Add GetPoolByID() for calling rados_pool_reverse_lookup()

Signed-off-by: Niels de Vos <ndevos@redhat.com>

rados/conn.go

@@ -296,6 +296,22 @@ func (c *Conn) GetPoolByName(name string) (int64, error) {
 	}
 }
 
+// GetPoolByID returns the name of a pool by a given ID.
+func (c *Conn) GetPoolByID(id int64) (string, error) {
+	buf := make([]byte, 4096)
+	if err := c.ensure_connected(); err != nil {
+		fmt.Println("NOT CONNECTED WHOOPS")
+		return "", err
+	}
+	c_id := C.int64_t(id)
+	ret := int(C.rados_pool_reverse_lookup(c.cluster, c_id, (*C.char)(unsafe.Pointer(&buf[0])), C.size_t(len(buf))))
+	if ret < 0 {
+		return "", RadosError(ret)
+	} else {
+		return C.GoString((*C.char)(unsafe.Pointer(&buf[0]))), nil
+	}
+}
+
 // MonCommand sends a command to one of the monitors
 func (c *Conn) MonCommand(args []byte) (buffer []byte, info string, err error) {
 	return c.monCommand(args, nil)

rados/rados_test.go

@@ -351,6 +351,48 @@ func (suite *RadosTestSuite) TestGetPoolByName() {
 	}
 }
 
+func (suite *RadosTestSuite) TestGetPoolByID() {
+	suite.SetupConnection()
+
+	// check that new pool name is unique
+	new_name := uuid.Must(uuid.NewV4()).String()
+	pool, err := suite.conn.GetPoolByName(new_name)
+	if pool != 0 || err == nil {
+		suite.T().Error("Random pool name exists!")
+		return
+	}
+
+	// create pool
+	err = suite.conn.MakePool(new_name)
+	assert.NoError(suite.T(), err)
+
+	// verify that the new pool name exists
+	id, err := suite.conn.GetPoolByName(new_name)
+	assert.NoError(suite.T(), err)
+
+	if id == 0 {
+		suite.T().Error("Cannot find newly created pool")
+	}
+
+	// get the name of the pool
+	name, err := suite.conn.GetPoolByID(id)
+	assert.NoError(suite.T(), err)
+
+	if name == "" {
+		suite.T().Error("Cannot find name of newly created pool")
+	}
+
+	// delete the pool
+	err = suite.conn.DeletePool(new_name)
+	assert.NoError(suite.T(), err)
+
+	// verify that it is gone
+	name, err = suite.conn.GetPoolByID(id)
+	if name != "" || err == nil {
+		suite.T().Error("Deleted pool still exists")
+	}
+}
+
 func (suite *RadosTestSuite) TestPingMonitor() {
 	suite.SetupConnection()