PyBitmessage-2021-04-27/src/debug.py
mailchuck 231219a193 Improved logging
Fixes #118

- changed almost all "print" into logger
- threads have nicer names
- logger can have configuration in "logger.dat" in the same directory as
"keys.dat", and the logger will pick the one named "default" to replace
the "console" and "file" that are in PyBitmessage otherwise

Example file for logging to syslog:

[loggers]
keys = root,syslog

[logger_root]
level=NOTSET
handlers=syslog

[logger_syslog]
level=DEBUG
handlers=syslog
qualname=default

[handlers]
keys = syslog

[handler_syslog]
class = handlers.SysLogHandler
formatter = syslog
level = DEBUG
args=(('localhost', handlers.SYSLOG_UDP_PORT),
handlers.SysLogHandler.LOG_LOCAL7)

[formatters]
keys = syslog

[formatter_syslog]
format=%(asctime)s %(threadName)s %(filename)s@%(lineno)d %(message)s
datefmt=%b %d %H:%M:%S
2016-05-02 15:00:21 +02:00

116 lines
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Python
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# -*- coding: utf-8 -*-
'''
Logging and debuging facility
=============================
Levels:
DEBUG Detailed information, typically of interest only when diagnosing problems.
INFO Confirmation that things are working as expected.
WARNING An indication that something unexpected happened, or indicative of some problem in the
near future (e.g. disk space low). The software is still working as expected.
ERROR Due to a more serious problem, the software has not been able to perform some function.
CRITICAL A serious error, indicating that the program itself may be unable to continue running.
There are three loggers: `console_only`, `file_only` and `both`.
Use: `from debug import logger` to import this facility into whatever module you wish to log messages from.
Logging is thread-safe so you don't have to worry about locks, just import and log.
'''
import logging
import logging.config
import os
import shared
import sys
import traceback
import helper_startup
helper_startup.loadConfig()
# TODO(xj9): Get from a config file.
log_level = 'DEBUG'
def log_uncaught_exceptions(ex_cls, ex, tb):
logging.critical(''.join(traceback.format_tb(tb)))
logging.critical('{0}: {1}'.format(ex_cls, ex))
def configureLogging():
have_logging = False
try:
logging.config.fileConfig(os.path.join (shared.appdata, 'logging.dat'))
have_logging = True
except:
pass
sys.excepthook = log_uncaught_exceptions
if have_logging:
return False
logging.config.dictConfig({
'version': 1,
'formatters': {
'default': {
'format': '%(asctime)s - %(levelname)s - %(message)s',
},
},
'handlers': {
'console': {
'class': 'logging.StreamHandler',
'formatter': 'default',
'level': log_level,
'stream': 'ext://sys.stdout'
},
'file': {
'class': 'logging.handlers.RotatingFileHandler',
'formatter': 'default',
'level': log_level,
'filename': shared.appdata + 'debug.log',
'maxBytes': 2097152, # 2 MiB
'backupCount': 1,
}
},
'loggers': {
'console_only': {
'handlers': ['console'],
'propagate' : 0
},
'file_only': {
'handlers': ['file'],
'propagate' : 0
},
'both': {
'handlers': ['console', 'file'],
'propagate' : 0
},
},
'root': {
'level': log_level,
'handlers': ['console'],
},
})
return True
# TODO (xj9): Get from a config file.
#logger = logging.getLogger('console_only')
if configureLogging():
if '-c' in sys.argv:
logger = logging.getLogger('file_only')
else:
logger = logging.getLogger('both')
else:
logger = logging.getLogger('default')
def restartLoggingInUpdatedAppdataLocation():
global logger
for i in list(logger.handlers):
logger.removeHandler(i)
i.flush()
i.close()
if configureLogging():
if '-c' in sys.argv:
logger = logging.getLogger('file_only')
else:
logger = logging.getLogger('both')
else:
logger = logging.getLogger('default')