From 0d200baf72960815c4b7e51dba1fb1adfd011350 Mon Sep 17 00:00:00 2001
From: Yicheng Qin <qycqycqycqycqyc@gmail.com>
Date: Mon, 24 Nov 2014 23:27:57 -0800
Subject: [PATCH] raft: refine raftLog.term

---
 raft/log.go | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/raft/log.go b/raft/log.go
index 2e66d48dc..bacbbe05b 100644
--- a/raft/log.go
+++ b/raft/log.go
@@ -195,23 +195,22 @@ func (l *raftLog) lastTerm() uint64 {
 }
 
 func (l *raftLog) term(i uint64) uint64 {
-	if i >= l.unstable+uint64(len(l.unstableEnts)) {
+	switch {
+	case i > l.lastIndex():
 		return 0
-	}
-
-	if i < l.unstable {
+	case i < l.unstable:
 		t, err := l.storage.Term(i)
-		if err == nil {
+		switch err {
+		case nil:
 			return t
-		}
-		if err == ErrCompacted {
+		case ErrCompacted:
 			return 0
-		} else {
+		default:
 			panic(err) // TODO(bdarnell)
 		}
+	default:
+		return l.unstableEnts[i-l.unstable].Term
 	}
-
-	return l.unstableEnts[i-l.unstable].Term
 }
 
 func (l *raftLog) entries(i uint64) []pb.Entry {