database, key, value common.Hash)

SetState updates a value in account storage.

func (*StateObject) SubBalance 

func (c *StateObject) SubBalance(amount *big.Int)

SubBalance removes amount from c's balance. It is used to remove funds from the origin account of a transfer.

func (*StateObject) Value 

func (self *StateObject) Value() *big.Int

Never called, but must be present to allow StateObject to be used as a vm.Account interface that also satisfies the vm.ContractRef interface. Interfaces are awesome.

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 {
	TryGet(key []byte) ([]byte, error)
	TryUpdate(key, value []byte) error
	TryDelete(key []byte) error
	CommitTo(trie.DatabaseWriter) (common.Hash, error)
	Hash() common.Hash
	NodeIterator(startKey []byte) trie.NodeIterator
	GetKey([]byte) []byte // TODO(fjl): remove this when SecureTrie is removed
}

Trie is a Ethereum Merkle Trie.

type Zipper 

type Zipper struct {
	MemBrk int
	Mem    []byte
	Bf     bytes.Buffer
}

func (*Zipper) UnZipBytes 

func (self *Zipper) UnZipBytes(data []byte) (result []byte, err error)

func (*Zipper) ZipBytes 

func (self *Zipper) ZipBytes(data []byte) (result []byte, err error)

Source Files

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