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from dataclasses import dataclass, field
from datetime import datetime
from typing import Optional
import typedload.datadumper # noqa
import typedload.dataloader # noqa
from common import Benchmark, Methods, Payment
@dataclass(frozen=True)
class Message:
title: str
body: str
addresses: Optional[list[str]] = None # no Python 3.10 support in 2.14
persistence: Optional[int] = None
@dataclass(frozen=True)
class Client:
id: int
first_name: str = field(metadata={"name": "firstName"})
last_name: str = field(metadata={"name": "lastName"})
def __post_init__(self): # The only way I've found to add constraints
if self.id < 0:
raise ValueError
@dataclass(frozen=True)
class Item:
name: str
price: float
quantity: int = 1
def __post_init__(self):
if self.price < 0 or self.quantity < 1:
raise ValueError
@dataclass(frozen=True)
class Receipt:
store: str
address: str
date: datetime
items: list[Item]
payment: Payment
client: Optional[Client] = None
special_offers: Optional[float] = field(
default=None, metadata={"name": "specialOffers"}
)
def __post_init__(self):
if self.special_offers is not None and self.special_offers < 0:
raise ValueError
loader = typedload.dataloader.Loader()
loader.handlers.insert(
loader.index(datetime),
(lambda tp: tp is datetime, lambda _, value, tp: datetime.fromisoformat(value)),
)
dumper = typedload.datadumper.Dumper()
dumper.handlers.insert(
dumper.index(datetime.now()),
(lambda tp: tp is datetime, lambda _, value, tp: value.isoformat()),
)
def methods(cls: type) -> Methods:
load = loader.load
return Methods(lambda data: load(data, cls), dumper.dump)
benchmarks = Benchmark(methods(Message), methods(Receipt))
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