state

package
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 Go to latest Published: Jan 23, 2017 License: GPL-3.0 Imports: 17 Imported by: 0

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)

Trie cache generation limit after which to evic 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

func (Code) String 

func (self Code) String() string

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 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) 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 *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)
	Entry  interface{} // Current state entry being iterated (internal representation)
	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 ethdb.Database) (*StateDB, error)

Create a new state from a given trie

func (*StateDB) AddBalance 

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

AddBalance adds amount to the account associated with addr

func (*StateDB) AddLog 

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

func (*StateDB) AddPreimage 

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

AddPreimage records a SHA3 preimage seen by the VM.

func (*StateDB) AddRefund 

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

func (*StateDB) Commit 

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

Commit commits all state changes to the database.

func (*StateDB) CommitBatch 

func (s *StateDB) CommitBatch(deleteEmptyObjects bool) (root common.Hash, batch ethdb.Batch)

CommitBatch commits all state changes to a write batch but does not execute the batch. It is used to validate state changes against the root hash stored in a block.

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) DeleteSuicides 

func (s *StateDB) DeleteSuicides()

DeleteSuicides flags the suicided objects for deletion so that it won't be referenced again when called / queried up on.

DeleteSuicides should not be used for consensus related updates under any circumstances.

func (*StateDB) Dump 

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

func (*StateDB) Empty 

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

Empty returns whether the state object is either non-existent or empty according to the EIP161 specification (balance = nonce = code = 0)

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

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) GetStateObject 

func (self *StateDB) GetStateObject(addr common.Address) (stateObject *StateObject)

Retrieve a state object given my the address. Returns nil if not found.

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) Logs 

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

func (*StateDB) MarkStateObjectDirty 

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

MarkStateObjectDirty adds the specified object to the dirty map to avoid costly state object cache iteration to find a handful of modified ones.

func (*StateDB) New 

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

New creates a new statedb by reusing any journalled tries to avoid costly disk io.

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() 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) StartRecord 

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

func (*StateDB) SubBalance 

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

SubBalance subtracts amount from the account associated with addr

func (*StateDB) Suicide 

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

Suicide marks the given account as suicided. This clears the account balance.

The account's state object is still available until the state is committed, GetStateObject will return a non-nil account after Suicide.

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 trie.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 trie.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 (self *StateObject) ForEachStorage(cb func(key, value common.Hash) bool)

func (*StateObject) GetState 

func (self *StateObject) GetState(db trie.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(gas *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 trie.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 StateSync 

type StateSync trie.TrieSync

StateSync is the main state synchronisation scheduler, which provides yet the unknown state hashes to retrieve, accepts node data associated with said hashes and reconstructs the state database step by step until all is done.

func NewStateSync 

func NewStateSync(root common.Hash, database trie.DatabaseReader) *StateSync

NewStateSync create a new state trie download scheduler.

func (*StateSync) Missing 

func (s *StateSync) Missing(max int) []common.Hash

Missing retrieves the known missing nodes from the state trie for retrieval.

func (*StateSync) Pending 

func (s *StateSync) Pending() int

Pending returns the number of state entries currently pending for download.

func (*StateSync) Process 

func (s *StateSync) Process(list []trie.SyncResult, dbw trie.DatabaseWriter) (bool, int, error)

Process injects a batch of retrieved trie nodes data, returning if something was committed to the database and also the index of an entry if processing of it failed.

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)

Source Files

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