308 lines
10 KiB
Python
308 lines
10 KiB
Python
# Copyright 2014
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# The Cloudscaling Group, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import re
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from glanceclient.common import exceptions as glance_exception
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from oslo_log import log as logging
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from oslo_utils import timeutils
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from ec2api.api import clients
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from ec2api.db import api as db_api
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from ec2api import exception
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from ec2api.i18n import _
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LOG = logging.getLogger(__name__)
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_c2u = re.compile('(((?<=[a-z])[A-Z])|([A-Z](?![A-Z]|$)))')
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def camelcase_to_underscore(str):
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return _c2u.sub(r'_\1', str).lower().strip('_')
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def _try_convert(value):
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"""Return a non-string from a string or unicode, if possible.
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============= =====================================================
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When value is returns
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============= =====================================================
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zero-length ''
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'None' None
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'True' True case insensitive
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'False' False case insensitive
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'0', '-0' 0
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0xN, -0xN int from hex (positive) (N is any number)
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0bN, -0bN int from binary (positive) (N is any number)
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* try conversion to int, float, complex, fallback value
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"""
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def _negative_zero(value):
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epsilon = 1e-7
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return 0 if abs(value) < epsilon else value
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if len(value) == 0:
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return ''
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if value == 'None':
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return None
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lowered_value = value.lower()
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if lowered_value == 'true':
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return True
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if lowered_value == 'false':
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return False
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for prefix, base in [('0x', 16), ('0b', 2), ('0', 8), ('', 10)]:
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try:
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if lowered_value.startswith((prefix, "-" + prefix)):
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return int(lowered_value, base)
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except ValueError:
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pass
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try:
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return _negative_zero(float(value))
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except ValueError:
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return value
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def dict_from_dotted_str(items):
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"""parse multi dot-separated argument into dict.
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EBS boot uses multi dot-separated arguments like
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BlockDeviceMapping.1.DeviceName=snap-id
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Convert the above into
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{'block_device_mapping': {'1': {'device_name': snap-id}}}
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"""
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args = {}
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for key, value in items:
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parts = key.split(".")
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key = str(camelcase_to_underscore(parts[0]))
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if isinstance(value, str) or isinstance(value, unicode):
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# NOTE(vish): Automatically convert strings back
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# into their respective values
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value = _try_convert(value)
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if len(parts) > 1:
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d = args.get(key, {})
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args[key] = d
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for k in parts[1:-1]:
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k = camelcase_to_underscore(k)
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v = d.get(k, {})
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d[k] = v
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d = v
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d[camelcase_to_underscore(parts[-1])] = value
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else:
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args[key] = value
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return args
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_ms_time_regex = re.compile('^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3,6}Z$')
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def is_ec2_timestamp_expired(request, expires=None):
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"""Checks the timestamp or expiry time included in an EC2 request
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and returns true if the request is expired
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"""
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query_time = None
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timestamp = request.get('Timestamp')
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expiry_time = request.get('Expires')
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def parse_strtime(strtime):
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if _ms_time_regex.match(strtime):
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# NOTE(MotoKen): time format for aws-sdk-java contains millisecond
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time_format = "%Y-%m-%dT%H:%M:%S.%fZ"
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else:
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time_format = "%Y-%m-%dT%H:%M:%SZ"
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return timeutils.parse_strtime(strtime, time_format)
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try:
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if timestamp and expiry_time:
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msg = _("Request must include either Timestamp or Expires,"
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" but cannot contain both")
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LOG.error(msg)
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raise exception.InvalidRequest(msg)
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elif expiry_time:
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query_time = parse_strtime(expiry_time)
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return timeutils.is_older_than(query_time, -1)
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elif timestamp:
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query_time = parse_strtime(timestamp)
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# Check if the difference between the timestamp in the request
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# and the time on our servers is larger than 5 minutes, the
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# request is too old (or too new).
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if query_time and expires:
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return (timeutils.is_older_than(query_time, expires) or
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timeutils.is_newer_than(query_time, expires))
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return False
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except ValueError:
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LOG.exception(_("Timestamp is invalid: "))
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return True
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# NOTE(ft): extra functions to use in vpc specific code or instead of
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# malformed existed functions
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def get_ec2_id_kind(obj_id):
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return obj_id.split('-')[0]
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def change_ec2_id_kind(obj_id, new_kind):
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return '%(kind)s-%(id)s' % {'kind': new_kind,
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'id': obj_id.split('-')[-1]}
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NOT_FOUND_EXCEPTION_MAP = {
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'vpc': exception.InvalidVpcIDNotFound,
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'igw': exception.InvalidInternetGatewayIDNotFound,
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'subnet': exception.InvalidSubnetIDNotFound,
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'eni': exception.InvalidNetworkInterfaceIDNotFound,
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'dopt': exception.InvalidDhcpOptionsIDNotFound,
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'eipalloc': exception.InvalidAllocationIDNotFound,
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'sg': exception.InvalidGroupNotFound,
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'rtb': exception.InvalidRouteTableIDNotFound,
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'i': exception.InvalidInstanceIDNotFound,
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'kp': exception.InvalidKeypairNotFound,
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'az': exception.InvalidAvailabilityZoneNotFound,
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'vol': exception.InvalidVolumeNotFound,
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'snap': exception.InvalidSnapshotNotFound,
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'ami': exception.InvalidAMIIDNotFound,
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'aki': exception.InvalidAMIIDNotFound,
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'ari': exception.InvalidAMIIDNotFound,
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}
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def get_db_item(context, ec2_id, expected_kind=None):
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"""Get an DB item, raise AWS compliant exception if it's not found.
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Args:
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context (RequestContext): The request context.
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ec2_id (str): The ID of the requested item.
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expected_kind (str): The expected kind of the requested item.
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It should be specified for a kind of ec2_id to be validated,
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if you need it.
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Returns:
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The DB item.
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"""
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item = db_api.get_item_by_id(context, ec2_id)
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if (item is None or
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expected_kind and get_ec2_id_kind(ec2_id) != expected_kind):
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kind = expected_kind or get_ec2_id_kind(ec2_id)
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params = {'id': ec2_id}
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raise NOT_FOUND_EXCEPTION_MAP[kind](**params)
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return item
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def get_db_items(context, kind, ec2_ids):
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if not ec2_ids:
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return db_api.get_items(context, kind)
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if not isinstance(ec2_ids, set):
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ec2_ids = set(ec2_ids)
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items = db_api.get_items_by_ids(context, ec2_ids)
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if len(items) < len(ec2_ids):
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missed_ids = ec2_ids - set((item['id'] for item in items))
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params = {'id': next(iter(missed_ids))}
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raise NOT_FOUND_EXCEPTION_MAP[kind](**params)
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return items
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_auto_create_db_item_extensions = {}
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def register_auto_create_db_item_extension(kind, extension):
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_auto_create_db_item_extensions[kind] = extension
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def auto_create_db_item(context, kind, os_id, **extension_kwargs):
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item = {'os_id': os_id}
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extension = _auto_create_db_item_extensions.get(kind)
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if extension:
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extension(context, item, **extension_kwargs)
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return db_api.add_item(context, kind, item)
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def get_db_item_by_os_id(context, kind, os_id, items_by_os_id=None,
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**extension_kwargs):
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"""Get DB item by OS id (create if it doesn't exist).
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Args:
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context (RequestContext): The request context.
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kind (str): The kind of item.
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os_id (str): OS id of an object.
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items_by_os_id (dict of items): The dict of known DB items,
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OS id is used as a key.
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extension_kwargs (dict): Additional parameters passed to
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a registered extension at creating item.
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Returns:
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A found or created item.
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Search item in passed dict. If it's not found - create a new item, and
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add it to the dict (if it's passed).
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If an extension is registered on corresponding item kind, call it
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passing extension_kwargs to it.
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"""
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if os_id is None:
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return None
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if items_by_os_id is not None:
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item = items_by_os_id.get(os_id)
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if item:
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return item
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else:
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item = next((i for i in db_api.get_items(context, kind)
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if i['os_id'] == os_id), None)
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if not item:
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item = auto_create_db_item(context, kind, os_id, **extension_kwargs)
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if items_by_os_id is not None:
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items_by_os_id[os_id] = item
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return item
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# TODO(andrey-mp): project_id is a temporary workaround which should be
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# reworked asap. (c) by ftersin.
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def os_id_to_ec2_id(context, kind, os_id, items_by_os_id=None,
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ids_by_os_id=None, project_id=None):
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if os_id is None:
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return None
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if ids_by_os_id is not None:
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item_id = ids_by_os_id.get(os_id)
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if item_id:
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return item_id
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if items_by_os_id is not None:
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item = items_by_os_id.get(os_id)
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if item:
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return item['id']
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ids = db_api.get_items_ids(context, kind, (os_id,))
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if len(ids):
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item_id, _os_id = ids[0]
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else:
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item_id = db_api.add_item_id(context, kind, os_id,
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project_id=project_id)
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if ids_by_os_id is not None:
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ids_by_os_id[os_id] = item_id
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return item_id
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def get_os_image(context, ec2_image_id):
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kind = get_ec2_id_kind(ec2_image_id)
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images = db_api.get_public_items(context, kind, (ec2_image_id,))
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image = (images[0] if len(images) else
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get_db_item(context, ec2_image_id))
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glance = clients.glance(context)
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try:
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return glance.images.get(image['os_id'])
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except glance_exception.HTTPNotFound:
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raise exception.InvalidAMIIDNotFound(id=ec2_image_id)
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