pybind/rados: add more type hintings

Signed-off-by: Kefu Chai <kchai@redhat.com>

src/pybind/rados/rados.pyx

@@ -774,7 +774,7 @@ Rados object in state %s." % self.state)
         self.shutdown()
         return False
 
-    def version(self):
+    def version(self) -> Version:
         """
         Get the version number of the ``librados`` C library.
 
@@ -803,7 +803,7 @@ Rados object in state %s." % self.state)
         if ret != 0:
             raise make_ex(ret, "error calling conf_read_file")
 
-    def conf_parse_argv(self, args):
+    def conf_parse_argv(self, args: Sequence[str]):
         """
         Parse known arguments from args, and remove; returned
         args contain only those unknown to ceph
@@ -938,7 +938,7 @@ Rados object in state %s." % self.state)
             rados_buffer_free(outstr)
             return decode_cstr(my_outstr)
 
-    def connect(self, timeout=0):
+    def connect(self, timeout: int = 0):
         """
         Connect to the cluster.  Use shutdown() to release resources.
         """
@@ -3045,7 +3045,7 @@ returned %d, but should return zero on success." % (self.name, ret))
             raise LogicError("Ioctx.append(%s): rados_append \
 returned %d, but should return zero on success." % (self.name, ret))
 
-    def read(self, key: str, length: int = 8192, offset: int = 0):
+    def read(self, key: str, length: int = 8192, offset: int = 0) -> bytes:
         """
         Read data from an object synchronously
 
@@ -3259,7 +3259,7 @@ returned %d, but should return zero on success." % (self.name, ret))
         assert ret < -MAX_ERRNO or ret == 0, "Ioctx.cmpext(%s): failed to compare %s" % (self.name, key)        
         return ret
 
-    def stat(self, key: str):
+    def stat(self, key: str) -> Tuple[int, time.struct_time]:
         """
         Get object stats (size/mtime)
 
@@ -3283,7 +3283,7 @@ returned %d, but should return zero on success." % (self.name, ret))
             raise make_ex(ret, "Failed to stat %r" % key)
         return psize, time.localtime(pmtime)
 
-    def get_xattr(self, key: str, xattr_name: str):
+    def get_xattr(self, key: str, xattr_name: str) -> bytes:
         """
         Get the value of an extended attribute on an object.
 
@@ -3319,7 +3319,7 @@ returned %d, but should return zero on success." % (self.name, ret))
         finally:
             free(ret_buf)
 
-    def get_xattrs(self, oid: str):
+    def get_xattrs(self, oid: str) -> XattrIterator:
         """
         Start iterating over xattrs on an object.
 
@@ -3332,7 +3332,7 @@ returned %d, but should return zero on success." % (self.name, ret))
         self.require_ioctx_open()
         return XattrIterator(self, oid)
 
-    def set_xattr(self, key: str, xattr_name: str, xattr_value: bytes):
+    def set_xattr(self, key: str, xattr_name: str, xattr_value: bytes) -> bool:
         """
         Set an extended attribute on an object.
 
@@ -3361,7 +3361,7 @@ returned %d, but should return zero on success." % (self.name, ret))
             raise make_ex(ret, "Failed to set xattr %r" % xattr_name)
         return True
 
-    def rm_xattr(self, key: str, xattr_name: str):
+    def rm_xattr(self, key: str, xattr_name: str) -> bool:
         """
         Removes an extended attribute on from an object.
 
@@ -3437,7 +3437,7 @@ returned %d, but should return zero on success." % (self.name, ret))
 
         return Watch(self, obj, callback, error_callback, timeout)
 
-    def list_objects(self):
+    def list_objects(self) -> ObjectIterator:
         """
         Get ObjectIterator on rados.Ioctx object.
 
@@ -4359,35 +4359,35 @@ class Object(object):
 
     @set_object_locator
     @set_object_namespace
-    def stat(self):
+    def stat(self) -> Tuple[int, time.struct_time]:
         self.require_object_exists()
         return self.ioctx.stat(self.key)
 
-    def seek(self, position):
+    def seek(self, position: int):
         self.require_object_exists()
         self.offset = position
 
     @set_object_locator
     @set_object_namespace
-    def get_xattr(self, xattr_name):
+    def get_xattr(self, xattr_name: str) -> bytes:
         self.require_object_exists()
         return self.ioctx.get_xattr(self.key, xattr_name)
 
     @set_object_locator
     @set_object_namespace
-    def get_xattrs(self):
+    def get_xattrs(self) -> XattrIterator:
         self.require_object_exists()
         return self.ioctx.get_xattrs(self.key)
 
     @set_object_locator
     @set_object_namespace
-    def set_xattr(self, xattr_name, xattr_value):
+    def set_xattr(self, xattr_name: str, xattr_value: bytes) -> bool:
         self.require_object_exists()
         return self.ioctx.set_xattr(self.key, xattr_name, xattr_value)
 
     @set_object_locator
     @set_object_namespace
-    def rm_xattr(self, xattr_name):
+    def rm_xattr(self, xattr_name: str) -> bool:
         self.require_object_exists()
         return self.ioctx.rm_xattr(self.key, xattr_name)