state

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 Go to latest Published: Feb 22, 2023 License: GPL-3.0 Imports: 22 Imported by: 0

Documentation

Overview

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

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func NewStateSync 

func NewStateSync(root common.Hash, database ethdb.KeyValueReader, onLeaf func(keys [][]byte, leaf []byte) error, scheme string) *trie.Sync

NewStateSync create a new state trie download scheduler.

Types

type Code 

type Code []byte

func (Code) String 

func (c 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(stateRoot common.Hash, 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)

	// DiskDB returns the underlying key-value disk database.
	DiskDB() ethdb.KeyValueStore

	// 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 NewDatabaseWithConfig constructor.

func NewDatabaseWithConfig 

func NewDatabaseWithConfig(db ethdb.Database, config *trie.Config) Database

NewDatabaseWithConfig 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.

func NewDatabaseWithNodeDB 

func NewDatabaseWithNodeDB(db ethdb.Database, triedb *trie.Database) Database

NewDatabaseWithNodeDB creates a state database with an already initialized node database.

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.

func (*Dump) OnAccount 

func (d *Dump) OnAccount(addr common.Address, account DumpAccount)

OnAccount implements DumpCollector interface

func (*Dump) OnRoot 

func (d *Dump) OnRoot(root common.Hash)

OnRoot implements DumpCollector interface

type DumpAccount 

type DumpAccount struct {
	Balance   string                 `json:"balance"`
	Nonce     uint64                 `json:"nonce"`
	Root      hexutil.Bytes          `json:"root"`
	CodeHash  hexutil.Bytes          `json:"codeHash"`
	Code      hexutil.Bytes          `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 DumpCollector 

type DumpCollector interface {
	// OnRoot is called with the state root
	OnRoot(common.Hash)
	// OnAccount is called once for each account in the trie
	OnAccount(common.Address, DumpAccount)
}

DumpCollector interface which the state trie calls during iteration

type DumpConfig 

type DumpConfig struct {
	SkipCode          bool
	SkipStorage       bool
	OnlyWithAddresses bool
	Start             []byte
	Max               uint64
}

DumpConfig is a set of options to control what portions of the state will be iterated and collected.

type IteratorDump 

type IteratorDump struct {
	Root     string                         `json:"root"`
	Accounts map[common.Address]DumpAccount `json:"accounts"`
	Next     []byte                         `json:"next,omitempty"` // nil if no more accounts
}

IteratorDump is an implementation for iterating over data.

func (*IteratorDump) OnAccount 

func (d *IteratorDump) OnAccount(addr common.Address, account DumpAccount)

OnAccount implements DumpCollector interface

func (*IteratorDump) OnRoot 

func (d *IteratorDump) OnRoot(root common.Hash)

OnRoot implements DumpCollector interface

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 {

	// 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
	SnapshotAccountReads time.Duration
	SnapshotStorageReads time.Duration
	SnapshotCommits      time.Duration
	TrieDBCommits        time.Duration

	AccountUpdated int
	StorageUpdated int
	AccountDeleted int
	StorageDeleted int
	// contains filtered or unexported fields
}

StateDB structs 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, snaps *snapshot.Tree) (*StateDB, error)

New creates a new state from a given trie.

func (*StateDB) AddAddressToAccessList 

func (s *StateDB) AddAddressToAccessList(addr common.Address)

AddAddressToAccessList adds the given address to the access list

func (*StateDB) AddBalance 

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

AddBalance adds amount to the account associated with addr.

func (*StateDB) AddLog 

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

func (*StateDB) AddPreimage 

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

AddPreimage records a SHA3 preimage seen by the VM.

func (*StateDB) AddRefund 

func (s *StateDB) AddRefund(gas uint64)

AddRefund adds gas to the refund counter

func (*StateDB) AddSlotToAccessList 

func (s *StateDB) AddSlotToAccessList(addr common.Address, slot common.Hash)

AddSlotToAccessList adds the given (address, slot)-tuple to the access list

func (*StateDB) AddressInAccessList 

func (s *StateDB) AddressInAccessList(addr common.Address) bool

AddressInAccessList returns true if the given address is in the access list.

func (*StateDB) Commit 

func (s *StateDB) Commit(deleteEmptyObjects bool) (common.Hash, 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 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) 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(opts *DumpConfig) []byte

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

func (*StateDB) DumpToCollector 

func (s *StateDB) DumpToCollector(c DumpCollector, conf *DumpConfig) (nextKey []byte)

DumpToCollector iterates the state according to the given options and inserts the items into a collector for aggregation or serialization.

func (*StateDB) Empty 

func (s *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 (s *StateDB) Error() error

func (*StateDB) Exist 

func (s *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 destructed objects and clears the journal as well as the refunds. Finalise, however, will not push any updates into the tries just yet. Only IntermediateRoot or Commit will do that.

func (*StateDB) ForEachStorage 

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

func (*StateDB) GetBalance 

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

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

func (*StateDB) GetCode 

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

func (*StateDB) GetCodeHash 

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

func (*StateDB) GetCodeSize 

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

func (*StateDB) GetCommittedState 

func (s *StateDB) GetCommittedState(addr common.Address, hash common.Hash) common.Hash

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

func (*StateDB) GetLogs 

func (s *StateDB) GetLogs(hash common.Hash, blockNumber uint64, blockHash common.Hash) []*types.Log

GetLogs returns the logs matching the specified transaction hash, and annotates them with the given blockNumber and blockHash.

func (*StateDB) GetNonce 

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

func (*StateDB) GetOrNewStateObject 

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

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

func (*StateDB) GetProof 

func (s *StateDB) GetProof(addr common.Address) ([][]byte, error)

GetProof returns the Merkle proof for a given account.

func (*StateDB) GetProofByHash 

func (s *StateDB) GetProofByHash(addrHash common.Hash) ([][]byte, error)

GetProofByHash returns the Merkle proof for a given account.

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 common.Address, hash common.Hash) common.Hash

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

func (*StateDB) GetStorageProof 

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

GetStorageProof returns the Merkle proof for given storage slot.

func (*StateDB) GetTransientState 

func (s *StateDB) GetTransientState(addr common.Address, key common.Hash) common.Hash

GetTransientState gets transient storage for a given account.

func (*StateDB) HasSuicided 

func (s *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) IterativeDump 

func (s *StateDB) IterativeDump(opts *DumpConfig, output *json.Encoder)

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

func (*StateDB) IteratorDump 

func (s *StateDB) IteratorDump(opts *DumpConfig) IteratorDump

IteratorDump dumps out a batch of accounts starts with the given start key

func (*StateDB) Logs 

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

func (*StateDB) Preimages 

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

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

func (*StateDB) Prepare 

func (s *StateDB) Prepare(rules params.Rules, sender, coinbase common.Address, dst *common.Address, precompiles []common.Address, list types.AccessList)

Prepare handles the preparatory steps for executing a state transition with. This method must be invoked before state transition.

Berlin fork: - Add sender to access list (2929) - Add destination to access list (2929) - Add precompiles to access list (2929) - Add the contents of the optional tx access list (2930)

Potential EIPs: - Reset access list (Berlin) - Add coinbase to access list (EIP-3651) - Reset transient storage (EIP-1153)

func (*StateDB) RawDump 

func (s *StateDB) RawDump(opts *DumpConfig) Dump

RawDump returns the entire state an a single large object

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 common.Address, amount *big.Int)

func (*StateDB) SetCode 

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

func (*StateDB) SetNonce 

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

func (*StateDB) SetState 

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

func (*StateDB) SetStorage 

func (s *StateDB) SetStorage(addr common.Address, storage map[common.Hash]common.Hash)

SetStorage replaces the entire storage for the specified account with given storage. This function should only be used for debugging.

func (*StateDB) SetTransientState 

func (s *StateDB) SetTransientState(addr common.Address, key, value common.Hash)

SetTransientState sets transient storage for a given account. It adds the change to the journal so that it can be rolled back to its previous value if there is a revert.

func (*StateDB) SetTxContext 

func (s *StateDB) SetTxContext(thash common.Hash, ti int)

SetTxContext sets the current transaction hash and index which are used when the EVM emits new state logs. It should be invoked before transaction execution.

func (*StateDB) SlotInAccessList 

func (s *StateDB) SlotInAccessList(addr common.Address, slot common.Hash) (addressPresent bool, slotPresent bool)

SlotInAccessList returns true if the given (address, slot)-tuple is in the access list.

func (*StateDB) Snapshot 

func (s *StateDB) Snapshot() int

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

func (*StateDB) StartPrefetcher 

func (s *StateDB) StartPrefetcher(namespace string)

StartPrefetcher initializes a new trie prefetcher to pull in nodes from the state trie concurrently while the state is mutated so that when we reach the commit phase, most of the needed data is already hot.

func (*StateDB) StopPrefetcher 

func (s *StateDB) StopPrefetcher()

StopPrefetcher terminates a running prefetcher and reports any leftover stats from the gathered metrics.

func (*StateDB) StorageTrie 

func (s *StateDB) StorageTrie(addr common.Address) (Trie, error)

StorageTrie returns the storage trie of an account. The return value is a copy and is nil for non-existent accounts. An error will be returned if storage trie is existent but can't be loaded correctly.

func (*StateDB) SubBalance 

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

SubBalance subtracts amount from the account associated with addr.

func (*StateDB) SubRefund 

func (s *StateDB) SubRefund(gas uint64)

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

func (*StateDB) Suicide 

func (s *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) TxIndex 

func (s *StateDB) TxIndex() int

TxIndex returns the current transaction index set by Prepare.

type Storage 

type Storage map[common.Hash]common.Hash

func (Storage) Copy 

func (s Storage) Copy() Storage

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 StateTrie 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)

	// TryGetAccount abstracts an account read from the trie. It retrieves the
	// account blob from the trie with provided account address and decodes it
	// with associated decoding algorithm. If the specified account is not in
	// the trie, nil will be returned. If the trie is corrupted(e.g. some nodes
	// are missing or the account blob is incorrect for decoding), an error will
	// be returned.
	TryGetAccount(address common.Address) (*types.StateAccount, 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

	// TryUpdateAccount abstracts an account write to the trie. It encodes the
	// provided account object with associated algorithm and then updates it
	// in the trie with provided address.
	TryUpdateAccount(address common.Address, account *types.StateAccount) 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

	// TryDeleteAccount abstracts an account deletion from the trie.
	TryDeleteAccount(address common.Address) 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 collects all dirty nodes in the trie and replace them with the
	// corresponding node hash. All collected nodes(including dirty leaves if
	// collectLeaf is true) will be encapsulated into a nodeset for return.
	// The returned nodeset can be nil if the trie is clean(nothing to commit).
	// Once the trie is committed, it's not usable anymore. A new trie must
	// be created with new root and updated trie database for following usage
	Commit(collectLeaf bool) (common.Hash, *trie.NodeSet)

	// 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.

Source Files

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Directories

Path Synopsis
Package snapshot implements a journalled, dynamic state dump.
 Package snapshot implements a journalled, dynamic state dump.

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