aws-cli/awscli/arguments.py at develop · ProGamerCode/aws-cli · GitHub

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# Licensed under the Apache License, Version 2.0 (the "License"). You

# may not use this file except in compliance with the License. A copy of

# the License is located at

# http://aws.amazon.com/apache2.0/

# or in the "license" file accompanying this file. This file is

# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF

# ANY KIND, either express or implied. See the License for the specific

# language governing permissions and limitations under the License.

"""Abstractions for CLI arguments.

This module contains abstractions for representing CLI arguments.

This includes how the CLI argument parser is created, how arguments

are serialized, and how arguments are bound (if at all) to operation

arguments.

The BaseCLIArgument is the interface for all arguments. This is the interface

expected by objects that work with arguments. If you want to implement your

own argument subclass, make sure it implements everything in BaseCLIArgument.

Arguments generally fall into one of several categories:

* global argument. These arguments may influence what the CLI does,

but aren't part of the input parameters needed to make an API call. For

example, the ``--region`` argument specifies which region to send the request

to. The ``--output`` argument specifies how to display the response to the

user. The ``--query`` argument specifies how to select specific elements

from a response.

* operation argument. These are arguments that influence the parameters we

send to a service when making an API call. Some of these arguments are

automatically created directly from introspecting the JSON service model.

Sometimes customizations may provide a pseudo-argument that takes the

user input and maps the input value to several API parameters.

"""

import logging

from botocore import xform_name

from botocore.hooks import first_non_none_response

from awscli.argprocess import unpack_cli_arg

from awscli.schema import SchemaTransformer

from botocore import model

LOG = logging.getLogger('awscli.arguments')

class UnknownArgumentError(Exception):

pass

def create_argument_model_from_schema(schema):

# Given a JSON schems (described in schema.py), convert it

# to a shape object from `botocore.model.Shape` that can be

# used as the argument_model for the Argument classes below.

transformer = SchemaTransformer()

shapes_map = transformer.transform(schema)

shape_resolver = model.ShapeResolver(shapes_map)

# The SchemaTransformer guarantees that the top level shape

# will always be named 'InputShape'.

arg_shape = shape_resolver.get_shape_by_name('InputShape')

return arg_shape

class BaseCLIArgument(object):

"""Interface for CLI argument.

This class represents the interface used for representing CLI

arguments.

"""

def __init__(self, name):

self._name = name

def add_to_arg_table(self, argument_table):

"""Add this object to the argument_table.

The ``argument_table`` represents the argument for the operation.

This is called by the ``ServiceOperation`` object to create the

arguments associated with the operation.

:type argument_table: dict

:param argument_table: The argument table. The key is the argument

name, and the value is an object implementing this interface.

"""

argument_table[self.name] = self

def add_to_parser(self, parser):

"""Add this object to the parser instance.

This method is called by the associated ``ArgumentParser``

instance. This method should make the relevant calls

to ``add_argument`` to add itself to the argparser.

:type parser: ``argparse.ArgumentParser``.

:param parser: The argument parser associated with the operation.

"""

pass

def add_to_params(self, parameters, value):

"""Add this object to the parameters dict.

This method is responsible for taking the value specified

on the command line, and deciding how that corresponds to

parameters used by the service/operation.

:type parameters: dict

:param parameters: The parameters dictionary that will be

given to ``botocore``. This should match up to the

parameters associated with the particular operation.

:param value: The value associated with the CLI option.

"""

pass

@property

def name(self):

return self._name

@property

def cli_name(self):

return '--' + self._name

@property

def cli_type_name(self):

raise NotImplementedError("cli_type_name")

@property

def required(self):

raise NotImplementedError("required")

@property

def documentation(self):

raise NotImplementedError("documentation")

@property

def cli_type(self):

raise NotImplementedError("cli_type")

@property

def py_name(self):

return self._name.replace('-', '_')

@property

def choices(self):

"""List valid choices for argument value.

If this value is not None then this should return a list of valid

values for the argument.

"""

return None

@property

def synopsis(self):

return ''

@property

def positional_arg(self):

return False

@property

def nargs(self):

return None

@name.setter

def name(self, value):

self._name = value

@property

def group_name(self):

"""Get the group name associated with the argument.

An argument can be part of a group. This property will

return the name of that group.

This base class has no default behavior for groups, code

that consumes argument objects can use them for whatever

purposes they like (documentation, mutually exclusive group

validation, etc.).

"""

return None

class CustomArgument(BaseCLIArgument):

"""

Represents a CLI argument that is configured from a dictionary.

For example, the "top level" arguments used for the CLI

(--region, --output) can use a CustomArgument argument,

as these are described in the cli.json file as dictionaries.

This class is also useful for plugins/customizations that want to

add additional args.

"""

def __init__(self, name, help_text='', dest=None, default=None,

action=None, required=None, choices=None, nargs=None,

cli_type_name=None, group_name=None, positional_arg=False,

no_paramfile=False, argument_model=None, synopsis='',

const=None):

self._name = name

self._help = help_text

self._dest = dest

self._default = default

self._action = action

self._required = required

self._nargs = nargs

self._const = const

self._cli_type_name = cli_type_name

self._group_name = group_name

self._positional_arg = positional_arg

if choices is None:

choices = []

self._choices = choices

self._synopsis = synopsis

# These are public attributes that are ok to access from external

# objects.

self.no_paramfile = no_paramfile

self.argument_model = None

if argument_model is None:

argument_model = self._create_scalar_argument_model()

self.argument_model = argument_model

# If the top level element is a list then set nargs to

# accept multiple values seperated by a space.

if self.argument_model is not None and \

self.argument_model.type_name == 'list':

self._nargs = '+'

def _create_scalar_argument_model(self):

if self._nargs is not None:

# If nargs is not None then argparse will parse the value

# as a list, so we don't create an argument_object so we don't

# go through param validation.

return None

# If no argument model is provided, we create a basic

# shape argument.

type_name = self.cli_type_name

return create_argument_model_from_schema({'type': type_name})

@property

def cli_name(self):

if self._positional_arg:

return self._name

else:

return '--' + self._name

def add_to_parser(self, parser):

"""

See the ``BaseCLIArgument.add_to_parser`` docs for more information.

"""

cli_name = self.cli_name

kwargs = {}

if self._dest is not None:

kwargs['dest'] = self._dest

if self._action is not None:

kwargs['action'] = self._action

if self._default is not None:

kwargs['default'] = self._default

if self._choices:

kwargs['choices'] = self._choices

if self._required is not None:

kwargs['required'] = self._required

if self._nargs is not None:

kwargs['nargs'] = self._nargs

if self._const is not None:

kwargs['const'] = self._const

parser.add_argument(cli_name, **kwargs)

@property

def required(self):

if self._required is None:

return False

return self._required

@required.setter

def required(self, value):

self._required = value

@property

def documentation(self):

return self._help

@property

def cli_type_name(self):

if self._cli_type_name is not None:

return self._cli_type_name

elif self._action in ['store_true', 'store_false']:

return 'boolean'

elif self.argument_model is not None:

return self.argument_model.type_name

else:

# Default to 'string' type if we don't have any

# other info.

return 'string'

@property

def cli_type(self):

cli_type = str

if self._action in ['store_true', 'store_false']:

cli_type = bool

return cli_type

@property

def choices(self):

return self._choices

@property

def group_name(self):

return self._group_name

@property

def synopsis(self):

return self._synopsis

@property

def positional_arg(self):

return self._positional_arg

@property

def nargs(self):

return self._nargs

class CLIArgument(BaseCLIArgument):

"""Represents a CLI argument that maps to a service parameter.

"""

TYPE_MAP = {

'structure': str,

'map': str,

'timestamp': str,

'list': str,

'string': str,

'float': float,

'integer': str,

'long': int,

'boolean': bool,

'double': float,

'blob': str

}

def __init__(self, name, argument_model, operation_model,

event_emitter, is_required=False,

serialized_name=None):

"""

:type name: str

:param name: The name of the argument in "cli" form

(e.g. ``min-instances``).

:type argument_model: ``botocore.model.Shape``

:param argument_model: The shape object that models the argument.

:type argument_model: ``botocore.model.OperationModel``

:param argument_model: The object that models the associated operation.

:type event_emitter: ``botocore.hooks.BaseEventHooks``

:param event_emitter: The event emitter to use when emitting events.

This class will emit events during parts of the argument

parsing process. This event emitter is what is used to emit

such events.

:type is_required: boolean

:param is_required: Indicates if this parameter is required or not.

"""

self._name = name

# This is the name we need to use when constructing the parameters

# dict we send to botocore. While we can change the .name attribute

# which is the name exposed in the CLI, the serialized name we use

# for botocore is invariant and should not be changed.

if serialized_name is None:

serialized_name = name

self._serialized_name = serialized_name

self.argument_model = argument_model

self._required = is_required

self._operation_model = operation_model

self._event_emitter = event_emitter

self._documentation = argument_model.documentation

@property

def py_name(self):

return self._name.replace('-', '_')

@property

def required(self):

return self._required

@required.setter

def required(self, value):

self._required = value

@property

def documentation(self):

return self._documentation

@documentation.setter

def documentation(self, value):

self._documentation = value

@property

def cli_type_name(self):

return self.argument_model.type_name

@property

def cli_type(self):

return self.TYPE_MAP.get(self.argument_model.type_name, str)

def add_to_parser(self, parser):

"""

See the ``BaseCLIArgument.add_to_parser`` docs for more information.

"""

cli_name = self.cli_name

parser.add_argument(

cli_name,

help=self.documentation,

type=self.cli_type,

required=self.required)

def add_to_params(self, parameters, value):

if value is None:

return

else:

# This is a two step process. First is the process of converting

# the command line value into a python value. Normally this is

# handled by argparse directly, but there are cases where extra

# processing is needed. For example, "--foo name=value" the value

# can be converted from "name=value" to {"name": "value"}. This is

# referred to as the "unpacking" process. Once we've unpacked the

# argument value, we have to decide how this is converted into

# something that can be consumed by botocore. Many times this is

# just associating the key and value in the params dict as down

# below. Sometimes this can be more complicated, and subclasses

# can customize as they need.

unpacked = self._unpack_argument(value)

LOG.debug('Unpacked value of %r for parameter "%s": %r', value,

self.py_name, unpacked)

parameters[self._serialized_name] = unpacked

def _unpack_argument(self, value):

service_name = self._operation_model.service_model.service_name

operation_name = xform_name(self._operation_model.name, '-')

override = self._emit_first_response('process-cli-arg.%s.%s' % (

service_name, operation_name), param=self.argument_model,

cli_argument=self, value=value)

if override is not None:

# A plugin supplied an alternate conversion,

# use it instead.

return override

else:

# Fall back to the default arg processing.

return unpack_cli_arg(self, value)

def _emit(self, name, **kwargs):

return self._event_emitter.emit(name, **kwargs)

def _emit_first_response(self, name, **kwargs):

responses = self._emit(name, **kwargs)

return first_non_none_response(responses)

class ListArgument(CLIArgument):

def add_to_parser(self, parser):

cli_name = self.cli_name

parser.add_argument(cli_name,

nargs='*',

type=self.cli_type,

required=self.required)

class BooleanArgument(CLIArgument):

"""Represent a boolean CLI argument.

A boolean parameter is specified without a value::

aws foo bar --enabled

For cases wher the boolean parameter is required we need to add

two parameters::

aws foo bar --enabled

aws foo bar --no-enabled

We use the capabilities of the CLIArgument to help achieve this.

"""

def __init__(self, name, argument_model, operation_model,

event_emitter,

is_required=False, action='store_true', dest=None,

group_name=None, default=None,

serialized_name=None):

super(BooleanArgument, self).__init__(name,

argument_model,

operation_model,

event_emitter,

is_required,

serialized_name=serialized_name)

self._mutex_group = None

self._action = action

if dest is None:

self._destination = self.py_name

else:

self._destination = dest

if group_name is None:

self._group_name = self.name

else:

self._group_name = group_name

self._default = default

def add_to_params(self, parameters, value):

# If a value was explicitly specified (so value is True/False

# but *not* None) then we add it to the params dict.

# If the value was not explicitly set (value is None)

# we don't add it to the params dict.

if value is not None:

parameters[self._serialized_name] = value

def add_to_arg_table(self, argument_table):

# Boolean parameters are a bit tricky. For a single boolean parameter

# we actually want two CLI params, a --foo, and a --no-foo. To do this

# we need to add two entries to the argument table. So we can add

# ourself as the positive option (--no), and then create a clone of

# ourselves for the negative service. We then insert both into the

# arg table.

argument_table[self.name] = self

negative_name = 'no-%s' % self.name

negative_version = self.__class__(

negative_name, self.argument_model,

self._operation_model, self._event_emitter,

action='store_false', dest=self._destination,

group_name=self.group_name, serialized_name=self._serialized_name)

argument_table[negative_name] = negative_version

def add_to_parser(self, parser):

parser.add_argument(self.cli_name,

help=self.documentation,

action=self._action,

default=self._default,

dest=self._destination)

@property

def group_name(self):

return self._group_name

aws-cli/awscli/arguments.py at develop · ProGamerCode/aws-cli · GitHub

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