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path: root/ethchain/contract.go
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package ethchain

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

type Contract struct {
    Amount *big.Int
    Nonce  uint64
    //state  *ethutil.Trie
    state      *State
    address    []byte
    script     []byte
    initScript []byte
}

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

    return contract
}

func NewContractFromBytes(address, data []byte) *Contract {
    contract := &Contract{address: address}
    contract.RlpDecode(data)

    return contract
}

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

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

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

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

    return c.Addr(nb)
}

func (c *Contract) 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()]})
}

func (c *Contract) SetMem(num *big.Int, val *ethutil.Value) {
    addr := ethutil.BigToBytes(num, 256)
    c.state.trie.Update(string(addr), string(val.Encode()))
}

// Return the gas back to the origin. Used by the Virtual machine or Closures
func (c *Contract) ReturnGas(val *big.Int, state *State) {
    c.Amount.Add(c.Amount, val)
}

func (c *Contract) Address() []byte {
    return c.address
}

func (c *Contract) RlpEncode() []byte {
    return ethutil.Encode([]interface{}{c.Amount, c.Nonce, c.state.trie.Root, c.script, c.initScript})
}

func (c *Contract) 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()
    c.initScript = decoder.Get(4).Bytes()
}

func MakeContract(tx *Transaction, state *State) *Contract {
    // Create contract if there's no recipient
    if tx.IsContract() {
        addr := tx.Hash()[12:]

        value := tx.Value
        contract := NewContract(addr, value, []byte(""))
        state.trie.Update(string(addr), string(contract.RlpEncode()))
        contract.script = tx.Data
        contract.initScript = tx.Init

        /*
            for i, val := range tx.Data {
                    if len(val) > 0 {
                        bytNum := ethutil.BigToBytes(big.NewInt(int64(i)), 256)
                        contract.state.trie.Update(string(bytNum), string(ethutil.Encode(val)))
                    }
            }
        */
        state.trie.Update(string(addr), string(contract.RlpEncode()))

        return contract
    }

    return nil
}