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Python

import contextlib
import errno
import logging
import logging.handlers
import os
import sys
from logging import Filter, getLogger
from typing import IO, Any, Callable, Iterator, Optional, TextIO, Type, cast
from pip._internal.utils.compat import WINDOWS
from pip._internal.utils.deprecation import DEPRECATION_MSG_PREFIX
from pip._internal.utils.misc import ensure_dir
try:
import threading
except ImportError:
import dummy_threading as threading # type: ignore
try:
from pip._vendor import colorama
# Lots of different errors can come from this, including SystemError and
# ImportError.
except Exception:
colorama = None
_log_state = threading.local()
subprocess_logger = getLogger("pip.subprocessor")
class BrokenStdoutLoggingError(Exception):
"""
Raised if BrokenPipeError occurs for the stdout stream while logging.
"""
pass
# BrokenPipeError manifests differently in Windows and non-Windows.
if WINDOWS:
# In Windows, a broken pipe can show up as EINVAL rather than EPIPE:
# https://bugs.python.org/issue19612
# https://bugs.python.org/issue30418
def _is_broken_pipe_error(exc_class, exc):
# type: (Type[BaseException], BaseException) -> bool
"""See the docstring for non-Windows below."""
return (exc_class is BrokenPipeError) or (
isinstance(exc, OSError) and exc.errno in (errno.EINVAL, errno.EPIPE)
)
else:
# Then we are in the non-Windows case.
def _is_broken_pipe_error(exc_class, exc):
# type: (Type[BaseException], BaseException) -> bool
"""
Return whether an exception is a broken pipe error.
Args:
exc_class: an exception class.
exc: an exception instance.
"""
return exc_class is BrokenPipeError
@contextlib.contextmanager
def indent_log(num=2):
# type: (int) -> Iterator[None]
"""
A context manager which will cause the log output to be indented for any
log messages emitted inside it.
"""
# For thread-safety
_log_state.indentation = get_indentation()
_log_state.indentation += num
try:
yield
finally:
_log_state.indentation -= num
def get_indentation():
# type: () -> int
return getattr(_log_state, "indentation", 0)
class IndentingFormatter(logging.Formatter):
default_time_format = "%Y-%m-%dT%H:%M:%S"
def __init__(
self,
*args, # type: Any
add_timestamp=False, # type: bool
**kwargs, # type: Any
):
# type: (...) -> None
"""
A logging.Formatter that obeys the indent_log() context manager.
:param add_timestamp: A bool indicating output lines should be prefixed
with their record's timestamp.
"""
self.add_timestamp = add_timestamp
super().__init__(*args, **kwargs)
def get_message_start(self, formatted, levelno):
# type: (str, int) -> str
"""
Return the start of the formatted log message (not counting the
prefix to add to each line).
"""
if levelno < logging.WARNING:
return ""
if formatted.startswith(DEPRECATION_MSG_PREFIX):
# Then the message already has a prefix. We don't want it to
# look like "WARNING: DEPRECATION: ...."
return ""
if levelno < logging.ERROR:
return "WARNING: "
return "ERROR: "
def format(self, record):
# type: (logging.LogRecord) -> str
"""
Calls the standard formatter, but will indent all of the log message
lines by our current indentation level.
"""
formatted = super().format(record)
message_start = self.get_message_start(formatted, record.levelno)
formatted = message_start + formatted
prefix = ""
if self.add_timestamp:
prefix = f"{self.formatTime(record)} "
prefix += " " * get_indentation()
formatted = "".join([prefix + line for line in formatted.splitlines(True)])
return formatted
def _color_wrap(*colors):
# type: (*str) -> Callable[[str], str]
def wrapped(inp):
# type: (str) -> str
return "".join(list(colors) + [inp, colorama.Style.RESET_ALL])
return wrapped
class ColorizedStreamHandler(logging.StreamHandler):
# Don't build up a list of colors if we don't have colorama
if colorama:
COLORS = [
# This needs to be in order from highest logging level to lowest.
(logging.ERROR, _color_wrap(colorama.Fore.RED)),
(logging.WARNING, _color_wrap(colorama.Fore.YELLOW)),
]
else:
COLORS = []
def __init__(self, stream=None, no_color=None):
# type: (Optional[TextIO], bool) -> None
super().__init__(stream)
self._no_color = no_color
if WINDOWS and colorama:
self.stream = colorama.AnsiToWin32(self.stream)
def _using_stdout(self):
# type: () -> bool
"""
Return whether the handler is using sys.stdout.
"""
if WINDOWS and colorama:
# Then self.stream is an AnsiToWin32 object.
stream = cast(colorama.AnsiToWin32, self.stream)
return stream.wrapped is sys.stdout
return self.stream is sys.stdout
def should_color(self):
# type: () -> bool
# Don't colorize things if we do not have colorama or if told not to
if not colorama or self._no_color:
return False
real_stream = (
self.stream
if not isinstance(self.stream, colorama.AnsiToWin32)
else self.stream.wrapped
)
# If the stream is a tty we should color it
if hasattr(real_stream, "isatty") and real_stream.isatty():
return True
# If we have an ANSI term we should color it
if os.environ.get("TERM") == "ANSI":
return True
# If anything else we should not color it
return False
def format(self, record):
# type: (logging.LogRecord) -> str
msg = super().format(record)
if self.should_color():
for level, color in self.COLORS:
if record.levelno >= level:
msg = color(msg)
break
return msg
# The logging module says handleError() can be customized.
def handleError(self, record):
# type: (logging.LogRecord) -> None
exc_class, exc = sys.exc_info()[:2]
# If a broken pipe occurred while calling write() or flush() on the
# stdout stream in logging's Handler.emit(), then raise our special
# exception so we can handle it in main() instead of logging the
# broken pipe error and continuing.
if (
exc_class
and exc
and self._using_stdout()
and _is_broken_pipe_error(exc_class, exc)
):
raise BrokenStdoutLoggingError()
return super().handleError(record)
class BetterRotatingFileHandler(logging.handlers.RotatingFileHandler):
def _open(self):
# type: () -> IO[Any]
ensure_dir(os.path.dirname(self.baseFilename))
return super()._open()
class MaxLevelFilter(Filter):
def __init__(self, level):
# type: (int) -> None
self.level = level
def filter(self, record):
# type: (logging.LogRecord) -> bool
return record.levelno < self.level
class ExcludeLoggerFilter(Filter):
"""
A logging Filter that excludes records from a logger (or its children).
"""
def filter(self, record):
# type: (logging.LogRecord) -> bool
# The base Filter class allows only records from a logger (or its
# children).
return not super().filter(record)
def setup_logging(verbosity, no_color, user_log_file):
# type: (int, bool, Optional[str]) -> int
"""Configures and sets up all of the logging
Returns the requested logging level, as its integer value.
"""
# Determine the level to be logging at.
if verbosity >= 1:
level = "DEBUG"
elif verbosity == -1:
level = "WARNING"
elif verbosity == -2:
level = "ERROR"
elif verbosity <= -3:
level = "CRITICAL"
else:
level = "INFO"
level_number = getattr(logging, level)
# The "root" logger should match the "console" level *unless* we also need
# to log to a user log file.
include_user_log = user_log_file is not None
if include_user_log:
additional_log_file = user_log_file
root_level = "DEBUG"
else:
additional_log_file = "/dev/null"
root_level = level
# Disable any logging besides WARNING unless we have DEBUG level logging
# enabled for vendored libraries.
vendored_log_level = "WARNING" if level in ["INFO", "ERROR"] else "DEBUG"
# Shorthands for clarity
log_streams = {
"stdout": "ext://sys.stdout",
"stderr": "ext://sys.stderr",
}
handler_classes = {
"stream": "pip._internal.utils.logging.ColorizedStreamHandler",
"file": "pip._internal.utils.logging.BetterRotatingFileHandler",
}
handlers = ["console", "console_errors", "console_subprocess"] + (
["user_log"] if include_user_log else []
)
logging.config.dictConfig(
{
"version": 1,
"disable_existing_loggers": False,
"filters": {
"exclude_warnings": {
"()": "pip._internal.utils.logging.MaxLevelFilter",
"level": logging.WARNING,
},
"restrict_to_subprocess": {
"()": "logging.Filter",
"name": subprocess_logger.name,
},
"exclude_subprocess": {
"()": "pip._internal.utils.logging.ExcludeLoggerFilter",
"name": subprocess_logger.name,
},
},
"formatters": {
"indent": {
"()": IndentingFormatter,
"format": "%(message)s",
},
"indent_with_timestamp": {
"()": IndentingFormatter,
"format": "%(message)s",
"add_timestamp": True,
},
},
"handlers": {
"console": {
"level": level,
"class": handler_classes["stream"],
"no_color": no_color,
"stream": log_streams["stdout"],
"filters": ["exclude_subprocess", "exclude_warnings"],
"formatter": "indent",
},
"console_errors": {
"level": "WARNING",
"class": handler_classes["stream"],
"no_color": no_color,
"stream": log_streams["stderr"],
"filters": ["exclude_subprocess"],
"formatter": "indent",
},
# A handler responsible for logging to the console messages
# from the "subprocessor" logger.
"console_subprocess": {
"level": level,
"class": handler_classes["stream"],
"no_color": no_color,
"stream": log_streams["stderr"],
"filters": ["restrict_to_subprocess"],
"formatter": "indent",
},
"user_log": {
"level": "DEBUG",
"class": handler_classes["file"],
"filename": additional_log_file,
"delay": True,
"formatter": "indent_with_timestamp",
},
},
"root": {
"level": root_level,
"handlers": handlers,
},
"loggers": {"pip._vendor": {"level": vendored_log_level}},
}
)
return level_number