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



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    func NewStateSync

    func NewStateSync(root common.Hash, database ethdb.KeyValueReader, bloom *trie.SyncBloom) *trie.Sync

      NewStateSync create a new state trie download scheduler.


      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

        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(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 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.

              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      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 DumpCollector

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

                        DumpCollector interface which the state trie calls during iteration

                        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
                                    	// 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) BlockHash

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

                                                      BlockHash returns the current block hash set by Prepare.

                                                      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(excludeCode, excludeStorage, excludeMissingPreimages bool) []byte

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

                                                                func (*StateDB) DumpToCollector

                                                                func (s *StateDB) DumpToCollector(c DumpCollector, excludeCode, excludeStorage, excludeMissingPreimages bool, start []byte, maxResults int) (nextKey []byte)

                                                                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 s 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) []*types.Log

                                                                          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) GetStorageProofByHash

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

                                                                                        GetStorageProofByHash returns the Merkle proof for given storage slot.

                                                                                        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(excludeCode, excludeStorage, excludeMissingPreimages bool, output *json.Encoder)

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

                                                                                            func (*StateDB) IteratorDump

                                                                                            func (s *StateDB) IteratorDump(excludeCode, excludeStorage, excludeMissingPreimages bool, start []byte, maxResults int) 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(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) PrepareAccessList

                                                                                                  func (s *StateDB) PrepareAccessList(sender common.Address, dst *common.Address, precompiles []common.Address, list types.AccessList)

                                                                                                    PrepareAccessList handles the preparatory steps for executing a state transition with regards to both EIP-2929 and EIP-2930:

                                                                                                    - 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)

                                                                                                    This method should only be called if Yolov3/Berlin/2929+2930 is applicable at the current number.

                                                                                                    func (*StateDB) RawDump

                                                                                                    func (s *StateDB) RawDump(excludeCode, excludeStorage, excludeMissingPreimages bool) 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) 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

                                                                                                                    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 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 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.


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