path: root/ethchain/contract.go

package ethchain

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

type Contract struct {
    Amount *big.Int
    Nonce  uint64
    //state  *ethutil.Trie
    state *State
}

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

    return contract
}

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

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()))
}

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 int) *ethutil.Value {
    nb := ethutil.BigToBytes(big.NewInt(int64(num)), 256)

    return c.Addr(nb)
}

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(value, []byte(""))
        state.trie.Update(string(addr), string(contract.RlpEncode()))
        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
}