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community.general/plugins/module_utils/mh/mixins/cmd.py

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# -*- coding: utf-8 -*-
# (c) 2020, Alexei Znamensky <russoz@gmail.com>
# Copyright (c) 2020, Ansible Project
# Simplified BSD License (see LICENSES/BSD-2-Clause.txt or https://opensource.org/licenses/BSD-2-Clause)
# SPDX-License-Identifier: BSD-2-Clause
from __future__ import absolute_import, division, print_function
__metaclass__ = type
from functools import partial
class ArgFormat(object):
"""
Argument formatter for use as a command line parameter. Used in CmdMixin.
"""
BOOLEAN = 0
PRINTF = 1
FORMAT = 2
BOOLEAN_NOT = 3
@staticmethod
def stars_deco(num):
if num == 1:
def deco(f):
return lambda v: f(*v)
return deco
elif num == 2:
def deco(f):
return lambda v: f(**v)
return deco
return lambda f: f
def __init__(self, name, fmt=None, style=FORMAT, stars=0):
"""
Creates a CLI-formatter for one specific argument. The argument may be a module parameter or just a named parameter for
the CLI command execution.
:param name: Name of the argument to be formatted
:param fmt: Either a str to be formatted (using or not printf-style) or a callable that does that
:param style: Whether arg_format (as str) should use printf-style formatting.
Ignored if arg_format is None or not a str (should be callable).
:param stars: A int with 0, 1 or 2 value, indicating to formatting the value as: value, *value or **value
"""
def printf_fmt(_fmt, v):
try:
return [_fmt % v]
except TypeError as e:
if e.args[0] != 'not all arguments converted during string formatting':
raise
return [_fmt]
_fmts = {
ArgFormat.BOOLEAN: lambda _fmt, v: ([_fmt] if bool(v) else []),
ArgFormat.BOOLEAN_NOT: lambda _fmt, v: ([] if bool(v) else [_fmt]),
ArgFormat.PRINTF: printf_fmt,
ArgFormat.FORMAT: lambda _fmt, v: [_fmt.format(v)],
}
self.name = name
self.stars = stars
self.style = style
if fmt is None:
fmt = "{0}"
style = ArgFormat.FORMAT
if isinstance(fmt, str):
func = _fmts[style]
self.arg_format = partial(func, fmt)
elif isinstance(fmt, list) or isinstance(fmt, tuple):
self.arg_format = lambda v: [_fmts[style](f, v)[0] for f in fmt]
elif hasattr(fmt, '__call__'):
self.arg_format = fmt
else:
raise TypeError('Parameter fmt must be either: a string, a list/tuple of '
'strings or a function: type={0}, value={1}'.format(type(fmt), fmt))
if stars:
self.arg_format = (self.stars_deco(stars))(self.arg_format)
def to_text(self, value):
if value is None and self.style != ArgFormat.BOOLEAN_NOT:
return []
func = self.arg_format
return [str(p) for p in func(value)]
class CmdMixin(object):
"""
Mixin for mapping module options to running a CLI command with its arguments.
"""
command = None
command_args_formats = {}
run_command_fixed_options = {}
check_rc = False
force_lang = "C"
@property
def module_formats(self):
result = {}
for param in self.module.params.keys():
result[param] = ArgFormat(param)
return result
@property
def custom_formats(self):
result = {}
for param, fmt_spec in self.command_args_formats.items():
result[param] = ArgFormat(param, **fmt_spec)
return result
def _calculate_args(self, extra_params=None, params=None):
def add_arg_formatted_param(_cmd_args, arg_format, _value):
args = list(arg_format.to_text(_value))
return _cmd_args + args
def find_format(_param):
return self.custom_formats.get(_param, self.module_formats.get(_param))
extra_params = extra_params or dict()
cmd_args = list([self.command]) if isinstance(self.command, str) else list(self.command)
try:
cmd_args[0] = self.module.get_bin_path(cmd_args[0], required=True)
except ValueError:
pass
param_list = params if params else self.vars.keys()
for param in param_list:
if isinstance(param, dict):
if len(param) != 1:
self.do_raise("run_command parameter as a dict must contain only one key: {0}".format(param))
_param = list(param.keys())[0]
fmt = find_format(_param)
value = param[_param]
elif isinstance(param, str):
if param in self.vars.keys():
fmt = find_format(param)
value = self.vars[param]
elif param in extra_params:
fmt = find_format(param)
value = extra_params[param]
else:
self.do_raise('Cannot determine value for parameter: {0}'.format(param))
else:
self.do_raise("run_command parameter must be either a str or a dict: {0}".format(param))
cmd_args = add_arg_formatted_param(cmd_args, fmt, value)
return cmd_args
def process_command_output(self, rc, out, err):
return rc, out, err
def run_command(self,
extra_params=None,
params=None,
process_output=None,
publish_rc=True,
publish_out=True,
publish_err=True,
publish_cmd=True,
*args, **kwargs):
cmd_args = self._calculate_args(extra_params, params)
options = dict(self.run_command_fixed_options)
options['check_rc'] = options.get('check_rc', self.check_rc)
options.update(kwargs)
env_update = dict(options.get('environ_update', {}))
if self.force_lang:
env_update.update({
'LANGUAGE': self.force_lang,
'LC_ALL': self.force_lang,
})
self.update_output(force_lang=self.force_lang)
options['environ_update'] = env_update
rc, out, err = self.module.run_command(cmd_args, *args, **options)
if publish_rc:
self.update_output(rc=rc)
if publish_out:
self.update_output(stdout=out)
if publish_err:
self.update_output(stderr=err)
if publish_cmd:
self.update_output(cmd_args=cmd_args)
if process_output is None:
_process = self.process_command_output
else:
_process = process_output
return _process(rc, out, err)