Implemented POST

ethchain/state_transition.go

@@ -278,6 +278,15 @@ func (self *StateTransition) Eval(msg *ethstate.Message, script []byte, context
 
 	ret, _, err = callerClosure.Call(vm, self.tx.Data)
 
+	if err == nil {
+		// Execute POSTs
+		for e := vm.Queue().Front(); e != nil; e = e.Next() {
+			msg := e.Value.(*ethvm.Message)
+
+			msg.Exec(transactor)
+		}
+	}
+
 	return
 }
 

ethstate/state_object.go

@@ -245,6 +245,7 @@ func (self *StateObject) Copy() *StateObject {
 	stateObject.InitCode = ethutil.CopyBytes(self.InitCode)
 	stateObject.storage = self.storage.Copy()
 	stateObject.gasPool.Set(self.gasPool)
+	stateObject.remove = self.remove
 
 	return stateObject
 }
@@ -271,6 +272,11 @@ func (c *StateObject) Init() Code {
 	return c.InitCode
 }
 
+// To satisfy ClosureRef
+func (self *StateObject) Object() *StateObject {
+	return self
+}
+
 // Debug stuff
 func (self *StateObject) CreateOutputForDiff() {
 	fmt.Printf("%x %x %x %x\n", self.Address(), self.State.Root(), self.Balance.Bytes(), self.Nonce)

ethvm/closure.go

@@ -12,6 +12,7 @@ import (
 type ClosureRef interface {
 	ReturnGas(*big.Int, *big.Int)
 	Address() []byte
+	Object() *ethstate.StateObject
 	GetStorage(*big.Int) *ethutil.Value
 	SetStorage(*big.Int, *ethutil.Value)
 }

ethvm/types.go

@@ -145,6 +145,7 @@ const (
 	CREATE = 0xf0
 	CALL   = 0xf1
 	RETURN = 0xf2
+	POST   = 0xf3
 
 	// 0x70 range - other
 	LOG     = 0xfe // XXX Unofficial
@@ -438,6 +439,7 @@ var OpCodes = map[string]byte{
 	"CREATE": 0xf0,
 	"CALL":   0xf1,
 	"RETURN": 0xf2,
+	"POST":   0xf3,
 
 	// 0x70 range - other
 	"LOG":     0xfe,

ethvm/vm.go

@@ -1,6 +1,7 @@
 package ethvm
 
 import (
+	"container/list"
 	"fmt"
 	"math"
 	"math/big"
@@ -18,11 +19,6 @@ type Debugger interface {
 }
 
 type Vm struct {
-	// Stack for processing contracts
-	stack *Stack
-	// non-persistent key/value memory storage
-	mem map[string]*big.Int
-
 	env Environment
 
 	Verbose bool
@@ -40,6 +36,8 @@ type Vm struct {
 	Fn          string
 
 	Recoverable bool
+
+	queue *list.List
 }
 
 type Environment interface {
@@ -66,7 +64,7 @@ func New(env Environment) *Vm {
 		lt = LogTyDiff
 	}
 
-	return &Vm{env: env, logTy: lt, Recoverable: true}
+	return &Vm{env: env, logTy: lt, Recoverable: true, queue: list.New()}
 }
 
 func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
@@ -215,6 +213,7 @@ func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
 			newMemSize = stack.data[stack.Len()-2].Uint64() + stack.data[stack.Len()-3].Uint64()
 		}
 
+		// BUG This will break on overflows. https://github.com/ethereum/eth-go/issues/47
 		newMemSize = (newMemSize + 31) / 32 * 32
 		if newMemSize > uint64(mem.Len()) {
 			m := GasMemory.Uint64() * (newMemSize - uint64(mem.Len())) / 32
@@ -711,6 +710,8 @@ func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
 				err          error
 				value        = stack.Pop()
 				size, offset = stack.Popn()
+				input        = mem.Get(offset.Int64(), size.Int64())
+				gas          = new(big.Int).Set(closure.Gas)
 
 				// Snapshot the current stack so we are able to
 				// revert back to it later.
@@ -726,6 +727,23 @@ func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
 
 			self.Printf(" (*) %x", addr).Endl()
 
+			closure.UseGas(closure.Gas)
+
+			msg := NewMessage(self, addr, input, gas, closure.Price, value)
+			ret, err := msg.Exec(closure)
+			if err != nil {
+				stack.Push(ethutil.BigFalse)
+
+				// Revert the state as it was before.
+				self.env.State().Set(snapshot)
+
+				self.Printf("CREATE err %v", err)
+			} else {
+				msg.object.Code = ret
+
+				stack.Push(ethutil.BigD(addr))
+			}
+			/*
 					msg := self.env.State().Manifest().AddMessage(&ethstate.Message{
 						To: addr, From: closure.Address(),
 						Origin: self.env.Origin(),
@@ -769,6 +787,7 @@ func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
 
 					msg.Output = contract.Code
 				}
+			*/
 			self.Endl()
 
 			// Debug hook
@@ -791,6 +810,26 @@ func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
 			// Get the arguments from the memory
 			args := mem.Get(inOffset.Int64(), inSize.Int64())
 
+			snapshot := self.env.State().Copy()
+
+			msg := NewMessage(self, addr.Bytes(), args, gas, closure.Price, value)
+			ret, err := msg.Exec(closure)
+			if err != nil {
+				stack.Push(ethutil.BigFalse)
+
+				self.env.State().Set(snapshot)
+			} else {
+				stack.Push(ethutil.BigTrue)
+
+				mem.Set(retOffset.Int64(), retSize.Int64(), ret)
+			}
+
+			// Debug hook
+			if self.Dbg != nil {
+				self.Dbg.SetCode(closure.Code)
+			}
+
+			/*
 				msg := self.env.State().Manifest().AddMessage(&ethstate.Message{
 					To: addr.Bytes(), From: closure.Address(),
 					Input:  args,
@@ -836,6 +875,23 @@ func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
 						self.Dbg.SetCode(closure.Code)
 					}
 				}
+			*/
+		case POST:
+			require(6)
+
+			self.Endl()
+
+			gas := stack.Pop()
+			// Pop gas and value of the stack.
+			value, addr := stack.Popn()
+			// Pop input size and offset
+			inSize, inOffset := stack.Popn()
+			// Get the arguments from the memory
+			args := mem.Get(inOffset.Int64(), inSize.Int64())
+
+			msg := NewMessage(self, addr.Bytes(), args, gas, closure.Price, value)
+
+			msg.Postpone()
 		case RETURN:
 			require(2)
 			size, offset := stack.Popn()
@@ -887,6 +943,10 @@ func (self *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
 	}
 }
 
+func (self *Vm) Queue() *list.List {
+	return self.queue
+}
+
 func (self *Vm) Printf(format string, v ...interface{}) *Vm {
 	if self.Verbose && self.logTy == LogTyPretty {
 		self.logStr += fmt.Sprintf(format, v...)
@@ -918,3 +978,64 @@ func ensure256(x *big.Int) {
 		x.SetInt64(0)
 	}
 }
+
+type Message struct {
+	vm                *Vm
+	closure           *Closure
+	address, input    []byte
+	gas, price, value *big.Int
+	object            *ethstate.StateObject
+}
+
+func NewMessage(vm *Vm, address, input []byte, gas, gasPrice, value *big.Int) *Message {
+	return &Message{vm: vm, address: address, input: input, gas: gas, price: gasPrice, value: value}
+}
+
+func (self *Message) Postpone() {
+	self.vm.queue.PushBack(self)
+}
+
+func (self *Message) Exec(caller ClosureRef) (ret []byte, err error) {
+	queue := self.vm.queue
+	self.vm.queue = list.New()
+
+	defer func() {
+		if err == nil {
+			queue.PushBackList(self.vm.queue)
+		}
+
+		self.vm.queue = queue
+	}()
+
+	msg := self.vm.env.State().Manifest().AddMessage(&ethstate.Message{
+		To: self.address, From: caller.Address(),
+		Input:  self.input,
+		Origin: self.vm.env.Origin(),
+		Block:  self.vm.env.BlockHash(), Timestamp: self.vm.env.Time(), Coinbase: self.vm.env.Coinbase(), Number: self.vm.env.BlockNumber(),
+		Value: self.value,
+	})
+
+	object := caller.Object()
+	if object.Balance.Cmp(self.value) < 0 {
+		caller.ReturnGas(self.gas, self.price)
+
+		err = fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.value, object.Balance)
+	} else {
+		stateObject := self.vm.env.State().GetOrNewStateObject(self.address)
+		self.object = stateObject
+
+		caller.Object().SubAmount(self.value)
+		stateObject.AddAmount(self.value)
+
+		// Create a new callable closure
+		c := NewClosure(msg, caller, object, object.Code, self.gas, self.price)
+		// Executer the closure and get the return value (if any)
+		ret, _, err = c.Call(self.vm, self.input)
+
+		msg.Output = ret
+
+		return ret, err
+	}
+
+	return
+}

natpmp.go

@@ -1,7 +1,6 @@
 package eth
 
 import (
-	//natpmp "code.google.com/p/go-nat-pmp"
 	"fmt"
 	"net"