ocrd_utils.logging.initLogging() - Code Metrics - Inspection of "Merge pull request #1117 from OCR-D/logging-2023-1..." - OCR-D/core - Measure and Improve Code Quality continuously with Scrutinizer

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by Konstantin

created 2023-10-18 16:28 UTC

ocrd_utils.logging.initLogging() D

↳ Parent: ocrd_utils.logging

Complexity

Conditions

Size

Total Lines	63
Code Lines	34

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	34
dl	0
loc	63
rs	4.2
c	0
b	0
f	0
cc	13
nop	3

How to fix Long Method Complexity

"""
Logging setup

By default: Log with lastResort logger, usually STDERR.

Logging can be overridden either programmatically in code using the library or by creating one or more of

- /etc/ocrd_logging.py
- $HOME/ocrd_logging.py
- $PWD/ocrd_logging.py

These files will be executed in the context of ocrd/ocrd_logging.py, with `logging` global set.

Changes as of 2023-08-20:

    - Try to be less intrusive with OCR-D specific logging conventions to
      make it easier and less surprising to define logging behavior when
      using OCR-D/core as a library
    - Change setOverrideLogLevel to only override the log level of the ``ocrd``
      logger and its descendants
    - initLogging will set exactly one handler, for the root logger or for the
      ``ocrd`` logger.
    - Child loggers should propagate to the ancestor logging (default
      behavior of the logging library - no more PropagationShyLogger)
    - disableLogging only removes any handlers from the ``ocrd`` logger
"""
# pylint: disable=no-member

from __future__ import absolute_import

from traceback import format_stack

import logging
import logging.config
from pathlib import Path
import sys

from .constants import LOG_FORMAT, LOG_TIMEFMT
from .config import config


__all__ = [
    'disableLogging',
    'getLevelName',
    'getLogger',
    'initLogging',
    'logging',
    'setOverrideLogLevel',
]

# These are the loggers we add handlers to
ROOT_OCRD_LOGGERS = [
    'ocrd',
    'ocrd_network'
]

LOGGING_DEFAULTS = {
    'ocrd': logging.INFO,
    'ocrd_network': logging.DEBUG,
    # 'ocrd.resolver': logging.INFO,
    # 'ocrd.resolver.download_to_directory': logging.INFO,
    # 'ocrd.resolver.add_files_to_mets': logging.INFO,
    # To cut back on the `Self-intersection at or near point` INFO messages
    'shapely.geos': logging.ERROR,
    'tensorflow': logging.ERROR,
    'PIL': logging.INFO,
    'paramiko.transport': logging.INFO,
    'uvicorn.access': logging.DEBUG,
    'uvicorn.error': logging.DEBUG,
    'uvicorn': logging.INFO,
    'multipart': logging.INFO,
}

_initialized_flag = False

_ocrdLevel2pythonLevel = {
    'TRACE': 'DEBUG',
    'OFF': 'CRITICAL',
    'FATAL': 'ERROR',
}

def tf_disable_interactive_logs():
    try:
        from os import environ
        # This env variable must be set before importing from Keras
        environ['TF_CPP_MIN_LOG_LEVEL'] = '3'
        from tensorflow.keras.utils import disable_interactive_logging
        # Enabled interactive logging throws an exception
        # due to a call of sys.stdout.flush()
        disable_interactive_logging()
    except ImportError:
        # Nothing should be handled here if TF is not available
        pass

def getLevelName(lvl):
    """
    Get (string) python logging level for (string) spec-defined log level name.
    """
    lvl = _ocrdLevel2pythonLevel.get(lvl, lvl)
    return logging.getLevelName(lvl)

def getLogger(*args, **kwargs):
    """
    Wrapper around ``logging.getLogger`` that alls :py:func:`initLogging` if
    that wasn't explicitly called before.
    """
    logger = logging.getLogger(*args, **kwargs)
    return logger

def setOverrideLogLevel(lvl, silent=not config.OCRD_LOGGING_DEBUG):
    """
    Override the output log level of the handlers attached to the ``ocrd`` logger.

    Args:
        lvl (string): Log level name.
        silent (boolean): Whether to log the override call
    """
    if not _initialized_flag:
        initLogging(silent=silent)
    ocrd_logger = logging.getLogger('ocrd')

    if lvl is None:
        if not silent:
            print('[LOGGING] Reset log level override', file=sys.stderr)
        ocrd_logger.setLevel(logging.NOTSET)
    else:
        if not silent:
            print(f'[LOGGING] Overriding ocrd log level to {lvl}', file=sys.stderr)
        ocrd_logger.setLevel(lvl)

def initLogging(builtin_only=False, force_reinit=False, silent=not config.OCRD_LOGGING_DEBUG):
    """
    Reset ``ocrd`` logger, read logging configuration if exists, otherwise use basicConfig

    initLogging is to be called by OCR-D/core once, i.e.
        -  for the ``ocrd`` CLI
        -  for the processor wrapper methods

    Other processes that use OCR-D/core as a library can, but do not have to, use this functionality.

    Keyword Args:
        - builtin_only (bool, False): Whether to search for logging configuration
                                      on-disk (``False``) or only use the
                                      hard-coded config (``True``). For testing
        - force_reinit (bool, False): Whether to ignore the module-level
                                      ``_initialized_flag``. For testing only.
        - silent (bool, True): Whether to log logging behavior by printing to stderr
    """
    global _initialized_flag
    if _initialized_flag and not force_reinit:
        return
    # disableLogging()

    # https://docs.python.org/3/library/logging.html#logging.disable
    # If logging.disable(logging.NOTSET) is called, it effectively removes this
    # overriding level, so that logging output again depends on the effective
    # levels of individual loggers.
    logging.disable(logging.NOTSET)

    # remove all handlers for the ocrd root loggers
    for logger_name in ROOT_OCRD_LOGGERS:
        for handler in logging.getLogger(logger_name).handlers[:]:
            logging.getLogger(logger_name).removeHandler(handler)

    config_file = None
    if not builtin_only:
        CONFIG_PATHS = [
            Path.cwd(),
            Path.home(),
            Path('/etc'),
        ]
        config_file = [f for f \
                in [p / 'ocrd_logging.conf' for p in CONFIG_PATHS] \
                if f.exists()]
    if config_file:
        if len(config_file) > 1 and not silent:
            print(f"[LOGGING] Multiple logging configuration files found at {config_file}, using first one", file=sys.stderr)
        config_file = config_file[0]
        if not silent:
            print(f"[LOGGING] Picked up logging config at {config_file}", file=sys.stderr)
        logging.config.fileConfig(config_file)
    else:
        if not silent:
            print("[LOGGING] Initializing logging with built-in defaults", file=sys.stderr)
        # Default logging config
        ocrd_handler = logging.StreamHandler(stream=sys.stderr)
        ocrd_handler.setFormatter(logging.Formatter(fmt=LOG_FORMAT, datefmt=LOG_TIMEFMT))
        ocrd_handler.setLevel(logging.DEBUG)
        for logger_name in ROOT_OCRD_LOGGERS:
            logging.getLogger(logger_name).addHandler(ocrd_handler)
        for logger_name, logger_level in LOGGING_DEFAULTS.items():
            logging.getLogger(logger_name).setLevel(logger_level)
    _initialized_flag = True

def disableLogging(silent=not config.OCRD_LOGGING_DEBUG):
    """
    Disables all logging of the ``ocrd`` logger and descendants

    Keyword Args:
        - silent (bool, True): Whether to log logging behavior by printing to stderr
    """
    global _initialized_flag # pylint: disable=global-statement
    if _initialized_flag and not silent:
        print("[LOGGING] Disabling logging", file=sys.stderr)
    _initialized_flag = False
    # logging.basicConfig(level=logging.CRITICAL)
    # logging.disable(logging.ERROR)
    # remove all handlers for the ocrd logger
    for logger_name in ROOT_OCRD_LOGGERS:
        for handler in logging.getLogger(logger_name).handlers[:]:
            logging.getLogger(logger_name).removeHandler(handler)
    for logger_name in LOGGING_DEFAULTS:
        logging.getLogger(logger_name).setLevel(logging.NOTSET)

# Initializing stream handlers at module level
# would cause message output in all runtime contexts,
# including those which are already run for std output
# (--dump-json, --version, ocrd-tool, bashlib etc).
# So this needs to be an opt-in from the CLIs/decorators:
#initLogging()
# Also, we even have to block log output for libraries
# (like matplotlib/tensorflow) which set up logging
# themselves already:
disableLogging()


1			"""
2			Logging setup
3
4			By default: Log with lastResort logger, usually STDERR.
5
6			Logging can be overridden either programmatically in code using the library or by creating one or more of
7
8			- /etc/ocrd_logging.py
9			- $HOME/ocrd_logging.py
10			- $PWD/ocrd_logging.py
11
12			These files will be executed in the context of ocrd/ocrd_logging.py, with `logging` global set.
13
14			Changes as of 2023-08-20:
15
16			- Try to be less intrusive with OCR-D specific logging conventions to
17			make it easier and less surprising to define logging behavior when
18			using OCR-D/core as a library
19			- Change setOverrideLogLevel to only override the log level of the ``ocrd``
20			logger and its descendants
21			- initLogging will set exactly one handler, for the root logger or for the
22			``ocrd`` logger.
23			- Child loggers should propagate to the ancestor logging (default
24			behavior of the logging library - no more PropagationShyLogger)
25			- disableLogging only removes any handlers from the ``ocrd`` logger
26			"""
27			# pylint: disable=no-member
28
29			from __future__ import absolute_import
30
31			from traceback import format_stack
32
33			import logging
34			import logging.config
35			from pathlib import Path
36			import sys
37
38			from .constants import LOG_FORMAT, LOG_TIMEFMT
39			from .config import config
40
41
42			__all__ = [
43			'disableLogging',
44			'getLevelName',
45			'getLogger',
46			'initLogging',
47			'logging',
48			'setOverrideLogLevel',
49			]
50
51			# These are the loggers we add handlers to
52			ROOT_OCRD_LOGGERS = [
53			'ocrd',
54			'ocrd_network'
55			]
56
57			LOGGING_DEFAULTS = {
58			'ocrd': logging.INFO,
59			'ocrd_network': logging.DEBUG,
60			# 'ocrd.resolver': logging.INFO,
61			# 'ocrd.resolver.download_to_directory': logging.INFO,
62			# 'ocrd.resolver.add_files_to_mets': logging.INFO,
63			# To cut back on the `Self-intersection at or near point` INFO messages
64			'shapely.geos': logging.ERROR,
65			'tensorflow': logging.ERROR,
66			'PIL': logging.INFO,
67			'paramiko.transport': logging.INFO,
68			'uvicorn.access': logging.DEBUG,
69			'uvicorn.error': logging.DEBUG,
70			'uvicorn': logging.INFO,
71			'multipart': logging.INFO,
72			}
73
74			_initialized_flag = False
75
76			_ocrdLevel2pythonLevel = {
77			'TRACE': 'DEBUG',
78			'OFF': 'CRITICAL',
79			'FATAL': 'ERROR',
80			}
81
82			def tf_disable_interactive_logs():
83			try:
84			from os import environ
85			# This env variable must be set before importing from Keras
86			environ['TF_CPP_MIN_LOG_LEVEL'] = '3'
87			from tensorflow.keras.utils import disable_interactive_logging
88			# Enabled interactive logging throws an exception
89			# due to a call of sys.stdout.flush()
90			disable_interactive_logging()
91			except ImportError:
92			# Nothing should be handled here if TF is not available
93			pass
94
95			def getLevelName(lvl):
96			"""
97			Get (string) python logging level for (string) spec-defined log level name.
98			"""
99			lvl = _ocrdLevel2pythonLevel.get(lvl, lvl)
100			return logging.getLevelName(lvl)
101
102			def getLogger(args, *kwargs):
103			"""
104			Wrapper around ``logging.getLogger`` that alls :py:func:`initLogging` if
105			that wasn't explicitly called before.
106			"""
107			logger = logging.getLogger(args, *kwargs)
108			return logger
109
110			def setOverrideLogLevel(lvl, silent=not config.OCRD_LOGGING_DEBUG):
111			"""
112			Override the output log level of the handlers attached to the ``ocrd`` logger.
113
114			Args:
115			lvl (string): Log level name.
116			silent (boolean): Whether to log the override call
117			"""
118			if not _initialized_flag:
119			initLogging(silent=silent)
120			ocrd_logger = logging.getLogger('ocrd')
121
122			if lvl is None:
123			if not silent:
124			print('[LOGGING] Reset log level override', file=sys.stderr)
125			ocrd_logger.setLevel(logging.NOTSET)
126			else:
127			if not silent:
128			print(f'[LOGGING] Overriding ocrd log level to {lvl}', file=sys.stderr)
129			ocrd_logger.setLevel(lvl)
130
131			def initLogging(builtin_only=False, force_reinit=False, silent=not config.OCRD_LOGGING_DEBUG):
132			"""
133			Reset ``ocrd`` logger, read logging configuration if exists, otherwise use basicConfig
134
135			initLogging is to be called by OCR-D/core once, i.e.
136			- for the ``ocrd`` CLI
137			- for the processor wrapper methods
138
139			Other processes that use OCR-D/core as a library can, but do not have to, use this functionality.
140
141			Keyword Args:
142			- builtin_only (bool, False): Whether to search for logging configuration
143			on-disk (``False``) or only use the
144			hard-coded config (``True``). For testing
145			- force_reinit (bool, False): Whether to ignore the module-level
146			``_initialized_flag``. For testing only.
147			- silent (bool, True): Whether to log logging behavior by printing to stderr
148			"""
149			global _initialized_flag
150			if _initialized_flag and not force_reinit:
151			return
152			# disableLogging()
153
154			# https://docs.python.org/3/library/logging.html#logging.disable
155			# If logging.disable(logging.NOTSET) is called, it effectively removes this
156			# overriding level, so that logging output again depends on the effective
157			# levels of individual loggers.
158			logging.disable(logging.NOTSET)
159
160			# remove all handlers for the ocrd root loggers
161			for logger_name in ROOT_OCRD_LOGGERS:
162			for handler in logging.getLogger(logger_name).handlers[:]:
163			logging.getLogger(logger_name).removeHandler(handler)
164
165			config_file = None
166			if not builtin_only:
167			CONFIG_PATHS = [
168			Path.cwd(),
169			Path.home(),
170			Path('/etc'),
171			]
172			config_file = [f for f \
173			in [p / 'ocrd_logging.conf' for p in CONFIG_PATHS] \
174			if f.exists()]
175			if config_file:
176			if len(config_file) > 1 and not silent:
177			print(f"[LOGGING] Multiple logging configuration files found at {config_file}, using first one", file=sys.stderr)
178			config_file = config_file[0]
179			if not silent:
180			print(f"[LOGGING] Picked up logging config at {config_file}", file=sys.stderr)
181			logging.config.fileConfig(config_file)
182			else:
183			if not silent:
184			print("[LOGGING] Initializing logging with built-in defaults", file=sys.stderr)
185			# Default logging config
186			ocrd_handler = logging.StreamHandler(stream=sys.stderr)
187			ocrd_handler.setFormatter(logging.Formatter(fmt=LOG_FORMAT, datefmt=LOG_TIMEFMT))
188			ocrd_handler.setLevel(logging.DEBUG)
189			for logger_name in ROOT_OCRD_LOGGERS:
190			logging.getLogger(logger_name).addHandler(ocrd_handler)
191			for logger_name, logger_level in LOGGING_DEFAULTS.items():
192			logging.getLogger(logger_name).setLevel(logger_level)
193			_initialized_flag = True
194
195			def disableLogging(silent=not config.OCRD_LOGGING_DEBUG):
196			"""
197			Disables all logging of the ``ocrd`` logger and descendants
198
199			Keyword Args:
200			- silent (bool, True): Whether to log logging behavior by printing to stderr
201			"""
202			global _initialized_flag # pylint: disable=global-statement
203			if _initialized_flag and not silent:
204			print("[LOGGING] Disabling logging", file=sys.stderr)
205			_initialized_flag = False
206			# logging.basicConfig(level=logging.CRITICAL)
207			# logging.disable(logging.ERROR)
208			# remove all handlers for the ocrd logger
209			for logger_name in ROOT_OCRD_LOGGERS:
210			for handler in logging.getLogger(logger_name).handlers[:]:
211			logging.getLogger(logger_name).removeHandler(handler)
212			for logger_name in LOGGING_DEFAULTS:
213			logging.getLogger(logger_name).setLevel(logging.NOTSET)
214
215			# Initializing stream handlers at module level
216			# would cause message output in all runtime contexts,
217			# including those which are already run for std output
218			# (--dump-json, --version, ocrd-tool, bashlib etc).
219			# So this needs to be an opt-in from the CLIs/decorators:
220			#initLogging()
221			# Also, we even have to block log output for libraries
222			# (like matplotlib/tensorflow) which set up logging
223			# themselves already:
224			disableLogging()
225

OCR-D / core

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ocrd_utils.logging.initLogging() D

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