Pass cache result into ttl function

[Rebzzel]

With new exceptions api (#143), this feature may be super useful.

def my_ttl_calculation(a: int, prev_cache_result: Any | None):
    if isinstance(prev_cache_result, MyException):
        return "5m"
    return "10s"
    

@cache(ttl=my_ttl_calculation)    
def my_func(a: int):
    ...

[Krukov]

Thanks , I'll think about this feature

Am I right that prev_cache_result is a last result in cache ? in this case it is only possible with early ( https://github.com/Krukov/cashews#early ) or hit strategy (a cached value should be still in a storage)

[Rebzzel]

Yes, that's right. But I have another better idea - we can calculate ttl after receiving result. Then this becomes really powerful.

[Rebzzel]

So this becomes:

def my_ttl_calculation(a: int, result: Any):
    if isinstance(result, MyException):
        return "5m"
    return "10s"
    

@cache(ttl=my_ttl_calculation)    
def my_func(a: int):
    ...

[Krukov]

yep I like it more then passing prev result. I'll definitely implement it

[Krukov]

released 6.3.0