Use attrs on exception classes

fbchat/_exception.py

@@ -1,32 +1,32 @@
+import attr
+
+# Not frozen, since that doesn't work in PyPy
+attrs_exception = attr.s(slots=True, auto_exc=True)
+
+
+@attrs_exception
 class FBchatException(Exception):
     """Custom exception thrown by ``fbchat``.
 
     All exceptions in the ``fbchat`` module inherits this.
     """
 
+    message = attr.ib()
 
+
+@attrs_exception
 class FBchatFacebookError(FBchatException):
+    """Raised when Facebook returns an error."""
+
     #: The error code that Facebook returned
-    fb_error_code = None
+    fb_error_code = attr.ib(None)
     #: The error message that Facebook returned (In the user's own language)
-    fb_error_message = None
+    fb_error_message = attr.ib(None)
     #: The status code that was sent in the HTTP response (e.g. 404) (Usually only set if not successful, aka. not 200)
-    request_status_code = None
-
-    def __init__(
-        self,
-        message,
-        fb_error_code=None,
-        fb_error_message=None,
-        request_status_code=None,
-    ):
-        super(FBchatFacebookError, self).__init__(message)
-        """Thrown by ``fbchat`` when Facebook returns an error"""
-        self.fb_error_code = str(fb_error_code)
-        self.fb_error_message = fb_error_message
-        self.request_status_code = request_status_code
+    request_status_code = attr.ib(None)
 
 
+@attrs_exception
 class FBchatInvalidParameters(FBchatFacebookError):
     """Raised by Facebook if:
 
@@ -36,17 +36,19 @@ class FBchatInvalidParameters(FBchatFacebookError):
     """
 
 
+@attrs_exception
 class FBchatNotLoggedIn(FBchatFacebookError):
     """Raised by Facebook if the client has been logged out."""
 
-    fb_error_code = "1357001"
+    fb_error_code = attr.ib("1357001")
 
 
+@attrs_exception
 class FBchatPleaseRefresh(FBchatFacebookError):
     """Raised by Facebook if the client has been inactive for too long.
 
     This error usually happens after 1-2 days of inactivity.
     """
 
-    fb_error_code = "1357004"
-    fb_error_message = "Please try closing and re-opening your browser window."
+    fb_error_code = attr.ib("1357004")
+    fb_error_message = attr.ib("Please try closing and re-opening your browser window.")

pyproject.toml

@@ -14,7 +14,7 @@ maintainer-email = "madsmtm@gmail.com"
 home-page = "https://github.com/carpedm20/fbchat/"
 requires = [
     "aenum~=2.0",
-    "attrs>=18.2",
+    "attrs>=19.1",
     "requests~=2.19",
     "beautifulsoup4~=4.0",
 ]