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__main__.py
203 lines (165 loc) · 6.69 KB
/
__main__.py
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"""Support for natively asynchronous REPL with MPyC preloaded.
To launch a natively async REPL with MPyC preloaded, run:
python -m mpyc
This causes Python's asyncio to be preloaded as well, allowing code with
top-level await expressions to be evaluated directly (instead of using
calls to mpc.run() or asyncio.run() in top-level code).
Besides setting mpc as a handle for the MPyC runtime, also several secure
(secret-shared) types are predefined, effectively executing the following code:
from mpyc.runtime import mpc
secint = mpc.SecInt()
secfxp = mpc.SecFxp()
secflt = mpc.SecFlt()
secfld127 = mpc.SecFld(127)
secfld256 = mpc.SecFld(2**8)
secsym = mpc.SecSymmetricGroup(5)
secqr = mpc.SecQuadraticResidues(11)
secsg = mpc.SecSchnorrGroup(l=1024)
secec = mpc.SecEllipticCurve('Ed25519')
seccl = mpc.SecClassGroup(-23)
Type secint represents secure integers and types secfxp and secflt represent
secure fixed-point/floating-point numbers, all of default bit lengths. Types
secfld127 and secfld256 represent secure prime field GF(127)-elements and
secure binary field GF(2^8)-elements. Types secsym, secqr, secsg, secec, and
seccl represent secure finite group elements for five particular groups.
Other "popular" types etc. can easily be added here in the future.
"""
# The implementation is copied as much as possible from asyncio's __main__
# module. The major components are the two classes AsyncIOInteractiveConsole
# and REPLThread, and the function main(). The most important difference is
# that REPLthread now accepts an iterable preamble, which contains the lines
# of code to be executed at the start.
# If the module asyncio.__main__ becomes better reusable in the future, it
# should be possible to simply call the function asyncio.__main__ .main() say.
# Only the few lines of code at the very end will then remain.
import ast
import asyncio
import code
import concurrent.futures
import inspect
import sys
import threading
import types
import warnings
class AsyncIOInteractiveConsole(code.InteractiveConsole):
"""Adapted from asyncio.__main__.AsyncIOInteractiveConsole with minor changes only."""
def __init__(self, locals, loop=None):
super().__init__(locals)
self.compile.compiler.flags |= ast.PyCF_ALLOW_TOP_LEVEL_AWAIT
if not loop:
loop = asyncio.get_event_loop()
self.loop = loop
def runcode(self, code):
future = concurrent.futures.Future()
def callback():
global repl_future
global repl_future_interrupted
repl_future = None
repl_future_interrupted = False
func = types.FunctionType(code, self.locals)
try:
coro = func()
except SystemExit:
raise
except KeyboardInterrupt as ex:
repl_future_interrupted = True
future.set_exception(ex)
return
except BaseException as ex:
future.set_exception(ex)
return
if not inspect.iscoroutine(coro):
future.set_result(coro)
return
try:
repl_future = self.loop.create_task(coro)
asyncio.futures._chain_future(repl_future, future)
except BaseException as exc:
future.set_exception(exc)
self.loop.call_soon_threadsafe(callback)
try:
return future.result()
except SystemExit:
raise
except BaseException:
if repl_future_interrupted:
self.write('\nKeyboardInterrupt\n')
else:
self.showtraceback()
class REPLThread(threading.Thread):
"""Adapted from asyncio.__main__.REPLThread, introducing a preamble for the asyncio REPL."""
def __init__(self, console, preamble=(), loop=None):
super().__init__()
self.console = console
self.preamble = list(preamble)
if not loop:
loop = asyncio.get_event_loop()
self.loop = loop
def run(self):
try:
prompt = getattr(sys, 'ps1', '>>> ')
input_lines = ''.join([f'\n{prompt}{line}' for line in self.preamble])
banner = (
f'asyncio REPL {sys.version} on {sys.platform}\n'
f'Use "await" directly instead of "asyncio.run()".\n'
f'Type "help", "copyright", "credits" or "license" '
f'for more information.\n'
f'{prompt}import asyncio'
f'{input_lines}')
for line in self.preamble:
self.console.push(line) # NB: line does not appear in history
self.console.interact(
banner=banner,
exitmsg='exiting asyncio REPL...')
finally:
warnings.filterwarnings(
'ignore',
message=r'^coroutine .* was never awaited$',
category=RuntimeWarning)
self.loop.call_soon_threadsafe(self.loop.stop)
def main(preamble=()):
"""Adapted from the top-level code of the asyncio.__main__ module, no essential changes."""
global repl_future_interrupted
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
caller_locals = inspect.currentframe().f_back.f_locals
repl_locals = {}
for key in {'__name__', '__package__',
'__loader__', '__spec__',
'__builtins__', '__file__'}:
if key in caller_locals:
repl_locals[key] = caller_locals[key]
repl_locals['asyncio'] = asyncio
console = AsyncIOInteractiveConsole(repl_locals, loop)
repl_future = None
repl_future_interrupted = False
try:
import readline # NoQA
except ImportError:
pass
repl_thread = REPLThread(console, preamble, loop)
repl_thread.daemon = True
repl_thread.start()
while True:
try:
loop.run_forever()
except KeyboardInterrupt:
if repl_future and not repl_future.done():
repl_future.cancel()
repl_future_interrupted = True
continue
else:
break
if __name__ == '__main__':
preamble = ('from mpyc.runtime import mpc',
'secint = mpc.SecInt()',
'secfxp = mpc.SecFxp()',
'secflt = mpc.SecFlt()',
'secfld127 = mpc.SecFld(127)',
'secfld256 = mpc.SecFld(2**8)',
'secsym = mpc.SecSymmetricGroup(5)',
'secqr = mpc.SecQuadraticResidues(11)',
'secsg = mpc.SecSchnorrGroup(l=1024)',
"secec = mpc.SecEllipticCurve('Ed25519')",
'seccl = mpc.SecClassGroup(-23)')
main(preamble)