From 9008b155d3c8d2a32c4c8945f1174243d48d4e90 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Thu, 4 Dec 2014 10:28:02 +0100
Subject: Renamed `chain` => `core`

---
 chain/state_transition.go | 198 ----------------------------------------------
 1 file changed, 198 deletions(-)
 delete mode 100644 chain/state_transition.go

(limited to 'chain/state_transition.go')

diff --git a/chain/state_transition.go b/chain/state_transition.go
deleted file mode 100644
index b2ba4f22a..000000000
--- a/chain/state_transition.go
+++ /dev/null
@@ -1,198 +0,0 @@
-package chain
-
-import (
-	"fmt"
-	"math/big"
-
-	"github.com/ethereum/go-ethereum/chain/types"
-	"github.com/ethereum/go-ethereum/state"
-	"github.com/ethereum/go-ethereum/vm"
-)
-
-/*
- * The State transitioning model
- *
- * A state transition is a change made when a transaction is applied to the current world state
- * The state transitioning model does all all the necessary work to work out a valid new state root.
- * 1) Nonce handling
- * 2) Pre pay / buy gas of the coinbase (miner)
- * 3) Create a new state object if the recipient is \0*32
- * 4) Value transfer
- * == If contract creation ==
- * 4a) Attempt to run transaction data
- * 4b) If valid, use result as code for the new state object
- * == end ==
- * 5) Run Script section
- * 6) Derive new state root
- */
-type StateTransition struct {
-	coinbase, receiver []byte
-	tx                 *types.Transaction
-	gas, gasPrice      *big.Int
-	value              *big.Int
-	data               []byte
-	state              *state.State
-	block              *types.Block
-
-	cb, rec, sen *state.StateObject
-}
-
-func NewStateTransition(coinbase *state.StateObject, tx *types.Transaction, state *state.State, block *types.Block) *StateTransition {
-	return &StateTransition{coinbase.Address(), tx.Recipient, tx, new(big.Int), new(big.Int).Set(tx.GasPrice), tx.Value, tx.Data, state, block, coinbase, nil, nil}
-}
-
-func (self *StateTransition) Coinbase() *state.StateObject {
-	if self.cb != nil {
-		return self.cb
-	}
-
-	self.cb = self.state.GetOrNewStateObject(self.coinbase)
-	return self.cb
-}
-func (self *StateTransition) Sender() *state.StateObject {
-	if self.sen != nil {
-		return self.sen
-	}
-
-	self.sen = self.state.GetOrNewStateObject(self.tx.Sender())
-
-	return self.sen
-}
-func (self *StateTransition) Receiver() *state.StateObject {
-	if self.tx != nil && self.tx.CreatesContract() {
-		return nil
-	}
-
-	if self.rec != nil {
-		return self.rec
-	}
-
-	self.rec = self.state.GetOrNewStateObject(self.tx.Recipient)
-	return self.rec
-}
-
-func (self *StateTransition) UseGas(amount *big.Int) error {
-	if self.gas.Cmp(amount) < 0 {
-		return OutOfGasError()
-	}
-	self.gas.Sub(self.gas, amount)
-
-	return nil
-}
-
-func (self *StateTransition) AddGas(amount *big.Int) {
-	self.gas.Add(self.gas, amount)
-}
-
-func (self *StateTransition) BuyGas() error {
-	var err error
-
-	sender := self.Sender()
-	if sender.Balance().Cmp(self.tx.GasValue()) < 0 {
-		return fmt.Errorf("Insufficient funds to pre-pay gas. Req %v, has %v", self.tx.GasValue(), sender.Balance())
-	}
-
-	coinbase := self.Coinbase()
-	err = coinbase.BuyGas(self.tx.Gas, self.tx.GasPrice)
-	if err != nil {
-		return err
-	}
-
-	self.AddGas(self.tx.Gas)
-	sender.SubAmount(self.tx.GasValue())
-
-	return nil
-}
-
-func (self *StateTransition) RefundGas() {
-	coinbase, sender := self.Coinbase(), self.Sender()
-	coinbase.RefundGas(self.gas, self.tx.GasPrice)
-
-	// Return remaining gas
-	remaining := new(big.Int).Mul(self.gas, self.tx.GasPrice)
-	sender.AddAmount(remaining)
-}
-
-func (self *StateTransition) preCheck() (err error) {
-	var (
-		tx     = self.tx
-		sender = self.Sender()
-	)
-
-	// Make sure this transaction's nonce is correct
-	if sender.Nonce != tx.Nonce {
-		return NonceError(tx.Nonce, sender.Nonce)
-	}
-
-	// Pre-pay gas / Buy gas of the coinbase account
-	if err = self.BuyGas(); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (self *StateTransition) TransitionState() (err error) {
-	statelogger.Debugf("(~) %x\n", self.tx.Hash())
-
-	// XXX Transactions after this point are considered valid.
-	if err = self.preCheck(); err != nil {
-		return
-	}
-
-	var (
-		tx       = self.tx
-		sender   = self.Sender()
-		receiver *state.StateObject
-	)
-
-	defer self.RefundGas()
-
-	// Increment the nonce for the next transaction
-	sender.Nonce += 1
-
-	// Transaction gas
-	if err = self.UseGas(vm.GasTx); err != nil {
-		return
-	}
-
-	// Pay data gas
-	var dgas int64
-	for _, byt := range self.data {
-		if byt != 0 {
-			dgas += vm.GasData.Int64()
-		} else {
-			dgas += 1 // This is 1/5. If GasData changes this fails
-		}
-	}
-	if err = self.UseGas(big.NewInt(dgas)); err != nil {
-		return
-	}
-
-	var ret []byte
-	vmenv := NewEnv(self.state, self.tx, self.block)
-	var ref vm.ClosureRef
-	if tx.CreatesContract() {
-		self.rec = MakeContract(tx, self.state)
-
-		ret, err, ref = vmenv.Create(sender, receiver.Address(), self.tx.Data, self.gas, self.gasPrice, self.value)
-		ref.SetCode(ret)
-	} else {
-		ret, err = vmenv.Call(self.Sender(), self.Receiver().Address(), self.tx.Data, self.gas, self.gasPrice, self.value)
-	}
-	if err != nil {
-		statelogger.Debugln(err)
-	}
-
-	return
-}
-
-// Converts an transaction in to a state object
-func MakeContract(tx *types.Transaction, state *state.State) *state.StateObject {
-	addr := tx.CreationAddress(state)
-
-	contract := state.GetOrNewStateObject(addr)
-	contract.InitCode = tx.Data
-
-	return contract
-}
-- 
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