Synnefo » ./kamaki

# Copyright 2012-2013 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.command

import logging

from sys import argv, exit, stdout

from os.path import basename, exists

from inspect import getargspec

from kamaki.cli.argument import ArgumentParseManager

from kamaki.cli.history import History

from kamaki.cli.utils import print_dict, red, magenta, yellow

from kamaki.cli.errors import CLIError, CLICmdSpecError

from kamaki.cli import logger

from kamaki.clients.astakos import AstakosClient as AuthCachedClient

from kamaki.clients import ClientError

_help = False

_debug = False

_include = False

_verbose = False

_colors = False

kloger = None

filelog = None

#  command auxiliary methods

_best_match = []

def _arg2syntax(arg):

    return arg.replace(

        '____', '[:').replace(

            '___', ':').replace(

                '__', ']').replace(

                    '_', ' ')

def _construct_command_syntax(cls):

        spec = getargspec(cls.main.im_func)

        args = spec.args[1:]

        n = len(args) - len(spec.defaults or ())

        required = ' '.join(['<%s>' % _arg2syntax(x) for x in args[:n]])

        optional = ' '.join(['[%s]' % _arg2syntax(x) for x in args[n:]])

        cls.syntax = ' '.join(x for x in [required, optional] if x)

        if spec.varargs:

            cls.syntax += ' <%s ...>' % spec.varargs

def _num_of_matching_terms(basic_list, attack_list):

    if not attack_list:

        return len(basic_list)

    matching_terms = 0

    for i, term in enumerate(basic_list):

        try:

            if term != attack_list[i]:

                break

        except IndexError:

            break

        matching_terms += 1

    return matching_terms

def _update_best_match(name_terms, prefix=[]):

    if prefix:

        pref_list = prefix if isinstance(prefix, list) else prefix.split('_')

    else:

        pref_list = []

    num_of_matching_terms = _num_of_matching_terms(name_terms, pref_list)

    global _best_match

    if not prefix:

        _best_match = []

    if num_of_matching_terms and len(_best_match) <= num_of_matching_terms:

        if len(_best_match) < num_of_matching_terms:

            _best_match = name_terms[:num_of_matching_terms]

        return True

    return False

def command(cmd_tree, prefix='', descedants_depth=1):

    """Load a class as a command

        e.g. spec_cmd0_cmd1 will be command spec cmd0

        :param cmd_tree: is initialized in cmd_spec file and is the structure

            where commands are loaded. Var name should be _commands

        :param prefix: if given, load only commands prefixed with prefix,

        :param descedants_depth: is the depth of the tree descedants of the

            prefix command. It is used ONLY if prefix and if prefix is not

            a terminal command

        :returns: the specified class object

    """

    def wrap(cls):

        global kloger

        cls_name = cls.__name__

        if not cmd_tree:

            if _debug:

                kloger.warning('command %s found but not loaded' % cls_name)

            return cls

        name_terms = cls_name.split('_')

        if not _update_best_match(name_terms, prefix):

            if _debug:

                kloger.warning('%s failed to update_best_match' % cls_name)

            return None

        global _best_match

        max_len = len(_best_match) + descedants_depth

        if len(name_terms) > max_len:

            partial = '_'.join(name_terms[:max_len])

            if not cmd_tree.has_command(partial):  # add partial path

                cmd_tree.add_command(partial)

            if _debug:

                kloger.warning('%s failed max_len test' % cls_name)

            return None

        try:

            (

                cls.description, sep, cls.long_description

            ) = cls.__doc__.partition('\n')

        except AttributeError:

            raise CLICmdSpecError(

                'No commend in %s (acts as cmd description)' % cls.__name__)

        _construct_command_syntax(cls)

        cmd_tree.add_command(cls_name, cls.description, cls)

        return cls

    return wrap

cmd_spec_locations = [

    'kamaki.cli.commands',

    'kamaki.commands',

    'kamaki.cli',

    'kamaki',

    '']

#  Generic init auxiliary functions

def _setup_logging(silent=False, debug=False, verbose=False, include=False):

    """handle logging for clients package"""

    if silent:

        logger.add_stream_logger(__name__, logging.CRITICAL)

        return

    sfmt, rfmt = '> %(message)s', '< %(message)s'

    if debug:

        print('Logging location: %s' % logger.get_log_filename())

        logger.add_stream_logger('kamaki.clients.send', logging.DEBUG, sfmt)

        logger.add_stream_logger('kamaki.clients.recv', logging.DEBUG, rfmt)

        logger.add_stream_logger(__name__, logging.DEBUG)

    elif verbose:

        logger.add_stream_logger('kamaki.clients.send', logging.INFO, sfmt)

        logger.add_stream_logger('kamaki.clients.recv', logging.INFO, rfmt)

        logger.add_stream_logger(__name__, logging.INFO)

    if include:

        logger.add_stream_logger('kamaki.clients.send', logging.INFO, sfmt)

        logger.add_stream_logger('kamaki.clients.recv', logging.INFO, rfmt)

    logger.add_stream_logger(__name__, logging.WARNING)

    global kloger

    kloger = logger.get_logger(__name__)

def _check_config_version(cnf):

    guess = cnf.guess_version()

    if exists(cnf.path) and guess < 0.9:

        print('Config file format version >= 9.0 is required')

        print('Configuration file: %s' % cnf.path)

        print('Attempting to fix this:')

        print('Calculating changes while preserving information')

        lost_terms = cnf.rescue_old_file()

        print('... DONE')

        if lost_terms:

            print 'The following information will NOT be preserved:'

            print '\t', '\n\t'.join(lost_terms)

        print('Kamaki is ready to convert the config file')

        stdout.write('Create (overwrite) file %s ? [y/N] ' % cnf.path)

        from sys import stdin

        reply = stdin.readline()

        if reply in ('Y\n', 'y\n'):

            cnf.write()

            print('... DONE')

        else:

            print('... ABORTING')

            raise CLIError(

                'Invalid format for config file %s' % cnf.path,

                importance=3, details=[

                    'Please, update config file',

                    'For automatic conversion, rerun and say Y'])

def _init_session(arguments, is_non_API=False):

    """

    :returns: (AuthCachedClient, str) authenticator and cloud name

    """

    global _help

    _help = arguments['help'].value

    global _debug

    _debug = arguments['debug'].value

    global _include

    _include = arguments['include'].value

    global _verbose

    _verbose = arguments['verbose'].value

    _cnf = arguments['config']

    if _help or is_non_API:

        return None, None

    _check_config_version(_cnf.value)

    global _colors

    _colors = _cnf.value.get_global('colors')

    if not (stdout.isatty() and _colors == 'on'):

        from kamaki.cli.utils import remove_colors

        remove_colors()

    _silent = arguments['silent'].value

    _setup_logging(_silent, _debug, _verbose, _include)

    cloud = arguments['cloud'].value or _cnf.value.get(

        'global', 'default_cloud')

    if not cloud:

        num_of_clouds = len(_cnf.value.keys('cloud'))

        if num_of_clouds == 1:

            cloud = _cnf.value.keys('cloud')[0]

        elif num_of_clouds > 1:

            raise CLIError(

                'Found %s clouds but none of them is set as default' % (

                    num_of_clouds),

                importance=2, details=[

                    'Please, choose one of the following cloud names:',

                    ', '.join(_cnf.value.keys('cloud')),

                    'To see all cloud settings:',

                    '  kamaki config get cloud.<cloud name>',

                    'To set a default cloud:',

                    '  kamaki config set default_cloud <cloud name>',

                    'To pick a cloud for the current session, use --cloud:',

                    '  kamaki --cloud=<cloud name> ...'])

    if not cloud in _cnf.value.keys('cloud'):

        raise CLIError(

            'No cloud%s is configured' % ((' "%s"' % cloud) if cloud else ''),

            importance=3, details=[

                'To configure a new cloud "%s", find and set the' % (

                    cloud or '<cloud name>'),

                'single authentication URL and token:',

                '  kamaki config set cloud.%s.url <URL>' % (

                    cloud or '<cloud name>'),

                '  kamaki config set cloud.%s.token <t0k3n>' % (

                    cloud or '<cloud name>')])

    auth_args = dict()

    for term in ('url', 'token'):

        try:

            auth_args[term] = _cnf.get_cloud(cloud, term)

        except KeyError or IndexError:

            auth_args[term] = ''

        if not auth_args[term]:

            raise CLIError(

                'No authentication %s provided for cloud "%s"' % (

                    term.upper(), cloud),

                importance=3, details=[

                    'Set a %s for cloud %s:' % (term.upper(), cloud),

                    '  kamaki config set cloud.%s.%s <%s>' % (

                        cloud, term, term.upper())])

    try:

        auth_base = None

        for token in reversed(auth_args['token'].split()):

            try:

                if auth_base:

                    auth_base.authenticate(token)

                else:

                    auth_base = AuthCachedClient(

                        auth_args['url'], auth_args['token'])

                    auth_base.authenticate(token)

            except ClientError as ce:

                if ce.status in (401, ):

                    kloger.warning(

                        'WARNING: Failed to authorize token %s' % token)

                else:

                    raise

        return auth_base, cloud

    except AssertionError as ae:

        kloger.warning('WARNING: Failed to load authenticator [%s]' % ae)

        return None, cloud

def _load_spec_module(spec, arguments, module):

    if not spec:

        return None

    pkg = None

    for location in cmd_spec_locations:

        location += spec if location == '' else '.%s' % spec

        try:

            pkg = __import__(location, fromlist=[module])

            return pkg

        except ImportError as ie:

            continue

    if not pkg:

        kloger.debug('Loading cmd grp %s failed: %s' % (spec, ie))

    return pkg

def _groups_help(arguments):

    global _debug

    global kloger

    descriptions = {}

    for cmd_group, spec in arguments['config'].get_cli_specs():

        pkg = _load_spec_module(spec, arguments, '_commands')

        if pkg:

            cmds = getattr(pkg, '_commands')

            try:

                for cmd in cmds:

                    descriptions[cmd.name] = cmd.description

            except TypeError:

                if _debug:

                    kloger.warning(

                        'No cmd description for module %s' % cmd_group)

        elif _debug:

            kloger.warning('Loading of %s cmd spec failed' % cmd_group)

    print('\nOptions:\n - - - -')

    print_dict(descriptions)

def _load_all_commands(cmd_tree, arguments):

    _cnf = arguments['config']

    for cmd_group, spec in _cnf.get_cli_specs():

        try:

            spec_module = _load_spec_module(spec, arguments, '_commands')

            spec_commands = getattr(spec_module, '_commands')

        except AttributeError:

            if _debug:

                global kloger

                kloger.warning('No valid description for %s' % cmd_group)

            continue

        for spec_tree in spec_commands:

            if spec_tree.name == cmd_group:

                cmd_tree.add_tree(spec_tree)

                break

#  Methods to be used by CLI implementations

def print_subcommands_help(cmd):

    printout = {}

    for subcmd in cmd.get_subcommands():

        spec, sep, print_path = subcmd.path.partition('_')

        printout[print_path.replace('_', ' ')] = subcmd.description

    if printout:

        print('\nOptions:\n - - - -')

        print_dict(printout)

def update_parser_help(parser, cmd):

    global _best_match

    parser.syntax = parser.syntax.split('<')[0]

    parser.syntax += ' '.join(_best_match)

    description = ''

    if cmd.is_command:

        cls = cmd.get_class()

        parser.syntax += ' ' + cls.syntax

        parser.update_arguments(cls().arguments)

        description = getattr(cls, 'long_description', '')

        description = description.strip()

    else:

        parser.syntax += ' <...>'

    if cmd.has_description:

        parser.parser.description = cmd.help + (

            ('\n%s' % description) if description else '')

    else:

        parser.parser.description = description

def print_error_message(cli_err):

    errmsg = '%s' % cli_err

    if cli_err.importance == 1:

        errmsg = magenta(errmsg)

    elif cli_err.importance == 2:

        errmsg = yellow(errmsg)

    elif cli_err.importance > 2:

        errmsg = red(errmsg)

    stdout.write(errmsg)

    for errmsg in cli_err.details:

        print('|  %s' % errmsg)

def exec_cmd(instance, cmd_args, help_method):

    try:

        return instance.main(*cmd_args)

    except TypeError as err:

        if err.args and err.args[0].startswith('main()'):

            print(magenta('Syntax error'))

            if _debug:

                raise err

            if _verbose:

                print(unicode(err))

            help_method()

        else:

            raise

    return 1

def get_command_group(unparsed, arguments):

    groups = arguments['config'].get_groups()

    for term in unparsed:

        if term.startswith('-'):

            continue

        if term in groups:

            unparsed.remove(term)

            return term

        return None

    return None

def set_command_params(parameters):

    """Add a parameters list to a command

    :param paramters: (list of str) a list of parameters

    """

    global command

    def_params = list(command.func_defaults)

    def_params[0] = parameters

    command.func_defaults = tuple(def_params)

#  CLI Choice:

def run_one_cmd(exe_string, parser, auth_base, cloud):

    global _history

    _history = History(

        parser.arguments['config'].get_global('history_file'))

    _history.add(' '.join([exe_string] + argv[1:]))

    from kamaki.cli import one_command

    one_command.run(auth_base, cloud, parser, _help)

def run_shell(exe_string, parser, auth_base, cloud):

    from command_shell import _init_shell

    try:

        username, userid = (

            auth_base.user_term('name'), auth_base.user_term('id'))

    except Exception:

        username, userid = '', ''

    shell = _init_shell(exe_string, parser, username, userid)

    _load_all_commands(shell.cmd_tree, parser.arguments)

    shell.run(auth_base, cloud, parser)

def is_non_API(parser):

    nonAPIs = ('history', 'config')

    for term in parser.unparsed:

        if not term.startswith('-'):

            if term in nonAPIs:

                return True

            return False

    return False

def main():

    try:

        exe = basename(argv[0])

        parser = ArgumentParseManager(exe)

        if parser.arguments['version'].value:

            exit(0)

        log_file = parser.arguments['config'].get_global('log_file')

        if log_file:

            logger.set_log_filename(log_file)

        global filelog

        filelog = logger.add_file_logger(__name__.split('.')[0])

        filelog.info('* Initial Call *\n%s\n- - -' % ' '.join(argv))

        auth_base, cloud = _init_session(parser.arguments, is_non_API(parser))

        from kamaki.cli.utils import suggest_missing

        global _colors

        exclude = ['ansicolors'] if not _colors == 'on' else []

        suggest_missing(exclude=exclude)

        if parser.unparsed:

            run_one_cmd(exe, parser, auth_base, cloud)

        elif _help:

            parser.parser.print_help()

            _groups_help(parser.arguments)

        else:

            run_shell(exe, parser, auth_base, cloud)

    except CLIError as err:

        print_error_message(err)

        if _debug:

            raise err

        exit(1)

    except Exception as er:

        print('Unknown Error: %s' % er)

        if _debug:

            raise

        exit(1)