watcherclient.common.utils

Source code for watcherclient.common.utils

#
# Copyright 2012 OpenStack LLC.
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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. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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from __future__ import print_function

import argparse
import os
import uuid
import yaml

from oslo_serialization import jsonutils
from oslo_utils import importutils

from watcherclient._i18n import _
from watcherclient import exceptions as exc


[docs]class HelpFormatter(argparse.HelpFormatter):
[docs] def start_section(self, heading): # Title-case the headings heading = '%s%s' % (heading[0].upper(), heading[1:]) super(HelpFormatter, self).start_section(heading)
[docs]def define_command(subparsers, command, callback, cmd_mapper): '''Define a command in the subparsers collection. :param subparsers: subparsers collection where the command will go :param command: command name :param callback: function that will be used to process the command ''' desc = callback.__doc__ or '' help = desc.strip().split('\n')[0] arguments = getattr(callback, 'arguments', []) subparser = subparsers.add_parser(command, help=help, description=desc, add_help=False, formatter_class=HelpFormatter) subparser.add_argument('-h', '--help', action='help', help=argparse.SUPPRESS) cmd_mapper[command] = subparser for (args, kwargs) in arguments: subparser.add_argument(*args, **kwargs) subparser.set_defaults(func=callback)
[docs]def define_commands_from_module(subparsers, command_module, cmd_mapper): """Add *do_* methods in a module and add as commands into a subparsers.""" for method_name in (a for a in dir(command_module) if a.startswith('do_')): # Commands should be hypen-separated instead of underscores. command = method_name[3:].replace('_', '-') callback = getattr(command_module, method_name) define_command(subparsers, command, callback, cmd_mapper)
[docs]def import_versioned_module(version, submodule=None): module = 'watcherclient.v%s' % version if submodule: module = '.'.join((module, submodule)) return importutils.import_module(module)
[docs]def split_and_deserialize(string, exclude_fields=[]): """Split and try to JSON deserialize a string. Gets a string with the KEY=VALUE format, split it (using '=' as the separator) and try to JSON deserialize the VALUE. :returns: A tuple of (key, value). """ try: key, value = string.split("=", 1) except ValueError: raise exc.CommandError(_('Attributes must be a list of ' 'PATH=VALUE not "%s"') % string) if key not in exclude_fields: try: value = jsonutils.loads(value) except ValueError: pass return (key, value)
[docs]def args_array_to_dict(kwargs, key_to_convert): values_to_convert = kwargs.get(key_to_convert) if values_to_convert: kwargs[key_to_convert] = dict(split_and_deserialize(v) for v in values_to_convert) return kwargs
[docs]def args_array_to_patch(op, attributes, exclude_fields=[]): patch = [] for attr in attributes: # Sanitize if not attr.startswith('/'): attr = '/' + attr if op in ['add', 'replace']: path, value = split_and_deserialize(attr, exclude_fields=exclude_fields) patch.append({'op': op, 'path': path, 'value': value}) elif op == "remove": # For remove only the key is needed patch.append({'op': op, 'path': attr}) else: raise exc.CommandError(_('Unknown PATCH operation: %s') % op) return patch
[docs]def common_params_for_list(args, fields, field_labels): """Generate 'params' dict that is common for every 'list' command. :param args: arguments from command line. :param fields: possible fields for sorting. :param field_labels: possible field labels for sorting. :returns: a dict with params to pass to the client method. """ params = {} if args.limit is not None: if args.limit < 0: raise exc.CommandError( _('Expected non-negative --limit, got %s') % args.limit) params['limit'] = args.limit if args.sort_key is not None: # Support using both heading and field name for sort_key fields_map = dict(zip(field_labels, fields)) fields_map.update(zip(fields, fields)) try: sort_key = fields_map[args.sort_key] except KeyError: raise exc.CommandError( _("%(sort_key)s is an invalid field for sorting, " "valid values for --sort-key are: %(valid)s") % {'sort_key': args.sort_key, 'valid': list(fields_map)}) params['sort_key'] = sort_key if args.sort_dir is not None: if args.sort_dir not in ('asc', 'desc'): raise exc.CommandError( _("%s is an invalid value for sort direction, " "valid values for --sort-dir are: 'asc', 'desc'") % args.sort_dir) params['sort_dir'] = args.sort_dir params['detail'] = args.detail return params
[docs]def common_filters(limit=None, sort_key=None, sort_dir=None): """Generate common filters for any list request. :param limit: maximum number of entities to return. :param sort_key: field to use for sorting. :param sort_dir: direction of sorting: 'asc' or 'desc'. :returns: list of string filters. """ filters = [] if isinstance(limit, int) and limit > 0: filters.append('limit=%s' % limit) if sort_key is not None: filters.append('sort_key=%s' % sort_key) if sort_dir is not None: filters.append('sort_dir=%s' % sort_dir) return filters
[docs]def is_uuid_like(val): """Returns validation of a value as a UUID. For our purposes, a UUID is a canonical form string: aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa """ try: return str(uuid.UUID(val)) == val except (TypeError, ValueError, AttributeError): return False
[docs]def serialize_file_to_dict(filename): filename = os.path.expanduser(filename) with open(filename, "rb") as stream: scope = yaml.safe_load(stream.read()) return scope
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