#!/usr/bin/env python3
# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
# pyre-strict
import logging
import os
from functools import wraps
from typing import Any, Callable, TypeVar, Iterable
AX_ROOT_LOGGER_NAME = "ax"
DEFAULT_LOG_LEVEL: int = logging.INFO
T = TypeVar("T")
[docs]class AxOutputNameFilter(logging.Filter):
"""This is a filter which sets the record's output_name, if
not configured
"""
[docs] def filter(self, record: logging.LogRecord) -> bool:
if not hasattr(record, "output_name"):
# pyre-ignore[16]: Record supports arbitrary attributes
record.output_name = record.name
return True
[docs]def get_logger(name: str) -> logging.Logger:
"""Get an Axlogger.
To set a human-readable "output_name" that appears in logger outputs,
add `{"output_name": "[MY_OUTPUT_NAME]"}` to the logger's contextual
information. By default, we use the logger's `name`
NOTE: To change the log level on particular outputs (e.g. STDERR logs),
set the proper log level on the relevant handler, instead of the logger
e.g. logger.handers[0].setLevel(INFO)
Args:
name: The name of the logger.
Returns:
The logging.Logger object.
"""
logger = logging.getLogger(name)
logger.addFilter(AxOutputNameFilter())
return logger
# pyre-fixme[24]: Generic type `logging.StreamHandler` expects 1 type parameter.
[docs]def build_stream_handler(level: int = DEFAULT_LOG_LEVEL) -> logging.StreamHandler:
"""Build the default stream handler used for most Ax logging. Sets
default level to INFO, instead of WARNING.
Args:
level: The log level. By default, sets level to INFO
Returns:
A logging.StreamHandler instance
"""
console = logging.StreamHandler()
console.setLevel(level=level)
formatter = _build_stream_formatter()
console.setFormatter(formatter)
return console
[docs]def build_file_handler(
filepath: str,
level: int = DEFAULT_LOG_LEVEL
# pyre-fixme[24]: Generic type `logging.StreamHandler` expects 1 type parameter.
) -> logging.StreamHandler:
"""Build a file handle that logs entries to the given file, using the
same formatting as the stream handler.
Args:
filepath: Location of the file to log output to. If the file exists, output
will be appended. If it does not exist, a new file will be created.
level: The log level. By default, sets level to INFO
Returns:
A logging.FileHandler instance
"""
if os.path.isfile(filepath):
get_logger(__name__).warning(
f"Log file ({filepath}) already exists, appending logs."
)
logfile = logging.FileHandler(filepath)
logfile.setLevel(level=level)
formatter = _build_stream_formatter()
logfile.setFormatter(formatter)
return logfile
def _build_stream_formatter() -> logging.Formatter:
"""Default formatter for log messages. Add timestamps to log messages."""
return logging.Formatter(
fmt="[%(levelname)s %(asctime)s] %(output_name)s: %(message)s",
datefmt="%m-%d %H:%M:%S",
)
# pyre-ignore (ignoring Any in argument and output typing)
def _round_floats_for_logging(item: Any, decimal_places: int = 2) -> Any:
"""Round a number or numbers in a mapping to a given number of decimal places.
If item or values in dictionary is not a number, returns it as it.
"""
if isinstance(item, float):
return round(item, decimal_places)
elif isinstance(item, dict):
return {
k: _round_floats_for_logging(item=v, decimal_places=decimal_places)
for k, v in item.items()
}
elif isinstance(item, list):
return [
_round_floats_for_logging(item=i, decimal_places=decimal_places)
for i in item
]
elif isinstance(item, tuple):
return tuple(
_round_floats_for_logging(item=i, decimal_places=decimal_places)
for i in item
)
return item
[docs]def set_stderr_log_level(level: int) -> None:
"""Set the log level for stream handler, such that logs of given level
are printed to STDERR by the root logger
"""
ROOT_STREAM_HANDLER.setLevel(level)
# pyre-ignore[3] Supports generic callables
[docs]def disable_logger(
name: str, level: int = logging.ERROR
) -> Callable[[Callable[..., Any]], Callable[..., Any]]:
"""Disables a specific logger by name (e.g. module path) by setting the
log level at the given one for the duration of the decorated function's call
"""
def decorator(func: Callable[..., T]) -> Callable[..., T]:
@wraps(func)
def inner(*args: Any, **kwargs: Any) -> T:
logger = get_logger(name)
prev_level = logger.getEffectiveLevel()
logger.setLevel(level)
try:
return func(*args, **kwargs)
finally:
logger.setLevel(prev_level)
return inner
return decorator
"""Sets up Ax's root logger to not propogate to Python's root logger and
use the default stream handler.
"""
ROOT_LOGGER: logging.Logger = get_logger(AX_ROOT_LOGGER_NAME)
ROOT_LOGGER.propagate = False
# Uses a permissive level on the logger, instead make each
# handler as permissive/restrictive as desired
ROOT_LOGGER.setLevel(logging.DEBUG)
# pyre-fixme[24]: Generic type `logging.StreamHandler` expects 1 type parameter.
ROOT_STREAM_HANDLER: logging.StreamHandler = build_stream_handler()
ROOT_LOGGER.addHandler(ROOT_STREAM_HANDLER)
[docs]def make_indices_str(indices: Iterable[int]) -> str:
"""Generate a string representation of an iterable of indices;
if indices are contiguous, returns a string formatted like like
'<min_idx> - <max_idx>', otherwise a string formatted like
'[idx_1, idx_2, ..., idx_n'].
"""
idcs = sorted(indices)
contiguous = len(idcs) > 1 and (idcs[-1] - idcs[0] == len(idcs) - 1)
return f"{idcs[0]} - {idcs[-1]}" if contiguous else f"{idcs}"
