raft: attempt first version of Interface

raft/node.go

@@ -0,0 +1,31 @@
+package raft
+
+import "sync"
+
+type Interface interface {
+	Step(m Message)
+}
+
+type Node struct {
+	lk sync.Mutex
+	sm *stateMachine
+}
+
+func New(k, addr int, next Interface) Interface {
+	n := &Node{
+		sm: newStateMachine(k, addr, next),
+	}
+	return n
+}
+
+// Propose asynchronously proposes data be applied to the underlying state machine.
+func (n *Node) Propose(data []byte) {
+	m := Message{Type: msgHup, Data: data}
+	n.Step(m)
+}
+
+func (n *Node) Step(m Message) {
+	n.lk.Lock()
+	defer n.lk.Unlock()
+	n.sm.Step(m)
+}