state

package
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 Go to latest Published: Jan 29, 2021 License: MIT Imports: 25 Imported by: 1

Documentation

Overview

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

Index

Constants

This section is empty.

Variables

View Source 
var MaxTrieCacheGen = uint16(120)

MaxTrieCacheGen limit after which to evict trie nodes from memory.

Functions

This section is empty.

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 Code 

type Code []byte

Code ...

func (Code) String 

func (c Code) String() string

type DB 

type DB struct {

	// Measurements gathered during execution for debugging purposes
	AccountReads   time.Duration
	AccountHashes  time.Duration
	AccountUpdates time.Duration
	AccountCommits time.Duration
	StorageReads   time.Duration
	StorageHashes  time.Duration
	StorageUpdates time.Duration
	StorageCommits time.Duration
	// contains filtered or unexported fields
}

DB 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) (*DB, error)

New creates a new state from a given trie.

func (*DB) AddBalance 

func (db *DB) AddBalance(addr common.Address, amount *big.Int)

AddBalance adds amount to the account associated with addr.

func (*DB) AddLog 

func (db *DB) AddLog(log *types.Log)

AddLog ...

func (*DB) AddPreimage 

func (db *DB) AddPreimage(hash common.Hash, preimage []byte)

AddPreimage records a SHA3 preimage seen by the VM.

func (*DB) AddRefund 

func (db *DB) AddRefund(gas uint64)

AddRefund adds gas to the refund counter

func (*DB) AddReward added in v1.3.0 

func (db *DB) AddReward(snapshot *stk.ValidatorWrapper, reward *big.Int, shareLookup map[common.Address]numeric.Dec) error

AddReward distributes the reward to all the delegators based on stake percentage.

func (*DB) BlockHash added in v1.10.0 

func (db *DB) BlockHash() common.Hash

BlockHash returns the current block hash set by Prepare.

func (*DB) Commit 

func (db *DB) Commit(deleteEmptyObjects bool) (root common.Hash, err error)

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

func (*DB) Copy 

func (db *DB) Copy() *DB

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

func (*DB) CreateAccount 

func (db *DB) 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 (*DB) Database 

func (db *DB) Database() Database

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

func (*DB) Dump 

func (s *DB) Dump(excludeCode, excludeStorage, excludeMissingPreimages bool) []byte

Dump returns a JSON string representing the entire state as a single json-object

func (*DB) Empty 

func (db *DB) 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 (*DB) Error 

func (db *DB) Error() error

func (*DB) Exist 

func (db *DB) 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 (*DB) Finalise 

func (db *DB) Finalise(deleteEmptyObjects bool)

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

func (*DB) ForEachStorage 

func (db *DB) ForEachStorage(addr common.Address, cb func(key, value common.Hash) bool) error

ForEachStorage ...

func (*DB) GetBalance 

func (db *DB) GetBalance(addr common.Address) *big.Int

GetBalance retrieves the balance from the given address or 0 if object not found

func (*DB) GetCode 

func (db *DB) GetCode(addr common.Address) []byte

GetCode ...

func (*DB) GetCodeHash 

func (db *DB) GetCodeHash(addr common.Address) common.Hash

GetCodeHash ...

func (*DB) GetCodeSize 

func (db *DB) GetCodeSize(addr common.Address) int

GetCodeSize ...

func (*DB) GetCommittedState 

func (db *DB) GetCommittedState(addr common.Address, hash common.Hash) common.Hash

GetCommittedState retrieves a value from the given account's committed storage trie.

func (*DB) GetLogs 

func (db *DB) GetLogs(hash common.Hash) []*types.Log

GetLogs ...

func (*DB) GetNonce 

func (db *DB) GetNonce(addr common.Address) uint64

GetNonce ...

func (*DB) GetOrNewStateObject 

func (db *DB) GetOrNewStateObject(addr common.Address) *Object

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

func (*DB) GetProof 

func (db *DB) GetProof(a common.Address) ([][]byte, error)

GetProof returns the MerkleProof for a given Account

func (*DB) GetRefund 

func (db *DB) GetRefund() uint64

GetRefund returns the current value of the refund counter.

func (*DB) GetState 

func (db *DB) GetState(addr common.Address, hash common.Hash) common.Hash

GetState retrieves a value from the given account's storage trie.

func (*DB) GetStorageProof 

func (db *DB) GetStorageProof(a common.Address, key common.Hash) ([][]byte, error)

GetStorageProof returns the StorageProof for given key

func (*DB) HasSuicided 

func (db *DB) HasSuicided(addr common.Address) bool

HasSuicided ...

func (*DB) IntermediateRoot 

func (db *DB) 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 (*DB) IsValidator added in v1.3.0 

func (db *DB) IsValidator(addr common.Address) bool

IsValidator checks whether it is a validator object

func (*DB) IterativeDump added in v1.10.0 

func (s *DB) IterativeDump(excludeCode, excludeStorage, excludeMissingPreimages bool, output *json.Encoder)

IterativeDump dumps out accounts as json-objects, delimited by linebreaks on stdout

func (*DB) Logs 

func (db *DB) Logs() []*types.Log

Logs ...

func (*DB) Preimages 

func (db *DB) Preimages() map[common.Hash][]byte

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

func (*DB) Prepare 

func (db *DB) 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 (*DB) RawDump 

func (s *DB) RawDump(excludeCode, excludeStorage, excludeMissingPreimages bool) Dump

RawDump returns the entire state an a single large object

func (*DB) Reset 

func (db *DB) 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 (*DB) RevertToSnapshot 

func (db *DB) RevertToSnapshot(revid int)

RevertToSnapshot reverts all state changes made since the given revision.

func (*DB) SetBalance 

func (db *DB) SetBalance(addr common.Address, amount *big.Int)

SetBalance ...

func (*DB) SetCode 

func (db *DB) SetCode(addr common.Address, code []byte)

SetCode ...

func (*DB) SetNonce 

func (db *DB) SetNonce(addr common.Address, nonce uint64)

SetNonce ...

func (*DB) SetState 

func (db *DB) SetState(addr common.Address, key, value common.Hash)

SetState ...

func (*DB) SetValidatorFlag added in v1.3.0 

func (db *DB) SetValidatorFlag(addr common.Address)

SetValidatorFlag checks whether it is a validator object

func (*DB) Snapshot 

func (db *DB) Snapshot() int

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

func (*DB) StorageTrie 

func (db *DB) 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 (*DB) SubBalance 

func (db *DB) SubBalance(addr common.Address, amount *big.Int)

SubBalance subtracts amount from the account associated with addr.

func (*DB) SubRefund 

func (db *DB) SubRefund(gas uint64)

SubRefund removes gas from the refund counter. This method will panic if the refund counter goes below zero

func (*DB) Suicide 

func (db *DB) 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 (*DB) TxIndex added in v1.10.0 

func (db *DB) TxIndex() int

TxIndex returns the current transaction index set by Prepare.

func (*DB) UnsetValidatorFlag added in v1.3.0 

func (db *DB) UnsetValidatorFlag(addr common.Address)

UnsetValidatorFlag checks whether it is a validator object

func (*DB) UpdateValidatorWrapper added in v1.3.3 

func (db *DB) UpdateValidatorWrapper(
	addr common.Address, val *stk.ValidatorWrapper,
) error

UpdateValidatorWrapper updates staking information of a given validator (including delegation info)

func (*DB) ValidatorWrapper added in v1.3.3 

func (db *DB) ValidatorWrapper(
	addr common.Address,
) (*stk.ValidatorWrapper, error)

ValidatorWrapper retrieves the existing validator in the cache. The return value is a reference to the actual validator object in state. The modification on it will be committed to the state object when Finalize() is called.

func (*DB) ValidatorWrapperCopy added in v1.3.8 

func (db *DB) ValidatorWrapperCopy(
	addr common.Address,
) (*stk.ValidatorWrapper, error)

ValidatorWrapperCopy retrieves the existing validator as a copy from state object. Changes on the copy has to be explicitly commited with UpdateValidatorWrapper() to take effect.

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(addrHash, 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(addrHash, codeHash common.Hash) ([]byte, error)

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

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

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, 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 ethdb.Database, cache 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[common.Address]DumpAccount `json:"accounts"`
}

Dump represents the full dump in a collected format, as one large map

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,omitempty"`
	Storage   map[common.Hash]string `json:"storage,omitempty"`
	Address   *common.Address        `json:"address,omitempty"` // Address only present in iterative (line-by-line) mode
	SecureKey hexutil.Bytes          `json:"key,omitempty"`     // If we don't have address, we can output the key

}

DumpAccount represents an account in the state

type ManagedState 

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

ManagedState ...

func ManageState 

func ManageState(statedb *DB) *ManagedState

ManageState 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.

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

func (*ManagedState) HasAccount 

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

HasAccount returns whether the given address is managed or not

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 *DB)

SetState sets the backing layer of the managed state

type Object 

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

Object 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 (*Object) AddBalance 

func (s *Object) 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 (*Object) Address 

func (s *Object) Address() common.Address

Address returns the address of the contract/account

func (*Object) Balance 

func (s *Object) Balance() *big.Int

Balance ...

func (*Object) Code 

func (s *Object) Code(db Database) []byte

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

func (*Object) CodeHash 

func (s *Object) CodeHash() []byte

CodeHash ...

func (*Object) CommitTrie 

func (s *Object) CommitTrie(db Database) error

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

func (*Object) EncodeRLP 

func (s *Object) EncodeRLP(w io.Writer) error

EncodeRLP implements rlp.Encoder.

func (*Object) GetCommittedState 

func (s *Object) GetCommittedState(db Database, key common.Hash) common.Hash

GetCommittedState retrieves a value from the committed account storage trie.

func (*Object) GetState 

func (s *Object) GetState(db Database, key common.Hash) common.Hash

GetState retrieves a value from the account storage trie.

func (*Object) IsValidator added in v1.3.0 

func (s *Object) IsValidator(db Database) bool

IsValidator checks whether it is a validator object

func (*Object) Nonce 

func (s *Object) Nonce() uint64

Nonce ...

func (*Object) ReturnGas 

func (s *Object) ReturnGas(gas *big.Int)

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

func (*Object) SetBalance 

func (s *Object) SetBalance(amount *big.Int)

SetBalance ...

func (*Object) SetCode 

func (s *Object) SetCode(codeHash common.Hash, code []byte)

SetCode ...

func (*Object) SetNonce 

func (s *Object) SetNonce(nonce uint64)

SetNonce ...

func (*Object) SetState 

func (s *Object) SetState(db Database, key, value common.Hash)

SetState updates a value in account storage.

func (*Object) SetStorage added in v1.10.0 

func (s *Object) SetStorage(storage map[common.Hash]common.Hash)

SetStorage replaces the entire state storage with the given one.

After this function is called, all original state will be ignored and state lookup only happens in the fake state storage.

Note this function should only be used for debugging purpose.

func (*Object) SubBalance 

func (s *Object) 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 (*Object) Value 

func (s *Object) Value() *big.Int

Value 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

Storage ...

func (Storage) Copy 

func (s Storage) Copy() Storage

Copy ...

func (Storage) String 

func (s 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

	// 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 trie.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) trie.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 ethdb.KeyValueWriter) error
}

Trie is a Ethereum Merkle Patricia trie.

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