forked from anton/matekasse
524 lines
17 KiB
Python
524 lines
17 KiB
Python
# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
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# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
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"""Control of and utilities for debugging."""
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from __future__ import annotations
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import contextlib
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import functools
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import inspect
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import io
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import itertools
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import os
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import pprint
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import re
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import reprlib
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import sys
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import types
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import _thread
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from typing import (
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cast,
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Any, Callable, IO, Iterable, Iterator, Mapping, Optional, List, Tuple,
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)
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from coverage.misc import human_sorted_items, isolate_module
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from coverage.types import TWritable
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os = isolate_module(os)
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# When debugging, it can be helpful to force some options, especially when
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# debugging the configuration mechanisms you usually use to control debugging!
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# This is a list of forced debugging options.
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FORCED_DEBUG: List[str] = []
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FORCED_DEBUG_FILE = None
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class DebugControl:
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"""Control and output for debugging."""
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show_repr_attr = False # For AutoReprMixin
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def __init__(
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self,
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options: Iterable[str],
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output: Optional[IO[str]],
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file_name: Optional[str] = None,
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) -> None:
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"""Configure the options and output file for debugging."""
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self.options = list(options) + FORCED_DEBUG
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self.suppress_callers = False
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filters = []
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if self.should("pid"):
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filters.append(add_pid_and_tid)
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self.output = DebugOutputFile.get_one(
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output,
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file_name=file_name,
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show_process=self.should("process"),
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filters=filters,
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)
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self.raw_output = self.output.outfile
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def __repr__(self) -> str:
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return f"<DebugControl options={self.options!r} raw_output={self.raw_output!r}>"
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def should(self, option: str) -> bool:
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"""Decide whether to output debug information in category `option`."""
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if option == "callers" and self.suppress_callers:
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return False
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return (option in self.options)
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@contextlib.contextmanager
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def without_callers(self) -> Iterator[None]:
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"""A context manager to prevent call stacks from being logged."""
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old = self.suppress_callers
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self.suppress_callers = True
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try:
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yield
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finally:
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self.suppress_callers = old
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def write(self, msg: str) -> None:
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"""Write a line of debug output.
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`msg` is the line to write. A newline will be appended.
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"""
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self.output.write(msg+"\n")
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if self.should("self"):
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caller_self = inspect.stack()[1][0].f_locals.get("self")
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if caller_self is not None:
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self.output.write(f"self: {caller_self!r}\n")
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if self.should("callers"):
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dump_stack_frames(out=self.output, skip=1)
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self.output.flush()
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class DebugControlString(DebugControl):
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"""A `DebugControl` that writes to a StringIO, for testing."""
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def __init__(self, options: Iterable[str]) -> None:
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super().__init__(options, io.StringIO())
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def get_output(self) -> str:
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"""Get the output text from the `DebugControl`."""
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return cast(str, self.raw_output.getvalue()) # type: ignore
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class NoDebugging(DebugControl):
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"""A replacement for DebugControl that will never try to do anything."""
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def __init__(self) -> None:
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# pylint: disable=super-init-not-called
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...
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def should(self, option: str) -> bool:
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"""Should we write debug messages? Never."""
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return False
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def write(self, msg: str) -> None:
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"""This will never be called."""
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raise AssertionError("NoDebugging.write should never be called.")
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def info_header(label: str) -> str:
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"""Make a nice header string."""
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return "--{:-<60s}".format(" "+label+" ")
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def info_formatter(info: Iterable[Tuple[str, Any]]) -> Iterator[str]:
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"""Produce a sequence of formatted lines from info.
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`info` is a sequence of pairs (label, data). The produced lines are
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nicely formatted, ready to print.
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"""
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info = list(info)
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if not info:
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return
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label_len = 30
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assert all(len(l) < label_len for l, _ in info)
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for label, data in info:
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if data == []:
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data = "-none-"
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if isinstance(data, tuple) and len(repr(tuple(data))) < 30:
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# Convert to tuple to scrub namedtuples.
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yield "%*s: %r" % (label_len, label, tuple(data))
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elif isinstance(data, (list, set, tuple)):
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prefix = "%*s:" % (label_len, label)
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for e in data:
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yield "%*s %s" % (label_len+1, prefix, e)
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prefix = ""
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else:
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yield "%*s: %s" % (label_len, label, data)
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def write_formatted_info(
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write: Callable[[str], None],
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header: str,
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info: Iterable[Tuple[str, Any]],
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) -> None:
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"""Write a sequence of (label,data) pairs nicely.
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`write` is a function write(str) that accepts each line of output.
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`header` is a string to start the section. `info` is a sequence of
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(label, data) pairs, where label is a str, and data can be a single
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value, or a list/set/tuple.
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"""
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write(info_header(header))
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for line in info_formatter(info):
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write(f" {line}")
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def short_stack(limit: Optional[int] = None, skip: int = 0) -> str:
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"""Return a string summarizing the call stack.
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The string is multi-line, with one line per stack frame. Each line shows
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the function name, the file name, and the line number:
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...
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start_import_stop : /Users/ned/coverage/trunk/tests/coveragetest.py @95
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import_local_file : /Users/ned/coverage/trunk/tests/coveragetest.py @81
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import_local_file : /Users/ned/coverage/trunk/coverage/backward.py @159
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...
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`limit` is the number of frames to include, defaulting to all of them.
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`skip` is the number of frames to skip, so that debugging functions can
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call this and not be included in the result.
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"""
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stack = inspect.stack()[limit:skip:-1]
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return "\n".join("%30s : %s:%d" % (t[3], t[1], t[2]) for t in stack)
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def dump_stack_frames(
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limit: Optional[int] = None,
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out: Optional[TWritable] = None,
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skip: int = 0
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) -> None:
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"""Print a summary of the stack to stdout, or someplace else."""
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fout = out or sys.stdout
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fout.write(short_stack(limit=limit, skip=skip+1))
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fout.write("\n")
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def clipped_repr(text: str, numchars: int = 50) -> str:
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"""`repr(text)`, but limited to `numchars`."""
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r = reprlib.Repr()
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r.maxstring = numchars
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return r.repr(text)
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def short_id(id64: int) -> int:
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"""Given a 64-bit id, make a shorter 16-bit one."""
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id16 = 0
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for offset in range(0, 64, 16):
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id16 ^= id64 >> offset
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return id16 & 0xFFFF
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def add_pid_and_tid(text: str) -> str:
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"""A filter to add pid and tid to debug messages."""
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# Thread ids are useful, but too long. Make a shorter one.
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tid = f"{short_id(_thread.get_ident()):04x}"
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text = f"{os.getpid():5d}.{tid}: {text}"
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return text
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class AutoReprMixin:
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"""A mixin implementing an automatic __repr__ for debugging."""
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auto_repr_ignore = ["auto_repr_ignore", "$coverage.object_id"]
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def __repr__(self) -> str:
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show_attrs = (
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(k, v) for k, v in self.__dict__.items()
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if getattr(v, "show_repr_attr", True)
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and not callable(v)
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and k not in self.auto_repr_ignore
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)
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return "<{klass} @0x{id:x} {attrs}>".format(
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klass=self.__class__.__name__,
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id=id(self),
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attrs=" ".join(f"{k}={v!r}" for k, v in show_attrs),
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)
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def simplify(v: Any) -> Any: # pragma: debugging
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"""Turn things which are nearly dict/list/etc into dict/list/etc."""
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if isinstance(v, dict):
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return {k:simplify(vv) for k, vv in v.items()}
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elif isinstance(v, (list, tuple)):
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return type(v)(simplify(vv) for vv in v)
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elif hasattr(v, "__dict__"):
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return simplify({"."+k: v for k, v in v.__dict__.items()})
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else:
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return v
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def pp(v: Any) -> None: # pragma: debugging
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"""Debug helper to pretty-print data, including SimpleNamespace objects."""
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# Might not be needed in 3.9+
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pprint.pprint(simplify(v))
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def filter_text(text: str, filters: Iterable[Callable[[str], str]]) -> str:
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"""Run `text` through a series of filters.
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`filters` is a list of functions. Each takes a string and returns a
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string. Each is run in turn.
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Returns: the final string that results after all of the filters have
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run.
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"""
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clean_text = text.rstrip()
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ending = text[len(clean_text):]
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text = clean_text
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for fn in filters:
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lines = []
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for line in text.splitlines():
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lines.extend(fn(line).splitlines())
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text = "\n".join(lines)
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return text + ending
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class CwdTracker:
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"""A class to add cwd info to debug messages."""
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def __init__(self) -> None:
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self.cwd: Optional[str] = None
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def filter(self, text: str) -> str:
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"""Add a cwd message for each new cwd."""
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cwd = os.getcwd()
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if cwd != self.cwd:
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text = f"cwd is now {cwd!r}\n" + text
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self.cwd = cwd
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return text
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class DebugOutputFile:
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"""A file-like object that includes pid and cwd information."""
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def __init__(
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self,
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outfile: Optional[IO[str]],
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show_process: bool,
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filters: Iterable[Callable[[str], str]],
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):
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self.outfile = outfile
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self.show_process = show_process
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self.filters = list(filters)
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if self.show_process:
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self.filters.insert(0, CwdTracker().filter)
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self.write(f"New process: executable: {sys.executable!r}\n")
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self.write("New process: cmd: {!r}\n".format(getattr(sys, "argv", None)))
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if hasattr(os, "getppid"):
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self.write(f"New process: pid: {os.getpid()!r}, parent pid: {os.getppid()!r}\n")
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@classmethod
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def get_one(
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cls,
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fileobj: Optional[IO[str]] = None,
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file_name: Optional[str] = None,
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show_process: bool = True,
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filters: Iterable[Callable[[str], str]] = (),
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interim: bool = False,
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) -> DebugOutputFile:
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"""Get a DebugOutputFile.
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If `fileobj` is provided, then a new DebugOutputFile is made with it.
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If `fileobj` isn't provided, then a file is chosen (`file_name` if
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provided, or COVERAGE_DEBUG_FILE, or stderr), and a process-wide
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singleton DebugOutputFile is made.
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`show_process` controls whether the debug file adds process-level
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information, and filters is a list of other message filters to apply.
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`filters` are the text filters to apply to the stream to annotate with
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pids, etc.
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If `interim` is true, then a future `get_one` can replace this one.
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"""
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if fileobj is not None:
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# Make DebugOutputFile around the fileobj passed.
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return cls(fileobj, show_process, filters)
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the_one, is_interim = cls._get_singleton_data()
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if the_one is None or is_interim:
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if file_name is not None:
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fileobj = open(file_name, "a", encoding="utf-8")
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else:
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file_name = os.environ.get("COVERAGE_DEBUG_FILE", FORCED_DEBUG_FILE)
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if file_name in ("stdout", "stderr"):
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fileobj = getattr(sys, file_name)
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elif file_name:
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fileobj = open(file_name, "a", encoding="utf-8")
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else:
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fileobj = sys.stderr
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the_one = cls(fileobj, show_process, filters)
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cls._set_singleton_data(the_one, interim)
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return the_one
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# Because of the way igor.py deletes and re-imports modules,
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# this class can be defined more than once. But we really want
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# a process-wide singleton. So stash it in sys.modules instead of
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# on a class attribute. Yes, this is aggressively gross.
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SYS_MOD_NAME = "$coverage.debug.DebugOutputFile.the_one"
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SINGLETON_ATTR = "the_one_and_is_interim"
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@classmethod
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def _set_singleton_data(cls, the_one: DebugOutputFile, interim: bool) -> None:
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"""Set the one DebugOutputFile to rule them all."""
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singleton_module = types.ModuleType(cls.SYS_MOD_NAME)
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setattr(singleton_module, cls.SINGLETON_ATTR, (the_one, interim))
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sys.modules[cls.SYS_MOD_NAME] = singleton_module
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@classmethod
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def _get_singleton_data(cls) -> Tuple[Optional[DebugOutputFile], bool]:
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"""Get the one DebugOutputFile."""
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singleton_module = sys.modules.get(cls.SYS_MOD_NAME)
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return getattr(singleton_module, cls.SINGLETON_ATTR, (None, True))
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@classmethod
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def _del_singleton_data(cls) -> None:
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"""Delete the one DebugOutputFile, just for tests to use."""
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if cls.SYS_MOD_NAME in sys.modules:
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del sys.modules[cls.SYS_MOD_NAME]
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def write(self, text: str) -> None:
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"""Just like file.write, but filter through all our filters."""
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assert self.outfile is not None
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self.outfile.write(filter_text(text, self.filters))
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self.outfile.flush()
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def flush(self) -> None:
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"""Flush our file."""
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assert self.outfile is not None
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self.outfile.flush()
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def log(msg: str, stack: bool = False) -> None: # pragma: debugging
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"""Write a log message as forcefully as possible."""
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out = DebugOutputFile.get_one(interim=True)
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out.write(msg+"\n")
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if stack:
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dump_stack_frames(out=out, skip=1)
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def decorate_methods(
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decorator: Callable[..., Any],
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butnot: Iterable[str] = (),
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private: bool = False,
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) -> Callable[..., Any]: # pragma: debugging
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"""A class decorator to apply a decorator to methods."""
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def _decorator(cls): # type: ignore
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for name, meth in inspect.getmembers(cls, inspect.isroutine):
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if name not in cls.__dict__:
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continue
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if name != "__init__":
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if not private and name.startswith("_"):
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continue
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if name in butnot:
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continue
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setattr(cls, name, decorator(meth))
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return cls
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return _decorator
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def break_in_pudb(func: Callable[..., Any]) -> Callable[..., Any]: # pragma: debugging
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"""A function decorator to stop in the debugger for each call."""
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@functools.wraps(func)
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def _wrapper(*args: Any, **kwargs: Any) -> Any:
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import pudb
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sys.stdout = sys.__stdout__
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pudb.set_trace()
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return func(*args, **kwargs)
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return _wrapper
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OBJ_IDS = itertools.count()
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CALLS = itertools.count()
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OBJ_ID_ATTR = "$coverage.object_id"
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def show_calls(
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show_args: bool = True,
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show_stack: bool = False,
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show_return: bool = False,
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) -> Callable[..., Any]: # pragma: debugging
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"""A method decorator to debug-log each call to the function."""
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def _decorator(func: Callable[..., Any]) -> Callable[..., Any]:
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@functools.wraps(func)
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def _wrapper(self: Any, *args: Any, **kwargs: Any) -> Any:
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oid = getattr(self, OBJ_ID_ATTR, None)
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if oid is None:
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oid = f"{os.getpid():08d} {next(OBJ_IDS):04d}"
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setattr(self, OBJ_ID_ATTR, oid)
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extra = ""
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if show_args:
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eargs = ", ".join(map(repr, args))
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ekwargs = ", ".join("{}={!r}".format(*item) for item in kwargs.items())
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extra += "("
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extra += eargs
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if eargs and ekwargs:
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extra += ", "
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extra += ekwargs
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extra += ")"
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if show_stack:
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extra += " @ "
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extra += "; ".join(_clean_stack_line(l) for l in short_stack().splitlines())
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callid = next(CALLS)
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msg = f"{oid} {callid:04d} {func.__name__}{extra}\n"
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DebugOutputFile.get_one(interim=True).write(msg)
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ret = func(self, *args, **kwargs)
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if show_return:
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msg = f"{oid} {callid:04d} {func.__name__} return {ret!r}\n"
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DebugOutputFile.get_one(interim=True).write(msg)
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return ret
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return _wrapper
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return _decorator
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def _clean_stack_line(s: str) -> str: # pragma: debugging
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"""Simplify some paths in a stack trace, for compactness."""
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s = s.strip()
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s = s.replace(os.path.dirname(__file__) + "/", "")
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s = s.replace(os.path.dirname(os.__file__) + "/", "")
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s = s.replace(sys.prefix + "/", "")
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return s
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def relevant_environment_display(env: Mapping[str, str]) -> List[Tuple[str, str]]:
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"""Filter environment variables for a debug display.
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Select variables to display (with COV or PY in the name, or HOME, TEMP, or
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TMP), and also cloak sensitive values with asterisks.
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Arguments:
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env: a dict of environment variable names and values.
|
|
|
|
Returns:
|
|
A list of pairs (name, value) to show.
|
|
|
|
"""
|
|
slugs = {"COV", "PY"}
|
|
include = {"HOME", "TEMP", "TMP"}
|
|
cloak = {"API", "TOKEN", "KEY", "SECRET", "PASS", "SIGNATURE"}
|
|
|
|
to_show = []
|
|
for name, val in env.items():
|
|
keep = False
|
|
if name in include:
|
|
keep = True
|
|
elif any(slug in name for slug in slugs):
|
|
keep = True
|
|
if keep:
|
|
if any(slug in name for slug in cloak):
|
|
val = re.sub(r"\w", "*", val)
|
|
to_show.append((name, val))
|
|
return human_sorted_items(to_show)
|