state: implement SignedDataSource on ChangeStateRequest message

state/types.go

@@ -0,0 +1,24 @@
+package state
+
+import (
+	"encoding/binary"
+)
+
+// SetState is a State field setter.
+func (m *ChangeStateRequest) SetState(st ChangeStateRequest_State) {
+	m.State = st
+}
+
+// Size returns the size of the state binary representation.
+func (ChangeStateRequest_State) Size() int {
+	return 4
+}
+
+// Bytes returns the state binary representation.
+func (x ChangeStateRequest_State) Bytes() []byte {
+	data := make([]byte, x.Size())
+
+	binary.BigEndian.PutUint32(data, uint32(x))
+
+	return data
+}