support create directory

file_system/file_system.go

@@ -19,7 +19,7 @@ type FileSystem struct {
 
 func New() *FileSystem {
 	return &FileSystem{
-		Root:       newDir("/", 0, 0, nil, ""),
+		Root:       newDir("/", 0, 0, nil, "", Permanent),
 		WatcherHub: newWatchHub(1000),
 	}
 
@@ -36,6 +36,7 @@ func (fs *FileSystem) Get(keyPath string, recusive bool, index uint64, term uint
 	e := newEvent(Get, keyPath, index, term)
 
 	if n.IsDir() { // node is dir
+		e.Dir = true
 
 		children, _ := n.List()
 		e.KVPairs = make([]KeyValuePair, len(children))
@@ -57,7 +58,6 @@ func (fs *FileSystem) Get(keyPath string, recusive bool, index uint64, term uint
 
 		// eliminate hidden nodes
 		e.KVPairs = e.KVPairs[:i]
-
 	} else { // node is file
 		e.Value = n.Value
 	}
@@ -91,11 +91,22 @@ func (fs *FileSystem) Create(keyPath string, value string, expireTime time.Time,
 	}
 
 	e := newEvent(Set, keyPath, fs.Index, fs.Term)
-	e.Value = value
 
-	f := newFile(keyPath, value, fs.Index, fs.Term, d, "", expireTime)
+	var n *Node
 
-	err = d.Add(f)
+	if len(value) != 0 { // create file
+		e.Value = value
+
+		n = newFile(keyPath, value, fs.Index, fs.Term, d, "", expireTime)
+
+	} else { // create directory
+		e.Dir = true
+
+		n = newDir(keyPath, fs.Index, fs.Term, d, "", expireTime)
+
+	}
+
+	err = d.Add(n)
 
 	if err != nil {
 		return nil, err
@@ -103,8 +114,8 @@ func (fs *FileSystem) Create(keyPath string, value string, expireTime time.Time,
 
 	// Node with TTL
 	if expireTime != Permanent {
-		go f.Expire()
+		go n.Expire()
-		e.Expiration = &f.ExpireTime
+		e.Expiration = &n.ExpireTime
 		e.TTL = int64(expireTime.Sub(time.Now()) / time.Second)
 	}
 
@@ -268,7 +279,7 @@ func (fs *FileSystem) checkDir(parent *Node, dirName string) (*Node, error) {
 		return subDir, nil
 	}
 
-	n := newDir(path.Join(parent.Path, dirName), fs.Index, fs.Term, parent, parent.ACL)
+	n := newDir(path.Join(parent.Path, dirName), fs.Index, fs.Term, parent, parent.ACL, Permanent)
 
 	parent.Children[dirName] = n
 

file_system/file_system_test.go

@@ -21,12 +21,32 @@ func TestCreateAndGet(t *testing.T) {
 	}
 
 	// meet file, create should fail
-	_, err = fs.Create("/foo/bar/bar", "bar", Permanent, 1, 1)
+	_, err = fs.Create("/foo/bar/bar", "bar", Permanent, 2, 1)
 
 	if err == nil {
 		t.Fatal("Create should fail")
 	}
 
+	// create a directory
+	_, err = fs.Create("/fooDir", "", Permanent, 3, 1)
+
+	if err != nil {
+		t.Fatal("Cannot create /fooDir")
+	}
+
+	e, err := fs.Get("/fooDir", false, 3, 1)
+
+	if err != nil || e.Dir != true {
+		t.Fatal("Cannot create /fooDir ")
+	}
+
+	// create a file under directory
+	_, err = fs.Create("/fooDir/bar", "bar", Permanent, 4, 1)
+
+	if err != nil {
+		t.Fatal("Cannot create /fooDir/bar = bar")
+	}
+
 }
 
 func TestUpdateFile(t *testing.T) {

file_system/node.go

@@ -49,7 +49,7 @@ func newFile(keyPath string, value string, createIndex uint64, createTerm uint64
 	}
 }
 
-func newDir(keyPath string, createIndex uint64, createTerm uint64, parent *Node, ACL string) *Node {
+func newDir(keyPath string, createIndex uint64, createTerm uint64, parent *Node, ACL string, expireTime time.Time) *Node {
 	return &Node{
 		Path:        keyPath,
 		CreateIndex: createIndex,
@@ -57,6 +57,7 @@ func newDir(keyPath string, createIndex uint64, createTerm uint64, parent *Node,
 		Parent:      parent,
 		ACL:         ACL,
 		stopExpire:  make(chan bool, 1),
+		ExpireTime:  expireTime,
 		Children:    make(map[string]*Node),
 	}
 }
@@ -210,7 +211,7 @@ func (n *Node) Clone() *Node {
 		return newFile(n.Path, n.Value, n.CreateIndex, n.CreateTerm, n.Parent, n.ACL, n.ExpireTime)
 	}
 
-	clone := newDir(n.Path, n.CreateIndex, n.CreateTerm, n.Parent, n.ACL)
+	clone := newDir(n.Path, n.CreateIndex, n.CreateTerm, n.Parent, n.ACL, n.ExpireTime)
 
 	for key, child := range n.Children {
 		clone.Children[key] = child.Clone()