light

package
v1.4.18 Latest Latest
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 Go to latest Published: Oct 15, 2016 License: GPL-3.0 Imports: 11 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 StartingNonce uint64

StartingNonce determines the default nonce when new accounts are being created.

Functions

This section is empty.

Types

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 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(root common.Hash, 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) 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) Delete 

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

Delete marks an account to be removed and clears its balance

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) 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) IsDeleted 

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

IsDeleted 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

type LightTrie 

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

LightTrie is an ODR-capable wrapper around trie.SecureTrie

func NewLightTrie 

func NewLightTrie(root common.Hash, 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 NodeDataRequest 

type NodeDataRequest struct {
	OdrRequest
	// contains filtered or unexported fields
}

NodeDataRequest is the ODR request type for node data (used for retrieving contract code)

func (*NodeDataRequest) GetData 

func (req *NodeDataRequest) GetData() []byte

GetData returns the retrieved node data after a successful request

func (*NodeDataRequest) StoreResult 

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

StoreResult stores the retrieved data in local database

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 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, 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 (c *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) 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) SetBalance 

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

SetBalance sets the account balance to the given amount

func (*StateObject) SetCode 

func (self *StateObject) SetCode(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

type Storage 

type Storage map[string]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 TrieRequest 

type TrieRequest struct {
	OdrRequest
	// contains filtered or unexported fields
}

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

Source Files

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