Yury Selivanov | 16cefb0 | 2019-05-27 13:42:29 +0200 | [diff] [blame] | 1 | import ast |
| 2 | import asyncio |
| 3 | import code |
| 4 | import concurrent.futures |
| 5 | import inspect |
| 6 | import sys |
| 7 | import threading |
| 8 | import types |
| 9 | import warnings |
| 10 | |
| 11 | from . import futures |
| 12 | |
| 13 | |
| 14 | class AsyncIOInteractiveConsole(code.InteractiveConsole): |
| 15 | |
| 16 | def __init__(self, locals, loop): |
| 17 | super().__init__(locals) |
| 18 | self.compile.compiler.flags |= ast.PyCF_ALLOW_TOP_LEVEL_AWAIT |
| 19 | |
| 20 | self.loop = loop |
| 21 | |
| 22 | def runcode(self, code): |
| 23 | future = concurrent.futures.Future() |
| 24 | |
| 25 | def callback(): |
| 26 | global repl_future |
| 27 | global repl_future_interrupted |
| 28 | |
| 29 | repl_future = None |
| 30 | repl_future_interrupted = False |
| 31 | |
| 32 | func = types.FunctionType(code, self.locals) |
| 33 | try: |
| 34 | coro = func() |
| 35 | except SystemExit: |
| 36 | raise |
| 37 | except KeyboardInterrupt as ex: |
| 38 | repl_future_interrupted = True |
| 39 | future.set_exception(ex) |
| 40 | return |
| 41 | except BaseException as ex: |
| 42 | future.set_exception(ex) |
| 43 | return |
| 44 | |
| 45 | if not inspect.iscoroutine(coro): |
| 46 | future.set_result(coro) |
| 47 | return |
| 48 | |
| 49 | try: |
| 50 | repl_future = self.loop.create_task(coro) |
| 51 | futures._chain_future(repl_future, future) |
| 52 | except BaseException as exc: |
| 53 | future.set_exception(exc) |
| 54 | |
| 55 | loop.call_soon_threadsafe(callback) |
| 56 | |
| 57 | try: |
| 58 | return future.result() |
| 59 | except SystemExit: |
| 60 | raise |
| 61 | except BaseException: |
| 62 | if repl_future_interrupted: |
| 63 | self.write("\nKeyboardInterrupt\n") |
| 64 | else: |
| 65 | self.showtraceback() |
| 66 | |
| 67 | |
| 68 | class REPLThread(threading.Thread): |
| 69 | |
| 70 | def run(self): |
| 71 | try: |
| 72 | banner = ( |
| 73 | f'asyncio REPL {sys.version} on {sys.platform}\n' |
| 74 | f'Use "await" directly instead of "asyncio.run()".\n' |
| 75 | f'Type "help", "copyright", "credits" or "license" ' |
| 76 | f'for more information.\n' |
| 77 | f'{getattr(sys, "ps1", ">>> ")}import asyncio' |
| 78 | ) |
| 79 | |
| 80 | console.interact( |
| 81 | banner=banner, |
| 82 | exitmsg='exiting asyncio REPL...') |
| 83 | finally: |
| 84 | warnings.filterwarnings( |
| 85 | 'ignore', |
| 86 | message=r'^coroutine .* was never awaited$', |
| 87 | category=RuntimeWarning) |
| 88 | |
| 89 | loop.call_soon_threadsafe(loop.stop) |
| 90 | |
| 91 | |
| 92 | if __name__ == '__main__': |
| 93 | loop = asyncio.new_event_loop() |
| 94 | asyncio.set_event_loop(loop) |
| 95 | |
| 96 | repl_locals = {'asyncio': asyncio} |
| 97 | for key in {'__name__', '__package__', |
| 98 | '__loader__', '__spec__', |
| 99 | '__builtins__', '__file__'}: |
| 100 | repl_locals[key] = locals()[key] |
| 101 | |
| 102 | console = AsyncIOInteractiveConsole(repl_locals, loop) |
| 103 | |
| 104 | repl_future = None |
| 105 | repl_future_interrupted = False |
| 106 | |
| 107 | try: |
| 108 | import readline # NoQA |
| 109 | except ImportError: |
| 110 | pass |
| 111 | |
| 112 | repl_thread = REPLThread() |
| 113 | repl_thread.daemon = True |
| 114 | repl_thread.start() |
| 115 | |
| 116 | while True: |
| 117 | try: |
| 118 | loop.run_forever() |
| 119 | except KeyboardInterrupt: |
| 120 | if repl_future and not repl_future.done(): |
| 121 | repl_future.cancel() |
| 122 | repl_future_interrupted = True |
| 123 | continue |
| 124 | else: |
| 125 | break |