Add attrs support #92
Description
It would be very nice to have attrs support, alongside support for dataclasses.
Attrs works quite similarly to dataclasses (dataclasses drew a lot of inspiration from attrs).
The major difference for serialization with orjson is, that the list of fields can be found in the __attrs_attrs__ attribute. As POC, I wrote a small patch:
--- a/src/typeref.rs
+++ b/src/typeref.rs
@@ -84,7 +84,7 @@
DST_STR = PyUnicode_InternFromString("dst\0".as_ptr() as *const c_char);
DICT_STR = PyUnicode_InternFromString("__dict__\0".as_ptr() as *const c_char);
DATACLASS_FIELDS_STR =
- PyUnicode_InternFromString("__dataclass_fields__\0".as_ptr() as *const c_char);
+ PyUnicode_InternFromString("__attrs_attrs__\0".as_ptr() as *const c_char);
ARRAY_STRUCT_STR =
pyo3::ffi::PyUnicode_InternFromString("__array_struct__\0".as_ptr() as *const c_char);
VALUE_STR = pyo3::ffi::PyUnicode_InternFromString("value\0".as_ptr() as *const c_char);I compiled orjson and tested it:
>>> from attr import dataclass
>>> import orjson
>>>
>>> @dataclass
... class Data:
... x: int
... y: int
...
>>> orjson.dumps(Data(1, 2))
b'{"x":1,"y":2}'