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options_log_functions.py
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options_log_functions.py
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# --*--codding:utf-8--*--
"""options parser, config and logger setting functions."""
import ConfigParser
import logging
import logging.config
import os
from optparse import OptionParser
def set_options():
"""Create parser to process command line options, returns a dictionary.
:Return:
dictionary with parsed options.
"""
parser = OptionParser(usage='%prog [options]')
# defining required options
parser.add_option('-v', '--verbose', action='store_true', default=False,
help='print info and warning messages [default: %default]'
' log will include only critical and error messages'
' by default')
# parser.add_option('-v', '--verbose', help="verbosity level (0..2)",
# choices=['0', '1', '2'])
parser.add_option('-o', '--operation',
help="choose operation to perform: 'add', 'edit',"
" 'delete', 'retrieve'",
choices=['add', 'edit', 'delete', 'retrieve'])
parser.add_option('-f', '--flag', help='flag value')
(options, args) = parser.parse_args()
if options.operation is None:
parser.print_usage()
parser.exit('Please, choose operation.')
else:
return options
def set_config(options, verbosity=0, database=None):
"""Read configuration options from file, merge them with command line
options.
:Parameters:
- 'options': command line options.
- 'verbosity': verbosity level, int.
- 'database': output database name.
:Return:
- 'verbosity': verbosity level, int.
- 'database': output database name, string.
"""
try:
if options.config:
config = ConfigParser.ConfigParser()
config.read(options.config)
verbosity = config.get('task1', 'verbosity')
database = config.get('base', 'database')
if options.verbose:
verbosity = int(options.verbose)
if options.database:
database = options.database
return verbosity, database
except (ConfigParser.Error, Exception) as err:
raise MyError('Configuration error: %s' % err)
def set_log(verbose, logfile='log.ini', logger_name=None):
"""Create logger, set logging level, read settings from config file.
:Parameters:
- 'verbose': boolean.
- 'logfile': logger configuration file name in current folder, e.g.
'log.conf'.
:Return:
logger object.
"""
try:
dirname = os.getcwd()
log_path = os.path.join(dirname, logfile)
try:
# set up logging
logging.config.fileConfig(log_path)
# create Logger
logger = logging.getLogger(logger_name)
# setting the logging level due to verbose argument
levels = {0: logging.CRITICAL, 1: logging.WARNING, 2: logging.DEBUG}
level = levels.get(verbose)
logger.setLevel(level)
return logger
except (ConfigParser.Error, Exception) as err:
raise MyError(
'Configuration error, check %s: %s' % (log_path, err,))
except (OSError, IOError) as err:
raise MyError('Env error: %s' % (err,))