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path: root/ethchain/state_object.go
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package ethchain

import (
    "fmt"
    "github.com/ethereum/eth-go/ethutil"
    "math/big"
)

type StateObject struct {
    // Address of the object
    address []byte
    // Shared attributes
    Amount *big.Int
    Nonce  uint64
    // Contract related attributes
    state      *State
    script     []byte
    initScript []byte
}

// Converts an transaction in to a state object
func MakeContract(tx *Transaction, state *State) *StateObject {
    // Create contract if there's no recipient
    if tx.IsContract() {
        // FIXME
        addr := tx.Hash()[12:]

        value := tx.Value
        contract := NewContract(addr, value, []byte(""))
        state.UpdateStateObject(contract)

        contract.script = tx.Data
        contract.initScript = tx.Init

        state.UpdateStateObject(contract)

        return contract
    }

    return nil
}

func NewContract(address []byte, Amount *big.Int, root []byte) *StateObject {
    contract := &StateObject{address: address, Amount: Amount, Nonce: 0}
    contract.state = NewState(ethutil.NewTrie(ethutil.Config.Db, string(root)))

    return contract
}

// Returns a newly created account
func NewAccount(address []byte, amount *big.Int) *StateObject {
    account := &StateObject{address: address, Amount: amount, Nonce: 0}

    return account
}

func NewStateObjectFromBytes(address, data []byte) *StateObject {
    object := &StateObject{address: address}
    object.RlpDecode(data)

    return object
}

func (c *StateObject) State() *State {
    return c.state
}

func (c *StateObject) N() *big.Int {
    return big.NewInt(int64(c.Nonce))
}

func (c *StateObject) Addr(addr []byte) *ethutil.Value {
    return ethutil.NewValueFromBytes([]byte(c.state.trie.Get(string(addr))))
}

func (c *StateObject) SetAddr(addr []byte, value interface{}) {
    c.state.trie.Update(string(addr), string(ethutil.NewValue(value).Encode()))
}

func (c *StateObject) SetMem(num *big.Int, val *ethutil.Value) {
    addr := ethutil.BigToBytes(num, 256)
    c.SetAddr(addr, val)
}

func (c *StateObject) GetMem(num *big.Int) *ethutil.Value {
    nb := ethutil.BigToBytes(num, 256)

    return c.Addr(nb)
}

func (c *StateObject) GetInstr(pc *big.Int) *ethutil.Value {
    if int64(len(c.script)-1) < pc.Int64() {
        return ethutil.NewValue(0)
    }

    return ethutil.NewValueFromBytes([]byte{c.script[pc.Int64()]})
}

// Return the gas back to the origin. Used by the Virtual machine or Closures
func (c *StateObject) ReturnGas(gas, price *big.Int, state *State) {
    remainder := new(big.Int).Mul(gas, price)
    c.AddAmount(remainder)
}

func (c *StateObject) AddAmount(amount *big.Int) {
    c.SetAmount(new(big.Int).Add(c.Amount, amount))
}

func (c *StateObject) SubAmount(amount *big.Int) {
    c.SetAmount(new(big.Int).Sub(c.Amount, amount))
}

func (c *StateObject) SetAmount(amount *big.Int) {
    c.Amount = amount
}

func (c *StateObject) ConvertGas(gas, price *big.Int) error {
    total := new(big.Int).Mul(gas, price)
    if total.Cmp(c.Amount) > 0 {
        return fmt.Errorf("insufficient amount: %v, %v", c.Amount, total)
    }

    c.SubAmount(total)

    return nil
}

// Returns the address of the contract/account
func (c *StateObject) Address() []byte {
    return c.address
}

// Returns the main script body
func (c *StateObject) Script() []byte {
    return c.script
}

// Returns the initialization script
func (c *StateObject) Init() []byte {
    return c.initScript
}

// State object encoding methods
func (c *StateObject) RlpEncode() []byte {
    var root interface{}
    if c.state != nil {
        root = c.state.trie.Root
    } else {
        root = nil
    }
    return ethutil.Encode([]interface{}{c.Amount, c.Nonce, root, c.script})
}

func (c *StateObject) RlpDecode(data []byte) {
    decoder := ethutil.NewValueFromBytes(data)

    c.Amount = decoder.Get(0).BigInt()
    c.Nonce = decoder.Get(1).Uint()
    c.state = NewState(ethutil.NewTrie(ethutil.Config.Db, decoder.Get(2).Interface()))
    c.script = decoder.Get(3).Bytes()
}

// The cached state and state object cache are helpers which will give you somewhat
// control over the nonce. When creating new transactions you're interested in the 'next'
// nonce rather than the current nonce. This to avoid creating invalid-nonce transactions.
type StateObjectCache struct {
    cachedObjects map[string]*CachedStateObject
}

func NewStateObjectCache() *StateObjectCache {
    return &StateObjectCache{cachedObjects: make(map[string]*CachedStateObject)}
}

func (s *StateObjectCache) Add(addr []byte, object *StateObject) *CachedStateObject {
    state := &CachedStateObject{Nonce: object.Nonce, Object: object}
    s.cachedObjects[string(addr)] = state

    return state
}

func (s *StateObjectCache) Get(addr []byte) *CachedStateObject {
    return s.cachedObjects[string(addr)]
}

type CachedStateObject struct {
    Nonce  uint64
    Object *StateObject
}

type StorageState struct {
    StateAddress []byte
    Address      []byte
    Value        *big.Int
}