From 800322969612ee461c3328a768881bdeb7bed90f Mon Sep 17 00:00:00 2001
From: Leither <leigrandmother@gmail.com>
Date: Tue, 1 Dec 2015 08:50:42 +0800
Subject: [PATCH 1/3] LPut

LPut add
---
 ledis/t_list.go | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/ledis/t_list.go b/ledis/t_list.go
index 079498e..33c0c04 100644
--- a/ledis/t_list.go
+++ b/ledis/t_list.go
@@ -321,6 +321,37 @@ func (db *DB) LPop(key []byte) ([]byte, error) {
 func (db *DB) LPush(key []byte, args ...[]byte) (int64, error) {
 	return db.lpush(key, listHeadSeq, args...)
 }
+func (db *DB) LSet(key []byte, index int32, value []byte) error {
+	if err := checkKeySize(key); err != nil {
+		return err
+	}
+
+	var seq int32
+	var headSeq int32
+	var tailSeq int32
+	//var size int32
+	var err error
+	t := db.listBatch
+	t.Lock()
+	defer t.Unlock()
+	metaKey := db.lEncodeMetaKey(key)
+
+	headSeq, tailSeq, _, err = db.lGetMeta(nil, metaKey)
+	if err != nil {
+		return err
+	}
+
+	if index >= 0 {
+		seq = headSeq + index
+	} else {
+		seq = tailSeq + index + 1
+	}
+
+	sk := db.lEncodeListKey(key, seq)
+	t.Put(sk, value)
+	err = t.Commit()
+	return err
+}
 
 func (db *DB) LRange(key []byte, start int32, stop int32) ([][]byte, error) {
 	if err := checkKeySize(key); err != nil {

From df27eeedeca42c377fbadbe77361054f241259ea Mon Sep 17 00:00:00 2001
From: Leither <leigrandmother@gmail.com>
Date: Thu, 10 Dec 2015 12:08:14 +0800
Subject: [PATCH 2/3] Update t_list.go

---
 ledis/t_list.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ledis/t_list.go b/ledis/t_list.go
index 33c0c04..96eefb3 100644
--- a/ledis/t_list.go
+++ b/ledis/t_list.go
@@ -346,7 +346,9 @@ func (db *DB) LSet(key []byte, index int32, value []byte) error {
 	} else {
 		seq = tailSeq + index + 1
 	}
-
+	if seq < headSeq || seq > tailSeq {
+		return errListIndex
+	}
 	sk := db.lEncodeListKey(key, seq)
 	t.Put(sk, value)
 	err = t.Commit()

From 7c8bcb26d8e84e93e05598efb1e91aa4daf3145e Mon Sep 17 00:00:00 2001
From: Leither <leigrandmother@gmail.com>
Date: Thu, 10 Dec 2015 12:09:10 +0800
Subject: [PATCH 3/3] Update const.go

---
 ledis/const.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ledis/const.go b/ledis/const.go
index 9b2daaf..7a0450f 100644
--- a/ledis/const.go
+++ b/ledis/const.go
@@ -50,6 +50,7 @@ var (
 	errHashFieldSize  = errors.New("invalid hash field size")
 	errZSetMemberSize = errors.New("invalid zset member size")
 	errExpireValue    = errors.New("invalid expire value")
+	errListIndex      = errors.New("invalid list index")
 )
 
 const (