480 lines
16 KiB
Python
480 lines
16 KiB
Python
import contextlib
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import io
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import os
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import shlex
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import shutil
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import sys
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import tempfile
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import typing as t
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from types import TracebackType
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from . import formatting
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from . import termui
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from . import utils
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from ._compat import _find_binary_reader
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if t.TYPE_CHECKING:
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from .core import BaseCommand
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class EchoingStdin:
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def __init__(self, input: t.BinaryIO, output: t.BinaryIO) -> None:
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self._input = input
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self._output = output
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self._paused = False
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def __getattr__(self, x: str) -> t.Any:
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return getattr(self._input, x)
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def _echo(self, rv: bytes) -> bytes:
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if not self._paused:
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self._output.write(rv)
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return rv
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def read(self, n: int = -1) -> bytes:
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return self._echo(self._input.read(n))
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def read1(self, n: int = -1) -> bytes:
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return self._echo(self._input.read1(n)) # type: ignore
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def readline(self, n: int = -1) -> bytes:
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return self._echo(self._input.readline(n))
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def readlines(self) -> t.List[bytes]:
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return [self._echo(x) for x in self._input.readlines()]
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def __iter__(self) -> t.Iterator[bytes]:
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return iter(self._echo(x) for x in self._input)
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def __repr__(self) -> str:
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return repr(self._input)
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@contextlib.contextmanager
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def _pause_echo(stream: t.Optional[EchoingStdin]) -> t.Iterator[None]:
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if stream is None:
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yield
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else:
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stream._paused = True
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yield
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stream._paused = False
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class _NamedTextIOWrapper(io.TextIOWrapper):
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def __init__(
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self, buffer: t.BinaryIO, name: str, mode: str, **kwargs: t.Any
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) -> None:
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super().__init__(buffer, **kwargs)
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self._name = name
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self._mode = mode
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@property
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def name(self) -> str:
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return self._name
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@property
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def mode(self) -> str:
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return self._mode
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def make_input_stream(
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input: t.Optional[t.Union[str, bytes, t.IO]], charset: str
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) -> t.BinaryIO:
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# Is already an input stream.
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if hasattr(input, "read"):
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rv = _find_binary_reader(t.cast(t.IO, input))
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if rv is not None:
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return rv
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raise TypeError("Could not find binary reader for input stream.")
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if input is None:
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input = b""
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elif isinstance(input, str):
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input = input.encode(charset)
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return io.BytesIO(t.cast(bytes, input))
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class Result:
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"""Holds the captured result of an invoked CLI script."""
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def __init__(
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self,
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runner: "CliRunner",
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stdout_bytes: bytes,
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stderr_bytes: t.Optional[bytes],
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return_value: t.Any,
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exit_code: int,
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exception: t.Optional[BaseException],
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exc_info: t.Optional[
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t.Tuple[t.Type[BaseException], BaseException, TracebackType]
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] = None,
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):
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#: The runner that created the result
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self.runner = runner
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#: The standard output as bytes.
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self.stdout_bytes = stdout_bytes
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#: The standard error as bytes, or None if not available
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self.stderr_bytes = stderr_bytes
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#: The value returned from the invoked command.
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#:
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#: .. versionadded:: 8.0
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self.return_value = return_value
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#: The exit code as integer.
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self.exit_code = exit_code
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#: The exception that happened if one did.
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self.exception = exception
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#: The traceback
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self.exc_info = exc_info
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@property
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def output(self) -> str:
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"""The (standard) output as unicode string."""
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return self.stdout
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@property
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def stdout(self) -> str:
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"""The standard output as unicode string."""
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return self.stdout_bytes.decode(self.runner.charset, "replace").replace(
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"\r\n", "\n"
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)
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@property
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def stderr(self) -> str:
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"""The standard error as unicode string."""
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if self.stderr_bytes is None:
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raise ValueError("stderr not separately captured")
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return self.stderr_bytes.decode(self.runner.charset, "replace").replace(
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"\r\n", "\n"
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)
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def __repr__(self) -> str:
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exc_str = repr(self.exception) if self.exception else "okay"
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return f"<{type(self).__name__} {exc_str}>"
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class CliRunner:
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"""The CLI runner provides functionality to invoke a Click command line
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script for unittesting purposes in a isolated environment. This only
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works in single-threaded systems without any concurrency as it changes the
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global interpreter state.
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:param charset: the character set for the input and output data.
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:param env: a dictionary with environment variables for overriding.
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:param echo_stdin: if this is set to `True`, then reading from stdin writes
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to stdout. This is useful for showing examples in
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some circumstances. Note that regular prompts
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will automatically echo the input.
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:param mix_stderr: if this is set to `False`, then stdout and stderr are
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preserved as independent streams. This is useful for
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Unix-philosophy apps that have predictable stdout and
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noisy stderr, such that each may be measured
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independently
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"""
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def __init__(
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self,
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charset: str = "utf-8",
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env: t.Optional[t.Mapping[str, t.Optional[str]]] = None,
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echo_stdin: bool = False,
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mix_stderr: bool = True,
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) -> None:
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self.charset = charset
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self.env = env or {}
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self.echo_stdin = echo_stdin
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self.mix_stderr = mix_stderr
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def get_default_prog_name(self, cli: "BaseCommand") -> str:
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"""Given a command object it will return the default program name
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for it. The default is the `name` attribute or ``"root"`` if not
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set.
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"""
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return cli.name or "root"
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def make_env(
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self, overrides: t.Optional[t.Mapping[str, t.Optional[str]]] = None
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) -> t.Mapping[str, t.Optional[str]]:
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"""Returns the environment overrides for invoking a script."""
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rv = dict(self.env)
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if overrides:
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rv.update(overrides)
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return rv
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@contextlib.contextmanager
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def isolation(
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self,
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input: t.Optional[t.Union[str, bytes, t.IO]] = None,
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env: t.Optional[t.Mapping[str, t.Optional[str]]] = None,
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color: bool = False,
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) -> t.Iterator[t.Tuple[io.BytesIO, t.Optional[io.BytesIO]]]:
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"""A context manager that sets up the isolation for invoking of a
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command line tool. This sets up stdin with the given input data
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and `os.environ` with the overrides from the given dictionary.
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This also rebinds some internals in Click to be mocked (like the
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prompt functionality).
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This is automatically done in the :meth:`invoke` method.
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:param input: the input stream to put into sys.stdin.
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:param env: the environment overrides as dictionary.
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:param color: whether the output should contain color codes. The
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application can still override this explicitly.
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.. versionchanged:: 8.0
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``stderr`` is opened with ``errors="backslashreplace"``
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instead of the default ``"strict"``.
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.. versionchanged:: 4.0
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Added the ``color`` parameter.
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"""
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bytes_input = make_input_stream(input, self.charset)
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echo_input = None
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old_stdin = sys.stdin
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old_stdout = sys.stdout
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old_stderr = sys.stderr
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old_forced_width = formatting.FORCED_WIDTH
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formatting.FORCED_WIDTH = 80
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env = self.make_env(env)
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bytes_output = io.BytesIO()
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if self.echo_stdin:
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bytes_input = echo_input = t.cast(
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t.BinaryIO, EchoingStdin(bytes_input, bytes_output)
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)
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sys.stdin = text_input = _NamedTextIOWrapper(
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bytes_input, encoding=self.charset, name="<stdin>", mode="r"
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)
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if self.echo_stdin:
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# Force unbuffered reads, otherwise TextIOWrapper reads a
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# large chunk which is echoed early.
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text_input._CHUNK_SIZE = 1 # type: ignore
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sys.stdout = _NamedTextIOWrapper(
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bytes_output, encoding=self.charset, name="<stdout>", mode="w"
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)
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bytes_error = None
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if self.mix_stderr:
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sys.stderr = sys.stdout
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else:
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bytes_error = io.BytesIO()
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sys.stderr = _NamedTextIOWrapper(
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bytes_error,
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encoding=self.charset,
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name="<stderr>",
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mode="w",
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errors="backslashreplace",
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)
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@_pause_echo(echo_input) # type: ignore
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def visible_input(prompt: t.Optional[str] = None) -> str:
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sys.stdout.write(prompt or "")
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val = text_input.readline().rstrip("\r\n")
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sys.stdout.write(f"{val}\n")
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sys.stdout.flush()
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return val
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@_pause_echo(echo_input) # type: ignore
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def hidden_input(prompt: t.Optional[str] = None) -> str:
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sys.stdout.write(f"{prompt or ''}\n")
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sys.stdout.flush()
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return text_input.readline().rstrip("\r\n")
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@_pause_echo(echo_input) # type: ignore
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def _getchar(echo: bool) -> str:
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char = sys.stdin.read(1)
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if echo:
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sys.stdout.write(char)
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sys.stdout.flush()
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return char
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default_color = color
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def should_strip_ansi(
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stream: t.Optional[t.IO] = None, color: t.Optional[bool] = None
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) -> bool:
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if color is None:
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return not default_color
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return not color
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old_visible_prompt_func = termui.visible_prompt_func
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old_hidden_prompt_func = termui.hidden_prompt_func
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old__getchar_func = termui._getchar
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old_should_strip_ansi = utils.should_strip_ansi # type: ignore
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termui.visible_prompt_func = visible_input
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termui.hidden_prompt_func = hidden_input
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termui._getchar = _getchar
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utils.should_strip_ansi = should_strip_ansi # type: ignore
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old_env = {}
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try:
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for key, value in env.items():
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old_env[key] = os.environ.get(key)
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if value is None:
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try:
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del os.environ[key]
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except Exception:
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pass
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else:
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os.environ[key] = value
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yield (bytes_output, bytes_error)
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finally:
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for key, value in old_env.items():
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if value is None:
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try:
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del os.environ[key]
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except Exception:
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pass
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else:
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os.environ[key] = value
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sys.stdout = old_stdout
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sys.stderr = old_stderr
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sys.stdin = old_stdin
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termui.visible_prompt_func = old_visible_prompt_func
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termui.hidden_prompt_func = old_hidden_prompt_func
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termui._getchar = old__getchar_func
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utils.should_strip_ansi = old_should_strip_ansi # type: ignore
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formatting.FORCED_WIDTH = old_forced_width
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def invoke(
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self,
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cli: "BaseCommand",
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args: t.Optional[t.Union[str, t.Sequence[str]]] = None,
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input: t.Optional[t.Union[str, bytes, t.IO]] = None,
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env: t.Optional[t.Mapping[str, t.Optional[str]]] = None,
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catch_exceptions: bool = True,
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color: bool = False,
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**extra: t.Any,
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) -> Result:
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"""Invokes a command in an isolated environment. The arguments are
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forwarded directly to the command line script, the `extra` keyword
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arguments are passed to the :meth:`~clickpkg.Command.main` function of
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the command.
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This returns a :class:`Result` object.
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:param cli: the command to invoke
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:param args: the arguments to invoke. It may be given as an iterable
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or a string. When given as string it will be interpreted
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as a Unix shell command. More details at
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:func:`shlex.split`.
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:param input: the input data for `sys.stdin`.
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:param env: the environment overrides.
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:param catch_exceptions: Whether to catch any other exceptions than
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``SystemExit``.
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:param extra: the keyword arguments to pass to :meth:`main`.
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:param color: whether the output should contain color codes. The
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application can still override this explicitly.
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.. versionchanged:: 8.0
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The result object has the ``return_value`` attribute with
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the value returned from the invoked command.
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.. versionchanged:: 4.0
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Added the ``color`` parameter.
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.. versionchanged:: 3.0
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Added the ``catch_exceptions`` parameter.
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.. versionchanged:: 3.0
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The result object has the ``exc_info`` attribute with the
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traceback if available.
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"""
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exc_info = None
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with self.isolation(input=input, env=env, color=color) as outstreams:
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return_value = None
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exception: t.Optional[BaseException] = None
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exit_code = 0
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if isinstance(args, str):
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args = shlex.split(args)
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try:
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prog_name = extra.pop("prog_name")
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except KeyError:
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prog_name = self.get_default_prog_name(cli)
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try:
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return_value = cli.main(args=args or (), prog_name=prog_name, **extra)
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except SystemExit as e:
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exc_info = sys.exc_info()
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e_code = t.cast(t.Optional[t.Union[int, t.Any]], e.code)
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if e_code is None:
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e_code = 0
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if e_code != 0:
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exception = e
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if not isinstance(e_code, int):
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sys.stdout.write(str(e_code))
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sys.stdout.write("\n")
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e_code = 1
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exit_code = e_code
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except Exception as e:
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if not catch_exceptions:
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raise
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exception = e
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exit_code = 1
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exc_info = sys.exc_info()
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finally:
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sys.stdout.flush()
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stdout = outstreams[0].getvalue()
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if self.mix_stderr:
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stderr = None
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else:
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stderr = outstreams[1].getvalue() # type: ignore
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return Result(
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runner=self,
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stdout_bytes=stdout,
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stderr_bytes=stderr,
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return_value=return_value,
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exit_code=exit_code,
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exception=exception,
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exc_info=exc_info, # type: ignore
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)
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@contextlib.contextmanager
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def isolated_filesystem(
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self, temp_dir: t.Optional[t.Union[str, os.PathLike]] = None
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) -> t.Iterator[str]:
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"""A context manager that creates a temporary directory and
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changes the current working directory to it. This isolates tests
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that affect the contents of the CWD to prevent them from
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interfering with each other.
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:param temp_dir: Create the temporary directory under this
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directory. If given, the created directory is not removed
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when exiting.
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.. versionchanged:: 8.0
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Added the ``temp_dir`` parameter.
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"""
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cwd = os.getcwd()
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t = tempfile.mkdtemp(dir=temp_dir)
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os.chdir(t)
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try:
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yield t
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finally:
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os.chdir(cwd)
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if temp_dir is None:
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try:
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shutil.rmtree(t)
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except OSError: # noqa: B014
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pass
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