state

Documentation

Overview

Package state manages the main accounts trie. It follows the flow as bellow:

         o
         |
[ revertable state ]
         |
  [ stacked map ] -> [ journal ] -> [ playback(staging) ] -> [ updated trie ]
         |
   [ trie cache ]
         |
  [ read-only trie ]

It's much simpler than Ethereum's statedb. An important difference with statedb is the logic of account suicide. TODO: explain more

Index

• type Account
  • func (a *Account) CalcEnergy(blockTime uint64) *big.Int
  • func (a *Account) IsEmpty() bool
• type Creator
  • func NewCreator(kv kv.GetPutter) *Creator
  • func (c *Creator) NewState(root powerplay.Bytes32) (*State, error)
• type Stage
  • func (s *Stage) Commit() (powerplay.Bytes32, error)
  • func (s *Stage) Hash() (powerplay.Bytes32, error)
• type State
  • func New(root powerplay.Bytes32, kv kv.GetPutter) (*State, error)
  • func (s *State) BuildStorageTrie(addr powerplay.Address) (*trie.SecureTrie, error)
  • func (s *State) DecodeStorage(addr powerplay.Address, key powerplay.Bytes32, dec func([]byte) error)
  • func (s *State) Delete(addr powerplay.Address)
  • func (s *State) EncodeStorage(addr powerplay.Address, key powerplay.Bytes32, enc func() ([]byte, error))
  • func (s *State) Err() error
  • func (s *State) Exists(addr powerplay.Address) bool
  • func (s *State) GetBalance(addr powerplay.Address) *big.Int
  • func (s *State) GetCode(addr powerplay.Address) []byte
  • func (s *State) GetCodeHash(addr powerplay.Address) powerplay.Bytes32
  • func (s *State) GetEnergy(addr powerplay.Address, blockTime uint64) *big.Int
  • func (s *State) GetMaster(addr powerplay.Address) powerplay.Address
  • func (s *State) GetRawStorage(addr powerplay.Address, key powerplay.Bytes32) rlp.RawValue
  • func (s *State) GetStorage(addr powerplay.Address, key powerplay.Bytes32) powerplay.Bytes32
  • func (s *State) NewCheckpoint() int
  • func (s *State) RevertTo(revision int)
  • func (s *State) SetBalance(addr powerplay.Address, balance *big.Int)
  • func (s *State) SetCode(addr powerplay.Address, code []byte)
  • func (s *State) SetEnergy(addr powerplay.Address, energy *big.Int, blockTime uint64)
  • func (s *State) SetMaster(addr powerplay.Address, master powerplay.Address)
  • func (s *State) SetRawStorage(addr powerplay.Address, key powerplay.Bytes32, raw rlp.RawValue)
  • func (s *State) SetStorage(addr powerplay.Address, key, value powerplay.Bytes32)
  • func (s *State) Spawn(root powerplay.Bytes32) *State
  • func (s *State) Stage() *Stage

Types

type Account

type Account struct {
	Balance     *big.Int
	Energy      *big.Int
	BlockTime   uint64
	Master      []byte // master address
	CodeHash    []byte // hash of code
	StorageRoot []byte // merkle root of the storage trie
}

Account is the PowerPlay consensus representation of an account. RLP encoded objects are stored in main account trie.

func (*Account) CalcEnergy

func (a *Account) CalcEnergy(blockTime uint64) *big.Int

CalcEnergy calculates energy based on current block time.

func (*Account) IsEmpty

func (a *Account) IsEmpty() bool

IsEmpty returns if an account is empty. An empty account has zero balance and zero length code hash.

type Creator

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

Creator state creator to cut-off kv dependency.

func NewCreator

func NewCreator(kv kv.GetPutter) *Creator

NewCreator create a new state creator.

func (*Creator) NewState

func (c *Creator) NewState(root powerplay.Bytes32) (*State, error)

NewState create a new state object.

type Stage

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

Stage abstracts changes on the main accounts trie.

func (*Stage) Commit

func (s *Stage) Commit() (powerplay.Bytes32, error)

Commit commits all changes into main accounts trie and storage tries.

func (*Stage) Hash

func (s *Stage) Hash() (powerplay.Bytes32, error)

Hash computes hash of the main accounts trie.

type State

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

State manages the main accounts trie.

func New

func New(root powerplay.Bytes32, kv kv.GetPutter) (*State, error)

New create an state object.

func (*State) BuildStorageTrie

func (s *State) BuildStorageTrie(addr powerplay.Address) (*trie.SecureTrie, error)

BuildStorageTrie build up storage trie for given address with cumulative changes.

func (*State) DecodeStorage

func (s *State) DecodeStorage(addr powerplay.Address, key powerplay.Bytes32, dec func([]byte) error)

DecodeStorage get and decode storage value. Error returned by dec will be absorbed by State instance.

func (*State) Delete

func (s *State) Delete(addr powerplay.Address)

Delete delete an account at the given address. That's set balance, energy and code to zero value.

func (*State) EncodeStorage

func (s *State) EncodeStorage(addr powerplay.Address, key powerplay.Bytes32, enc func() ([]byte, error))

EncodeStorage set storage value encoded by given enc method. Error returned by end will be absorbed by State instance.

func (*State) Err

func (s *State) Err() error

Err returns first occurred error.

func (*State) Exists

func (s *State) Exists(addr powerplay.Address) bool

Exists returns whether an account exists at the given address. See Account.IsEmpty()

func (*State) GetBalance

func (s *State) GetBalance(addr powerplay.Address) *big.Int

GetBalance returns balance for the given address.

func (*State) GetCode

func (s *State) GetCode(addr powerplay.Address) []byte

GetCode returns code for the given address.

func (*State) GetCodeHash

func (s *State) GetCodeHash(addr powerplay.Address) powerplay.Bytes32

GetCodeHash returns code hash for the given address.

func (*State) GetEnergy

func (s *State) GetEnergy(addr powerplay.Address, blockTime uint64) *big.Int

GetEnergy get energy for the given address at block number specified.

func (*State) GetMaster

func (s *State) GetMaster(addr powerplay.Address) powerplay.Address

GetMaster get master for the given address. Master can move energy, manage users...

func (*State) GetRawStorage

func (s *State) GetRawStorage(addr powerplay.Address, key powerplay.Bytes32) rlp.RawValue

GetRawStorage returns storage value in rlp raw for given address and key.

func (*State) GetStorage

func (s *State) GetStorage(addr powerplay.Address, key powerplay.Bytes32) powerplay.Bytes32

GetStorage returns storage value for the given address and key.

func (*State) NewCheckpoint

func (s *State) NewCheckpoint() int

NewCheckpoint makes a checkpoint of current state. It returns revision of the checkpoint.

func (*State) RevertTo

func (s *State) RevertTo(revision int)

RevertTo revert to checkpoint specified by revision.

func (*State) SetBalance

func (s *State) SetBalance(addr powerplay.Address, balance *big.Int)

SetBalance set balance for the given address.

func (*State) SetCode

func (s *State) SetCode(addr powerplay.Address, code []byte)

SetCode set code for the given address.

func (*State) SetEnergy

func (s *State) SetEnergy(addr powerplay.Address, energy *big.Int, blockTime uint64)

SetEnergy set energy at block number for the given address.

func (*State) SetMaster

func (s *State) SetMaster(addr powerplay.Address, master powerplay.Address)

SetMaster set master for the given address.

func (*State) SetRawStorage

func (s *State) SetRawStorage(addr powerplay.Address, key powerplay.Bytes32, raw rlp.RawValue)

SetRawStorage set storage value in rlp raw.

func (*State) SetStorage

func (s *State) SetStorage(addr powerplay.Address, key, value powerplay.Bytes32)

SetStorage set storage value for the given address and key.

func (*State) Spawn

func (s *State) Spawn(root powerplay.Bytes32) *State

Spawn create a new state object shares current state's underlying db. Also errors will be reported to current state.

func (*State) Stage

func (s *State) Stage() *Stage

Stage makes a stage object to compute hash of trie or commit all changes.