822 lines
29 KiB
Python
822 lines
29 KiB
Python
"""Access and control log capturing."""
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import logging
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import os
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import re
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import sys
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from contextlib import contextmanager
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from io import StringIO
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from pathlib import Path
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from typing import AbstractSet
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from typing import Dict
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from typing import Generator
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from typing import List
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from typing import Mapping
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from typing import Optional
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from typing import Tuple
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from typing import TypeVar
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from typing import Union
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from _pytest import nodes
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from _pytest._io import TerminalWriter
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from _pytest.capture import CaptureManager
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from _pytest.compat import final
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from _pytest.compat import nullcontext
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from _pytest.config import _strtobool
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from _pytest.config import Config
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from _pytest.config import create_terminal_writer
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from _pytest.config import hookimpl
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from _pytest.config import UsageError
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from _pytest.config.argparsing import Parser
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from _pytest.deprecated import check_ispytest
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from _pytest.fixtures import fixture
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from _pytest.fixtures import FixtureRequest
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from _pytest.main import Session
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from _pytest.store import StoreKey
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from _pytest.terminal import TerminalReporter
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DEFAULT_LOG_FORMAT = "%(levelname)-8s %(name)s:%(filename)s:%(lineno)d %(message)s"
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DEFAULT_LOG_DATE_FORMAT = "%H:%M:%S"
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_ANSI_ESCAPE_SEQ = re.compile(r"\x1b\[[\d;]+m")
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caplog_handler_key = StoreKey["LogCaptureHandler"]()
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caplog_records_key = StoreKey[Dict[str, List[logging.LogRecord]]]()
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def _remove_ansi_escape_sequences(text: str) -> str:
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return _ANSI_ESCAPE_SEQ.sub("", text)
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class ColoredLevelFormatter(logging.Formatter):
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"""A logging formatter which colorizes the %(levelname)..s part of the
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log format passed to __init__."""
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LOGLEVEL_COLOROPTS: Mapping[int, AbstractSet[str]] = {
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logging.CRITICAL: {"red"},
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logging.ERROR: {"red", "bold"},
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logging.WARNING: {"yellow"},
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logging.WARN: {"yellow"},
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logging.INFO: {"green"},
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logging.DEBUG: {"purple"},
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logging.NOTSET: set(),
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}
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LEVELNAME_FMT_REGEX = re.compile(r"%\(levelname\)([+-.]?\d*s)")
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def __init__(self, terminalwriter: TerminalWriter, *args, **kwargs) -> None:
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super().__init__(*args, **kwargs)
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self._original_fmt = self._style._fmt
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self._level_to_fmt_mapping: Dict[int, str] = {}
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assert self._fmt is not None
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levelname_fmt_match = self.LEVELNAME_FMT_REGEX.search(self._fmt)
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if not levelname_fmt_match:
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return
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levelname_fmt = levelname_fmt_match.group()
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for level, color_opts in self.LOGLEVEL_COLOROPTS.items():
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formatted_levelname = levelname_fmt % {
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"levelname": logging.getLevelName(level)
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}
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# add ANSI escape sequences around the formatted levelname
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color_kwargs = {name: True for name in color_opts}
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colorized_formatted_levelname = terminalwriter.markup(
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formatted_levelname, **color_kwargs
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)
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self._level_to_fmt_mapping[level] = self.LEVELNAME_FMT_REGEX.sub(
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colorized_formatted_levelname, self._fmt
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)
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def format(self, record: logging.LogRecord) -> str:
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fmt = self._level_to_fmt_mapping.get(record.levelno, self._original_fmt)
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self._style._fmt = fmt
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return super().format(record)
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class PercentStyleMultiline(logging.PercentStyle):
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"""A logging style with special support for multiline messages.
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If the message of a record consists of multiple lines, this style
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formats the message as if each line were logged separately.
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"""
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def __init__(self, fmt: str, auto_indent: Union[int, str, bool, None]) -> None:
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super().__init__(fmt)
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self._auto_indent = self._get_auto_indent(auto_indent)
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@staticmethod
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def _update_message(
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record_dict: Dict[str, object], message: str
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) -> Dict[str, object]:
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tmp = record_dict.copy()
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tmp["message"] = message
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return tmp
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@staticmethod
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def _get_auto_indent(auto_indent_option: Union[int, str, bool, None]) -> int:
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"""Determine the current auto indentation setting.
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Specify auto indent behavior (on/off/fixed) by passing in
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extra={"auto_indent": [value]} to the call to logging.log() or
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using a --log-auto-indent [value] command line or the
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log_auto_indent [value] config option.
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Default behavior is auto-indent off.
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Using the string "True" or "on" or the boolean True as the value
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turns auto indent on, using the string "False" or "off" or the
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boolean False or the int 0 turns it off, and specifying a
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positive integer fixes the indentation position to the value
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specified.
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Any other values for the option are invalid, and will silently be
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converted to the default.
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:param None|bool|int|str auto_indent_option:
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User specified option for indentation from command line, config
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or extra kwarg. Accepts int, bool or str. str option accepts the
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same range of values as boolean config options, as well as
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positive integers represented in str form.
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:returns:
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Indentation value, which can be
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-1 (automatically determine indentation) or
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0 (auto-indent turned off) or
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>0 (explicitly set indentation position).
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"""
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if auto_indent_option is None:
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return 0
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elif isinstance(auto_indent_option, bool):
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if auto_indent_option:
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return -1
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else:
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return 0
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elif isinstance(auto_indent_option, int):
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return int(auto_indent_option)
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elif isinstance(auto_indent_option, str):
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try:
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return int(auto_indent_option)
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except ValueError:
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pass
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try:
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if _strtobool(auto_indent_option):
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return -1
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except ValueError:
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return 0
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return 0
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def format(self, record: logging.LogRecord) -> str:
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if "\n" in record.message:
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if hasattr(record, "auto_indent"):
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# Passed in from the "extra={}" kwarg on the call to logging.log().
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auto_indent = self._get_auto_indent(record.auto_indent) # type: ignore[attr-defined]
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else:
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auto_indent = self._auto_indent
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if auto_indent:
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lines = record.message.splitlines()
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formatted = self._fmt % self._update_message(record.__dict__, lines[0])
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if auto_indent < 0:
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indentation = _remove_ansi_escape_sequences(formatted).find(
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lines[0]
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)
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else:
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# Optimizes logging by allowing a fixed indentation.
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indentation = auto_indent
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lines[0] = formatted
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return ("\n" + " " * indentation).join(lines)
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return self._fmt % record.__dict__
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def get_option_ini(config: Config, *names: str):
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for name in names:
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ret = config.getoption(name) # 'default' arg won't work as expected
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if ret is None:
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ret = config.getini(name)
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if ret:
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return ret
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def pytest_addoption(parser: Parser) -> None:
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"""Add options to control log capturing."""
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group = parser.getgroup("logging")
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def add_option_ini(option, dest, default=None, type=None, **kwargs):
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parser.addini(
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dest, default=default, type=type, help="default value for " + option
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)
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group.addoption(option, dest=dest, **kwargs)
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add_option_ini(
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"--log-level",
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dest="log_level",
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default=None,
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metavar="LEVEL",
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help=(
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"level of messages to catch/display.\n"
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"Not set by default, so it depends on the root/parent log handler's"
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' effective level, where it is "WARNING" by default.'
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),
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)
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add_option_ini(
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"--log-format",
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dest="log_format",
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default=DEFAULT_LOG_FORMAT,
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help="log format as used by the logging module.",
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)
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add_option_ini(
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"--log-date-format",
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dest="log_date_format",
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default=DEFAULT_LOG_DATE_FORMAT,
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help="log date format as used by the logging module.",
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)
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parser.addini(
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"log_cli",
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default=False,
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type="bool",
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help='enable log display during test run (also known as "live logging").',
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)
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add_option_ini(
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"--log-cli-level", dest="log_cli_level", default=None, help="cli logging level."
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)
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add_option_ini(
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"--log-cli-format",
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dest="log_cli_format",
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default=None,
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help="log format as used by the logging module.",
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)
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add_option_ini(
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"--log-cli-date-format",
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dest="log_cli_date_format",
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default=None,
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help="log date format as used by the logging module.",
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)
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add_option_ini(
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"--log-file",
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dest="log_file",
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default=None,
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help="path to a file when logging will be written to.",
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)
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add_option_ini(
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"--log-file-level",
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dest="log_file_level",
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default=None,
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help="log file logging level.",
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)
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add_option_ini(
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"--log-file-format",
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dest="log_file_format",
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default=DEFAULT_LOG_FORMAT,
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help="log format as used by the logging module.",
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)
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add_option_ini(
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"--log-file-date-format",
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dest="log_file_date_format",
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default=DEFAULT_LOG_DATE_FORMAT,
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help="log date format as used by the logging module.",
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)
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add_option_ini(
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"--log-auto-indent",
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dest="log_auto_indent",
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default=None,
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help="Auto-indent multiline messages passed to the logging module. Accepts true|on, false|off or an integer.",
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)
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_HandlerType = TypeVar("_HandlerType", bound=logging.Handler)
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# Not using @contextmanager for performance reasons.
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class catching_logs:
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"""Context manager that prepares the whole logging machinery properly."""
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__slots__ = ("handler", "level", "orig_level")
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def __init__(self, handler: _HandlerType, level: Optional[int] = None) -> None:
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self.handler = handler
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self.level = level
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def __enter__(self):
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root_logger = logging.getLogger()
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if self.level is not None:
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self.handler.setLevel(self.level)
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root_logger.addHandler(self.handler)
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if self.level is not None:
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self.orig_level = root_logger.level
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root_logger.setLevel(min(self.orig_level, self.level))
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return self.handler
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def __exit__(self, type, value, traceback):
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root_logger = logging.getLogger()
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if self.level is not None:
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root_logger.setLevel(self.orig_level)
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root_logger.removeHandler(self.handler)
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class LogCaptureHandler(logging.StreamHandler):
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"""A logging handler that stores log records and the log text."""
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stream: StringIO
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def __init__(self) -> None:
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"""Create a new log handler."""
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super().__init__(StringIO())
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self.records: List[logging.LogRecord] = []
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def emit(self, record: logging.LogRecord) -> None:
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"""Keep the log records in a list in addition to the log text."""
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self.records.append(record)
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super().emit(record)
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def reset(self) -> None:
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self.records = []
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self.stream = StringIO()
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def handleError(self, record: logging.LogRecord) -> None:
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if logging.raiseExceptions:
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# Fail the test if the log message is bad (emit failed).
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# The default behavior of logging is to print "Logging error"
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# to stderr with the call stack and some extra details.
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# pytest wants to make such mistakes visible during testing.
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raise
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@final
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class LogCaptureFixture:
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"""Provides access and control of log capturing."""
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def __init__(self, item: nodes.Node, *, _ispytest: bool = False) -> None:
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check_ispytest(_ispytest)
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self._item = item
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self._initial_handler_level: Optional[int] = None
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# Dict of log name -> log level.
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self._initial_logger_levels: Dict[Optional[str], int] = {}
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def _finalize(self) -> None:
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"""Finalize the fixture.
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This restores the log levels changed by :meth:`set_level`.
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"""
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# Restore log levels.
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if self._initial_handler_level is not None:
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self.handler.setLevel(self._initial_handler_level)
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for logger_name, level in self._initial_logger_levels.items():
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logger = logging.getLogger(logger_name)
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logger.setLevel(level)
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@property
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def handler(self) -> LogCaptureHandler:
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"""Get the logging handler used by the fixture.
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:rtype: LogCaptureHandler
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"""
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return self._item._store[caplog_handler_key]
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def get_records(self, when: str) -> List[logging.LogRecord]:
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"""Get the logging records for one of the possible test phases.
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:param str when:
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Which test phase to obtain the records from. Valid values are: "setup", "call" and "teardown".
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:returns: The list of captured records at the given stage.
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:rtype: List[logging.LogRecord]
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.. versionadded:: 3.4
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"""
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return self._item._store[caplog_records_key].get(when, [])
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@property
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def text(self) -> str:
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"""The formatted log text."""
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return _remove_ansi_escape_sequences(self.handler.stream.getvalue())
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@property
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def records(self) -> List[logging.LogRecord]:
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"""The list of log records."""
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return self.handler.records
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@property
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def record_tuples(self) -> List[Tuple[str, int, str]]:
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"""A list of a stripped down version of log records intended
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for use in assertion comparison.
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The format of the tuple is:
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(logger_name, log_level, message)
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"""
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return [(r.name, r.levelno, r.getMessage()) for r in self.records]
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@property
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def messages(self) -> List[str]:
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"""A list of format-interpolated log messages.
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Unlike 'records', which contains the format string and parameters for
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interpolation, log messages in this list are all interpolated.
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Unlike 'text', which contains the output from the handler, log
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messages in this list are unadorned with levels, timestamps, etc,
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making exact comparisons more reliable.
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Note that traceback or stack info (from :func:`logging.exception` or
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the `exc_info` or `stack_info` arguments to the logging functions) is
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not included, as this is added by the formatter in the handler.
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.. versionadded:: 3.7
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"""
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return [r.getMessage() for r in self.records]
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def clear(self) -> None:
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"""Reset the list of log records and the captured log text."""
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self.handler.reset()
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def set_level(self, level: Union[int, str], logger: Optional[str] = None) -> None:
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"""Set the level of a logger for the duration of a test.
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.. versionchanged:: 3.4
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The levels of the loggers changed by this function will be
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restored to their initial values at the end of the test.
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:param int level: The level.
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:param str logger: The logger to update. If not given, the root logger.
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"""
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logger_obj = logging.getLogger(logger)
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# Save the original log-level to restore it during teardown.
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self._initial_logger_levels.setdefault(logger, logger_obj.level)
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logger_obj.setLevel(level)
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if self._initial_handler_level is None:
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self._initial_handler_level = self.handler.level
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self.handler.setLevel(level)
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@contextmanager
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def at_level(
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self, level: int, logger: Optional[str] = None
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) -> Generator[None, None, None]:
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"""Context manager that sets the level for capturing of logs. After
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the end of the 'with' statement the level is restored to its original
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value.
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:param int level: The level.
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:param str logger: The logger to update. If not given, the root logger.
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"""
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logger_obj = logging.getLogger(logger)
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orig_level = logger_obj.level
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logger_obj.setLevel(level)
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handler_orig_level = self.handler.level
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self.handler.setLevel(level)
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try:
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yield
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finally:
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logger_obj.setLevel(orig_level)
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self.handler.setLevel(handler_orig_level)
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|
|
|
|
@fixture
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def caplog(request: FixtureRequest) -> Generator[LogCaptureFixture, None, None]:
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"""Access and control log capturing.
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|
Captured logs are available through the following properties/methods::
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* caplog.messages -> list of format-interpolated log messages
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* caplog.text -> string containing formatted log output
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* caplog.records -> list of logging.LogRecord instances
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* caplog.record_tuples -> list of (logger_name, level, message) tuples
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* caplog.clear() -> clear captured records and formatted log output string
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"""
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result = LogCaptureFixture(request.node, _ispytest=True)
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yield result
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result._finalize()
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|
|
|
|
def get_log_level_for_setting(config: Config, *setting_names: str) -> Optional[int]:
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for setting_name in setting_names:
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log_level = config.getoption(setting_name)
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if log_level is None:
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log_level = config.getini(setting_name)
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if log_level:
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break
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else:
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return None
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|
|
if isinstance(log_level, str):
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log_level = log_level.upper()
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try:
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return int(getattr(logging, log_level, log_level))
|
|
except ValueError as e:
|
|
# Python logging does not recognise this as a logging level
|
|
raise UsageError(
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"'{}' is not recognized as a logging level name for "
|
|
"'{}'. Please consider passing the "
|
|
"logging level num instead.".format(log_level, setting_name)
|
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) from e
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|
|
|
|
# run after terminalreporter/capturemanager are configured
|
|
@hookimpl(trylast=True)
|
|
def pytest_configure(config: Config) -> None:
|
|
config.pluginmanager.register(LoggingPlugin(config), "logging-plugin")
|
|
|
|
|
|
class LoggingPlugin:
|
|
"""Attaches to the logging module and captures log messages for each test."""
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def __init__(self, config: Config) -> None:
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"""Create a new plugin to capture log messages.
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The formatter can be safely shared across all handlers so
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create a single one for the entire test session here.
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"""
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self._config = config
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# Report logging.
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self.formatter = self._create_formatter(
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get_option_ini(config, "log_format"),
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get_option_ini(config, "log_date_format"),
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get_option_ini(config, "log_auto_indent"),
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)
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self.log_level = get_log_level_for_setting(config, "log_level")
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self.caplog_handler = LogCaptureHandler()
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self.caplog_handler.setFormatter(self.formatter)
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self.report_handler = LogCaptureHandler()
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self.report_handler.setFormatter(self.formatter)
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# File logging.
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self.log_file_level = get_log_level_for_setting(config, "log_file_level")
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log_file = get_option_ini(config, "log_file") or os.devnull
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if log_file != os.devnull:
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directory = os.path.dirname(os.path.abspath(log_file))
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if not os.path.isdir(directory):
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os.makedirs(directory)
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self.log_file_handler = _FileHandler(log_file, mode="w", encoding="UTF-8")
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log_file_format = get_option_ini(config, "log_file_format", "log_format")
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log_file_date_format = get_option_ini(
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config, "log_file_date_format", "log_date_format"
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)
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log_file_formatter = logging.Formatter(
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log_file_format, datefmt=log_file_date_format
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)
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self.log_file_handler.setFormatter(log_file_formatter)
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# CLI/live logging.
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self.log_cli_level = get_log_level_for_setting(
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config, "log_cli_level", "log_level"
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)
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if self._log_cli_enabled():
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terminal_reporter = config.pluginmanager.get_plugin("terminalreporter")
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capture_manager = config.pluginmanager.get_plugin("capturemanager")
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# if capturemanager plugin is disabled, live logging still works.
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self.log_cli_handler: Union[
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_LiveLoggingStreamHandler, _LiveLoggingNullHandler
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] = _LiveLoggingStreamHandler(terminal_reporter, capture_manager)
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else:
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self.log_cli_handler = _LiveLoggingNullHandler()
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log_cli_formatter = self._create_formatter(
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get_option_ini(config, "log_cli_format", "log_format"),
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get_option_ini(config, "log_cli_date_format", "log_date_format"),
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get_option_ini(config, "log_auto_indent"),
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)
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self.log_cli_handler.setFormatter(log_cli_formatter)
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def _create_formatter(self, log_format, log_date_format, auto_indent):
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# Color option doesn't exist if terminal plugin is disabled.
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color = getattr(self._config.option, "color", "no")
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if color != "no" and ColoredLevelFormatter.LEVELNAME_FMT_REGEX.search(
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log_format
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):
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formatter: logging.Formatter = ColoredLevelFormatter(
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create_terminal_writer(self._config), log_format, log_date_format
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)
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else:
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formatter = logging.Formatter(log_format, log_date_format)
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formatter._style = PercentStyleMultiline(
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formatter._style._fmt, auto_indent=auto_indent
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)
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return formatter
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def set_log_path(self, fname: str) -> None:
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"""Set the filename parameter for Logging.FileHandler().
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Creates parent directory if it does not exist.
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.. warning::
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This is an experimental API.
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"""
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fpath = Path(fname)
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if not fpath.is_absolute():
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fpath = self._config.rootpath / fpath
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if not fpath.parent.exists():
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fpath.parent.mkdir(exist_ok=True, parents=True)
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stream = fpath.open(mode="w", encoding="UTF-8")
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if sys.version_info >= (3, 7):
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old_stream = self.log_file_handler.setStream(stream)
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else:
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old_stream = self.log_file_handler.stream
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self.log_file_handler.acquire()
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try:
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self.log_file_handler.flush()
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self.log_file_handler.stream = stream
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finally:
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self.log_file_handler.release()
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if old_stream:
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old_stream.close()
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def _log_cli_enabled(self):
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"""Return whether live logging is enabled."""
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enabled = self._config.getoption(
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"--log-cli-level"
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) is not None or self._config.getini("log_cli")
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if not enabled:
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return False
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terminal_reporter = self._config.pluginmanager.get_plugin("terminalreporter")
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if terminal_reporter is None:
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# terminal reporter is disabled e.g. by pytest-xdist.
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return False
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return True
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@hookimpl(hookwrapper=True, tryfirst=True)
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def pytest_sessionstart(self) -> Generator[None, None, None]:
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self.log_cli_handler.set_when("sessionstart")
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with catching_logs(self.log_cli_handler, level=self.log_cli_level):
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with catching_logs(self.log_file_handler, level=self.log_file_level):
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yield
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@hookimpl(hookwrapper=True, tryfirst=True)
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def pytest_collection(self) -> Generator[None, None, None]:
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self.log_cli_handler.set_when("collection")
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with catching_logs(self.log_cli_handler, level=self.log_cli_level):
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with catching_logs(self.log_file_handler, level=self.log_file_level):
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yield
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@hookimpl(hookwrapper=True)
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def pytest_runtestloop(self, session: Session) -> Generator[None, None, None]:
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if session.config.option.collectonly:
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yield
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return
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if self._log_cli_enabled() and self._config.getoption("verbose") < 1:
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# The verbose flag is needed to avoid messy test progress output.
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self._config.option.verbose = 1
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with catching_logs(self.log_cli_handler, level=self.log_cli_level):
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with catching_logs(self.log_file_handler, level=self.log_file_level):
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yield # Run all the tests.
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@hookimpl
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def pytest_runtest_logstart(self) -> None:
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self.log_cli_handler.reset()
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self.log_cli_handler.set_when("start")
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@hookimpl
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def pytest_runtest_logreport(self) -> None:
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self.log_cli_handler.set_when("logreport")
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def _runtest_for(self, item: nodes.Item, when: str) -> Generator[None, None, None]:
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"""Implement the internals of the pytest_runtest_xxx() hooks."""
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with catching_logs(
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self.caplog_handler, level=self.log_level,
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) as caplog_handler, catching_logs(
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self.report_handler, level=self.log_level,
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) as report_handler:
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caplog_handler.reset()
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report_handler.reset()
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item._store[caplog_records_key][when] = caplog_handler.records
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item._store[caplog_handler_key] = caplog_handler
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yield
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log = report_handler.stream.getvalue().strip()
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item.add_report_section(when, "log", log)
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@hookimpl(hookwrapper=True)
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def pytest_runtest_setup(self, item: nodes.Item) -> Generator[None, None, None]:
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self.log_cli_handler.set_when("setup")
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empty: Dict[str, List[logging.LogRecord]] = {}
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item._store[caplog_records_key] = empty
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yield from self._runtest_for(item, "setup")
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@hookimpl(hookwrapper=True)
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def pytest_runtest_call(self, item: nodes.Item) -> Generator[None, None, None]:
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self.log_cli_handler.set_when("call")
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yield from self._runtest_for(item, "call")
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@hookimpl(hookwrapper=True)
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def pytest_runtest_teardown(self, item: nodes.Item) -> Generator[None, None, None]:
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self.log_cli_handler.set_when("teardown")
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yield from self._runtest_for(item, "teardown")
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del item._store[caplog_records_key]
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del item._store[caplog_handler_key]
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@hookimpl
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def pytest_runtest_logfinish(self) -> None:
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self.log_cli_handler.set_when("finish")
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@hookimpl(hookwrapper=True, tryfirst=True)
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def pytest_sessionfinish(self) -> Generator[None, None, None]:
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self.log_cli_handler.set_when("sessionfinish")
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with catching_logs(self.log_cli_handler, level=self.log_cli_level):
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with catching_logs(self.log_file_handler, level=self.log_file_level):
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yield
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@hookimpl
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def pytest_unconfigure(self) -> None:
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# Close the FileHandler explicitly.
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# (logging.shutdown might have lost the weakref?!)
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self.log_file_handler.close()
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class _FileHandler(logging.FileHandler):
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"""A logging FileHandler with pytest tweaks."""
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def handleError(self, record: logging.LogRecord) -> None:
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# Handled by LogCaptureHandler.
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pass
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class _LiveLoggingStreamHandler(logging.StreamHandler):
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"""A logging StreamHandler used by the live logging feature: it will
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write a newline before the first log message in each test.
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During live logging we must also explicitly disable stdout/stderr
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capturing otherwise it will get captured and won't appear in the
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terminal.
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"""
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# Officially stream needs to be a IO[str], but TerminalReporter
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# isn't. So force it.
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stream: TerminalReporter = None # type: ignore
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def __init__(
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self,
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terminal_reporter: TerminalReporter,
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capture_manager: Optional[CaptureManager],
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) -> None:
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logging.StreamHandler.__init__(self, stream=terminal_reporter) # type: ignore[arg-type]
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self.capture_manager = capture_manager
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self.reset()
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self.set_when(None)
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self._test_outcome_written = False
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def reset(self) -> None:
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"""Reset the handler; should be called before the start of each test."""
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self._first_record_emitted = False
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def set_when(self, when: Optional[str]) -> None:
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"""Prepare for the given test phase (setup/call/teardown)."""
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self._when = when
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self._section_name_shown = False
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if when == "start":
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self._test_outcome_written = False
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def emit(self, record: logging.LogRecord) -> None:
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ctx_manager = (
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self.capture_manager.global_and_fixture_disabled()
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if self.capture_manager
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else nullcontext()
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)
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with ctx_manager:
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if not self._first_record_emitted:
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self.stream.write("\n")
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self._first_record_emitted = True
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elif self._when in ("teardown", "finish"):
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if not self._test_outcome_written:
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self._test_outcome_written = True
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self.stream.write("\n")
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if not self._section_name_shown and self._when:
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self.stream.section("live log " + self._when, sep="-", bold=True)
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self._section_name_shown = True
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super().emit(record)
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def handleError(self, record: logging.LogRecord) -> None:
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# Handled by LogCaptureHandler.
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pass
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class _LiveLoggingNullHandler(logging.NullHandler):
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"""A logging handler used when live logging is disabled."""
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def reset(self) -> None:
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pass
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def set_when(self, when: str) -> None:
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pass
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def handleError(self, record: logging.LogRecord) -> None:
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# Handled by LogCaptureHandler.
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pass
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