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Fix/discrete log async #131

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Merged
keithrfung merged 2 commits into from
Aug 5, 2020
Merged

Fix/discrete log async #131

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a565e1e
fixed async issue when no event loop
danwallach Aug 3, 2020
18b067f
clean up comments
AddressXception Aug 5, 2020
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9 changes: 7 additions & 2 deletions src/electionguard/dlog.py
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Original file line number Diff line number Diff line change
@@ -1,14 +1,15 @@
# support for computing discrete logs, with a cache so they're never recomputed

import asyncio
from typing import Dict
from typing import Dict, Optional

from .group import G, ElementModP, ONE_MOD_P, mult_p, int_to_p_unchecked

__dlog_cache: Dict[ElementModP, int] = {ONE_MOD_P: 0}
__dlog_max_elem = ONE_MOD_P
__dlog_max_exp = 0
__dlog_lock = asyncio.Lock()

__dlog_lock: Optional[asyncio.Lock] = None


def discrete_log(e: ElementModP) -> int:
Expand Down Expand Up @@ -38,6 +39,10 @@ async def __discrete_log_internal(e: ElementModP) -> int:
global __dlog_max_exp
global __dlog_lock

if __dlog_lock is None:
# Initialize the lock on on first function call per process
__dlog_lock = asyncio.Lock()
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async with __dlog_lock:
g = int_to_p_unchecked(G)
while e != __dlog_max_elem:
Expand Down