CS2613/utils/python-venv/Lib/site-packages/coverage/debug.py
Isaac Shoebottom a50f49d2c8 Add python venv
2022-10-31 10:10:52 -03:00

422 lines
14 KiB
Python

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