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util.py: get_keccak(): cache result

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The MMGen Project 2022-04-29 16:53:51 +00:00
commit 815e75c602
Signed by: mmgen
GPG key ID: 3F8B1861E32B7DA2
1 changed files with 15 additions and 14 deletions
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27
mmgen/util.py
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@ -209,21 +209,22 @@ def exit_if_mswin(feature):
if g.platform == 'win':
die(2, capfirst(feature) + ' not supported on the MSWin / MSYS2 platform' )
def get_keccak():
def get_keccak(cached_ret=[]):
from .opts import opt
# called in opts.init() via CoinProtocol, so must use getattr():
if getattr(opt,'use_internal_keccak_module',False):
from .contrib.keccak import keccak_256
qmsg('Using internal keccak module by user request')
return keccak_256
if not cached_ret:
from .opts import opt
# called in opts.init() via CoinProtocol, so must use getattr():
if getattr(opt,'use_internal_keccak_module',False):
qmsg('Using internal keccak module by user request')
from .contrib.keccak import keccak_256
else:
try:
from sha3 import keccak_256
except:
from .contrib.keccak import keccak_256
cached_ret.append(keccak_256)
try:
from sha3 import keccak_256
except:
from .contrib.keccak import keccak_256
return keccak_256
return cached_ret[0]
# From 'man dd':
# c=1, w=2, b=512, kB=1000, K=1024, MB=1000*1000, M=1024*1024,