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Mini Shell
# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
"""
Extensions for validation and output formatting argparse
"""
import argparse
import pwd
import datetime
from prettytable import PrettyTable
from lvestats.lib.commons.dateutil import parse_date, parse_period2
class SmartFormatter(argparse.HelpFormatter):
"""
Format argparse help in many line, to format many lines use "R|" at start line
>>>import argparse
>>>parser = argparse.ArgumentParser(formatter_class=SmartFormatter)
>>>parser.add_argument('-a', '--argument', help="R| Descriptions: \\n first new line\\n second new line")
"""
def _split_lines(self, text, width):
if text.startswith('R|'):
return text[2:].splitlines()
return argparse.HelpFormatter._split_lines(self, text, width) # pylint: disable=protected-access
def _format_args(self, action, default_metavar):
if isinstance(action, ParseDatetime):
get_metavar = self._metavar_formatter(action, default_metavar)
return str(get_metavar(1))
return argparse.HelpFormatter._format_args(self, action, default_metavar) # pylint: disable=protected-access
class ParseDatetime(argparse.Action):
"""
Interprets a string ([YY]YY-MM-DD[ HH:MM]) as a datetime for argument parsing.
return parsed data as <type 'datetime.datetime'>
"""
def __call__(self, parser, namespace, values, option_string=None):
datetime_str = ' '.join(values) if hasattr(values, '__iter__') else values
try:
result_datetime = parse_date(datetime_str)
except ValueError as e:
raise argparse.ArgumentError(
self,
f"{datetime_str} is an invalid; use [YY]YY-MM-DD[ HH:MM] format",
) from e
setattr(namespace, self.dest, result_datetime)
def check_percentages(value):
"""
Check if input argument between 0 and 100
:param str value:
:return int: percent
:except argparse.ArgumentTypeError: generate exception for command line warning message
"""
value = int(value)
if value < 0 or value > 100:
raise argparse.ArgumentTypeError(f"{value} is an invalid; this value can range from 0 to 100")
return value
def check_non_negative_int(value):
"""
Check if input argument greater than (or equal to) zero and not float
:param str value:
:return int:
:except argparse.ArgumentTypeError: generate exception for command line warning message
"""
try:
non_negative_int = int(value)
except ValueError as e:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; must be a number greater than (or equal to) zero'
) from e
if '.' in value or non_negative_int < 0:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; must be a number greater than (or equal to) zero'
)
return non_negative_int
def check_positive_int(value):
"""
Check if input argument is digest, greater than zero and not float
:param str value: line to check
:return int: positive integer
:except argparse.ArgumentTypeError: generate exception for command line warning message
"""
try:
positive_int = int(value)
except ValueError as e:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; must be a number greater than zero'
) from e
if '.' in value or positive_int <= 0:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; must be a number greater than zero'
)
return positive_int
def check_timestamp(value):
"""
Check if input argument is a correct timestamp
253370754000.0 == time.mktime(datetime.datetime(year=datetime.MAXYEAR, month=1, day=1).timetuple())
:param str value: line to check
:return float: timestamp
:except argparse.ArgumentTypeError: generate exception for command line warning message
"""
try:
positive_float = float(value)
except ValueError as e:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; timestamp must be a number between 0 and 253370754000'
) from e
if not 0 < positive_float < 253370754000:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; timestamp must be a number between 0 and 253370754000'
)
return positive_float
def check_from_zero_to_max_int(value):
"""
Check if input argument less then maximum integer number
PostgreSQL - 2147483647
MySQL - 2147483647
SQLite - 9223372036854775807
:param str value:
:return int:
:except argparse.ArgumentTypeError: generate exception for command line warning message
"""
max_int = 2147483647
try:
non_negative_int = int(value)
except ValueError as e:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; must be a number greater than (or equal to) zero '
f'and less than {max_int}'
) from e
if '.' in value or non_negative_int < 0 or non_negative_int > max_int:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; must be a number greater than (or equal to) zero '
f'and less than {max_int}'
)
return non_negative_int
def check_user_name(value):
"""
Check if user present in system and convert user name to user id
:param str value: user name (login)
:return int: user id
:except argparse.ArgumentTypeError: generate exception for command line warning message
"""
try:
user_id = pwd.getpwnam(value).pw_uid
except KeyError as e:
raise argparse.ArgumentTypeError(f'user "{value}" not present in system') from e
return user_id
def period_type(value):
"""
Parse multiple period line, and validate input data
:param str value: line to parsing
:return int: period in seconds
:except argparse.ArgumentTypeError: generate exception for command line warning message
"""
try:
int_converted = int(value)
if '.' in value or int_converted <= 0:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; time period should be greater than (or equal to) '
'1 minute (60 seconds); not negative'
)
value = str(int_converted) + 'm' # if only digest convert to minutes
except ValueError:
pass
try:
seconds = parse_period2(value)
except ValueError as e:
raise argparse.ArgumentTypeError(str(e)) from e
if seconds < 60:
raise argparse.ArgumentTypeError(
f'"{value}" is an invalid; time period should be greater than (or equal to) '
'1 minute (60 seconds)'
)
return seconds
def period_type2(value, datetime_now=None, round_to_minutes=True):
"""
Extented period_type function
Added support 'yesterday' and 'today'
:param bool round_to_minutes:
:param str value: line to parsing
:return tuple: period from to (<type 'datetime.datetime'>, <type 'datetime.datetime'>)
:except argparse.ArgumentTypeError: generate exception for command line warning message
"""
datetime_now = datetime_now or datetime.datetime.utcnow()
value = value.lower()
if value == 'yesterday':
datetime_to = datetime_now.replace(hour=0, minute=0, second=0, microsecond=0) # today midnight
datetime_from = datetime_to - datetime.timedelta(days=1) # yesterday midnight
elif value == 'today':
datetime_from = datetime_now.replace(hour=0, minute=0, second=0, microsecond=0) # today midnight
datetime_to = datetime_now
else:
if round_to_minutes:
datetime_from = datetime_now.replace(second=0, microsecond=0) # rounded to minutes
datetime_to = datetime_now.replace(second=0, microsecond=0) # rounded to minutes
else:
datetime_from = datetime_now
datetime_to = datetime_now
datetime_from -= datetime.timedelta(seconds=period_type(value))
return datetime_from, datetime_to
def format_aliases(description):
"""
Prepare aliases descriptions to table formatted
:param tuple|list|iter description: massive of data
:return str: ascii table
"""
fields = description[0]
description = description[1:]
table = PrettyTable(fields, padding_width=0, left_padding=2)
for field in fields:
table.align[field] = "l"
list(map(table.add_row, description))
return table.get_string(border=False)
BY_USAGE_PERCENT = 90
def alias_action(alias_dscr):
alias_dscr = alias_dscr[1:] # first line is headers for descriptions in print tables
aliases_func_dict = _alias_dscr_to_dict(alias_dscr)
class AliasAction(argparse.Action):
def __call__(self, parser, namespace, values, option_string=None):
output_as_list = self.nargs in ('+', '*')
if output_as_list:
values_ = []
for val_ in values: # for using ',' as separator in options
values_.extend(filter(bool, val_.lower().split(',')))
# "filter(bool" for correct processing --show-columns=,ID,
else:
values_ = [values.strip('"').strip("'").lower()]
# generate exception for not supported aliases
not_supported_values = set(values_).difference(set(aliases_func_dict))
if not_supported_values:
supported_values = tuple(aliases_func_dict)
unsupported_aliases = '", "'.join(not_supported_values)
raise argparse.ArgumentError(
self,
f'alias(es) "{unsupported_aliases}" not valid; '
f'choice from: {", ".join(supported_values)}'
)
result = [aliases_func_dict[_] for _ in values_] # replace aliases to main aliases
if not output_as_list:
result = result[0]
setattr(namespace, self.dest, result) # write result to namespace
return AliasAction
def _alias_dscr_to_dict(alias_dscr):
"""
preparation of the dictionary to extract the names of the aggregation function name (used in show_history)
as aliases are used from the first to the penultimate elements alias_dscr
as aggregation function name are used penultimate element
>>> _alias_dscr_to_dict((('al_1', 'al_2', 'al_m1', 'description1'), ('al_3', 'al_4', 'al_m2', 'description1')))
{'al_2': 'al_m1', 'al_1': 'al_m1', 'al_m1': 'al_m1', 'al_3': 'al_m2', 'al_m2': 'al_m2', 'al_4': 'al_m2'}
:param tuple|list alias_dscr:
:type return: dict
"""
val_index_ = -2
aliases_func_pairs = [(_[val_index_].lower(), _[val_index_])for _ in alias_dscr]
for key_index_ in range(len(alias_dscr[0]) - 1):
aliases_func_pairs.extend([(_[key_index_], _[val_index_]) for _ in alias_dscr])
aliases_func_dict = dict(aliases_func_pairs)
return aliases_func_dict
def argparse_process_period(namespace):
# prepare period
period_from, period_to = getattr(namespace, 'from'), namespace.to
if namespace.period:
period_from, period_to = namespace.period
setattr(namespace, 'from', period_from)
namespace.to = period_to
return namespace
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