138 lines
4.1 KiB
Python
138 lines
4.1 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import re
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from nova import exception
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def ec2_id_to_id(ec2_id):
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"""Convert an ec2 ID (i-[base 16 number]) to an instance id (int)"""
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try:
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return int(ec2_id.split('-')[-1], 16)
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except ValueError:
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raise exception.InvalidEc2Id(ec2_id=ec2_id)
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def id_to_ec2_id(instance_id, template='i-%08x'):
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"""Convert an instance ID (int) to an ec2 ID (i-[base 16 number])"""
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return template % instance_id
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def id_to_ec2_snap_id(instance_id):
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"""Convert an snapshot ID (int) to an ec2 snapshot ID
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(snap-[base 16 number])"""
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return id_to_ec2_id(instance_id, 'snap-%08x')
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def id_to_ec2_vol_id(instance_id):
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"""Convert an volume ID (int) to an ec2 volume ID (vol-[base 16 number])"""
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return id_to_ec2_id(instance_id, 'vol-%08x')
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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 (postitive) (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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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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valueneg = value[1:] if value[0] == '-' else value
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if valueneg == '0':
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return 0
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if valueneg == '':
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return value
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if valueneg[0] == '0':
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if valueneg[1] in 'xX':
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return int(value, 16)
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elif valueneg[1] in 'bB':
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return int(value, 2)
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else:
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try:
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return int(value, 8)
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except ValueError:
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pass
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try:
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return int(value)
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except ValueError:
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pass
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try:
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return float(value)
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except ValueError:
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pass
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try:
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return complex(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-separeted 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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