feat: improve unmarshalling performance (#18)

src/dbus_fast/_private/unmarshaller.py

@@ -94,6 +94,24 @@ class Unmarshaller:
     unpack: Dict[str, Struct]
     readers: READER_TYPE
 
+    __slots__ = (
+        "unix_fds",
+        "can_cast",
+        "buf",
+        "view",
+        "offset",
+        "stream",
+        "sock",
+        "message",
+        "readers",
+        "body_len",
+        "serial",
+        "header_len",
+        "message_type",
+        "flag",
+        "msg_len",
+    )
+
     def __init__(self, stream: io.BufferedRWPair, sock=None):
         self.unix_fds: List[int] = []
         self.can_cast = False
@@ -109,6 +127,7 @@ class Unmarshaller:
         self.header_len: int | None = None
         self.message_type: MessageType | None = None
         self.flag: MessageFlag | None = None
+        self.msg_len = 0
 
     def read_sock(self, length: int) -> bytes:
         """reads from the socket, storing any fds sent and handling errors
@@ -220,8 +239,7 @@ class Unmarshaller:
 
     def read_argument(self, type_: SignatureType) -> Any:
         """Dispatch to an argument reader or cast/unpack a C type."""
-        token = type_.token
+        reader, ctype, size, struct = self.readers[type_.token]
-        reader, ctype, size, struct = self.readers[token]
         if reader:  # complex type
             return reader(self, type_)
         self.offset += size + (-self.offset & (size - 1))  # align

src/dbus_fast/message.py

@@ -76,6 +76,23 @@ class Message:
         - :class:`InvalidInterfaceNameError` - If ``error_name`` or ``interface`` is not a valid interface name.
     """
 
+    __slots__ = (
+        "destination",
+        "path",
+        "interface",
+        "member",
+        "message_type",
+        "flags",
+        "error_name",
+        "reply_serial",
+        "sender",
+        "unix_fds",
+        "signature",
+        "signature_tree",
+        "body",
+        "serial",
+    )
+
     def __init__(
         self,
         destination: str = None,

src/dbus_fast/signature.py

@@ -398,6 +398,8 @@ class Variant:
         :class:`SignatureBodyMismatchError` if the signature does not match the body.
     """
 
+    __slots__ = ("type", "signature", "value")
+
     def __init__(
         self,
         signature: Union[str, SignatureTree, SignatureType],

src/dbus_fast/validators.py

@@ -49,7 +49,7 @@ def is_bus_name_valid(name: str) -> bool:
     return True
 
 
-@lru_cache(maxsize=512)
+@lru_cache(maxsize=1024)
 def is_object_path_valid(path: str) -> bool:
     """Whether this is a valid object path.