1 files changed, 71 insertions, 0 deletions
diff --git a/core/execution.go b/core/execution.go
new file mode 100644
index 000000000..b7eead0dd
--- /dev/null
+++ b/core/execution.go
@@ -0,0 +1,71 @@
+package core
+
+import (
+	"fmt"
+	"math/big"
+	"time"
+
+	"github.com/ethereum/go-ethereum/state"
+	"github.com/ethereum/go-ethereum/vm"
+)
+
+type Execution struct {
+	env               vm.Environment
+	address, input    []byte
+	Gas, price, value *big.Int
+	SkipTransfer      bool
+}
+
+func NewExecution(env vm.Environment, address, input []byte, gas, gasPrice, value *big.Int) *Execution {
+	return &Execution{env: env, address: address, input: input, Gas: gas, price: gasPrice, value: value}
+}
+
+func (self *Execution) Addr() []byte {
+	return self.address
+}
+
+func (self *Execution) Call(codeAddr []byte, caller vm.ClosureRef) ([]byte, error) {
+	// Retrieve the executing code
+	code := self.env.State().GetCode(codeAddr)
+
+	return self.exec(code, codeAddr, caller)
+}
+
+func (self *Execution) exec(code, contextAddr []byte, caller vm.ClosureRef) (ret []byte, err error) {
+	env := self.env
+	evm := vm.New(env, vm.DebugVmTy)
+
+	if env.Depth() == vm.MaxCallDepth {
+		// Consume all gas (by not returning it) and return a depth error
+		return nil, vm.DepthError{}
+	}
+
+	from, to := env.State().GetStateObject(caller.Address()), env.State().GetOrNewStateObject(self.address)
+	// Skipping transfer is used on testing for the initial call
+	if !self.SkipTransfer {
+		err = env.Transfer(from, to, self.value)
+		if err != nil {
+			caller.ReturnGas(self.Gas, self.price)
+
+			err = fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.value, from.Balance)
+			return
+		}
+	}
+
+	snapshot := env.State().Copy()
+	start := time.Now()
+	ret, err = evm.Run(to, caller, code, self.value, self.Gas, self.price, self.input)
+	if err != nil {
+		env.State().Set(snapshot)
+	}
+	chainlogger.Debugf("vm took %v\n", time.Since(start))
+
+	return
+}
+
+func (self *Execution) Create(caller vm.ClosureRef) (ret []byte, err error, account *state.StateObject) {
+	ret, err = self.exec(self.input, nil, caller)
+	account = self.env.State().GetStateObject(self.address)
+
+	return
+}