light

package
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 Go to latest Published: Jun 8, 2021 License: GPL-3.0 Imports: 20 Imported by: 0

Documentation

Overview

Package light implements on-demand retrieval capable state and chain objects for the Ethereum Light Client.

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrNoTrustedCht = errors.New("No trusted canonical hash trie")
	ErrNoHeader     = errors.New("Header not found")

	ChtFrequency     = uint64(4096)
	ChtConfirmations = uint64(2048)
)
View Source 
var NoOdr = context.Background()

NoOdr is the default context passed to an ODR capable function when the ODR service is not required.

Functions

func DeleteTrustedCht 

func DeleteTrustedCht(db ethdb.Database)

func GetBlock 

func GetBlock(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (*types.Block, error)

GetBlock retrieves an entire block corresponding to the hash, assembling it back from the stored header and body.

func GetBlockReceipts 

func GetBlockReceipts(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (types.Receipts, error)

GetBlockReceipts retrieves the receipts generated by the transactions included in a block given by its hash.

func GetBody 

func GetBody(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (*types.Body, error)

GetBody retrieves the block body (transactons, uncles) corresponding to the hash.

func GetBodyRLP 

func GetBodyRLP(ctx context.Context, odr OdrBackend, hash common.Hash, number uint64) (rlp.RawValue, error)

GetBodyRLP retrieves the block body (transactions and uncles) in RLP encoding.

func GetCanonicalHash 

func GetCanonicalHash(ctx context.Context, odr OdrBackend, number uint64) (common.Hash, error)

func GetHeaderByNumber 

func GetHeaderByNumber(ctx context.Context, odr OdrBackend, number uint64) (*types.Header, error)

func WriteTrustedCht 

func WriteTrustedCht(db ethdb.Database, cht TrustedCht)

Types

type BlockRequest 

type BlockRequest struct {
	OdrRequest
	Hash   common.Hash
	Number uint64
	Rlp    []byte
}

BlockRequest is the ODR request type for retrieving block bodies

func (*BlockRequest) StoreResult 

func (req *BlockRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type ChtNode 

type ChtNode struct {
	Hash common.Hash
	Td   *big.Int
}

type ChtRequest 

type ChtRequest struct {
	OdrRequest
	ChtNum, BlockNum uint64
	ChtRoot          common.Hash
	Header           *types.Header
	Td               *big.Int
	Proof            []rlp.RawValue
}

TrieRequest is the ODR request type for state/storage trie entries

func (*ChtRequest) StoreResult 

func (req *ChtRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type Code 

type Code []byte

Code represents a contract code in binary form

func (Code) String 

func (self Code) String() string

String returns a string representation of the code

type CodeRequest 

type CodeRequest struct {
	OdrRequest
	Id   *TrieID
	Hash common.Hash
	Data []byte
}

CodeRequest is the ODR request type for retrieving contract code

func (*CodeRequest) StoreResult 

func (req *CodeRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type LightChain 

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

LightChain represents a canonical chain that by default only handles block headers, downloading block bodies and receipts on demand through an ODR interface. It only does header validation during chain insertion.

func NewLightChain 

func NewLightChain(odr OdrBackend, config *params.ChainConfig, engine consensus.Engine, mux *event.TypeMux) (*LightChain, error)

NewLightChain returns a fully initialised light chain using information available in the database. It initialises the default Ethereum header validator.

func (*LightChain) CurrentHeader 

func (self *LightChain) CurrentHeader() *types.Header

CurrentHeader retrieves the current head header of the canonical chain. The header is retrieved from the HeaderChain's internal cache.

func (*LightChain) Engine 

func (bc *LightChain) Engine() consensus.Engine

Engine retrieves the light chain's consensus engine.

func (*LightChain) GasLimit 

func (self *LightChain) GasLimit() *big.Int

GasLimit returns the gas limit of the current HEAD block.

func (*LightChain) Genesis 

func (bc *LightChain) Genesis() *types.Block

Genesis returns the genesis block

func (*LightChain) GetBlock 

func (self *LightChain) GetBlock(ctx context.Context, hash common.Hash, number uint64) (*types.Block, error)

GetBlock retrieves a block from the database or ODR service by hash and number, caching it if found.

func (*LightChain) GetBlockByHash 

func (self *LightChain) GetBlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error)

GetBlockByHash retrieves a block from the database or ODR service by hash, caching it if found.

func (*LightChain) GetBlockByNumber 

func (self *LightChain) GetBlockByNumber(ctx context.Context, number uint64) (*types.Block, error)

GetBlockByNumber retrieves a block from the database or ODR service by number, caching it (associated with its hash) if found.

func (*LightChain) GetBlockHashesFromHash 

func (self *LightChain) GetBlockHashesFromHash(hash common.Hash, max uint64) []common.Hash

GetBlockHashesFromHash retrieves a number of block hashes starting at a given hash, fetching towards the genesis block.

func (*LightChain) GetBody 

func (self *LightChain) GetBody(ctx context.Context, hash common.Hash) (*types.Body, error)

GetBody retrieves a block body (transactions and uncles) from the database or ODR service by hash, caching it if found.

func (*LightChain) GetBodyRLP 

func (self *LightChain) GetBodyRLP(ctx context.Context, hash common.Hash) (rlp.RawValue, error)

GetBodyRLP retrieves a block body in RLP encoding from the database or ODR service by hash, caching it if found.

func (*LightChain) GetHeader 

func (self *LightChain) GetHeader(hash common.Hash, number uint64) *types.Header

GetHeader retrieves a block header from the database by hash and number, caching it if found.

func (*LightChain) GetHeaderByHash 

func (self *LightChain) GetHeaderByHash(hash common.Hash) *types.Header

GetHeaderByHash retrieves a block header from the database by hash, caching it if found.

func (*LightChain) GetHeaderByNumber 

func (self *LightChain) GetHeaderByNumber(number uint64) *types.Header

GetHeaderByNumber retrieves a block header from the database by number, caching it (associated with its hash) if found.

func (*LightChain) GetHeaderByNumberOdr 

func (self *LightChain) GetHeaderByNumberOdr(ctx context.Context, number uint64) (*types.Header, error)

GetHeaderByNumberOdr retrieves a block header from the database or network by number, caching it (associated with its hash) if found.

func (*LightChain) GetTd 

func (self *LightChain) GetTd(hash common.Hash, number uint64) *big.Int

GetTd retrieves a block's total difficulty in the canonical chain from the database by hash and number, caching it if found.

func (*LightChain) GetTdByHash 

func (self *LightChain) GetTdByHash(hash common.Hash) *big.Int

GetTdByHash retrieves a block's total difficulty in the canonical chain from the database by hash, caching it if found.

func (*LightChain) HasBlock 

func (bc *LightChain) HasBlock(hash common.Hash) bool

HasBlock checks if a block is fully present in the database or not, caching it if present.

func (*LightChain) HasHeader 

func (bc *LightChain) HasHeader(hash common.Hash) bool

HasHeader checks if a block header is present in the database or not, caching it if present.

func (*LightChain) InsertHeaderChain 

func (self *LightChain) InsertHeaderChain(chain []*types.Header, checkFreq int) (int, error)

InsertHeaderChain attempts to insert the given header chain in to the local chain, possibly creating a reorg. If an error is returned, it will return the index number of the failing header as well an error describing what went wrong.

The verify parameter can be used to fine tune whether nonce verification should be done or not. The reason behind the optional check is because some of the header retrieval mechanisms already need to verfy nonces, as well as because nonces can be verified sparsely, not needing to check each.

In the case of a light chain, InsertHeaderChain also creates and posts light chain events when necessary.

func (*LightChain) LastBlockHash 

func (self *LightChain) LastBlockHash() common.Hash

LastBlockHash return the hash of the HEAD block.

func (*LightChain) LockChain 

func (self *LightChain) LockChain()

LockChain locks the chain mutex for reading so that multiple canonical hashes can be retrieved while it is guaranteed that they belong to the same version of the chain

func (*LightChain) Odr 

func (self *LightChain) Odr() OdrBackend

Odr returns the ODR backend of the chain

func (*LightChain) Reset 

func (bc *LightChain) Reset()

Reset purges the entire blockchain, restoring it to its genesis state.

func (*LightChain) ResetWithGenesisBlock 

func (bc *LightChain) ResetWithGenesisBlock(genesis *types.Block)

ResetWithGenesisBlock purges the entire blockchain, restoring it to the specified genesis state.

func (*LightChain) Rollback 

func (self *LightChain) Rollback(chain []common.Hash)

Rollback is designed to remove a chain of links from the database that aren't certain enough to be valid.

func (*LightChain) SetHead 

func (bc *LightChain) SetHead(head uint64)

SetHead rewinds the local chain to a new head. Everything above the new head will be deleted and the new one set.

func (*LightChain) State 

func (self *LightChain) State() *LightState

State returns a new mutable state based on the current HEAD block.

func (*LightChain) Status 

func (self *LightChain) Status() (td *big.Int, currentBlock common.Hash, genesisBlock common.Hash)

Status returns status information about the current chain such as the HEAD Td, the HEAD hash and the hash of the genesis block.

func (*LightChain) Stop 

func (bc *LightChain) Stop()

Stop stops the blockchain service. If any imports are currently in progress it will abort them using the procInterrupt.

func (*LightChain) SyncCht 

func (self *LightChain) SyncCht(ctx context.Context) bool

func (*LightChain) UnlockChain 

func (self *LightChain) UnlockChain()

UnlockChain unlocks the chain mutex

type LightState 

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

LightState is a memory representation of a state. This version is ODR capable, caching only the already accessed part of the state, retrieving unknown parts on-demand from the ODR backend. Changes are never stored in the local database, only in the memory objects.

func NewLightState 

func NewLightState(id *TrieID, odr OdrBackend) *LightState

NewLightState creates a new LightState with the specified root. Note that the creation of a light state is always successful, even if the root is non-existent. In that case, ODR retrieval will always be unsuccessful and every operation will return with an error or wait for the context to be cancelled.

func (*LightState) AddBalance 

func (self *LightState) AddBalance(ctx context.Context, addr common.Address, amount *big.Int) error

AddBalance adds the given amount to the balance of the specified account

func (*LightState) AddRefund 

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

AddRefund adds an amount to the refund value collected during a vm execution

func (*LightState) Copy 

func (self *LightState) Copy() *LightState

Copy creates a copy of the state

func (*LightState) CreateStateObject 

func (self *LightState) CreateStateObject(ctx context.Context, addr common.Address) (*StateObject, error)

CreateStateObject creates creates a new state object and takes ownership. This is different from "NewStateObject"

func (*LightState) ForEachStorage 

func (self *LightState) ForEachStorage(ctx context.Context, addr common.Address, cb func(key, value common.Hash) bool) error

ForEachStorage calls a callback function for every key/value pair found in the local storage cache. Note that unlike core/state.StateObject, light.StateObject only returns cached values and doesn't download the entire storage tree.

func (*LightState) GetBalance 

func (self *LightState) GetBalance(ctx context.Context, addr common.Address) (*big.Int, error)

GetBalance retrieves the balance from the given address or 0 if the account does not exist

func (*LightState) GetCode 

func (self *LightState) GetCode(ctx context.Context, addr common.Address) ([]byte, error)

GetCode returns the contract code at the given address or nil if the account does not exist

func (*LightState) GetNonce 

func (self *LightState) GetNonce(ctx context.Context, addr common.Address) (uint64, error)

GetNonce returns the nonce at the given address or 0 if the account does not exist

func (*LightState) GetOrNewStateObject 

func (self *LightState) GetOrNewStateObject(ctx context.Context, addr common.Address) (*StateObject, error)

GetOrNewStateObject returns the state object of the given account or creates a new one if the account does not exist

func (*LightState) GetRefund 

func (self *LightState) GetRefund() *big.Int

GetRefund returns the refund value collected during a vm execution

func (*LightState) GetState 

func (self *LightState) GetState(ctx context.Context, a common.Address, b common.Hash) (common.Hash, error)

GetState returns the contract storage value at storage address b from the contract address a or common.Hash{} if the account does not exist

func (*LightState) GetStateObject 

func (self *LightState) GetStateObject(ctx context.Context, addr common.Address) (stateObject *StateObject, err error)

GetStateObject returns the state object of the given account or nil if the account does not exist

func (*LightState) HasAccount 

func (self *LightState) HasAccount(ctx context.Context, addr common.Address) (bool, error)

HasAccount returns true if an account exists at the given address

func (*LightState) HasSuicided 

func (self *LightState) HasSuicided(ctx context.Context, addr common.Address) (bool, error)

HasSuicided returns true if the given account has been marked for deletion or false if the account does not exist

func (*LightState) Set 

func (self *LightState) Set(state *LightState)

Set copies the contents of the given state onto this state, overwriting its contents

func (*LightState) SetCode 

func (self *LightState) SetCode(ctx context.Context, addr common.Address, code []byte) error

SetCode sets the contract code at the specified account

func (*LightState) SetNonce 

func (self *LightState) SetNonce(ctx context.Context, addr common.Address, nonce uint64) error

SetNonce sets the nonce of the specified account

func (*LightState) SetState 

func (self *LightState) SetState(ctx context.Context, addr common.Address, key common.Hash, value common.Hash) error

SetState sets the storage value at storage address key of the account addr

func (*LightState) SetStateObject 

func (self *LightState) SetStateObject(object *StateObject)

SetStateObject sets the state object of the given account

func (*LightState) SubBalance 

func (self *LightState) SubBalance(ctx context.Context, addr common.Address, amount *big.Int) error

SubBalance adds the given amount to the balance of the specified account

func (*LightState) Suicide 

func (self *LightState) Suicide(ctx context.Context, addr common.Address) (bool, error)

Delete marks an account to be removed and clears its balance

type LightTrie 

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

LightTrie is an ODR-capable wrapper around trie.SecureTrie

func NewLightTrie 

func NewLightTrie(id *TrieID, odr OdrBackend, useFakeMap bool) *LightTrie

NewLightTrie creates a new LightTrie instance. It doesn't instantly try to access the db or network and retrieve the root node, it only initializes its encapsulated SecureTrie at the first actual operation.

func (*LightTrie) Delete 

func (t *LightTrie) Delete(ctx context.Context, key []byte) (err error)

Delete removes any existing value for key from the trie.

func (*LightTrie) Get 

func (t *LightTrie) Get(ctx context.Context, key []byte) (res []byte, err error)

Get returns the value for key stored in the trie. The value bytes must not be modified by the caller.

func (*LightTrie) Update 

func (t *LightTrie) Update(ctx context.Context, key, value []byte) (err error)

Update associates key with value in the trie. Subsequent calls to Get will return value. If value has length zero, any existing value is deleted from the trie and calls to Get will return nil.

The value bytes must not be modified by the caller while they are stored in the trie.

type OdrBackend 

type OdrBackend interface {
	Database() ethdb.Database
	Retrieve(ctx context.Context, req OdrRequest) error
}

OdrBackend is an interface to a backend service that handles ODR retrievals

type OdrRequest 

type OdrRequest interface {
	StoreResult(db ethdb.Database)
}

OdrRequest is an interface for retrieval requests

type ReceiptsRequest 

type ReceiptsRequest struct {
	OdrRequest
	Hash     common.Hash
	Number   uint64
	Receipts types.Receipts
}

ReceiptsRequest is the ODR request type for retrieving block bodies

func (*ReceiptsRequest) StoreResult 

func (req *ReceiptsRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type StateObject 

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

StateObject is a memory representation of an account or contract and its storage. This version is ODR capable, caching only the already accessed part of the storage, retrieving unknown parts on-demand from the ODR backend. Changes are never stored in the local database, only in the memory objects.

func DecodeObject 

func DecodeObject(ctx context.Context, stateID *TrieID, address common.Address, odr OdrBackend, data []byte) (*StateObject, error)

DecodeObject decodes an RLP-encoded state object.

func NewStateObject 

func NewStateObject(address common.Address, odr OdrBackend) *StateObject

NewStateObject creates a new StateObject of the specified account address

func (*StateObject) AddBalance 

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

AddBalance adds the given amount to the account balance

func (*StateObject) Address 

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

Address returns the address of the contract/account

func (*StateObject) Balance 

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

Balance returns the account balance

func (*StateObject) Code 

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

Code returns the contract code

func (*StateObject) Copy 

func (self *StateObject) Copy() *StateObject

Copy creates a copy of the state object

func (*StateObject) ForEachStorage 

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

ForEachStorage calls a callback function for every key/value pair found in the local storage cache. Note that unlike core/state.StateObject, light.StateObject only returns cached values and doesn't download the entire storage tree.

func (*StateObject) GetState 

func (self *StateObject) GetState(ctx context.Context, key common.Hash) (common.Hash, error)

GetState returns the storage value at the given address from either the cache or the trie

func (*StateObject) MarkForDeletion 

func (self *StateObject) MarkForDeletion()

MarkForDeletion marks an account to be removed

func (*StateObject) Nonce 

func (self *StateObject) Nonce() uint64

Nonce returns the account nonce

func (*StateObject) ReturnGas 

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

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

func (*StateObject) SetBalance 

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

SetBalance sets the account balance to the given amount

func (*StateObject) SetCode 

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

SetCode sets the contract code

func (*StateObject) SetNonce 

func (self *StateObject) SetNonce(nonce uint64)

SetNonce sets the account nonce

func (*StateObject) SetState 

func (self *StateObject) SetState(k, value common.Hash)

SetState sets the storage value at the given address

func (*StateObject) Storage 

func (self *StateObject) Storage() Storage

Storage returns the storage cache object of the account

func (*StateObject) SubBalance 

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

SubBalance subtracts the given amount from the account balance

func (*StateObject) Value 

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

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

type Storage 

type Storage map[common.Hash]common.Hash

Storage is a memory map cache of a contract storage

func (Storage) Copy 

func (self Storage) Copy() Storage

Copy copies the contents of a storage cache

func (Storage) String 

func (self Storage) String() (str string)

String returns a string representation of the storage cache

type TrieID 

type TrieID struct {
	BlockHash, Root common.Hash
	BlockNumber     uint64
	AccKey          []byte
}

TrieID identifies a state or account storage trie

func StateTrieID 

func StateTrieID(header *types.Header) *TrieID

StateTrieID returns a TrieID for a state trie belonging to a certain block header.

func StorageTrieID 

func StorageTrieID(state *TrieID, addr common.Address, root common.Hash) *TrieID

StorageTrieID returns a TrieID for a contract storage trie at a given account of a given state trie. It also requires the root hash of the trie for checking Merkle proofs.

type TrieRequest 

type TrieRequest struct {
	OdrRequest
	Id    *TrieID
	Key   []byte
	Proof []rlp.RawValue
}

TrieRequest is the ODR request type for state/storage trie entries

func (*TrieRequest) StoreResult 

func (req *TrieRequest) StoreResult(db ethdb.Database)

StoreResult stores the retrieved data in local database

type TrustedCht 

type TrustedCht struct {
	Number uint64
	Root   common.Hash
}

func GetTrustedCht 

func GetTrustedCht(db ethdb.Database) TrustedCht

type TxPool 

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

TxPool implements the transaction pool for light clients, which keeps track of the status of locally created transactions, detecting if they are included in a block (mined) or rolled back. There are no queued transactions since we always receive all locally signed transactions in the same order as they are created.

func NewTxPool 

func NewTxPool(config *params.ChainConfig, eventMux *event.TypeMux, chain *LightChain, relay TxRelayBackend) *TxPool

NewTxPool creates a new light transaction pool

func (*TxPool) Add 

func (self *TxPool) Add(ctx context.Context, tx *types.Transaction) error

Add adds a transaction to the pool if valid and passes it to the tx relay backend

func (*TxPool) AddBatch 

func (self *TxPool) AddBatch(ctx context.Context, txs []*types.Transaction)

AddTransactions adds all valid transactions to the pool and passes them to the tx relay backend

func (*TxPool) Content 

func (self *TxPool) Content() (map[common.Address]types.Transactions, map[common.Address]types.Transactions)

Content retrieves the data content of the transaction pool, returning all the pending as well as queued transactions, grouped by account and nonce.

func (*TxPool) GetNonce 

func (pool *TxPool) GetNonce(ctx context.Context, addr common.Address) (uint64, error)

GetNonce returns the "pending" nonce of a given address. It always queries the nonce belonging to the latest header too in order to detect if another client using the same key sent a transaction.

func (*TxPool) GetTransaction 

func (tp *TxPool) GetTransaction(hash common.Hash) *types.Transaction

GetTransaction returns a transaction if it is contained in the pool and nil otherwise.

func (*TxPool) GetTransactions 

func (self *TxPool) GetTransactions() (txs types.Transactions, err error)

GetTransactions returns all currently processable transactions. The returned slice may be modified by the caller.

func (*TxPool) RemoveTransactions 

func (self *TxPool) RemoveTransactions(txs types.Transactions)

RemoveTransactions removes all given transactions from the pool.

func (*TxPool) RemoveTx 

func (pool *TxPool) RemoveTx(hash common.Hash)

RemoveTx removes the transaction with the given hash from the pool.

func (*TxPool) Stats 

func (pool *TxPool) Stats() (pending int)

Stats returns the number of currently pending (locally created) transactions

func (*TxPool) Stop 

func (pool *TxPool) Stop()

Stop stops the light transaction pool

type TxRelayBackend 

type TxRelayBackend interface {
	Send(txs types.Transactions)
	NewHead(head common.Hash, mined []common.Hash, rollback []common.Hash)
	Discard(hashes []common.Hash)
}

TxRelayBackend provides an interface to the mechanism that forwards transacions to the ETH network. The implementations of the functions should be non-blocking.

Send instructs backend to forward new transactions NewHead notifies backend about a new head after processed by the tx pool, 

including  mined and rolled back transactions since the last event

Discard notifies backend about transactions that should be discarded either 

because they have been replaced by a re-send or because they have been mined
long ago and no rollback is expected

type VMState 

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

VMState is a wrapper for the light state that holds the actual context and passes it to any state operation that requires it.

func NewVMState 

func NewVMState(ctx context.Context, state *LightState) *VMState

func (*VMState) AddBalance 

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

AddBalance adds the given amount to the balance of the specified account

func (*VMState) AddLog 

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

func (*VMState) AddPreimage 

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

func (*VMState) AddRefund 

func (s *VMState) AddRefund(gas *big.Int)

AddRefund adds an amount to the refund value collected during a vm execution

func (*VMState) CreateAccount 

func (s *VMState) CreateAccount(addr common.Address)

CreateAccount creates creates a new account object and takes ownership.

func (*VMState) Empty 

func (s *VMState) Empty(addr common.Address) bool

Empty returns true if the account at the given address is considered empty

func (*VMState) Error 

func (s *VMState) Error() error

func (*VMState) Exist 

func (s *VMState) Exist(addr common.Address) bool

Exist returns true if an account exists at the given address

func (*VMState) ForEachStorage 

func (s *VMState) ForEachStorage(addr common.Address, cb func(key, value common.Hash) bool)

ForEachStorage calls a callback function for every key/value pair found in the local storage cache. Note that unlike core/state.StateObject, light.StateObject only returns cached values and doesn't download the entire storage tree.

func (*VMState) GetBalance 

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

GetBalance retrieves the balance from the given address or 0 if the account does not exist

func (*VMState) GetCode 

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

GetCode returns the contract code at the given address or nil if the account does not exist

func (*VMState) GetCodeHash 

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

GetCodeHash returns the contract code hash at the given address

func (*VMState) GetCodeSize 

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

GetCodeSize returns the contract code size at the given address

func (*VMState) GetNonce 

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

GetNonce returns the nonce at the given address or 0 if the account does not exist

func (*VMState) GetRefund 

func (s *VMState) GetRefund() *big.Int

GetRefund returns the refund value collected during a vm execution

func (*VMState) GetState 

func (s *VMState) GetState(a common.Address, b common.Hash) common.Hash

GetState returns the contract storage value at storage address b from the contract address a or common.Hash{} if the account does not exist

func (*VMState) HasSuicided 

func (s *VMState) HasSuicided(addr common.Address) bool

HasSuicided returns true if the given account has been marked for deletion or false if the account does not exist

func (*VMState) RevertToSnapshot 

func (self *VMState) RevertToSnapshot(idx int)

func (*VMState) SetCode 

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

SetCode sets the contract code at the specified account

func (*VMState) SetNonce 

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

SetNonce sets the nonce of the specified account

func (*VMState) SetState 

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

SetState sets the storage value at storage address key of the account addr

func (*VMState) Snapshot 

func (self *VMState) Snapshot() int

func (*VMState) SubBalance 

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

SubBalance adds the given amount to the balance of the specified account

func (*VMState) Suicide 

func (s *VMState) Suicide(addr common.Address) bool

Suicide marks an account to be removed and clears its balance

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