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EDIT :: fake_popen.py

"""FakePopen class declaration""" import asyncio import collections.abc import concurrent.futures import copy import io import os import signal import subprocess import sys import time from functools import partial from typing import Any as AnyType from typing import Callable from typing import Dict from typing import IO from typing import List from typing import Optional from typing import Sequence from typing import Tuple from typing import Union from . import exceptions from .types import BUFFER from .types import OPTIONAL_TEXT from .types import OPTIONAL_TEXT_OR_ITERABLE from .utils import Thread if sys.platform.startswith("win") and sys.version_info < (3, 8): COMMAND_SEQ = Sequence[Union[str, bytes]] else: COMMAND_SEQ = Sequence[Union[str, bytes, "os.PathLike[str]", "os.PathLike[bytes]"]] class FakePopen: """Base class that fakes the real subprocess.Popen()""" stdout: Optional[BUFFER] = None stderr: Optional[BUFFER] = None returncode: Optional[int] = None text_mode: bool = False pid: int = 0 def __init__( self, command: Union[ Union[bytes, str], COMMAND_SEQ, ], stdout: OPTIONAL_TEXT_OR_ITERABLE = None, stderr: OPTIONAL_TEXT_OR_ITERABLE = None, returncode: int = 0, wait: Optional[float] = None, callback: Optional[Callable] = None, callback_kwargs: Optional[Dict[str, AnyType]] = None, signal_callback: Optional[Callable] = None, stdin_callable: Optional[Callable] = None, **_: Dict[str, AnyType], ) -> None: if ( not isinstance(command, (str, bytes)) and sys.platform.startswith("win") and sys.version_info < (3, 8) ): for arg in command: if isinstance(arg, os.PathLike): msg = f"argument of type {arg.__class__.__name__!r} is not iterable" raise TypeError(msg) self.args = command self.__kwargs: Optional[Dict[str, AnyType]] = None self.__stdout: OPTIONAL_TEXT_OR_ITERABLE = stdout self.__stderr: OPTIONAL_TEXT_OR_ITERABLE = stderr self.__thread: Optional[Thread] = None self.__signal_callback: Optional[Callable] = signal_callback self.__stdin_callable: Optional[Optional[Callable]] = stdin_callable self.__universal_newlines: Optional[Dict[AnyType, AnyType]] = None self._signals: List[int] = [] self._returncode: Optional[int] = returncode self._wait_timeout: Optional[float] = wait self._callback: Optional[Optional[Callable]] = callback self._callback_kwargs: Optional[Dict[str, AnyType]] = callback_kwargs @property def kwargs(self) -> Optional[Dict[str, AnyType]]: return self.__kwargs def __enter__(self) -> "FakePopen": return self def __exit__(self, *args: List, **kwargs: Dict) -> None: if self.__thread and self.__thread.exception: raise self.__thread.exception def communicate( self, input: OPTIONAL_TEXT = None, timeout: Optional[float] = None ) -> Tuple[AnyType, AnyType]: self._handle_stdin(input) self._finalize_thread(timeout) if isinstance(self.stdout, asyncio.StreamReader) or isinstance( self.stderr, asyncio.StreamReader ): raise exceptions.PluginInternalError return ( self.stdout.getvalue() if self.stdout else None, self.stderr.getvalue() if self.stderr else None, ) def _handle_stdin(self, input: OPTIONAL_TEXT) -> None: if input and self.__stdin_callable: callable_output = self.__stdin_callable(input) if isinstance(callable_output, dict): self.stdout = self._extend_stream_from_dict( callable_output, "stdout", self.stdout ) self.stderr = self._extend_stream_from_dict( callable_output, "stderr", self.stderr ) def _finalize_thread(self, timeout: Optional[float]) -> None: if self.__thread is None: return self.__thread.join(timeout) if self.returncode is None and self._returncode is not None: self.returncode = self._returncode if self.__thread.exception: raise self.__thread.exception def _extend_stream_from_dict( self, dictionary: Dict[str, AnyType], key: str, stream: Optional[BUFFER] ) -> Optional[BUFFER]: data = dictionary.get(key) if data: return self._prepare_buffer(input=data, io_base=stream) return None def poll(self) -> Optional[int]: return self.returncode def wait(self, timeout: Optional[float] = None) -> int: if timeout and self._wait_timeout: self._wait_timeout -= timeout if timeout < self._wait_timeout: raise subprocess.TimeoutExpired(self.args, timeout) self._finalize_thread(timeout) if self.returncode is None: raise exceptions.PluginInternalError return self.returncode def send_signal(self, sig: int) -> None: self._signals.append(sig) if self.__signal_callback: self.__signal_callback(self, sig) def terminate(self) -> None: self.send_signal(signal.SIGTERM) def kill(self) -> None: if sys.platform == "win32": self.terminate() else: self.send_signal(signal.SIGKILL) def configure(self, **kwargs: Optional[Dict]) -> None: """Setup the FakePopen instance based on a real Popen arguments.""" self.__kwargs = self.safe_copy(kwargs) self.__universal_newlines = kwargs.get("universal_newlines", None) text = kwargs.get("text", None) encoding = kwargs.get("encoding", None) errors = kwargs.get("errors", None) if text and sys.version_info < (3, 7): raise TypeError("__init__() got an unexpected keyword argument 'text'") self.text_mode = bool(text or self.__universal_newlines or encoding or errors) # validation taken from the real subprocess if ( text is not None and self.__universal_newlines is not None and bool(self.__universal_newlines) != bool(text) ): raise subprocess.SubprocessError( "Cannot disambiguate when both text " "and universal_newlines are supplied but " "different. Pass one or the other." ) stdout = kwargs.get("stdout") if stdout == subprocess.PIPE: self.stdout = self._prepare_buffer(self.__stdout) elif isinstance(stdout, (io.BufferedWriter, io.TextIOWrapper)): self._write_to_buffer(self.__stdout, stdout) stderr = kwargs.get("stderr") if stderr == subprocess.STDOUT and self.__stderr: assert self.stdout is not None self.stdout = self._prepare_buffer(self.__stderr, self.stdout) elif stderr == subprocess.PIPE: self.stderr = self._prepare_buffer(self.__stderr) elif isinstance(stderr, (io.BufferedWriter, io.TextIOWrapper)): self._write_to_buffer(self.__stderr, stderr) @staticmethod def safe_copy(kwargs: Dict[str, AnyType]) -> Dict[str, AnyType]: """ Deepcopy can fail if the value is not serializable, fallback to shallow copy. """ try: return copy.deepcopy(kwargs) except TypeError: return dict(**kwargs) def _prepare_buffer( self, input: OPTIONAL_TEXT_OR_ITERABLE, io_base: Optional[BUFFER] = None, ) -> Union[io.BytesIO, io.StringIO, asyncio.StreamReader]: linesep = self._convert(os.linesep) if isinstance(input, (list, tuple)): # need to disable mypy, as input and linesep are unions, # mypy thinks that the types might be incompatible, but # the _convert() function handles that input = linesep.join(map(self._convert, input)) # type: ignore # Add trailing newline if data is present. if input: # same reason to disable mypy as above input += linesep # type: ignore if isinstance(input, str) and not self.text_mode: input = input.encode() if isinstance(input, bytes) and self.text_mode: input = input.decode() if input and self.__universal_newlines and isinstance(input, str): input = input.replace("\r\n", "\n") if ( io_base and not isinstance(io_base, asyncio.StreamReader) and io_base.tell() == 0 ): # same reason for disabling mypy as in `input = linesep.join...`: # both are union so could be incompatible if not _convert() input = io_base.getvalue() + (input) # type: ignore if io_base is None: io_base = self._get_empty_buffer(self.text_mode) if input is None: return io_base # similar as above - mypy has to be disabled because unions if isinstance(io_base, asyncio.StreamReader): io_base.feed_data(self._data_to_bytes(input)) else: io_base.write(input) # type: ignore return io_base def _get_empty_buffer(self, text: bool) -> BUFFER: return io.StringIO() if text else io.BytesIO() def _to_bytes(self, data: Sequence[Union[str, bytes]]) -> Sequence[bytes]: return [elem if isinstance(elem, bytes) else elem.encode() for elem in data] def _data_to_bytes(self, data: OPTIONAL_TEXT_OR_ITERABLE) -> bytes: if isinstance(data, collections.abc.Sequence) and not isinstance(data, bytes): return b"\n".join( (item if isinstance(item, bytes) else item.encode() for item in data) ) if isinstance(data, str): return data.encode() if not data: return b"" return data def _write_to_buffer(self, data: OPTIONAL_TEXT_OR_ITERABLE, buffer: IO) -> None: data_type: Callable = ( # mypy doesn't seem to recognize `partial` as a function partial(bytes, encoding=sys.getfilesystemencoding()) # type: ignore if "b" in buffer.mode else str ) if isinstance(data, (list, tuple)): buffer.writelines([data_type(line + "\n") for line in data]) else: buffer.write(data_type(data)) def _convert(self, input: Union[str, bytes]) -> Union[str, bytes]: if isinstance(input, bytes) and self.text_mode: return input.decode() if isinstance(input, str) and not self.text_mode: return input.encode() return input def _wait(self, wait_period: float) -> None: time.sleep(wait_period) if self.returncode is None: self._finish_process() def run_thread(self) -> None: """Run the user-defined callback or wait in a thread.""" if self._wait_timeout is None and self._callback is None: self._finish_process() else: if self._callback: self.__thread = Thread( target=self._callback, args=(self,), kwargs=self._callback_kwargs or {}, ) else: self.__thread = Thread(target=self._wait, args=(self._wait_timeout,)) self.__thread.start() def _finish_process(self) -> None: self.returncode = self._returncode self._finalize_streams() def _finalize_streams(self) -> None: self._finalize_stream(self.stdout) self._finalize_stream(self.stderr) def _finalize_stream(self, stream: Optional[BUFFER]) -> None: if isinstance(stream, asyncio.StreamReader): stream.feed_eof() elif stream: stream.seek(0) def received_signals(self) -> Tuple[int, ...]: """Get a tuple of signals received by the process.""" return tuple(self._signals) class AsyncFakePopen(FakePopen): """Class to handle async processes""" stdout: Optional[asyncio.StreamReader] stderr: Optional[asyncio.StreamReader] async def communicate( # type: ignore self, input: OPTIONAL_TEXT = None, timeout: Optional[float] = None ) -> Tuple[AnyType, AnyType]: if input: # streams were fed with eof, need to be reopened await self._reopen_streams() self._handle_stdin(input) # feed eof one more time as streams were opened self._finalize_streams() await self._finalize(timeout) return ( await self.stdout.read() if self.stdout else None, await self.stderr.read() if self.stderr else None, ) async def wait(self, timeout: Optional[float] = None) -> int: # type: ignore if timeout and self._wait_timeout and timeout < self._wait_timeout: self._wait_timeout -= timeout raise subprocess.TimeoutExpired(self.args, timeout) await self._finalize(timeout) if self.returncode is None: raise exceptions.PluginInternalError return self.returncode def _get_empty_buffer(self, _: bool) -> asyncio.StreamReader: return asyncio.StreamReader() async def _reopen_streams(self) -> None: self.stdout = await self._reopen_stream(self.stdout) self.stderr = await self._reopen_stream(self.stderr) async def _reopen_stream( self, stream: Optional[asyncio.StreamReader] ) -> Optional[asyncio.StreamReader]: if stream: data = await stream.read() fresh_stream = self._get_empty_buffer(False) fresh_stream.feed_data(data) return fresh_stream return None def run_thread(self) -> None: """Async impl should not contain any thread based implementation""" def evaluate(self) -> None: """Check if process needs to be finished.""" if self._wait_timeout is None and self._callback is None: self._finish_process() async def _run_callback_in_executor(self) -> None: """Run in executor the user-defined callback or wait.""" loop = asyncio.get_running_loop() with concurrent.futures.ThreadPoolExecutor() as pool: if self._callback: kwargs = self._callback_kwargs or {} cbk = partial(self._callback, **kwargs) await loop.run_in_executor(pool, cbk, self) elif self._wait_timeout is not None: await loop.run_in_executor(pool, self._wait, self._wait_timeout) async def _finalize(self, timeout: Optional[float] = None) -> None: """Run the user-defined callback or wait. Finish process""" if self.returncode is not None: return if timeout is not None: await asyncio.wait_for(self._run_callback_in_executor(), timeout=timeout) else: await self._run_callback_in_executor() if self.returncode is None: self.returncode = self._returncode self._finalize_streams()

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