aws-cli/awscli/argprocess.py at develop · OneTouchMedia/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.

"""Module for processing CLI args."""

import os

import json

import logging

import six

from awscli import utils

from awscli import SCALAR_TYPES, COMPLEX_TYPES

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

class ParamError(Exception):

def __init__(self, param, message):

full_message = ("Error parsing parameter %s, should be: %s" %

(param.cli_name, message))

super(ParamError, self).__init__(full_message)

self.param = param

class ParamSyntaxError(Exception):

pass

class ParamUnknownKeyError(Exception):

def __init__(self, param, key, valid_keys):

valid_keys = ', '.join(valid_keys)

full_message = (

"Unknown key '%s' for parameter %s, valid choices "

"are: %s" % (key, param.cli_name, valid_keys))

super(ParamUnknownKeyError, self).__init__(full_message)

def detect_shape_structure(param):

if param.type in SCALAR_TYPES:

return 'scalar'

elif param.type == 'structure':

sub_types = [detect_shape_structure(p)

for p in param.members]

# We're distinguishing between structure(scalar)

# and structure(scalars), because for the case of

# a single scalar in a structure we can simplify

# more than a structure(scalars).

if len(sub_types) == 1 and all(p == 'scalar' for p in sub_types):

return 'structure(scalar)'

elif len(sub_types) > 1 and all(p == 'scalar' for p in sub_types):

return 'structure(scalars)'

else:

return 'structure(%s)' % ', '.join(sorted(set(sub_types)))

elif param.type == 'list':

return 'list-%s' % detect_shape_structure(param.members)

elif param.type == 'map':

if param.members.type in SCALAR_TYPES:

return 'map-scalar'

else:

return 'map-%s' % detect_shape_structure(param.members)

class ParamShorthand(object):

# To add support for a new shape:

# * Add it to SHORTHAND_SHAPES below, key is the shape structure

# value is the name of the method to call.

# * Implement parse method.

# * Implement _doc_<parse_method_name>. This is used to generate

# the docs for this shorthand syntax.

SHORTHAND_SHAPES = {

'structure(scalars)': '_key_value_parse',

'structure(scalar)': '_special_key_value_parse',

'map-scalar': '_key_value_parse',

'list-structure(scalar)': '_list_scalar_parse',

'list-structure(scalars)': '_list_key_value_parse',

'list-structure(list-scalar, scalar)': '_list_scalar_list_parse',

}

def __init__(self):

pass

def __call__(self, param, value, **kwargs):

"""Attempt to parse shorthand syntax for values.

This is intended to be hooked up as an event handler (hence the

**kwargs). Given ``param`` object and its string ``value``,

figure out if we can parse it. If we can parse it, we return

the parsed value (typically some sort of python dict).

:type param: :class:`botocore.parameters.Parameter`

:param param: The parameter object (includes various metadata

about the parameter).

:type value: str

:param value: The value for the parameter type on the command

line, e.g ``--foo this_value``, value would be ``"this_value"``.

:returns: If we can parse the value we return the parsed value.

If it looks like JSON, we return None (which tells the event

emitter to use the default ``unpack_cli_arg`` provided that

no other event handlers can parsed the value). If we

run into an error parsing the value, a ``ParamError`` will

be raised.

"""

parse_method = self.get_parse_method_for_param(param, value)

if parse_method is None:

return

else:

try:

LOG.debug("Using %s for param %s", parse_method, param)

parsed = getattr(self, parse_method)(param, value)

except ParamSyntaxError as e:

doc_fn = self._get_example_fn(param)

# Try to give them a helpful error message.

if doc_fn is None:

raise e

else:

raise ParamError(param, doc_fn(param))

return parsed

def get_parse_method_for_param(self, param, value=None):

# We first need to make sure this is a parameter that qualifies

# for simplification. The first short-circuit case is if it looks

# like json we immediately return.

if isinstance(value, list):

check_val = value[0]

else:

check_val = value

if isinstance(check_val, str) and check_val.startswith(('[', '{')):

LOG.debug("Param %s looks like JSON, not considered for "

"param shorthand.", param.py_name)

return

structure = detect_shape_structure(param)

parse_method = self.SHORTHAND_SHAPES.get(structure)

return parse_method

def _get_example_fn(self, param):

doc_fn = None

shape_structure = detect_shape_structure(param)

method = self.SHORTHAND_SHAPES.get(shape_structure)

if method:

doc_fn = getattr(self, '_docs' + method, None)

return doc_fn

def add_example_fn(self, arg_name, help_command, **kwargs):

"""

Adds a callable to the ``example_fn`` attribute of the parameter

if the parameter type is supported by shorthand syntax. This

callable should return a string containing just the example and

not any of the ReST formatting that might be required in the docs.

"""

argument = help_command.arg_table[arg_name]

if hasattr(argument, 'argument_object') and argument.argument_object:

param = argument.argument_object

LOG.debug('Adding example fn for: %s' % param.name)

doc_fn = self._get_example_fn(param)

param.example_fn = doc_fn

def _list_scalar_list_parse(self, param, value):

# Think something like ec2.DescribeInstances.Filters.

# We're looking for key=val1,val2,val3,key2=val1,val2.

arg_types = {}

for arg in param.members.members:

arg_types[arg.name] = arg.type

parsed = []

for v in value:

parts = self._split_on_commas(v)

current_parsed = {}

current_key = None

for part in parts:

current = part.split('=', 1)

if len(current) == 2:

# This is a key/value pair.

current_key = current[0].strip()

current_value = current[1].strip()

if current_key not in arg_types:

raise ParamUnknownKeyError(param, current_key,

arg_types.keys())

elif arg_types[current_key] == 'list':

current_parsed[current_key] = [current_value]

else:

current_parsed[current_key] = current_value

elif current_key is not None:

# This is a value which we associate with the current_key,

# so key1=val1,val2

# ^

# |

# val2 is associated with key1.

current_parsed[current_key].append(current[0])

else:

raise ParamSyntaxError(part)

parsed.append(current_parsed)

return parsed

def _list_scalar_parse(self, param, value):

single_param = param.members.members[0]

parsed = []

# We know that value is a list in this case.

for v in value:

parsed.append({single_param.name: v})

return parsed

def _list_key_value_parse(self, param, value):

# param is a list param.

# param.member is the struct param.

struct_param = param.members

parsed = []

for v in value:

single_struct_param = self._key_value_parse(struct_param, v)

parsed.append(single_struct_param)

return parsed

def _special_key_value_parse(self, param, value):

# This is a special key value parse that can do the normal

# key=value parsing, *but* supports a few additional conveniences

# when working with a structure with a single element.

# Precondition: param is a shape of structure(scalar)

if len(param.members) == 1 and param.members[0].name == 'Value' and \

'=' not in value:

# We have an even shorter shorthand syntax for structure

# of scalars of a single element with a member name of

# 'Value'.

return {'Value': value}

else:

return self._key_value_parse(param, value)

def _key_value_parse(self, param, value):

# The expected structure is:

# key=value,key2=value

# that is, csv key value pairs, where the key and values

# are separated by '='. All of this should be whitespace

# insensitive.

parsed = {}

parts = self._split_on_commas(value)

valid_names = self._create_name_to_params(param)

for part in parts:

try:

key, value = part.split('=', 1)

except ValueError:

raise ParamSyntaxError(part)

key = key.strip()

value = value.strip()

if key not in valid_names:

raise ParamUnknownKeyError(param, key, valid_names)

sub_param = valid_names[key]

if sub_param is not None:

value = unpack_scalar_cli_arg(sub_param, value)

parsed[key] = value

return parsed

def _create_name_to_params(self, param):

if param.type == 'structure':

return dict([(p.name, p) for p in param.members])

elif param.type == 'map':

return dict([(v, None) for v in param.keys.enum])

def _docs_list_scalar_list_parse(self, param):

s = 'Key value pairs, where values are separated by commas.\n'

s += '%s ' % param.cli_name

inner_params = param.members.members

scalar_params = [p for p in inner_params if p.type in SCALAR_TYPES]

list_params = [p for p in inner_params if p.type == 'list']

for param in scalar_params:

s += '%s=%s1,' % (param.name, param.type)

for param in list_params[:-1]:

param_type = param.members.type

s += '%s=%s1,%s2,' % (param.name, param_type, param_type)

last_param = list_params[-1]

param_type = last_param.members.type

s += '%s=%s1,%s2' % (last_param.name, param_type, param_type)

return s

def _docs_list_scalar_parse(self, param):

name = param.members.members[0].name

return '%s %s1 %s2 %s3' % (param.cli_name, name, name, name)

def _docs_list_key_value_parse(self, param):

s = "Key value pairs, with multiple values separated by a space.\n"

s += '%s ' % param.cli_name

s += ','.join(['%s=%s' % (sub_param.name, sub_param.type)

for sub_param in param.members.members])

return s

def _docs_special_key_value_parse(self, param):

if len(param.members) == 1 and param.members[0].name == 'Value':

# Returning None will indicate that we don't have

# any examples to generate, and the entire examples section

# should be skipped for this arg.

return None

else:

self._docs_key_value_parse(param)

def _docs_key_value_parse(self, param):

s = '%s ' % param.cli_name

if param.type == 'structure':

s += ','.join(['%s=value' % sub_param.name

for sub_param in param.members])

elif param.type == 'map':

s += 'key_name=string,key_name2=string'

if param.keys.type == 'string' and hasattr(param.keys, 'enum'):

s += '\nWhere valid key names are:\n'

for value in param.keys.enum:

s += ' %s\n' % value

return s

def _split_on_commas(self, value):

try:

return utils.split_on_commas(value)

except ValueError as e:

raise ParamSyntaxError(str(e))

def unpack_cli_arg(parameter, value):

"""

Parses and unpacks the encoded string command line parameter

and returns native Python data structures that can be passed

to the Operation.

:type parameter: :class:`botocore.parameter.Parameter`

:param parameter: The parameter object containing metadata about

the parameter.

:param value: The value of the parameter. This can be a number of

different python types (str, list, etc). This is the value as

it's specified on the command line.

:return: The "unpacked" argument than can be sent to the `Operation`

object in python.

"""

if parameter.type in SCALAR_TYPES:

return unpack_scalar_cli_arg(parameter, value)

elif parameter.type in COMPLEX_TYPES:

return unpack_complex_cli_arg(parameter, value)

else:

return str(value)

def unpack_complex_cli_arg(parameter, value):

if parameter.type == 'structure' or parameter.type == 'map':

if value.lstrip()[0] == '{':

d = json.loads(value)

else:

msg = 'The value for parameter "%s" must be JSON or path to file.' % (

parameter.cli_name)

raise ValueError(msg)

return d

elif parameter.type == 'list':

if isinstance(value, six.string_types):

if value.lstrip()[0] == '[':

return json.loads(value)

elif isinstance(value, list) and len(value) == 1:

single_value = value[0].strip()

if single_value and single_value[0] == '[':

return json.loads(value[0])

return [unpack_cli_arg(parameter.members, v) for v in value]

def unpack_scalar_cli_arg(parameter, value):

if parameter.type == 'integer' or parameter.type == 'long':

return int(value)

elif parameter.type == 'float' or parameter.type == 'double':

# TODO: losing precision on double types

return float(value)

elif parameter.type == 'blob' and parameter.payload and parameter.streaming:

file_path = os.path.expandvars(value)

file_path = os.path.expanduser(file_path)

if not os.path.isfile(file_path):

msg = 'Blob values must be a path to a file.'

raise ValueError(msg)

return open(file_path, 'rb')

elif parameter.type == 'boolean':

if isinstance(value, str) and value.lower() == 'false':

return False

return bool(value)

else:

return str(value)

aws-cli/awscli/argprocess.py at develop · OneTouchMedia/aws-cli · GitHub

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