Removed from as a requirement and changed

Removed the from as a requiremet from the RPC eth_call. Xeth#Call now
also default values to:

1. Supplied account
2. First account if any
3. No managed account => 000000..00

rpc/args.go

@@ -279,11 +279,6 @@ func (args *CallArgs) UnmarshalJSON(b []byte) (err error) {
 		return NewDecodeParamError(err.Error())
 	}
 
-	if len(ext.From) == 0 {
-		return NewValidationError("from", "is required")
-	}
-	args.From = ext.From
-
 	if len(ext.To) == 0 {
 		return NewValidationError("to", "is required")
 	}

rpc/args_test.go

@@ -671,10 +671,6 @@ func TestCallArgs(t *testing.T) {
 		t.Error(err)
 	}
 
-	if expected.From != args.From {
-		t.Errorf("From shoud be %#v but is %#v", expected.From, args.From)
-	}
-
 	if expected.To != args.To {
 		t.Errorf("To shoud be %#v but is %#v", expected.To, args.To)
 	}
@@ -895,19 +891,8 @@ func TestCallArgsNotStrings(t *testing.T) {
 	}
 }
 
-func TestCallArgsFromEmpty(t *testing.T) {
-	input := `[{"to": "0xb60e8dd61c5d32be8058bb8eb970870f07233155"}]`
-
-	args := new(CallArgs)
-	str := ExpectValidationError(json.Unmarshal([]byte(input), &args))
-	if len(str) > 0 {
-		t.Error(str)
-	}
-}
-
 func TestCallArgsToEmpty(t *testing.T) {
 	input := `[{"from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155"}]`
-
 	args := new(CallArgs)
 	str := ExpectValidationError(json.Unmarshal([]byte(input), &args))
 	if len(str) > 0 {

xeth/xeth.go

@@ -572,8 +572,20 @@ func (self *XEth) PushTx(encodedTx string) (string, error) {
 
 func (self *XEth) Call(fromStr, toStr, valueStr, gasStr, gasPriceStr, dataStr string) (string, error) {
 	statedb := self.State().State() //self.eth.ChainManager().TransState()
+	var from *state.StateObject
+	if len(fromStr) == 0 {
+		accounts, err := self.backend.AccountManager().Accounts()
+		if err != nil || len(accounts) == 0 {
+			from = statedb.GetOrNewStateObject(common.Address{})
+		} else {
+			from = statedb.GetOrNewStateObject(common.BytesToAddress(accounts[0].Address))
+		}
+	} else {
+		from = statedb.GetOrNewStateObject(common.HexToAddress(fromStr))
+	}
+
 	msg := callmsg{
-		from:     statedb.GetOrNewStateObject(common.HexToAddress(fromStr)),
+		from:     from,
 		to:       common.HexToAddress(toStr),
 		gas:      common.Big(gasStr),
 		gasPrice: common.Big(gasPriceStr),