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This makes it easy to play with asyncio APIs with simply using async/await in the REPL.
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import ast | ||
import asyncio | ||
import code | ||
import concurrent.futures | ||
import inspect | ||
import sys | ||
import threading | ||
import types | ||
import warnings | ||
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from . import futures | ||
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class AsyncIOInteractiveConsole(code.InteractiveConsole): | ||
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def __init__(self, locals, loop): | ||
super().__init__(locals) | ||
self.compile.compiler.flags |= ast.PyCF_ALLOW_TOP_LEVEL_AWAIT | ||
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self.loop = loop | ||
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def runcode(self, code): | ||
future = concurrent.futures.Future() | ||
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def callback(): | ||
global repl_future | ||
global repl_future_interrupted | ||
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repl_future = None | ||
repl_future_interrupted = False | ||
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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 | ||
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if not inspect.iscoroutine(coro): | ||
future.set_result(coro) | ||
return | ||
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try: | ||
repl_future = self.loop.create_task(coro) | ||
futures._chain_future(repl_future, future) | ||
except BaseException as exc: | ||
future.set_exception(exc) | ||
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loop.call_soon_threadsafe(callback) | ||
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try: | ||
return future.result() | ||
except SystemExit: | ||
raise | ||
except BaseException: | ||
if repl_future_interrupted: | ||
self.write("\nKeyboardInterrupt\n") | ||
else: | ||
self.showtraceback() | ||
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class REPLThread(threading.Thread): | ||
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def run(self): | ||
try: | ||
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'{getattr(sys, "ps1", ">>> ")}import asyncio' | ||
) | ||
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console.interact( | ||
banner=banner, | ||
exitmsg='exiting asyncio REPL...') | ||
finally: | ||
warnings.filterwarnings( | ||
'ignore', | ||
message=r'^coroutine .* was never awaited$', | ||
category=RuntimeWarning) | ||
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loop.call_soon_threadsafe(loop.stop) | ||
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if __name__ == '__main__': | ||
loop = asyncio.new_event_loop() | ||
asyncio.set_event_loop(loop) | ||
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repl_locals = {'asyncio': asyncio} | ||
for key in {'__name__', '__package__', | ||
'__loader__', '__spec__', | ||
'__builtins__', '__file__'}: | ||
repl_locals[key] = locals()[key] | ||
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console = AsyncIOInteractiveConsole(repl_locals, loop) | ||
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repl_future = None | ||
repl_future_interrupted = False | ||
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try: | ||
import readline # NoQA | ||
except ImportError: | ||
pass | ||
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repl_thread = REPLThread() | ||
repl_thread.daemon = True | ||
repl_thread.start() | ||
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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 |
1 change: 1 addition & 0 deletions
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Misc/NEWS.d/next/Library/2019-05-23-18-57-34.bpo-37028.Vse6Pj.rst
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Implement asyncio REPL |