375 lines
16 KiB
Python
375 lines
16 KiB
Python
import os
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import sys
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import yaml
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import argparse
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def apply_maps(template):
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"""Apply Merge::Map within template.
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Any dict {'Merge::Map': {'Foo': 'Bar', 'Baz': 'Quux'}}
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will resolve to ['Bar', 'Quux'] - that is a dict with key
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'Merge::Map' is replaced entirely by that dict['Merge::Map'].values().
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"""
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if isinstance(template, dict):
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if 'Merge::Map' in template:
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return sorted(
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apply_maps(value) for value in template['Merge::Map'].values()
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)
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else:
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return dict((key, apply_maps(value))
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for key, value in template.items())
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elif isinstance(template, list):
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return [apply_maps(item) for item in template]
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else:
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return template
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def apply_scaling(template, scaling, in_copies=None):
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"""Apply a set of scaling operations to template.
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This is a single pass recursive function: for each call we process one
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dict or list and recurse to handle children containers.
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Values are handled via scale_value.
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Keys in dicts are copied per the scaling rule.
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Values are either replaced or copied depending on whether the given
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scaling rule is in in_copies.
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in_copies is reset to None when a dict {'Merge::Map': someobject} is
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encountered.
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"""
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in_copies = dict(in_copies or {})
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# Shouldn't be needed but to avoid unexpected side effects/bugs we short
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# circuit no-ops.
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if not scaling:
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return template
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if isinstance(template, dict):
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if 'Merge::Map' in template:
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in_copies = None
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new_template = {}
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for key, value in template.items():
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for prefix, copy_num, new_key in scale_value(
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key, scaling, in_copies):
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if prefix:
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# e.g. Compute0, 1, Compute1Foo
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in_copies[prefix] = prefix[:-1] + str(copy_num)
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if isinstance(value, (dict, list)):
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new_value = apply_scaling(value, scaling, in_copies)
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new_template[new_key] = new_value
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else:
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new_values = list(scale_value(value, scaling, in_copies))
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# We have nowhere to multiply a non-container value of a
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# dict, so it may be copied or unchanged but not scaled.
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assert len(new_values) == 1
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new_template[new_key] = new_values[0][2]
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if prefix:
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del in_copies[prefix]
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return new_template
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elif isinstance(template, list):
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new_template = []
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for value in template:
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if isinstance(value, (dict, list)):
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new_template.append(apply_scaling(value, scaling, in_copies))
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else:
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for _, _, new_value in scale_value(value, scaling, in_copies):
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new_template.append(new_value)
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return new_template
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else:
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raise Exception("apply_scaling called with non-container %r" % template)
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def scale_value(value, scaling, in_copies):
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"""Scale out a value.
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:param value: The value to scale (not a container).
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:param scaling: The scaling map to use.
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:param in_copies: What containers we're currently copying.
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:return: An iterator of the new values for the value as tuples:
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(prefix, copy_num, value). E.g. Compute0, 1, Compute1Foo
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prefix and copy_num are only set when:
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- a prefix in scaling matches value
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- and that prefix is not in in_copies
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"""
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if isinstance(value, (str, unicode)):
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for prefix, copies in scaling.items():
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if not value.startswith(prefix):
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continue
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suffix = value[len(prefix):]
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if prefix in in_copies:
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# Adjust to the copy number we're on
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yield None, None, in_copies[prefix] + suffix
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return
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else:
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for n in range(copies):
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yield prefix, n, prefix[:-1] + str(n) + suffix
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return
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yield None, None, value
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else:
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yield None, None, value
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def parse_scaling(scaling_args):
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"""Translate a list of scaling requests to a dict prefix:count."""
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scaling_args = scaling_args or []
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result = {}
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for item in scaling_args:
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key, value = item.split('=')
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value = int(value)
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result[key + '0'] = value
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return result
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def _translate_role(role, master_role, slave_roles):
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if not master_role:
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return role
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if role == master_role:
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return role
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if role not in slave_roles:
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return role
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return master_role
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def translate_role(role, master_role, slave_roles):
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r = _translate_role(role, master_role, slave_roles)
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if not isinstance(r, basestring):
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raise Exception('%s -> %r' % (role, r))
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return r
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def resolve_params(item, param, value):
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if item == {'Ref': param}:
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return value
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if isinstance(item, dict):
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copy_item = dict(item)
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for k, v in iter(copy_item.items()):
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item[k] = resolve_params(v, param, value)
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elif isinstance(item, list):
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copy_item = list(item)
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new_item = []
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for v in copy_item:
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new_item.append(resolve_params(v, param, value))
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item = new_item
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return item
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MERGABLE_TYPES = {'OS::Nova::Server':
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{'image': 'image'},
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'AWS::EC2::Instance':
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{'image': 'ImageId'},
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'AWS::AutoScaling::LaunchConfiguration':
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{},
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}
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INCLUDED_TEMPLATE_DIR = os.getcwd()
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def resolve_includes(template, params=None):
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new_template = {}
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if params is None:
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params = {}
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for key, value in iter(template.items()):
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if key == '__include__':
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new_params = dict(params) # do not propagate up the stack
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if not isinstance(value, dict):
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raise ValueError('__include__ must be a mapping')
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if 'path' not in value:
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raise ValueError('__include__ must have path')
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if 'params' in value:
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if not isinstance(value['params'], dict):
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raise ValueError('__include__ params must be a mapping')
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new_params.update(value['params'])
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with open(value['path']) as include_file:
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sub_template = yaml.safe_load(include_file.read())
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if 'subkey' in value:
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if ((not isinstance(value['subkey'], int)
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and not isinstance(sub_template, dict))):
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raise RuntimeError('subkey requires mapping root or'
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' integer for list root')
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sub_template = sub_template[value['subkey']]
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for k, v in iter(new_params.items()):
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sub_template = resolve_params(sub_template, k, v)
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new_template.update(resolve_includes(sub_template))
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else:
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if isinstance(value, dict):
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new_template[key] = resolve_includes(value)
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else:
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new_template[key] = value
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return new_template
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def main(argv=None):
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if argv is None:
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argv = sys.argv[1:]
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parser = argparse.ArgumentParser()
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parser.add_argument('templates', nargs='+')
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parser.add_argument('--master-role', nargs='?',
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help='Translate slave_roles to this')
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parser.add_argument('--slave-roles', nargs='*',
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help='Translate all of these to master_role')
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parser.add_argument('--included-template-dir', nargs='?',
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default=INCLUDED_TEMPLATE_DIR,
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help='Path for resolving included templates')
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parser.add_argument('--output',
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help='File to write output to. - for stdout',
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default='-')
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parser.add_argument('--scale', action="append",
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help="Names to scale out. Pass Prefix=1 to cause a key Prefix0Foo to "
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"be copied to Prefix1Foo in the output, and value Prefix0Bar to be"
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"renamed to Prefix1Bar inside that copy, or copied to Prefix1Bar "
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"outside of any copy.")
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parser.add_argument(
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'--change-image-params', action='store_true', default=False,
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help="Change parameters in templates to match resource names. This was "
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" the default at one time but it causes issues when parameter "
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" names need to remain stable.")
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args = parser.parse_args(argv)
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templates = args.templates
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scaling = parse_scaling(args.scale)
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merged_template = merge(templates, args.master_role, args.slave_roles,
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args.included_template_dir, scaling=scaling,
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change_image_params=args.change_image_params)
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if args.output == '-':
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out_file = sys.stdout
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else:
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out_file = file(args.output, 'wt')
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out_file.write(merged_template)
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def merge(templates, master_role=None, slave_roles=None,
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included_template_dir=INCLUDED_TEMPLATE_DIR,
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scaling=None, change_image_params=None):
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scaling = scaling or {}
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errors = []
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end_template={'HeatTemplateFormatVersion': '2012-12-12',
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'Description': []}
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resource_changes=[]
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for template_path in templates:
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template = yaml.safe_load(open(template_path))
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# Resolve __include__ tags
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template = resolve_includes(template)
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end_template['Description'].append(template.get('Description',
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template_path))
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new_parameters = template.get('Parameters', {})
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for p, pbody in sorted(new_parameters.items()):
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if p in end_template.get('Parameters', {}):
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if pbody != end_template['Parameters'][p]:
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errors.append('Parameter %s from %s conflicts.' % (p,
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template_path))
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continue
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if 'Parameters' not in end_template:
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end_template['Parameters'] = {}
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end_template['Parameters'][p] = pbody
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new_outputs = template.get('Outputs', {})
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for o, obody in sorted(new_outputs.items()):
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if o in end_template.get('Outputs', {}):
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if pbody != end_template['Outputs'][p]:
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errors.append('Output %s from %s conflicts.' % (o,
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template_path))
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continue
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if 'Outputs' not in end_template:
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end_template['Outputs'] = {}
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end_template['Outputs'][o] = obody
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new_resources = template.get('Resources', {})
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for r, rbody in sorted(new_resources.items()):
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if rbody['Type'] in MERGABLE_TYPES:
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if change_image_params:
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if 'image' in MERGABLE_TYPES[rbody['Type']]:
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image_key = MERGABLE_TYPES[rbody['Type']]['image']
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# XXX Assuming ImageId is always a Ref
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ikey_val = end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
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del end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
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role = rbody.get('Metadata', {}).get('OpenStack::Role', r)
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role = translate_role(role, master_role, slave_roles)
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if role != r:
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resource_changes.append((r, role))
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if role in end_template.get('Resources', {}):
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new_metadata = rbody.get('Metadata', {})
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for m, mbody in iter(new_metadata.items()):
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if m in end_template['Resources'][role].get('Metadata', {}):
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if m == 'OpenStack::ImageBuilder::Elements':
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end_template['Resources'][role]['Metadata'][m].extend(mbody)
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continue
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if mbody != end_template['Resources'][role]['Metadata'][m]:
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errors.append('Role %s metadata key %s conflicts.' %
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(role, m))
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continue
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role_res = end_template['Resources'][role]
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if role_res['Type'] == 'OS::Heat::StructuredConfig':
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end_template['Resources'][role]['Properties']['config'][m] = mbody
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else:
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end_template['Resources'][role]['Metadata'][m] = mbody
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continue
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if 'Resources' not in end_template:
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end_template['Resources'] = {}
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end_template['Resources'][role] = rbody
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if change_image_params:
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if 'image' in MERGABLE_TYPES[rbody['Type']]:
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ikey = '%sImage' % (role)
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end_template['Resources'][role]['Properties'][image_key] = {'Ref': ikey}
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end_template['Parameters'][ikey] = ikey_val
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elif rbody['Type'] == 'FileInclude':
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# we trust os.path.join to DTRT: if FileInclude path isn't
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# absolute, join to included_template_dir (./)
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with open(os.path.join(included_template_dir, rbody['Path'])) as rfile:
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include_content = yaml.safe_load(rfile.read())
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subkeys = rbody.get('SubKey','').split('.')
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while len(subkeys) and subkeys[0]:
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include_content = include_content[subkeys.pop(0)]
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for replace_param, replace_value in iter(rbody.get('Parameters',
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{}).items()):
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include_content = resolve_params(include_content,
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replace_param,
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replace_value)
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if 'Resources' not in end_template:
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end_template['Resources'] = {}
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end_template['Resources'][r] = include_content
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else:
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if r in end_template.get('Resources', {}):
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if rbody != end_template['Resources'][r]:
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errors.append('Resource %s from %s conflicts' % (r,
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template_path))
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continue
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if 'Resources' not in end_template:
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end_template['Resources'] = {}
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end_template['Resources'][r] = rbody
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end_template = apply_scaling(end_template, scaling)
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end_template = apply_maps(end_template)
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def fix_ref(item, old, new):
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if isinstance(item, dict):
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copy_item = dict(item)
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for k, v in sorted(copy_item.items()):
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if k == 'Ref' and v == old:
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item[k] = new
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continue
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if k == 'DependsOn' and v == old:
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item[k] = new
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continue
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if k == 'Fn::GetAtt' and isinstance(v, list) and v[0] == old:
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new_list = list(v)
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new_list[0] = new
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item[k] = new_list
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continue
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if k == 'AllowedResources' and isinstance(v, list) and old in v:
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while old in v:
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pos = v.index(old)
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v[pos] = new
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continue
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fix_ref(v, old, new)
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elif isinstance(item, list):
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copy_item = list(item)
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for v in item:
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fix_ref(v, old, new)
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for change in resource_changes:
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fix_ref(end_template, change[0], change[1])
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if errors:
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for e in errors:
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sys.stderr.write("ERROR: %s\n" % e)
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end_template['Description'] = ','.join(end_template['Description'])
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return yaml.safe_dump(end_template, default_flow_style=False)
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if __name__ == "__main__":
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main()
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