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popen.py
import pipes from functools import wraps, partial, reduce from io import TextIOWrapper from itertools import chain, zip_longest from subprocess import STDOUT, PIPE from tempfile import TemporaryFile from testfixtures.utils import extend_docstring from typing import Union, Callable, List, Optional, Sequence, Tuple, Dict from .mock import Mock, call, _Call as Call AnyStr = Union[str, bytes] Command = Union[str, Sequence[str]] def shell_join(command: Command) -> str: if not isinstance(command, str): command = " ".join(pipes.quote(part) for part in command) return command class PopenBehaviour(object): """ An object representing the behaviour of a :class:`MockPopen` when simulating a particular command. """ def __init__( self, stdout: bytes = b'', stderr: bytes = b'', returncode: int = 0, pid: int = 1234, poll_count: int = 3 ): self.stdout = stdout self.stderr = stderr self.returncode = returncode self.pid = pid self.poll_count = poll_count def record(func) -> Callable: @wraps(func) def recorder(self, *args, **kw): self._record((func.__name__,), *args, **kw) return func(self, *args, **kw) return recorder class MockPopenInstance(object): """ A mock process as returned by :class:`MockPopen`. """ #: A :class:`~unittest.mock.Mock` representing the pipe into this process. #: This is only set if ``stdin=PIPE`` is passed the constructor. #: The mock records writes and closes in :attr:`MockPopen.all_calls`. stdin: Mock = None #: A file representing standard output from this process. stdout: TemporaryFile = None #: A file representing error output from this process. stderr: TemporaryFile = None # These are not types as instantiation of this class is an internal implementation detail. def __init__(self, mock_class, root_call, args, bufsize=0, executable=None, stdin=None, stdout=None, stderr=None, preexec_fn=None, close_fds=False, shell=False, cwd=None, env=None, universal_newlines=False, startupinfo=None, creationflags=0, restore_signals=True, start_new_session=False, pass_fds=(), encoding=None, errors=None, text=None): self.mock: Mock = Mock() self.class_instance_mock: Mock = mock_class.mock.Popen_instance #: A :func:`unittest.mock.call` representing the call made to instantiate #: this mock process. self.root_call: Call = root_call #: The calls made on this mock process, represented using #: :func:`~unittest.mock.call` instances. self.calls: List[Call] = [] self.all_calls: List[Call] = mock_class.all_calls cmd = shell_join(args) behaviour = mock_class.commands.get(cmd, mock_class.default_behaviour) if behaviour is None: raise KeyError('Nothing specified for command %r' % cmd) if callable(behaviour): behaviour = behaviour(command=cmd, stdin=stdin) self.behaviour: PopenBehaviour = behaviour stdout_value = behaviour.stdout stderr_value = behaviour.stderr if stderr == STDOUT: line_iterator = chain.from_iterable(zip_longest( stdout_value.splitlines(True), stderr_value.splitlines(True) )) stdout_value = b''.join(l for l in line_iterator if l) stderr_value = None self.poll_count: int = behaviour.poll_count for name, option, mock_value in ( ('stdout', stdout, stdout_value), ('stderr', stderr, stderr_value) ): value = None if option is PIPE: value = TemporaryFile() value.write(mock_value) value.flush() value.seek(0) if universal_newlines or text or encoding: value = TextIOWrapper(value, encoding=encoding, errors=errors) setattr(self, name, value) if stdin == PIPE: self.stdin = Mock() for method in 'write', 'close': record_writes = partial(self._record, ('stdin', method)) getattr(self.stdin, method).side_effect = record_writes self.pid: int = behaviour.pid #: The return code of this mock process. self.returncode: Optional[int] = None self.args: Command = args def _record(self, names, *args, **kw): for mock in self.class_instance_mock, self.mock: reduce(getattr, names, mock)(*args, **kw) for base_call, store in ( (call, self.calls), (self.root_call, self.all_calls) ): store.append(reduce(getattr, names, base_call)(*args, **kw)) def __enter__(self): return self def __exit__(self, exc_type, exc_val, exc_tb): self.wait() for stream in self.stdout, self.stderr: if stream: stream.close() @record def wait(self, timeout: float = None) -> int: "Simulate calls to :meth:`subprocess.Popen.wait`" self.returncode = self.behaviour.returncode return self.returncode @record def communicate(self, input: AnyStr = None, timeout: float = None) -> Tuple[AnyStr, AnyStr]: "Simulate calls to :meth:`subprocess.Popen.communicate`" self.returncode = self.behaviour.returncode return (self.stdout and self.stdout.read(), self.stderr and self.stderr.read()) @record def poll(self) -> Optional[int]: "Simulate calls to :meth:`subprocess.Popen.poll`" while self.poll_count and self.returncode is None: self.poll_count -= 1 return None # This call to wait() is NOT how poll() behaves in reality. # poll() NEVER sets the returncode. # The returncode is *only* ever set by process completion. # The following is an artifact of the fixture's implementation. self.returncode = self.behaviour.returncode return self.returncode @record def send_signal(self, signal: int) -> None: "Simulate calls to :meth:`subprocess.Popen.send_signal`" pass @record def terminate(self) -> None: "Simulate calls to :meth:`subprocess.Popen.terminate`" pass @record def kill(self) -> None: "Simulate calls to :meth:`subprocess.Popen.kill`" pass class MockPopen(object): """ A specialised mock for testing use of :class:`subprocess.Popen`. An instance of this class can be used in place of the :class:`subprocess.Popen` and is often inserted where it's needed using :func:`unittest.mock.patch` or a :class:`~testfixtures.Replacer`. """ default_behaviour: PopenBehaviour = None def __init__(self): self.commands: Dict[str, PopenBehaviour] = {} self.mock: Mock = Mock() #: All calls made using this mock and the objects it returns, represented using #: :func:`~unittest.mock.call` instances. self.all_calls: List[Call] = [] def _resolve_behaviour(self, stdout, stderr, returncode, pid, poll_count, behaviour): if behaviour is None: return PopenBehaviour( stdout, stderr, returncode, pid, poll_count ) else: return behaviour def set_command( self, command: str, stdout: bytes = b'', stderr: bytes = b'', returncode: int = 0, pid: int = 1234, poll_count: int = 3, behaviour: Union[PopenBehaviour, Callable] = None ): """ Set the behaviour of this mock when it is used to simulate the specified command. :param command: A :class:`str` representing the command to be simulated. """ self.commands[shell_join(command)] = self._resolve_behaviour( stdout, stderr, returncode, pid, poll_count, behaviour ) def set_default(self, stdout=b'', stderr=b'', returncode=0, pid=1234, poll_count=3, behaviour=None): """ Set the behaviour of this mock when it is used to simulate commands that have no explicit behavior specified using :meth:`~MockPopen.set_command`. """ self.default_behaviour = self._resolve_behaviour( stdout, stderr, returncode, pid, poll_count, behaviour ) def __call__(self, *args, **kw): self.mock.Popen(*args, **kw) root_call = call.Popen(*args, **kw) self.all_calls.append(root_call) return MockPopenInstance(self, root_call, *args, **kw) set_command_params = """ :param stdout: :class:`bytes` representing the simulated content written by the process to the stdout pipe. :param stderr: :class:`bytes` representing the simulated content written by the process to the stderr pipe. :param returncode: An integer representing the return code of the simulated process. :param pid: An integer representing the process identifier of the simulated process. This is useful if you have code the prints out the pids of running processes. :param poll_count: Specifies the number of times :meth:`~MockPopenInstance.poll` can be called before :attr:`~MockPopenInstance.returncode` is set and returned by :meth:`~MockPopenInstance.poll`. If supplied, ``behaviour`` must be either a :class:`PopenBehaviour` instance or a callable that takes the ``command`` string representing the command to be simulated and the ``stdin`` supplied when instantiating the :class:`subprocess.Popen` with that command and should return a :class:`PopenBehaviour` instance. """ # add the param docs, so we only have one copy of them! extend_docstring(set_command_params, [MockPopen.set_command, MockPopen.set_default])
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