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from dataclasses import dataclass
from random import Random
_U32_MAX = 4294967296
@dataclass(frozen=True)
class Seed:
value: int
"""
The value of the seed. This value may be signed and generally have any range.
"""
@staticmethod
def from_bytes(b: bytes):
return Seed(Random(b).randint(0, _U32_MAX - 1))
def to_range(self, a: int, b: int) -> int:
"""
Returns the value of the seed within the given range [a,b] both ends inclusive.
If the current seed is not within the given range, a value within the range will be derived from the current seed.
"""
if a <= self.value <= b:
return self.value
return Random(self.value).randint(a, b)
def to_u32(self) -> int:
"""
Returns the value of the seed as a 32bit unsigned integer.
"""
return self.to_range(0, _U32_MAX - 1)
def cache_key_func(self):
return self.value
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