# Copyright 2012-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.

#

# 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.

import sys

import signal

import logging

import botocore.session

from botocore import __version__ as botocore_version

from botocore.hooks import HierarchicalEmitter

from botocore import xform_name

from botocore.compat import copy_kwargs, OrderedDict

from botocore.exceptions import NoCredentialsError

from botocore.exceptions import NoRegionError

from awscli import EnvironmentVariables, __version__

from awscli.formatter import get_formatter

from awscli.plugin import load_plugins

from awscli.argparser import MainArgParser

from awscli.argparser import ServiceArgParser

from awscli.argparser import ArgTableArgParser

from awscli.argparser import USAGE

from awscli.help import ProviderHelpCommand

from awscli.help import ServiceHelpCommand

from awscli.help import OperationHelpCommand

from awscli.arguments import CustomArgument

from awscli.arguments import ListArgument

from awscli.arguments import BooleanArgument

from awscli.arguments import CLIArgument

from awscli.arguments import UnknownArgumentError

from awscli.argprocess import unpack_argument

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

LOG_FORMAT = (

'%(asctime)s - %(threadName)s - %(name)s - %(levelname)s - %(message)s')

def main():

driver = create_clidriver()

return driver.main()

def create_clidriver():

emitter = HierarchicalEmitter()

session = botocore.session.Session(EnvironmentVariables, emitter)

_set_user_agent_for_session(session)

load_plugins(session.full_config.get('plugins', {}),

event_hooks=emitter)

driver = CLIDriver(session=session)

return driver

def _set_user_agent_for_session(session):

session.user_agent_name = 'aws-cli'

session.user_agent_version = __version__

session.user_agent_extra = 'botocore/%s' % botocore_version

class CLIDriver(object):

def __init__(self, session=None):

if session is None:

self.session = botocore.session.get_session(EnvironmentVariables)

_set_user_agent_for_session(self.session)

else:

self.session = session

self._cli_data = None

self._command_table = None

self._argument_table = None

def _get_cli_data(self):

# Not crazy about this but the data in here is needed in

# several places (e.g. MainArgParser, ProviderHelp) so

# we load it here once.

if self._cli_data is None:

self._cli_data = self.session.get_data('cli')

return self._cli_data

def _get_command_table(self):

if self._command_table is None:

self._command_table = self._build_command_table()

return self._command_table

def _get_argument_table(self):

if self._argument_table is None:

self._argument_table = self._build_argument_table()

return self._argument_table

def _build_command_table(self):

"""

Create the main parser to handle the global arguments.

:rtype: ``argparser.ArgumentParser``

:return: The parser object

"""

command_table = self._build_builtin_commands(self.session)

self.session.emit('building-command-table.main',

command_table=command_table,

session=self.session,

command_object=self)

return command_table

def _build_builtin_commands(self, session):

commands = OrderedDict()

services = session.get_available_services()

for service_name in services:

commands[service_name] = ServiceCommand(cli_name=service_name,

session=self.session,

service_name=service_name)

return commands

def _build_argument_table(self):

argument_table = OrderedDict()

cli_data = self._get_cli_data()

cli_arguments = cli_data.get('options', None)

for option in cli_arguments:

option_params = copy_kwargs(cli_arguments[option])

cli_argument = self._create_cli_argument(option, option_params)

cli_argument.add_to_arg_table(argument_table)

# Then the final step is to send out an event so handlers

# can add extra arguments or modify existing arguments.

self.session.emit('building-top-level-params',

argument_table=argument_table)

return argument_table

def _create_cli_argument(self, option_name, option_params):

return CustomArgument(

option_name, help_text=option_params.get('help', ''),

dest=option_params.get('dest'),

default=option_params.get('default'),

action=option_params.get('action'),

required=option_params.get('required'),

choices=option_params.get('choices'),

cli_type_name=option_params.get('type'))

def create_help_command(self):

cli_data = self._get_cli_data()

return ProviderHelpCommand(self.session, self._get_command_table(),

self._get_argument_table(),

cli_data.get('description', None),

cli_data.get('synopsis', None),

cli_data.get('help_usage', None))

def _create_parser(self):

# Also add a 'help' command.

command_table = self._get_command_table()

command_table['help'] = self.create_help_command()

cli_data = self._get_cli_data()

parser = MainArgParser(

command_table, self.session.user_agent(),

cli_data.get('description', None),

self._get_argument_table())

return parser

def main(self, args=None):

"""

:param args: List of arguments, with the 'aws' removed. For example,

the command "aws s3 list-objects --bucket foo" will have an

args list of ``['s3', 'list-objects', '--bucket', 'foo']``.

"""

if args is None:

args = sys.argv[1:]

parser = self._create_parser()

command_table = self._get_command_table()

parsed_args, remaining = parser.parse_known_args(args)

try:

# Because _handle_top_level_args emits events, it's possible

# that exceptions can be raised, which should have the same

# general exception handling logic as calling into the

# command table. This is why it's in the try/except clause.

self._handle_top_level_args(parsed_args)

self._emit_session_event()

return command_table[parsed_args.command](remaining, parsed_args)

except UnknownArgumentError as e:

sys.stderr.write("usage: %s\n" % USAGE)

sys.stderr.write(str(e))

sys.stderr.write("\n")

return 255

except NoRegionError as e:

msg = ('%s You can also configure your region by running '

'"aws configure".' % e)

self._show_error(msg)

return 255

except NoCredentialsError as e:

msg = ('%s. You can configure credentials by running '

'"aws configure".' % e)

self._show_error(msg)

return 255

except KeyboardInterrupt:

# Shell standard for signals that terminate

# the process is to return 128 + signum, in this case

# SIGINT=2, so we'll have an RC of 130.

sys.stdout.write("\n")

return 128 + signal.SIGINT

except Exception as e:

LOG.debug("Exception caught in main()", exc_info=True)

LOG.debug("Exiting with rc 255")

sys.stderr.write("\n")

sys.stderr.write("%s\n" % e)

return 255

def _emit_session_event(self):

# This event is guaranteed to run after the session has been

# initialized and a profile has been set. This was previously

# problematic because if something in CLIDriver caused the

# session components to be reset (such as session.profile = foo)

# then all the prior registered components would be removed.

self.session.emit('session-initialized', session=self.session)

def _show_error(self, msg):

LOG.debug(msg, exc_info=True)

sys.stderr.write(msg)

sys.stderr.write('\n')

def _handle_top_level_args(self, args):

self.session.emit(

'top-level-args-parsed', parsed_args=args, session=self.session)

if args.profile:

self.session.set_config_variable('profile', args.profile)

if args.debug:

# TODO:

# Unfortunately, by setting debug mode here, we miss out

# on all of the debug events prior to this such as the

# loading of plugins, etc.

self.session.set_stream_logger('botocore', logging.DEBUG,

format_string=LOG_FORMAT)

self.session.set_stream_logger('awscli', logging.DEBUG,

format_string=LOG_FORMAT)

LOG.debug("CLI version: %s", self.session.user_agent())

LOG.debug("Arguments entered to CLI: %s", sys.argv[1:])

else:

self.session.set_stream_logger(logger_name='awscli',

log_level=logging.ERROR)

class CLICommand(object):

"""Interface for a CLI command.

This class represents a top level CLI command

(``aws ec2``, ``aws s3``, ``aws config``).

"""

@property

def name(self):

# Subclasses must implement a name.

raise NotImplementedError("name")

@name.setter

def name(self, value):

# Subclasses must implement setting/changing the cmd name.

raise NotImplementedError("name")

@property

def lineage(self):

# Represents how to get to a specific command using the CLI.

# It includes all commands that came before it and itself in

# a list.

return [self]

@property

def lineage_names(self):

# Represents the lineage of a command in terms of command ``name``

return [cmd.name for cmd in self.lineage]

def __call__(self, args, parsed_globals):

"""Invoke CLI operation.

:type args: str

:param args: The remaining command line args.

:type parsed_globals: ``argparse.Namespace``

:param parsed_globals: The parsed arguments so far.

:rtype: int

:return: The return code of the operation. This will be used

as the RC code for the ``aws`` process.

"""

# Subclasses are expected to implement this method.

pass

def create_help_command(self):

# Subclasses are expected to implement this method if they want

# help docs.

return None

@property

def arg_table(self):

return {}

class ServiceCommand(CLICommand):

"""A service command for the CLI.

For example, ``aws ec2 ...`` we'd create a ServiceCommand

object that represents the ec2 service.

"""

def __init__(self, cli_name, session, service_name=None):

# The cli_name is the name the user types, the name we show

# in doc, etc.

# The service_name is the name we used internally with botocore.

# For example, we have the 's3api' as the cli_name for the service

# but this is actually bound to the 's3' service name in botocore,

# i.e. we load s3.json from the botocore data dir. Most of

# the time these are the same thing but in the case of renames,

# we want users/external things to be able to rename the cli name

# but *not* the service name, as this has to be exactly what

# botocore expects.

self._name = cli_name

self.session = session

self._command_table = None

if service_name is None:

# Then default to using the cli name.

self._service_name = cli_name

else:

self._service_name = service_name

self._lineage = [self]

self._service_model = None

@property

def name(self):

return self._name

@name.setter

def name(self, value):

self._name = value

@property

def service_model(self):

return self._get_service_model()

@property

def lineage(self):

return self._lineage

@lineage.setter

def lineage(self, value):

self._lineage = value

def _get_command_table(self):

if self._command_table is None:

self._command_table = self._create_command_table()

return self._command_table

def _get_service_model(self):

if self._service_model is None:

api_version = self.session.get_config_variable('api_versions').get(

self._service_name, None)

self._service_model = self.session.get_service_model(

self._service_name, api_version=api_version)

return self._service_model

def __call__(self, args, parsed_globals):

# Once we know we're trying to call a service for this operation

# we can go ahead and create the parser for it. We

# can also grab the Service object from botocore.

service_parser = self._create_parser()

parsed_args, remaining = service_parser.parse_known_args(args)

command_table = self._get_command_table()

return command_table[parsed_args.operation](remaining, parsed_globals)

def _create_command_table(self):

command_table = OrderedDict()

service_model = self._get_service_model()

for operation_name in service_model.operation_names:

cli_name = xform_name(operation_name, '-')

operation_model = service_model.operation_model(operation_name)

command_table[cli_name] = ServiceOperation(

name=cli_name,

parent_name=self._name,

session=self.session,

operation_model=operation_model,

operation_caller=CLIOperationCaller(self.session),

)

self.session.emit('building-command-table.%s' % self._name,

command_table=command_table,

session=self.session,

command_object=self)

self._add_lineage(command_table)

return command_table

def _add_lineage(self, command_table):

for command in command_table:

command_obj = command_table[command]

command_obj.lineage = self.lineage + [command_obj]

def create_help_command(self):

command_table = self._get_command_table()

return ServiceHelpCommand(session=self.session,

obj=self._get_service_model(),

command_table=command_table,

arg_table=None,

event_class='.'.join(self.lineage_names),

name=self._name)

def _create_parser(self):

command_table = self._get_command_table()

# Also add a 'help' command.

command_table['help'] = self.create_help_command()

return ServiceArgParser(

operations_table=command_table, service_name=self._name)

class ServiceOperation(object):

"""A single operation of a service.

This class represents a single operation for a service, for

example ``ec2.DescribeInstances``.

"""

ARG_TYPES = {

'list': ListArgument,

'boolean': BooleanArgument,

}

DEFAULT_ARG_CLASS = CLIArgument

def __init__(self, name, parent_name, operation_caller,

operation_model, session):

"""

:type name: str

:param name: The name of the operation/subcommand.

:type parent_name: str

:param parent_name: The name of the parent command.

:type operation_model: ``botocore.model.OperationModel``

:param operation_object: The operation model

associated with this subcommand.

:type operation_caller: ``CLIOperationCaller``

:param operation_caller: An object that can properly call the

operation.

:type session: ``botocore.session.Session``

:param session: The session object.

"""

self._arg_table = None

self._name = name

# These is used so we can figure out what the proper event

# name should be <parent name>.<name>.

self._parent_name = parent_name

self._operation_caller = operation_caller

self._lineage = [self]

self._operation_model = operation_model

self._session = session

@property

def name(self):

return self._name

@name.setter

def name(self, value):

self._name = value

@property

def lineage(self):

return self._lineage

@lineage.setter

def lineage(self, value):

self._lineage = value

@property

def lineage_names(self):

# Represents the lineage of a command in terms of command ``name``

return [cmd.name for cmd in self.lineage]

@property

def arg_table(self):

if self._arg_table is None:

self._arg_table = self._create_argument_table()

return self._arg_table

def __call__(self, args, parsed_globals):

# Once we know we're trying to call a particular operation

# of a service we can go ahead and load the parameters.

event = 'before-building-argument-table-parser.%s.%s' % \

(self._parent_name, self._name)

self._emit(event, argument_table=self.arg_table, args=args,

session=self._session)

operation_parser = self._create_operation_parser(self.arg_table)

self._add_help(operation_parser)

parsed_args, remaining = operation_parser.parse_known_args(args)

if parsed_args.help == 'help':

op_help = self.create_help_command()

return op_help(remaining, parsed_globals)

elif parsed_args.help:

remaining.append(parsed_args.help)

if remaining:

raise UnknownArgumentError(

"Unknown options: %s" % ', '.join(remaining))

event = 'operation-args-parsed.%s.%s' % (self._parent_name,

self._name)

self._emit(event, parsed_args=parsed_args,

parsed_globals=parsed_globals)

call_parameters = self._build_call_parameters(

parsed_args, self.arg_table)

event = 'calling-command.%s.%s' % (self._parent_name,

self._name)

override = self._emit_first_non_none_response(

event,

call_parameters=call_parameters,

parsed_args=parsed_args,

parsed_globals=parsed_globals

)

# There are two possible values for override. It can be some type

# of exception that will be raised if detected or it can represent

# the desired return code. Note that a return code of 0 represents

# a success.

if override is not None:

if isinstance(override, Exception):

# If the override value provided back is an exception then

# raise the exception

raise override

else:

# This is the value usually returned by the ``invoke()``

# method of the operation caller. It represents the return

# code of the operation.

return override

else:

# No override value was supplied.

return self._operation_caller.invoke(

self._operation_model.service_model.service_name,

self._operation_model.name,

call_parameters, parsed_globals)

def create_help_command(self):

return OperationHelpCommand(

self._session,

operation_model=self._operation_model,

arg_table=self.arg_table,

name=self._name, event_class='.'.join(self.lineage_names))

def _add_help(self, parser):

# The 'help' output is processed a little differently from

# the operation help because the arg_table has

# CLIArguments for values.

parser.add_argument('help', nargs='?')

def _build_call_parameters(self, args, arg_table):

# We need to convert the args specified on the command

# line as valid **kwargs we can hand to botocore.

service_params = {}

# args is an argparse.Namespace object so we're using vars()

# so we can iterate over the parsed key/values.

parsed_args = vars(args)

for arg_object in arg_table.values():

py_name = arg_object.py_name

if py_name in parsed_args:

value = parsed_args[py_name]

value = self._unpack_arg(arg_object, value)

arg_object.add_to_params(service_params, value)

return service_params

def _unpack_arg(self, cli_argument, value):

# Unpacks a commandline argument into a Python value by firing the

# load-cli-arg.service-name.operation-name event.

session = self._session

service_name = self._operation_model.service_model.endpoint_prefix

operation_name = xform_name(self._name, '-')

return unpack_argument(session, service_name, operation_name,

cli_argument, value)

def _create_argument_table(self):

argument_table = OrderedDict()

input_shape = self._operation_model.input_shape

required_arguments = []

arg_dict = {}

if input_shape is not None:

required_arguments = input_shape.required_members

arg_dict = input_shape.members

for arg_name, arg_shape in arg_dict.items():

cli_arg_name = xform_name(arg_name, '-')

arg_class = self.ARG_TYPES.get(arg_shape.type_name,

self.DEFAULT_ARG_CLASS)

is_required = arg_name in required_arguments

event_emitter = self._session.get_component('event_emitter')

arg_object = arg_class(

name=cli_arg_name,

argument_model=arg_shape,

is_required=is_required,

operation_model=self._operation_model,

serialized_name=arg_name,

event_emitter=event_emitter)

arg_object.add_to_arg_table(argument_table)

LOG.debug(argument_table)

self._emit('building-argument-table.%s.%s' % (self._parent_name,

self._name),

operation_model=self._operation_model,

session=self._session,

command=self,

argument_table=argument_table)

return argument_table

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

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

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

return self._session.emit_first_non_none_response(

name, **kwargs)

def _create_operation_parser(self, arg_table):

parser = ArgTableArgParser(arg_table)

return parser

class CLIOperationCaller(object):

"""Call an AWS operation and format the response."""

def __init__(self, session):

self._session = session

def invoke(self, service_name, operation_name, parameters, parsed_globals):

"""Invoke an operation and format the response.

:type service_name: str

:param service_name: The name of the service. Note this is the service name,

not the endpoint prefix (e.g. ``ses`` not ``email``).

:type operation_name: str

:param operation_name: The operation name of the service. The casing

of the operation name should match the exact casing used by the service,

e.g. ``DescribeInstances``, not ``describe-instances`` or

``describe_instances``.

:type parameters: dict

:param parameters: The parameters for the operation call. Again, these values

have the same casing used by the service.

:type parsed_globals: Namespace

:param parsed_globals: The parsed globals from the command line.

:return: None, the result is displayed through a formatter, but no

value is returned.

"""

client = self._session.create_client(

service_name, region_name=parsed_globals.region,

endpoint_url=parsed_globals.endpoint_url,

verify=parsed_globals.verify_ssl)

py_operation_name = xform_name(operation_name)

if client.can_paginate(py_operation_name) and parsed_globals.paginate:

paginator = client.get_paginator(py_operation_name)

response = paginator.paginate(**parameters)

else:

response = getattr(client, xform_name(operation_name))(

**parameters)

self._display_response(operation_name, response, parsed_globals)

return 0

def _display_response(self, command_name, response,

parsed_globals):

output = parsed_globals.output

if output is None:

output = self._session.get_config_variable('output')

formatter = get_formatter(output, parsed_globals)

formatter(command_name, response)