__init__.py 17.4 KB
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# Copyright 2012-2013 GRNET S.A. All rights reserved.
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#
# 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
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#      copyright notice, this list of conditions and the following
#      disclaimer.
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#
#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
#      disclaimer in the documentation and/or other materials
#      provided with the distribution.
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#
# 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
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# or implied, of GRNET S.A.command
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import logging
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from sys import argv, exit, stdout
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from os.path import basename, exists
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from inspect import getargspec
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from kamaki.cli.argument import ArgumentParseManager
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from kamaki.cli.history import History
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from kamaki.cli.utils import print_dict, red, magenta, yellow
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from kamaki.cli.errors import CLIError, CLICmdSpecError
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from kamaki.cli import logger
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from kamaki.clients.astakos import AstakosClient as AuthCachedClient
from kamaki.clients import ClientError
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_help = False
_debug = False
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_include = False
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_verbose = False
_colors = False
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kloger = None
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filelog = None
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#  command auxiliary methods

_best_match = []

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def _arg2syntax(arg):
    return arg.replace(
        '____', '[:').replace(
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            '___', ':').replace(
                '__', ']').replace(
                    '_', ' ')
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def _construct_command_syntax(cls):
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        spec = getargspec(cls.main.im_func)
        args = spec.args[1:]
        n = len(args) - len(spec.defaults or ())
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        required = ' '.join(['<%s>' % _arg2syntax(x) for x in args[:n]])
        optional = ' '.join(['[%s]' % _arg2syntax(x) for x in args[n:]])
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        cls.syntax = ' '.join(x for x in [required, optional] if x)
        if spec.varargs:
            cls.syntax += ' <%s ...>' % spec.varargs


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def _num_of_matching_terms(basic_list, attack_list):
    if not attack_list:
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        return len(basic_list)
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    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
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def _update_best_match(name_terms, prefix=[]):
    if prefix:
        pref_list = prefix if isinstance(prefix, list) else prefix.split('_')
    else:
        pref_list = []
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    num_of_matching_terms = _num_of_matching_terms(name_terms, pref_list)
    global _best_match
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    if not prefix:
        _best_match = []
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    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
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        e.g. spec_cmd0_cmd1 will be command spec cmd0

        :param cmd_tree: is initialized in cmd_spec file and is the structure
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            where commands are loaded. Var name should be _commands
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        :param prefix: if given, load only commands prefixed with prefix,
        :param descedants_depth: is the depth of the tree descedants of the
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            prefix command. It is used ONLY if prefix and if prefix is not
            a terminal command
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        :returns: the specified class object
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    """

    def wrap(cls):
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        global kloger
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        cls_name = cls.__name__

        if not cmd_tree:
            if _debug:
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                kloger.warning('command %s found but not loaded' % cls_name)
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            return cls
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        name_terms = cls_name.split('_')
        if not _update_best_match(name_terms, prefix):
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            if _debug:
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                kloger.warning('%s failed to update_best_match' % cls_name)
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            return None
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        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)
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            if _debug:
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                kloger.warning('%s failed max_len test' % cls_name)
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            return None
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        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__)
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        _construct_command_syntax(cls)
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        cmd_tree.add_command(cls_name, cls.description, cls)
        return cls
    return wrap
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cmd_spec_locations = [
    'kamaki.cli.commands',
    'kamaki.commands',
    'kamaki.cli',
    'kamaki',
    '']
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#  Generic init auxiliary functions


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def _setup_logging(silent=False, debug=False, verbose=False, include=False):
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    """handle logging for clients package"""

    if silent:
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        logger.add_stream_logger(__name__, logging.CRITICAL)
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        return

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    sfmt, rfmt = '> %(message)s', '< %(message)s'
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    if debug:
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        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)
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    elif verbose:
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        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)
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    if include:
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        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)
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    global kloger
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    kloger = logger.get_logger(__name__)
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def _check_config_version(cnf):
    guess = cnf.guess_version()
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    if exists(cnf.path) and guess < 0.9:
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        print('Config file format version >= 9.0 is required')
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        print('Configuration file: %s' % cnf.path)
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        print('Attempting to fix this:')
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        print('Calculating changes while preserving information')
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        lost_terms = cnf.rescue_old_file()
        print('... DONE')
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        if lost_terms:
            print 'The following information will NOT be preserved:'
            print '\t', '\n\t'.join(lost_terms)
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        print('Kamaki is ready to convert the config file')
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        stdout.write('Create (overwrite) file %s ? [y/N] ' % cnf.path)
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        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,
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                importance=3, details=[
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                    'Please, update config file',
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                    'For automatic conversion, rerun and say Y'])
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def _init_session(arguments, is_non_API=False):
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    """
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    :returns: (AuthCachedClient, str) authenticator and cloud name
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    """
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    global _help
    _help = arguments['help'].value
    global _debug
    _debug = arguments['debug'].value
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    global _include
    _include = arguments['include'].value
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    global _verbose
    _verbose = arguments['verbose'].value
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    _cnf = arguments['config']
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    if _help or is_non_API:
        return None, None

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    _check_config_version(_cnf.value)
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    global _colors
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    _colors = _cnf.value.get_global('colors')
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    if not (stdout.isatty() and _colors == 'on'):
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        from kamaki.cli.utils import remove_colors
        remove_colors()
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    _silent = arguments['silent'].value
    _setup_logging(_silent, _debug, _verbose, _include)
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    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]
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        elif num_of_clouds > 1:
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            raise CLIError(
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                'Found %s clouds but none of them is set as default' % (
                    num_of_clouds),
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                importance=2, details=[
                    'Please, choose one of the following cloud names:',
                    ', '.join(_cnf.value.keys('cloud')),
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                    'To see all cloud settings:',
                    '  kamaki config get cloud.<cloud name>',
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                    '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> ...'])
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    if not cloud in _cnf.value.keys('cloud'):
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        raise CLIError(
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            'No cloud%s is configured' % ((' "%s"' % cloud) if cloud else ''),
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            importance=3, details=[
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                'To configure a new cloud "%s", find and set the' % (
                    cloud or '<cloud name>'),
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                'single authentication URL and token:',
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                '  kamaki config set cloud.%s.url <URL>' % (
                    cloud or '<cloud name>'),
                '  kamaki config set cloud.%s.token <t0k3n>' % (
                    cloud or '<cloud name>')])
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    auth_args = dict()
    for term in ('url', 'token'):
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        try:
            auth_args[term] = _cnf.get_cloud(cloud, term)
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        except KeyError or IndexError:
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            auth_args[term] = ''
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        if not auth_args[term]:
            raise CLIError(
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                'No authentication %s provided for cloud "%s"' % (
                    term.upper(), cloud),
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                importance=3, details=[
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                    'Set a %s for cloud %s:' % (term.upper(), cloud),
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                    '  kamaki config set cloud.%s.%s <%s>' % (
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                        cloud, term, term.upper())])
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    try:
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        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
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    except AssertionError as ae:
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        kloger.warning('WARNING: Failed to load authenticator [%s]' % ae)
        return None, cloud
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def _load_spec_module(spec, arguments, module):
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    if not spec:
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        return None
    pkg = None
    for location in cmd_spec_locations:
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        location += spec if location == '' else '.%s' % spec
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        try:
            pkg = __import__(location, fromlist=[module])
            return pkg
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        except ImportError as ie:
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            continue
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    if not pkg:
        kloger.debug('Loading cmd grp %s failed: %s' % (spec, ie))
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    return pkg


def _groups_help(arguments):
    global _debug
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    global kloger
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    descriptions = {}
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    acceptable_groups = arguments['config'].get_groups()
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    for cmd_group, spec in arguments['config'].get_cli_specs():
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        pkg = _load_spec_module(spec, arguments, '_commands')
        if pkg:
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            cmds = getattr(pkg, '_commands')
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            try:
                for cmd in cmds:
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                    if cmd.name in acceptable_groups:
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                        descriptions[cmd.name] = cmd.help
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            except TypeError:
                if _debug:
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                    kloger.warning(
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                        'No cmd description (help) for module %s' % cmd_group)
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        elif _debug:
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            kloger.warning('Loading of %s cmd spec failed' % cmd_group)
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    print('\nOptions:\n - - - -')
    print_dict(descriptions)


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def _load_all_commands(cmd_tree, arguments):
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    _cnf = arguments['config']
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    for cmd_group, spec in _cnf.get_cli_specs():
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        try:
            spec_module = _load_spec_module(spec, arguments, '_commands')
            spec_commands = getattr(spec_module, '_commands')
        except AttributeError:
            if _debug:
                global kloger
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                kloger.warning('No valid description for %s' % cmd_group)
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            continue
        for spec_tree in spec_commands:
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            if spec_tree.name == cmd_group:
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                cmd_tree.add_tree(spec_tree)
                break


#  Methods to be used by CLI implementations


def print_subcommands_help(cmd):
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    printout = {}
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    for subcmd in cmd.subcommands.values():
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        spec, sep, print_path = subcmd.path.partition('_')
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        printout[print_path.replace('_', ' ')] = subcmd.help
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    if printout:
        print('\nOptions:\n - - - -')
        print_dict(printout)


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def update_parser_help(parser, cmd):
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    global _best_match
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    parser.syntax = parser.syntax.split('<')[0]
    parser.syntax += ' '.join(_best_match)
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    description = ''
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    if cmd.is_command:
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        cls = cmd.cmd_class
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        parser.syntax += ' ' + cls.syntax
        parser.update_arguments(cls().arguments)
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        description = getattr(cls, 'long_description', '').strip()
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    else:
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        parser.syntax += ' <...>'
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    parser.parser.description = (
        cmd.help + ('\n' if description else '')) if cmd.help else description
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def print_error_message(cli_err):
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    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)
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    for errmsg in cli_err.details:
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        print('|  %s' % errmsg)
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def exec_cmd(instance, cmd_args, help_method):
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    try:
        return instance.main(*cmd_args)
    except TypeError as err:
        if err.args and err.args[0].startswith('main()'):
            print(magenta('Syntax error'))
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            if _debug:
                raise err
            if _verbose:
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                print(unicode(err))
            help_method()
        else:
            raise
    return 1

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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


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def set_command_params(parameters):
    """Add a parameters list to a command

    :param paramters: (list of str) a list of parameters
    """
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    global command
    def_params = list(command.func_defaults)
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    def_params[0] = parameters
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    command.func_defaults = tuple(def_params)


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#  CLI Choice:
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def run_one_cmd(exe_string, parser, auth_base, cloud):
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    global _history
    _history = History(
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        parser.arguments['config'].get_global('history_file'))
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    _history.add(' '.join([exe_string] + argv[1:]))
    from kamaki.cli import one_command
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    one_command.run(auth_base, cloud, parser, _help)
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def run_shell(exe_string, parser, auth_base, cloud):
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    from command_shell import _init_shell
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    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)
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    _load_all_commands(shell.cmd_tree, parser.arguments)
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    shell.run(auth_base, cloud, parser)
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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


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def main():
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    try:
        exe = basename(argv[0])
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        parser = ArgumentParseManager(exe)
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        if parser.arguments['version'].value:
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            exit(0)

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        log_file = parser.arguments['config'].get_global('log_file')
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        if log_file:
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            logger.set_log_filename(log_file)
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        global filelog
        filelog = logger.add_file_logger(__name__.split('.')[0])
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        filelog.info('* Initial Call *\n%s\n- - -' % ' '.join(argv))
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        auth_base, cloud = _init_session(parser.arguments, is_non_API(parser))
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        from kamaki.cli.utils import suggest_missing
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        global _colors
        exclude = ['ansicolors'] if not _colors == 'on' else []
        suggest_missing(exclude=exclude)
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        if parser.unparsed:
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            run_one_cmd(exe, parser, auth_base, cloud)
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        elif _help:
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            parser.parser.print_help()
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            _groups_help(parser.arguments)
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        else:
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            run_shell(exe, parser, auth_base, cloud)
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    except CLIError as err:
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        print_error_message(err)
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        if _debug:
            raise err
        exit(1)
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    except Exception as er:
        print('Unknown Error: %s' % er)
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        if _debug:
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            raise
        exit(1)