ioctx: Stat added

Signed-off-by: Vincent Giersch <vincent.giersch@ovh.net>

rados/ioctx.go

@@ -6,6 +6,7 @@ package rados
 import "C"
 
 import "unsafe"
+import "time"
 
 // PoolStat represents Ceph pool statistics.
 type PoolStat struct {
@@ -31,6 +32,14 @@ type PoolStat struct {
 	Num_wr_kb            uint64
 }
 
+// ObjectStat represents an object stat information
+type ObjectStat struct {
+	// current length in bytes
+	Size        uint64
+	// last modification time
+	ModTime     time.Time
+}
+
 // IOContext represents a context for performing I/O within a pool.
 type IOContext struct {
 	ioctx C.rados_ioctx_t
@@ -192,6 +201,29 @@ func (ioctx *IOContext) ListObjects(listFn ObjectListFunc) error {
 	panic("invalid state")
 }
 
+// Stat returns the size of the object and its last modification time
+func (ioctx *IOContext) Stat(object string) (stat ObjectStat, err error) {
+	var c_psize C.uint64_t
+	var c_pmtime C.time_t
+	c_object := C.CString(object)
+	defer C.free(unsafe.Pointer(c_object))
+
+	ret := C.rados_stat(
+		ioctx.ioctx,
+		c_object,
+		&c_psize,
+		&c_pmtime)
+
+	if ret < 0 {
+		return ObjectStat{}, RadosError(int(ret))
+	} else {
+		return ObjectStat{
+			Size: uint64(c_psize),
+			ModTime: time.Unix(int64(c_pmtime), 0),
+		}, nil
+	}
+}
+
 // GetXattr gets an xattr with key `name`, it returns the length of
 // the key read or an error if not successful
 func (ioctx *IOContext) GetXattr(object string, name string, data []byte) (int, error) {

rados/rados_test.go

@@ -310,6 +310,30 @@ func TestReadWrite(t *testing.T) {
 	pool.Destroy()
 }
 
+func TestObjectStat(t *testing.T) {
+	conn, _ := rados.NewConn()
+	conn.ReadDefaultConfigFile()
+	conn.Connect()
+
+	pool_name := GetUUID()
+	err := conn.MakePool(pool_name)
+	assert.NoError(t, err)
+
+	pool, err := conn.OpenIOContext(pool_name)
+	assert.NoError(t, err)
+
+	bytes_in := []byte("input data")
+	err = pool.Write("obj", bytes_in, 0)
+	assert.NoError(t, err)
+
+	stat, err := pool.Stat("obj")
+	assert.Equal(t, uint64(len(bytes_in)), stat.Size)
+	assert.NotNil(t, stat.ModTime)
+
+	pool.Destroy()
+	conn.Shutdown()
+}
+
 func TestGetPoolStats(t *testing.T) {
 	conn, _ := rados.NewConn()
 	conn.ReadDefaultConfigFile()