391 lines
13 KiB
Python
391 lines
13 KiB
Python
"""Interactive debugging with PDB, the Python Debugger."""
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import argparse
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import functools
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import sys
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import types
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import unittest
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from typing import Any
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from typing import Callable
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from typing import Generator
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from typing import List
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from typing import Optional
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from typing import Tuple
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from typing import Type
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from typing import TYPE_CHECKING
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from typing import Union
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from _pytest import outcomes
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from _pytest._code import ExceptionInfo
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from _pytest.config import Config
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from _pytest.config import ConftestImportFailure
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from _pytest.config import hookimpl
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from _pytest.config import PytestPluginManager
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from _pytest.config.argparsing import Parser
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from _pytest.config.exceptions import UsageError
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from _pytest.nodes import Node
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from _pytest.reports import BaseReport
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if TYPE_CHECKING:
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from _pytest.capture import CaptureManager
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from _pytest.runner import CallInfo
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def _validate_usepdb_cls(value: str) -> Tuple[str, str]:
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"""Validate syntax of --pdbcls option."""
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try:
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modname, classname = value.split(":")
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except ValueError as e:
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raise argparse.ArgumentTypeError(
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f"{value!r} is not in the format 'modname:classname'"
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) from e
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return (modname, classname)
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def pytest_addoption(parser: Parser) -> None:
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group = parser.getgroup("general")
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group._addoption(
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"--pdb",
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dest="usepdb",
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action="store_true",
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help="Start the interactive Python debugger on errors or KeyboardInterrupt",
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)
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group._addoption(
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"--pdbcls",
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dest="usepdb_cls",
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metavar="modulename:classname",
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type=_validate_usepdb_cls,
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help="Specify a custom interactive Python debugger for use with --pdb."
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"For example: --pdbcls=IPython.terminal.debugger:TerminalPdb",
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)
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group._addoption(
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"--trace",
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dest="trace",
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action="store_true",
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help="Immediately break when running each test",
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)
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def pytest_configure(config: Config) -> None:
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import pdb
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if config.getvalue("trace"):
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config.pluginmanager.register(PdbTrace(), "pdbtrace")
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if config.getvalue("usepdb"):
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config.pluginmanager.register(PdbInvoke(), "pdbinvoke")
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pytestPDB._saved.append(
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(pdb.set_trace, pytestPDB._pluginmanager, pytestPDB._config)
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)
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pdb.set_trace = pytestPDB.set_trace
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pytestPDB._pluginmanager = config.pluginmanager
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pytestPDB._config = config
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# NOTE: not using pytest_unconfigure, since it might get called although
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# pytest_configure was not (if another plugin raises UsageError).
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def fin() -> None:
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(
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pdb.set_trace,
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pytestPDB._pluginmanager,
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pytestPDB._config,
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) = pytestPDB._saved.pop()
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config.add_cleanup(fin)
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class pytestPDB:
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"""Pseudo PDB that defers to the real pdb."""
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_pluginmanager: Optional[PytestPluginManager] = None
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_config: Optional[Config] = None
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_saved: List[
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Tuple[Callable[..., None], Optional[PytestPluginManager], Optional[Config]]
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] = []
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_recursive_debug = 0
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_wrapped_pdb_cls: Optional[Tuple[Type[Any], Type[Any]]] = None
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@classmethod
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def _is_capturing(cls, capman: Optional["CaptureManager"]) -> Union[str, bool]:
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if capman:
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return capman.is_capturing()
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return False
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@classmethod
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def _import_pdb_cls(cls, capman: Optional["CaptureManager"]):
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if not cls._config:
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import pdb
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# Happens when using pytest.set_trace outside of a test.
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return pdb.Pdb
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usepdb_cls = cls._config.getvalue("usepdb_cls")
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if cls._wrapped_pdb_cls and cls._wrapped_pdb_cls[0] == usepdb_cls:
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return cls._wrapped_pdb_cls[1]
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if usepdb_cls:
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modname, classname = usepdb_cls
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try:
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__import__(modname)
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mod = sys.modules[modname]
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# Handle --pdbcls=pdb:pdb.Pdb (useful e.g. with pdbpp).
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parts = classname.split(".")
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pdb_cls = getattr(mod, parts[0])
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for part in parts[1:]:
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pdb_cls = getattr(pdb_cls, part)
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except Exception as exc:
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value = ":".join((modname, classname))
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raise UsageError(
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f"--pdbcls: could not import {value!r}: {exc}"
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) from exc
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else:
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import pdb
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pdb_cls = pdb.Pdb
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wrapped_cls = cls._get_pdb_wrapper_class(pdb_cls, capman)
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cls._wrapped_pdb_cls = (usepdb_cls, wrapped_cls)
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return wrapped_cls
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@classmethod
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def _get_pdb_wrapper_class(cls, pdb_cls, capman: Optional["CaptureManager"]):
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import _pytest.config
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# Type ignored because mypy doesn't support "dynamic"
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# inheritance like this.
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class PytestPdbWrapper(pdb_cls): # type: ignore[valid-type,misc]
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_pytest_capman = capman
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_continued = False
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def do_debug(self, arg):
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cls._recursive_debug += 1
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ret = super().do_debug(arg)
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cls._recursive_debug -= 1
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return ret
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def do_continue(self, arg):
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ret = super().do_continue(arg)
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if cls._recursive_debug == 0:
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assert cls._config is not None
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tw = _pytest.config.create_terminal_writer(cls._config)
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tw.line()
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capman = self._pytest_capman
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capturing = pytestPDB._is_capturing(capman)
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if capturing:
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if capturing == "global":
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tw.sep(">", "PDB continue (IO-capturing resumed)")
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else:
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tw.sep(
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">",
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"PDB continue (IO-capturing resumed for %s)"
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% capturing,
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)
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assert capman is not None
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capman.resume()
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else:
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tw.sep(">", "PDB continue")
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assert cls._pluginmanager is not None
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cls._pluginmanager.hook.pytest_leave_pdb(config=cls._config, pdb=self)
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self._continued = True
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return ret
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do_c = do_cont = do_continue
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def do_quit(self, arg):
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"""Raise Exit outcome when quit command is used in pdb.
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This is a bit of a hack - it would be better if BdbQuit
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could be handled, but this would require to wrap the
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whole pytest run, and adjust the report etc.
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"""
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ret = super().do_quit(arg)
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if cls._recursive_debug == 0:
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outcomes.exit("Quitting debugger")
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return ret
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do_q = do_quit
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do_exit = do_quit
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def setup(self, f, tb):
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"""Suspend on setup().
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Needed after do_continue resumed, and entering another
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breakpoint again.
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"""
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ret = super().setup(f, tb)
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if not ret and self._continued:
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# pdb.setup() returns True if the command wants to exit
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# from the interaction: do not suspend capturing then.
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if self._pytest_capman:
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self._pytest_capman.suspend_global_capture(in_=True)
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return ret
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def get_stack(self, f, t):
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stack, i = super().get_stack(f, t)
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if f is None:
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# Find last non-hidden frame.
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i = max(0, len(stack) - 1)
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while i and stack[i][0].f_locals.get("__tracebackhide__", False):
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i -= 1
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return stack, i
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return PytestPdbWrapper
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@classmethod
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def _init_pdb(cls, method, *args, **kwargs):
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"""Initialize PDB debugging, dropping any IO capturing."""
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import _pytest.config
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if cls._pluginmanager is None:
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capman: Optional[CaptureManager] = None
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else:
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capman = cls._pluginmanager.getplugin("capturemanager")
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if capman:
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capman.suspend(in_=True)
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if cls._config:
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tw = _pytest.config.create_terminal_writer(cls._config)
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tw.line()
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if cls._recursive_debug == 0:
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# Handle header similar to pdb.set_trace in py37+.
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header = kwargs.pop("header", None)
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if header is not None:
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tw.sep(">", header)
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else:
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capturing = cls._is_capturing(capman)
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if capturing == "global":
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tw.sep(">", f"PDB {method} (IO-capturing turned off)")
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elif capturing:
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tw.sep(
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">",
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"PDB %s (IO-capturing turned off for %s)"
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% (method, capturing),
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)
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else:
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tw.sep(">", f"PDB {method}")
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_pdb = cls._import_pdb_cls(capman)(**kwargs)
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if cls._pluginmanager:
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cls._pluginmanager.hook.pytest_enter_pdb(config=cls._config, pdb=_pdb)
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return _pdb
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@classmethod
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def set_trace(cls, *args, **kwargs) -> None:
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"""Invoke debugging via ``Pdb.set_trace``, dropping any IO capturing."""
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frame = sys._getframe().f_back
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_pdb = cls._init_pdb("set_trace", *args, **kwargs)
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_pdb.set_trace(frame)
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class PdbInvoke:
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def pytest_exception_interact(
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self, node: Node, call: "CallInfo[Any]", report: BaseReport
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) -> None:
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capman = node.config.pluginmanager.getplugin("capturemanager")
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if capman:
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capman.suspend_global_capture(in_=True)
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out, err = capman.read_global_capture()
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sys.stdout.write(out)
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sys.stdout.write(err)
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assert call.excinfo is not None
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if not isinstance(call.excinfo.value, unittest.SkipTest):
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_enter_pdb(node, call.excinfo, report)
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def pytest_internalerror(self, excinfo: ExceptionInfo[BaseException]) -> None:
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tb = _postmortem_traceback(excinfo)
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post_mortem(tb)
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class PdbTrace:
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@hookimpl(hookwrapper=True)
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def pytest_pyfunc_call(self, pyfuncitem) -> Generator[None, None, None]:
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wrap_pytest_function_for_tracing(pyfuncitem)
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yield
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def wrap_pytest_function_for_tracing(pyfuncitem):
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"""Change the Python function object of the given Function item by a
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wrapper which actually enters pdb before calling the python function
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itself, effectively leaving the user in the pdb prompt in the first
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statement of the function."""
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_pdb = pytestPDB._init_pdb("runcall")
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testfunction = pyfuncitem.obj
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# we can't just return `partial(pdb.runcall, testfunction)` because (on
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# python < 3.7.4) runcall's first param is `func`, which means we'd get
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# an exception if one of the kwargs to testfunction was called `func`.
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@functools.wraps(testfunction)
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def wrapper(*args, **kwargs):
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func = functools.partial(testfunction, *args, **kwargs)
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_pdb.runcall(func)
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pyfuncitem.obj = wrapper
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def maybe_wrap_pytest_function_for_tracing(pyfuncitem):
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"""Wrap the given pytestfunct item for tracing support if --trace was given in
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the command line."""
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if pyfuncitem.config.getvalue("trace"):
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wrap_pytest_function_for_tracing(pyfuncitem)
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def _enter_pdb(
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node: Node, excinfo: ExceptionInfo[BaseException], rep: BaseReport
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) -> BaseReport:
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# XXX we re-use the TerminalReporter's terminalwriter
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# because this seems to avoid some encoding related troubles
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# for not completely clear reasons.
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tw = node.config.pluginmanager.getplugin("terminalreporter")._tw
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tw.line()
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showcapture = node.config.option.showcapture
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for sectionname, content in (
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("stdout", rep.capstdout),
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("stderr", rep.capstderr),
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("log", rep.caplog),
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):
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if showcapture in (sectionname, "all") and content:
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tw.sep(">", "captured " + sectionname)
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if content[-1:] == "\n":
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content = content[:-1]
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tw.line(content)
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tw.sep(">", "traceback")
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rep.toterminal(tw)
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tw.sep(">", "entering PDB")
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tb = _postmortem_traceback(excinfo)
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rep._pdbshown = True # type: ignore[attr-defined]
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post_mortem(tb)
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return rep
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def _postmortem_traceback(excinfo: ExceptionInfo[BaseException]) -> types.TracebackType:
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from doctest import UnexpectedException
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if isinstance(excinfo.value, UnexpectedException):
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# A doctest.UnexpectedException is not useful for post_mortem.
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# Use the underlying exception instead:
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return excinfo.value.exc_info[2]
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elif isinstance(excinfo.value, ConftestImportFailure):
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# A config.ConftestImportFailure is not useful for post_mortem.
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# Use the underlying exception instead:
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return excinfo.value.excinfo[2]
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else:
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assert excinfo._excinfo is not None
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return excinfo._excinfo[2]
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def post_mortem(t: types.TracebackType) -> None:
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p = pytestPDB._init_pdb("post_mortem")
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p.reset()
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p.interaction(None, t)
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if p.quitting:
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outcomes.exit("Quitting debugger")
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